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             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
 330             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 331         }
 332         assert(s->nb_components==3);
 333         break;
 334     case 0x11000000:
 335         s->avctx->pix_fmt = PIX_FMT_GRAY8;
 336         break;
 337     case 0x12111100:
 338         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
 339         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 340         break;
 341     case 0x21111100:
 342         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
 343         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 344         break;
 345     case 0x22111100:
 346         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
 347         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 348         break;
 349     default:
 350         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
 351         return -1;
 352     }
 353     if(s->ls){
 354         if(s->nb_components > 1)
 355             s->avctx->pix_fmt = PIX_FMT_RGB24;
 356         else if(s->bits <= 8)
 357             s->avctx->pix_fmt = PIX_FMT_GRAY8;
 358         else
 359             s->avctx->pix_fmt = PIX_FMT_GRAY16;
 360     }
 361
 362     if(s->picture_ptr->data[0])
 363         s->avctx->release_buffer(s->avctx, s->picture_ptr);
 364
 365     if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){
 366         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 367         return -1;
 368     }
 369     s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;
 370     s->picture_ptr->key_frame= 1;
 371     s->got_picture = 1;
 372
 373     for(i=0; i<3; i++){
 374         s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;
 375     }
 376
 377 //    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
 378
 379     if (len != (8+(3*nb_components)))
 380     {
 381         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
 382     }
 383
 384     /* totally blank picture as progressive JPEG will only add details to it */
 385     if(s->progressive){
 386         int bw = (width  + s->h_max*8-1) / (s->h_max*8);
 387         int bh = (height + s->v_max*8-1) / (s->v_max*8);
 388         for(i=0; i<s->nb_components; i++) {
 389             int size = bw * bh * s->h_count[i] * s->v_count[i];
 390             av_freep(&s->blocks[i]);
 391             av_freep(&s->last_nnz[i]);
 392             s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
 393             s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
 394             s->block_stride[i] = bw * s->h_count[i];
 395         }
 396         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
 397     }
 398     return 0;
 399 }
 400
 401 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
 402 {
 403     int code;
 404     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
 405     if (code < 0)
 406     {
 407         av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
 408                &s->vlcs[0][dc_index]);
 409         return 0xffff;
 410     }
 411
 412     if(code)
 413         return get_xbits(&s->gb, code);
 414     else
 415         return 0;
 416 }
 417
 418 /* decode block and dequantize */
 419 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
 420                         int component, int dc_index, int ac_index, int16_t *quant_matrix)
 421 {
 422     int code, i, j, level, val;
 423
 424     /* DC coef */
 425     val = mjpeg_decode_dc(s, dc_index);
 426     if (val == 0xffff) {
 427         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 428         return -1;
 429     }
 430     val = val * quant_matrix[0] + s->last_dc[component];
 431     s->last_dc[component] = val;
 432     block[0] = val;
 433     /* AC coefs */
 434     i = 0;
 435     {OPEN_READER(re, &s->gb);
 436     do {
 437         UPDATE_CACHE(re, &s->gb);
 438         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
 439
 440         i += ((unsigned)code) >> 4;
 441             code &= 0xf;
 442         if(code){
 443             if(code > MIN_CACHE_BITS - 16){
 444                 UPDATE_CACHE(re, &s->gb);
 445             }
 446             {
 447                 int cache=GET_CACHE(re,&s->gb);
 448                 int sign=(~cache)>>31;
 449                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 450             }
 451
 452             LAST_SKIP_BITS(re, &s->gb, code);
 453
 454             if (i > 63) {
 455                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 456                 return -1;
 457             }
 458             j = s->scantable.permutated[i];
 459             block[j] = level * quant_matrix[j];
 460         }
 461     }while(i<63);
 462     CLOSE_READER(re, &s->gb);}
 463
 464     return 0;
 465 }
 466
 467 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
 468                                  int dc_index, int16_t *quant_matrix, int Al)
 469 {
 470     int val;
 471     s->dsp.clear_block(block);
 472     val = mjpeg_decode_dc(s, dc_index);
 473     if (val == 0xffff) {
 474         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 475         return -1;
 476     }
 477     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
 478     s->last_dc[component] = val;
 479     block[0] = val;
 480     return 0;
 481 }
 482
 483 /* decode block and dequantize - progressive JPEG version */
 484 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 485                                     int ac_index, int16_t *quant_matrix,
 486                                     int ss, int se, int Al, int *EOBRUN)
 487 {
 488     int code, i, j, level, val, run;
 489
 490     if(*EOBRUN){
 491         (*EOBRUN)--;
 492         return 0;
 493     }
 494     {OPEN_READER(re, &s->gb);
 495     for(i=ss;;i++) {
 496         UPDATE_CACHE(re, &s->gb);
 497         GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 498
 499         run = ((unsigned) code) >> 4;
 500         code &= 0xF;
 501         if(code) {
 502             i += run;
 503             if(code > MIN_CACHE_BITS - 16){
 504                 UPDATE_CACHE(re, &s->gb);
 505             }
 506             {
 507                 int cache=GET_CACHE(re,&s->gb);
 508                 int sign=(~cache)>>31;
 509                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 510             }
 511
 512             LAST_SKIP_BITS(re, &s->gb, code);
 513
 514             if (i >= se) {
 515                 if(i == se){
 516                     j = s->scantable.permutated[se];
 517                     block[j] = level * quant_matrix[j] << Al;
 518                     break;
 519                 }
 520                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 521                 return -1;
 522             }
 523             j = s->scantable.permutated[i];
 524             block[j] = level * quant_matrix[j] << Al;
 525         }else{
 526             if(run == 0xF){// ZRL - skip 15 coefficients
 527                 i += 15;
 528                 if (i >= se) {
 529                     av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
 530                     return -1;
 531                 }
 532             }else{
 533                 val = (1 << run);
 534                 if(run){
 535                     UPDATE_CACHE(re, &s->gb);
 536                     val += NEG_USR32(GET_CACHE(re, &s->gb), run);
 537                     LAST_SKIP_BITS(re, &s->gb, run);
 538                 }
 539                 *EOBRUN = val - 1;
 540                 break;
 541             }
 542         }
 543     }
 544     CLOSE_READER(re, &s->gb);}
 545     if(i > *last_nnz)
 546         *last_nnz = i;
 547     return 0;
 548 }
 549
 550 #define REFINE_BIT(j) {\
 551     UPDATE_CACHE(re, &s->gb);\
 552     sign = block[j]>>15;\
 553     block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
 554     LAST_SKIP_BITS(re, &s->gb, 1);\
 555 }
 556
 557 #define ZERO_RUN \
 558 for(;;i++) {\
 559     if(i > last) {\
 560         i += run;\
 561         if(i > se) {\
 562             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
 563             return -1;\
 564         }\
 565         break;\
 566     }\
 567     j = s->scantable.permutated[i];\
 568     if(block[j])\
 569         REFINE_BIT(j)\
 570     else if(run-- == 0)\
 571         break;\
 572 }
 573
 574 /* decode block and dequantize - progressive JPEG refinement pass */
 575 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 576                         int ac_index, int16_t *quant_matrix,
 577                         int ss, int se, int Al, int *EOBRUN)
 578 {
 579     int code, i=ss, j, sign, val, run;
 580     int last = FFMIN(se, *last_nnz);
 581
 582     OPEN_READER(re, &s->gb);
 583     if(*EOBRUN)
 584         (*EOBRUN)--;
 585     else {
 586         for(;;i++) {
 587             UPDATE_CACHE(re, &s->gb);
 588             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 589
 590             if(code & 0xF) {
 591                 run = ((unsigned) code) >> 4;
 592                 UPDATE_CACHE(re, &s->gb);
 593                 val = SHOW_UBITS(re, &s->gb, 1);
 594                 LAST_SKIP_BITS(re, &s->gb, 1);
 595                 ZERO_RUN;
 596                 j = s->scantable.permutated[i];
 597                 val--;
 598                 block[j] = ((quant_matrix[j]^val)-val) << Al;
 599                 if(i == se) {
 600                     if(i > *last_nnz)
 601                         *last_nnz = i;
 602                     CLOSE_READER(re, &s->gb);
 603                     return 0;
 604                 }
 605             }else{
 606                 run = ((unsigned) code) >> 4;
 607                 if(run == 0xF){
 608                     ZERO_RUN;
 609                 }else{
 610                     val = run;
 611                     run = (1 << run);
 612                     if(val) {
 613                         UPDATE_CACHE(re, &s->gb);
 614                         run += SHOW_UBITS(re, &s->gb, val);
 615                         LAST_SKIP_BITS(re, &s->gb, val);
 616                     }
 617                     *EOBRUN = run - 1;
 618                     break;
 619                 }
 620             }
 621         }
 622
 623         if(i > *last_nnz)
 624             *last_nnz = i;
 625     }
 626
 627     for(;i<=last;i++) {
 628         j = s->scantable.permutated[i];
 629         if(block[j])
 630             REFINE_BIT(j)
 631     }
 632     CLOSE_READER(re, &s->gb);
 633
 634     return 0;
 635 }
 636 #undef REFINE_BIT
 637 #undef ZERO_RUN
 638
 639 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
 640     int i, mb_x, mb_y;
 641     uint16_t (*buffer)[4];
 642     int left[3], top[3], topleft[3];
 643     const int linesize= s->linesize[0];
 644     const int mask= (1<<s->bits)-1;
 645
 646     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
 647     buffer= s->ljpeg_buffer;
 648
 649     for(i=0; i<3; i++){
 650         buffer[0][i]= 1 << (s->bits + point_transform - 1);
 651     }
 652     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 653         const int modified_predictor= mb_y ? predictor : 1;
 654         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
 655
 656         if (s->interlaced && s->bottom_field)
 657             ptr += linesize >> 1;
 658
 659         for(i=0; i<3; i++){
 660             top[i]= left[i]= topleft[i]= buffer[0][i];
 661         }
 662         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 663             if (s->restart_interval && !s->restart_count)
 664                 s->restart_count = s->restart_interval;
 665
 666             for(i=0;i<3;i++) {
 667                 int pred;
 668
 669                 topleft[i]= top[i];
 670                 top[i]= buffer[mb_x][i];
 671
 672                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 673
 674                 left[i]=
 675                 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
 676             }
 677
 678             if (s->restart_interval && !--s->restart_count) {
 679                 align_get_bits(&s->gb);
 680                 skip_bits(&s->gb, 16); /* skip RSTn */
 681             }
 682         }
 683
 684         if(s->rct){
 685             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 686                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
 687                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
 688                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
 689             }
 690         }else if(s->pegasus_rct){
 691             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 692                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
 693                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
 694                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
 695             }
 696         }else{
 697             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 698                 ptr[4*mb_x+0] = buffer[mb_x][2];
 699                 ptr[4*mb_x+1] = buffer[mb_x][1];
 700                 ptr[4*mb_x+2] = buffer[mb_x][0];
 701             }
 702         }
 703     }
 704     return 0;
 705 }
 706
 707 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
 708     int i, mb_x, mb_y;
 709     const int nb_components=3;
 710
 711     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 712         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 713             if (s->restart_interval && !s->restart_count)
 714                 s->restart_count = s->restart_interval;
 715
 716             if(mb_x==0 || mb_y==0 || s->interlaced){
 717                 for(i=0;i<nb_components;i++) {
 718                     uint8_t *ptr;
 719                     int n, h, v, x, y, c, j, linesize;
 720                     n = s->nb_blocks[i];
 721                     c = s->comp_index[i];
 722                     h = s->h_scount[i];
 723                     v = s->v_scount[i];
 724                     x = 0;
 725                     y = 0;
 726                     linesize= s->linesize[c];
 727
 728                     for(j=0; j<n; j++) {
 729                         int pred;
 730
 731                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 732                         if(y==0 && mb_y==0){
 733                             if(x==0 && mb_x==0){
 734                                 pred= 128 << point_transform;
 735                             }else{
 736                                 pred= ptr[-1];
 737                             }
 738                         }else{
 739                             if(x==0 && mb_x==0){
 740                                 pred= ptr[-linesize];
 741                             }else{
 742                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 743                             }
 744                         }
 745
 746                         if (s->interlaced && s->bottom_field)
 747                             ptr += linesize >> 1;
 748                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
 749
 750                         if (++x == h) {
 751                             x = 0;
 752                             y++;
 753                         }
 754                     }
 755                 }
 756             }else{
 757                 for(i=0;i<nb_components;i++) {
 758                     uint8_t *ptr;
 759                     int n, h, v, x, y, c, j, linesize;
 760                     n = s->nb_blocks[i];
 761                     c = s->comp_index[i];
 762                     h = s->h_scount[i];
 763                     v = s->v_scount[i];
 764                     x = 0;
 765                     y = 0;
 766                     linesize= s->linesize[c];
 767
 768                     for(j=0; j<n; j++) {
 769                         int pred;
 770
 771                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 772                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 773                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
 774                         if (++x == h) {
 775                             x = 0;
 776                             y++;
 777                         }
 778                     }
 779                 }
 780             }
 781             if (s->restart_interval && !--s->restart_count) {
 782                 align_get_bits(&s->gb);
 783                 skip_bits(&s->gb, 16); /* skip RSTn */
 784             }
 785         }
 786     }
 787     return 0;
 788 }
 789
 790 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
 791                                               int linesize, int lowres)
 792 {
 793     switch (lowres) {
 794     case 0: copy_block8(dst, src, linesize, linesize, 8);
 795         break;
 796     case 1: copy_block4(dst, src, linesize, linesize, 4);
 797         break;
 798     case 2: copy_block2(dst, src, linesize, linesize, 2);
 799         break;
 800     case 3: *dst = *src;
 801         break;
 802     }
 803 }
 804
 805 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,
 806                              const uint8_t *mb_bitmask, const AVFrame *reference){
 807     int i, mb_x, mb_y;
 808     uint8_t* data[MAX_COMPONENTS];
 809     const uint8_t *reference_data[MAX_COMPONENTS];
 810     int linesize[MAX_COMPONENTS];
 811     GetBitContext mb_bitmask_gb;
 812
 813     if (mb_bitmask) {
 814         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
 815     }
 816
 817     if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
 818         av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
 819         s->flipped = 0;
 820     }
 821     for(i=0; i < nb_components; i++) {
 822         int c = s->comp_index[i];
 823         data[c] = s->picture_ptr->data[c];
 824         reference_data[c] = reference ? reference->data[c] : NULL;
 825         linesize[c]=s->linesize[c];
 826         s->coefs_finished[c] |= 1;
 827         if(s->flipped) {
 828             //picture should be flipped upside-down for this codec
 829             int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
 830             data[c] += offset;
 831             reference_data[c] += offset;
 832             linesize[c] *= -1;
 833         }
 834     }
 835
 836     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 837         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 838             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
 839
 840             if (s->restart_interval && !s->restart_count)
 841                 s->restart_count = s->restart_interval;
 842
 843             if(get_bits_count(&s->gb)>s->gb.size_in_bits){
 844                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 845                 return -1;
 846             }
 847             for(i=0;i<nb_components;i++) {
 848                 uint8_t *ptr;
 849                 int n, h, v, x, y, c, j;
 850                 int block_offset;
 851                 n = s->nb_blocks[i];
 852                 c = s->comp_index[i];
 853                 h = s->h_scount[i];
 854                 v = s->v_scount[i];
 855                 x = 0;
 856                 y = 0;
 857                 for(j=0;j<n;j++) {
 858                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
 859                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
 860
 861                     if(s->interlaced && s->bottom_field)
 862                         block_offset += linesize[c] >> 1;
 863                     ptr = data[c] + block_offset;
 864                     if(!s->progressive) {
 865                         if (copy_mb) {
 866                             mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);
 867                         } else {
 868                         s->dsp.clear_block(s->block);
 869                         if(decode_block(s, s->block, i,
 870                                      s->dc_index[i], s->ac_index[i],
 871                                      s->quant_matrixes[ s->quant_index[c] ]) < 0) {
 872                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 873                             return -1;
 874                         }
 875                         s->dsp.idct_put(ptr, linesize[c], s->block);
 876                         }
 877                     } else {
 878                         int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
 879                         DCTELEM *block = s->blocks[c][block_idx];
 880                         if(Ah)
 881                             block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
 882                         else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
 883                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 884                             return -1;
 885                         }
 886                     }
 887 //                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
 888 //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);
 889                     if (++x == h) {
 890                         x = 0;
 891                         y++;
 892                     }
 893                 }
 894             }
 895
 896             if (s->restart_interval) --s->restart_count;
 897             i= 8+((-get_bits_count(&s->gb))&7);
 898             if (s->restart_interval && show_bits(&s->gb, i)  == (1<<i)-1){ /* skip RSTn */
 899                 int pos= get_bits_count(&s->gb);
 900                 align_get_bits(&s->gb);
 901                 while(get_bits_count(&s->gb) < s->gb.size_in_bits && show_bits(&s->gb, 8) == 0xFF)
 902                     skip_bits(&s->gb, 8);
 903                 if(get_bits_count(&s->gb) < s->gb.size_in_bits && (get_bits(&s->gb, 8)&0xF8) == 0xD0){
 904                     for (i=0; i<nb_components; i++) /* reset dc */
 905                         s->last_dc[i] = 1024;
 906                 }else{
 907                     skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
 908                 }
 909             }
 910         }
 911     }
 912     return 0;
 913 }
 914
 915 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
 916     int mb_x, mb_y;
 917     int EOBRUN = 0;
 918     int c = s->comp_index[0];
 919     uint8_t* data = s->picture.data[c];
 920     int linesize = s->linesize[c];
 921     int last_scan = 0;
 922     int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
 923
 924     if(!Al) {
 925         s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
 926         last_scan = !~s->coefs_finished[c];
 927     }
 928
 929     if(s->interlaced && s->bottom_field)
 930         data += linesize >> 1;
 931
 932     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 933         uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
 934         int block_idx = mb_y * s->block_stride[c];
 935         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
 936         uint8_t *last_nnz = &s->last_nnz[c][block_idx];
 937         for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
 938             int ret;
 939             if(Ah)
 940                 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
 941                                               quant_matrix, ss, se, Al, &EOBRUN);
 942             else
 943                 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
 944                                                quant_matrix, ss, se, Al, &EOBRUN);
 945             if(ret < 0) {
 946                 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 947                 return -1;
 948             }
 949             if(last_scan) {
 950                 s->dsp.idct_put(ptr, linesize, *block);
 951                 ptr += 8 >> s->avctx->lowres;
 952             }
 953         }
 954     }
 955     return 0;
 956 }
 957
 958 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
 959                         const uint8_t *mb_bitmask, const AVFrame *reference)
 960 {
 961     int len, nb_components, i, h, v, predictor, point_transform;
 962     int index, id;
 963     const int block_size= s->lossless ? 1 : 8;
 964     int ilv, prev_shift;
 965
 966     /* XXX: verify len field validity */
 967     len = get_bits(&s->gb, 16);
 968     nb_components = get_bits(&s->gb, 8);
 969     if (nb_components == 0 || nb_components > MAX_COMPONENTS){
 970         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
 971         return -1;
 972     }
 973     if (len != 6+2*nb_components)
 974     {
 975         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
 976         return -1;
 977     }
 978     for(i=0;i<nb_components;i++) {
 979         id = get_bits(&s->gb, 8) - 1;
 980         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
 981         /* find component index */
 982         for(index=0;index<s->nb_components;index++)
 983             if (id == s->component_id[index])
 984                 break;
 985         if (index == s->nb_components)
 986         {
 987             av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
 988             return -1;
 989         }
 990         /* Metasoft MJPEG codec has Cb and Cr swapped */
 991         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
 992             && nb_components == 3 && s->nb_components == 3 && i)
 993             index = 3 - i;
 994
 995         s->comp_index[i] = index;
 996
 997         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
 998         s->h_scount[i] = s->h_count[index];
 999         s->v_scount[i] = s->v_count[index];
1000
1001         s->dc_index[i] = get_bits(&s->gb, 4);
1002         s->ac_index[i] = get_bits(&s->gb, 4);
1003
1004         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
1005             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1006             goto out_of_range;
1007         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
1008             goto out_of_range;
1009     }
1010
1011     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1012     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
1013     if(s->avctx->codec_tag != AV_RL32("CJPG")){
1014         prev_shift = get_bits(&s->gb, 4); /* Ah */
1015         point_transform= get_bits(&s->gb, 4); /* Al */
1016     }else
1017         prev_shift= point_transform= 0;
1018
1019     for(i=0;i<nb_components;i++)
1020         s->last_dc[i] = 1024;
1021
1022     if (nb_components > 1) {
1023         /* interleaved stream */
1024         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
1025         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1026     } else if(!s->ls) { /* skip this for JPEG-LS */
1027         h = s->h_max / s->h_scount[0];
1028         v = s->v_max / s->v_scount[0];
1029         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
1030         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1031         s->nb_blocks[0] = 1;
1032         s->h_scount[0] = 1;
1033         s->v_scount[0] = 1;
1034     }
1035
1036     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1037         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" : "",
1038                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1039                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1040
1041
1042     /* mjpeg-b can have padding bytes between sos and image data, skip them */
1043     for (i = s->mjpb_skiptosod; i > 0; i--)
1044         skip_bits(&s->gb, 8);
1045
1046     if(s->lossless){
1047         av_assert0(s->picture_ptr == &s->picture);
1048         if(CONFIG_JPEGLS_DECODER && s->ls){
1049 //            for(){
1050 //            reset_ls_coding_parameters(s, 0);
1051
1052             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1053                 return -1;
1054         }else{
1055             if(s->rgb){
1056                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1057                     return -1;
1058             }else{
1059                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1060                     return -1;
1061             }
1062         }
1063     }else{
1064         if(s->progressive && predictor) {
1065             av_assert0(s->picture_ptr == &s->picture);
1066             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
1067                 return -1;
1068         } else {
1069             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1070                                  mb_bitmask, reference) < 0)
1071                 return -1;
1072         }
1073     }
1074     emms_c();
1075     return 0;
1076  out_of_range:
1077     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1078     return -1;
1079 }
1080
1081 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1082 {
1083     if (get_bits(&s->gb, 16) != 4)
1084         return -1;
1085     s->restart_interval = get_bits(&s->gb, 16);
1086     s->restart_count = 0;
1087     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1088
1089     return 0;
1090 }
1091
1092 static int mjpeg_decode_app(MJpegDecodeContext *s)
1093 {
1094     int len, id, i;
1095
1096     len = get_bits(&s->gb, 16);
1097     if (len < 5)
1098         return -1;
1099     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1100         return -1;
1101
1102     id = get_bits_long(&s->gb, 32);
1103     id = av_be2ne32(id);
1104     len -= 6;
1105
1106     if(s->avctx->debug & FF_DEBUG_STARTCODE){
1107         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1108     }
1109
1110     /* buggy AVID, it puts EOI only at every 10th frame */
1111     /* also this fourcc is used by non-avid files too, it holds some
1112        informations, but it's always present in AVID creates files */
1113     if (id == AV_RL32("AVI1"))
1114     {
1115         /* structure:
1116             4bytes      AVI1
1117             1bytes      polarity
1118             1bytes      always zero
1119             4bytes      field_size
1120             4bytes      field_size_less_padding
1121         */
1122             s->buggy_avid = 1;
1123 //        if (s->first_picture)
1124 //            printf("mjpeg: workarounding buggy AVID\n");
1125         i = get_bits(&s->gb, 8); len--;
1126         av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1127 #if 0
1128         skip_bits(&s->gb, 8);
1129         skip_bits(&s->gb, 32);
1130         skip_bits(&s->gb, 32);
1131         len -= 10;
1132 #endif
1133 //        if (s->interlace_polarity)
1134 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1135         goto out;
1136     }
1137
1138 //    len -= 2;
1139
1140     if (id == AV_RL32("JFIF"))
1141     {
1142         int t_w, t_h, v1, v2;
1143         skip_bits(&s->gb, 8); /* the trailing zero-byte */
1144         v1= get_bits(&s->gb, 8);
1145         v2= get_bits(&s->gb, 8);
1146         skip_bits(&s->gb, 8);
1147
1148         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1149         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1150
1151         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1152             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1153                 v1, v2,
1154                 s->avctx->sample_aspect_ratio.num,
1155                 s->avctx->sample_aspect_ratio.den
1156             );
1157
1158         t_w = get_bits(&s->gb, 8);
1159         t_h = get_bits(&s->gb, 8);
1160         if (t_w && t_h)
1161         {
1162             /* skip thumbnail */
1163             if (len-10-(t_w*t_h*3) > 0)
1164                 len -= t_w*t_h*3;
1165         }
1166         len -= 10;
1167         goto out;
1168     }
1169
1170     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1171     {
1172         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1173             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1174         skip_bits(&s->gb, 16); /* version */
1175         skip_bits(&s->gb, 16); /* flags0 */
1176         skip_bits(&s->gb, 16); /* flags1 */
1177         skip_bits(&s->gb, 8);  /* transform */
1178         len -= 7;
1179         goto out;
1180     }
1181
1182     if (id == AV_RL32("LJIF")){
1183         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1184             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1185         skip_bits(&s->gb, 16); /* version ? */
1186         skip_bits(&s->gb, 16); /* unknwon always 0? */
1187         skip_bits(&s->gb, 16); /* unknwon always 0? */
1188         skip_bits(&s->gb, 16); /* unknwon always 0? */
1189         switch( get_bits(&s->gb, 8)){
1190         case 1:
1191             s->rgb= 1;
1192             s->pegasus_rct=0;
1193             break;
1194         case 2:
1195             s->rgb= 1;
1196             s->pegasus_rct=1;
1197             break;
1198         default:
1199             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1200         }
1201         len -= 9;
1202         goto out;
1203     }
1204
1205     /* Apple MJPEG-A */
1206     if ((s->start_code == APP1) && (len > (0x28 - 8)))
1207     {
1208         id = get_bits_long(&s->gb, 32);
1209         id = av_be2ne32(id);
1210         len -= 4;
1211         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1212         {
1213 #if 0
1214             skip_bits(&s->gb, 32); /* field size */
1215             skip_bits(&s->gb, 32); /* pad field size */
1216             skip_bits(&s->gb, 32); /* next off */
1217             skip_bits(&s->gb, 32); /* quant off */
1218             skip_bits(&s->gb, 32); /* huff off */
1219             skip_bits(&s->gb, 32); /* image off */
1220             skip_bits(&s->gb, 32); /* scan off */
1221             skip_bits(&s->gb, 32); /* data off */
1222 #endif
1223             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1224                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1225         }
1226     }
1227
1228 out:
1229     /* slow but needed for extreme adobe jpegs */
1230     if (len < 0)
1231         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1232     while(--len > 0)
1233         skip_bits(&s->gb, 8);
1234
1235     return 0;
1236 }
1237
1238 static int mjpeg_decode_com(MJpegDecodeContext *s)
1239 {
1240     int len = get_bits(&s->gb, 16);
1241     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1242         char *cbuf = av_malloc(len - 1);
1243         if (cbuf) {
1244             int i;
1245             for (i = 0; i < len - 2; i++)
1246                 cbuf[i] = get_bits(&s->gb, 8);
1247             if (i > 0 && cbuf[i-1] == '\n')
1248                 cbuf[i-1] = 0;
1249             else
1250                 cbuf[i] = 0;
1251
1252             if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1253                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1254
1255             /* buggy avid, it puts EOI only at every 10th frame */
1256             if (!strcmp(cbuf, "AVID"))
1257             {
1258                 s->buggy_avid = 1;
1259                 //        if (s->first_picture)
1260                 //            printf("mjpeg: workarounding buggy AVID\n");
1261             }
1262             else if(!strcmp(cbuf, "CS=ITU601")){
1263                 s->cs_itu601= 1;
1264             }
1265             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1266                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
1267                 s->flipped = 1;
1268             }
1269
1270             av_free(cbuf);
1271         }
1272     }
1273
1274     return 0;
1275 }
1276
1277 /* return the 8 bit start code value and update the search
1278    state. Return -1 if no start code found */
1279 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1280 {
1281     const uint8_t *buf_ptr;
1282     unsigned int v, v2;
1283     int val;
1284     int skipped=0;
1285
1286     buf_ptr = *pbuf_ptr;
1287     while (buf_ptr < buf_end) {
1288         v = *buf_ptr++;
1289         v2 = *buf_ptr;
1290         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1291             val = *buf_ptr++;
1292             goto found;
1293         }
1294         skipped++;
1295     }
1296     val = -1;
1297 found:
1298     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1299     *pbuf_ptr = buf_ptr;
1300     return val;
1301 }
1302
1303 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1304                          const uint8_t **buf_ptr, const uint8_t *buf_end,
1305                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
1306 {
1307     int start_code;
1308     start_code = find_marker(buf_ptr, buf_end);
1309
1310                 if ((buf_end - *buf_ptr) > s->buffer_size)
1311                 {
1312                     av_free(s->buffer);
1313                     s->buffer_size = buf_end - *buf_ptr;
1314                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1315                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1316                         s->buffer_size);
1317                 }
1318
1319                 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1320                 if (start_code == SOS && !s->ls)
1321                 {
1322                     const uint8_t *src = *buf_ptr;
1323                     uint8_t *dst = s->buffer;
1324
1325                     while (src<buf_end)
1326                     {
1327                         uint8_t x = *(src++);
1328
1329                         *(dst++) = x;
1330                         if (s->avctx->codec_id != CODEC_ID_THP)
1331                         {
1332                             if (x == 0xff) {
1333                                 while (src < buf_end && x == 0xff)
1334                                     x = *(src++);
1335
1336                                 if (x >= 0xd0 && x <= 0xd7)
1337                                     *(dst++) = x;
1338                                 else if (x)
1339                                     break;
1340                             }
1341                         }
1342                     }
1343                     *unescaped_buf_ptr  = s->buffer;
1344                     *unescaped_buf_size = dst - s->buffer;
1345
1346                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1347                            (buf_end - *buf_ptr) - (dst - s->buffer));
1348                 }
1349                 else if(start_code == SOS && s->ls){
1350                     const uint8_t *src = *buf_ptr;
1351                     uint8_t *dst = s->buffer;
1352                     int bit_count = 0;
1353                     int t = 0, b = 0;
1354                     PutBitContext pb;
1355
1356                     s->cur_scan++;
1357
1358                     /* find marker */
1359                     while (src + t < buf_end){
1360                         uint8_t x = src[t++];
1361                         if (x == 0xff){
1362                             while((src + t < buf_end) && x == 0xff)
1363                                 x = src[t++];
1364                             if (x & 0x80) {
1365                                 t -= 2;
1366                                 break;
1367                             }
1368                         }
1369                     }
1370                     bit_count = t * 8;
1371
1372                     init_put_bits(&pb, dst, t);
1373
1374                     /* unescape bitstream */
1375                     while(b < t){
1376                         uint8_t x = src[b++];
1377                         put_bits(&pb, 8, x);
1378                         if(x == 0xFF){
1379                             x = src[b++];
1380                             put_bits(&pb, 7, x);
1381                             bit_count--;
1382                         }
1383                     }
1384                     flush_put_bits(&pb);
1385
1386                     *unescaped_buf_ptr  = dst;
1387                     *unescaped_buf_size = (bit_count + 7) >> 3;
1388                 }
1389                 else
1390                 {
1391                     *unescaped_buf_ptr  = *buf_ptr;
1392                     *unescaped_buf_size = buf_end - *buf_ptr;
1393                 }
1394
1395     return start_code;
1396 }
1397
1398 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1399                               void *data, int *data_size,
1400                               AVPacket *avpkt)
1401 {
1402     const uint8_t *buf = avpkt->data;
1403     int buf_size = avpkt->size;
1404     MJpegDecodeContext *s = avctx->priv_data;
1405     const uint8_t *buf_end, *buf_ptr;
1406     const uint8_t *unescaped_buf_ptr;
1407     int unescaped_buf_size;
1408     int start_code;
1409     AVFrame *picture = data;
1410
1411     s->got_picture = 0; // picture from previous image can not be reused
1412     buf_ptr = buf;
1413     buf_end = buf + buf_size;
1414     while (buf_ptr < buf_end) {
1415         /* find start next marker */
1416         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1417                                           &unescaped_buf_ptr, &unescaped_buf_size);
1418         {
1419             /* EOF */
1420             if (start_code < 0) {
1421                 goto the_end;
1422             } else {
1423                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1424
1425                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
1426
1427                 s->start_code = start_code;
1428                 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1429                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1430                 }
1431
1432                 /* process markers */
1433                 if (start_code >= 0xd0 && start_code <= 0xd7) {
1434                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1435                     /* APP fields */
1436                 } else if (start_code >= APP0 && start_code <= APP15) {
1437                     mjpeg_decode_app(s);
1438                     /* Comment */
1439                 } else if (start_code == COM){
1440                     mjpeg_decode_com(s);
1441                 }
1442
1443                 switch(start_code) {
1444                 case SOI:
1445                     s->restart_interval = 0;
1446
1447                     s->restart_count = 0;
1448                     /* nothing to do on SOI */
1449                     break;
1450                 case DQT:
1451                     ff_mjpeg_decode_dqt(s);
1452                     break;
1453                 case DHT:
1454                     if(ff_mjpeg_decode_dht(s) < 0){
1455                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1456                         return -1;
1457                     }
1458                     break;
1459                 case SOF0:
1460                 case SOF1:
1461                     s->lossless=0;
1462                     s->ls=0;
1463                     s->progressive=0;
1464                     if (ff_mjpeg_decode_sof(s) < 0)
1465                         return -1;
1466                     break;
1467                 case SOF2:
1468                     s->lossless=0;
1469                     s->ls=0;
1470                     s->progressive=1;
1471                     if (ff_mjpeg_decode_sof(s) < 0)
1472                         return -1;
1473                     break;
1474                 case SOF3:
1475                     s->lossless=1;
1476                     s->ls=0;
1477                     s->progressive=0;
1478                     if (ff_mjpeg_decode_sof(s) < 0)
1479                         return -1;
1480                     break;
1481                 case SOF48:
1482                     s->lossless=1;
1483                     s->ls=1;
1484                     s->progressive=0;
1485                     if (ff_mjpeg_decode_sof(s) < 0)
1486                         return -1;
1487                     break;
1488                 case LSE:
1489                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1490                         return -1;
1491                     break;
1492                 case EOI:
1493 eoi_parser:
1494                     s->cur_scan = 0;
1495                     if (!s->got_picture) {
1496                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1497                         break;
1498                     }
1499                     if (s->interlaced) {
1500                         s->bottom_field ^= 1;
1501                         /* if not bottom field, do not output image yet */
1502                         if (s->bottom_field == !s->interlace_polarity)
1503                             break;
1504                     }
1505                     *picture = *s->picture_ptr;
1506                     *data_size = sizeof(AVFrame);
1507
1508                     if(!s->lossless){
1509                         picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1510                         picture->qstride= 0;
1511                         picture->qscale_table= s->qscale_table;
1512                         memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1513                         if(avctx->debug & FF_DEBUG_QP)
1514                             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1515                         picture->quality*= FF_QP2LAMBDA;
1516                     }
1517
1518                     goto the_end;
1519                 case SOS:
1520                     if (!s->got_picture) {
1521                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1522                         break;
1523                     }
1524                     if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1525                         (avctx->err_recognition & AV_EF_EXPLODE))
1526                       return AVERROR_INVALIDDATA;
1527                     break;
1528                 case DRI:
1529                     mjpeg_decode_dri(s);
1530                     break;
1531                 case SOF5:
1532                 case SOF6:
1533                 case SOF7:
1534                 case SOF9:
1535                 case SOF10:
1536                 case SOF11:
1537                 case SOF13:
1538                 case SOF14:
1539                 case SOF15:
1540                 case JPG:
1541                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1542                     break;
1543 //                default:
1544 //                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1545 //                    break;
1546                 }
1547
1548                 /* eof process start code */
1549                 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1550                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1551                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1552             }
1553         }
1554     }
1555     if (s->got_picture) {
1556         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1557         goto eoi_parser;
1558     }
1559     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1560     return -1;
1561 the_end:
1562     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1563 //    return buf_end - buf_ptr;
1564     return buf_ptr - buf;
1565 }
1566
1567 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1568 {
1569     MJpegDecodeContext *s = avctx->priv_data;
1570     int i, j;
1571
1572     if (s->picture_ptr && s->picture_ptr->data[0])
1573         avctx->release_buffer(avctx, s->picture_ptr);
1574
1575     av_free(s->buffer);
1576     av_free(s->qscale_table);
1577     av_freep(&s->ljpeg_buffer);
1578     s->ljpeg_buffer_size=0;
1579
1580     for(i=0;i<3;i++) {
1581         for(j=0;j<4;j++)
1582             free_vlc(&s->vlcs[i][j]);
1583     }
1584     for(i=0; i<MAX_COMPONENTS; i++) {
1585         av_freep(&s->blocks[i]);
1586         av_freep(&s->last_nnz[i]);
1587     }
1588     return 0;
1589 }
1590
1591 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1592 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1593 static const AVOption options[] = {
1594     { "extern_huff",        "Use external huffman table.",  OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1595     { NULL },
1596 };
1597
1598 static const AVClass mjpegdec_class = {
1599     .class_name = "MJPEG decoder",
1600     .item_name  = av_default_item_name,
1601     .option     = options,
1602     .version    = LIBAVUTIL_VERSION_INT,
1603 };
1604
1605 AVCodec ff_mjpeg_decoder = {
1606     .name           = "mjpeg",
1607     .type           = AVMEDIA_TYPE_VIDEO,
1608     .id             = CODEC_ID_MJPEG,
1609     .priv_data_size = sizeof(MJpegDecodeContext),
1610     .init           = ff_mjpeg_decode_init,
1611     .close          = ff_mjpeg_decode_end,
1612     .decode         = ff_mjpeg_decode_frame,
1613     .capabilities   = CODEC_CAP_DR1,
1614     .max_lowres = 3,
1615     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1616     .priv_class     = &mjpegdec_class,
1617 };
1618
1619 AVCodec ff_thp_decoder = {
1620     .name           = "thp",
1621     .type           = AVMEDIA_TYPE_VIDEO,
1622     .id             = CODEC_ID_THP,
1623     .priv_data_size = sizeof(MJpegDecodeContext),
1624     .init           = ff_mjpeg_decode_init,
1625     .close          = ff_mjpeg_decode_end,
1626     .decode         = ff_mjpeg_decode_frame,
1627     .capabilities   = CODEC_CAP_DR1,
1628     .max_lowres = 3,
1629     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1630 };