git.sesse.net Git - ffmpeg/blob - libavcodec/h264.c

   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... decoder
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * H.264 / AVC / MPEG4 part10 codec.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #define UNCHECKED_BITSTREAM_READER 1
  29
  30 #include "libavutil/imgutils.h"
  31 #include "libavutil/opt.h"
  32 #include "internal.h"
  33 #include "cabac.h"
  34 #include "cabac_functions.h"
  35 #include "dsputil.h"
  36 #include "avcodec.h"
  37 #include "mpegvideo.h"
  38 #include "h264.h"
  39 #include "h264data.h"
  40 #include "h264_mvpred.h"
  41 #include "golomb.h"
  42 #include "mathops.h"
  43 #include "rectangle.h"
  44 #include "thread.h"
  45 #include "vdpau_internal.h"
  46 #include "libavutil/avassert.h"
  47
  48 // #undef NDEBUG
  49 #include <assert.h>
  50
  51 const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
  52
  53 static const uint8_t rem6[QP_MAX_NUM + 1] = {
  54     0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
  55     3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
  56     0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
  57     3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
  58     0, 1, 2, 3,
  59 };
  60
  61 static const uint8_t div6[QP_MAX_NUM + 1] = {
  62     0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3,  3,  3,
  63     3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6,  6,  6,
  64     7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10,
  65    10,10,10,11,11,11,11,11,11,12,12,12,12,12,12,13,13,13, 13, 13, 13,
  66    14,14,14,14,
  67 };
  68
  69 static const enum AVPixelFormat hwaccel_pixfmt_list_h264_jpeg_420[] = {
  70     AV_PIX_FMT_DXVA2_VLD,
  71     AV_PIX_FMT_VAAPI_VLD,
  72     AV_PIX_FMT_VDA_VLD,
  73     AV_PIX_FMT_YUVJ420P,
  74     AV_PIX_FMT_NONE
  75 };
  76
  77 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx)
  78 {
  79     H264Context *h = avctx->priv_data;
  80     return h ? h->sps.num_reorder_frames : 0;
  81 }
  82
  83 /**
  84  * Check if the top & left blocks are available if needed and
  85  * change the dc mode so it only uses the available blocks.
  86  */
  87 int ff_h264_check_intra4x4_pred_mode(H264Context *h)
  88 {
  89     MpegEncContext *const s     = &h->s;
  90     static const int8_t top[12] = {
  91         -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
  92     };
  93     static const int8_t left[12] = {
  94         0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
  95     };
  96     int i;
  97
  98     if (!(h->top_samples_available & 0x8000)) {
  99         for (i = 0; i < 4; i++) {
 100             int status = top[h->intra4x4_pred_mode_cache[scan8[0] + i]];
 101             if (status < 0) {
 102                 av_log(h->s.avctx, AV_LOG_ERROR,
 103                        "top block unavailable for requested intra4x4 mode %d at %d %d\n",
 104                        status, s->mb_x, s->mb_y);
 105                 return -1;
 106             } else if (status) {
 107                 h->intra4x4_pred_mode_cache[scan8[0] + i] = status;
 108             }
 109         }
 110     }
 111
 112     if ((h->left_samples_available & 0x8888) != 0x8888) {
 113         static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
 114         for (i = 0; i < 4; i++)
 115             if (!(h->left_samples_available & mask[i])) {
 116                 int status = left[h->intra4x4_pred_mode_cache[scan8[0] + 8 * i]];
 117                 if (status < 0) {
 118                     av_log(h->s.avctx, AV_LOG_ERROR,
 119                            "left block unavailable for requested intra4x4 mode %d at %d %d\n",
 120                            status, s->mb_x, s->mb_y);
 121                     return -1;
 122                 } else if (status) {
 123                     h->intra4x4_pred_mode_cache[scan8[0] + 8 * i] = status;
 124                 }
 125             }
 126     }
 127
 128     return 0;
 129 } // FIXME cleanup like ff_h264_check_intra_pred_mode
 130
 131 /**
 132  * Check if the top & left blocks are available if needed and
 133  * change the dc mode so it only uses the available blocks.
 134  */
 135 int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma)
 136 {
 137     MpegEncContext *const s     = &h->s;
 138     static const int8_t top[7]  = { LEFT_DC_PRED8x8, 1, -1, -1 };
 139     static const int8_t left[7] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
 140
 141     if (mode > 6U) {
 142         av_log(h->s.avctx, AV_LOG_ERROR,
 143                "out of range intra chroma pred mode at %d %d\n",
 144                s->mb_x, s->mb_y);
 145         return -1;
 146     }
 147
 148     if (!(h->top_samples_available & 0x8000)) {
 149         mode = top[mode];
 150         if (mode < 0) {
 151             av_log(h->s.avctx, AV_LOG_ERROR,
 152                    "top block unavailable for requested intra mode at %d %d\n",
 153                    s->mb_x, s->mb_y);
 154             return -1;
 155         }
 156     }
 157
 158     if ((h->left_samples_available & 0x8080) != 0x8080) {
 159         mode = left[mode];
 160         if (is_chroma && (h->left_samples_available & 0x8080)) {
 161             // mad cow disease mode, aka MBAFF + constrained_intra_pred
 162             mode = ALZHEIMER_DC_L0T_PRED8x8 +
 163                    (!(h->left_samples_available & 0x8000)) +
 164                    2 * (mode == DC_128_PRED8x8);
 165         }
 166         if (mode < 0) {
 167             av_log(h->s.avctx, AV_LOG_ERROR,
 168                    "left block unavailable for requested intra mode at %d %d\n",
 169                    s->mb_x, s->mb_y);
 170             return -1;
 171         }
 172     }
 173
 174     return mode;
 175 }
 176
 177 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
 178                                   int *dst_length, int *consumed, int length)
 179 {
 180     int i, si, di;
 181     uint8_t *dst;
 182     int bufidx;
 183
 184     // src[0]&0x80; // forbidden bit
 185     h->nal_ref_idc   = src[0] >> 5;
 186     h->nal_unit_type = src[0] & 0x1F;
 187
 188     src++;
 189     length--;
 190
 191 #define STARTCODE_TEST                                                  \
 192         if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) {     \
 193             if (src[i + 2] != 3) {                                      \
 194                 /* startcode, so we must be past the end */             \
 195                 length = i;                                             \
 196             }                                                           \
 197             break;                                                      \
 198         }
 199 #if HAVE_FAST_UNALIGNED
 200 #define FIND_FIRST_ZERO                                                 \
 201         if (i > 0 && !src[i])                                           \
 202             i--;                                                        \
 203         while (src[i])                                                  \
 204             i++
 205 #if HAVE_FAST_64BIT
 206     for (i = 0; i + 1 < length; i += 9) {
 207         if (!((~AV_RN64A(src + i) &
 208                (AV_RN64A(src + i) - 0x0100010001000101ULL)) &
 209               0x8000800080008080ULL))
 210             continue;
 211         FIND_FIRST_ZERO;
 212         STARTCODE_TEST;
 213         i -= 7;
 214     }
 215 #else
 216     for (i = 0; i + 1 < length; i += 5) {
 217         if (!((~AV_RN32A(src + i) &
 218                (AV_RN32A(src + i) - 0x01000101U)) &
 219               0x80008080U))
 220             continue;
 221         FIND_FIRST_ZERO;
 222         STARTCODE_TEST;
 223         i -= 3;
 224     }
 225 #endif
 226 #else
 227     for (i = 0; i + 1 < length; i += 2) {
 228         if (src[i])
 229             continue;
 230         if (i > 0 && src[i - 1] == 0)
 231             i--;
 232         STARTCODE_TEST;
 233     }
 234 #endif
 235
 236     // use second escape buffer for inter data
 237     bufidx = h->nal_unit_type == NAL_DPC ? 1 : 0;
 238
 239     si = h->rbsp_buffer_size[bufidx];
 240     av_fast_padded_malloc(&h->rbsp_buffer[bufidx], &h->rbsp_buffer_size[bufidx], length+MAX_MBPAIR_SIZE);
 241     dst = h->rbsp_buffer[bufidx];
 242
 243     if (dst == NULL)
 244         return NULL;
 245
 246     if(i>=length-1){ //no escaped 0
 247         *dst_length= length;
 248         *consumed= length+1; //+1 for the header
 249         if(h->s.avctx->flags2 & CODEC_FLAG2_FAST){
 250             return src;
 251         }else{
 252             memcpy(dst, src, length);
 253             return dst;
 254         }
 255     }
 256
 257     memcpy(dst, src, i);
 258     si = di = i;
 259     while (si + 2 < length) {
 260         // remove escapes (very rare 1:2^22)
 261         if (src[si + 2] > 3) {
 262             dst[di++] = src[si++];
 263             dst[di++] = src[si++];
 264         } else if (src[si] == 0 && src[si + 1] == 0) {
 265             if (src[si + 2] == 3) { // escape
 266                 dst[di++]  = 0;
 267                 dst[di++]  = 0;
 268                 si        += 3;
 269                 continue;
 270             } else // next start code
 271                 goto nsc;
 272         }
 273
 274         dst[di++] = src[si++];
 275     }
 276     while (si < length)
 277         dst[di++] = src[si++];
 278 nsc:
 279
 280     memset(dst + di, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 281
 282     *dst_length = di;
 283     *consumed   = si + 1; // +1 for the header
 284     /* FIXME store exact number of bits in the getbitcontext
 285      * (it is needed for decoding) */
 286     return dst;
 287 }
 288
 289 /**
 290  * Identify the exact end of the bitstream
 291  * @return the length of the trailing, or 0 if damaged
 292  */
 293 static int decode_rbsp_trailing(H264Context *h, const uint8_t *src)
 294 {
 295     int v = *src;
 296     int r;
 297
 298     tprintf(h->s.avctx, "rbsp trailing %X\n", v);
 299
 300     for (r = 1; r < 9; r++) {
 301         if (v & 1)
 302             return r;
 303         v >>= 1;
 304     }
 305     return 0;
 306 }
 307
 308 static inline int get_lowest_part_list_y(H264Context *h, Picture *pic, int n,
 309                                          int height, int y_offset, int list)
 310 {
 311     int raw_my        = h->mv_cache[list][scan8[n]][1];
 312     int filter_height = (raw_my & 3) ? 2 : 0;
 313     int full_my       = (raw_my >> 2) + y_offset;
 314     int top           = full_my - filter_height;
 315     int bottom        = full_my + filter_height + height;
 316
 317     return FFMAX(abs(top), bottom);
 318 }
 319
 320 static inline void get_lowest_part_y(H264Context *h, int refs[2][48], int n,
 321                                      int height, int y_offset, int list0,
 322                                      int list1, int *nrefs)
 323 {
 324     MpegEncContext *const s = &h->s;
 325     int my;
 326
 327     y_offset += 16 * (s->mb_y >> MB_FIELD);
 328
 329     if (list0) {
 330         int ref_n    = h->ref_cache[0][scan8[n]];
 331         Picture *ref = &h->ref_list[0][ref_n];
 332
 333         // Error resilience puts the current picture in the ref list.
 334         // Don't try to wait on these as it will cause a deadlock.
 335         // Fields can wait on each other, though.
 336         if (ref->f.thread_opaque   != s->current_picture.f.thread_opaque ||
 337             (ref->f.reference & 3) != s->picture_structure) {
 338             my = get_lowest_part_list_y(h, ref, n, height, y_offset, 0);
 339             if (refs[0][ref_n] < 0)
 340                 nrefs[0] += 1;
 341             refs[0][ref_n] = FFMAX(refs[0][ref_n], my);
 342         }
 343     }
 344
 345     if (list1) {
 346         int ref_n    = h->ref_cache[1][scan8[n]];
 347         Picture *ref = &h->ref_list[1][ref_n];
 348
 349         if (ref->f.thread_opaque   != s->current_picture.f.thread_opaque ||
 350             (ref->f.reference & 3) != s->picture_structure) {
 351             my = get_lowest_part_list_y(h, ref, n, height, y_offset, 1);
 352             if (refs[1][ref_n] < 0)
 353                 nrefs[1] += 1;
 354             refs[1][ref_n] = FFMAX(refs[1][ref_n], my);
 355         }
 356     }
 357 }
 358
 359 /**
 360  * Wait until all reference frames are available for MC operations.
 361  *
 362  * @param h the H264 context
 363  */
 364 static void await_references(H264Context *h)
 365 {
 366     MpegEncContext *const s = &h->s;
 367     const int mb_xy   = h->mb_xy;
 368     const int mb_type = s->current_picture.f.mb_type[mb_xy];
 369     int refs[2][48];
 370     int nrefs[2] = { 0 };
 371     int ref, list;
 372
 373     memset(refs, -1, sizeof(refs));
 374
 375     if (IS_16X16(mb_type)) {
 376         get_lowest_part_y(h, refs, 0, 16, 0,
 377                           IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
 378     } else if (IS_16X8(mb_type)) {
 379         get_lowest_part_y(h, refs, 0, 8, 0,
 380                           IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
 381         get_lowest_part_y(h, refs, 8, 8, 8,
 382                           IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
 383     } else if (IS_8X16(mb_type)) {
 384         get_lowest_part_y(h, refs, 0, 16, 0,
 385                           IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
 386         get_lowest_part_y(h, refs, 4, 16, 0,
 387                           IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
 388     } else {
 389         int i;
 390
 391         av_assert2(IS_8X8(mb_type));
 392
 393         for (i = 0; i < 4; i++) {
 394             const int sub_mb_type = h->sub_mb_type[i];
 395             const int n           = 4 * i;
 396             int y_offset          = (i & 2) << 2;
 397
 398             if (IS_SUB_8X8(sub_mb_type)) {
 399                 get_lowest_part_y(h, refs, n, 8, y_offset,
 400                                   IS_DIR(sub_mb_type, 0, 0),
 401                                   IS_DIR(sub_mb_type, 0, 1),
 402                                   nrefs);
 403             } else if (IS_SUB_8X4(sub_mb_type)) {
 404                 get_lowest_part_y(h, refs, n, 4, y_offset,
 405                                   IS_DIR(sub_mb_type, 0, 0),
 406                                   IS_DIR(sub_mb_type, 0, 1),
 407                                   nrefs);
 408                 get_lowest_part_y(h, refs, n + 2, 4, y_offset + 4,
 409                                   IS_DIR(sub_mb_type, 0, 0),
 410                                   IS_DIR(sub_mb_type, 0, 1),
 411                                   nrefs);
 412             } else if (IS_SUB_4X8(sub_mb_type)) {
 413                 get_lowest_part_y(h, refs, n, 8, y_offset,
 414                                   IS_DIR(sub_mb_type, 0, 0),
 415                                   IS_DIR(sub_mb_type, 0, 1),
 416                                   nrefs);
 417                 get_lowest_part_y(h, refs, n + 1, 8, y_offset,
 418                                   IS_DIR(sub_mb_type, 0, 0),
 419                                   IS_DIR(sub_mb_type, 0, 1),
 420                                   nrefs);
 421             } else {
 422                 int j;
 423                 av_assert2(IS_SUB_4X4(sub_mb_type));
 424                 for (j = 0; j < 4; j++) {
 425                     int sub_y_offset = y_offset + 2 * (j & 2);
 426                     get_lowest_part_y(h, refs, n + j, 4, sub_y_offset,
 427                                       IS_DIR(sub_mb_type, 0, 0),
 428                                       IS_DIR(sub_mb_type, 0, 1),
 429                                       nrefs);
 430                 }
 431             }
 432         }
 433     }
 434
 435     for (list = h->list_count - 1; list >= 0; list--)
 436         for (ref = 0; ref < 48 && nrefs[list]; ref++) {
 437             int row = refs[list][ref];
 438             if (row >= 0) {
 439                 Picture *ref_pic      = &h->ref_list[list][ref];
 440                 int ref_field         = ref_pic->f.reference - 1;
 441                 int ref_field_picture = ref_pic->field_picture;
 442                 int pic_height        = 16 * s->mb_height >> ref_field_picture;
 443
 444                 row <<= MB_MBAFF;
 445                 nrefs[list]--;
 446
 447                 if (!FIELD_PICTURE && ref_field_picture) { // frame referencing two fields
 448                     ff_thread_await_progress(&ref_pic->f,
 449                                              FFMIN((row >> 1) - !(row & 1),
 450                                                    pic_height - 1),
 451                                              1);
 452                     ff_thread_await_progress(&ref_pic->f,
 453                                              FFMIN((row >> 1), pic_height - 1),
 454                                              0);
 455                 } else if (FIELD_PICTURE && !ref_field_picture) { // field referencing one field of a frame
 456                     ff_thread_await_progress(&ref_pic->f,
 457                                              FFMIN(row * 2 + ref_field,
 458                                                    pic_height - 1),
 459                                              0);
 460                 } else if (FIELD_PICTURE) {
 461                     ff_thread_await_progress(&ref_pic->f,
 462                                              FFMIN(row, pic_height - 1),
 463                                              ref_field);
 464                 } else {
 465                     ff_thread_await_progress(&ref_pic->f,
 466                                              FFMIN(row, pic_height - 1),
 467                                              0);
 468                 }
 469             }
 470         }
 471 }
 472
 473 static av_always_inline void mc_dir_part(H264Context *h, Picture *pic,
 474                                          int n, int square, int height,
 475                                          int delta, int list,
 476                                          uint8_t *dest_y, uint8_t *dest_cb,
 477                                          uint8_t *dest_cr,
 478                                          int src_x_offset, int src_y_offset,
 479                                          qpel_mc_func *qpix_op,
 480                                          h264_chroma_mc_func chroma_op,
 481                                          int pixel_shift, int chroma_idc)
 482 {
 483     MpegEncContext *const s = &h->s;
 484     const int mx      = h->mv_cache[list][scan8[n]][0] + src_x_offset * 8;
 485     int my            = h->mv_cache[list][scan8[n]][1] + src_y_offset * 8;
 486     const int luma_xy = (mx & 3) + ((my & 3) << 2);
 487     int offset        = ((mx >> 2) << pixel_shift) + (my >> 2) * h->mb_linesize;
 488     uint8_t *src_y    = pic->f.data[0] + offset;
 489     uint8_t *src_cb, *src_cr;
 490     int extra_width  = h->emu_edge_width;
 491     int extra_height = h->emu_edge_height;
 492     int emu = 0;
 493     const int full_mx    = mx >> 2;
 494     const int full_my    = my >> 2;
 495     const int pic_width  = 16 * s->mb_width;
 496     const int pic_height = 16 * s->mb_height >> MB_FIELD;
 497     int ysh;
 498
 499     if (mx & 7)
 500         extra_width -= 3;
 501     if (my & 7)
 502         extra_height -= 3;
 503
 504     if (full_mx                <          0 - extra_width  ||
 505         full_my                <          0 - extra_height ||
 506         full_mx + 16 /*FIXME*/ > pic_width  + extra_width  ||
 507         full_my + 16 /*FIXME*/ > pic_height + extra_height) {
 508         s->dsp.emulated_edge_mc(s->edge_emu_buffer,
 509                                 src_y - (2 << pixel_shift) - 2 * h->mb_linesize,
 510                                 h->mb_linesize,
 511                                 16 + 5, 16 + 5 /*FIXME*/, full_mx - 2,
 512                                 full_my - 2, pic_width, pic_height);
 513         src_y = s->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
 514         emu   = 1;
 515     }
 516
 517     qpix_op[luma_xy](dest_y, src_y, h->mb_linesize); // FIXME try variable height perhaps?
 518     if (!square)
 519         qpix_op[luma_xy](dest_y + delta, src_y + delta, h->mb_linesize);
 520
 521     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY)
 522         return;
 523
 524     if (chroma_idc == 3 /* yuv444 */) {
 525         src_cb = pic->f.data[1] + offset;
 526         if (emu) {
 527             s->dsp.emulated_edge_mc(s->edge_emu_buffer,
 528                                     src_cb - (2 << pixel_shift) - 2 * h->mb_linesize,
 529                                     h->mb_linesize,
 530                                     16 + 5, 16 + 5 /*FIXME*/,
 531                                     full_mx - 2, full_my - 2,
 532                                     pic_width, pic_height);
 533             src_cb = s->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
 534         }
 535         qpix_op[luma_xy](dest_cb, src_cb, h->mb_linesize); // FIXME try variable height perhaps?
 536         if (!square)
 537             qpix_op[luma_xy](dest_cb + delta, src_cb + delta, h->mb_linesize);
 538
 539         src_cr = pic->f.data[2] + offset;
 540         if (emu) {
 541             s->dsp.emulated_edge_mc(s->edge_emu_buffer,
 542                                     src_cr - (2 << pixel_shift) - 2 * h->mb_linesize,
 543                                     h->mb_linesize,
 544                                     16 + 5, 16 + 5 /*FIXME*/,
 545                                     full_mx - 2, full_my - 2,
 546                                     pic_width, pic_height);
 547             src_cr = s->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
 548         }
 549         qpix_op[luma_xy](dest_cr, src_cr, h->mb_linesize); // FIXME try variable height perhaps?
 550         if (!square)
 551             qpix_op[luma_xy](dest_cr + delta, src_cr + delta, h->mb_linesize);
 552         return;
 553     }
 554
 555     ysh = 3 - (chroma_idc == 2 /* yuv422 */);
 556     if (chroma_idc == 1 /* yuv420 */ && MB_FIELD) {
 557         // chroma offset when predicting from a field of opposite parity
 558         my  += 2 * ((s->mb_y & 1) - (pic->f.reference - 1));
 559         emu |= (my >> 3) < 0 || (my >> 3) + 8 >= (pic_height >> 1);
 560     }
 561
 562     src_cb = pic->f.data[1] + ((mx >> 3) << pixel_shift) +
 563              (my >> ysh) * h->mb_uvlinesize;
 564     src_cr = pic->f.data[2] + ((mx >> 3) << pixel_shift) +
 565              (my >> ysh) * h->mb_uvlinesize;
 566
 567     if (emu) {
 568         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cb, h->mb_uvlinesize,
 569                                 9, 8 * chroma_idc + 1, (mx >> 3), (my >> ysh),
 570                                 pic_width >> 1, pic_height >> (chroma_idc == 1 /* yuv420 */));
 571         src_cb = s->edge_emu_buffer;
 572     }
 573     chroma_op(dest_cb, src_cb, h->mb_uvlinesize,
 574               height >> (chroma_idc == 1 /* yuv420 */),
 575               mx & 7, (my << (chroma_idc == 2 /* yuv422 */)) & 7);
 576
 577     if (emu) {
 578         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cr, h->mb_uvlinesize,
 579                                 9, 8 * chroma_idc + 1, (mx >> 3), (my >> ysh),
 580                                 pic_width >> 1, pic_height >> (chroma_idc == 1 /* yuv420 */));
 581         src_cr = s->edge_emu_buffer;
 582     }
 583     chroma_op(dest_cr, src_cr, h->mb_uvlinesize, height >> (chroma_idc == 1 /* yuv420 */),
 584               mx & 7, (my << (chroma_idc == 2 /* yuv422 */)) & 7);
 585 }
 586
 587 static av_always_inline void mc_part_std(H264Context *h, int n, int square,
 588                                          int height, int delta,
 589                                          uint8_t *dest_y, uint8_t *dest_cb,
 590                                          uint8_t *dest_cr,
 591                                          int x_offset, int y_offset,
 592                                          qpel_mc_func *qpix_put,
 593                                          h264_chroma_mc_func chroma_put,
 594                                          qpel_mc_func *qpix_avg,
 595                                          h264_chroma_mc_func chroma_avg,
 596                                          int list0, int list1,
 597                                          int pixel_shift, int chroma_idc)
 598 {
 599     MpegEncContext *const s       = &h->s;
 600     qpel_mc_func *qpix_op         = qpix_put;
 601     h264_chroma_mc_func chroma_op = chroma_put;
 602
 603     dest_y += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 604     if (chroma_idc == 3 /* yuv444 */) {
 605         dest_cb += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 606         dest_cr += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 607     } else if (chroma_idc == 2 /* yuv422 */) {
 608         dest_cb += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
 609         dest_cr += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
 610     } else { /* yuv420 */
 611         dest_cb += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
 612         dest_cr += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
 613     }
 614     x_offset += 8 * s->mb_x;
 615     y_offset += 8 * (s->mb_y >> MB_FIELD);
 616
 617     if (list0) {
 618         Picture *ref = &h->ref_list[0][h->ref_cache[0][scan8[n]]];
 619         mc_dir_part(h, ref, n, square, height, delta, 0,
 620                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
 621                     qpix_op, chroma_op, pixel_shift, chroma_idc);
 622
 623         qpix_op   = qpix_avg;
 624         chroma_op = chroma_avg;
 625     }
 626
 627     if (list1) {
 628         Picture *ref = &h->ref_list[1][h->ref_cache[1][scan8[n]]];
 629         mc_dir_part(h, ref, n, square, height, delta, 1,
 630                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
 631                     qpix_op, chroma_op, pixel_shift, chroma_idc);
 632     }
 633 }
 634
 635 static av_always_inline void mc_part_weighted(H264Context *h, int n, int square,
 636                                               int height, int delta,
 637                                               uint8_t *dest_y, uint8_t *dest_cb,
 638                                               uint8_t *dest_cr,
 639                                               int x_offset, int y_offset,
 640                                               qpel_mc_func *qpix_put,
 641                                               h264_chroma_mc_func chroma_put,
 642                                               h264_weight_func luma_weight_op,
 643                                               h264_weight_func chroma_weight_op,
 644                                               h264_biweight_func luma_weight_avg,
 645                                               h264_biweight_func chroma_weight_avg,
 646                                               int list0, int list1,
 647                                               int pixel_shift, int chroma_idc)
 648 {
 649     MpegEncContext *const s = &h->s;
 650     int chroma_height;
 651
 652     dest_y += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 653     if (chroma_idc == 3 /* yuv444 */) {
 654         chroma_height     = height;
 655         chroma_weight_avg = luma_weight_avg;
 656         chroma_weight_op  = luma_weight_op;
 657         dest_cb += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 658         dest_cr += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
 659     } else if (chroma_idc == 2 /* yuv422 */) {
 660         chroma_height = height;
 661         dest_cb      += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
 662         dest_cr      += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
 663     } else { /* yuv420 */
 664         chroma_height = height >> 1;
 665         dest_cb      += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
 666         dest_cr      += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
 667     }
 668     x_offset += 8 * s->mb_x;
 669     y_offset += 8 * (s->mb_y >> MB_FIELD);
 670
 671     if (list0 && list1) {
 672         /* don't optimize for luma-only case, since B-frames usually
 673          * use implicit weights => chroma too. */
 674         uint8_t *tmp_cb = s->obmc_scratchpad;
 675         uint8_t *tmp_cr = s->obmc_scratchpad + (16 << pixel_shift);
 676         uint8_t *tmp_y  = s->obmc_scratchpad + 16 * h->mb_uvlinesize;
 677         int refn0       = h->ref_cache[0][scan8[n]];
 678         int refn1       = h->ref_cache[1][scan8[n]];
 679
 680         mc_dir_part(h, &h->ref_list[0][refn0], n, square, height, delta, 0,
 681                     dest_y, dest_cb, dest_cr,
 682                     x_offset, y_offset, qpix_put, chroma_put,
 683                     pixel_shift, chroma_idc);
 684         mc_dir_part(h, &h->ref_list[1][refn1], n, square, height, delta, 1,
 685                     tmp_y, tmp_cb, tmp_cr,
 686                     x_offset, y_offset, qpix_put, chroma_put,
 687                     pixel_shift, chroma_idc);
 688
 689         if (h->use_weight == 2) {
 690             int weight0 = h->implicit_weight[refn0][refn1][s->mb_y & 1];
 691             int weight1 = 64 - weight0;
 692             luma_weight_avg(dest_y, tmp_y, h->mb_linesize,
 693                             height, 5, weight0, weight1, 0);
 694             chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize,
 695                               chroma_height, 5, weight0, weight1, 0);
 696             chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize,
 697                               chroma_height, 5, weight0, weight1, 0);
 698         } else {
 699             luma_weight_avg(dest_y, tmp_y, h->mb_linesize, height,
 700                             h->luma_log2_weight_denom,
 701                             h->luma_weight[refn0][0][0],
 702                             h->luma_weight[refn1][1][0],
 703                             h->luma_weight[refn0][0][1] +
 704                             h->luma_weight[refn1][1][1]);
 705             chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize, chroma_height,
 706                               h->chroma_log2_weight_denom,
 707                               h->chroma_weight[refn0][0][0][0],
 708                               h->chroma_weight[refn1][1][0][0],
 709                               h->chroma_weight[refn0][0][0][1] +
 710                               h->chroma_weight[refn1][1][0][1]);
 711             chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize, chroma_height,
 712                               h->chroma_log2_weight_denom,
 713                               h->chroma_weight[refn0][0][1][0],
 714                               h->chroma_weight[refn1][1][1][0],
 715                               h->chroma_weight[refn0][0][1][1] +
 716                               h->chroma_weight[refn1][1][1][1]);
 717         }
 718     } else {
 719         int list     = list1 ? 1 : 0;
 720         int refn     = h->ref_cache[list][scan8[n]];
 721         Picture *ref = &h->ref_list[list][refn];
 722         mc_dir_part(h, ref, n, square, height, delta, list,
 723                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
 724                     qpix_put, chroma_put, pixel_shift, chroma_idc);
 725
 726         luma_weight_op(dest_y, h->mb_linesize, height,
 727                        h->luma_log2_weight_denom,
 728                        h->luma_weight[refn][list][0],
 729                        h->luma_weight[refn][list][1]);
 730         if (h->use_weight_chroma) {
 731             chroma_weight_op(dest_cb, h->mb_uvlinesize, chroma_height,
 732                              h->chroma_log2_weight_denom,
 733                              h->chroma_weight[refn][list][0][0],
 734                              h->chroma_weight[refn][list][0][1]);
 735             chroma_weight_op(dest_cr, h->mb_uvlinesize, chroma_height,
 736                              h->chroma_log2_weight_denom,
 737                              h->chroma_weight[refn][list][1][0],
 738                              h->chroma_weight[refn][list][1][1]);
 739         }
 740     }
 741 }
 742
 743 static av_always_inline void prefetch_motion(H264Context *h, int list,
 744                                              int pixel_shift, int chroma_idc)
 745 {
 746     /* fetch pixels for estimated mv 4 macroblocks ahead
 747      * optimized for 64byte cache lines */
 748     MpegEncContext *const s = &h->s;
 749     const int refn = h->ref_cache[list][scan8[0]];
 750     if (refn >= 0) {
 751         const int mx  = (h->mv_cache[list][scan8[0]][0] >> 2) + 16 * s->mb_x + 8;
 752         const int my  = (h->mv_cache[list][scan8[0]][1] >> 2) + 16 * s->mb_y;
 753         uint8_t **src = h->ref_list[list][refn].f.data;
 754         int off       = (mx << pixel_shift) +
 755                         (my + (s->mb_x & 3) * 4) * h->mb_linesize +
 756                         (64 << pixel_shift);
 757         s->dsp.prefetch(src[0] + off, s->linesize, 4);
 758         if (chroma_idc == 3 /* yuv444 */) {
 759             s->dsp.prefetch(src[1] + off, s->linesize, 4);
 760             s->dsp.prefetch(src[2] + off, s->linesize, 4);
 761         } else {
 762             off= (((mx>>1)+64)<<pixel_shift) + ((my>>1) + (s->mb_x&7))*s->uvlinesize;
 763             s->dsp.prefetch(src[1] + off, src[2] - src[1], 2);
 764         }
 765     }
 766 }
 767
 768 static void free_tables(H264Context *h, int free_rbsp)
 769 {
 770     int i;
 771     H264Context *hx;
 772
 773     av_freep(&h->intra4x4_pred_mode);
 774     av_freep(&h->chroma_pred_mode_table);
 775     av_freep(&h->cbp_table);
 776     av_freep(&h->mvd_table[0]);
 777     av_freep(&h->mvd_table[1]);
 778     av_freep(&h->direct_table);
 779     av_freep(&h->non_zero_count);
 780     av_freep(&h->slice_table_base);
 781     h->slice_table = NULL;
 782     av_freep(&h->list_counts);
 783
 784     av_freep(&h->mb2b_xy);
 785     av_freep(&h->mb2br_xy);
 786
 787     for (i = 0; i < MAX_THREADS; i++) {
 788         hx = h->thread_context[i];
 789         if (!hx)
 790             continue;
 791         av_freep(&hx->top_borders[1]);
 792         av_freep(&hx->top_borders[0]);
 793         av_freep(&hx->s.obmc_scratchpad);
 794         if (free_rbsp) {
 795             av_freep(&hx->rbsp_buffer[1]);
 796             av_freep(&hx->rbsp_buffer[0]);
 797             hx->rbsp_buffer_size[0] = 0;
 798             hx->rbsp_buffer_size[1] = 0;
 799         }
 800         if (i)
 801             av_freep(&h->thread_context[i]);
 802     }
 803 }
 804
 805 static void init_dequant8_coeff_table(H264Context *h)
 806 {
 807     int i, j, q, x;
 808     const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);
 809
 810     for (i = 0; i < 6; i++) {
 811         h->dequant8_coeff[i] = h->dequant8_buffer[i];
 812         for (j = 0; j < i; j++)
 813             if (!memcmp(h->pps.scaling_matrix8[j], h->pps.scaling_matrix8[i],
 814                         64 * sizeof(uint8_t))) {
 815                 h->dequant8_coeff[i] = h->dequant8_buffer[j];
 816                 break;
 817             }
 818         if (j < i)
 819             continue;
 820
 821         for (q = 0; q < max_qp + 1; q++) {
 822             int shift = div6[q];
 823             int idx   = rem6[q];
 824             for (x = 0; x < 64; x++)
 825                 h->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
 826                     ((uint32_t)dequant8_coeff_init[idx][dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
 827                      h->pps.scaling_matrix8[i][x]) << shift;
 828         }
 829     }
 830 }
 831
 832 static void init_dequant4_coeff_table(H264Context *h)
 833 {
 834     int i, j, q, x;
 835     const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);
 836     for (i = 0; i < 6; i++) {
 837         h->dequant4_coeff[i] = h->dequant4_buffer[i];
 838         for (j = 0; j < i; j++)
 839             if (!memcmp(h->pps.scaling_matrix4[j], h->pps.scaling_matrix4[i],
 840                         16 * sizeof(uint8_t))) {
 841                 h->dequant4_coeff[i] = h->dequant4_buffer[j];
 842                 break;
 843             }
 844         if (j < i)
 845             continue;
 846
 847         for (q = 0; q < max_qp + 1; q++) {
 848             int shift = div6[q] + 2;
 849             int idx   = rem6[q];
 850             for (x = 0; x < 16; x++)
 851                 h->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
 852                     ((uint32_t)dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
 853                      h->pps.scaling_matrix4[i][x]) << shift;
 854         }
 855     }
 856 }
 857
 858 static void init_dequant_tables(H264Context *h)
 859 {
 860     int i, x;
 861     init_dequant4_coeff_table(h);
 862     if (h->pps.transform_8x8_mode)
 863         init_dequant8_coeff_table(h);
 864     if (h->sps.transform_bypass) {
 865         for (i = 0; i < 6; i++)
 866             for (x = 0; x < 16; x++)
 867                 h->dequant4_coeff[i][0][x] = 1 << 6;
 868         if (h->pps.transform_8x8_mode)
 869             for (i = 0; i < 6; i++)
 870                 for (x = 0; x < 64; x++)
 871                     h->dequant8_coeff[i][0][x] = 1 << 6;
 872     }
 873 }
 874
 875 int ff_h264_alloc_tables(H264Context *h)
 876 {
 877     MpegEncContext *const s = &h->s;
 878     const int big_mb_num    = s->mb_stride * (s->mb_height + 1);
 879     const int row_mb_num    = 2*s->mb_stride*FFMAX(s->avctx->thread_count, 1);
 880     int x, y;
 881
 882     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->intra4x4_pred_mode,
 883                       row_mb_num * 8 * sizeof(uint8_t), fail)
 884     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->non_zero_count,
 885                       big_mb_num * 48 * sizeof(uint8_t), fail)
 886     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->slice_table_base,
 887                       (big_mb_num + s->mb_stride) * sizeof(*h->slice_table_base), fail)
 888     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->cbp_table,
 889                       big_mb_num * sizeof(uint16_t), fail)
 890     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->chroma_pred_mode_table,
 891                       big_mb_num * sizeof(uint8_t), fail)
 892     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mvd_table[0],
 893                       16 * row_mb_num * sizeof(uint8_t), fail);
 894     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mvd_table[1],
 895                       16 * row_mb_num * sizeof(uint8_t), fail);
 896     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->direct_table,
 897                       4 * big_mb_num * sizeof(uint8_t), fail);
 898     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->list_counts,
 899                       big_mb_num * sizeof(uint8_t), fail)
 900
 901     memset(h->slice_table_base, -1,
 902            (big_mb_num + s->mb_stride) * sizeof(*h->slice_table_base));
 903     h->slice_table = h->slice_table_base + s->mb_stride * 2 + 1;
 904
 905     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2b_xy,
 906                       big_mb_num * sizeof(uint32_t), fail);
 907     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2br_xy,
 908                       big_mb_num * sizeof(uint32_t), fail);
 909     for (y = 0; y < s->mb_height; y++)
 910         for (x = 0; x < s->mb_width; x++) {
 911             const int mb_xy = x + y * s->mb_stride;
 912             const int b_xy  = 4 * x + 4 * y * h->b_stride;
 913
 914             h->mb2b_xy[mb_xy]  = b_xy;
 915             h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * s->mb_stride)));
 916         }
 917
 918     s->obmc_scratchpad = NULL;
 919
 920     if (!h->dequant4_coeff[0])
 921         init_dequant_tables(h);
 922
 923     return 0;
 924
 925 fail:
 926     free_tables(h, 1);
 927     return -1;
 928 }
 929
 930 /**
 931  * Mimic alloc_tables(), but for every context thread.
 932  */
 933 static void clone_tables(H264Context *dst, H264Context *src, int i)
 934 {
 935     MpegEncContext *const s     = &src->s;
 936     dst->intra4x4_pred_mode     = src->intra4x4_pred_mode + i * 8 * 2 * s->mb_stride;
 937     dst->non_zero_count         = src->non_zero_count;
 938     dst->slice_table            = src->slice_table;
 939     dst->cbp_table              = src->cbp_table;
 940     dst->mb2b_xy                = src->mb2b_xy;
 941     dst->mb2br_xy               = src->mb2br_xy;
 942     dst->chroma_pred_mode_table = src->chroma_pred_mode_table;
 943     dst->mvd_table[0]           = src->mvd_table[0] + i * 8 * 2 * s->mb_stride;
 944     dst->mvd_table[1]           = src->mvd_table[1] + i * 8 * 2 * s->mb_stride;
 945     dst->direct_table           = src->direct_table;
 946     dst->list_counts            = src->list_counts;
 947     dst->s.obmc_scratchpad      = NULL;
 948     ff_h264_pred_init(&dst->hpc, src->s.codec_id, src->sps.bit_depth_luma,
 949                       src->sps.chroma_format_idc);
 950 }
 951
 952 /**
 953  * Init context
 954  * Allocate buffers which are not shared amongst multiple threads.
 955  */
 956 static int context_init(H264Context *h)
 957 {
 958     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->top_borders[0],
 959                       h->s.mb_width * 16 * 3 * sizeof(uint8_t) * 2, fail)
 960     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->top_borders[1],
 961                       h->s.mb_width * 16 * 3 * sizeof(uint8_t) * 2, fail)
 962
 963     h->ref_cache[0][scan8[5]  + 1] =
 964     h->ref_cache[0][scan8[7]  + 1] =
 965     h->ref_cache[0][scan8[13] + 1] =
 966     h->ref_cache[1][scan8[5]  + 1] =
 967     h->ref_cache[1][scan8[7]  + 1] =
 968     h->ref_cache[1][scan8[13] + 1] = PART_NOT_AVAILABLE;
 969
 970     return 0;
 971
 972 fail:
 973     return -1; // free_tables will clean up for us
 974 }
 975
 976 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size);
 977
 978 static av_cold void common_init(H264Context *h)
 979 {
 980     MpegEncContext *const s = &h->s;
 981
 982     s->width    = s->avctx->width;
 983     s->height   = s->avctx->height;
 984     s->codec_id = s->avctx->codec->id;
 985
 986     s->avctx->bits_per_raw_sample = 8;
 987     h->cur_chroma_format_idc = 1;
 988
 989     ff_h264dsp_init(&h->h264dsp,
 990                     s->avctx->bits_per_raw_sample, h->cur_chroma_format_idc);
 991     ff_h264_pred_init(&h->hpc, s->codec_id,
 992                       s->avctx->bits_per_raw_sample, h->cur_chroma_format_idc);
 993
 994     h->dequant_coeff_pps = -1;
 995     s->unrestricted_mv   = 1;
 996
 997     s->dsp.dct_bits = 16;
 998     /* needed so that IDCT permutation is known early */
 999     ff_dsputil_init(&s->dsp, s->avctx);
1000
1001     memset(h->pps.scaling_matrix4, 16, 6 * 16 * sizeof(uint8_t));
1002     memset(h->pps.scaling_matrix8, 16, 2 * 64 * sizeof(uint8_t));
1003 }
1004
1005 static int ff_h264_decode_extradata_internal(H264Context *h, const uint8_t *buf, int size)
1006 {
1007     AVCodecContext *avctx = h->s.avctx;
1008
1009     if (!buf || size <= 0)
1010         return -1;
1011
1012     if (buf[0] == 1) {
1013         int i, cnt, nalsize;
1014         const unsigned char *p = buf;
1015
1016         h->is_avc = 1;
1017
1018         if (size < 7) {
1019             av_log(avctx, AV_LOG_ERROR, "avcC too short\n");
1020             return -1;
1021         }
1022         /* sps and pps in the avcC always have length coded with 2 bytes,
1023          * so put a fake nal_length_size = 2 while parsing them */
1024         h->nal_length_size = 2;
1025         // Decode sps from avcC
1026         cnt = *(p + 5) & 0x1f; // Number of sps
1027         p  += 6;
1028         for (i = 0; i < cnt; i++) {
1029             nalsize = AV_RB16(p) + 2;
1030             if(nalsize > size - (p-buf))
1031                 return -1;
1032             if (decode_nal_units(h, p, nalsize) < 0) {
1033                 av_log(avctx, AV_LOG_ERROR,
1034                        "Decoding sps %d from avcC failed\n", i);
1035                 return -1;
1036             }
1037             p += nalsize;
1038         }
1039         // Decode pps from avcC
1040         cnt = *(p++); // Number of pps
1041         for (i = 0; i < cnt; i++) {
1042             nalsize = AV_RB16(p) + 2;
1043             if(nalsize > size - (p-buf))
1044                 return -1;
1045             if (decode_nal_units(h, p, nalsize) < 0) {
1046                 av_log(avctx, AV_LOG_ERROR,
1047                        "Decoding pps %d from avcC failed\n", i);
1048                 return -1;
1049             }
1050             p += nalsize;
1051         }
1052         // Now store right nal length size, that will be used to parse all other nals
1053         h->nal_length_size = (buf[4] & 0x03) + 1;
1054     } else {
1055         h->is_avc = 0;
1056         if (decode_nal_units(h, buf, size) < 0)
1057             return -1;
1058     }
1059     return size;
1060 }
1061
1062 int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)
1063 {
1064     int ret;
1065     h->decoding_extradata = 1;
1066     ret = ff_h264_decode_extradata_internal(h, buf, size);
1067     h->decoding_extradata = 0;
1068     return ret;
1069 }
1070
1071 av_cold int ff_h264_decode_init(AVCodecContext *avctx)
1072 {
1073     H264Context *h = avctx->priv_data;
1074     MpegEncContext *const s = &h->s;
1075     int i;
1076
1077     ff_MPV_decode_defaults(s);
1078
1079     s->avctx = avctx;
1080     common_init(h);
1081
1082     s->out_format      = FMT_H264;
1083     s->workaround_bugs = avctx->workaround_bugs;
1084
1085     /* set defaults */
1086     // s->decode_mb = ff_h263_decode_mb;
1087     s->quarter_sample = 1;
1088     if (!avctx->has_b_frames)
1089         s->low_delay = 1;
1090
1091     avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1092
1093     ff_h264_decode_init_vlc();
1094
1095     h->pixel_shift = 0;
1096     h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8;
1097
1098     h->thread_context[0] = h;
1099     h->outputed_poc      = h->next_outputed_poc = INT_MIN;
1100     for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
1101         h->last_pocs[i] = INT_MIN;
1102     h->prev_poc_msb = 1 << 16;
1103     h->prev_frame_num = -1;
1104     h->x264_build   = -1;
1105     ff_h264_reset_sei(h);
1106     if (avctx->codec_id == AV_CODEC_ID_H264) {
1107         if (avctx->ticks_per_frame == 1) {
1108             if(s->avctx->time_base.den < INT_MAX/2) {
1109                 s->avctx->time_base.den *= 2;
1110             } else
1111                 s->avctx->time_base.num /= 2;
1112         }
1113         avctx->ticks_per_frame = 2;
1114     }
1115
1116     if (avctx->extradata_size > 0 && avctx->extradata &&
1117         ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size) < 0) {
1118         ff_h264_free_context(h);
1119         return -1;
1120     }
1121
1122     if (h->sps.bitstream_restriction_flag &&
1123         s->avctx->has_b_frames < h->sps.num_reorder_frames) {
1124         s->avctx->has_b_frames = h->sps.num_reorder_frames;
1125         s->low_delay           = 0;
1126     }
1127
1128     ff_init_cabac_states();
1129
1130     return 0;
1131 }
1132
1133 #define IN_RANGE(a, b, size) (((a) >= (b)) && ((a) < ((b) + (size))))
1134
1135 static void copy_picture_range(Picture **to, Picture **from, int count,
1136                                MpegEncContext *new_base,
1137                                MpegEncContext *old_base)
1138 {
1139     int i;
1140
1141     for (i = 0; i < count; i++) {
1142         assert((IN_RANGE(from[i], old_base, sizeof(*old_base)) ||
1143                 IN_RANGE(from[i], old_base->picture,
1144                          sizeof(Picture) * old_base->picture_count) ||
1145                 !from[i]));
1146         to[i] = REBASE_PICTURE(from[i], new_base, old_base);
1147     }
1148 }
1149
1150 static void copy_parameter_set(void **to, void **from, int count, int size)
1151 {
1152     int i;
1153
1154     for (i = 0; i < count; i++) {
1155         if (to[i] && !from[i])
1156             av_freep(&to[i]);
1157         else if (from[i] && !to[i])
1158             to[i] = av_malloc(size);
1159
1160         if (from[i])
1161             memcpy(to[i], from[i], size);
1162     }
1163 }
1164
1165 static int decode_init_thread_copy(AVCodecContext *avctx)
1166 {
1167     H264Context *h = avctx->priv_data;
1168
1169     if (!avctx->internal->is_copy)
1170         return 0;
1171     memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
1172     memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
1173
1174     return 0;
1175 }
1176
1177 #define copy_fields(to, from, start_field, end_field)                   \
1178     memcpy(&to->start_field, &from->start_field,                        \
1179            (char *)&to->end_field - (char *)&to->start_field)
1180
1181 static int decode_update_thread_context(AVCodecContext *dst,
1182                                         const AVCodecContext *src)
1183 {
1184     H264Context *h = dst->priv_data, *h1 = src->priv_data;
1185     MpegEncContext *const s = &h->s, *const s1 = &h1->s;
1186     int inited = s->context_initialized, err;
1187     int i;
1188
1189     if (dst == src)
1190         return 0;
1191
1192     err = ff_mpeg_update_thread_context(dst, src);
1193     if (err)
1194         return err;
1195
1196     // FIXME handle width/height changing
1197     if (!inited) {
1198         for (i = 0; i < MAX_SPS_COUNT; i++)
1199             av_freep(h->sps_buffers + i);
1200
1201         for (i = 0; i < MAX_PPS_COUNT; i++)
1202             av_freep(h->pps_buffers + i);
1203
1204         // copy all fields after MpegEnc
1205         memcpy(&h->s + 1, &h1->s + 1,
1206                sizeof(H264Context) - sizeof(MpegEncContext));
1207         memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
1208         memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
1209
1210         if (s1->context_initialized) {
1211         if (ff_h264_alloc_tables(h) < 0) {
1212             av_log(dst, AV_LOG_ERROR, "Could not allocate memory for h264\n");
1213             return AVERROR(ENOMEM);
1214         }
1215         context_init(h);
1216
1217         /* frame_start may not be called for the next thread (if it's decoding
1218          * a bottom field) so this has to be allocated here */
1219         h->s.obmc_scratchpad = av_malloc(16 * 6 * s->linesize);
1220         }
1221
1222         for (i = 0; i < 2; i++) {
1223             h->rbsp_buffer[i]      = NULL;
1224             h->rbsp_buffer_size[i] = 0;
1225         }
1226
1227         h->thread_context[0] = h;
1228
1229         s->dsp.clear_blocks(h->mb);
1230         s->dsp.clear_blocks(h->mb + (24 * 16 << h->pixel_shift));
1231     }
1232
1233     // extradata/NAL handling
1234     h->is_avc = h1->is_avc;
1235
1236     // SPS/PPS
1237     copy_parameter_set((void **)h->sps_buffers, (void **)h1->sps_buffers,
1238                        MAX_SPS_COUNT, sizeof(SPS));
1239     h->sps = h1->sps;
1240     copy_parameter_set((void **)h->pps_buffers, (void **)h1->pps_buffers,
1241                        MAX_PPS_COUNT, sizeof(PPS));
1242     h->pps = h1->pps;
1243
1244     // Dequantization matrices
1245     // FIXME these are big - can they be only copied when PPS changes?
1246     copy_fields(h, h1, dequant4_buffer, dequant4_coeff);
1247
1248     for (i = 0; i < 6; i++)
1249         h->dequant4_coeff[i] = h->dequant4_buffer[0] +
1250                                (h1->dequant4_coeff[i] - h1->dequant4_buffer[0]);
1251
1252     for (i = 0; i < 6; i++)
1253         h->dequant8_coeff[i] = h->dequant8_buffer[0] +
1254                                (h1->dequant8_coeff[i] - h1->dequant8_buffer[0]);
1255
1256     h->dequant_coeff_pps = h1->dequant_coeff_pps;
1257
1258     // POC timing
1259     copy_fields(h, h1, poc_lsb, redundant_pic_count);
1260
1261     // reference lists
1262     copy_fields(h, h1, ref_count, list_count);
1263     copy_fields(h, h1, ref_list, intra_gb);
1264     copy_fields(h, h1, short_ref, cabac_init_idc);
1265
1266     copy_picture_range(h->short_ref, h1->short_ref, 32, s, s1);
1267     copy_picture_range(h->long_ref, h1->long_ref, 32, s, s1);
1268     copy_picture_range(h->delayed_pic, h1->delayed_pic,
1269                        MAX_DELAYED_PIC_COUNT + 2, s, s1);
1270
1271     h->last_slice_type = h1->last_slice_type;
1272     h->sync            = h1->sync;
1273
1274     if (!s->current_picture_ptr)
1275         return 0;
1276
1277     if (!s->dropable) {
1278         err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
1279         h->prev_poc_msb = h->poc_msb;
1280         h->prev_poc_lsb = h->poc_lsb;
1281     }
1282     h->prev_frame_num_offset = h->frame_num_offset;
1283     h->prev_frame_num        = h->frame_num;
1284     h->outputed_poc          = h->next_outputed_poc;
1285
1286     return err;
1287 }
1288
1289 int ff_h264_frame_start(H264Context *h)
1290 {
1291     MpegEncContext *const s = &h->s;
1292     int i;
1293     const int pixel_shift = h->pixel_shift;
1294
1295     if (ff_MPV_frame_start(s, s->avctx) < 0)
1296         return -1;
1297     ff_er_frame_start(s);
1298     /*
1299      * ff_MPV_frame_start uses pict_type to derive key_frame.
1300      * This is incorrect for H.264; IDR markings must be used.
1301      * Zero here; IDR markings per slice in frame or fields are ORed in later.
1302      * See decode_nal_units().
1303      */
1304     s->current_picture_ptr->f.key_frame = 0;
1305     s->current_picture_ptr->sync        = 0;
1306     s->current_picture_ptr->mmco_reset  = 0;
1307
1308     assert(s->linesize && s->uvlinesize);
1309
1310     for (i = 0; i < 16; i++) {
1311         h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * s->linesize * ((scan8[i] - scan8[0]) >> 3);
1312         h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * s->linesize * ((scan8[i] - scan8[0]) >> 3);
1313     }
1314     for (i = 0; i < 16; i++) {
1315         h->block_offset[16 + i]      =
1316         h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * s->uvlinesize * ((scan8[i] - scan8[0]) >> 3);
1317         h->block_offset[48 + 16 + i] =
1318         h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * s->uvlinesize * ((scan8[i] - scan8[0]) >> 3);
1319     }
1320
1321     /* can't be in alloc_tables because linesize isn't known there.
1322      * FIXME: redo bipred weight to not require extra buffer? */
1323     for (i = 0; i < s->slice_context_count; i++)
1324         if (h->thread_context[i] && !h->thread_context[i]->s.obmc_scratchpad)
1325             h->thread_context[i]->s.obmc_scratchpad = av_malloc(16 * 6 * s->linesize);
1326
1327     /* Some macroblocks can be accessed before they're available in case
1328      * of lost slices, MBAFF or threading. */
1329     memset(h->slice_table, -1,
1330            (s->mb_height * s->mb_stride - 1) * sizeof(*h->slice_table));
1331
1332     // s->decode = (s->flags & CODEC_FLAG_PSNR) || !s->encoding ||
1333     //             s->current_picture.f.reference /* || h->contains_intra */ || 1;
1334
1335     /* We mark the current picture as non-reference after allocating it, so
1336      * that if we break out due to an error it can be released automatically
1337      * in the next ff_MPV_frame_start().
1338      * SVQ3 as well as most other codecs have only last/next/current and thus
1339      * get released even with set reference, besides SVQ3 and others do not
1340      * mark frames as reference later "naturally". */
1341     if (s->codec_id != AV_CODEC_ID_SVQ3)
1342         s->current_picture_ptr->f.reference = 0;
1343
1344     s->current_picture_ptr->field_poc[0]     =
1345         s->current_picture_ptr->field_poc[1] = INT_MAX;
1346
1347     h->next_output_pic = NULL;
1348
1349     assert(s->current_picture_ptr->long_ref == 0);
1350
1351     return 0;
1352 }
1353
1354 /**
1355  * Run setup operations that must be run after slice header decoding.
1356  * This includes finding the next displayed frame.
1357  *
1358  * @param h h264 master context
1359  * @param setup_finished enough NALs have been read that we can call
1360  * ff_thread_finish_setup()
1361  */
1362 static void decode_postinit(H264Context *h, int setup_finished)
1363 {
1364     MpegEncContext *const s = &h->s;
1365     Picture *out = s->current_picture_ptr;
1366     Picture *cur = s->current_picture_ptr;
1367     int i, pics, out_of_order, out_idx;
1368
1369     s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_H264;
1370     s->current_picture_ptr->f.pict_type   = s->pict_type;
1371
1372     if (h->next_output_pic)
1373         return;
1374
1375     if (cur->field_poc[0] == INT_MAX || cur->field_poc[1] == INT_MAX) {
1376         /* FIXME: if we have two PAFF fields in one packet, we can't start
1377          * the next thread here. If we have one field per packet, we can.
1378          * The check in decode_nal_units() is not good enough to find this
1379          * yet, so we assume the worst for now. */
1380         // if (setup_finished)
1381         //    ff_thread_finish_setup(s->avctx);
1382         return;
1383     }
1384
1385     cur->f.interlaced_frame = 0;
1386     cur->f.repeat_pict      = 0;
1387
1388     /* Signal interlacing information externally. */
1389     /* Prioritize picture timing SEI information over used
1390      * decoding process if it exists. */
1391
1392     if (h->sps.pic_struct_present_flag) {
1393         switch (h->sei_pic_struct) {
1394         case SEI_PIC_STRUCT_FRAME:
1395             break;
1396         case SEI_PIC_STRUCT_TOP_FIELD:
1397         case SEI_PIC_STRUCT_BOTTOM_FIELD:
1398             cur->f.interlaced_frame = 1;
1399             break;
1400         case SEI_PIC_STRUCT_TOP_BOTTOM:
1401         case SEI_PIC_STRUCT_BOTTOM_TOP:
1402             if (FIELD_OR_MBAFF_PICTURE)
1403                 cur->f.interlaced_frame = 1;
1404             else
1405                 // try to flag soft telecine progressive
1406                 cur->f.interlaced_frame = h->prev_interlaced_frame;
1407             break;
1408         case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
1409         case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
1410             /* Signal the possibility of telecined film externally
1411              * (pic_struct 5,6). From these hints, let the applications
1412              * decide if they apply deinterlacing. */
1413             cur->f.repeat_pict = 1;
1414             break;
1415         case SEI_PIC_STRUCT_FRAME_DOUBLING:
1416             // Force progressive here, doubling interlaced frame is a bad idea.
1417             cur->f.repeat_pict = 2;
1418             break;
1419         case SEI_PIC_STRUCT_FRAME_TRIPLING:
1420             cur->f.repeat_pict = 4;
1421             break;
1422         }
1423
1424         if ((h->sei_ct_type & 3) &&
1425             h->sei_pic_struct <= SEI_PIC_STRUCT_BOTTOM_TOP)
1426             cur->f.interlaced_frame = (h->sei_ct_type & (1 << 1)) != 0;
1427     } else {
1428         /* Derive interlacing flag from used decoding process. */
1429         cur->f.interlaced_frame = FIELD_OR_MBAFF_PICTURE;
1430     }
1431     h->prev_interlaced_frame = cur->f.interlaced_frame;
1432
1433     if (cur->field_poc[0] != cur->field_poc[1]) {
1434         /* Derive top_field_first from field pocs. */
1435         cur->f.top_field_first = cur->field_poc[0] < cur->field_poc[1];
1436     } else {
1437         if (cur->f.interlaced_frame || h->sps.pic_struct_present_flag) {
1438             /* Use picture timing SEI information. Even if it is a
1439              * information of a past frame, better than nothing. */
1440             if (h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM ||
1441                 h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM_TOP)
1442                 cur->f.top_field_first = 1;
1443             else
1444                 cur->f.top_field_first = 0;
1445         } else {
1446             /* Most likely progressive */
1447             cur->f.top_field_first = 0;
1448         }
1449     }
1450
1451     cur->mmco_reset = h->mmco_reset;
1452     h->mmco_reset = 0;
1453     // FIXME do something with unavailable reference frames
1454
1455     /* Sort B-frames into display order */
1456
1457     if (h->sps.bitstream_restriction_flag &&
1458         s->avctx->has_b_frames < h->sps.num_reorder_frames) {
1459         s->avctx->has_b_frames = h->sps.num_reorder_frames;
1460         s->low_delay           = 0;
1461     }
1462
1463     if (s->avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT &&
1464         !h->sps.bitstream_restriction_flag) {
1465         s->avctx->has_b_frames = MAX_DELAYED_PIC_COUNT - 1;
1466         s->low_delay           = 0;
1467     }
1468
1469     for (i = 0; 1; i++) {
1470         if(i == MAX_DELAYED_PIC_COUNT || cur->poc < h->last_pocs[i]){
1471             if(i)
1472                 h->last_pocs[i-1] = cur->poc;
1473             break;
1474         } else if(i) {
1475             h->last_pocs[i-1]= h->last_pocs[i];
1476         }
1477     }
1478     out_of_order = MAX_DELAYED_PIC_COUNT - i;
1479     if(   cur->f.pict_type == AV_PICTURE_TYPE_B
1480        || (h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > INT_MIN && h->last_pocs[MAX_DELAYED_PIC_COUNT-1] - h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > 2))
1481         out_of_order = FFMAX(out_of_order, 1);
1482     if(s->avctx->has_b_frames < out_of_order && !h->sps.bitstream_restriction_flag){
1483         av_log(s->avctx, AV_LOG_VERBOSE, "Increasing reorder buffer to %d\n", out_of_order);
1484         s->avctx->has_b_frames = out_of_order;
1485         s->low_delay = 0;
1486     }
1487
1488     pics = 0;
1489     while (h->delayed_pic[pics])
1490         pics++;
1491
1492     av_assert0(pics <= MAX_DELAYED_PIC_COUNT);
1493
1494     h->delayed_pic[pics++] = cur;
1495     if (cur->f.reference == 0)
1496         cur->f.reference = DELAYED_PIC_REF;
1497
1498     out = h->delayed_pic[0];
1499     out_idx = 0;
1500     for (i = 1; h->delayed_pic[i] &&
1501                 !h->delayed_pic[i]->f.key_frame &&
1502                 !h->delayed_pic[i]->mmco_reset;
1503          i++)
1504         if (h->delayed_pic[i]->poc < out->poc) {
1505             out     = h->delayed_pic[i];
1506             out_idx = i;
1507         }
1508     if (s->avctx->has_b_frames == 0 &&
1509         (h->delayed_pic[0]->f.key_frame || h->delayed_pic[0]->mmco_reset))
1510         h->next_outputed_poc = INT_MIN;
1511     out_of_order = out->poc < h->next_outputed_poc;
1512
1513     if (out_of_order || pics > s->avctx->has_b_frames) {
1514         out->f.reference &= ~DELAYED_PIC_REF;
1515         // for frame threading, the owner must be the second field's thread or
1516         // else the first thread can release the picture and reuse it unsafely
1517         out->owner2       = s;
1518         for (i = out_idx; h->delayed_pic[i]; i++)
1519             h->delayed_pic[i] = h->delayed_pic[i + 1];
1520     }
1521     if (!out_of_order && pics > s->avctx->has_b_frames) {
1522         h->next_output_pic = out;
1523         if (out_idx == 0 && h->delayed_pic[0] && (h->delayed_pic[0]->f.key_frame || h->delayed_pic[0]->mmco_reset)) {
1524             h->next_outputed_poc = INT_MIN;
1525         } else
1526             h->next_outputed_poc = out->poc;
1527     } else {
1528         av_log(s->avctx, AV_LOG_DEBUG, "no picture %s\n", out_of_order ? "ooo" : "");
1529     }
1530
1531     if (h->next_output_pic && h->next_output_pic->sync) {
1532         h->sync |= 2;
1533     }
1534
1535     if (setup_finished)
1536         ff_thread_finish_setup(s->avctx);
1537 }
1538
1539 static av_always_inline void backup_mb_border(H264Context *h, uint8_t *src_y,
1540                                               uint8_t *src_cb, uint8_t *src_cr,
1541                                               int linesize, int uvlinesize,
1542                                               int simple)
1543 {
1544     MpegEncContext *const s = &h->s;
1545     uint8_t *top_border;
1546     int top_idx = 1;
1547     const int pixel_shift = h->pixel_shift;
1548     int chroma444 = CHROMA444;
1549     int chroma422 = CHROMA422;
1550
1551     src_y  -= linesize;
1552     src_cb -= uvlinesize;
1553     src_cr -= uvlinesize;
1554
1555     if (!simple && FRAME_MBAFF) {
1556         if (s->mb_y & 1) {
1557             if (!MB_MBAFF) {
1558                 top_border = h->top_borders[0][s->mb_x];
1559                 AV_COPY128(top_border, src_y + 15 * linesize);
1560                 if (pixel_shift)
1561                     AV_COPY128(top_border + 16, src_y + 15 * linesize + 16);
1562                 if (simple || !CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
1563                     if (chroma444) {
1564                         if (pixel_shift) {
1565                             AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
1566                             AV_COPY128(top_border + 48, src_cb + 15 * uvlinesize + 16);
1567                             AV_COPY128(top_border + 64, src_cr + 15 * uvlinesize);
1568                             AV_COPY128(top_border + 80, src_cr + 15 * uvlinesize + 16);
1569                         } else {
1570                             AV_COPY128(top_border + 16, src_cb + 15 * uvlinesize);
1571                             AV_COPY128(top_border + 32, src_cr + 15 * uvlinesize);
1572                         }
1573                     } else if (chroma422) {
1574                         if (pixel_shift) {
1575                             AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
1576                             AV_COPY128(top_border + 48, src_cr + 15 * uvlinesize);
1577                         } else {
1578                             AV_COPY64(top_border + 16, src_cb + 15 * uvlinesize);
1579                             AV_COPY64(top_border + 24, src_cr + 15 * uvlinesize);
1580                         }
1581                     } else {
1582                         if (pixel_shift) {
1583                             AV_COPY128(top_border + 32, src_cb + 7 * uvlinesize);
1584                             AV_COPY128(top_border + 48, src_cr + 7 * uvlinesize);
1585                         } else {
1586                             AV_COPY64(top_border + 16, src_cb + 7 * uvlinesize);
1587                             AV_COPY64(top_border + 24, src_cr + 7 * uvlinesize);
1588                         }
1589                     }
1590                 }
1591             }
1592         } else if (MB_MBAFF) {
1593             top_idx = 0;
1594         } else
1595             return;
1596     }
1597
1598     top_border = h->top_borders[top_idx][s->mb_x];
1599     /* There are two lines saved, the line above the top macroblock
1600      * of a pair, and the line above the bottom macroblock. */
1601     AV_COPY128(top_border, src_y + 16 * linesize);
1602     if (pixel_shift)
1603         AV_COPY128(top_border + 16, src_y + 16 * linesize + 16);
1604
1605     if (simple || !CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
1606         if (chroma444) {
1607             if (pixel_shift) {
1608                 AV_COPY128(top_border + 32, src_cb + 16 * linesize);
1609                 AV_COPY128(top_border + 48, src_cb + 16 * linesize + 16);
1610                 AV_COPY128(top_border + 64, src_cr + 16 * linesize);
1611                 AV_COPY128(top_border + 80, src_cr + 16 * linesize + 16);
1612             } else {
1613                 AV_COPY128(top_border + 16, src_cb + 16 * linesize);
1614                 AV_COPY128(top_border + 32, src_cr + 16 * linesize);
1615             }
1616         } else if (chroma422) {
1617             if (pixel_shift) {
1618                 AV_COPY128(top_border + 32, src_cb + 16 * uvlinesize);
1619                 AV_COPY128(top_border + 48, src_cr + 16 * uvlinesize);
1620             } else {
1621                 AV_COPY64(top_border + 16, src_cb + 16 * uvlinesize);
1622                 AV_COPY64(top_border + 24, src_cr + 16 * uvlinesize);
1623             }
1624         } else {
1625             if (pixel_shift) {
1626                 AV_COPY128(top_border + 32, src_cb + 8 * uvlinesize);
1627                 AV_COPY128(top_border + 48, src_cr + 8 * uvlinesize);
1628             } else {
1629                 AV_COPY64(top_border + 16, src_cb + 8 * uvlinesize);
1630                 AV_COPY64(top_border + 24, src_cr + 8 * uvlinesize);
1631             }
1632         }
1633     }
1634 }
1635
1636 static av_always_inline void xchg_mb_border(H264Context *h, uint8_t *src_y,
1637                                             uint8_t *src_cb, uint8_t *src_cr,
1638                                             int linesize, int uvlinesize,
1639                                             int xchg, int chroma444,
1640                                             int simple, int pixel_shift)
1641 {
1642     MpegEncContext *const s = &h->s;
1643     int deblock_topleft;
1644     int deblock_top;
1645     int top_idx = 1;
1646     uint8_t *top_border_m1;
1647     uint8_t *top_border;
1648
1649     if (!simple && FRAME_MBAFF) {
1650         if (s->mb_y & 1) {
1651             if (!MB_MBAFF)
1652                 return;
1653         } else {
1654             top_idx = MB_MBAFF ? 0 : 1;
1655         }
1656     }
1657
1658     if (h->deblocking_filter == 2) {
1659         deblock_topleft = h->slice_table[h->mb_xy - 1 - s->mb_stride] == h->slice_num;
1660         deblock_top     = h->top_type;
1661     } else {
1662         deblock_topleft = (s->mb_x > 0);
1663         deblock_top     = (s->mb_y > !!MB_FIELD);
1664     }
1665
1666     src_y  -= linesize   + 1 + pixel_shift;
1667     src_cb -= uvlinesize + 1 + pixel_shift;
1668     src_cr -= uvlinesize + 1 + pixel_shift;
1669
1670     top_border_m1 = h->top_borders[top_idx][s->mb_x - 1];
1671     top_border    = h->top_borders[top_idx][s->mb_x];
1672
1673 #define XCHG(a, b, xchg)                        \
1674     if (pixel_shift) {                          \
1675         if (xchg) {                             \
1676             AV_SWAP64(b + 0, a + 0);            \
1677             AV_SWAP64(b + 8, a + 8);            \
1678         } else {                                \
1679             AV_COPY128(b, a);                   \
1680         }                                       \
1681     } else if (xchg)                            \
1682         AV_SWAP64(b, a);                        \
1683     else                                        \
1684         AV_COPY64(b, a);
1685
1686     if (deblock_top) {
1687         if (deblock_topleft) {
1688             XCHG(top_border_m1 + (8 << pixel_shift),
1689                  src_y - (7 << pixel_shift), 1);
1690         }
1691         XCHG(top_border + (0 << pixel_shift), src_y + (1 << pixel_shift), xchg);
1692         XCHG(top_border + (8 << pixel_shift), src_y + (9 << pixel_shift), 1);
1693         if (s->mb_x + 1 < s->mb_width) {
1694             XCHG(h->top_borders[top_idx][s->mb_x + 1],
1695                  src_y + (17 << pixel_shift), 1);
1696         }
1697     }
1698     if (simple || !CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
1699         if (chroma444) {
1700             if (deblock_topleft) {
1701                 XCHG(top_border_m1 + (24 << pixel_shift), src_cb - (7 << pixel_shift), 1);
1702                 XCHG(top_border_m1 + (40 << pixel_shift), src_cr - (7 << pixel_shift), 1);
1703             }
1704             XCHG(top_border + (16 << pixel_shift), src_cb + (1 << pixel_shift), xchg);
1705             XCHG(top_border + (24 << pixel_shift), src_cb + (9 << pixel_shift), 1);
1706             XCHG(top_border + (32 << pixel_shift), src_cr + (1 << pixel_shift), xchg);
1707             XCHG(top_border + (40 << pixel_shift), src_cr + (9 << pixel_shift), 1);
1708             if (s->mb_x + 1 < s->mb_width) {
1709                 XCHG(h->top_borders[top_idx][s->mb_x + 1] + (16 << pixel_shift), src_cb + (17 << pixel_shift), 1);
1710                 XCHG(h->top_borders[top_idx][s->mb_x + 1] + (32 << pixel_shift), src_cr + (17 << pixel_shift), 1);
1711             }
1712         } else {
1713             if (deblock_top) {
1714                 if (deblock_topleft) {
1715                     XCHG(top_border_m1 + (16 << pixel_shift), src_cb - (7 << pixel_shift), 1);
1716                     XCHG(top_border_m1 + (24 << pixel_shift), src_cr - (7 << pixel_shift), 1);
1717                 }
1718                 XCHG(top_border + (16 << pixel_shift), src_cb + 1 + pixel_shift, 1);
1719                 XCHG(top_border + (24 << pixel_shift), src_cr + 1 + pixel_shift, 1);
1720             }
1721         }
1722     }
1723 }
1724
1725 static av_always_inline int dctcoef_get(DCTELEM *mb, int high_bit_depth,
1726                                         int index)
1727 {
1728     if (high_bit_depth) {
1729         return AV_RN32A(((int32_t *)mb) + index);
1730     } else
1731         return AV_RN16A(mb + index);
1732 }
1733
1734 static av_always_inline void dctcoef_set(DCTELEM *mb, int high_bit_depth,
1735                                          int index, int value)
1736 {
1737     if (high_bit_depth) {
1738         AV_WN32A(((int32_t *)mb) + index, value);
1739     } else
1740         AV_WN16A(mb + index, value);
1741 }
1742
1743 static av_always_inline void hl_decode_mb_predict_luma(H264Context *h,
1744                                                        int mb_type, int is_h264,
1745                                                        int simple,
1746                                                        int transform_bypass,
1747                                                        int pixel_shift,
1748                                                        int *block_offset,
1749                                                        int linesize,
1750                                                        uint8_t *dest_y, int p)
1751 {
1752     MpegEncContext *const s = &h->s;
1753     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);
1754     void (*idct_dc_add)(uint8_t *dst, DCTELEM *block, int stride);
1755     int i;
1756     int qscale = p == 0 ? s->qscale : h->chroma_qp[p - 1];
1757     block_offset += 16 * p;
1758     if (IS_INTRA4x4(mb_type)) {
1759         if (simple || !s->encoding) {
1760             if (IS_8x8DCT(mb_type)) {
1761                 if (transform_bypass) {
1762                     idct_dc_add  =
1763                     idct_add     = s->dsp.add_pixels8;
1764                 } else {
1765                     idct_dc_add = h->h264dsp.h264_idct8_dc_add;
1766                     idct_add    = h->h264dsp.h264_idct8_add;
1767                 }
1768                 for (i = 0; i < 16; i += 4) {
1769                     uint8_t *const ptr = dest_y + block_offset[i];
1770                     const int dir      = h->intra4x4_pred_mode_cache[scan8[i]];
1771                     if (transform_bypass && h->sps.profile_idc == 244 && dir <= 1) {
1772                         h->hpc.pred8x8l_add[dir](ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1773                     } else {
1774                         const int nnz = h->non_zero_count_cache[scan8[i + p * 16]];
1775                         h->hpc.pred8x8l[dir](ptr, (h->topleft_samples_available << i) & 0x8000,
1776                                              (h->topright_samples_available << i) & 0x4000, linesize);
1777                         if (nnz) {
1778                             if (nnz == 1 && dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
1779                                 idct_dc_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1780                             else
1781                                 idct_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1782                         }
1783                     }
1784                 }
1785             } else {
1786                 if (transform_bypass) {
1787                     idct_dc_add  =
1788                         idct_add = s->dsp.add_pixels4;
1789                 } else {
1790                     idct_dc_add = h->h264dsp.h264_idct_dc_add;
1791                     idct_add    = h->h264dsp.h264_idct_add;
1792                 }
1793                 for (i = 0; i < 16; i++) {
1794                     uint8_t *const ptr = dest_y + block_offset[i];
1795                     const int dir      = h->intra4x4_pred_mode_cache[scan8[i]];
1796
1797                     if (transform_bypass && h->sps.profile_idc == 244 && dir <= 1) {
1798                         h->hpc.pred4x4_add[dir](ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1799                     } else {
1800                         uint8_t *topright;
1801                         int nnz, tr;
1802                         uint64_t tr_high;
1803                         if (dir == DIAG_DOWN_LEFT_PRED || dir == VERT_LEFT_PRED) {
1804                             const int topright_avail = (h->topright_samples_available << i) & 0x8000;
1805                             av_assert2(s->mb_y || linesize <= block_offset[i]);
1806                             if (!topright_avail) {
1807                                 if (pixel_shift) {
1808                                     tr_high  = ((uint16_t *)ptr)[3 - linesize / 2] * 0x0001000100010001ULL;
1809                                     topright = (uint8_t *)&tr_high;
1810                                 } else {
1811                                     tr       = ptr[3 - linesize] * 0x01010101u;
1812                                     topright = (uint8_t *)&tr;
1813                                 }
1814                             } else
1815                                 topright = ptr + (4 << pixel_shift) - linesize;
1816                         } else
1817                             topright = NULL;
1818
1819                         h->hpc.pred4x4[dir](ptr, topright, linesize);
1820                         nnz = h->non_zero_count_cache[scan8[i + p * 16]];
1821                         if (nnz) {
1822                             if (is_h264) {
1823                                 if (nnz == 1 && dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
1824                                     idct_dc_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1825                                 else
1826                                     idct_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
1827                             } else if (CONFIG_SVQ3_DECODER)
1828                                 ff_svq3_add_idct_c(ptr, h->mb + i * 16 + p * 256, linesize, qscale, 0);
1829                         }
1830                     }
1831                 }
1832             }
1833         }
1834     } else {
1835         h->hpc.pred16x16[h->intra16x16_pred_mode](dest_y, linesize);
1836         if (is_h264) {
1837             if (h->non_zero_count_cache[scan8[LUMA_DC_BLOCK_INDEX + p]]) {
1838                 if (!transform_bypass)
1839                     h->h264dsp.h264_luma_dc_dequant_idct(h->mb + (p * 256 << pixel_shift),
1840                                                          h->mb_luma_dc[p],
1841                                                          h->dequant4_coeff[p][qscale][0]);
1842                 else {
1843                     static const uint8_t dc_mapping[16] = {
1844                          0 * 16,  1 * 16,  4 * 16,  5 * 16,
1845                          2 * 16,  3 * 16,  6 * 16,  7 * 16,
1846                          8 * 16,  9 * 16, 12 * 16, 13 * 16,
1847                         10 * 16, 11 * 16, 14 * 16, 15 * 16 };
1848                     for (i = 0; i < 16; i++)
1849                         dctcoef_set(h->mb + (p * 256 << pixel_shift),
1850                                     pixel_shift, dc_mapping[i],
1851                                     dctcoef_get(h->mb_luma_dc[p],
1852                                                 pixel_shift, i));
1853                 }
1854             }
1855         } else if (CONFIG_SVQ3_DECODER)
1856             ff_svq3_luma_dc_dequant_idct_c(h->mb + p * 256,
1857                                            h->mb_luma_dc[p], qscale);
1858     }
1859 }
1860
1861 static av_always_inline void hl_decode_mb_idct_luma(H264Context *h, int mb_type,
1862                                                     int is_h264, int simple,
1863                                                     int transform_bypass,
1864                                                     int pixel_shift,
1865                                                     int *block_offset,
1866                                                     int linesize,
1867                                                     uint8_t *dest_y, int p)
1868 {
1869     MpegEncContext *const s = &h->s;
1870     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);
1871     int i;
1872     block_offset += 16 * p;
1873     if (!IS_INTRA4x4(mb_type)) {
1874         if (is_h264) {
1875             if (IS_INTRA16x16(mb_type)) {
1876                 if (transform_bypass) {
1877                     if (h->sps.profile_idc == 244 &&
1878                         (h->intra16x16_pred_mode == VERT_PRED8x8 ||
1879                          h->intra16x16_pred_mode == HOR_PRED8x8)) {
1880                         h->hpc.pred16x16_add[h->intra16x16_pred_mode](dest_y, block_offset,
1881                                                                       h->mb + (p * 256 << pixel_shift),
1882                                                                       linesize);
1883                     } else {
1884                         for (i = 0; i < 16; i++)
1885                             if (h->non_zero_count_cache[scan8[i + p * 16]] ||
1886                                 dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
1887                                 s->dsp.add_pixels4(dest_y + block_offset[i],
1888                                                    h->mb + (i * 16 + p * 256 << pixel_shift),
1889                                                    linesize);
1890                     }
1891                 } else {
1892                     h->h264dsp.h264_idct_add16intra(dest_y, block_offset,
1893                                                     h->mb + (p * 256 << pixel_shift),
1894                                                     linesize,
1895                                                     h->non_zero_count_cache + p * 5 * 8);
1896                 }
1897             } else if (h->cbp & 15) {
1898                 if (transform_bypass) {
1899                     const int di = IS_8x8DCT(mb_type) ? 4 : 1;
1900                     idct_add = IS_8x8DCT(mb_type) ? s->dsp.add_pixels8
1901                                                   : s->dsp.add_pixels4;
1902                     for (i = 0; i < 16; i += di)
1903                         if (h->non_zero_count_cache[scan8[i + p * 16]])
1904                             idct_add(dest_y + block_offset[i],
1905                                      h->mb + (i * 16 + p * 256 << pixel_shift),
1906                                      linesize);
1907                 } else {
1908                     if (IS_8x8DCT(mb_type))
1909                         h->h264dsp.h264_idct8_add4(dest_y, block_offset,
1910                                                    h->mb + (p * 256 << pixel_shift),
1911                                                    linesize,
1912                                                    h->non_zero_count_cache + p * 5 * 8);
1913                     else
1914                         h->h264dsp.h264_idct_add16(dest_y, block_offset,
1915                                                    h->mb + (p * 256 << pixel_shift),
1916                                                    linesize,
1917                                                    h->non_zero_count_cache + p * 5 * 8);
1918                 }
1919             }
1920         } else if (CONFIG_SVQ3_DECODER) {
1921             for (i = 0; i < 16; i++)
1922                 if (h->non_zero_count_cache[scan8[i + p * 16]] || h->mb[i * 16 + p * 256]) {
1923                     // FIXME benchmark weird rule, & below
1924                     uint8_t *const ptr = dest_y + block_offset[i];
1925                     ff_svq3_add_idct_c(ptr, h->mb + i * 16 + p * 256, linesize,
1926                                        s->qscale, IS_INTRA(mb_type) ? 1 : 0);
1927                 }
1928         }
1929     }
1930 }
1931
1932 #define BITS   8
1933 #define SIMPLE 1
1934 #include "h264_mb_template.c"
1935
1936 #undef  BITS
1937 #define BITS   16
1938 #include "h264_mb_template.c"
1939
1940 #undef  SIMPLE
1941 #define SIMPLE 0
1942 #include "h264_mb_template.c"
1943
1944 void ff_h264_hl_decode_mb(H264Context *h)
1945 {
1946     MpegEncContext *const s = &h->s;
1947     const int mb_xy   = h->mb_xy;
1948     const int mb_type = s->current_picture.f.mb_type[mb_xy];
1949     int is_complex    = CONFIG_SMALL || h->is_complex || IS_INTRA_PCM(mb_type) || s->qscale == 0;
1950
1951     if (CHROMA444) {
1952         if (is_complex || h->pixel_shift)
1953             hl_decode_mb_444_complex(h);
1954         else
1955             hl_decode_mb_444_simple_8(h);
1956     } else if (is_complex) {
1957         hl_decode_mb_complex(h);
1958     } else if (h->pixel_shift) {
1959         hl_decode_mb_simple_16(h);
1960     } else
1961         hl_decode_mb_simple_8(h);
1962 }
1963
1964 static int pred_weight_table(H264Context *h)
1965 {
1966     MpegEncContext *const s = &h->s;
1967     int list, i;
1968     int luma_def, chroma_def;
1969
1970     h->use_weight             = 0;
1971     h->use_weight_chroma      = 0;
1972     h->luma_log2_weight_denom = get_ue_golomb(&s->gb);
1973     if (h->sps.chroma_format_idc)
1974         h->chroma_log2_weight_denom = get_ue_golomb(&s->gb);
1975     luma_def   = 1 << h->luma_log2_weight_denom;
1976     chroma_def = 1 << h->chroma_log2_weight_denom;
1977
1978     for (list = 0; list < 2; list++) {
1979         h->luma_weight_flag[list]   = 0;
1980         h->chroma_weight_flag[list] = 0;
1981         for (i = 0; i < h->ref_count[list]; i++) {
1982             int luma_weight_flag, chroma_weight_flag;
1983
1984             luma_weight_flag = get_bits1(&s->gb);
1985             if (luma_weight_flag) {
1986                 h->luma_weight[i][list][0] = get_se_golomb(&s->gb);
1987                 h->luma_weight[i][list][1] = get_se_golomb(&s->gb);
1988                 if (h->luma_weight[i][list][0] != luma_def ||
1989                     h->luma_weight[i][list][1] != 0) {
1990                     h->use_weight             = 1;
1991                     h->luma_weight_flag[list] = 1;
1992                 }
1993             } else {
1994                 h->luma_weight[i][list][0] = luma_def;
1995                 h->luma_weight[i][list][1] = 0;
1996             }
1997
1998             if (h->sps.chroma_format_idc) {
1999                 chroma_weight_flag = get_bits1(&s->gb);
2000                 if (chroma_weight_flag) {
2001                     int j;
2002                     for (j = 0; j < 2; j++) {
2003                         h->chroma_weight[i][list][j][0] = get_se_golomb(&s->gb);
2004                         h->chroma_weight[i][list][j][1] = get_se_golomb(&s->gb);
2005                         if (h->chroma_weight[i][list][j][0] != chroma_def ||
2006                             h->chroma_weight[i][list][j][1] != 0) {
2007                             h->use_weight_chroma = 1;
2008                             h->chroma_weight_flag[list] = 1;
2009                         }
2010                     }
2011                 } else {
2012                     int j;
2013                     for (j = 0; j < 2; j++) {
2014                         h->chroma_weight[i][list][j][0] = chroma_def;
2015                         h->chroma_weight[i][list][j][1] = 0;
2016                     }
2017                 }
2018             }
2019         }
2020         if (h->slice_type_nos != AV_PICTURE_TYPE_B)
2021             break;
2022     }
2023     h->use_weight = h->use_weight || h->use_weight_chroma;
2024     return 0;
2025 }
2026
2027 /**
2028  * Initialize implicit_weight table.
2029  * @param field  0/1 initialize the weight for interlaced MBAFF
2030  *                -1 initializes the rest
2031  */
2032 static void implicit_weight_table(H264Context *h, int field)
2033 {
2034     MpegEncContext *const s = &h->s;
2035     int ref0, ref1, i, cur_poc, ref_start, ref_count0, ref_count1;
2036
2037     for (i = 0; i < 2; i++) {
2038         h->luma_weight_flag[i]   = 0;
2039         h->chroma_weight_flag[i] = 0;
2040     }
2041
2042     if (field < 0) {
2043         if (s->picture_structure == PICT_FRAME) {
2044             cur_poc = s->current_picture_ptr->poc;
2045         } else {
2046             cur_poc = s->current_picture_ptr->field_poc[s->picture_structure - 1];
2047         }
2048         if (h->ref_count[0] == 1 && h->ref_count[1] == 1 && !FRAME_MBAFF &&
2049             h->ref_list[0][0].poc + h->ref_list[1][0].poc == 2 * cur_poc) {
2050             h->use_weight = 0;
2051             h->use_weight_chroma = 0;
2052             return;
2053         }
2054         ref_start  = 0;
2055         ref_count0 = h->ref_count[0];
2056         ref_count1 = h->ref_count[1];
2057     } else {
2058         cur_poc    = s->current_picture_ptr->field_poc[field];
2059         ref_start  = 16;
2060         ref_count0 = 16 + 2 * h->ref_count[0];
2061         ref_count1 = 16 + 2 * h->ref_count[1];
2062     }
2063
2064     h->use_weight               = 2;
2065     h->use_weight_chroma        = 2;
2066     h->luma_log2_weight_denom   = 5;
2067     h->chroma_log2_weight_denom = 5;
2068
2069     for (ref0 = ref_start; ref0 < ref_count0; ref0++) {
2070         int poc0 = h->ref_list[0][ref0].poc;
2071         for (ref1 = ref_start; ref1 < ref_count1; ref1++) {
2072             int w = 32;
2073             if (!h->ref_list[0][ref0].long_ref && !h->ref_list[1][ref1].long_ref) {
2074                 int poc1 = h->ref_list[1][ref1].poc;
2075                 int td   = av_clip(poc1 - poc0, -128, 127);
2076                 if (td) {
2077                     int tb = av_clip(cur_poc - poc0, -128, 127);
2078                     int tx = (16384 + (FFABS(td) >> 1)) / td;
2079                     int dist_scale_factor = (tb * tx + 32) >> 8;
2080                     if (dist_scale_factor >= -64 && dist_scale_factor <= 128)
2081                         w = 64 - dist_scale_factor;
2082                 }
2083             }
2084             if (field < 0) {
2085                 h->implicit_weight[ref0][ref1][0] =
2086                 h->implicit_weight[ref0][ref1][1] = w;
2087             } else {
2088                 h->implicit_weight[ref0][ref1][field] = w;
2089             }
2090         }
2091     }
2092 }
2093
2094 /**
2095  * instantaneous decoder refresh.
2096  */
2097 static void idr(H264Context *h)
2098 {
2099     int i;
2100     ff_h264_remove_all_refs(h);
2101     h->prev_frame_num        = 0;
2102     h->prev_frame_num_offset = 0;
2103     h->prev_poc_msb          = 1<<16;
2104     h->prev_poc_lsb          = 0;
2105     for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
2106         h->last_pocs[i] = INT_MIN;
2107 }
2108
2109 /* forget old pics after a seek */
2110 static void flush_dpb(AVCodecContext *avctx)
2111 {
2112     H264Context *h = avctx->priv_data;
2113     int i;
2114     for (i=0; i<=MAX_DELAYED_PIC_COUNT; i++) {
2115         if (h->delayed_pic[i])
2116             h->delayed_pic[i]->f.reference = 0;
2117         h->delayed_pic[i] = NULL;
2118     }
2119     h->outputed_poc = h->next_outputed_poc = INT_MIN;
2120     h->prev_interlaced_frame = 1;
2121     idr(h);
2122     h->prev_frame_num = -1;
2123     if (h->s.current_picture_ptr)
2124         h->s.current_picture_ptr->f.reference = 0;
2125     h->s.first_field = 0;
2126     ff_h264_reset_sei(h);
2127     ff_mpeg_flush(avctx);
2128     h->recovery_frame= -1;
2129     h->sync= 0;
2130 }
2131
2132 static int init_poc(H264Context *h)
2133 {
2134     MpegEncContext *const s = &h->s;
2135     const int max_frame_num = 1 << h->sps.log2_max_frame_num;
2136     int field_poc[2];
2137     Picture *cur = s->current_picture_ptr;
2138
2139     h->frame_num_offset = h->prev_frame_num_offset;
2140     if (h->frame_num < h->prev_frame_num)
2141         h->frame_num_offset += max_frame_num;
2142
2143     if (h->sps.poc_type == 0) {
2144         const int max_poc_lsb = 1 << h->sps.log2_max_poc_lsb;
2145
2146         if (h->poc_lsb < h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb / 2)
2147             h->poc_msb = h->prev_poc_msb + max_poc_lsb;
2148         else if (h->poc_lsb > h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb / 2)
2149             h->poc_msb = h->prev_poc_msb - max_poc_lsb;
2150         else
2151             h->poc_msb = h->prev_poc_msb;
2152         field_poc[0] =
2153         field_poc[1] = h->poc_msb + h->poc_lsb;
2154         if (s->picture_structure == PICT_FRAME)
2155             field_poc[1] += h->delta_poc_bottom;
2156     } else if (h->sps.poc_type == 1) {
2157         int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
2158         int i;
2159
2160         if (h->sps.poc_cycle_length != 0)
2161             abs_frame_num = h->frame_num_offset + h->frame_num;
2162         else
2163             abs_frame_num = 0;
2164
2165         if (h->nal_ref_idc == 0 && abs_frame_num > 0)
2166             abs_frame_num--;
2167
2168         expected_delta_per_poc_cycle = 0;
2169         for (i = 0; i < h->sps.poc_cycle_length; i++)
2170             // FIXME integrate during sps parse
2171             expected_delta_per_poc_cycle += h->sps.offset_for_ref_frame[i];
2172
2173         if (abs_frame_num > 0) {
2174             int poc_cycle_cnt          = (abs_frame_num - 1) / h->sps.poc_cycle_length;
2175             int frame_num_in_poc_cycle = (abs_frame_num - 1) % h->sps.poc_cycle_length;
2176
2177             expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
2178             for (i = 0; i <= frame_num_in_poc_cycle; i++)
2179                 expectedpoc = expectedpoc + h->sps.offset_for_ref_frame[i];
2180         } else
2181             expectedpoc = 0;
2182
2183         if (h->nal_ref_idc == 0)
2184             expectedpoc = expectedpoc + h->sps.offset_for_non_ref_pic;
2185
2186         field_poc[0] = expectedpoc + h->delta_poc[0];
2187         field_poc[1] = field_poc[0] + h->sps.offset_for_top_to_bottom_field;
2188
2189         if (s->picture_structure == PICT_FRAME)
2190             field_poc[1] += h->delta_poc[1];
2191     } else {
2192         int poc = 2 * (h->frame_num_offset + h->frame_num);
2193
2194         if (!h->nal_ref_idc)
2195             poc--;
2196
2197         field_poc[0] = poc;
2198         field_poc[1] = poc;
2199     }
2200
2201     if (s->picture_structure != PICT_BOTTOM_FIELD)
2202         s->current_picture_ptr->field_poc[0] = field_poc[0];
2203     if (s->picture_structure != PICT_TOP_FIELD)
2204         s->current_picture_ptr->field_poc[1] = field_poc[1];
2205     cur->poc = FFMIN(cur->field_poc[0], cur->field_poc[1]);
2206
2207     return 0;
2208 }
2209
2210 /**
2211  * initialize scan tables
2212  */
2213 static void init_scan_tables(H264Context *h)
2214 {
2215     int i;
2216     for (i = 0; i < 16; i++) {
2217 #define T(x) (x >> 2) | ((x << 2) & 0xF)
2218         h->zigzag_scan[i] = T(zigzag_scan[i]);
2219         h->field_scan[i]  = T(field_scan[i]);
2220 #undef T
2221     }
2222     for (i = 0; i < 64; i++) {
2223 #define T(x) (x >> 3) | ((x & 7) << 3)
2224         h->zigzag_scan8x8[i]       = T(ff_zigzag_direct[i]);
2225         h->zigzag_scan8x8_cavlc[i] = T(zigzag_scan8x8_cavlc[i]);
2226         h->field_scan8x8[i]        = T(field_scan8x8[i]);
2227         h->field_scan8x8_cavlc[i]  = T(field_scan8x8_cavlc[i]);
2228 #undef T
2229     }
2230     if (h->sps.transform_bypass) { // FIXME same ugly
2231         memcpy(h->zigzag_scan_q0          , zigzag_scan             , sizeof(h->zigzag_scan_q0         ));
2232         memcpy(h->zigzag_scan8x8_q0       , ff_zigzag_direct        , sizeof(h->zigzag_scan8x8_q0      ));
2233         memcpy(h->zigzag_scan8x8_cavlc_q0 , zigzag_scan8x8_cavlc    , sizeof(h->zigzag_scan8x8_cavlc_q0));
2234         memcpy(h->field_scan_q0           , field_scan              , sizeof(h->field_scan_q0          ));
2235         memcpy(h->field_scan8x8_q0        , field_scan8x8           , sizeof(h->field_scan8x8_q0       ));
2236         memcpy(h->field_scan8x8_cavlc_q0  , field_scan8x8_cavlc     , sizeof(h->field_scan8x8_cavlc_q0 ));
2237     } else {
2238         memcpy(h->zigzag_scan_q0          , h->zigzag_scan          , sizeof(h->zigzag_scan_q0         ));
2239         memcpy(h->zigzag_scan8x8_q0       , h->zigzag_scan8x8       , sizeof(h->zigzag_scan8x8_q0      ));
2240         memcpy(h->zigzag_scan8x8_cavlc_q0 , h->zigzag_scan8x8_cavlc , sizeof(h->zigzag_scan8x8_cavlc_q0));
2241         memcpy(h->field_scan_q0           , h->field_scan           , sizeof(h->field_scan_q0          ));
2242         memcpy(h->field_scan8x8_q0        , h->field_scan8x8        , sizeof(h->field_scan8x8_q0       ));
2243         memcpy(h->field_scan8x8_cavlc_q0  , h->field_scan8x8_cavlc  , sizeof(h->field_scan8x8_cavlc_q0 ));
2244     }
2245 }
2246
2247 static int field_end(H264Context *h, int in_setup)
2248 {
2249     MpegEncContext *const s     = &h->s;
2250     AVCodecContext *const avctx = s->avctx;
2251     int err = 0;
2252     s->mb_y = 0;
2253
2254     if (!in_setup && !s->dropable)
2255         ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX,
2256                                   s->picture_structure == PICT_BOTTOM_FIELD);
2257
2258     if (CONFIG_H264_VDPAU_DECODER &&
2259         s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2260         ff_vdpau_h264_set_reference_frames(s);
2261
2262     if (in_setup || !(avctx->active_thread_type & FF_THREAD_FRAME)) {
2263         if (!s->dropable) {
2264             err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
2265             h->prev_poc_msb = h->poc_msb;
2266             h->prev_poc_lsb = h->poc_lsb;
2267         }
2268         h->prev_frame_num_offset = h->frame_num_offset;
2269         h->prev_frame_num        = h->frame_num;
2270         h->outputed_poc          = h->next_outputed_poc;
2271     }
2272
2273     if (avctx->hwaccel) {
2274         if (avctx->hwaccel->end_frame(avctx) < 0)
2275             av_log(avctx, AV_LOG_ERROR,
2276                    "hardware accelerator failed to decode picture\n");
2277     }
2278
2279     if (CONFIG_H264_VDPAU_DECODER &&
2280         s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2281         ff_vdpau_h264_picture_complete(s);
2282
2283     /*
2284      * FIXME: Error handling code does not seem to support interlaced
2285      * when slices span multiple rows
2286      * The ff_er_add_slice calls don't work right for bottom
2287      * fields; they cause massive erroneous error concealing
2288      * Error marking covers both fields (top and bottom).
2289      * This causes a mismatched s->error_count
2290      * and a bad error table. Further, the error count goes to
2291      * INT_MAX when called for bottom field, because mb_y is
2292      * past end by one (callers fault) and resync_mb_y != 0
2293      * causes problems for the first MB line, too.
2294      */
2295     if (!FIELD_PICTURE)
2296         ff_er_frame_end(s);
2297
2298     ff_MPV_frame_end(s);
2299
2300     h->current_slice = 0;
2301
2302     return err;
2303 }
2304
2305 /**
2306  * Replicate H264 "master" context to thread contexts.
2307  */
2308 static void clone_slice(H264Context *dst, H264Context *src)
2309 {
2310     memcpy(dst->block_offset, src->block_offset, sizeof(dst->block_offset));
2311     dst->s.current_picture_ptr = src->s.current_picture_ptr;
2312     dst->s.current_picture     = src->s.current_picture;
2313     dst->s.linesize            = src->s.linesize;
2314     dst->s.uvlinesize          = src->s.uvlinesize;
2315     dst->s.first_field         = src->s.first_field;
2316
2317     dst->prev_poc_msb          = src->prev_poc_msb;
2318     dst->prev_poc_lsb          = src->prev_poc_lsb;
2319     dst->prev_frame_num_offset = src->prev_frame_num_offset;
2320     dst->prev_frame_num        = src->prev_frame_num;
2321     dst->short_ref_count       = src->short_ref_count;
2322
2323     memcpy(dst->short_ref,        src->short_ref,        sizeof(dst->short_ref));
2324     memcpy(dst->long_ref,         src->long_ref,         sizeof(dst->long_ref));
2325     memcpy(dst->default_ref_list, src->default_ref_list, sizeof(dst->default_ref_list));
2326     memcpy(dst->ref_list,         src->ref_list,         sizeof(dst->ref_list));
2327
2328     memcpy(dst->dequant4_coeff,   src->dequant4_coeff,   sizeof(src->dequant4_coeff));
2329     memcpy(dst->dequant8_coeff,   src->dequant8_coeff,   sizeof(src->dequant8_coeff));
2330 }
2331
2332 /**
2333  * Compute profile from profile_idc and constraint_set?_flags.
2334  *
2335  * @param sps SPS
2336  *
2337  * @return profile as defined by FF_PROFILE_H264_*
2338  */
2339 int ff_h264_get_profile(SPS *sps)
2340 {
2341     int profile = sps->profile_idc;
2342
2343     switch (sps->profile_idc) {
2344     case FF_PROFILE_H264_BASELINE:
2345         // constraint_set1_flag set to 1
2346         profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
2347         break;
2348     case FF_PROFILE_H264_HIGH_10:
2349     case FF_PROFILE_H264_HIGH_422:
2350     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
2351         // constraint_set3_flag set to 1
2352         profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
2353         break;
2354     }
2355
2356     return profile;
2357 }
2358
2359 /**
2360  * Decode a slice header.
2361  * This will also call ff_MPV_common_init() and frame_start() as needed.
2362  *
2363  * @param h h264context
2364  * @param h0 h264 master context (differs from 'h' when doing sliced based
2365  *           parallel decoding)
2366  *
2367  * @return 0 if okay, <0 if an error occurred, 1 if decoding must not be multithreaded
2368  */
2369 static int decode_slice_header(H264Context *h, H264Context *h0)
2370 {
2371     MpegEncContext *const s  = &h->s;
2372     MpegEncContext *const s0 = &h0->s;
2373     unsigned int first_mb_in_slice;
2374     unsigned int pps_id;
2375     int num_ref_idx_active_override_flag;
2376     unsigned int slice_type, tmp, i, j;
2377     int default_ref_list_done = 0;
2378     int last_pic_structure, last_pic_dropable;
2379     int must_reinit;
2380
2381     /* FIXME: 2tap qpel isn't implemented for high bit depth. */
2382     if ((s->avctx->flags2 & CODEC_FLAG2_FAST) &&
2383         !h->nal_ref_idc && !h->pixel_shift) {
2384         s->me.qpel_put = s->dsp.put_2tap_qpel_pixels_tab;
2385         s->me.qpel_avg = s->dsp.avg_2tap_qpel_pixels_tab;
2386     } else {
2387         s->me.qpel_put = s->dsp.put_h264_qpel_pixels_tab;
2388         s->me.qpel_avg = s->dsp.avg_h264_qpel_pixels_tab;
2389     }
2390
2391     first_mb_in_slice = get_ue_golomb_long(&s->gb);
2392
2393     if (first_mb_in_slice == 0) { // FIXME better field boundary detection
2394         if (h0->current_slice && FIELD_PICTURE) {
2395             field_end(h, 1);
2396         }
2397
2398         h0->current_slice = 0;
2399         if (!s0->first_field) {
2400             if (s->current_picture_ptr && !s->dropable &&
2401                 s->current_picture_ptr->owner2 == s) {
2402                 ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX,
2403                                           s->picture_structure == PICT_BOTTOM_FIELD);
2404             }
2405             s->current_picture_ptr = NULL;
2406         }
2407     }
2408
2409     slice_type = get_ue_golomb_31(&s->gb);
2410     if (slice_type > 9) {
2411         av_log(h->s.avctx, AV_LOG_ERROR,
2412                "slice type too large (%d) at %d %d\n",
2413                slice_type, s->mb_x, s->mb_y);
2414         return -1;
2415     }
2416     if (slice_type > 4) {
2417         slice_type -= 5;
2418         h->slice_type_fixed = 1;
2419     } else
2420         h->slice_type_fixed = 0;
2421
2422     slice_type = golomb_to_pict_type[slice_type];
2423     if (slice_type == AV_PICTURE_TYPE_I ||
2424         (h0->current_slice != 0 && slice_type == h0->last_slice_type)) {
2425         default_ref_list_done = 1;
2426     }
2427     h->slice_type     = slice_type;
2428     h->slice_type_nos = slice_type & 3;
2429
2430     // to make a few old functions happy, it's wrong though
2431     s->pict_type = h->slice_type;
2432
2433     pps_id = get_ue_golomb(&s->gb);
2434     if (pps_id >= MAX_PPS_COUNT) {
2435         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id %d out of range\n", pps_id);
2436         return -1;
2437     }
2438     if (!h0->pps_buffers[pps_id]) {
2439         av_log(h->s.avctx, AV_LOG_ERROR,
2440                "non-existing PPS %u referenced\n",
2441                pps_id);
2442         return -1;
2443     }
2444     h->pps = *h0->pps_buffers[pps_id];
2445
2446     if (!h0->sps_buffers[h->pps.sps_id]) {
2447         av_log(h->s.avctx, AV_LOG_ERROR,
2448                "non-existing SPS %u referenced\n",
2449                h->pps.sps_id);
2450         return -1;
2451     }
2452     h->sps = *h0->sps_buffers[h->pps.sps_id];
2453
2454     s->avctx->profile = ff_h264_get_profile(&h->sps);
2455     s->avctx->level   = h->sps.level_idc;
2456     s->avctx->refs    = h->sps.ref_frame_count;
2457
2458     must_reinit = (s->context_initialized &&
2459                     (   16*h->sps.mb_width != s->avctx->coded_width
2460                      || 16*h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag) != s->avctx->coded_height
2461                      || s->avctx->bits_per_raw_sample != h->sps.bit_depth_luma
2462                      || h->cur_chroma_format_idc != h->sps.chroma_format_idc
2463                      || av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio)));
2464
2465     if(must_reinit && (h != h0 || (s->avctx->active_thread_type & FF_THREAD_FRAME))) {
2466         av_log_missing_feature(s->avctx,
2467                                 "Width/height/bit depth/chroma idc changing with threads", 0);
2468         return AVERROR_PATCHWELCOME;   // width / height changed during parallelized decoding
2469     }
2470
2471     s->mb_width  = h->sps.mb_width;
2472     s->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
2473
2474     h->b_stride = s->mb_width * 4;
2475
2476     s->chroma_y_shift = h->sps.chroma_format_idc <= 1; // 400 uses yuv420p
2477
2478     s->width  = 16 * s->mb_width;
2479     s->height = 16 * s->mb_height;
2480
2481     if(must_reinit) {
2482         free_tables(h, 0);
2483         flush_dpb(s->avctx);
2484         ff_MPV_common_end(s);
2485         h->list_count = 0;
2486         h->current_slice = 0;
2487     }
2488     if (!s->context_initialized) {
2489         if (h != h0) {
2490             av_log(h->s.avctx, AV_LOG_ERROR,
2491                    "Cannot (re-)initialize context during parallel decoding.\n");
2492             return -1;
2493         }
2494         if(   FFALIGN(s->avctx->width , 16                                 ) == s->width
2495            && FFALIGN(s->avctx->height, 16*(2 - h->sps.frame_mbs_only_flag)) == s->height
2496            && !h->sps.crop_right && !h->sps.crop_bottom
2497            && (s->avctx->width != s->width || s->avctx->height && s->height)
2498         ) {
2499             av_log(h->s.avctx, AV_LOG_DEBUG, "Using externally provided dimensions\n");
2500             s->avctx->coded_width  = s->width;
2501             s->avctx->coded_height = s->height;
2502         } else{
2503             avcodec_set_dimensions(s->avctx, s->width, s->height);
2504             s->avctx->width  -= (2>>CHROMA444)*FFMIN(h->sps.crop_right, (8<<CHROMA444)-1);
2505             s->avctx->height -= (1<<s->chroma_y_shift)*FFMIN(h->sps.crop_bottom, (16>>s->chroma_y_shift)-1) * (2 - h->sps.frame_mbs_only_flag);
2506         }
2507         s->avctx->sample_aspect_ratio = h->sps.sar;
2508         av_assert0(s->avctx->sample_aspect_ratio.den);
2509
2510         if (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU
2511             && (h->sps.bit_depth_luma != 8 ||
2512                 h->sps.chroma_format_idc > 1)) {
2513             av_log(s->avctx, AV_LOG_ERROR,
2514                    "VDPAU decoding does not support video "
2515                    "colorspace\n");
2516             return -1;
2517         }
2518
2519         if (s->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
2520             h->cur_chroma_format_idc != h->sps.chroma_format_idc) {
2521             if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 14 && h->sps.bit_depth_luma != 11 && h->sps.bit_depth_luma != 13 &&
2522                 (h->sps.bit_depth_luma != 9 || !CHROMA422)) {
2523                 s->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
2524                 h->cur_chroma_format_idc = h->sps.chroma_format_idc;
2525                 h->pixel_shift = h->sps.bit_depth_luma > 8;
2526
2527                 ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma, h->sps.chroma_format_idc);
2528                 ff_h264_pred_init(&h->hpc, s->codec_id, h->sps.bit_depth_luma, h->sps.chroma_format_idc);
2529                 s->dsp.dct_bits = h->sps.bit_depth_luma > 8 ? 32 : 16;
2530                 ff_dsputil_init(&s->dsp, s->avctx);
2531             } else {
2532                 av_log(s->avctx, AV_LOG_ERROR, "Unsupported bit depth: %d chroma_idc: %d\n",
2533                        h->sps.bit_depth_luma, h->sps.chroma_format_idc);
2534                 return -1;
2535             }
2536         }
2537
2538         if (h->sps.video_signal_type_present_flag) {
2539             s->avctx->color_range = h->sps.full_range>0 ? AVCOL_RANGE_JPEG
2540                                                       : AVCOL_RANGE_MPEG;
2541             if (h->sps.colour_description_present_flag) {
2542                 s->avctx->color_primaries = h->sps.color_primaries;
2543                 s->avctx->color_trc       = h->sps.color_trc;
2544                 s->avctx->colorspace      = h->sps.colorspace;
2545             }
2546         }
2547
2548         if (h->sps.timing_info_present_flag) {
2549             int64_t den = h->sps.time_scale;
2550             if (h->x264_build < 44U)
2551                 den *= 2;
2552             av_reduce(&s->avctx->time_base.num, &s->avctx->time_base.den,
2553                       h->sps.num_units_in_tick, den, 1 << 30);
2554         }
2555
2556         switch (h->sps.bit_depth_luma) {
2557         case 9:
2558             if (CHROMA444) {
2559                 if (s->avctx->colorspace == AVCOL_SPC_RGB) {
2560                     s->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
2561                 } else
2562                     s->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
2563             } else if (CHROMA422)
2564                 s->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
2565             else
2566                 s->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
2567             break;
2568         case 10:
2569             if (CHROMA444) {
2570                 if (s->avctx->colorspace == AVCOL_SPC_RGB) {
2571                     s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
2572                 } else
2573                     s->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
2574             } else if (CHROMA422)
2575                 s->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
2576             else
2577                 s->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
2578             break;
2579         case 12:
2580             if (CHROMA444) {
2581                 if (s->avctx->colorspace == AVCOL_SPC_RGB) {
2582                     s->avctx->pix_fmt = AV_PIX_FMT_GBRP12;
2583                 } else
2584                     s->avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
2585             } else if (CHROMA422)
2586                 s->avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
2587             else
2588                 s->avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
2589             break;
2590         case 14:
2591             if (CHROMA444) {
2592                 if (s->avctx->colorspace == AVCOL_SPC_RGB) {
2593                     s->avctx->pix_fmt = AV_PIX_FMT_GBRP14;
2594                 } else
2595                     s->avctx->pix_fmt = AV_PIX_FMT_YUV444P14;
2596             } else if (CHROMA422)
2597                 s->avctx->pix_fmt = AV_PIX_FMT_YUV422P14;
2598             else
2599                 s->avctx->pix_fmt = AV_PIX_FMT_YUV420P14;
2600             break;
2601         case 8:
2602             if (CHROMA444) {
2603                     s->avctx->pix_fmt = s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ444P
2604                                                                                   : AV_PIX_FMT_YUV444P;
2605                     if (s->avctx->colorspace == AVCOL_SPC_RGB) {
2606                         s->avctx->pix_fmt = AV_PIX_FMT_GBR24P;
2607                         av_log(h->s.avctx, AV_LOG_DEBUG, "Detected GBR colorspace.\n");
2608                     } else if (s->avctx->colorspace == AVCOL_SPC_YCGCO) {
2609                         av_log(h->s.avctx, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
2610                     }
2611             } else if (CHROMA422) {
2612                 s->avctx->pix_fmt = s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ422P
2613                                                                               : AV_PIX_FMT_YUV422P;
2614             } else {
2615                 s->avctx->pix_fmt = s->avctx->get_format(s->avctx,
2616                                                          s->avctx->codec->pix_fmts ?
2617                                                          s->avctx->codec->pix_fmts :
2618                                                          s->avctx->color_range == AVCOL_RANGE_JPEG ?
2619                                                          hwaccel_pixfmt_list_h264_jpeg_420 :
2620                                                          ff_hwaccel_pixfmt_list_420);
2621             }
2622             break;
2623         default:
2624             av_log(s->avctx, AV_LOG_ERROR,
2625                    "Unsupported bit depth: %d\n", h->sps.bit_depth_luma);
2626             return AVERROR_INVALIDDATA;
2627         }
2628
2629         s->avctx->hwaccel = ff_find_hwaccel(s->avctx->codec->id,
2630                                             s->avctx->pix_fmt);
2631
2632         if (ff_MPV_common_init(s) < 0) {
2633             av_log(h->s.avctx, AV_LOG_ERROR, "ff_MPV_common_init() failed.\n");
2634             return -1;
2635         }
2636         s->first_field = 0;
2637         h->prev_interlaced_frame = 1;
2638
2639         init_scan_tables(h);
2640         if (ff_h264_alloc_tables(h) < 0) {
2641             av_log(h->s.avctx, AV_LOG_ERROR,
2642                    "Could not allocate memory for h264\n");
2643             return AVERROR(ENOMEM);
2644         }
2645
2646         if (!HAVE_THREADS || !(s->avctx->active_thread_type & FF_THREAD_SLICE)) {
2647             if (context_init(h) < 0) {
2648                 av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");
2649                 return -1;
2650             }
2651         } else {
2652             for (i = 1; i < s->slice_context_count; i++) {
2653                 H264Context *c;
2654                 c = h->thread_context[i] = av_malloc(sizeof(H264Context));
2655                 memcpy(c, h->s.thread_context[i], sizeof(MpegEncContext));
2656                 memset(&c->s + 1, 0, sizeof(H264Context) - sizeof(MpegEncContext));
2657                 c->h264dsp     = h->h264dsp;
2658                 c->sps         = h->sps;
2659                 c->pps         = h->pps;
2660                 c->pixel_shift = h->pixel_shift;
2661                 c->cur_chroma_format_idc = h->cur_chroma_format_idc;
2662                 init_scan_tables(c);
2663                 clone_tables(c, h, i);
2664             }
2665
2666             for (i = 0; i < s->slice_context_count; i++)
2667                 if (context_init(h->thread_context[i]) < 0) {
2668                     av_log(h->s.avctx, AV_LOG_ERROR,
2669                            "context_init() failed.\n");
2670                     return -1;
2671                 }
2672         }
2673     }
2674
2675     if (h == h0 && h->dequant_coeff_pps != pps_id) {
2676         h->dequant_coeff_pps = pps_id;
2677         init_dequant_tables(h);
2678     }
2679
2680     h->frame_num = get_bits(&s->gb, h->sps.log2_max_frame_num);
2681
2682     h->mb_mbaff        = 0;
2683     h->mb_aff_frame    = 0;
2684     last_pic_structure = s0->picture_structure;
2685     last_pic_dropable  = s->dropable;
2686     s->dropable        = h->nal_ref_idc == 0;
2687     if (h->sps.frame_mbs_only_flag) {
2688         s->picture_structure = PICT_FRAME;
2689     } else {
2690         if (!h->sps.direct_8x8_inference_flag && slice_type == AV_PICTURE_TYPE_B) {
2691             av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
2692             return -1;
2693         }
2694         if (get_bits1(&s->gb)) { // field_pic_flag
2695             s->picture_structure = PICT_TOP_FIELD + get_bits1(&s->gb); // bottom_field_flag
2696         } else {
2697             s->picture_structure = PICT_FRAME;
2698             h->mb_aff_frame      = h->sps.mb_aff;
2699         }
2700     }
2701     h->mb_field_decoding_flag = s->picture_structure != PICT_FRAME;
2702
2703     if (h0->current_slice != 0) {
2704         if (last_pic_structure != s->picture_structure ||
2705             last_pic_dropable  != s->dropable) {
2706             av_log(h->s.avctx, AV_LOG_ERROR,
2707                    "Changing field mode (%d -> %d) between slices is not allowed\n",
2708                    last_pic_structure, s->picture_structure);
2709             s->picture_structure = last_pic_structure;
2710             s->dropable          = last_pic_dropable;
2711             return AVERROR_INVALIDDATA;
2712         }
2713     } else {
2714         /* Shorten frame num gaps so we don't have to allocate reference
2715          * frames just to throw them away */
2716         if (h->frame_num != h->prev_frame_num && h->prev_frame_num >= 0) {
2717             int unwrap_prev_frame_num = h->prev_frame_num;
2718             int max_frame_num         = 1 << h->sps.log2_max_frame_num;
2719
2720             if (unwrap_prev_frame_num > h->frame_num)
2721                 unwrap_prev_frame_num -= max_frame_num;
2722
2723             if ((h->frame_num - unwrap_prev_frame_num) > h->sps.ref_frame_count) {
2724                 unwrap_prev_frame_num = (h->frame_num - h->sps.ref_frame_count) - 1;
2725                 if (unwrap_prev_frame_num < 0)
2726                     unwrap_prev_frame_num += max_frame_num;
2727
2728                 h->prev_frame_num = unwrap_prev_frame_num;
2729             }
2730         }
2731
2732         /* See if we have a decoded first field looking for a pair...
2733          * Here, we're using that to see if we should mark previously
2734          * decode frames as "finished".
2735          * We have to do that before the "dummy" in-between frame allocation,
2736          * since that can modify s->current_picture_ptr. */
2737         if (s0->first_field) {
2738             assert(s0->current_picture_ptr);
2739             assert(s0->current_picture_ptr->f.data[0]);
2740             assert(s0->current_picture_ptr->f.reference != DELAYED_PIC_REF);
2741
2742             /* Mark old field/frame as completed */
2743             if (!last_pic_dropable && s0->current_picture_ptr->owner2 == s0) {
2744                 ff_thread_report_progress(&s0->current_picture_ptr->f, INT_MAX,
2745                                           last_pic_structure == PICT_BOTTOM_FIELD);
2746             }
2747
2748             /* figure out if we have a complementary field pair */
2749             if (!FIELD_PICTURE || s->picture_structure == last_pic_structure) {
2750                 /* Previous field is unmatched. Don't display it, but let it
2751                  * remain for reference if marked as such. */
2752                 if (!last_pic_dropable && last_pic_structure != PICT_FRAME) {
2753                     ff_thread_report_progress(&s0->current_picture_ptr->f, INT_MAX,
2754                                               last_pic_structure == PICT_TOP_FIELD);
2755                 }
2756             } else {
2757                 if (s0->current_picture_ptr->frame_num != h->frame_num) {
2758                     /* This and previous field were reference, but had
2759                      * different frame_nums. Consider this field first in
2760                      * pair. Throw away previous field except for reference
2761                      * purposes. */
2762                     if (!last_pic_dropable && last_pic_structure != PICT_FRAME) {
2763                         ff_thread_report_progress(&s0->current_picture_ptr->f, INT_MAX,
2764                                                   last_pic_structure == PICT_TOP_FIELD);
2765                     }
2766                 } else {
2767                     /* Second field in complementary pair */
2768                     if (!((last_pic_structure   == PICT_TOP_FIELD &&
2769                            s->picture_structure == PICT_BOTTOM_FIELD) ||
2770                           (last_pic_structure   == PICT_BOTTOM_FIELD &&
2771                            s->picture_structure == PICT_TOP_FIELD))) {
2772                         av_log(s->avctx, AV_LOG_ERROR,
2773                                "Invalid field mode combination %d/%d\n",
2774                                last_pic_structure, s->picture_structure);
2775                         s->picture_structure = last_pic_structure;
2776                         s->dropable          = last_pic_dropable;
2777                         return AVERROR_INVALIDDATA;
2778                     } else if (last_pic_dropable != s->dropable) {
2779                         av_log(s->avctx, AV_LOG_ERROR,
2780                                "Cannot combine reference and non-reference fields in the same frame\n");
2781                         av_log_ask_for_sample(s->avctx, NULL);
2782                         s->picture_structure = last_pic_structure;
2783                         s->dropable          = last_pic_dropable;
2784                         return AVERROR_INVALIDDATA;
2785                     }
2786
2787                     /* Take ownership of this buffer. Note that if another thread owned
2788                      * the first field of this buffer, we're not operating on that pointer,
2789                      * so the original thread is still responsible for reporting progress
2790                      * on that first field (or if that was us, we just did that above).
2791                      * By taking ownership, we assign responsibility to ourselves to
2792                      * report progress on the second field. */
2793                     s0->current_picture_ptr->owner2 = s0;
2794                 }
2795             }
2796         }
2797
2798         while (h->frame_num != h->prev_frame_num && h->prev_frame_num >= 0 &&
2799                h->frame_num != (h->prev_frame_num + 1) % (1 << h->sps.log2_max_frame_num)) {
2800             Picture *prev = h->short_ref_count ? h->short_ref[0] : NULL;
2801             av_log(h->s.avctx, AV_LOG_DEBUG, "Frame num gap %d %d\n",
2802                    h->frame_num, h->prev_frame_num);
2803             if (ff_h264_frame_start(h) < 0)
2804                 return -1;
2805             h->prev_frame_num++;
2806             h->prev_frame_num %= 1 << h->sps.log2_max_frame_num;
2807             s->current_picture_ptr->frame_num = h->prev_frame_num;
2808             ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX, 0);
2809             ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX, 1);
2810             ff_generate_sliding_window_mmcos(h);
2811             if (ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index) < 0 &&
2812                 (s->avctx->err_recognition & AV_EF_EXPLODE))
2813                 return AVERROR_INVALIDDATA;
2814             /* Error concealment: if a ref is missing, copy the previous ref in its place.
2815              * FIXME: avoiding a memcpy would be nice, but ref handling makes many assumptions
2816              * about there being no actual duplicates.
2817              * FIXME: this doesn't copy padding for out-of-frame motion vectors.  Given we're
2818              * concealing a lost frame, this probably isn't noticeable by comparison, but it should
2819              * be fixed. */
2820             if (h->short_ref_count) {
2821                 if (prev) {
2822                     av_image_copy(h->short_ref[0]->f.data, h->short_ref[0]->f.linesize,
2823                                   (const uint8_t **)prev->f.data, prev->f.linesize,
2824                                   s->avctx->pix_fmt, s->mb_width * 16, s->mb_height * 16);
2825                     h->short_ref[0]->poc = prev->poc + 2;
2826                 }
2827                 h->short_ref[0]->frame_num = h->prev_frame_num;
2828             }
2829         }
2830
2831         /* See if we have a decoded first field looking for a pair...
2832          * We're using that to see whether to continue decoding in that
2833          * frame, or to allocate a new one. */
2834         if (s0->first_field) {
2835             assert(s0->current_picture_ptr);
2836             assert(s0->current_picture_ptr->f.data[0]);
2837             assert(s0->current_picture_ptr->f.reference != DELAYED_PIC_REF);
2838
2839             /* figure out if we have a complementary field pair */
2840             if (!FIELD_PICTURE || s->picture_structure == last_pic_structure) {
2841                 /* Previous field is unmatched. Don't display it, but let it
2842                  * remain for reference if marked as such. */
2843                 s0->current_picture_ptr = NULL;
2844                 s0->first_field         = FIELD_PICTURE;
2845             } else {
2846                 if (s0->current_picture_ptr->frame_num != h->frame_num) {
2847                     ff_thread_report_progress((AVFrame*)s0->current_picture_ptr, INT_MAX,
2848                                               s0->picture_structure==PICT_BOTTOM_FIELD);
2849                     /* This and the previous field had different frame_nums.
2850                      * Consider this field first in pair. Throw away previous
2851                      * one except for reference purposes. */
2852                     s0->first_field         = 1;
2853                     s0->current_picture_ptr = NULL;
2854                 } else {
2855                     /* Second field in complementary pair */
2856                     s0->first_field = 0;
2857                 }
2858             }
2859         } else {
2860             /* Frame or first field in a potentially complementary pair */
2861             s0->first_field = FIELD_PICTURE;
2862         }
2863
2864         if (!FIELD_PICTURE || s0->first_field) {
2865             if (ff_h264_frame_start(h) < 0) {
2866                 s0->first_field = 0;
2867                 return -1;
2868             }
2869         } else {
2870             ff_release_unused_pictures(s, 0);
2871         }
2872     }
2873     if (h != h0)
2874         clone_slice(h, h0);
2875
2876     s->current_picture_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup
2877
2878     av_assert1(s->mb_num == s->mb_width * s->mb_height);
2879     if (first_mb_in_slice << FIELD_OR_MBAFF_PICTURE >= s->mb_num ||
2880         first_mb_in_slice >= s->mb_num) {
2881         av_log(h->s.avctx, AV_LOG_ERROR, "first_mb_in_slice overflow\n");
2882         return -1;
2883     }
2884     s->resync_mb_x = s->mb_x =  first_mb_in_slice % s->mb_width;
2885     s->resync_mb_y = s->mb_y = (first_mb_in_slice / s->mb_width) << FIELD_OR_MBAFF_PICTURE;
2886     if (s->picture_structure == PICT_BOTTOM_FIELD)
2887         s->resync_mb_y = s->mb_y = s->mb_y + 1;
2888     av_assert1(s->mb_y < s->mb_height);
2889
2890     if (s->picture_structure == PICT_FRAME) {
2891         h->curr_pic_num = h->frame_num;
2892         h->max_pic_num  = 1 << h->sps.log2_max_frame_num;
2893     } else {
2894         h->curr_pic_num = 2 * h->frame_num + 1;
2895         h->max_pic_num  = 1 << (h->sps.log2_max_frame_num + 1);
2896     }
2897
2898     if (h->nal_unit_type == NAL_IDR_SLICE)
2899         get_ue_golomb(&s->gb); /* idr_pic_id */
2900
2901     if (h->sps.poc_type == 0) {
2902         h->poc_lsb = get_bits(&s->gb, h->sps.log2_max_poc_lsb);
2903
2904         if (h->pps.pic_order_present == 1 && s->picture_structure == PICT_FRAME)
2905             h->delta_poc_bottom = get_se_golomb(&s->gb);
2906     }
2907
2908     if (h->sps.poc_type == 1 && !h->sps.delta_pic_order_always_zero_flag) {
2909         h->delta_poc[0] = get_se_golomb(&s->gb);
2910
2911         if (h->pps.pic_order_present == 1 && s->picture_structure == PICT_FRAME)
2912             h->delta_poc[1] = get_se_golomb(&s->gb);
2913     }
2914
2915     init_poc(h);
2916
2917     if (h->pps.redundant_pic_cnt_present)
2918         h->redundant_pic_count = get_ue_golomb(&s->gb);
2919
2920     // set defaults, might be overridden a few lines later
2921     h->ref_count[0] = h->pps.ref_count[0];
2922     h->ref_count[1] = h->pps.ref_count[1];
2923
2924     if (h->slice_type_nos != AV_PICTURE_TYPE_I) {
2925         unsigned max[2];
2926         max[0] = max[1] = s->picture_structure == PICT_FRAME ? 15 : 31;
2927
2928         if (h->slice_type_nos == AV_PICTURE_TYPE_B)
2929             h->direct_spatial_mv_pred = get_bits1(&s->gb);
2930         num_ref_idx_active_override_flag = get_bits1(&s->gb);
2931
2932         if (num_ref_idx_active_override_flag) {
2933             h->ref_count[0] = get_ue_golomb(&s->gb) + 1;
2934             if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
2935                 h->ref_count[1] = get_ue_golomb(&s->gb) + 1;
2936             } else
2937                 // full range is spec-ok in this case, even for frames
2938                 h->ref_count[1] = 1;
2939         }
2940
2941         if (h->ref_count[0]-1 > max[0] || h->ref_count[1]-1 > max[1]){
2942             av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n", h->ref_count[0]-1, max[0], h->ref_count[1]-1, max[1]);
2943             h->ref_count[0] = h->ref_count[1] = 1;
2944             return AVERROR_INVALIDDATA;
2945         }
2946
2947         if (h->slice_type_nos == AV_PICTURE_TYPE_B)
2948             h->list_count = 2;
2949         else
2950             h->list_count = 1;
2951     } else
2952         h->ref_count[1]= h->ref_count[0]= h->list_count= 0;
2953
2954     if (!default_ref_list_done)
2955         ff_h264_fill_default_ref_list(h);
2956
2957     if (h->slice_type_nos != AV_PICTURE_TYPE_I &&
2958         ff_h264_decode_ref_pic_list_reordering(h) < 0) {
2959         h->ref_count[1] = h->ref_count[0] = 0;
2960         return -1;
2961     }
2962
2963     if (h->slice_type_nos != AV_PICTURE_TYPE_I) {
2964         s->last_picture_ptr = &h->ref_list[0][0];
2965         s->last_picture_ptr->owner2 = s;
2966         ff_copy_picture(&s->last_picture, s->last_picture_ptr);
2967     }
2968     if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
2969         s->next_picture_ptr = &h->ref_list[1][0];
2970         s->next_picture_ptr->owner2 = s;
2971         ff_copy_picture(&s->next_picture, s->next_picture_ptr);
2972     }
2973
2974     if ((h->pps.weighted_pred && h->slice_type_nos == AV_PICTURE_TYPE_P) ||
2975         (h->pps.weighted_bipred_idc == 1 &&
2976          h->slice_type_nos == AV_PICTURE_TYPE_B))
2977         pred_weight_table(h);
2978     else if (h->pps.weighted_bipred_idc == 2 &&
2979              h->slice_type_nos == AV_PICTURE_TYPE_B) {
2980         implicit_weight_table(h, -1);
2981     } else {
2982         h->use_weight = 0;
2983         for (i = 0; i < 2; i++) {
2984             h->luma_weight_flag[i]   = 0;
2985             h->chroma_weight_flag[i] = 0;
2986         }
2987     }
2988
2989     if (h->nal_ref_idc && ff_h264_decode_ref_pic_marking(h0, &s->gb) < 0 &&
2990         (s->avctx->err_recognition & AV_EF_EXPLODE))
2991         return AVERROR_INVALIDDATA;
2992
2993     if (FRAME_MBAFF) {
2994         ff_h264_fill_mbaff_ref_list(h);
2995
2996         if (h->pps.weighted_bipred_idc == 2 && h->slice_type_nos == AV_PICTURE_TYPE_B) {
2997             implicit_weight_table(h, 0);
2998             implicit_weight_table(h, 1);
2999         }
3000     }
3001
3002     if (h->slice_type_nos == AV_PICTURE_TYPE_B && !h->direct_spatial_mv_pred)
3003         ff_h264_direct_dist_scale_factor(h);
3004     ff_h264_direct_ref_list_init(h);
3005
3006     if (h->slice_type_nos != AV_PICTURE_TYPE_I && h->pps.cabac) {
3007         tmp = get_ue_golomb_31(&s->gb);
3008         if (tmp > 2) {
3009             av_log(s->avctx, AV_LOG_ERROR, "cabac_init_idc overflow\n");
3010             return -1;
3011         }
3012         h->cabac_init_idc = tmp;
3013     }
3014
3015     h->last_qscale_diff = 0;
3016     tmp = h->pps.init_qp + get_se_golomb(&s->gb);
3017     if (tmp > 51 + 6 * (h->sps.bit_depth_luma - 8)) {
3018         av_log(s->avctx, AV_LOG_ERROR, "QP %u out of range\n", tmp);
3019         return -1;
3020     }
3021     s->qscale       = tmp;
3022     h->chroma_qp[0] = get_chroma_qp(h, 0, s->qscale);
3023     h->chroma_qp[1] = get_chroma_qp(h, 1, s->qscale);
3024     // FIXME qscale / qp ... stuff
3025     if (h->slice_type == AV_PICTURE_TYPE_SP)
3026         get_bits1(&s->gb); /* sp_for_switch_flag */
3027     if (h->slice_type == AV_PICTURE_TYPE_SP ||
3028         h->slice_type == AV_PICTURE_TYPE_SI)
3029         get_se_golomb(&s->gb); /* slice_qs_delta */
3030
3031     h->deblocking_filter     = 1;
3032     h->slice_alpha_c0_offset = 52;
3033     h->slice_beta_offset     = 52;
3034     if (h->pps.deblocking_filter_parameters_present) {
3035         tmp = get_ue_golomb_31(&s->gb);
3036         if (tmp > 2) {
3037             av_log(s->avctx, AV_LOG_ERROR,
3038                    "deblocking_filter_idc %u out of range\n", tmp);
3039             return -1;
3040         }
3041         h->deblocking_filter = tmp;
3042         if (h->deblocking_filter < 2)
3043             h->deblocking_filter ^= 1;  // 1<->0
3044
3045         if (h->deblocking_filter) {
3046             h->slice_alpha_c0_offset += get_se_golomb(&s->gb) << 1;
3047             h->slice_beta_offset     += get_se_golomb(&s->gb) << 1;
3048             if (h->slice_alpha_c0_offset > 104U ||
3049                 h->slice_beta_offset     > 104U) {
3050                 av_log(s->avctx, AV_LOG_ERROR,
3051                        "deblocking filter parameters %d %d out of range\n",
3052                        h->slice_alpha_c0_offset, h->slice_beta_offset);
3053                 return -1;
3054             }
3055         }
3056     }
3057
3058     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
3059         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY &&
3060          h->slice_type_nos != AV_PICTURE_TYPE_I) ||
3061         (s->avctx->skip_loop_filter >= AVDISCARD_BIDIR  &&
3062          h->slice_type_nos == AV_PICTURE_TYPE_B) ||
3063         (s->avctx->skip_loop_filter >= AVDISCARD_NONREF &&
3064          h->nal_ref_idc == 0))
3065         h->deblocking_filter = 0;
3066
3067     if (h->deblocking_filter == 1 && h0->max_contexts > 1) {
3068         if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
3069             /* Cheat slightly for speed:
3070              * Do not bother to deblock across slices. */
3071             h->deblocking_filter = 2;
3072         } else {
3073             h0->max_contexts = 1;
3074             if (!h0->single_decode_warning) {
3075                 av_log(s->avctx, AV_LOG_INFO,
3076                        "Cannot parallelize deblocking type 1, decoding such frames in sequential order\n");
3077                 h0->single_decode_warning = 1;
3078             }
3079             if (h != h0) {
3080                 av_log(h->s.avctx, AV_LOG_ERROR,
3081                        "Deblocking switched inside frame.\n");
3082                 return 1;
3083             }
3084         }
3085     }
3086     h->qp_thresh = 15 + 52 -
3087                    FFMIN(h->slice_alpha_c0_offset, h->slice_beta_offset) -
3088                    FFMAX3(0,
3089                           h->pps.chroma_qp_index_offset[0],
3090                           h->pps.chroma_qp_index_offset[1]) +
3091                    6 * (h->sps.bit_depth_luma - 8);
3092
3093     h0->last_slice_type = slice_type;
3094     h->slice_num = ++h0->current_slice;
3095
3096     if (h->slice_num)
3097         h0->slice_row[(h->slice_num-1)&(MAX_SLICES-1)]= s->resync_mb_y;
3098     if (   h0->slice_row[h->slice_num&(MAX_SLICES-1)] + 3 >= s->resync_mb_y
3099         && h0->slice_row[h->slice_num&(MAX_SLICES-1)] <= s->resync_mb_y
3100         && h->slice_num >= MAX_SLICES) {
3101         //in case of ASO this check needs to be updated depending on how we decide to assign slice numbers in this case
3102         av_log(s->avctx, AV_LOG_WARNING, "Possibly too many slices (%d >= %d), increase MAX_SLICES and recompile if there are artifacts\n", h->slice_num, MAX_SLICES);
3103     }
3104
3105     for (j = 0; j < 2; j++) {
3106         int id_list[16];
3107         int *ref2frm = h->ref2frm[h->slice_num & (MAX_SLICES - 1)][j];
3108         for (i = 0; i < 16; i++) {
3109             id_list[i] = 60;
3110             if (h->ref_list[j][i].f.data[0]) {
3111                 int k;
3112                 uint8_t *base = h->ref_list[j][i].f.base[0];
3113                 for (k = 0; k < h->short_ref_count; k++)
3114                     if (h->short_ref[k]->f.base[0] == base) {
3115                         id_list[i] = k;
3116                         break;
3117                     }
3118                 for (k = 0; k < h->long_ref_count; k++)
3119                     if (h->long_ref[k] && h->long_ref[k]->f.base[0] == base) {
3120                         id_list[i] = h->short_ref_count + k;
3121                         break;
3122                     }
3123             }
3124         }
3125
3126         ref2frm[0]     =
3127             ref2frm[1] = -1;
3128         for (i = 0; i < 16; i++)
3129             ref2frm[i + 2] = 4 * id_list[i] +
3130                              (h->ref_list[j][i].f.reference & 3);
3131         ref2frm[18 + 0]     =
3132             ref2frm[18 + 1] = -1;
3133         for (i = 16; i < 48; i++)
3134             ref2frm[i + 4] = 4 * id_list[(i - 16) >> 1] +
3135                              (h->ref_list[j][i].f.reference & 3);
3136     }
3137
3138     // FIXME: fix draw_edges + PAFF + frame threads
3139     h->emu_edge_width  = (s->flags & CODEC_FLAG_EMU_EDGE ||
3140                           (!h->sps.frame_mbs_only_flag &&
3141                            s->avctx->active_thread_type))
3142                          ? 0 : 16;
3143     h->emu_edge_height = (FRAME_MBAFF || FIELD_PICTURE) ? 0 : h->emu_edge_width;
3144
3145     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
3146         av_log(h->s.avctx, AV_LOG_DEBUG,
3147                "slice:%d %s mb:%d %c%s%s pps:%u frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d:%d:%d weight:%d%s %s\n",
3148                h->slice_num,
3149                (s->picture_structure == PICT_FRAME ? "F" : s->picture_structure == PICT_TOP_FIELD ? "T" : "B"),
3150                first_mb_in_slice,
3151                av_get_picture_type_char(h->slice_type),
3152                h->slice_type_fixed ? " fix" : "",
3153                h->nal_unit_type == NAL_IDR_SLICE ? " IDR" : "",
3154                pps_id, h->frame_num,
3155                s->current_picture_ptr->field_poc[0],
3156                s->current_picture_ptr->field_poc[1],
3157                h->ref_count[0], h->ref_count[1],
3158                s->qscale,
3159                h->deblocking_filter,
3160                h->slice_alpha_c0_offset / 2 - 26, h->slice_beta_offset / 2 - 26,
3161                h->use_weight,
3162                h->use_weight == 1 && h->use_weight_chroma ? "c" : "",
3163                h->slice_type == AV_PICTURE_TYPE_B ? (h->direct_spatial_mv_pred ? "SPAT" : "TEMP") : "");
3164     }
3165
3166     return 0;
3167 }
3168
3169 int ff_h264_get_slice_type(const H264Context *h)
3170 {
3171     switch (h->slice_type) {
3172     case AV_PICTURE_TYPE_P:
3173         return 0;
3174     case AV_PICTURE_TYPE_B:
3175         return 1;
3176     case AV_PICTURE_TYPE_I:
3177         return 2;
3178     case AV_PICTURE_TYPE_SP:
3179         return 3;
3180     case AV_PICTURE_TYPE_SI:
3181         return 4;
3182     default:
3183         return -1;
3184     }
3185 }
3186
3187 static av_always_inline void fill_filter_caches_inter(H264Context *h,
3188                                                       MpegEncContext *const s,
3189                                                       int mb_type, int top_xy,
3190                                                       int left_xy[LEFT_MBS],
3191                                                       int top_type,
3192                                                       int left_type[LEFT_MBS],
3193                                                       int mb_xy, int list)
3194 {
3195     int b_stride = h->b_stride;
3196     int16_t(*mv_dst)[2] = &h->mv_cache[list][scan8[0]];
3197     int8_t *ref_cache = &h->ref_cache[list][scan8[0]];
3198     if (IS_INTER(mb_type) || IS_DIRECT(mb_type)) {
3199         if (USES_LIST(top_type, list)) {
3200             const int b_xy  = h->mb2b_xy[top_xy] + 3 * b_stride;
3201             const int b8_xy = 4 * top_xy + 2;
3202             int (*ref2frm)[64] = (void*)(h->ref2frm[h->slice_table[top_xy] & (MAX_SLICES - 1)][0] + (MB_MBAFF ? 20 : 2));
3203             AV_COPY128(mv_dst - 1 * 8, s->current_picture.f.motion_val[list][b_xy + 0]);
3204             ref_cache[0 - 1 * 8] =
3205             ref_cache[1 - 1 * 8] = ref2frm[list][s->current_picture.f.ref_index[list][b8_xy + 0]];
3206             ref_cache[2 - 1 * 8] =
3207             ref_cache[3 - 1 * 8] = ref2frm[list][s->current_picture.f.ref_index[list][b8_xy + 1]];
3208         } else {
3209             AV_ZERO128(mv_dst - 1 * 8);
3210             AV_WN32A(&ref_cache[0 - 1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
3211         }
3212
3213         if (!IS_INTERLACED(mb_type ^ left_type[LTOP])) {
3214             if (USES_LIST(left_type[LTOP], list)) {
3215                 const int b_xy  = h->mb2b_xy[left_xy[LTOP]] + 3;
3216                 const int b8_xy = 4 * left_xy[LTOP] + 1;
3217                 int (*ref2frm)[64] =(void*)( h->ref2frm[h->slice_table[left_xy[LTOP]] & (MAX_SLICES - 1)][0] + (MB_MBAFF ? 20 : 2));
3218                 AV_COPY32(mv_dst - 1 +  0, s->current_picture.f.motion_val[list][b_xy + b_stride * 0]);
3219                 AV_COPY32(mv_dst - 1 +  8, s->current_picture.f.motion_val[list][b_xy + b_stride * 1]);
3220                 AV_COPY32(mv_dst - 1 + 16, s->current_picture.f.motion_val[list][b_xy + b_stride * 2]);
3221                 AV_COPY32(mv_dst - 1 + 24, s->current_picture.f.motion_val[list][b_xy + b_stride * 3]);
3222                 ref_cache[-1 +  0] =
3223                 ref_cache[-1 +  8] = ref2frm[list][s->current_picture.f.ref_index[list][b8_xy + 2 * 0]];
3224                 ref_cache[-1 + 16] =
3225                 ref_cache[-1 + 24] = ref2frm[list][s->current_picture.f.ref_index[list][b8_xy + 2 * 1]];
3226             } else {
3227                 AV_ZERO32(mv_dst - 1 +  0);
3228                 AV_ZERO32(mv_dst - 1 +  8);
3229                 AV_ZERO32(mv_dst - 1 + 16);
3230                 AV_ZERO32(mv_dst - 1 + 24);
3231                 ref_cache[-1 +  0] =
3232                 ref_cache[-1 +  8] =
3233                 ref_cache[-1 + 16] =
3234                 ref_cache[-1 + 24] = LIST_NOT_USED;
3235             }
3236         }
3237     }
3238
3239     if (!USES_LIST(mb_type, list)) {
3240         fill_rectangle(mv_dst, 4, 4, 8, pack16to32(0, 0), 4);
3241         AV_WN32A(&ref_cache[0 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
3242         AV_WN32A(&ref_cache[1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
3243         AV_WN32A(&ref_cache[2 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
3244         AV_WN32A(&ref_cache[3 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
3245         return;
3246     }
3247
3248     {
3249         int8_t *ref = &s->current_picture.f.ref_index[list][4 * mb_xy];
3250         int (*ref2frm)[64] = (void*)(h->ref2frm[h->slice_num & (MAX_SLICES - 1)][0] + (MB_MBAFF ? 20 : 2));
3251         uint32_t ref01 = (pack16to32(ref2frm[list][ref[0]], ref2frm[list][ref[1]]) & 0x00FF00FF) * 0x0101;
3252         uint32_t ref23 = (pack16to32(ref2frm[list][ref[2]], ref2frm[list][ref[3]]) & 0x00FF00FF) * 0x0101;
3253         AV_WN32A(&ref_cache[0 * 8], ref01);
3254         AV_WN32A(&ref_cache[1 * 8], ref01);
3255         AV_WN32A(&ref_cache[2 * 8], ref23);
3256         AV_WN32A(&ref_cache[3 * 8], ref23);
3257     }
3258
3259     {
3260         int16_t(*mv_src)[2] = &s->current_picture.f.motion_val[list][4 * s->mb_x + 4 * s->mb_y * b_stride];
3261         AV_COPY128(mv_dst + 8 * 0, mv_src + 0 * b_stride);
3262         AV_COPY128(mv_dst + 8 * 1, mv_src + 1 * b_stride);
3263         AV_COPY128(mv_dst + 8 * 2, mv_src + 2 * b_stride);
3264         AV_COPY128(mv_dst + 8 * 3, mv_src + 3 * b_stride);
3265     }
3266 }
3267
3268 /**
3269  *
3270  * @return non zero if the loop filter can be skipped
3271  */
3272 static int fill_filter_caches(H264Context *h, int mb_type)
3273 {
3274     MpegEncContext *const s = &h->s;
3275     const int mb_xy = h->mb_xy;
3276     int top_xy, left_xy[LEFT_MBS];
3277     int top_type, left_type[LEFT_MBS];
3278     uint8_t *nnz;
3279     uint8_t *nnz_cache;
3280
3281     top_xy = mb_xy - (s->mb_stride << MB_FIELD);
3282
3283     /* Wow, what a mess, why didn't they simplify the interlacing & intra
3284      * stuff, I can't imagine that these complex rules are worth it. */
3285
3286     left_xy[LBOT] = left_xy[LTOP] = mb_xy - 1;
3287     if (FRAME_MBAFF) {
3288         const int left_mb_field_flag = IS_INTERLACED(s->current_picture.f.mb_type[mb_xy - 1]);
3289         const int curr_mb_field_flag = IS_INTERLACED(mb_type);
3290         if (s->mb_y & 1) {
3291             if (left_mb_field_flag != curr_mb_field_flag)
3292                 left_xy[LTOP] -= s->mb_stride;
3293         } else {
3294             if (curr_mb_field_flag)
3295                 top_xy += s->mb_stride &
3296                     (((s->current_picture.f.mb_type[top_xy] >> 7) & 1) - 1);
3297             if (left_mb_field_flag != curr_mb_field_flag)
3298                 left_xy[LBOT] += s->mb_stride;
3299         }
3300     }
3301
3302     h->top_mb_xy        = top_xy;
3303     h->left_mb_xy[LTOP] = left_xy[LTOP];
3304     h->left_mb_xy[LBOT] = left_xy[LBOT];
3305     {
3306         /* For sufficiently low qp, filtering wouldn't do anything.
3307          * This is a conservative estimate: could also check beta_offset
3308          * and more accurate chroma_qp. */
3309         int qp_thresh = h->qp_thresh; // FIXME strictly we should store qp_thresh for each mb of a slice
3310         int qp        = s->current_picture.f.qscale_table[mb_xy];
3311         if (qp <= qp_thresh &&
3312             (left_xy[LTOP] < 0 ||
3313              ((qp + s->current_picture.f.qscale_table[left_xy[LTOP]] + 1) >> 1) <= qp_thresh) &&
3314             (top_xy < 0 ||
3315              ((qp + s->current_picture.f.qscale_table[top_xy] + 1) >> 1) <= qp_thresh)) {
3316             if (!FRAME_MBAFF)
3317                 return 1;
3318             if ((left_xy[LTOP] < 0 ||
3319                  ((qp + s->current_picture.f.qscale_table[left_xy[LBOT]] + 1) >> 1) <= qp_thresh) &&
3320                 (top_xy < s->mb_stride ||
3321                  ((qp + s->current_picture.f.qscale_table[top_xy - s->mb_stride] + 1) >> 1) <= qp_thresh))
3322                 return 1;
3323         }
3324     }
3325
3326     top_type        = s->current_picture.f.mb_type[top_xy];
3327     left_type[LTOP] = s->current_picture.f.mb_type[left_xy[LTOP]];
3328     left_type[LBOT] = s->current_picture.f.mb_type[left_xy[LBOT]];
3329     if (h->deblocking_filter == 2) {
3330         if (h->slice_table[top_xy] != h->slice_num)
3331             top_type = 0;
3332         if (h->slice_table[left_xy[LBOT]] != h->slice_num)
3333             left_type[LTOP] = left_type[LBOT] = 0;
3334     } else {
3335         if (h->slice_table[top_xy] == 0xFFFF)
3336             top_type = 0;
3337         if (h->slice_table[left_xy[LBOT]] == 0xFFFF)
3338             left_type[LTOP] = left_type[LBOT] = 0;
3339     }
3340     h->top_type        = top_type;
3341     h->left_type[LTOP] = left_type[LTOP];
3342     h->left_type[LBOT] = left_type[LBOT];
3343
3344     if (IS_INTRA(mb_type))
3345         return 0;
3346
3347     fill_filter_caches_inter(h, s, mb_type, top_xy, left_xy,
3348                              top_type, left_type, mb_xy, 0);
3349     if (h->list_count == 2)
3350         fill_filter_caches_inter(h, s, mb_type, top_xy, left_xy,
3351                                  top_type, left_type, mb_xy, 1);
3352
3353     nnz       = h->non_zero_count[mb_xy];
3354     nnz_cache = h->non_zero_count_cache;
3355     AV_COPY32(&nnz_cache[4 + 8 * 1], &nnz[0]);
3356     AV_COPY32(&nnz_cache[4 + 8 * 2], &nnz[4]);
3357     AV_COPY32(&nnz_cache[4 + 8 * 3], &nnz[8]);
3358     AV_COPY32(&nnz_cache[4 + 8 * 4], &nnz[12]);
3359     h->cbp = h->cbp_table[mb_xy];
3360
3361     if (top_type) {
3362         nnz = h->non_zero_count[top_xy];
3363         AV_COPY32(&nnz_cache[4 + 8 * 0], &nnz[3 * 4]);
3364     }
3365
3366     if (left_type[LTOP]) {
3367         nnz = h->non_zero_count[left_xy[LTOP]];
3368         nnz_cache[3 + 8 * 1] = nnz[3 + 0 * 4];
3369         nnz_cache[3 + 8 * 2] = nnz[3 + 1 * 4];
3370         nnz_cache[3 + 8 * 3] = nnz[3 + 2 * 4];
3371         nnz_cache[3 + 8 * 4] = nnz[3 + 3 * 4];
3372     }
3373
3374     /* CAVLC 8x8dct requires NNZ values for residual decoding that differ
3375      * from what the loop filter needs */
3376     if (!CABAC && h->pps.transform_8x8_mode) {
3377         if (IS_8x8DCT(top_type)) {
3378             nnz_cache[4 + 8 * 0]     =
3379                 nnz_cache[5 + 8 * 0] = (h->cbp_table[top_xy] & 0x4000) >> 12;
3380             nnz_cache[6 + 8 * 0]     =
3381                 nnz_cache[7 + 8 * 0] = (h->cbp_table[top_xy] & 0x8000) >> 12;
3382         }
3383         if (IS_8x8DCT(left_type[LTOP])) {
3384             nnz_cache[3 + 8 * 1]     =
3385                 nnz_cache[3 + 8 * 2] = (h->cbp_table[left_xy[LTOP]] & 0x2000) >> 12; // FIXME check MBAFF
3386         }
3387         if (IS_8x8DCT(left_type[LBOT])) {
3388             nnz_cache[3 + 8 * 3]     =
3389                 nnz_cache[3 + 8 * 4] = (h->cbp_table[left_xy[LBOT]] & 0x8000) >> 12; // FIXME check MBAFF
3390         }
3391
3392         if (IS_8x8DCT(mb_type)) {
3393             nnz_cache[scan8[0]] =
3394             nnz_cache[scan8[1]] =
3395             nnz_cache[scan8[2]] =
3396             nnz_cache[scan8[3]] = (h->cbp & 0x1000) >> 12;
3397
3398             nnz_cache[scan8[0 + 4]] =
3399             nnz_cache[scan8[1 + 4]] =
3400             nnz_cache[scan8[2 + 4]] =
3401             nnz_cache[scan8[3 + 4]] = (h->cbp & 0x2000) >> 12;
3402
3403             nnz_cache[scan8[0 + 8]] =
3404             nnz_cache[scan8[1 + 8]] =
3405             nnz_cache[scan8[2 + 8]] =
3406             nnz_cache[scan8[3 + 8]] = (h->cbp & 0x4000) >> 12;
3407
3408             nnz_cache[scan8[0 + 12]] =
3409             nnz_cache[scan8[1 + 12]] =
3410             nnz_cache[scan8[2 + 12]] =
3411             nnz_cache[scan8[3 + 12]] = (h->cbp & 0x8000) >> 12;
3412         }
3413     }
3414
3415     return 0;
3416 }
3417
3418 static void loop_filter(H264Context *h, int start_x, int end_x)
3419 {
3420     MpegEncContext *const s = &h->s;
3421     uint8_t *dest_y, *dest_cb, *dest_cr;
3422     int linesize, uvlinesize, mb_x, mb_y;
3423     const int end_mb_y       = s->mb_y + FRAME_MBAFF;
3424     const int old_slice_type = h->slice_type;
3425     const int pixel_shift    = h->pixel_shift;
3426     const int block_h        = 16 >> s->chroma_y_shift;
3427
3428     if (h->deblocking_filter) {
3429         for (mb_x = start_x; mb_x < end_x; mb_x++)
3430             for (mb_y = end_mb_y - FRAME_MBAFF; mb_y <= end_mb_y; mb_y++) {
3431                 int mb_xy, mb_type;
3432                 mb_xy         = h->mb_xy = mb_x + mb_y * s->mb_stride;
3433                 h->slice_num  = h->slice_table[mb_xy];
3434                 mb_type       = s->current_picture.f.mb_type[mb_xy];
3435                 h->list_count = h->list_counts[mb_xy];
3436
3437                 if (FRAME_MBAFF)
3438                     h->mb_mbaff               =
3439                     h->mb_field_decoding_flag = !!IS_INTERLACED(mb_type);
3440
3441                 s->mb_x = mb_x;
3442                 s->mb_y = mb_y;
3443                 dest_y  = s->current_picture.f.data[0] +
3444                           ((mb_x << pixel_shift) + mb_y * s->linesize) * 16;
3445                 dest_cb = s->current_picture.f.data[1] +
3446                           (mb_x << pixel_shift) * (8 << CHROMA444) +
3447                           mb_y * s->uvlinesize * block_h;
3448                 dest_cr = s->current_picture.f.data[2] +
3449                           (mb_x << pixel_shift) * (8 << CHROMA444) +
3450                           mb_y * s->uvlinesize * block_h;
3451                 // FIXME simplify above
3452
3453                 if (MB_FIELD) {
3454                     linesize   = h->mb_linesize   = s->linesize   * 2;
3455                     uvlinesize = h->mb_uvlinesize = s->uvlinesize * 2;
3456                     if (mb_y & 1) { // FIXME move out of this function?
3457                         dest_y  -= s->linesize   * 15;
3458                         dest_cb -= s->uvlinesize * (block_h - 1);
3459                         dest_cr -= s->uvlinesize * (block_h - 1);
3460                     }
3461                 } else {
3462                     linesize   = h->mb_linesize   = s->linesize;
3463                     uvlinesize = h->mb_uvlinesize = s->uvlinesize;
3464                 }
3465                 backup_mb_border(h, dest_y, dest_cb, dest_cr, linesize,
3466                                  uvlinesize, 0);
3467                 if (fill_filter_caches(h, mb_type))
3468                     continue;
3469                 h->chroma_qp[0] = get_chroma_qp(h, 0, s->current_picture.f.qscale_table[mb_xy]);
3470                 h->chroma_qp[1] = get_chroma_qp(h, 1, s->current_picture.f.qscale_table[mb_xy]);
3471
3472                 if (FRAME_MBAFF) {
3473                     ff_h264_filter_mb(h, mb_x, mb_y, dest_y, dest_cb, dest_cr,
3474                                       linesize, uvlinesize);
3475                 } else {
3476                     ff_h264_filter_mb_fast(h, mb_x, mb_y, dest_y, dest_cb,
3477                                            dest_cr, linesize, uvlinesize);
3478                 }
3479             }
3480     }
3481     h->slice_type   = old_slice_type;
3482     s->mb_x         = end_x;
3483     s->mb_y         = end_mb_y - FRAME_MBAFF;
3484     h->chroma_qp[0] = get_chroma_qp(h, 0, s->qscale);
3485     h->chroma_qp[1] = get_chroma_qp(h, 1, s->qscale);
3486 }
3487
3488 static void predict_field_decoding_flag(H264Context *h)
3489 {
3490     MpegEncContext *const s = &h->s;
3491     const int mb_xy = s->mb_x + s->mb_y * s->mb_stride;
3492     int mb_type     = (h->slice_table[mb_xy - 1] == h->slice_num) ?
3493                       s->current_picture.f.mb_type[mb_xy - 1] :
3494                       (h->slice_table[mb_xy - s->mb_stride] == h->slice_num) ?
3495                       s->current_picture.f.mb_type[mb_xy - s->mb_stride] : 0;
3496     h->mb_mbaff     = h->mb_field_decoding_flag = IS_INTERLACED(mb_type) ? 1 : 0;
3497 }
3498
3499 /**
3500  * Draw edges and report progress for the last MB row.
3501  */
3502 static void decode_finish_row(H264Context *h)
3503 {
3504     MpegEncContext *const s = &h->s;
3505     int top            = 16 * (s->mb_y      >> FIELD_PICTURE);
3506     int pic_height     = 16 *  s->mb_height >> FIELD_PICTURE;
3507     int height         =  16      << FRAME_MBAFF;
3508     int deblock_border = (16 + 4) << FRAME_MBAFF;
3509
3510     if (h->deblocking_filter) {
3511         if ((top + height) >= pic_height)
3512             height += deblock_border;
3513         top -= deblock_border;
3514     }
3515
3516     if (top >= pic_height || (top + height) < h->emu_edge_height)
3517         return;
3518
3519     height = FFMIN(height, pic_height - top);
3520     if (top < h->emu_edge_height) {
3521         height = top + height;
3522         top    = 0;
3523     }
3524
3525     ff_draw_horiz_band(s, top, height);
3526
3527     if (s->dropable)
3528         return;
3529
3530     ff_thread_report_progress(&s->current_picture_ptr->f, top + height - 1,
3531                               s->picture_structure == PICT_BOTTOM_FIELD);
3532 }
3533
3534 static int decode_slice(struct AVCodecContext *avctx, void *arg)
3535 {
3536     H264Context *h = *(void **)arg;
3537     MpegEncContext *const s = &h->s;
3538     const int part_mask     = s->partitioned_frame ? (ER_AC_END | ER_AC_ERROR)
3539                                                    : 0x7F;
3540     int lf_x_start = s->mb_x;
3541
3542     s->mb_skip_run = -1;
3543
3544     h->is_complex = FRAME_MBAFF || s->picture_structure != PICT_FRAME ||
3545                     s->codec_id != AV_CODEC_ID_H264 ||
3546                     (CONFIG_GRAY && (s->flags & CODEC_FLAG_GRAY));
3547
3548     if (h->pps.cabac) {
3549         /* realign */
3550         align_get_bits(&s->gb);
3551
3552         /* init cabac */
3553         ff_init_cabac_decoder(&h->cabac,
3554                               s->gb.buffer + get_bits_count(&s->gb) / 8,
3555                               (get_bits_left(&s->gb) + 7) / 8);
3556
3557         ff_h264_init_cabac_states(h);
3558
3559         for (;;) {
3560             // START_TIMER
3561             int ret = ff_h264_decode_mb_cabac(h);
3562             int eos;
3563             // STOP_TIMER("decode_mb_cabac")
3564
3565             if (ret >= 0)
3566                 ff_h264_hl_decode_mb(h);
3567
3568             // FIXME optimal? or let mb_decode decode 16x32 ?
3569             if (ret >= 0 && FRAME_MBAFF) {
3570                 s->mb_y++;
3571
3572                 ret = ff_h264_decode_mb_cabac(h);
3573
3574                 if (ret >= 0)
3575                     ff_h264_hl_decode_mb(h);
3576                 s->mb_y--;
3577             }
3578             eos = get_cabac_terminate(&h->cabac);
3579
3580             if ((s->workaround_bugs & FF_BUG_TRUNCATED) &&
3581                 h->cabac.bytestream > h->cabac.bytestream_end + 2) {
3582                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1,
3583                                 s->mb_y, ER_MB_END & part_mask);
3584                 if (s->mb_x >= lf_x_start)
3585                     loop_filter(h, lf_x_start, s->mb_x + 1);
3586                 return 0;
3587             }
3588             if (h->cabac.bytestream > h->cabac.bytestream_end + 2 )
3589                 av_log(h->s.avctx, AV_LOG_DEBUG, "bytestream overread %td\n", h->cabac.bytestream_end - h->cabac.bytestream);
3590             if (ret < 0 || h->cabac.bytestream > h->cabac.bytestream_end + 4) {
3591                 av_log(h->s.avctx, AV_LOG_ERROR,
3592                        "error while decoding MB %d %d, bytestream (%td)\n",
3593                        s->mb_x, s->mb_y,
3594                        h->cabac.bytestream_end - h->cabac.bytestream);
3595                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x,
3596                                 s->mb_y, ER_MB_ERROR & part_mask);
3597                 return -1;
3598             }
3599
3600             if (++s->mb_x >= s->mb_width) {
3601                 loop_filter(h, lf_x_start, s->mb_x);
3602                 s->mb_x = lf_x_start = 0;
3603                 decode_finish_row(h);
3604                 ++s->mb_y;
3605                 if (FIELD_OR_MBAFF_PICTURE) {
3606                     ++s->mb_y;
3607                     if (FRAME_MBAFF && s->mb_y < s->mb_height)
3608                         predict_field_decoding_flag(h);
3609                 }
3610             }
3611
3612             if (eos || s->mb_y >= s->mb_height) {
3613                 tprintf(s->avctx, "slice end %d %d\n",
3614                         get_bits_count(&s->gb), s->gb.size_in_bits);
3615                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1,
3616                                 s->mb_y, ER_MB_END & part_mask);
3617                 if (s->mb_x > lf_x_start)
3618                     loop_filter(h, lf_x_start, s->mb_x);
3619                 return 0;
3620             }
3621         }
3622     } else {
3623         for (;;) {
3624             int ret = ff_h264_decode_mb_cavlc(h);
3625
3626             if (ret >= 0)
3627                 ff_h264_hl_decode_mb(h);
3628
3629             // FIXME optimal? or let mb_decode decode 16x32 ?
3630             if (ret >= 0 && FRAME_MBAFF) {
3631                 s->mb_y++;
3632                 ret = ff_h264_decode_mb_cavlc(h);
3633
3634                 if (ret >= 0)
3635                     ff_h264_hl_decode_mb(h);
3636                 s->mb_y--;
3637             }
3638
3639             if (ret < 0) {
3640                 av_log(h->s.avctx, AV_LOG_ERROR,
3641                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);
3642                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x,
3643                                 s->mb_y, ER_MB_ERROR & part_mask);
3644                 return -1;
3645             }
3646
3647             if (++s->mb_x >= s->mb_width) {
3648                 loop_filter(h, lf_x_start, s->mb_x);
3649                 s->mb_x = lf_x_start = 0;
3650                 decode_finish_row(h);
3651                 ++s->mb_y;
3652                 if (FIELD_OR_MBAFF_PICTURE) {
3653                     ++s->mb_y;
3654                     if (FRAME_MBAFF && s->mb_y < s->mb_height)
3655                         predict_field_decoding_flag(h);
3656                 }
3657                 if (s->mb_y >= s->mb_height) {
3658                     tprintf(s->avctx, "slice end %d %d\n",
3659                             get_bits_count(&s->gb), s->gb.size_in_bits);
3660
3661                     if (   get_bits_left(&s->gb) == 0
3662                         || get_bits_left(&s->gb) > 0 && !(s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
3663                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y,
3664                                         s->mb_x - 1, s->mb_y,
3665                                         ER_MB_END & part_mask);
3666
3667                         return 0;
3668                     } else {
3669                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y,
3670                                         s->mb_x, s->mb_y,
3671                                         ER_MB_END & part_mask);
3672
3673                         return -1;
3674                     }
3675                 }
3676             }
3677
3678             if (get_bits_left(&s->gb) <= 0 && s->mb_skip_run <= 0) {
3679                 tprintf(s->avctx, "slice end %d %d\n",
3680                         get_bits_count(&s->gb), s->gb.size_in_bits);
3681                 if (get_bits_left(&s->gb) == 0) {
3682                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y,
3683                                     s->mb_x - 1, s->mb_y,
3684                                     ER_MB_END & part_mask);
3685                     if (s->mb_x > lf_x_start)
3686                         loop_filter(h, lf_x_start, s->mb_x);
3687
3688                     return 0;
3689                 } else {
3690                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x,
3691                                     s->mb_y, ER_MB_ERROR & part_mask);
3692
3693                     return -1;
3694                 }
3695             }
3696         }
3697     }
3698 }
3699
3700 /**
3701  * Call decode_slice() for each context.
3702  *
3703  * @param h h264 master context
3704  * @param context_count number of contexts to execute
3705  */
3706 static int execute_decode_slices(H264Context *h, int context_count)
3707 {
3708     MpegEncContext *const s     = &h->s;
3709     AVCodecContext *const avctx = s->avctx;
3710     H264Context *hx;
3711     int i;
3712
3713     if (s->avctx->hwaccel ||
3714         s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
3715         return 0;
3716     if (context_count == 1) {
3717         return decode_slice(avctx, &h);
3718     } else {
3719         for (i = 1; i < context_count; i++) {
3720             hx                    = h->thread_context[i];
3721             hx->s.err_recognition = avctx->err_recognition;
3722             hx->s.error_count     = 0;
3723             hx->x264_build        = h->x264_build;
3724         }
3725
3726         avctx->execute(avctx, decode_slice, h->thread_context,
3727                        NULL, context_count, sizeof(void *));
3728
3729         /* pull back stuff from slices to master context */
3730         hx                   = h->thread_context[context_count - 1];
3731         s->mb_x              = hx->s.mb_x;
3732         s->mb_y              = hx->s.mb_y;
3733         s->dropable          = hx->s.dropable;
3734         s->picture_structure = hx->s.picture_structure;
3735         for (i = 1; i < context_count; i++)
3736             h->s.error_count += h->thread_context[i]->s.error_count;
3737     }
3738
3739     return 0;
3740 }
3741
3742 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
3743 {
3744     MpegEncContext *const s     = &h->s;
3745     AVCodecContext *const avctx = s->avctx;
3746     H264Context *hx; ///< thread context
3747     int buf_index;
3748     int context_count;
3749     int next_avc;
3750     int pass = !(avctx->active_thread_type & FF_THREAD_FRAME);
3751     int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
3752     int nal_index;
3753
3754     h->nal_unit_type= 0;
3755
3756     if(!s->slice_context_count)
3757          s->slice_context_count= 1;
3758     h->max_contexts = s->slice_context_count;
3759     if (!(s->flags2 & CODEC_FLAG2_CHUNKS)) {
3760         h->current_slice = 0;
3761         if (!s->first_field)
3762             s->current_picture_ptr = NULL;
3763         ff_h264_reset_sei(h);
3764     }
3765
3766     if (h->nal_length_size == 4) {
3767         if (buf_size > 8 && AV_RB32(buf) == 1 && AV_RB32(buf+5) > (unsigned)buf_size) {
3768             h->is_avc = 0;
3769         }else if(buf_size > 3 && AV_RB32(buf) > 1 && AV_RB32(buf) <= (unsigned)buf_size)
3770             h->is_avc = 1;
3771     }
3772
3773     for (; pass <= 1; pass++) {
3774         buf_index     = 0;
3775         context_count = 0;
3776         next_avc      = h->is_avc ? 0 : buf_size;
3777         nal_index     = 0;
3778         for (;;) {
3779             int consumed;
3780             int dst_length;
3781             int bit_length;
3782             const uint8_t *ptr;
3783             int i, nalsize = 0;
3784             int err;
3785
3786             if (buf_index >= next_avc) {
3787                 if (buf_index >= buf_size - h->nal_length_size)
3788                     break;
3789                 nalsize = 0;
3790                 for (i = 0; i < h->nal_length_size; i++)
3791                     nalsize = (nalsize << 8) | buf[buf_index++];
3792                 if (nalsize <= 0 || nalsize > buf_size - buf_index) {
3793                     av_log(h->s.avctx, AV_LOG_ERROR,
3794                            "AVC: nal size %d\n", nalsize);
3795                     break;
3796                 }
3797                 next_avc = buf_index + nalsize;
3798             } else {
3799                 // start code prefix search
3800                 for (; buf_index + 3 < next_avc; buf_index++)
3801                     // This should always succeed in the first iteration.
3802                     if (buf[buf_index]     == 0 &&
3803                         buf[buf_index + 1] == 0 &&
3804                         buf[buf_index + 2] == 1)
3805                         break;
3806
3807                 if (buf_index + 3 >= buf_size) {
3808                     buf_index = buf_size;
3809                     break;
3810                 }
3811
3812                 buf_index += 3;
3813                 if (buf_index >= next_avc)
3814                     continue;
3815             }
3816
3817             hx = h->thread_context[context_count];
3818
3819             ptr = ff_h264_decode_nal(hx, buf + buf_index, &dst_length,
3820                                      &consumed, next_avc - buf_index);
3821             if (ptr == NULL || dst_length < 0) {
3822                 buf_index = -1;
3823                 goto end;
3824             }
3825             i = buf_index + consumed;
3826             if ((s->workaround_bugs & FF_BUG_AUTODETECT) && i + 3 < next_avc &&
3827                 buf[i]     == 0x00 && buf[i + 1] == 0x00 &&
3828                 buf[i + 2] == 0x01 && buf[i + 3] == 0xE0)
3829                 s->workaround_bugs |= FF_BUG_TRUNCATED;
3830
3831             if (!(s->workaround_bugs & FF_BUG_TRUNCATED))
3832                 while(dst_length > 0 && ptr[dst_length - 1] == 0)
3833                     dst_length--;
3834             bit_length = !dst_length ? 0
3835                                      : (8 * dst_length -
3836                                         decode_rbsp_trailing(h, ptr + dst_length - 1));
3837
3838             if (s->avctx->debug & FF_DEBUG_STARTCODE)
3839                 av_log(h->s.avctx, AV_LOG_DEBUG, "NAL %d/%d at %d/%d length %d pass %d\n", hx->nal_unit_type, hx->nal_ref_idc, buf_index, buf_size, dst_length, pass);
3840
3841             if (h->is_avc && (nalsize != consumed) && nalsize)
3842                 av_log(h->s.avctx, AV_LOG_DEBUG,
3843                        "AVC: Consumed only %d bytes instead of %d\n",
3844                        consumed, nalsize);
3845
3846             buf_index += consumed;
3847             nal_index++;
3848
3849             if (pass == 0) {
3850                 /* packets can sometimes contain multiple PPS/SPS,
3851                  * e.g. two PAFF field pictures in one packet, or a demuxer
3852                  * which splits NALs strangely if so, when frame threading we
3853                  * can't start the next thread until we've read all of them */
3854                 switch (hx->nal_unit_type) {
3855                 case NAL_SPS:
3856                 case NAL_PPS:
3857                     nals_needed = nal_index;
3858                     break;
3859                 case NAL_IDR_SLICE:
3860                 case NAL_SLICE:
3861                     init_get_bits(&hx->s.gb, ptr, bit_length);
3862                     if (!get_ue_golomb(&hx->s.gb))
3863                         nals_needed = nal_index;
3864                 }
3865                 continue;
3866             }
3867
3868             // FIXME do not discard SEI id
3869             if (avctx->skip_frame >= AVDISCARD_NONREF && h->nal_ref_idc == 0)
3870                 continue;
3871
3872 again:
3873             err = 0;
3874
3875             if (h->decoding_extradata) {
3876                 switch (hx->nal_unit_type) {
3877                 case NAL_IDR_SLICE:
3878                 case NAL_SLICE:
3879                 case NAL_DPA:
3880                 case NAL_DPB:
3881                 case NAL_DPC:
3882                 case NAL_AUXILIARY_SLICE:
3883                     av_log(h->s.avctx, AV_LOG_WARNING, "Ignoring NAL %d in global header\n", hx->nal_unit_type);
3884                     hx->nal_unit_type = NAL_FILLER_DATA;
3885                 }
3886             }
3887
3888             switch (hx->nal_unit_type) {
3889             case NAL_IDR_SLICE:
3890                 if (h->nal_unit_type != NAL_IDR_SLICE) {
3891                     av_log(h->s.avctx, AV_LOG_ERROR,
3892                            "Invalid mix of idr and non-idr slices\n");
3893                     buf_index = -1;
3894                     goto end;
3895                 }
3896                 idr(h); // FIXME ensure we don't lose some frames if there is reordering
3897             case NAL_SLICE:
3898                 init_get_bits(&hx->s.gb, ptr, bit_length);
3899                 hx->intra_gb_ptr        =
3900                     hx->inter_gb_ptr    = &hx->s.gb;
3901                 hx->s.data_partitioning = 0;
3902
3903                 if ((err = decode_slice_header(hx, h)))
3904                     break;
3905
3906                 if (h->sei_recovery_frame_cnt >= 0 && (h->frame_num != h->sei_recovery_frame_cnt || hx->slice_type_nos != AV_PICTURE_TYPE_I))
3907                     h->valid_recovery_point = 1;
3908
3909                 if (   h->sei_recovery_frame_cnt >= 0
3910                     && (   h->recovery_frame<0
3911                         || ((h->recovery_frame - h->frame_num) & ((1 << h->sps.log2_max_frame_num)-1)) > h->sei_recovery_frame_cnt)) {
3912                     h->recovery_frame = (h->frame_num + h->sei_recovery_frame_cnt) %
3913                                         (1 << h->sps.log2_max_frame_num);
3914
3915                     if (!h->valid_recovery_point)
3916                         h->recovery_frame = h->frame_num;
3917                 }
3918
3919                 s->current_picture_ptr->f.key_frame |=
3920                         (hx->nal_unit_type == NAL_IDR_SLICE);
3921
3922                 if (h->recovery_frame == h->frame_num) {
3923                     s->current_picture_ptr->sync |= 1;
3924                     h->recovery_frame = -1;
3925                 }
3926
3927                 h->sync |= !!s->current_picture_ptr->f.key_frame;
3928                 h->sync |= 3*!!(s->flags2 & CODEC_FLAG2_SHOW_ALL);
3929                 s->current_picture_ptr->sync |= h->sync;
3930
3931                 if (h->current_slice == 1) {
3932                     if (!(s->flags2 & CODEC_FLAG2_CHUNKS))
3933                         decode_postinit(h, nal_index >= nals_needed);
3934
3935                     if (s->avctx->hwaccel &&
3936                         s->avctx->hwaccel->start_frame(s->avctx, NULL, 0) < 0)
3937                         return -1;
3938                     if (CONFIG_H264_VDPAU_DECODER &&
3939                         s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
3940                         ff_vdpau_h264_picture_start(s);
3941                 }
3942
3943                 if (hx->redundant_pic_count == 0 &&
3944                     (avctx->skip_frame < AVDISCARD_NONREF ||
3945                      hx->nal_ref_idc) &&
3946                     (avctx->skip_frame < AVDISCARD_BIDIR  ||
3947                      hx->slice_type_nos != AV_PICTURE_TYPE_B) &&
3948                     (avctx->skip_frame < AVDISCARD_NONKEY ||
3949                      hx->slice_type_nos == AV_PICTURE_TYPE_I) &&
3950                     avctx->skip_frame < AVDISCARD_ALL) {
3951                     if (avctx->hwaccel) {
3952                         if (avctx->hwaccel->decode_slice(avctx,
3953                                                          &buf[buf_index - consumed],
3954                                                          consumed) < 0)
3955                             return -1;
3956                     } else if (CONFIG_H264_VDPAU_DECODER &&
3957                                s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
3958                         static const uint8_t start_code[] = {
3959                             0x00, 0x00, 0x01 };
3960                         ff_vdpau_add_data_chunk(s, start_code,
3961                                                 sizeof(start_code));
3962                         ff_vdpau_add_data_chunk(s, &buf[buf_index - consumed],
3963                                                 consumed);
3964                     } else
3965                         context_count++;
3966                 }
3967                 break;
3968             case NAL_DPA:
3969                 init_get_bits(&hx->s.gb, ptr, bit_length);
3970                 hx->intra_gb_ptr =
3971                 hx->inter_gb_ptr = NULL;
3972
3973                 if ((err = decode_slice_header(hx, h)) < 0)
3974                     break;
3975
3976                 hx->s.data_partitioning = 1;
3977                 break;
3978             case NAL_DPB:
3979                 init_get_bits(&hx->intra_gb, ptr, bit_length);
3980                 hx->intra_gb_ptr = &hx->intra_gb;
3981                 break;
3982             case NAL_DPC:
3983                 init_get_bits(&hx->inter_gb, ptr, bit_length);
3984                 hx->inter_gb_ptr = &hx->inter_gb;
3985
3986                 av_log(h->s.avctx, AV_LOG_ERROR, "Partitioned H.264 support is incomplete\n");
3987                 break;
3988
3989                 if (hx->redundant_pic_count == 0 &&
3990                     hx->intra_gb_ptr &&
3991                     hx->s.data_partitioning &&
3992                     s->current_picture_ptr &&
3993                     s->context_initialized &&
3994                     (avctx->skip_frame < AVDISCARD_NONREF || hx->nal_ref_idc) &&
3995                     (avctx->skip_frame < AVDISCARD_BIDIR  ||
3996                      hx->slice_type_nos != AV_PICTURE_TYPE_B) &&
3997                     (avctx->skip_frame < AVDISCARD_NONKEY ||
3998                      hx->slice_type_nos == AV_PICTURE_TYPE_I) &&
3999                     avctx->skip_frame < AVDISCARD_ALL)
4000                     context_count++;
4001                 break;
4002             case NAL_SEI:
4003                 init_get_bits(&s->gb, ptr, bit_length);
4004                 ff_h264_decode_sei(h);
4005                 break;
4006             case NAL_SPS:
4007                 init_get_bits(&s->gb, ptr, bit_length);
4008                 if (ff_h264_decode_seq_parameter_set(h) < 0 && (h->is_avc ? (nalsize != consumed) && nalsize : 1)) {
4009                     av_log(h->s.avctx, AV_LOG_DEBUG,
4010                            "SPS decoding failure, trying again with the complete NAL\n");
4011                     if (h->is_avc)
4012                         av_assert0(next_avc - buf_index + consumed == nalsize);
4013                     if ((next_avc - buf_index + consumed - 1) >= INT_MAX/8)
4014                         break;
4015                     init_get_bits(&s->gb, &buf[buf_index + 1 - consumed],
4016                                   8*(next_avc - buf_index + consumed - 1));
4017                     ff_h264_decode_seq_parameter_set(h);
4018                 }
4019
4020                 if (s->flags & CODEC_FLAG_LOW_DELAY ||
4021                     (h->sps.bitstream_restriction_flag &&
4022                      !h->sps.num_reorder_frames)) {
4023                     if (s->avctx->has_b_frames > 1 || h->delayed_pic[0])
4024                         av_log(avctx, AV_LOG_WARNING, "Delayed frames seen "
4025                                "reenabling low delay requires a codec "
4026                                "flush.\n");
4027                         else
4028                             s->low_delay = 1;
4029                 }
4030
4031                 if (avctx->has_b_frames < 2)
4032                     avctx->has_b_frames = !s->low_delay;
4033                 break;
4034             case NAL_PPS:
4035                 init_get_bits(&s->gb, ptr, bit_length);
4036                 ff_h264_decode_picture_parameter_set(h, bit_length);
4037                 break;
4038             case NAL_AUD:
4039             case NAL_END_SEQUENCE:
4040             case NAL_END_STREAM:
4041             case NAL_FILLER_DATA:
4042             case NAL_SPS_EXT:
4043             case NAL_AUXILIARY_SLICE:
4044                 break;
4045             default:
4046                 av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
4047                        hx->nal_unit_type, bit_length);
4048             }
4049
4050             if (context_count == h->max_contexts) {
4051                 execute_decode_slices(h, context_count);
4052                 context_count = 0;
4053             }
4054
4055             if (err < 0)
4056                 av_log(h->s.avctx, AV_LOG_ERROR, "decode_slice_header error\n");
4057             else if (err == 1) {
4058                 /* Slice could not be decoded in parallel mode, copy down
4059                  * NAL unit stuff to context 0 and restart. Note that
4060                  * rbsp_buffer is not transferred, but since we no longer
4061                  * run in parallel mode this should not be an issue. */
4062                 h->nal_unit_type = hx->nal_unit_type;
4063                 h->nal_ref_idc   = hx->nal_ref_idc;
4064                 hx               = h;
4065                 goto again;
4066             }
4067         }
4068     }
4069     if (context_count)
4070         execute_decode_slices(h, context_count);
4071
4072 end:
4073     /* clean up */
4074     if (s->current_picture_ptr && s->current_picture_ptr->owner2 == s &&
4075         !s->dropable) {
4076         ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX,
4077                                   s->picture_structure == PICT_BOTTOM_FIELD);
4078     }
4079
4080     return buf_index;
4081 }
4082
4083 /**
4084  * Return the number of bytes consumed for building the current frame.
4085  */
4086 static int get_consumed_bytes(MpegEncContext *s, int pos, int buf_size)
4087 {
4088     if (pos == 0)
4089         pos = 1;          // avoid infinite loops (i doubt that is needed but ...)
4090     if (pos + 10 > buf_size)
4091         pos = buf_size;                   // oops ;)
4092
4093     return pos;
4094 }
4095
4096 static int decode_frame(AVCodecContext *avctx, void *data,
4097                         int *data_size, AVPacket *avpkt)
4098 {
4099     const uint8_t *buf = avpkt->data;
4100     int buf_size       = avpkt->size;
4101     H264Context *h     = avctx->priv_data;
4102     MpegEncContext *s  = &h->s;
4103     AVFrame *pict      = data;
4104     int buf_index      = 0;
4105     Picture *out;
4106     int i, out_idx;
4107
4108     s->flags  = avctx->flags;
4109     s->flags2 = avctx->flags2;
4110
4111     /* end of stream, output what is still in the buffers */
4112     if (buf_size == 0) {
4113  out:
4114
4115         s->current_picture_ptr = NULL;
4116
4117         // FIXME factorize this with the output code below
4118         out     = h->delayed_pic[0];
4119         out_idx = 0;
4120         for (i = 1;
4121              h->delayed_pic[i] &&
4122              !h->delayed_pic[i]->f.key_frame &&
4123              !h->delayed_pic[i]->mmco_reset;
4124              i++)
4125             if (h->delayed_pic[i]->poc < out->poc) {
4126                 out     = h->delayed_pic[i];
4127                 out_idx = i;
4128             }
4129
4130         for (i = out_idx; h->delayed_pic[i]; i++)
4131             h->delayed_pic[i] = h->delayed_pic[i + 1];
4132
4133         if (out) {
4134             *data_size = sizeof(AVFrame);
4135             *pict      = out->f;
4136         }
4137
4138         return buf_index;
4139     }
4140     if(h->is_avc && buf_size >= 9 && buf[0]==1 && buf[2]==0 && (buf[4]&0xFC)==0xFC && (buf[5]&0x1F) && buf[8]==0x67){
4141         int cnt= buf[5]&0x1f;
4142         const uint8_t *p= buf+6;
4143         while(cnt--){
4144             int nalsize= AV_RB16(p) + 2;
4145             if(nalsize > buf_size - (p-buf) || p[2]!=0x67)
4146                 goto not_extra;
4147             p += nalsize;
4148         }
4149         cnt = *(p++);
4150         if(!cnt)
4151             goto not_extra;
4152         while(cnt--){
4153             int nalsize= AV_RB16(p) + 2;
4154             if(nalsize > buf_size - (p-buf) || p[2]!=0x68)
4155                 goto not_extra;
4156             p += nalsize;
4157         }
4158
4159         return ff_h264_decode_extradata(h, buf, buf_size);
4160     }
4161 not_extra:
4162
4163     buf_index = decode_nal_units(h, buf, buf_size);
4164     if (buf_index < 0)
4165         return -1;
4166
4167     if (!s->current_picture_ptr && h->nal_unit_type == NAL_END_SEQUENCE) {
4168         av_assert0(buf_index <= buf_size);
4169         goto out;
4170     }
4171
4172     if (!(s->flags2 & CODEC_FLAG2_CHUNKS) && !s->current_picture_ptr) {
4173         if (avctx->skip_frame >= AVDISCARD_NONREF ||
4174             buf_size >= 4 && !memcmp("Q264", buf, 4))
4175             return buf_size;
4176         av_log(avctx, AV_LOG_ERROR, "no frame!\n");
4177         return -1;
4178     }
4179
4180     if (!(s->flags2 & CODEC_FLAG2_CHUNKS) ||
4181         (s->mb_y >= s->mb_height && s->mb_height)) {
4182         if (s->flags2 & CODEC_FLAG2_CHUNKS)
4183             decode_postinit(h, 1);
4184
4185         field_end(h, 0);
4186
4187         /* Wait for second field. */
4188         *data_size = 0;
4189         if (h->next_output_pic && (h->next_output_pic->sync || h->sync>1)) {
4190             *data_size = sizeof(AVFrame);
4191             *pict      = h->next_output_pic->f;
4192         }
4193     }
4194
4195     assert(pict->data[0] || !*data_size);
4196     ff_print_debug_info(s, pict);
4197
4198     return get_consumed_bytes(s, buf_index, buf_size);
4199 }
4200
4201 av_cold void ff_h264_free_context(H264Context *h)
4202 {
4203     int i;
4204
4205     free_tables(h, 1); // FIXME cleanup init stuff perhaps
4206
4207     for (i = 0; i < MAX_SPS_COUNT; i++)
4208         av_freep(h->sps_buffers + i);
4209
4210     for (i = 0; i < MAX_PPS_COUNT; i++)
4211         av_freep(h->pps_buffers + i);
4212 }
4213
4214 static av_cold int h264_decode_end(AVCodecContext *avctx)
4215 {
4216     H264Context *h    = avctx->priv_data;
4217     MpegEncContext *s = &h->s;
4218
4219     ff_h264_remove_all_refs(h);
4220     ff_h264_free_context(h);
4221
4222     ff_MPV_common_end(s);
4223
4224     // memset(h, 0, sizeof(H264Context));
4225
4226     return 0;
4227 }
4228
4229 static const AVProfile profiles[] = {
4230     { FF_PROFILE_H264_BASELINE,             "Baseline"              },
4231     { FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline"  },
4232     { FF_PROFILE_H264_MAIN,                 "Main"                  },
4233     { FF_PROFILE_H264_EXTENDED,             "Extended"              },
4234     { FF_PROFILE_H264_HIGH,                 "High"                  },
4235     { FF_PROFILE_H264_HIGH_10,              "High 10"               },
4236     { FF_PROFILE_H264_HIGH_10_INTRA,        "High 10 Intra"         },
4237     { FF_PROFILE_H264_HIGH_422,             "High 4:2:2"            },
4238     { FF_PROFILE_H264_HIGH_422_INTRA,       "High 4:2:2 Intra"      },
4239     { FF_PROFILE_H264_HIGH_444,             "High 4:4:4"            },
4240     { FF_PROFILE_H264_HIGH_444_PREDICTIVE,  "High 4:4:4 Predictive" },
4241     { FF_PROFILE_H264_HIGH_444_INTRA,       "High 4:4:4 Intra"      },
4242     { FF_PROFILE_H264_CAVLC_444,            "CAVLC 4:4:4"           },
4243     { FF_PROFILE_UNKNOWN },
4244 };
4245
4246 static const AVOption h264_options[] = {
4247     {"is_avc", "is avc", offsetof(H264Context, is_avc), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
4248     {"nal_length_size", "nal_length_size", offsetof(H264Context, nal_length_size), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0},
4249     {NULL}
4250 };
4251
4252 static const AVClass h264_class = {
4253     .class_name = "H264 Decoder",
4254     .item_name  = av_default_item_name,
4255     .option     = h264_options,
4256     .version    = LIBAVUTIL_VERSION_INT,
4257 };
4258
4259 static const AVClass h264_vdpau_class = {
4260     .class_name = "H264 VDPAU Decoder",
4261     .item_name  = av_default_item_name,
4262     .option     = h264_options,
4263     .version    = LIBAVUTIL_VERSION_INT,
4264 };
4265
4266 AVCodec ff_h264_decoder = {
4267     .name                  = "h264",
4268     .type                  = AVMEDIA_TYPE_VIDEO,
4269     .id                    = AV_CODEC_ID_H264,
4270     .priv_data_size        = sizeof(H264Context),
4271     .init                  = ff_h264_decode_init,
4272     .close                 = h264_decode_end,
4273     .decode                = decode_frame,
4274     .capabilities          = /*CODEC_CAP_DRAW_HORIZ_BAND |*/ CODEC_CAP_DR1 |
4275                              CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS |
4276                              CODEC_CAP_FRAME_THREADS,
4277     .flush                 = flush_dpb,
4278     .long_name             = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
4279     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
4280     .update_thread_context = ONLY_IF_THREADS_ENABLED(decode_update_thread_context),
4281     .profiles              = NULL_IF_CONFIG_SMALL(profiles),
4282     .priv_class            = &h264_class,
4283 };
4284
4285 #if CONFIG_H264_VDPAU_DECODER
4286 AVCodec ff_h264_vdpau_decoder = {
4287     .name           = "h264_vdpau",
4288     .type           = AVMEDIA_TYPE_VIDEO,
4289     .id             = AV_CODEC_ID_H264,
4290     .priv_data_size = sizeof(H264Context),
4291     .init           = ff_h264_decode_init,
4292     .close          = h264_decode_end,
4293     .decode         = decode_frame,
4294     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
4295     .flush          = flush_dpb,
4296     .long_name      = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration)"),
4297     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_H264,
4298                                                    AV_PIX_FMT_NONE},
4299     .profiles       = NULL_IF_CONFIG_SMALL(profiles),
4300     .priv_class     = &h264_vdpau_class,
4301 };
4302 #endif