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

   1 /*
   2  * MJPEG decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2003 Alex Beregszaszi
   5  * Copyright (c) 2003-2004 Michael Niedermayer
   6  *
   7  * Support for external huffman table, various fixes (AVID workaround),
   8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
   9  *                                  by Alex Beregszaszi
  10  *
  11  * This file is part of FFmpeg.
  12  *
  13  * FFmpeg is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation; either
  16  * version 2.1 of the License, or (at your option) any later version.
  17  *
  18  * FFmpeg is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with FFmpeg; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 /**
  29  * @file
  30  * MJPEG decoder.
  31  */
  32
  33 //#define DEBUG
  34 #include <assert.h>
  35
  36 #include "libavutil/imgutils.h"
  37 #include "libavutil/avassert.h"
  38 #include "libavutil/opt.h"
  39 #include "avcodec.h"
  40 #include "dsputil.h"
  41 #include "mjpeg.h"
  42 #include "mjpegdec.h"
  43 #include "jpeglsdec.h"
  44
  45
  46 static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
  47                       int nb_codes, int use_static, int is_ac)
  48 {
  49     uint8_t huff_size[256];
  50     uint16_t huff_code[256];
  51     uint16_t huff_sym[256];
  52     int i;
  53
  54     assert(nb_codes <= 256);
  55
  56     memset(huff_size, 0, sizeof(huff_size));
  57     ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
  58
  59     for(i=0; i<256; i++)
  60         huff_sym[i]= i + 16*is_ac;
  61
  62     if(is_ac) huff_sym[0]= 16*256;
  63
  64     return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);
  65 }
  66
  67 static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
  68     build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
  69               ff_mjpeg_val_dc, 12, 0, 0);
  70     build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
  71               ff_mjpeg_val_dc, 12, 0, 0);
  72     build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
  73               ff_mjpeg_val_ac_luminance, 251, 0, 1);
  74     build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
  75               ff_mjpeg_val_ac_chrominance, 251, 0, 1);
  76     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
  77               ff_mjpeg_val_ac_luminance, 251, 0, 0);
  78     build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
  79               ff_mjpeg_val_ac_chrominance, 251, 0, 0);
  80 }
  81
  82 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
  83 {
  84     MJpegDecodeContext *s = avctx->priv_data;
  85
  86     if (!s->picture_ptr)
  87         s->picture_ptr = &s->picture;
  88     avcodec_get_frame_defaults(&s->picture);
  89
  90     s->avctx = avctx;
  91     dsputil_init(&s->dsp, avctx);
  92     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
  93     s->buffer_size = 0;
  94     s->buffer = NULL;
  95     s->start_code = -1;
  96     s->first_picture = 1;
  97     s->org_height = avctx->coded_height;
  98     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  99
 100     build_basic_mjpeg_vlc(s);
 101
 102 #if FF_API_MJPEG_GLOBAL_OPTS
 103     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
 104         s->extern_huff = 1;
 105 #endif
 106     if (s->extern_huff)
 107     {
 108         av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
 109         init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
 110         if (ff_mjpeg_decode_dht(s)) {
 111             av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
 112             build_basic_mjpeg_vlc(s);
 113         }
 114     }
 115     if (avctx->extradata_size > 9 &&
 116         AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
 117         if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
 118             s->interlace_polarity = 1; /* bottom field first */
 119             av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
 120         }
 121     }
 122     if (avctx->codec->id == CODEC_ID_AMV)
 123         s->flipped = 1;
 124
 125     return 0;
 126 }
 127
 128
 129 /* quantize tables */
 130 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
 131 {
 132     int len, index, i, j;
 133
 134     len = get_bits(&s->gb, 16) - 2;
 135
 136     while (len >= 65) {
 137         /* only 8 bit precision handled */
 138         if (get_bits(&s->gb, 4) != 0)
 139         {
 140             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
 141             return -1;
 142         }
 143         index = get_bits(&s->gb, 4);
 144         if (index >= 4)
 145             return -1;
 146         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
 147         /* read quant table */
 148         for(i=0;i<64;i++) {
 149             j = s->scantable.permutated[i];
 150             s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
 151         }
 152
 153         //XXX FIXME finetune, and perhaps add dc too
 154         s->qscale[index]= FFMAX(
 155             s->quant_matrixes[index][s->scantable.permutated[1]],
 156             s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
 157         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
 158         len -= 65;
 159     }
 160
 161     return 0;
 162 }
 163
 164 /* decode huffman tables and build VLC decoders */
 165 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
 166 {
 167     int len, index, i, class, n, v, code_max;
 168     uint8_t bits_table[17];
 169     uint8_t val_table[256];
 170
 171     len = get_bits(&s->gb, 16) - 2;
 172
 173     while (len > 0) {
 174         if (len < 17)
 175             return -1;
 176         class = get_bits(&s->gb, 4);
 177         if (class >= 2)
 178             return -1;
 179         index = get_bits(&s->gb, 4);
 180         if (index >= 4)
 181             return -1;
 182         n = 0;
 183         for(i=1;i<=16;i++) {
 184             bits_table[i] = get_bits(&s->gb, 8);
 185             n += bits_table[i];
 186         }
 187         len -= 17;
 188         if (len < n || n > 256)
 189             return -1;
 190
 191         code_max = 0;
 192         for(i=0;i<n;i++) {
 193             v = get_bits(&s->gb, 8);
 194             if (v > code_max)
 195                 code_max = v;
 196             val_table[i] = v;
 197         }
 198         len -= n;
 199
 200         /* build VLC and flush previous vlc if present */
 201         free_vlc(&s->vlcs[class][index]);
 202         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
 203                class, index, code_max + 1);
 204         if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
 205             return -1;
 206         }
 207
 208         if(class>0){
 209             free_vlc(&s->vlcs[2][index]);
 210             if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){
 211             return -1;
 212             }
 213         }
 214     }
 215     return 0;
 216 }
 217
 218 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
 219 {
 220     int len, nb_components, i, width, height, pix_fmt_id;
 221
 222     s->cur_scan = 0;
 223
 224     /* XXX: verify len field validity */
 225     len = get_bits(&s->gb, 16);
 226     s->bits= get_bits(&s->gb, 8);
 227
 228     if(s->pegasus_rct) s->bits=9;
 229     if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
 230
 231     if (s->bits != 8 && !s->lossless){
 232         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
 233         return -1;
 234     }
 235
 236     height = get_bits(&s->gb, 16);
 237     width = get_bits(&s->gb, 16);
 238
 239     //HACK for odd_height.mov
 240     if(s->interlaced && s->width == width && s->height == height + 1)
 241         height= s->height;
 242
 243     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
 244     if(av_image_check_size(width, height, 0, s->avctx))
 245         return -1;
 246
 247     nb_components = get_bits(&s->gb, 8);
 248     if (nb_components <= 0 ||
 249         nb_components > MAX_COMPONENTS)
 250         return -1;
 251     if (s->ls && !(s->bits <= 8 || nb_components == 1)){
 252         av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
 253         return -1;
 254     }
 255     s->nb_components = nb_components;
 256     s->h_max = 1;
 257     s->v_max = 1;
 258     for(i=0;i<nb_components;i++) {
 259         /* component id */
 260         s->component_id[i] = get_bits(&s->gb, 8) - 1;
 261         s->h_count[i] = get_bits(&s->gb, 4);
 262         s->v_count[i] = get_bits(&s->gb, 4);
 263         /* compute hmax and vmax (only used in interleaved case) */
 264         if (s->h_count[i] > s->h_max)
 265             s->h_max = s->h_count[i];
 266         if (s->v_count[i] > s->v_max)
 267             s->v_max = s->v_count[i];
 268         s->quant_index[i] = get_bits(&s->gb, 8);
 269         if (s->quant_index[i] >= 4)
 270             return -1;
 271         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
 272                s->v_count[i], s->component_id[i], s->quant_index[i]);
 273     }
 274
 275     if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
 276         av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
 277         return -1;
 278     }
 279
 280     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
 281
 282     /* if different size, realloc/alloc picture */
 283     /* XXX: also check h_count and v_count */
 284     if (width != s->width || height != s->height) {
 285         av_freep(&s->qscale_table);
 286
 287         s->width = width;
 288         s->height = height;
 289         s->interlaced = 0;
 290
 291         /* test interlaced mode */
 292         if (s->first_picture &&
 293             s->org_height != 0 &&
 294             s->height < ((s->org_height * 3) / 4)) {
 295             s->interlaced = 1;
 296             s->bottom_field = s->interlace_polarity;
 297             s->picture_ptr->interlaced_frame = 1;
 298             s->picture_ptr->top_field_first = !s->interlace_polarity;
 299             height *= 2;
 300         }
 301
 302         avcodec_set_dimensions(s->avctx, width, height);
 303
 304         s->qscale_table= av_mallocz((s->width+15)/16);
 305
 306         s->first_picture = 0;
 307     }
 308
 309     if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
 310         return 0;
 311
 312     /* XXX: not complete test ! */
 313     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
 314                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
 315                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
 316                  (s->h_count[3] <<  4) |  s->v_count[3];
 317     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
 318     //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
 319     if(!(pix_fmt_id & 0xD0D0D0D0))
 320         pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
 321     if(!(pix_fmt_id & 0x0D0D0D0D))
 322         pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
 323
 324     switch(pix_fmt_id){
 325     case 0x11111100:
 326         if(s->rgb){
 327             s->avctx->pix_fmt = PIX_FMT_BGRA;
 328         }else{
 329             if(s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A'){
 330                 s->avctx->pix_fmt = PIX_FMT_GBR24P;
 331             }else{
 332             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
 333             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 334             }
 335         }
 336         assert(s->nb_components==3);
 337         break;
 338     case 0x11000000:
 339         s->avctx->pix_fmt = PIX_FMT_GRAY8;
 340         break;
 341     case 0x12111100:
 342         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
 343         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 344         break;
 345     case 0x21111100:
 346         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
 347         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 348         break;
 349     case 0x22111100:
 350         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
 351         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 352         break;
 353     default:
 354         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
 355         return -1;
 356     }
 357     if(s->ls){
 358         if(s->nb_components > 1)
 359             s->avctx->pix_fmt = PIX_FMT_RGB24;
 360         else if(s->bits <= 8)
 361             s->avctx->pix_fmt = PIX_FMT_GRAY8;
 362         else
 363             s->avctx->pix_fmt = PIX_FMT_GRAY16;
 364     }
 365
 366     if(s->picture_ptr->data[0])
 367         s->avctx->release_buffer(s->avctx, s->picture_ptr);
 368
 369     if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){
 370         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 371         return -1;
 372     }
 373     s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;
 374     s->picture_ptr->key_frame= 1;
 375     s->got_picture = 1;
 376
 377     for(i=0; i<3; i++){
 378         s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;
 379     }
 380
 381 //    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
 382
 383     if (len != (8+(3*nb_components)))
 384     {
 385         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
 386     }
 387
 388     /* totally blank picture as progressive JPEG will only add details to it */
 389     if(s->progressive){
 390         int bw = (width  + s->h_max*8-1) / (s->h_max*8);
 391         int bh = (height + s->v_max*8-1) / (s->v_max*8);
 392         for(i=0; i<s->nb_components; i++) {
 393             int size = bw * bh * s->h_count[i] * s->v_count[i];
 394             av_freep(&s->blocks[i]);
 395             av_freep(&s->last_nnz[i]);
 396             s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
 397             s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
 398             s->block_stride[i] = bw * s->h_count[i];
 399         }
 400         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
 401     }
 402     return 0;
 403 }
 404
 405 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
 406 {
 407     int code;
 408     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
 409     if (code < 0)
 410     {
 411         av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
 412                &s->vlcs[0][dc_index]);
 413         return 0xffff;
 414     }
 415
 416     if(code)
 417         return get_xbits(&s->gb, code);
 418     else
 419         return 0;
 420 }
 421
 422 /* decode block and dequantize */
 423 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
 424                         int component, int dc_index, int ac_index, int16_t *quant_matrix)
 425 {
 426     int code, i, j, level, val;
 427
 428     /* DC coef */
 429     val = mjpeg_decode_dc(s, dc_index);
 430     if (val == 0xffff) {
 431         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 432         return -1;
 433     }
 434     val = val * quant_matrix[0] + s->last_dc[component];
 435     s->last_dc[component] = val;
 436     block[0] = val;
 437     /* AC coefs */
 438     i = 0;
 439     {OPEN_READER(re, &s->gb);
 440     do {
 441         UPDATE_CACHE(re, &s->gb);
 442         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
 443
 444         i += ((unsigned)code) >> 4;
 445             code &= 0xf;
 446         if(code){
 447             if(code > MIN_CACHE_BITS - 16){
 448                 UPDATE_CACHE(re, &s->gb);
 449             }
 450             {
 451                 int cache=GET_CACHE(re,&s->gb);
 452                 int sign=(~cache)>>31;
 453                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 454             }
 455
 456             LAST_SKIP_BITS(re, &s->gb, code);
 457
 458             if (i > 63) {
 459                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 460                 return -1;
 461             }
 462             j = s->scantable.permutated[i];
 463             block[j] = level * quant_matrix[j];
 464         }
 465     }while(i<63);
 466     CLOSE_READER(re, &s->gb);}
 467
 468     return 0;
 469 }
 470
 471 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
 472                                  int dc_index, int16_t *quant_matrix, int Al)
 473 {
 474     int val;
 475     s->dsp.clear_block(block);
 476     val = mjpeg_decode_dc(s, dc_index);
 477     if (val == 0xffff) {
 478         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 479         return -1;
 480     }
 481     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
 482     s->last_dc[component] = val;
 483     block[0] = val;
 484     return 0;
 485 }
 486
 487 /* decode block and dequantize - progressive JPEG version */
 488 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 489                                     int ac_index, int16_t *quant_matrix,
 490                                     int ss, int se, int Al, int *EOBRUN)
 491 {
 492     int code, i, j, level, val, run;
 493
 494     if(*EOBRUN){
 495         (*EOBRUN)--;
 496         return 0;
 497     }
 498     {OPEN_READER(re, &s->gb);
 499     for(i=ss;;i++) {
 500         UPDATE_CACHE(re, &s->gb);
 501         GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 502
 503         run = ((unsigned) code) >> 4;
 504         code &= 0xF;
 505         if(code) {
 506             i += run;
 507             if(code > MIN_CACHE_BITS - 16){
 508                 UPDATE_CACHE(re, &s->gb);
 509             }
 510             {
 511                 int cache=GET_CACHE(re,&s->gb);
 512                 int sign=(~cache)>>31;
 513                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 514             }
 515
 516             LAST_SKIP_BITS(re, &s->gb, code);
 517
 518             if (i >= se) {
 519                 if(i == se){
 520                     j = s->scantable.permutated[se];
 521                     block[j] = level * quant_matrix[j] << Al;
 522                     break;
 523                 }
 524                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 525                 return -1;
 526             }
 527             j = s->scantable.permutated[i];
 528             block[j] = level * quant_matrix[j] << Al;
 529         }else{
 530             if(run == 0xF){// ZRL - skip 15 coefficients
 531                 i += 15;
 532                 if (i >= se) {
 533                     av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
 534                     return -1;
 535                 }
 536             }else{
 537                 val = (1 << run);
 538                 if(run){
 539                     UPDATE_CACHE(re, &s->gb);
 540                     val += NEG_USR32(GET_CACHE(re, &s->gb), run);
 541                     LAST_SKIP_BITS(re, &s->gb, run);
 542                 }
 543                 *EOBRUN = val - 1;
 544                 break;
 545             }
 546         }
 547     }
 548     CLOSE_READER(re, &s->gb);}
 549     if(i > *last_nnz)
 550         *last_nnz = i;
 551     return 0;
 552 }
 553
 554 #define REFINE_BIT(j) {\
 555     UPDATE_CACHE(re, &s->gb);\
 556     sign = block[j]>>15;\
 557     block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
 558     LAST_SKIP_BITS(re, &s->gb, 1);\
 559 }
 560
 561 #define ZERO_RUN \
 562 for(;;i++) {\
 563     if(i > last) {\
 564         i += run;\
 565         if(i > se) {\
 566             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
 567             return -1;\
 568         }\
 569         break;\
 570     }\
 571     j = s->scantable.permutated[i];\
 572     if(block[j])\
 573         REFINE_BIT(j)\
 574     else if(run-- == 0)\
 575         break;\
 576 }
 577
 578 /* decode block and dequantize - progressive JPEG refinement pass */
 579 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 580                         int ac_index, int16_t *quant_matrix,
 581                         int ss, int se, int Al, int *EOBRUN)
 582 {
 583     int code, i=ss, j, sign, val, run;
 584     int last = FFMIN(se, *last_nnz);
 585
 586     OPEN_READER(re, &s->gb);
 587     if(*EOBRUN)
 588         (*EOBRUN)--;
 589     else {
 590         for(;;i++) {
 591             UPDATE_CACHE(re, &s->gb);
 592             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 593
 594             if(code & 0xF) {
 595                 run = ((unsigned) code) >> 4;
 596                 UPDATE_CACHE(re, &s->gb);
 597                 val = SHOW_UBITS(re, &s->gb, 1);
 598                 LAST_SKIP_BITS(re, &s->gb, 1);
 599                 ZERO_RUN;
 600                 j = s->scantable.permutated[i];
 601                 val--;
 602                 block[j] = ((quant_matrix[j]^val)-val) << Al;
 603                 if(i == se) {
 604                     if(i > *last_nnz)
 605                         *last_nnz = i;
 606                     CLOSE_READER(re, &s->gb);
 607                     return 0;
 608                 }
 609             }else{
 610                 run = ((unsigned) code) >> 4;
 611                 if(run == 0xF){
 612                     ZERO_RUN;
 613                 }else{
 614                     val = run;
 615                     run = (1 << run);
 616                     if(val) {
 617                         UPDATE_CACHE(re, &s->gb);
 618                         run += SHOW_UBITS(re, &s->gb, val);
 619                         LAST_SKIP_BITS(re, &s->gb, val);
 620                     }
 621                     *EOBRUN = run - 1;
 622                     break;
 623                 }
 624             }
 625         }
 626
 627         if(i > *last_nnz)
 628             *last_nnz = i;
 629     }
 630
 631     for(;i<=last;i++) {
 632         j = s->scantable.permutated[i];
 633         if(block[j])
 634             REFINE_BIT(j)
 635     }
 636     CLOSE_READER(re, &s->gb);
 637
 638     return 0;
 639 }
 640 #undef REFINE_BIT
 641 #undef ZERO_RUN
 642
 643 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
 644     int i, mb_x, mb_y;
 645     uint16_t (*buffer)[4];
 646     int left[3], top[3], topleft[3];
 647     const int linesize= s->linesize[0];
 648     const int mask= (1<<s->bits)-1;
 649
 650     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
 651     buffer= s->ljpeg_buffer;
 652
 653     for(i=0; i<3; i++){
 654         buffer[0][i]= 1 << (s->bits + point_transform - 1);
 655     }
 656     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 657         const int modified_predictor= mb_y ? predictor : 1;
 658         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
 659
 660         if (s->interlaced && s->bottom_field)
 661             ptr += linesize >> 1;
 662
 663         for(i=0; i<3; i++){
 664             top[i]= left[i]= topleft[i]= buffer[0][i];
 665         }
 666         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 667             if (s->restart_interval && !s->restart_count)
 668                 s->restart_count = s->restart_interval;
 669
 670             for(i=0;i<3;i++) {
 671                 int pred;
 672
 673                 topleft[i]= top[i];
 674                 top[i]= buffer[mb_x][i];
 675
 676                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 677
 678                 left[i]=
 679                 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
 680             }
 681
 682             if (s->restart_interval && !--s->restart_count) {
 683                 align_get_bits(&s->gb);
 684                 skip_bits(&s->gb, 16); /* skip RSTn */
 685             }
 686         }
 687
 688         if(s->rct){
 689             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 690                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
 691                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
 692                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
 693             }
 694         }else if(s->pegasus_rct){
 695             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 696                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
 697                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
 698                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
 699             }
 700         }else{
 701             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 702                 ptr[4*mb_x+0] = buffer[mb_x][2];
 703                 ptr[4*mb_x+1] = buffer[mb_x][1];
 704                 ptr[4*mb_x+2] = buffer[mb_x][0];
 705             }
 706         }
 707     }
 708     return 0;
 709 }
 710
 711 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
 712     int i, mb_x, mb_y;
 713     const int nb_components=3;
 714
 715     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 716         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 717             if (s->restart_interval && !s->restart_count)
 718                 s->restart_count = s->restart_interval;
 719
 720             if(mb_x==0 || mb_y==0 || s->interlaced){
 721                 for(i=0;i<nb_components;i++) {
 722                     uint8_t *ptr;
 723                     int n, h, v, x, y, c, j, linesize;
 724                     n = s->nb_blocks[i];
 725                     c = s->comp_index[i];
 726                     h = s->h_scount[i];
 727                     v = s->v_scount[i];
 728                     x = 0;
 729                     y = 0;
 730                     linesize= s->linesize[c];
 731
 732                     for(j=0; j<n; j++) {
 733                         int pred;
 734
 735                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 736                         if(y==0 && mb_y==0){
 737                             if(x==0 && mb_x==0){
 738                                 pred= 128 << point_transform;
 739                             }else{
 740                                 pred= ptr[-1];
 741                             }
 742                         }else{
 743                             if(x==0 && mb_x==0){
 744                                 pred= ptr[-linesize];
 745                             }else{
 746                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 747                             }
 748                         }
 749
 750                         if (s->interlaced && s->bottom_field)
 751                             ptr += linesize >> 1;
 752                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
 753
 754                         if (++x == h) {
 755                             x = 0;
 756                             y++;
 757                         }
 758                     }
 759                 }
 760             }else{
 761                 for(i=0;i<nb_components;i++) {
 762                     uint8_t *ptr;
 763                     int n, h, v, x, y, c, j, linesize;
 764                     n = s->nb_blocks[i];
 765                     c = s->comp_index[i];
 766                     h = s->h_scount[i];
 767                     v = s->v_scount[i];
 768                     x = 0;
 769                     y = 0;
 770                     linesize= s->linesize[c];
 771
 772                     for(j=0; j<n; j++) {
 773                         int pred;
 774
 775                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 776                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 777                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
 778                         if (++x == h) {
 779                             x = 0;
 780                             y++;
 781                         }
 782                     }
 783                 }
 784             }
 785             if (s->restart_interval && !--s->restart_count) {
 786                 align_get_bits(&s->gb);
 787                 skip_bits(&s->gb, 16); /* skip RSTn */
 788             }
 789         }
 790     }
 791     return 0;
 792 }
 793
 794 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
 795                                               int linesize, int lowres)
 796 {
 797     switch (lowres) {
 798     case 0: copy_block8(dst, src, linesize, linesize, 8);
 799         break;
 800     case 1: copy_block4(dst, src, linesize, linesize, 4);
 801         break;
 802     case 2: copy_block2(dst, src, linesize, linesize, 2);
 803         break;
 804     case 3: *dst = *src;
 805         break;
 806     }
 807 }
 808
 809 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,
 810                              const uint8_t *mb_bitmask, const AVFrame *reference){
 811     int i, mb_x, mb_y;
 812     uint8_t* data[MAX_COMPONENTS];
 813     const uint8_t *reference_data[MAX_COMPONENTS];
 814     int linesize[MAX_COMPONENTS];
 815     GetBitContext mb_bitmask_gb;
 816
 817     if (mb_bitmask) {
 818         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
 819     }
 820
 821     if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
 822         av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
 823         s->flipped = 0;
 824     }
 825     for(i=0; i < nb_components; i++) {
 826         int c = s->comp_index[i];
 827         data[c] = s->picture_ptr->data[c];
 828         reference_data[c] = reference ? reference->data[c] : NULL;
 829         linesize[c]=s->linesize[c];
 830         s->coefs_finished[c] |= 1;
 831         if(s->flipped) {
 832             //picture should be flipped upside-down for this codec
 833             int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
 834             data[c] += offset;
 835             reference_data[c] += offset;
 836             linesize[c] *= -1;
 837         }
 838     }
 839
 840     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 841         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 842             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
 843
 844             if (s->restart_interval && !s->restart_count)
 845                 s->restart_count = s->restart_interval;
 846
 847             if(get_bits_count(&s->gb)>s->gb.size_in_bits){
 848                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 849                 return -1;
 850             }
 851             for(i=0;i<nb_components;i++) {
 852                 uint8_t *ptr;
 853                 int n, h, v, x, y, c, j;
 854                 int block_offset;
 855                 n = s->nb_blocks[i];
 856                 c = s->comp_index[i];
 857                 h = s->h_scount[i];
 858                 v = s->v_scount[i];
 859                 x = 0;
 860                 y = 0;
 861                 for(j=0;j<n;j++) {
 862                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
 863                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
 864
 865                     if(s->interlaced && s->bottom_field)
 866                         block_offset += linesize[c] >> 1;
 867                     ptr = data[c] + block_offset;
 868                     if(!s->progressive) {
 869                         if (copy_mb) {
 870                             mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);
 871                         } else {
 872                         s->dsp.clear_block(s->block);
 873                         if(decode_block(s, s->block, i,
 874                                      s->dc_index[i], s->ac_index[i],
 875                                      s->quant_matrixes[ s->quant_index[c] ]) < 0) {
 876                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 877                             return -1;
 878                         }
 879                         s->dsp.idct_put(ptr, linesize[c], s->block);
 880                         }
 881                     } else {
 882                         int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
 883                         DCTELEM *block = s->blocks[c][block_idx];
 884                         if(Ah)
 885                             block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
 886                         else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
 887                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 888                             return -1;
 889                         }
 890                     }
 891 //                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
 892 //av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
 893                     if (++x == h) {
 894                         x = 0;
 895                         y++;
 896                     }
 897                 }
 898             }
 899
 900             if (s->restart_interval) --s->restart_count;
 901             i= 8+((-get_bits_count(&s->gb))&7);
 902             if (s->restart_interval && show_bits(&s->gb, i)  == (1<<i)-1){ /* skip RSTn */
 903                 int pos= get_bits_count(&s->gb);
 904                 align_get_bits(&s->gb);
 905                 while(get_bits_count(&s->gb) < s->gb.size_in_bits && show_bits(&s->gb, 8) == 0xFF)
 906                     skip_bits(&s->gb, 8);
 907                 if(get_bits_count(&s->gb) < s->gb.size_in_bits && (get_bits(&s->gb, 8)&0xF8) == 0xD0){
 908                     for (i=0; i<nb_components; i++) /* reset dc */
 909                         s->last_dc[i] = 1024;
 910                 }else{
 911                     skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
 912                 }
 913             }
 914         }
 915     }
 916     return 0;
 917 }
 918
 919 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
 920     int mb_x, mb_y;
 921     int EOBRUN = 0;
 922     int c = s->comp_index[0];
 923     uint8_t* data = s->picture.data[c];
 924     int linesize = s->linesize[c];
 925     int last_scan = 0;
 926     int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
 927
 928     if(!Al) {
 929         s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
 930         last_scan = !~s->coefs_finished[c];
 931     }
 932
 933     if(s->interlaced && s->bottom_field)
 934         data += linesize >> 1;
 935
 936     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 937         uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
 938         int block_idx = mb_y * s->block_stride[c];
 939         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
 940         uint8_t *last_nnz = &s->last_nnz[c][block_idx];
 941         for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
 942             int ret;
 943             if(Ah)
 944                 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
 945                                               quant_matrix, ss, se, Al, &EOBRUN);
 946             else
 947                 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
 948                                                quant_matrix, ss, se, Al, &EOBRUN);
 949             if(ret < 0) {
 950                 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 951                 return -1;
 952             }
 953             if(last_scan) {
 954                 s->dsp.idct_put(ptr, linesize, *block);
 955                 ptr += 8 >> s->avctx->lowres;
 956             }
 957         }
 958     }
 959     return 0;
 960 }
 961
 962 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
 963                         const uint8_t *mb_bitmask, const AVFrame *reference)
 964 {
 965     int len, nb_components, i, h, v, predictor, point_transform;
 966     int index, id;
 967     const int block_size= s->lossless ? 1 : 8;
 968     int ilv, prev_shift;
 969
 970     /* XXX: verify len field validity */
 971     len = get_bits(&s->gb, 16);
 972     nb_components = get_bits(&s->gb, 8);
 973     if (nb_components == 0 || nb_components > MAX_COMPONENTS){
 974         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
 975         return -1;
 976     }
 977     if (len != 6+2*nb_components)
 978     {
 979         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
 980         return -1;
 981     }
 982     for(i=0;i<nb_components;i++) {
 983         id = get_bits(&s->gb, 8) - 1;
 984         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
 985         /* find component index */
 986         for(index=0;index<s->nb_components;index++)
 987             if (id == s->component_id[index])
 988                 break;
 989         if (index == s->nb_components)
 990         {
 991             av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
 992             return -1;
 993         }
 994         /* Metasoft MJPEG codec has Cb and Cr swapped */
 995         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
 996             && nb_components == 3 && s->nb_components == 3 && i)
 997             index = 3 - i;
 998
 999         if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1000             index = (i+2)%3;
1001
1002         s->comp_index[i] = index;
1003
1004         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1005         s->h_scount[i] = s->h_count[index];
1006         s->v_scount[i] = s->v_count[index];
1007
1008         s->dc_index[i] = get_bits(&s->gb, 4);
1009         s->ac_index[i] = get_bits(&s->gb, 4);
1010
1011         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
1012             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1013             goto out_of_range;
1014         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
1015             goto out_of_range;
1016     }
1017
1018     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1019     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
1020     if(s->avctx->codec_tag != AV_RL32("CJPG")){
1021         prev_shift = get_bits(&s->gb, 4); /* Ah */
1022         point_transform= get_bits(&s->gb, 4); /* Al */
1023     }else
1024         prev_shift= point_transform= 0;
1025
1026     for(i=0;i<nb_components;i++)
1027         s->last_dc[i] = 1024;
1028
1029     if (nb_components > 1) {
1030         /* interleaved stream */
1031         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
1032         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1033     } else if(!s->ls) { /* skip this for JPEG-LS */
1034         h = s->h_max / s->h_scount[0];
1035         v = s->v_max / s->v_scount[0];
1036         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
1037         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1038         s->nb_blocks[0] = 1;
1039         s->h_scount[0] = 1;
1040         s->v_scount[0] = 1;
1041     }
1042
1043     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1044         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1045                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1046                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1047
1048
1049     /* mjpeg-b can have padding bytes between sos and image data, skip them */
1050     for (i = s->mjpb_skiptosod; i > 0; i--)
1051         skip_bits(&s->gb, 8);
1052
1053     if(s->lossless){
1054         av_assert0(s->picture_ptr == &s->picture);
1055         if(CONFIG_JPEGLS_DECODER && s->ls){
1056 //            for(){
1057 //            reset_ls_coding_parameters(s, 0);
1058
1059             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1060                 return -1;
1061         }else{
1062             if(s->rgb){
1063                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1064                     return -1;
1065             }else{
1066                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1067                     return -1;
1068             }
1069         }
1070     }else{
1071         if(s->progressive && predictor) {
1072             av_assert0(s->picture_ptr == &s->picture);
1073             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
1074                 return -1;
1075         } else {
1076             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1077                                  mb_bitmask, reference) < 0)
1078                 return -1;
1079         }
1080     }
1081     emms_c();
1082     return 0;
1083  out_of_range:
1084     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1085     return -1;
1086 }
1087
1088 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1089 {
1090     if (get_bits(&s->gb, 16) != 4)
1091         return -1;
1092     s->restart_interval = get_bits(&s->gb, 16);
1093     s->restart_count = 0;
1094     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1095
1096     return 0;
1097 }
1098
1099 static int mjpeg_decode_app(MJpegDecodeContext *s)
1100 {
1101     int len, id, i;
1102
1103     len = get_bits(&s->gb, 16);
1104     if (len < 5)
1105         return -1;
1106     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1107         return -1;
1108
1109     id = get_bits_long(&s->gb, 32);
1110     id = av_be2ne32(id);
1111     len -= 6;
1112
1113     if(s->avctx->debug & FF_DEBUG_STARTCODE){
1114         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1115     }
1116
1117     /* buggy AVID, it puts EOI only at every 10th frame */
1118     /* also this fourcc is used by non-avid files too, it holds some
1119        informations, but it's always present in AVID creates files */
1120     if (id == AV_RL32("AVI1"))
1121     {
1122         /* structure:
1123             4bytes      AVI1
1124             1bytes      polarity
1125             1bytes      always zero
1126             4bytes      field_size
1127             4bytes      field_size_less_padding
1128         */
1129             s->buggy_avid = 1;
1130 //        if (s->first_picture)
1131 //            printf("mjpeg: workarounding buggy AVID\n");
1132         i = get_bits(&s->gb, 8); len--;
1133         av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1134 #if 0
1135         skip_bits(&s->gb, 8);
1136         skip_bits(&s->gb, 32);
1137         skip_bits(&s->gb, 32);
1138         len -= 10;
1139 #endif
1140 //        if (s->interlace_polarity)
1141 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1142         goto out;
1143     }
1144
1145 //    len -= 2;
1146
1147     if (id == AV_RL32("JFIF"))
1148     {
1149         int t_w, t_h, v1, v2;
1150         skip_bits(&s->gb, 8); /* the trailing zero-byte */
1151         v1= get_bits(&s->gb, 8);
1152         v2= get_bits(&s->gb, 8);
1153         skip_bits(&s->gb, 8);
1154
1155         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1156         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1157
1158         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1159             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1160                 v1, v2,
1161                 s->avctx->sample_aspect_ratio.num,
1162                 s->avctx->sample_aspect_ratio.den
1163             );
1164
1165         t_w = get_bits(&s->gb, 8);
1166         t_h = get_bits(&s->gb, 8);
1167         if (t_w && t_h)
1168         {
1169             /* skip thumbnail */
1170             if (len-10-(t_w*t_h*3) > 0)
1171                 len -= t_w*t_h*3;
1172         }
1173         len -= 10;
1174         goto out;
1175     }
1176
1177     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1178     {
1179         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1180             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1181         skip_bits(&s->gb, 16); /* version */
1182         skip_bits(&s->gb, 16); /* flags0 */
1183         skip_bits(&s->gb, 16); /* flags1 */
1184         skip_bits(&s->gb, 8);  /* transform */
1185         len -= 7;
1186         goto out;
1187     }
1188
1189     if (id == AV_RL32("LJIF")){
1190         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1191             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1192         skip_bits(&s->gb, 16); /* version ? */
1193         skip_bits(&s->gb, 16); /* unknwon always 0? */
1194         skip_bits(&s->gb, 16); /* unknwon always 0? */
1195         skip_bits(&s->gb, 16); /* unknwon always 0? */
1196         switch( get_bits(&s->gb, 8)){
1197         case 1:
1198             s->rgb= 1;
1199             s->pegasus_rct=0;
1200             break;
1201         case 2:
1202             s->rgb= 1;
1203             s->pegasus_rct=1;
1204             break;
1205         default:
1206             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1207         }
1208         len -= 9;
1209         goto out;
1210     }
1211
1212     /* Apple MJPEG-A */
1213     if ((s->start_code == APP1) && (len > (0x28 - 8)))
1214     {
1215         id = get_bits_long(&s->gb, 32);
1216         id = av_be2ne32(id);
1217         len -= 4;
1218         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1219         {
1220 #if 0
1221             skip_bits(&s->gb, 32); /* field size */
1222             skip_bits(&s->gb, 32); /* pad field size */
1223             skip_bits(&s->gb, 32); /* next off */
1224             skip_bits(&s->gb, 32); /* quant off */
1225             skip_bits(&s->gb, 32); /* huff off */
1226             skip_bits(&s->gb, 32); /* image off */
1227             skip_bits(&s->gb, 32); /* scan off */
1228             skip_bits(&s->gb, 32); /* data off */
1229 #endif
1230             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1231                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1232         }
1233     }
1234
1235 out:
1236     /* slow but needed for extreme adobe jpegs */
1237     if (len < 0)
1238         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1239     while(--len > 0)
1240         skip_bits(&s->gb, 8);
1241
1242     return 0;
1243 }
1244
1245 static int mjpeg_decode_com(MJpegDecodeContext *s)
1246 {
1247     int len = get_bits(&s->gb, 16);
1248     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1249         char *cbuf = av_malloc(len - 1);
1250         if (cbuf) {
1251             int i;
1252             for (i = 0; i < len - 2; i++)
1253                 cbuf[i] = get_bits(&s->gb, 8);
1254             if (i > 0 && cbuf[i-1] == '\n')
1255                 cbuf[i-1] = 0;
1256             else
1257                 cbuf[i] = 0;
1258
1259             if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1260                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1261
1262             /* buggy avid, it puts EOI only at every 10th frame */
1263             if (!strcmp(cbuf, "AVID"))
1264             {
1265                 s->buggy_avid = 1;
1266                 //        if (s->first_picture)
1267                 //            printf("mjpeg: workarounding buggy AVID\n");
1268             }
1269             else if(!strcmp(cbuf, "CS=ITU601")){
1270                 s->cs_itu601= 1;
1271             }
1272             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1273                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
1274                 s->flipped = 1;
1275             }
1276
1277             av_free(cbuf);
1278         }
1279     }
1280
1281     return 0;
1282 }
1283
1284 /* return the 8 bit start code value and update the search
1285    state. Return -1 if no start code found */
1286 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1287 {
1288     const uint8_t *buf_ptr;
1289     unsigned int v, v2;
1290     int val;
1291     int skipped=0;
1292
1293     buf_ptr = *pbuf_ptr;
1294     while (buf_ptr < buf_end) {
1295         v = *buf_ptr++;
1296         v2 = *buf_ptr;
1297         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1298             val = *buf_ptr++;
1299             goto found;
1300         }
1301         skipped++;
1302     }
1303     val = -1;
1304 found:
1305     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1306     *pbuf_ptr = buf_ptr;
1307     return val;
1308 }
1309
1310 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1311                          const uint8_t **buf_ptr, const uint8_t *buf_end,
1312                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
1313 {
1314     int start_code;
1315     start_code = find_marker(buf_ptr, buf_end);
1316
1317                 if ((buf_end - *buf_ptr) > s->buffer_size)
1318                 {
1319                     av_free(s->buffer);
1320                     s->buffer_size = buf_end - *buf_ptr;
1321                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1322                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1323                         s->buffer_size);
1324                 }
1325
1326                 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1327                 if (start_code == SOS && !s->ls)
1328                 {
1329                     const uint8_t *src = *buf_ptr;
1330                     uint8_t *dst = s->buffer;
1331
1332                     while (src<buf_end)
1333                     {
1334                         uint8_t x = *(src++);
1335
1336                         *(dst++) = x;
1337                         if (s->avctx->codec_id != CODEC_ID_THP)
1338                         {
1339                             if (x == 0xff) {
1340                                 while (src < buf_end && x == 0xff)
1341                                     x = *(src++);
1342
1343                                 if (x >= 0xd0 && x <= 0xd7)
1344                                     *(dst++) = x;
1345                                 else if (x)
1346                                     break;
1347                             }
1348                         }
1349                     }
1350                     *unescaped_buf_ptr  = s->buffer;
1351                     *unescaped_buf_size = dst - s->buffer;
1352
1353                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1354                            (buf_end - *buf_ptr) - (dst - s->buffer));
1355                 }
1356                 else if(start_code == SOS && s->ls){
1357                     const uint8_t *src = *buf_ptr;
1358                     uint8_t *dst = s->buffer;
1359                     int bit_count = 0;
1360                     int t = 0, b = 0;
1361                     PutBitContext pb;
1362
1363                     s->cur_scan++;
1364
1365                     /* find marker */
1366                     while (src + t < buf_end){
1367                         uint8_t x = src[t++];
1368                         if (x == 0xff){
1369                             while((src + t < buf_end) && x == 0xff)
1370                                 x = src[t++];
1371                             if (x & 0x80) {
1372                                 t -= 2;
1373                                 break;
1374                             }
1375                         }
1376                     }
1377                     bit_count = t * 8;
1378
1379                     init_put_bits(&pb, dst, t);
1380
1381                     /* unescape bitstream */
1382                     while(b < t){
1383                         uint8_t x = src[b++];
1384                         put_bits(&pb, 8, x);
1385                         if(x == 0xFF){
1386                             x = src[b++];
1387                             put_bits(&pb, 7, x);
1388                             bit_count--;
1389                         }
1390                     }
1391                     flush_put_bits(&pb);
1392
1393                     *unescaped_buf_ptr  = dst;
1394                     *unescaped_buf_size = (bit_count + 7) >> 3;
1395                 }
1396                 else
1397                 {
1398                     *unescaped_buf_ptr  = *buf_ptr;
1399                     *unescaped_buf_size = buf_end - *buf_ptr;
1400                 }
1401
1402     return start_code;
1403 }
1404
1405 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1406                               void *data, int *data_size,
1407                               AVPacket *avpkt)
1408 {
1409     const uint8_t *buf = avpkt->data;
1410     int buf_size = avpkt->size;
1411     MJpegDecodeContext *s = avctx->priv_data;
1412     const uint8_t *buf_end, *buf_ptr;
1413     const uint8_t *unescaped_buf_ptr;
1414     int unescaped_buf_size;
1415     int start_code;
1416     AVFrame *picture = data;
1417
1418     s->got_picture = 0; // picture from previous image can not be reused
1419     buf_ptr = buf;
1420     buf_end = buf + buf_size;
1421     while (buf_ptr < buf_end) {
1422         /* find start next marker */
1423         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1424                                           &unescaped_buf_ptr, &unescaped_buf_size);
1425         {
1426             /* EOF */
1427             if (start_code < 0) {
1428                 goto the_end;
1429             } else {
1430                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1431
1432                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
1433
1434                 s->start_code = start_code;
1435                 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1436                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1437                 }
1438
1439                 /* process markers */
1440                 if (start_code >= 0xd0 && start_code <= 0xd7) {
1441                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1442                     /* APP fields */
1443                 } else if (start_code >= APP0 && start_code <= APP15) {
1444                     mjpeg_decode_app(s);
1445                     /* Comment */
1446                 } else if (start_code == COM){
1447                     mjpeg_decode_com(s);
1448                 }
1449
1450                 switch(start_code) {
1451                 case SOI:
1452                     s->restart_interval = 0;
1453
1454                     s->restart_count = 0;
1455                     /* nothing to do on SOI */
1456                     break;
1457                 case DQT:
1458                     ff_mjpeg_decode_dqt(s);
1459                     break;
1460                 case DHT:
1461                     if(ff_mjpeg_decode_dht(s) < 0){
1462                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1463                         return -1;
1464                     }
1465                     break;
1466                 case SOF0:
1467                 case SOF1:
1468                     s->lossless=0;
1469                     s->ls=0;
1470                     s->progressive=0;
1471                     if (ff_mjpeg_decode_sof(s) < 0)
1472                         return -1;
1473                     break;
1474                 case SOF2:
1475                     s->lossless=0;
1476                     s->ls=0;
1477                     s->progressive=1;
1478                     if (ff_mjpeg_decode_sof(s) < 0)
1479                         return -1;
1480                     break;
1481                 case SOF3:
1482                     s->lossless=1;
1483                     s->ls=0;
1484                     s->progressive=0;
1485                     if (ff_mjpeg_decode_sof(s) < 0)
1486                         return -1;
1487                     break;
1488                 case SOF48:
1489                     s->lossless=1;
1490                     s->ls=1;
1491                     s->progressive=0;
1492                     if (ff_mjpeg_decode_sof(s) < 0)
1493                         return -1;
1494                     break;
1495                 case LSE:
1496                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1497                         return -1;
1498                     break;
1499                 case EOI:
1500 eoi_parser:
1501                     s->cur_scan = 0;
1502                     if (!s->got_picture) {
1503                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1504                         break;
1505                     }
1506                     if (s->interlaced) {
1507                         s->bottom_field ^= 1;
1508                         /* if not bottom field, do not output image yet */
1509                         if (s->bottom_field == !s->interlace_polarity)
1510                             break;
1511                     }
1512                     *picture = *s->picture_ptr;
1513                     *data_size = sizeof(AVFrame);
1514
1515                     if(!s->lossless){
1516                         picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1517                         picture->qstride= 0;
1518                         picture->qscale_table= s->qscale_table;
1519                         memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1520                         if(avctx->debug & FF_DEBUG_QP)
1521                             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1522                         picture->quality*= FF_QP2LAMBDA;
1523                     }
1524
1525                     goto the_end;
1526                 case SOS:
1527                     if (!s->got_picture) {
1528                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1529                         break;
1530                     }
1531                     if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1532                         (avctx->err_recognition & AV_EF_EXPLODE))
1533                       return AVERROR_INVALIDDATA;
1534                     break;
1535                 case DRI:
1536                     mjpeg_decode_dri(s);
1537                     break;
1538                 case SOF5:
1539                 case SOF6:
1540                 case SOF7:
1541                 case SOF9:
1542                 case SOF10:
1543                 case SOF11:
1544                 case SOF13:
1545                 case SOF14:
1546                 case SOF15:
1547                 case JPG:
1548                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1549                     break;
1550 //                default:
1551 //                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1552 //                    break;
1553                 }
1554
1555                 /* eof process start code */
1556                 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1557                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1558                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1559             }
1560         }
1561     }
1562     if (s->got_picture) {
1563         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1564         goto eoi_parser;
1565     }
1566     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1567     return -1;
1568 the_end:
1569     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1570 //    return buf_end - buf_ptr;
1571     return buf_ptr - buf;
1572 }
1573
1574 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1575 {
1576     MJpegDecodeContext *s = avctx->priv_data;
1577     int i, j;
1578
1579     if (s->picture_ptr && s->picture_ptr->data[0])
1580         avctx->release_buffer(avctx, s->picture_ptr);
1581
1582     av_free(s->buffer);
1583     av_free(s->qscale_table);
1584     av_freep(&s->ljpeg_buffer);
1585     s->ljpeg_buffer_size=0;
1586
1587     for(i=0;i<3;i++) {
1588         for(j=0;j<4;j++)
1589             free_vlc(&s->vlcs[i][j]);
1590     }
1591     for(i=0; i<MAX_COMPONENTS; i++) {
1592         av_freep(&s->blocks[i]);
1593         av_freep(&s->last_nnz[i]);
1594     }
1595     return 0;
1596 }
1597
1598 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1599 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1600 static const AVOption options[] = {
1601     { "extern_huff",        "Use external huffman table.",  OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1602     { NULL },
1603 };
1604
1605 static const AVClass mjpegdec_class = {
1606     .class_name = "MJPEG decoder",
1607     .item_name  = av_default_item_name,
1608     .option     = options,
1609     .version    = LIBAVUTIL_VERSION_INT,
1610 };
1611
1612 AVCodec ff_mjpeg_decoder = {
1613     .name           = "mjpeg",
1614     .type           = AVMEDIA_TYPE_VIDEO,
1615     .id             = CODEC_ID_MJPEG,
1616     .priv_data_size = sizeof(MJpegDecodeContext),
1617     .init           = ff_mjpeg_decode_init,
1618     .close          = ff_mjpeg_decode_end,
1619     .decode         = ff_mjpeg_decode_frame,
1620     .capabilities   = CODEC_CAP_DR1,
1621     .max_lowres = 3,
1622     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1623     .priv_class     = &mjpegdec_class,
1624 };
1625
1626 AVCodec ff_thp_decoder = {
1627     .name           = "thp",
1628     .type           = AVMEDIA_TYPE_VIDEO,
1629     .id             = CODEC_ID_THP,
1630     .priv_data_size = sizeof(MJpegDecodeContext),
1631     .init           = ff_mjpeg_decode_init,
1632     .close          = ff_mjpeg_decode_end,
1633     .decode         = ff_mjpeg_decode_frame,
1634     .capabilities   = CODEC_CAP_DR1,
1635     .max_lowres = 3,
1636     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1637 };