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->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
 116         s->interlace_polarity = 1; /* bottom field first */
 117         av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
 118     }
 119     if (avctx->codec->id == CODEC_ID_AMV)
 120         s->flipped = 1;
 121
 122     return 0;
 123 }
 124
 125
 126 /* quantize tables */
 127 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
 128 {
 129     int len, index, i, j;
 130
 131     len = get_bits(&s->gb, 16) - 2;
 132
 133     while (len >= 65) {
 134         /* only 8 bit precision handled */
 135         if (get_bits(&s->gb, 4) != 0)
 136         {
 137             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
 138             return -1;
 139         }
 140         index = get_bits(&s->gb, 4);
 141         if (index >= 4)
 142             return -1;
 143         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
 144         /* read quant table */
 145         for(i=0;i<64;i++) {
 146             j = s->scantable.permutated[i];
 147             s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
 148         }
 149
 150         //XXX FIXME finetune, and perhaps add dc too
 151         s->qscale[index]= FFMAX(
 152             s->quant_matrixes[index][s->scantable.permutated[1]],
 153             s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
 154         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
 155         len -= 65;
 156     }
 157
 158     return 0;
 159 }
 160
 161 /* decode huffman tables and build VLC decoders */
 162 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
 163 {
 164     int len, index, i, class, n, v, code_max;
 165     uint8_t bits_table[17];
 166     uint8_t val_table[256];
 167
 168     len = get_bits(&s->gb, 16) - 2;
 169
 170     while (len > 0) {
 171         if (len < 17)
 172             return -1;
 173         class = get_bits(&s->gb, 4);
 174         if (class >= 2)
 175             return -1;
 176         index = get_bits(&s->gb, 4);
 177         if (index >= 4)
 178             return -1;
 179         n = 0;
 180         for(i=1;i<=16;i++) {
 181             bits_table[i] = get_bits(&s->gb, 8);
 182             n += bits_table[i];
 183         }
 184         len -= 17;
 185         if (len < n || n > 256)
 186             return -1;
 187
 188         code_max = 0;
 189         for(i=0;i<n;i++) {
 190             v = get_bits(&s->gb, 8);
 191             if (v > code_max)
 192                 code_max = v;
 193             val_table[i] = v;
 194         }
 195         len -= n;
 196
 197         /* build VLC and flush previous vlc if present */
 198         free_vlc(&s->vlcs[class][index]);
 199         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
 200                class, index, code_max + 1);
 201         if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
 202             return -1;
 203         }
 204
 205         if(class>0){
 206             free_vlc(&s->vlcs[2][index]);
 207             if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){
 208             return -1;
 209             }
 210         }
 211     }
 212     return 0;
 213 }
 214
 215 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
 216 {
 217     int len, nb_components, i, width, height, pix_fmt_id;
 218
 219     s->cur_scan = 0;
 220
 221     /* XXX: verify len field validity */
 222     len = get_bits(&s->gb, 16);
 223     s->bits= get_bits(&s->gb, 8);
 224
 225     if(s->pegasus_rct) s->bits=9;
 226     if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
 227
 228     if (s->bits != 8 && !s->lossless){
 229         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
 230         return -1;
 231     }
 232
 233     if(s->lossless && s->avctx->lowres){
 234         av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
 235         return -1;
 236     }
 237
 238     height = get_bits(&s->gb, 16);
 239     width = get_bits(&s->gb, 16);
 240
 241     //HACK for odd_height.mov
 242     if(s->interlaced && s->width == width && s->height == height + 1)
 243         height= s->height;
 244
 245     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
 246     if(av_image_check_size(width, height, 0, s->avctx))
 247         return -1;
 248
 249     nb_components = get_bits(&s->gb, 8);
 250     if (nb_components <= 0 ||
 251         nb_components > MAX_COMPONENTS)
 252         return -1;
 253     if (s->ls && !(s->bits <= 8 || nb_components == 1)){
 254         av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
 255         return -1;
 256     }
 257     s->nb_components = nb_components;
 258     s->h_max = 1;
 259     s->v_max = 1;
 260     for(i=0;i<nb_components;i++) {
 261         /* component id */
 262         s->component_id[i] = get_bits(&s->gb, 8) - 1;
 263         s->h_count[i] = get_bits(&s->gb, 4);
 264         s->v_count[i] = get_bits(&s->gb, 4);
 265         /* compute hmax and vmax (only used in interleaved case) */
 266         if (s->h_count[i] > s->h_max)
 267             s->h_max = s->h_count[i];
 268         if (s->v_count[i] > s->v_max)
 269             s->v_max = s->v_count[i];
 270         s->quant_index[i] = get_bits(&s->gb, 8);
 271         if (s->quant_index[i] >= 4)
 272             return -1;
 273         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
 274                s->v_count[i], s->component_id[i], s->quant_index[i]);
 275     }
 276
 277     if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
 278         av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
 279         return -1;
 280     }
 281
 282     if(s->v_max==1 && s->h_max==1 && s->lossless==1 && nb_components==3) s->rgb=1;
 283
 284     /* if different size, realloc/alloc picture */
 285     /* XXX: also check h_count and v_count */
 286     if (width != s->width || height != s->height) {
 287         av_freep(&s->qscale_table);
 288
 289         s->width = width;
 290         s->height = height;
 291         s->interlaced = 0;
 292
 293         /* test interlaced mode */
 294         if (s->first_picture &&
 295             s->org_height != 0 &&
 296             s->height < ((s->org_height * 3) / 4)) {
 297             s->interlaced = 1;
 298             s->bottom_field = s->interlace_polarity;
 299             s->picture_ptr->interlaced_frame = 1;
 300             s->picture_ptr->top_field_first = !s->interlace_polarity;
 301             height *= 2;
 302         }
 303
 304         avcodec_set_dimensions(s->avctx, width, height);
 305
 306         s->qscale_table= av_mallocz((s->width+15)/16);
 307
 308         s->first_picture = 0;
 309     }
 310
 311     if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
 312         return 0;
 313
 314     /* XXX: not complete test ! */
 315     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
 316                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
 317                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
 318                  (s->h_count[3] <<  4) |  s->v_count[3];
 319     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
 320     //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
 321     if(!(pix_fmt_id & 0xD0D0D0D0))
 322         pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
 323     if(!(pix_fmt_id & 0x0D0D0D0D))
 324         pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
 325
 326     switch(pix_fmt_id){
 327     case 0x11111100:
 328         if(s->rgb){
 329             s->avctx->pix_fmt = PIX_FMT_BGR24;
 330         }else{
 331             if(s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A'){
 332                 s->avctx->pix_fmt = PIX_FMT_GBR24P;
 333             }else{
 334             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
 335             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 336             }
 337         }
 338         assert(s->nb_components==3);
 339         break;
 340     case 0x12121100:
 341         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
 342         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 343         s->yuv442 = 1;
 344         break;
 345     case 0x11000000:
 346         if(s->bits <= 8)
 347             s->avctx->pix_fmt = PIX_FMT_GRAY8;
 348         else
 349             s->avctx->pix_fmt = PIX_FMT_GRAY16;
 350         break;
 351     case 0x12111100:
 352     case 0x22211100:
 353         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
 354         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 355         s->yuv421 = pix_fmt_id == 0x22211100;
 356         break;
 357     case 0x21111100:
 358         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
 359         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 360         break;
 361     case 0x22111100:
 362         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
 363         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
 364         break;
 365     default:
 366         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
 367         return -1;
 368     }
 369     if(s->ls){
 370         if(s->nb_components > 1)
 371             s->avctx->pix_fmt = PIX_FMT_RGB24;
 372         else if(s->bits <= 8)
 373             s->avctx->pix_fmt = PIX_FMT_GRAY8;
 374         else
 375             s->avctx->pix_fmt = PIX_FMT_GRAY16;
 376     }
 377
 378     if(s->picture_ptr->data[0])
 379         s->avctx->release_buffer(s->avctx, s->picture_ptr);
 380
 381     if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){
 382         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 383         return -1;
 384     }
 385     s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;
 386     s->picture_ptr->key_frame= 1;
 387     s->got_picture = 1;
 388
 389     for(i=0; i<3; i++){
 390         s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;
 391     }
 392
 393 //    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
 394
 395     if (len != (8+(3*nb_components)))
 396     {
 397         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
 398     }
 399
 400     /* totally blank picture as progressive JPEG will only add details to it */
 401     if(s->progressive){
 402         int bw = (width  + s->h_max*8-1) / (s->h_max*8);
 403         int bh = (height + s->v_max*8-1) / (s->v_max*8);
 404         for(i=0; i<s->nb_components; i++) {
 405             int size = bw * bh * s->h_count[i] * s->v_count[i];
 406             av_freep(&s->blocks[i]);
 407             av_freep(&s->last_nnz[i]);
 408             s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
 409             s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
 410             s->block_stride[i] = bw * s->h_count[i];
 411         }
 412         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
 413     }
 414     return 0;
 415 }
 416
 417 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
 418 {
 419     int code;
 420     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
 421     if (code < 0)
 422     {
 423         av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
 424                &s->vlcs[0][dc_index]);
 425         return 0xffff;
 426     }
 427
 428     if(code)
 429         return get_xbits(&s->gb, code);
 430     else
 431         return 0;
 432 }
 433
 434 /* decode block and dequantize */
 435 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
 436                         int component, int dc_index, int ac_index, int16_t *quant_matrix)
 437 {
 438     int code, i, j, level, val;
 439
 440     /* DC coef */
 441     val = mjpeg_decode_dc(s, dc_index);
 442     if (val == 0xffff) {
 443         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 444         return -1;
 445     }
 446     val = val * quant_matrix[0] + s->last_dc[component];
 447     s->last_dc[component] = val;
 448     block[0] = val;
 449     /* AC coefs */
 450     i = 0;
 451     {OPEN_READER(re, &s->gb);
 452     do {
 453         UPDATE_CACHE(re, &s->gb);
 454         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
 455
 456         i += ((unsigned)code) >> 4;
 457             code &= 0xf;
 458         if(code){
 459             if(code > MIN_CACHE_BITS - 16){
 460                 UPDATE_CACHE(re, &s->gb);
 461             }
 462             {
 463                 int cache=GET_CACHE(re,&s->gb);
 464                 int sign=(~cache)>>31;
 465                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 466             }
 467
 468             LAST_SKIP_BITS(re, &s->gb, code);
 469
 470             if (i > 63) {
 471                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 472                 return -1;
 473             }
 474             j = s->scantable.permutated[i];
 475             block[j] = level * quant_matrix[j];
 476         }
 477     }while(i<63);
 478     CLOSE_READER(re, &s->gb);}
 479
 480     return 0;
 481 }
 482
 483 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
 484                                  int dc_index, int16_t *quant_matrix, int Al)
 485 {
 486     int val;
 487     s->dsp.clear_block(block);
 488     val = mjpeg_decode_dc(s, dc_index);
 489     if (val == 0xffff) {
 490         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
 491         return -1;
 492     }
 493     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
 494     s->last_dc[component] = val;
 495     block[0] = val;
 496     return 0;
 497 }
 498
 499 /* decode block and dequantize - progressive JPEG version */
 500 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 501                                     int ac_index, int16_t *quant_matrix,
 502                                     int ss, int se, int Al, int *EOBRUN)
 503 {
 504     int code, i, j, level, val, run;
 505
 506     if(*EOBRUN){
 507         (*EOBRUN)--;
 508         return 0;
 509     }
 510     {OPEN_READER(re, &s->gb);
 511     for(i=ss;;i++) {
 512         UPDATE_CACHE(re, &s->gb);
 513         GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 514
 515         run = ((unsigned) code) >> 4;
 516         code &= 0xF;
 517         if(code) {
 518             i += run;
 519             if(code > MIN_CACHE_BITS - 16){
 520                 UPDATE_CACHE(re, &s->gb);
 521             }
 522             {
 523                 int cache=GET_CACHE(re,&s->gb);
 524                 int sign=(~cache)>>31;
 525                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
 526             }
 527
 528             LAST_SKIP_BITS(re, &s->gb, code);
 529
 530             if (i >= se) {
 531                 if(i == se){
 532                     j = s->scantable.permutated[se];
 533                     block[j] = level * quant_matrix[j] << Al;
 534                     break;
 535                 }
 536                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
 537                 return -1;
 538             }
 539             j = s->scantable.permutated[i];
 540             block[j] = level * quant_matrix[j] << Al;
 541         }else{
 542             if(run == 0xF){// ZRL - skip 15 coefficients
 543                 i += 15;
 544                 if (i >= se) {
 545                     av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
 546                     return -1;
 547                 }
 548             }else{
 549                 val = (1 << run);
 550                 if(run){
 551                     UPDATE_CACHE(re, &s->gb);
 552                     val += NEG_USR32(GET_CACHE(re, &s->gb), run);
 553                     LAST_SKIP_BITS(re, &s->gb, run);
 554                 }
 555                 *EOBRUN = val - 1;
 556                 break;
 557             }
 558         }
 559     }
 560     CLOSE_READER(re, &s->gb);}
 561     if(i > *last_nnz)
 562         *last_nnz = i;
 563     return 0;
 564 }
 565
 566 #define REFINE_BIT(j) {\
 567     UPDATE_CACHE(re, &s->gb);\
 568     sign = block[j]>>15;\
 569     block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
 570     LAST_SKIP_BITS(re, &s->gb, 1);\
 571 }
 572
 573 #define ZERO_RUN \
 574 for(;;i++) {\
 575     if(i > last) {\
 576         i += run;\
 577         if(i > se) {\
 578             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
 579             return -1;\
 580         }\
 581         break;\
 582     }\
 583     j = s->scantable.permutated[i];\
 584     if(block[j])\
 585         REFINE_BIT(j)\
 586     else if(run-- == 0)\
 587         break;\
 588 }
 589
 590 /* decode block and dequantize - progressive JPEG refinement pass */
 591 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
 592                         int ac_index, int16_t *quant_matrix,
 593                         int ss, int se, int Al, int *EOBRUN)
 594 {
 595     int code, i=ss, j, sign, val, run;
 596     int last = FFMIN(se, *last_nnz);
 597
 598     OPEN_READER(re, &s->gb);
 599     if(*EOBRUN)
 600         (*EOBRUN)--;
 601     else {
 602         for(;;i++) {
 603             UPDATE_CACHE(re, &s->gb);
 604             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
 605
 606             if(code & 0xF) {
 607                 run = ((unsigned) code) >> 4;
 608                 UPDATE_CACHE(re, &s->gb);
 609                 val = SHOW_UBITS(re, &s->gb, 1);
 610                 LAST_SKIP_BITS(re, &s->gb, 1);
 611                 ZERO_RUN;
 612                 j = s->scantable.permutated[i];
 613                 val--;
 614                 block[j] = ((quant_matrix[j]^val)-val) << Al;
 615                 if(i == se) {
 616                     if(i > *last_nnz)
 617                         *last_nnz = i;
 618                     CLOSE_READER(re, &s->gb);
 619                     return 0;
 620                 }
 621             }else{
 622                 run = ((unsigned) code) >> 4;
 623                 if(run == 0xF){
 624                     ZERO_RUN;
 625                 }else{
 626                     val = run;
 627                     run = (1 << run);
 628                     if(val) {
 629                         UPDATE_CACHE(re, &s->gb);
 630                         run += SHOW_UBITS(re, &s->gb, val);
 631                         LAST_SKIP_BITS(re, &s->gb, val);
 632                     }
 633                     *EOBRUN = run - 1;
 634                     break;
 635                 }
 636             }
 637         }
 638
 639         if(i > *last_nnz)
 640             *last_nnz = i;
 641     }
 642
 643     for(;i<=last;i++) {
 644         j = s->scantable.permutated[i];
 645         if(block[j])
 646             REFINE_BIT(j)
 647     }
 648     CLOSE_READER(re, &s->gb);
 649
 650     return 0;
 651 }
 652 #undef REFINE_BIT
 653 #undef ZERO_RUN
 654
 655 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform){
 656     int i, mb_x, mb_y;
 657     uint16_t (*buffer)[4];
 658     int left[3], top[3], topleft[3];
 659     const int linesize= s->linesize[0];
 660     const int mask= (1<<s->bits)-1;
 661
 662     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
 663     buffer= s->ljpeg_buffer;
 664
 665     for(i=0; i<3; i++){
 666         buffer[0][i]= 1 << (s->bits - 1);
 667     }
 668     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 669         const int modified_predictor= mb_y ? predictor : 1;
 670         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
 671
 672         if (s->interlaced && s->bottom_field)
 673             ptr += linesize >> 1;
 674
 675         for(i=0; i<3; i++){
 676             top[i]= left[i]= topleft[i]= buffer[0][i];
 677         }
 678         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 679             if (s->restart_interval && !s->restart_count)
 680                 s->restart_count = s->restart_interval;
 681
 682             for(i=0;i<nb_components;i++) {
 683                 int pred, dc;
 684
 685                 topleft[i]= top[i];
 686                 top[i]= buffer[mb_x][i];
 687
 688                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 689
 690                 dc = mjpeg_decode_dc(s, s->dc_index[i]);
 691                 if(dc == 0xFFFF)
 692                     return -1;
 693
 694                 left[i]=
 695                 buffer[mb_x][i]= mask & (pred + (dc << point_transform));
 696             }
 697
 698             if (s->restart_interval && !--s->restart_count) {
 699                 align_get_bits(&s->gb);
 700                 skip_bits(&s->gb, 16); /* skip RSTn */
 701             }
 702         }
 703
 704         if(s->rct){
 705             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 706                 ptr[3*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
 707                 ptr[3*mb_x+0] = buffer[mb_x][1] + ptr[3*mb_x+1];
 708                 ptr[3*mb_x+2] = buffer[mb_x][2] + ptr[3*mb_x+1];
 709             }
 710         }else if(s->pegasus_rct){
 711             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 712                 ptr[3*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
 713                 ptr[3*mb_x+0] = buffer[mb_x][1] + ptr[3*mb_x+1];
 714                 ptr[3*mb_x+2] = buffer[mb_x][2] + ptr[3*mb_x+1];
 715             }
 716         }else{
 717             for(i=0;i<nb_components;i++) {
 718                 int c= s->comp_index[i];
 719                 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 720                     ptr[3*mb_x+2-c] = buffer[mb_x][i];
 721                 }
 722             }
 723         }
 724     }
 725     return 0;
 726 }
 727
 728 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
 729     int i, mb_x, mb_y;
 730     const int nb_components=s->nb_components;
 731     int bits= (s->bits+7)&~7;
 732
 733     point_transform += bits - s->bits;
 734
 735     av_assert0(nb_components==1 || nb_components==3);
 736
 737     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 738         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 739             if (s->restart_interval && !s->restart_count)
 740                 s->restart_count = s->restart_interval;
 741
 742             if(mb_x==0 || mb_y==0 || s->interlaced){
 743                 for(i=0;i<nb_components;i++) {
 744                     uint8_t *ptr;
 745                     uint16_t *ptr16;
 746                     int n, h, v, x, y, c, j, linesize;
 747                     n = s->nb_blocks[i];
 748                     c = s->comp_index[i];
 749                     h = s->h_scount[i];
 750                     v = s->v_scount[i];
 751                     x = 0;
 752                     y = 0;
 753                     linesize= s->linesize[c];
 754
 755                     if(bits>8) linesize /= 2;
 756
 757                     for(j=0; j<n; j++) {
 758                         int pred, dc;
 759
 760                         dc = mjpeg_decode_dc(s, s->dc_index[i]);
 761                         if(dc == 0xFFFF)
 762                             return -1;
 763                         if(bits<=8){
 764                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 765                         if(y==0 && mb_y==0){
 766                             if(x==0 && mb_x==0){
 767                                 pred= 1 << (bits - 1);
 768                             }else{
 769                                 pred= ptr[-1];
 770                             }
 771                         }else{
 772                             if(x==0 && mb_x==0){
 773                                 pred= ptr[-linesize];
 774                             }else{
 775                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 776                             }
 777                         }
 778
 779                         if (s->interlaced && s->bottom_field)
 780                             ptr += linesize >> 1;
 781                         *ptr= pred + (dc << point_transform);
 782                         }else{
 783                             ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
 784                             if(y==0 && mb_y==0){
 785                                 if(x==0 && mb_x==0){
 786                                     pred= 1 << (bits - 1);
 787                                 }else{
 788                                     pred= ptr16[-1];
 789                                 }
 790                             }else{
 791                                 if(x==0 && mb_x==0){
 792                                     pred= ptr16[-linesize];
 793                                 }else{
 794                                     PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
 795                                 }
 796                             }
 797
 798                             if (s->interlaced && s->bottom_field)
 799                                 ptr16 += linesize >> 1;
 800                             *ptr16= pred + (dc << point_transform);
 801                         }
 802                         if (++x == h) {
 803                             x = 0;
 804                             y++;
 805                         }
 806                     }
 807                 }
 808             }else{
 809                 for(i=0;i<nb_components;i++) {
 810                     uint8_t *ptr;
 811                     uint16_t *ptr16;
 812                     int n, h, v, x, y, c, j, linesize, dc;
 813                     n = s->nb_blocks[i];
 814                     c = s->comp_index[i];
 815                     h = s->h_scount[i];
 816                     v = s->v_scount[i];
 817                     x = 0;
 818                     y = 0;
 819                     linesize= s->linesize[c];
 820
 821                     if(bits>8) linesize /= 2;
 822
 823                     for(j=0; j<n; j++) {
 824                         int pred;
 825
 826                         dc = mjpeg_decode_dc(s, s->dc_index[i]);
 827                         if(dc == 0xFFFF)
 828                             return -1;
 829                         if(bits<=8){
 830                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 831                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 832
 833                         *ptr= pred + (dc << point_transform);
 834                         }else{
 835                             ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
 836                             PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
 837
 838                             *ptr16= pred + (dc << point_transform);
 839                         }
 840                         if (++x == h) {
 841                             x = 0;
 842                             y++;
 843                         }
 844                     }
 845                 }
 846             }
 847             if (s->restart_interval && !--s->restart_count) {
 848                 align_get_bits(&s->gb);
 849                 skip_bits(&s->gb, 16); /* skip RSTn */
 850             }
 851         }
 852     }
 853     return 0;
 854 }
 855
 856 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
 857                                               int linesize, int lowres)
 858 {
 859     switch (lowres) {
 860     case 0: copy_block8(dst, src, linesize, linesize, 8);
 861         break;
 862     case 1: copy_block4(dst, src, linesize, linesize, 4);
 863         break;
 864     case 2: copy_block2(dst, src, linesize, linesize, 2);
 865         break;
 866     case 3: *dst = *src;
 867         break;
 868     }
 869 }
 870
 871 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,
 872                              const uint8_t *mb_bitmask, const AVFrame *reference){
 873     int i, mb_x, mb_y;
 874     uint8_t* data[MAX_COMPONENTS];
 875     const uint8_t *reference_data[MAX_COMPONENTS];
 876     int linesize[MAX_COMPONENTS];
 877     GetBitContext mb_bitmask_gb;
 878
 879     if (mb_bitmask) {
 880         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
 881     }
 882
 883     if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
 884         av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
 885         s->flipped = 0;
 886     }
 887     for(i=0; i < nb_components; i++) {
 888         int c = s->comp_index[i];
 889         data[c] = s->picture_ptr->data[c];
 890         reference_data[c] = reference ? reference->data[c] : NULL;
 891         linesize[c]=s->linesize[c];
 892         s->coefs_finished[c] |= 1;
 893         if(s->flipped) {
 894             //picture should be flipped upside-down for this codec
 895             int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
 896             data[c] += offset;
 897             reference_data[c] += offset;
 898             linesize[c] *= -1;
 899         }
 900     }
 901
 902     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 903         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
 904             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
 905
 906             if (s->restart_interval && !s->restart_count)
 907                 s->restart_count = s->restart_interval;
 908
 909             if(get_bits_count(&s->gb)>s->gb.size_in_bits){
 910                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 911                 return -1;
 912             }
 913             for(i=0;i<nb_components;i++) {
 914                 uint8_t *ptr;
 915                 int n, h, v, x, y, c, j;
 916                 int block_offset;
 917                 n = s->nb_blocks[i];
 918                 c = s->comp_index[i];
 919                 h = s->h_scount[i];
 920                 v = s->v_scount[i];
 921                 x = 0;
 922                 y = 0;
 923                 for(j=0;j<n;j++) {
 924                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
 925                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
 926
 927                     if(s->interlaced && s->bottom_field)
 928                         block_offset += linesize[c] >> 1;
 929                     ptr = data[c] + block_offset;
 930                     if(!s->progressive) {
 931                         if (copy_mb) {
 932                             mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);
 933                         } else {
 934                         s->dsp.clear_block(s->block);
 935                         if(decode_block(s, s->block, i,
 936                                      s->dc_index[i], s->ac_index[i],
 937                                      s->quant_matrixes[ s->quant_index[c] ]) < 0) {
 938                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 939                             return -1;
 940                         }
 941                         s->dsp.idct_put(ptr, linesize[c], s->block);
 942                         }
 943                     } else {
 944                         int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
 945                         DCTELEM *block = s->blocks[c][block_idx];
 946                         if(Ah)
 947                             block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
 948                         else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
 949                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
 950                             return -1;
 951                         }
 952                     }
 953 //                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
 954 //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);
 955                     if (++x == h) {
 956                         x = 0;
 957                         y++;
 958                     }
 959                 }
 960             }
 961
 962             if (s->restart_interval) --s->restart_count;
 963             i= 8+((-get_bits_count(&s->gb))&7);
 964             if (s->restart_interval && show_bits(&s->gb, i)  == (1<<i)-1){ /* skip RSTn */
 965                 int pos= get_bits_count(&s->gb);
 966                 align_get_bits(&s->gb);
 967                 while(get_bits_count(&s->gb) < s->gb.size_in_bits && show_bits(&s->gb, 8) == 0xFF)
 968                     skip_bits(&s->gb, 8);
 969                 if(get_bits_count(&s->gb) < s->gb.size_in_bits && (get_bits(&s->gb, 8)&0xF8) == 0xD0){
 970                     for (i=0; i<nb_components; i++) /* reset dc */
 971                         s->last_dc[i] = 1024;
 972                 }else{
 973                     skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
 974                 }
 975             }
 976         }
 977     }
 978     return 0;
 979 }
 980
 981 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
 982     int mb_x, mb_y;
 983     int EOBRUN = 0;
 984     int c = s->comp_index[0];
 985     uint8_t* data = s->picture.data[c];
 986     int linesize = s->linesize[c];
 987     int last_scan = 0;
 988     int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
 989
 990     if(!Al) {
 991         s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
 992         last_scan = !~s->coefs_finished[c];
 993     }
 994
 995     if(s->interlaced && s->bottom_field)
 996         data += linesize >> 1;
 997
 998     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
 999         uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
1000         int block_idx = mb_y * s->block_stride[c];
1001         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1002         uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1003         for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1004             int ret;
1005             if(Ah)
1006                 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1007                                               quant_matrix, ss, se, Al, &EOBRUN);
1008             else
1009                 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1010                                                quant_matrix, ss, se, Al, &EOBRUN);
1011             if(ret < 0) {
1012                 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
1013                 return -1;
1014             }
1015             if(last_scan) {
1016                 s->dsp.idct_put(ptr, linesize, *block);
1017                 ptr += 8 >> s->avctx->lowres;
1018             }
1019         }
1020     }
1021     return 0;
1022 }
1023
1024 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
1025                         const uint8_t *mb_bitmask, const AVFrame *reference)
1026 {
1027     int len, nb_components, i, h, v, predictor, point_transform;
1028     int index, id;
1029     const int block_size= s->lossless ? 1 : 8;
1030     int ilv, prev_shift;
1031
1032     /* XXX: verify len field validity */
1033     len = get_bits(&s->gb, 16);
1034     nb_components = get_bits(&s->gb, 8);
1035     if (nb_components == 0 || nb_components > MAX_COMPONENTS){
1036         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
1037         return -1;
1038     }
1039     if (len != 6+2*nb_components)
1040     {
1041         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1042         return -1;
1043     }
1044     for(i=0;i<nb_components;i++) {
1045         id = get_bits(&s->gb, 8) - 1;
1046         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1047         /* find component index */
1048         for(index=0;index<s->nb_components;index++)
1049             if (id == s->component_id[index])
1050                 break;
1051         if (index == s->nb_components)
1052         {
1053             av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
1054             return -1;
1055         }
1056         /* Metasoft MJPEG codec has Cb and Cr swapped */
1057         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1058             && nb_components == 3 && s->nb_components == 3 && i)
1059             index = 3 - i;
1060
1061         if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1062             index = (i+2)%3;
1063
1064         s->comp_index[i] = index;
1065
1066         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1067         s->h_scount[i] = s->h_count[index];
1068         s->v_scount[i] = s->v_count[index];
1069
1070         s->dc_index[i] = get_bits(&s->gb, 4);
1071         s->ac_index[i] = get_bits(&s->gb, 4);
1072
1073         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
1074             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1075             goto out_of_range;
1076         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
1077             goto out_of_range;
1078     }
1079
1080     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1081     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
1082     if(s->avctx->codec_tag != AV_RL32("CJPG")){
1083         prev_shift = get_bits(&s->gb, 4); /* Ah */
1084         point_transform= get_bits(&s->gb, 4); /* Al */
1085     }else
1086         prev_shift= point_transform= 0;
1087
1088     for(i=0;i<nb_components;i++)
1089         s->last_dc[i] = 1024;
1090
1091     if (nb_components > 1) {
1092         /* interleaved stream */
1093         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
1094         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1095     } else if(!s->ls) { /* skip this for JPEG-LS */
1096         h = s->h_max / s->h_scount[0];
1097         v = s->v_max / s->v_scount[0];
1098         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
1099         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1100         s->nb_blocks[0] = 1;
1101         s->h_scount[0] = 1;
1102         s->v_scount[0] = 1;
1103     }
1104
1105     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1106         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" : "",
1107                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1108                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1109
1110
1111     /* mjpeg-b can have padding bytes between sos and image data, skip them */
1112     for (i = s->mjpb_skiptosod; i > 0; i--)
1113         skip_bits(&s->gb, 8);
1114
1115     if(s->lossless){
1116         av_assert0(s->picture_ptr == &s->picture);
1117         if(CONFIG_JPEGLS_DECODER && s->ls){
1118 //            for(){
1119 //            reset_ls_coding_parameters(s, 0);
1120
1121             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1122                 return -1;
1123         }else{
1124             if(s->rgb){
1125                 if(ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform) < 0)
1126                     return -1;
1127             }else{
1128                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1129                     return -1;
1130             }
1131         }
1132     }else{
1133         if(s->progressive && predictor) {
1134             av_assert0(s->picture_ptr == &s->picture);
1135             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
1136                 return -1;
1137         } else {
1138             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1139                                  mb_bitmask, reference) < 0)
1140                 return -1;
1141         }
1142     }
1143     if (s->yuv421) {
1144         uint8_t *line = s->picture_ptr->data[2];
1145         for (i = 0; i < s->height / 2; i++) {
1146             for (index = s->width - 1; index; index--)
1147                 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1148             line += s->linesize[2];
1149         }
1150     } else if (s->yuv442) {
1151         uint8_t *dst = &((uint8_t *)s->picture_ptr->data[2])[(s->height - 1) * s->linesize[2]];
1152         for (i = s->height - 1; i; i--) {
1153             uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[2])[i / 2 * s->linesize[2]];
1154             uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[2])[(i + 1) / 2 * s->linesize[2]];
1155             if (src1 == src2) {
1156                 memcpy(dst, src1, s->width);
1157             } else {
1158                 for (index = 0; index < s->width; index++)
1159                     dst[index] = (src1[index] + src2[index]) >> 1;
1160             }
1161             dst -= s->linesize[2];
1162         }
1163     }
1164     emms_c();
1165     return 0;
1166  out_of_range:
1167     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1168     return -1;
1169 }
1170
1171 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1172 {
1173     if (get_bits(&s->gb, 16) != 4)
1174         return -1;
1175     s->restart_interval = get_bits(&s->gb, 16);
1176     s->restart_count = 0;
1177     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1178
1179     return 0;
1180 }
1181
1182 static int mjpeg_decode_app(MJpegDecodeContext *s)
1183 {
1184     int len, id, i;
1185
1186     len = get_bits(&s->gb, 16);
1187     if (len < 5)
1188         return -1;
1189     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1190         return -1;
1191
1192     id = get_bits_long(&s->gb, 32);
1193     id = av_be2ne32(id);
1194     len -= 6;
1195
1196     if(s->avctx->debug & FF_DEBUG_STARTCODE){
1197         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1198     }
1199
1200     /* Buggy AVID, it puts EOI only at every 10th frame. */
1201     /* Also, this fourcc is used by non-avid files too, it holds some
1202        information, but it's always present in AVID-created files. */
1203     if (id == AV_RL32("AVI1"))
1204     {
1205         /* structure:
1206             4bytes      AVI1
1207             1bytes      polarity
1208             1bytes      always zero
1209             4bytes      field_size
1210             4bytes      field_size_less_padding
1211         */
1212             s->buggy_avid = 1;
1213 //        if (s->first_picture)
1214 //            printf("mjpeg: workarounding buggy AVID\n");
1215         i = get_bits(&s->gb, 8); len--;
1216         av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1217 #if 0
1218         skip_bits(&s->gb, 8);
1219         skip_bits(&s->gb, 32);
1220         skip_bits(&s->gb, 32);
1221         len -= 10;
1222 #endif
1223 //        if (s->interlace_polarity)
1224 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1225         goto out;
1226     }
1227
1228 //    len -= 2;
1229
1230     if (id == AV_RL32("JFIF"))
1231     {
1232         int t_w, t_h, v1, v2;
1233         skip_bits(&s->gb, 8); /* the trailing zero-byte */
1234         v1= get_bits(&s->gb, 8);
1235         v2= get_bits(&s->gb, 8);
1236         skip_bits(&s->gb, 8);
1237
1238         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1239         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1240
1241         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1242             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1243                 v1, v2,
1244                 s->avctx->sample_aspect_ratio.num,
1245                 s->avctx->sample_aspect_ratio.den
1246             );
1247
1248         t_w = get_bits(&s->gb, 8);
1249         t_h = get_bits(&s->gb, 8);
1250         if (t_w && t_h)
1251         {
1252             /* skip thumbnail */
1253             if (len-10-(t_w*t_h*3) > 0)
1254                 len -= t_w*t_h*3;
1255         }
1256         len -= 10;
1257         goto out;
1258     }
1259
1260     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1261     {
1262         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1263             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1264         skip_bits(&s->gb, 16); /* version */
1265         skip_bits(&s->gb, 16); /* flags0 */
1266         skip_bits(&s->gb, 16); /* flags1 */
1267         skip_bits(&s->gb, 8);  /* transform */
1268         len -= 7;
1269         goto out;
1270     }
1271
1272     if (id == AV_RL32("LJIF")){
1273         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1274             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1275         skip_bits(&s->gb, 16); /* version ? */
1276         skip_bits(&s->gb, 16); /* unknwon always 0? */
1277         skip_bits(&s->gb, 16); /* unknwon always 0? */
1278         skip_bits(&s->gb, 16); /* unknwon always 0? */
1279         switch( get_bits(&s->gb, 8)){
1280         case 1:
1281             s->rgb= 1;
1282             s->pegasus_rct=0;
1283             break;
1284         case 2:
1285             s->rgb= 1;
1286             s->pegasus_rct=1;
1287             break;
1288         default:
1289             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1290         }
1291         len -= 9;
1292         goto out;
1293     }
1294
1295     /* Apple MJPEG-A */
1296     if ((s->start_code == APP1) && (len > (0x28 - 8)))
1297     {
1298         id = get_bits_long(&s->gb, 32);
1299         id = av_be2ne32(id);
1300         len -= 4;
1301         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1302         {
1303 #if 0
1304             skip_bits(&s->gb, 32); /* field size */
1305             skip_bits(&s->gb, 32); /* pad field size */
1306             skip_bits(&s->gb, 32); /* next off */
1307             skip_bits(&s->gb, 32); /* quant off */
1308             skip_bits(&s->gb, 32); /* huff off */
1309             skip_bits(&s->gb, 32); /* image off */
1310             skip_bits(&s->gb, 32); /* scan off */
1311             skip_bits(&s->gb, 32); /* data off */
1312 #endif
1313             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1314                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1315         }
1316     }
1317
1318 out:
1319     /* slow but needed for extreme adobe jpegs */
1320     if (len < 0)
1321         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1322     while(--len > 0)
1323         skip_bits(&s->gb, 8);
1324
1325     return 0;
1326 }
1327
1328 static int mjpeg_decode_com(MJpegDecodeContext *s)
1329 {
1330     int len = get_bits(&s->gb, 16);
1331     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1332         char *cbuf = av_malloc(len - 1);
1333         if (cbuf) {
1334             int i;
1335             for (i = 0; i < len - 2; i++)
1336                 cbuf[i] = get_bits(&s->gb, 8);
1337             if (i > 0 && cbuf[i-1] == '\n')
1338                 cbuf[i-1] = 0;
1339             else
1340                 cbuf[i] = 0;
1341
1342             if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1343                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1344
1345             /* buggy avid, it puts EOI only at every 10th frame */
1346             if (!strcmp(cbuf, "AVID"))
1347             {
1348                 s->buggy_avid = 1;
1349                 //        if (s->first_picture)
1350                 //            printf("mjpeg: workarounding buggy AVID\n");
1351             }
1352             else if(!strcmp(cbuf, "CS=ITU601")){
1353                 s->cs_itu601= 1;
1354             }
1355             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1356                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
1357                 s->flipped = 1;
1358             }
1359
1360             av_free(cbuf);
1361         }
1362     }
1363
1364     return 0;
1365 }
1366
1367 /* return the 8 bit start code value and update the search
1368    state. Return -1 if no start code found */
1369 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1370 {
1371     const uint8_t *buf_ptr;
1372     unsigned int v, v2;
1373     int val;
1374     int skipped=0;
1375
1376     buf_ptr = *pbuf_ptr;
1377     while (buf_ptr < buf_end) {
1378         v = *buf_ptr++;
1379         v2 = *buf_ptr;
1380         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1381             val = *buf_ptr++;
1382             goto found;
1383         }
1384         skipped++;
1385     }
1386     val = -1;
1387 found:
1388     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1389     *pbuf_ptr = buf_ptr;
1390     return val;
1391 }
1392
1393 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1394                          const uint8_t **buf_ptr, const uint8_t *buf_end,
1395                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
1396 {
1397     int start_code;
1398     start_code = find_marker(buf_ptr, buf_end);
1399
1400                 if ((buf_end - *buf_ptr) > s->buffer_size)
1401                 {
1402                     av_free(s->buffer);
1403                     s->buffer_size = buf_end - *buf_ptr;
1404                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1405                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1406                         s->buffer_size);
1407                 }
1408
1409                 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1410                 if (start_code == SOS && !s->ls)
1411                 {
1412                     const uint8_t *src = *buf_ptr;
1413                     uint8_t *dst = s->buffer;
1414
1415                     while (src<buf_end)
1416                     {
1417                         uint8_t x = *(src++);
1418
1419                         *(dst++) = x;
1420                         if (s->avctx->codec_id != CODEC_ID_THP)
1421                         {
1422                             if (x == 0xff) {
1423                                 while (src < buf_end && x == 0xff)
1424                                     x = *(src++);
1425
1426                                 if (x >= 0xd0 && x <= 0xd7)
1427                                     *(dst++) = x;
1428                                 else if (x)
1429                                     break;
1430                             }
1431                         }
1432                     }
1433                     *unescaped_buf_ptr  = s->buffer;
1434                     *unescaped_buf_size = dst - s->buffer;
1435
1436                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1437                            (buf_end - *buf_ptr) - (dst - s->buffer));
1438                 }
1439                 else if(start_code == SOS && s->ls){
1440                     const uint8_t *src = *buf_ptr;
1441                     uint8_t *dst = s->buffer;
1442                     int bit_count = 0;
1443                     int t = 0, b = 0;
1444                     PutBitContext pb;
1445
1446                     s->cur_scan++;
1447
1448                     /* find marker */
1449                     while (src + t < buf_end){
1450                         uint8_t x = src[t++];
1451                         if (x == 0xff){
1452                             while((src + t < buf_end) && x == 0xff)
1453                                 x = src[t++];
1454                             if (x & 0x80) {
1455                                 t -= 2;
1456                                 break;
1457                             }
1458                         }
1459                     }
1460                     bit_count = t * 8;
1461
1462                     init_put_bits(&pb, dst, t);
1463
1464                     /* unescape bitstream */
1465                     while(b < t){
1466                         uint8_t x = src[b++];
1467                         put_bits(&pb, 8, x);
1468                         if(x == 0xFF){
1469                             x = src[b++];
1470                             put_bits(&pb, 7, x);
1471                             bit_count--;
1472                         }
1473                     }
1474                     flush_put_bits(&pb);
1475
1476                     *unescaped_buf_ptr  = dst;
1477                     *unescaped_buf_size = (bit_count + 7) >> 3;
1478                 }
1479                 else
1480                 {
1481                     *unescaped_buf_ptr  = *buf_ptr;
1482                     *unescaped_buf_size = buf_end - *buf_ptr;
1483                 }
1484
1485     return start_code;
1486 }
1487
1488 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1489                               void *data, int *data_size,
1490                               AVPacket *avpkt)
1491 {
1492     const uint8_t *buf = avpkt->data;
1493     int buf_size = avpkt->size;
1494     MJpegDecodeContext *s = avctx->priv_data;
1495     const uint8_t *buf_end, *buf_ptr;
1496     const uint8_t *unescaped_buf_ptr;
1497     int unescaped_buf_size;
1498     int start_code;
1499     AVFrame *picture = data;
1500
1501     s->got_picture = 0; // picture from previous image can not be reused
1502     buf_ptr = buf;
1503     buf_end = buf + buf_size;
1504     while (buf_ptr < buf_end) {
1505         /* find start next marker */
1506         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1507                                           &unescaped_buf_ptr, &unescaped_buf_size);
1508         {
1509             /* EOF */
1510             if (start_code < 0) {
1511                 goto the_end;
1512             } else {
1513                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1514
1515                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
1516
1517                 s->start_code = start_code;
1518                 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1519                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1520                 }
1521
1522                 /* process markers */
1523                 if (start_code >= 0xd0 && start_code <= 0xd7) {
1524                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1525                     /* APP fields */
1526                 } else if (start_code >= APP0 && start_code <= APP15) {
1527                     mjpeg_decode_app(s);
1528                     /* Comment */
1529                 } else if (start_code == COM){
1530                     mjpeg_decode_com(s);
1531                 }
1532
1533                 switch(start_code) {
1534                 case SOI:
1535                     s->restart_interval = 0;
1536
1537                     s->restart_count = 0;
1538                     /* nothing to do on SOI */
1539                     break;
1540                 case DQT:
1541                     ff_mjpeg_decode_dqt(s);
1542                     break;
1543                 case DHT:
1544                     if(ff_mjpeg_decode_dht(s) < 0){
1545                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1546                         return -1;
1547                     }
1548                     break;
1549                 case SOF0:
1550                 case SOF1:
1551                     s->lossless=0;
1552                     s->ls=0;
1553                     s->progressive=0;
1554                     if (ff_mjpeg_decode_sof(s) < 0)
1555                         return -1;
1556                     break;
1557                 case SOF2:
1558                     s->lossless=0;
1559                     s->ls=0;
1560                     s->progressive=1;
1561                     if (ff_mjpeg_decode_sof(s) < 0)
1562                         return -1;
1563                     break;
1564                 case SOF3:
1565                     s->lossless=1;
1566                     s->ls=0;
1567                     s->progressive=0;
1568                     if (ff_mjpeg_decode_sof(s) < 0)
1569                         return -1;
1570                     break;
1571                 case SOF48:
1572                     s->lossless=1;
1573                     s->ls=1;
1574                     s->progressive=0;
1575                     if (ff_mjpeg_decode_sof(s) < 0)
1576                         return -1;
1577                     break;
1578                 case LSE:
1579                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1580                         return -1;
1581                     break;
1582                 case EOI:
1583 eoi_parser:
1584                     s->cur_scan = 0;
1585                     if (!s->got_picture) {
1586                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1587                         break;
1588                     }
1589                     if (s->interlaced) {
1590                         s->bottom_field ^= 1;
1591                         /* if not bottom field, do not output image yet */
1592                         if (s->bottom_field == !s->interlace_polarity)
1593                             break;
1594                     }
1595                     *picture = *s->picture_ptr;
1596                     *data_size = sizeof(AVFrame);
1597
1598                     if(!s->lossless){
1599                         picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1600                         picture->qstride= 0;
1601                         picture->qscale_table= s->qscale_table;
1602                         memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1603                         if(avctx->debug & FF_DEBUG_QP)
1604                             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1605                         picture->quality*= FF_QP2LAMBDA;
1606                     }
1607
1608                     goto the_end;
1609                 case SOS:
1610                     if (!s->got_picture) {
1611                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1612                         break;
1613                     }
1614                     if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1615                         (avctx->err_recognition & AV_EF_EXPLODE))
1616                       return AVERROR_INVALIDDATA;
1617                     break;
1618                 case DRI:
1619                     mjpeg_decode_dri(s);
1620                     break;
1621                 case SOF5:
1622                 case SOF6:
1623                 case SOF7:
1624                 case SOF9:
1625                 case SOF10:
1626                 case SOF11:
1627                 case SOF13:
1628                 case SOF14:
1629                 case SOF15:
1630                 case JPG:
1631                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1632                     break;
1633 //                default:
1634 //                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1635 //                    break;
1636                 }
1637
1638                 /* eof process start code */
1639                 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1640                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1641                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1642             }
1643         }
1644     }
1645     if (s->got_picture) {
1646         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1647         goto eoi_parser;
1648     }
1649     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1650     return -1;
1651 the_end:
1652     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1653 //    return buf_end - buf_ptr;
1654     return buf_ptr - buf;
1655 }
1656
1657 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1658 {
1659     MJpegDecodeContext *s = avctx->priv_data;
1660     int i, j;
1661
1662     if (s->picture_ptr && s->picture_ptr->data[0])
1663         avctx->release_buffer(avctx, s->picture_ptr);
1664
1665     av_free(s->buffer);
1666     av_free(s->qscale_table);
1667     av_freep(&s->ljpeg_buffer);
1668     s->ljpeg_buffer_size=0;
1669
1670     for(i=0;i<3;i++) {
1671         for(j=0;j<4;j++)
1672             free_vlc(&s->vlcs[i][j]);
1673     }
1674     for(i=0; i<MAX_COMPONENTS; i++) {
1675         av_freep(&s->blocks[i]);
1676         av_freep(&s->last_nnz[i]);
1677     }
1678     return 0;
1679 }
1680
1681 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1682 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1683 static const AVOption options[] = {
1684     { "extern_huff",        "Use external huffman table.",  OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1685     { NULL },
1686 };
1687
1688 static const AVClass mjpegdec_class = {
1689     .class_name = "MJPEG decoder",
1690     .item_name  = av_default_item_name,
1691     .option     = options,
1692     .version    = LIBAVUTIL_VERSION_INT,
1693 };
1694
1695 AVCodec ff_mjpeg_decoder = {
1696     .name           = "mjpeg",
1697     .type           = AVMEDIA_TYPE_VIDEO,
1698     .id             = CODEC_ID_MJPEG,
1699     .priv_data_size = sizeof(MJpegDecodeContext),
1700     .init           = ff_mjpeg_decode_init,
1701     .close          = ff_mjpeg_decode_end,
1702     .decode         = ff_mjpeg_decode_frame,
1703     .capabilities   = CODEC_CAP_DR1,
1704     .max_lowres = 3,
1705     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1706     .priv_class     = &mjpegdec_class,
1707 };
1708
1709 AVCodec ff_thp_decoder = {
1710     .name           = "thp",
1711     .type           = AVMEDIA_TYPE_VIDEO,
1712     .id             = CODEC_ID_THP,
1713     .priv_data_size = sizeof(MJpegDecodeContext),
1714     .init           = ff_mjpeg_decode_init,
1715     .close          = ff_mjpeg_decode_end,
1716     .decode         = ff_mjpeg_decode_frame,
1717     .capabilities   = CODEC_CAP_DR1,
1718     .max_lowres = 3,
1719     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1720 };