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libavcodec/mjpegdec.c

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00001 /*
00002  * MJPEG decoder
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  * Copyright (c) 2003 Alex Beregszaszi
00005  * Copyright (c) 2003-2004 Michael Niedermayer
00006  *
00007  * Support for external huffman table, various fixes (AVID workaround),
00008  * aspecting, new decode_frame mechanism and apple mjpeg-b support
00009  *                                  by Alex Beregszaszi
00010  *
00011  * This file is part of FFmpeg.
00012  *
00013  * FFmpeg is free software; you can redistribute it and/or
00014  * modify it under the terms of the GNU Lesser General Public
00015  * License as published by the Free Software Foundation; either
00016  * version 2.1 of the License, or (at your option) any later version.
00017  *
00018  * FFmpeg is distributed in the hope that it will be useful,
00019  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00020  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00021  * Lesser General Public License for more details.
00022  *
00023  * You should have received a copy of the GNU Lesser General Public
00024  * License along with FFmpeg; if not, write to the Free Software
00025  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00026  */
00027 
00033 //#define DEBUG
00034 #include <assert.h>
00035 
00036 #include "libavutil/imgutils.h"
00037 #include "libavutil/avassert.h"
00038 #include "avcodec.h"
00039 #include "dsputil.h"
00040 #include "mjpeg.h"
00041 #include "mjpegdec.h"
00042 #include "jpeglsdec.h"
00043 
00044 
00045 static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
00046                       int nb_codes, int use_static, int is_ac)
00047 {
00048     uint8_t huff_size[256];
00049     uint16_t huff_code[256];
00050     uint16_t huff_sym[256];
00051     int i;
00052 
00053     assert(nb_codes <= 256);
00054 
00055     memset(huff_size, 0, sizeof(huff_size));
00056     ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
00057 
00058     for(i=0; i<256; i++)
00059         huff_sym[i]= i + 16*is_ac;
00060 
00061     if(is_ac) huff_sym[0]= 16*256;
00062 
00063     return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);
00064 }
00065 
00066 static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
00067     build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
00068               ff_mjpeg_val_dc, 12, 0, 0);
00069     build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
00070               ff_mjpeg_val_dc, 12, 0, 0);
00071     build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
00072               ff_mjpeg_val_ac_luminance, 251, 0, 1);
00073     build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
00074               ff_mjpeg_val_ac_chrominance, 251, 0, 1);
00075     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
00076               ff_mjpeg_val_ac_luminance, 251, 0, 0);
00077     build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
00078               ff_mjpeg_val_ac_chrominance, 251, 0, 0);
00079 }
00080 
00081 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
00082 {
00083     MJpegDecodeContext *s = avctx->priv_data;
00084 
00085     if (!s->picture_ptr)
00086         s->picture_ptr = &s->picture;
00087     avcodec_get_frame_defaults(&s->picture);
00088 
00089     s->avctx = avctx;
00090     dsputil_init(&s->dsp, avctx);
00091     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
00092     s->buffer_size = 0;
00093     s->buffer = NULL;
00094     s->start_code = -1;
00095     s->first_picture = 1;
00096     s->org_height = avctx->coded_height;
00097     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
00098 
00099     build_basic_mjpeg_vlc(s);
00100 
00101     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
00102     {
00103         av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
00104         init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
00105         if (ff_mjpeg_decode_dht(s)) {
00106             av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
00107             build_basic_mjpeg_vlc(s);
00108         }
00109     }
00110     if (avctx->extradata_size > 9 &&
00111         AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
00112         if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
00113             s->interlace_polarity = 1; /* bottom field first */
00114             av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
00115         }
00116     }
00117     if (avctx->codec->id == CODEC_ID_AMV)
00118         s->flipped = 1;
00119 
00120     return 0;
00121 }
00122 
00123 
00124 /* quantize tables */
00125 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
00126 {
00127     int len, index, i, j;
00128 
00129     len = get_bits(&s->gb, 16) - 2;
00130 
00131     while (len >= 65) {
00132         /* only 8 bit precision handled */
00133         if (get_bits(&s->gb, 4) != 0)
00134         {
00135             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
00136             return -1;
00137         }
00138         index = get_bits(&s->gb, 4);
00139         if (index >= 4)
00140             return -1;
00141         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
00142         /* read quant table */
00143         for(i=0;i<64;i++) {
00144             j = s->scantable.permutated[i];
00145             s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
00146         }
00147 
00148         //XXX FIXME finetune, and perhaps add dc too
00149         s->qscale[index]= FFMAX(
00150             s->quant_matrixes[index][s->scantable.permutated[1]],
00151             s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
00152         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
00153         len -= 65;
00154     }
00155 
00156     return 0;
00157 }
00158 
00159 /* decode huffman tables and build VLC decoders */
00160 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
00161 {
00162     int len, index, i, class, n, v, code_max;
00163     uint8_t bits_table[17];
00164     uint8_t val_table[256];
00165 
00166     len = get_bits(&s->gb, 16) - 2;
00167 
00168     while (len > 0) {
00169         if (len < 17)
00170             return -1;
00171         class = get_bits(&s->gb, 4);
00172         if (class >= 2)
00173             return -1;
00174         index = get_bits(&s->gb, 4);
00175         if (index >= 4)
00176             return -1;
00177         n = 0;
00178         for(i=1;i<=16;i++) {
00179             bits_table[i] = get_bits(&s->gb, 8);
00180             n += bits_table[i];
00181         }
00182         len -= 17;
00183         if (len < n || n > 256)
00184             return -1;
00185 
00186         code_max = 0;
00187         for(i=0;i<n;i++) {
00188             v = get_bits(&s->gb, 8);
00189             if (v > code_max)
00190                 code_max = v;
00191             val_table[i] = v;
00192         }
00193         len -= n;
00194 
00195         /* build VLC and flush previous vlc if present */
00196         free_vlc(&s->vlcs[class][index]);
00197         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
00198                class, index, code_max + 1);
00199         if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
00200             return -1;
00201         }
00202 
00203         if(class>0){
00204             free_vlc(&s->vlcs[2][index]);
00205             if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){
00206             return -1;
00207             }
00208         }
00209     }
00210     return 0;
00211 }
00212 
00213 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
00214 {
00215     int len, nb_components, i, width, height, pix_fmt_id;
00216 
00217     /* XXX: verify len field validity */
00218     len = get_bits(&s->gb, 16);
00219     s->bits= get_bits(&s->gb, 8);
00220 
00221     if(s->pegasus_rct) s->bits=9;
00222     if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
00223 
00224     if (s->bits != 8 && !s->lossless){
00225         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00226         return -1;
00227     }
00228 
00229     height = get_bits(&s->gb, 16);
00230     width = get_bits(&s->gb, 16);
00231 
00232     //HACK for odd_height.mov
00233     if(s->interlaced && s->width == width && s->height == height + 1)
00234         height= s->height;
00235 
00236     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00237     if(av_image_check_size(width, height, 0, s->avctx))
00238         return -1;
00239 
00240     nb_components = get_bits(&s->gb, 8);
00241     if (nb_components <= 0 ||
00242         nb_components > MAX_COMPONENTS)
00243         return -1;
00244     if (s->ls && !(s->bits <= 8 || nb_components == 1)){
00245         av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
00246         return -1;
00247     }
00248     s->nb_components = nb_components;
00249     s->h_max = 1;
00250     s->v_max = 1;
00251     for(i=0;i<nb_components;i++) {
00252         /* component id */
00253         s->component_id[i] = get_bits(&s->gb, 8) - 1;
00254         s->h_count[i] = get_bits(&s->gb, 4);
00255         s->v_count[i] = get_bits(&s->gb, 4);
00256         /* compute hmax and vmax (only used in interleaved case) */
00257         if (s->h_count[i] > s->h_max)
00258             s->h_max = s->h_count[i];
00259         if (s->v_count[i] > s->v_max)
00260             s->v_max = s->v_count[i];
00261         s->quant_index[i] = get_bits(&s->gb, 8);
00262         if (s->quant_index[i] >= 4)
00263             return -1;
00264         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
00265                s->v_count[i], s->component_id[i], s->quant_index[i]);
00266     }
00267 
00268     if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
00269         av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
00270         return -1;
00271     }
00272 
00273     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
00274 
00275     /* if different size, realloc/alloc picture */
00276     /* XXX: also check h_count and v_count */
00277     if (width != s->width || height != s->height) {
00278         av_freep(&s->qscale_table);
00279 
00280         s->width = width;
00281         s->height = height;
00282         s->interlaced = 0;
00283 
00284         /* test interlaced mode */
00285         if (s->first_picture &&
00286             s->org_height != 0 &&
00287             s->height < ((s->org_height * 3) / 4)) {
00288             s->interlaced = 1;
00289             s->bottom_field = s->interlace_polarity;
00290             s->picture_ptr->interlaced_frame = 1;
00291             s->picture_ptr->top_field_first = !s->interlace_polarity;
00292             height *= 2;
00293         }
00294 
00295         avcodec_set_dimensions(s->avctx, width, height);
00296 
00297         s->qscale_table= av_mallocz((s->width+15)/16);
00298 
00299         s->first_picture = 0;
00300     }
00301 
00302     if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
00303         return 0;
00304 
00305     /* XXX: not complete test ! */
00306     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00307                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00308                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
00309                  (s->h_count[3] <<  4) |  s->v_count[3];
00310     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00311     //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
00312     if(!(pix_fmt_id & 0xD0D0D0D0))
00313         pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
00314     if(!(pix_fmt_id & 0x0D0D0D0D))
00315         pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
00316 
00317     switch(pix_fmt_id){
00318     case 0x11111100:
00319         if(s->rgb){
00320             s->avctx->pix_fmt = PIX_FMT_BGRA;
00321         }else{
00322             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00323             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00324         }
00325         assert(s->nb_components==3);
00326         break;
00327     case 0x11000000:
00328         s->avctx->pix_fmt = PIX_FMT_GRAY8;
00329         break;
00330     case 0x12111100:
00331         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
00332         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00333         break;
00334     case 0x21111100:
00335         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00336         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00337         break;
00338     case 0x22111100:
00339         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
00340         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00341         break;
00342     default:
00343         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00344         return -1;
00345     }
00346     if(s->ls){
00347         if(s->nb_components > 1)
00348             s->avctx->pix_fmt = PIX_FMT_RGB24;
00349         else if(s->bits <= 8)
00350             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00351         else
00352             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00353     }
00354 
00355     if(s->picture_ptr->data[0])
00356         s->avctx->release_buffer(s->avctx, s->picture_ptr);
00357 
00358     if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){
00359         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00360         return -1;
00361     }
00362     s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;
00363     s->picture_ptr->key_frame= 1;
00364     s->got_picture = 1;
00365 
00366     for(i=0; i<3; i++){
00367         s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;
00368     }
00369 
00370 //    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
00371 
00372     if (len != (8+(3*nb_components)))
00373     {
00374         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00375     }
00376 
00377     /* totally blank picture as progressive JPEG will only add details to it */
00378     if(s->progressive){
00379         int bw = (width  + s->h_max*8-1) / (s->h_max*8);
00380         int bh = (height + s->v_max*8-1) / (s->v_max*8);
00381         for(i=0; i<s->nb_components; i++) {
00382             int size = bw * bh * s->h_count[i] * s->v_count[i];
00383             av_freep(&s->blocks[i]);
00384             av_freep(&s->last_nnz[i]);
00385             s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
00386             s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
00387             s->block_stride[i] = bw * s->h_count[i];
00388         }
00389         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00390     }
00391     return 0;
00392 }
00393 
00394 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00395 {
00396     int code;
00397     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00398     if (code < 0)
00399     {
00400         av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
00401                &s->vlcs[0][dc_index]);
00402         return 0xffff;
00403     }
00404 
00405     if(code)
00406         return get_xbits(&s->gb, code);
00407     else
00408         return 0;
00409 }
00410 
00411 /* decode block and dequantize */
00412 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
00413                         int component, int dc_index, int ac_index, int16_t *quant_matrix)
00414 {
00415     int code, i, j, level, val;
00416 
00417     /* DC coef */
00418     val = mjpeg_decode_dc(s, dc_index);
00419     if (val == 0xffff) {
00420         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00421         return -1;
00422     }
00423     val = val * quant_matrix[0] + s->last_dc[component];
00424     s->last_dc[component] = val;
00425     block[0] = val;
00426     /* AC coefs */
00427     i = 0;
00428     {OPEN_READER(re, &s->gb);
00429     do {
00430         UPDATE_CACHE(re, &s->gb);
00431         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00432 
00433         i += ((unsigned)code) >> 4;
00434             code &= 0xf;
00435         if(code){
00436             if(code > MIN_CACHE_BITS - 16){
00437                 UPDATE_CACHE(re, &s->gb);
00438             }
00439             {
00440                 int cache=GET_CACHE(re,&s->gb);
00441                 int sign=(~cache)>>31;
00442                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00443             }
00444 
00445             LAST_SKIP_BITS(re, &s->gb, code);
00446 
00447             if (i > 63) {
00448                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00449                 return -1;
00450             }
00451             j = s->scantable.permutated[i];
00452             block[j] = level * quant_matrix[j];
00453         }
00454     }while(i<63);
00455     CLOSE_READER(re, &s->gb);}
00456 
00457     return 0;
00458 }
00459 
00460 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
00461                                  int dc_index, int16_t *quant_matrix, int Al)
00462 {
00463     int val;
00464     s->dsp.clear_block(block);
00465     val = mjpeg_decode_dc(s, dc_index);
00466     if (val == 0xffff) {
00467         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00468         return -1;
00469     }
00470     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00471     s->last_dc[component] = val;
00472     block[0] = val;
00473     return 0;
00474 }
00475 
00476 /* decode block and dequantize - progressive JPEG version */
00477 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
00478                                     int ac_index, int16_t *quant_matrix,
00479                                     int ss, int se, int Al, int *EOBRUN)
00480 {
00481     int code, i, j, level, val, run;
00482 
00483     if(*EOBRUN){
00484         (*EOBRUN)--;
00485         return 0;
00486     }
00487     {OPEN_READER(re, &s->gb);
00488     for(i=ss;;i++) {
00489         UPDATE_CACHE(re, &s->gb);
00490         GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00491 
00492         run = ((unsigned) code) >> 4;
00493         code &= 0xF;
00494         if(code) {
00495             i += run;
00496             if(code > MIN_CACHE_BITS - 16){
00497                 UPDATE_CACHE(re, &s->gb);
00498             }
00499             {
00500                 int cache=GET_CACHE(re,&s->gb);
00501                 int sign=(~cache)>>31;
00502                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00503             }
00504 
00505             LAST_SKIP_BITS(re, &s->gb, code);
00506 
00507             if (i >= se) {
00508                 if(i == se){
00509                     j = s->scantable.permutated[se];
00510                     block[j] = level * quant_matrix[j] << Al;
00511                     break;
00512                 }
00513                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00514                 return -1;
00515             }
00516             j = s->scantable.permutated[i];
00517             block[j] = level * quant_matrix[j] << Al;
00518         }else{
00519             if(run == 0xF){// ZRL - skip 15 coefficients
00520                 i += 15;
00521                 if (i >= se) {
00522                     av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00523                     return -1;
00524                 }
00525             }else{
00526                 val = (1 << run);
00527                 if(run){
00528                     UPDATE_CACHE(re, &s->gb);
00529                     val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00530                     LAST_SKIP_BITS(re, &s->gb, run);
00531                 }
00532                 *EOBRUN = val - 1;
00533                 break;
00534             }
00535         }
00536     }
00537     CLOSE_READER(re, &s->gb);}
00538     if(i > *last_nnz)
00539         *last_nnz = i;
00540     return 0;
00541 }
00542 
00543 #define REFINE_BIT(j) {\
00544     UPDATE_CACHE(re, &s->gb);\
00545     sign = block[j]>>15;\
00546     block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
00547     LAST_SKIP_BITS(re, &s->gb, 1);\
00548 }
00549 
00550 #define ZERO_RUN \
00551 for(;;i++) {\
00552     if(i > last) {\
00553         i += run;\
00554         if(i > se) {\
00555             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
00556             return -1;\
00557         }\
00558         break;\
00559     }\
00560     j = s->scantable.permutated[i];\
00561     if(block[j])\
00562         REFINE_BIT(j)\
00563     else if(run-- == 0)\
00564         break;\
00565 }
00566 
00567 /* decode block and dequantize - progressive JPEG refinement pass */
00568 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
00569                         int ac_index, int16_t *quant_matrix,
00570                         int ss, int se, int Al, int *EOBRUN)
00571 {
00572     int code, i=ss, j, sign, val, run;
00573     int last = FFMIN(se, *last_nnz);
00574 
00575     OPEN_READER(re, &s->gb);
00576     if(*EOBRUN)
00577         (*EOBRUN)--;
00578     else {
00579         for(;;i++) {
00580             UPDATE_CACHE(re, &s->gb);
00581             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00582 
00583             if(code & 0xF) {
00584                 run = ((unsigned) code) >> 4;
00585                 UPDATE_CACHE(re, &s->gb);
00586                 val = SHOW_UBITS(re, &s->gb, 1);
00587                 LAST_SKIP_BITS(re, &s->gb, 1);
00588                 ZERO_RUN;
00589                 j = s->scantable.permutated[i];
00590                 val--;
00591                 block[j] = ((quant_matrix[j]^val)-val) << Al;
00592                 if(i == se) {
00593                     if(i > *last_nnz)
00594                         *last_nnz = i;
00595                     CLOSE_READER(re, &s->gb);
00596                     return 0;
00597                 }
00598             }else{
00599                 run = ((unsigned) code) >> 4;
00600                 if(run == 0xF){
00601                     ZERO_RUN;
00602                 }else{
00603                     val = run;
00604                     run = (1 << run);
00605                     if(val) {
00606                         UPDATE_CACHE(re, &s->gb);
00607                         run += SHOW_UBITS(re, &s->gb, val);
00608                         LAST_SKIP_BITS(re, &s->gb, val);
00609                     }
00610                     *EOBRUN = run - 1;
00611                     break;
00612                 }
00613             }
00614         }
00615 
00616         if(i > *last_nnz)
00617             *last_nnz = i;
00618     }
00619 
00620     for(;i<=last;i++) {
00621         j = s->scantable.permutated[i];
00622         if(block[j])
00623             REFINE_BIT(j)
00624     }
00625     CLOSE_READER(re, &s->gb);
00626 
00627     return 0;
00628 }
00629 #undef REFINE_BIT
00630 #undef ZERO_RUN
00631 
00632 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
00633     int i, mb_x, mb_y;
00634     uint16_t (*buffer)[4];
00635     int left[3], top[3], topleft[3];
00636     const int linesize= s->linesize[0];
00637     const int mask= (1<<s->bits)-1;
00638 
00639     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00640     buffer= s->ljpeg_buffer;
00641 
00642     for(i=0; i<3; i++){
00643         buffer[0][i]= 1 << (s->bits + point_transform - 1);
00644     }
00645     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
00646         const int modified_predictor= mb_y ? predictor : 1;
00647         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
00648 
00649         if (s->interlaced && s->bottom_field)
00650             ptr += linesize >> 1;
00651 
00652         for(i=0; i<3; i++){
00653             top[i]= left[i]= topleft[i]= buffer[0][i];
00654         }
00655         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00656             if (s->restart_interval && !s->restart_count)
00657                 s->restart_count = s->restart_interval;
00658 
00659             for(i=0;i<3;i++) {
00660                 int pred;
00661 
00662                 topleft[i]= top[i];
00663                 top[i]= buffer[mb_x][i];
00664 
00665                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00666 
00667                 left[i]=
00668                 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
00669             }
00670 
00671             if (s->restart_interval && !--s->restart_count) {
00672                 align_get_bits(&s->gb);
00673                 skip_bits(&s->gb, 16); /* skip RSTn */
00674             }
00675         }
00676 
00677         if(s->rct){
00678             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00679                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
00680                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
00681                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
00682             }
00683         }else if(s->pegasus_rct){
00684             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00685                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
00686                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
00687                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
00688             }
00689         }else{
00690             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00691                 ptr[4*mb_x+0] = buffer[mb_x][2];
00692                 ptr[4*mb_x+1] = buffer[mb_x][1];
00693                 ptr[4*mb_x+2] = buffer[mb_x][0];
00694             }
00695         }
00696     }
00697     return 0;
00698 }
00699 
00700 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
00701     int i, mb_x, mb_y;
00702     const int nb_components=3;
00703 
00704     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
00705         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00706             if (s->restart_interval && !s->restart_count)
00707                 s->restart_count = s->restart_interval;
00708 
00709             if(mb_x==0 || mb_y==0 || s->interlaced){
00710                 for(i=0;i<nb_components;i++) {
00711                     uint8_t *ptr;
00712                     int n, h, v, x, y, c, j, linesize;
00713                     n = s->nb_blocks[i];
00714                     c = s->comp_index[i];
00715                     h = s->h_scount[i];
00716                     v = s->v_scount[i];
00717                     x = 0;
00718                     y = 0;
00719                     linesize= s->linesize[c];
00720 
00721                     for(j=0; j<n; j++) {
00722                         int pred;
00723 
00724                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
00725                         if(y==0 && mb_y==0){
00726                             if(x==0 && mb_x==0){
00727                                 pred= 128 << point_transform;
00728                             }else{
00729                                 pred= ptr[-1];
00730                             }
00731                         }else{
00732                             if(x==0 && mb_x==0){
00733                                 pred= ptr[-linesize];
00734                             }else{
00735                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00736                             }
00737                         }
00738 
00739                         if (s->interlaced && s->bottom_field)
00740                             ptr += linesize >> 1;
00741                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00742 
00743                         if (++x == h) {
00744                             x = 0;
00745                             y++;
00746                         }
00747                     }
00748                 }
00749             }else{
00750                 for(i=0;i<nb_components;i++) {
00751                     uint8_t *ptr;
00752                     int n, h, v, x, y, c, j, linesize;
00753                     n = s->nb_blocks[i];
00754                     c = s->comp_index[i];
00755                     h = s->h_scount[i];
00756                     v = s->v_scount[i];
00757                     x = 0;
00758                     y = 0;
00759                     linesize= s->linesize[c];
00760 
00761                     for(j=0; j<n; j++) {
00762                         int pred;
00763 
00764                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
00765                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00766                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00767                         if (++x == h) {
00768                             x = 0;
00769                             y++;
00770                         }
00771                     }
00772                 }
00773             }
00774             if (s->restart_interval && !--s->restart_count) {
00775                 align_get_bits(&s->gb);
00776                 skip_bits(&s->gb, 16); /* skip RSTn */
00777             }
00778         }
00779     }
00780     return 0;
00781 }
00782 
00783 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00784                                               int linesize, int lowres)
00785 {
00786     switch (lowres) {
00787     case 0: copy_block8(dst, src, linesize, linesize, 8);
00788         break;
00789     case 1: copy_block4(dst, src, linesize, linesize, 4);
00790         break;
00791     case 2: copy_block2(dst, src, linesize, linesize, 2);
00792         break;
00793     case 3: *dst = *src;
00794         break;
00795     }
00796 }
00797 
00798 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,
00799                              const uint8_t *mb_bitmask, const AVFrame *reference){
00800     int i, mb_x, mb_y;
00801     uint8_t* data[MAX_COMPONENTS];
00802     const uint8_t *reference_data[MAX_COMPONENTS];
00803     int linesize[MAX_COMPONENTS];
00804     GetBitContext mb_bitmask_gb;
00805 
00806     if (mb_bitmask) {
00807         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
00808     }
00809 
00810     if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
00811         av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
00812         s->flipped = 0;
00813     }
00814     for(i=0; i < nb_components; i++) {
00815         int c = s->comp_index[i];
00816         data[c] = s->picture_ptr->data[c];
00817         reference_data[c] = reference ? reference->data[c] : NULL;
00818         linesize[c]=s->linesize[c];
00819         s->coefs_finished[c] |= 1;
00820         if(s->flipped) {
00821             //picture should be flipped upside-down for this codec
00822             int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
00823             data[c] += offset;
00824             reference_data[c] += offset;
00825             linesize[c] *= -1;
00826         }
00827     }
00828 
00829     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
00830         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00831             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00832 
00833             if (s->restart_interval && !s->restart_count)
00834                 s->restart_count = s->restart_interval;
00835 
00836             if(get_bits_count(&s->gb)>s->gb.size_in_bits){
00837                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
00838                 return -1;
00839             }
00840             for(i=0;i<nb_components;i++) {
00841                 uint8_t *ptr;
00842                 int n, h, v, x, y, c, j;
00843                 int block_offset;
00844                 n = s->nb_blocks[i];
00845                 c = s->comp_index[i];
00846                 h = s->h_scount[i];
00847                 v = s->v_scount[i];
00848                 x = 0;
00849                 y = 0;
00850                 for(j=0;j<n;j++) {
00851                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
00852                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
00853 
00854                     if(s->interlaced && s->bottom_field)
00855                         block_offset += linesize[c] >> 1;
00856                     ptr = data[c] + block_offset;
00857                     if(!s->progressive) {
00858                         if (copy_mb) {
00859                             mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);
00860                         } else {
00861                         s->dsp.clear_block(s->block);
00862                         if(decode_block(s, s->block, i,
00863                                      s->dc_index[i], s->ac_index[i],
00864                                      s->quant_matrixes[ s->quant_index[c] ]) < 0) {
00865                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
00866                             return -1;
00867                         }
00868                         s->dsp.idct_put(ptr, linesize[c], s->block);
00869                         }
00870                     } else {
00871                         int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
00872                         DCTELEM *block = s->blocks[c][block_idx];
00873                         if(Ah)
00874                             block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
00875                         else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
00876                             av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
00877                             return -1;
00878                         }
00879                     }
00880 //                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
00881 //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);
00882                     if (++x == h) {
00883                         x = 0;
00884                         y++;
00885                     }
00886                 }
00887             }
00888 
00889             if (s->restart_interval) --s->restart_count;
00890             i= 8+((-get_bits_count(&s->gb))&7);
00891             if (s->restart_interval && show_bits(&s->gb, i)  == (1<<i)-1){ /* skip RSTn */
00892                 int pos= get_bits_count(&s->gb);
00893                 align_get_bits(&s->gb);
00894                 while(show_bits(&s->gb, 8) == 0xFF)
00895                     skip_bits(&s->gb, 8);
00896                 if((get_bits(&s->gb, 8)&0xF8) == 0xD0){
00897                     for (i=0; i<nb_components; i++) /* reset dc */
00898                         s->last_dc[i] = 1024;
00899                 }else{
00900                     skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
00901                 }
00902             }
00903         }
00904     }
00905     return 0;
00906 }
00907 
00908 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
00909     int mb_x, mb_y;
00910     int EOBRUN = 0;
00911     int c = s->comp_index[0];
00912     uint8_t* data = s->picture.data[c];
00913     int linesize = s->linesize[c];
00914     int last_scan = 0;
00915     int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
00916 
00917     if(!Al) {
00918         s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
00919         last_scan = !~s->coefs_finished[c];
00920     }
00921 
00922     if(s->interlaced && s->bottom_field)
00923         data += linesize >> 1;
00924 
00925     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
00926         uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
00927         int block_idx = mb_y * s->block_stride[c];
00928         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
00929         uint8_t *last_nnz = &s->last_nnz[c][block_idx];
00930         for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
00931             int ret;
00932             if(Ah)
00933                 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
00934                                               quant_matrix, ss, se, Al, &EOBRUN);
00935             else
00936                 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
00937                                                quant_matrix, ss, se, Al, &EOBRUN);
00938             if(ret < 0) {
00939                 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
00940                 return -1;
00941             }
00942             if(last_scan) {
00943                 s->dsp.idct_put(ptr, linesize, *block);
00944                 ptr += 8 >> s->avctx->lowres;
00945             }
00946         }
00947     }
00948     return 0;
00949 }
00950 
00951 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
00952                         const uint8_t *mb_bitmask, const AVFrame *reference)
00953 {
00954     int len, nb_components, i, h, v, predictor, point_transform;
00955     int index, id;
00956     const int block_size= s->lossless ? 1 : 8;
00957     int ilv, prev_shift;
00958 
00959     /* XXX: verify len field validity */
00960     len = get_bits(&s->gb, 16);
00961     nb_components = get_bits(&s->gb, 8);
00962     if (nb_components == 0 || nb_components > MAX_COMPONENTS){
00963         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
00964         return -1;
00965     }
00966     if (len != 6+2*nb_components)
00967     {
00968         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
00969         return -1;
00970     }
00971     for(i=0;i<nb_components;i++) {
00972         id = get_bits(&s->gb, 8) - 1;
00973         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
00974         /* find component index */
00975         for(index=0;index<s->nb_components;index++)
00976             if (id == s->component_id[index])
00977                 break;
00978         if (index == s->nb_components)
00979         {
00980             av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
00981             return -1;
00982         }
00983         /* Metasoft MJPEG codec has Cb and Cr swapped */
00984         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
00985             && nb_components == 3 && s->nb_components == 3 && i)
00986             index = 3 - i;
00987 
00988         s->comp_index[i] = index;
00989 
00990         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
00991         s->h_scount[i] = s->h_count[index];
00992         s->v_scount[i] = s->v_count[index];
00993 
00994         s->dc_index[i] = get_bits(&s->gb, 4);
00995         s->ac_index[i] = get_bits(&s->gb, 4);
00996 
00997         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
00998             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
00999             goto out_of_range;
01000         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
01001             goto out_of_range;
01002     }
01003 
01004     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
01005     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
01006     if(s->avctx->codec_tag != AV_RL32("CJPG")){
01007         prev_shift = get_bits(&s->gb, 4); /* Ah */
01008         point_transform= get_bits(&s->gb, 4); /* Al */
01009     }else
01010         prev_shift= point_transform= 0;
01011 
01012     for(i=0;i<nb_components;i++)
01013         s->last_dc[i] = 1024;
01014 
01015     if (nb_components > 1) {
01016         /* interleaved stream */
01017         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
01018         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01019     } else if(!s->ls) { /* skip this for JPEG-LS */
01020         h = s->h_max / s->h_scount[0];
01021         v = s->v_max / s->v_scount[0];
01022         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
01023         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
01024         s->nb_blocks[0] = 1;
01025         s->h_scount[0] = 1;
01026         s->v_scount[0] = 1;
01027     }
01028 
01029     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
01030         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01031                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
01032                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
01033 
01034 
01035     /* mjpeg-b can have padding bytes between sos and image data, skip them */
01036     for (i = s->mjpb_skiptosod; i > 0; i--)
01037         skip_bits(&s->gb, 8);
01038 
01039     if(s->lossless){
01040         av_assert0(s->picture_ptr == &s->picture);
01041         if(CONFIG_JPEGLS_DECODER && s->ls){
01042 //            for(){
01043 //            reset_ls_coding_parameters(s, 0);
01044 
01045             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
01046                 return -1;
01047         }else{
01048             if(s->rgb){
01049                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
01050                     return -1;
01051             }else{
01052                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
01053                     return -1;
01054             }
01055         }
01056     }else{
01057         if(s->progressive && predictor) {
01058             av_assert0(s->picture_ptr == &s->picture);
01059             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
01060                 return -1;
01061         } else {
01062             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
01063                                  mb_bitmask, reference) < 0)
01064                 return -1;
01065         }
01066     }
01067     emms_c();
01068     return 0;
01069  out_of_range:
01070     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01071     return -1;
01072 }
01073 
01074 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01075 {
01076     if (get_bits(&s->gb, 16) != 4)
01077         return -1;
01078     s->restart_interval = get_bits(&s->gb, 16);
01079     s->restart_count = 0;
01080     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
01081 
01082     return 0;
01083 }
01084 
01085 static int mjpeg_decode_app(MJpegDecodeContext *s)
01086 {
01087     int len, id, i;
01088 
01089     len = get_bits(&s->gb, 16);
01090     if (len < 5)
01091         return -1;
01092     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
01093         return -1;
01094 
01095     id = get_bits_long(&s->gb, 32);
01096     id = av_be2ne32(id);
01097     len -= 6;
01098 
01099     if(s->avctx->debug & FF_DEBUG_STARTCODE){
01100         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01101     }
01102 
01103     /* buggy AVID, it puts EOI only at every 10th frame */
01104     /* also this fourcc is used by non-avid files too, it holds some
01105        informations, but it's always present in AVID creates files */
01106     if (id == AV_RL32("AVI1"))
01107     {
01108         /* structure:
01109             4bytes      AVI1
01110             1bytes      polarity
01111             1bytes      always zero
01112             4bytes      field_size
01113             4bytes      field_size_less_padding
01114         */
01115             s->buggy_avid = 1;
01116 //        if (s->first_picture)
01117 //            printf("mjpeg: workarounding buggy AVID\n");
01118         i = get_bits(&s->gb, 8);
01119         if     (i==2) s->bottom_field= 1;
01120         else if(i==1) s->bottom_field= 0;
01121 #if 0
01122         skip_bits(&s->gb, 8);
01123         skip_bits(&s->gb, 32);
01124         skip_bits(&s->gb, 32);
01125         len -= 10;
01126 #endif
01127 //        if (s->interlace_polarity)
01128 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
01129         goto out;
01130     }
01131 
01132 //    len -= 2;
01133 
01134     if (id == AV_RL32("JFIF"))
01135     {
01136         int t_w, t_h, v1, v2;
01137         skip_bits(&s->gb, 8); /* the trailing zero-byte */
01138         v1= get_bits(&s->gb, 8);
01139         v2= get_bits(&s->gb, 8);
01140         skip_bits(&s->gb, 8);
01141 
01142         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
01143         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
01144 
01145         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01146             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01147                 v1, v2,
01148                 s->avctx->sample_aspect_ratio.num,
01149                 s->avctx->sample_aspect_ratio.den
01150             );
01151 
01152         t_w = get_bits(&s->gb, 8);
01153         t_h = get_bits(&s->gb, 8);
01154         if (t_w && t_h)
01155         {
01156             /* skip thumbnail */
01157             if (len-10-(t_w*t_h*3) > 0)
01158                 len -= t_w*t_h*3;
01159         }
01160         len -= 10;
01161         goto out;
01162     }
01163 
01164     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
01165     {
01166         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01167             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01168         skip_bits(&s->gb, 16); /* version */
01169         skip_bits(&s->gb, 16); /* flags0 */
01170         skip_bits(&s->gb, 16); /* flags1 */
01171         skip_bits(&s->gb, 8);  /* transform */
01172         len -= 7;
01173         goto out;
01174     }
01175 
01176     if (id == AV_RL32("LJIF")){
01177         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01178             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
01179         skip_bits(&s->gb, 16); /* version ? */
01180         skip_bits(&s->gb, 16); /* unknwon always 0? */
01181         skip_bits(&s->gb, 16); /* unknwon always 0? */
01182         skip_bits(&s->gb, 16); /* unknwon always 0? */
01183         switch( get_bits(&s->gb, 8)){
01184         case 1:
01185             s->rgb= 1;
01186             s->pegasus_rct=0;
01187             break;
01188         case 2:
01189             s->rgb= 1;
01190             s->pegasus_rct=1;
01191             break;
01192         default:
01193             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01194         }
01195         len -= 9;
01196         goto out;
01197     }
01198 
01199     /* Apple MJPEG-A */
01200     if ((s->start_code == APP1) && (len > (0x28 - 8)))
01201     {
01202         id = get_bits_long(&s->gb, 32);
01203         id = av_be2ne32(id);
01204         len -= 4;
01205         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
01206         {
01207 #if 0
01208             skip_bits(&s->gb, 32); /* field size */
01209             skip_bits(&s->gb, 32); /* pad field size */
01210             skip_bits(&s->gb, 32); /* next off */
01211             skip_bits(&s->gb, 32); /* quant off */
01212             skip_bits(&s->gb, 32); /* huff off */
01213             skip_bits(&s->gb, 32); /* image off */
01214             skip_bits(&s->gb, 32); /* scan off */
01215             skip_bits(&s->gb, 32); /* data off */
01216 #endif
01217             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01218                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01219         }
01220     }
01221 
01222 out:
01223     /* slow but needed for extreme adobe jpegs */
01224     if (len < 0)
01225         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
01226     while(--len > 0)
01227         skip_bits(&s->gb, 8);
01228 
01229     return 0;
01230 }
01231 
01232 static int mjpeg_decode_com(MJpegDecodeContext *s)
01233 {
01234     int len = get_bits(&s->gb, 16);
01235     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
01236         char *cbuf = av_malloc(len - 1);
01237         if (cbuf) {
01238             int i;
01239             for (i = 0; i < len - 2; i++)
01240                 cbuf[i] = get_bits(&s->gb, 8);
01241             if (i > 0 && cbuf[i-1] == '\n')
01242                 cbuf[i-1] = 0;
01243             else
01244                 cbuf[i] = 0;
01245 
01246             if(s->avctx->debug & FF_DEBUG_PICT_INFO)
01247                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
01248 
01249             /* buggy avid, it puts EOI only at every 10th frame */
01250             if (!strcmp(cbuf, "AVID"))
01251             {
01252                 s->buggy_avid = 1;
01253                 //        if (s->first_picture)
01254                 //            printf("mjpeg: workarounding buggy AVID\n");
01255             }
01256             else if(!strcmp(cbuf, "CS=ITU601")){
01257                 s->cs_itu601= 1;
01258             }
01259             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
01260                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
01261                 s->flipped = 1;
01262             }
01263 
01264             av_free(cbuf);
01265         }
01266     }
01267 
01268     return 0;
01269 }
01270 
01271 #if 0
01272 static int valid_marker_list[] =
01273 {
01274         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
01275 /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01276 /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01277 /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01278 /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01279 /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01280 /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01281 /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01282 /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01283 /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01284 /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01285 /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01286 /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
01287 /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
01288 /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
01289 /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
01290 /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
01291 }
01292 #endif
01293 
01294 /* return the 8 bit start code value and update the search
01295    state. Return -1 if no start code found */
01296 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01297 {
01298     const uint8_t *buf_ptr;
01299     unsigned int v, v2;
01300     int val;
01301     int skipped=0;
01302 
01303     buf_ptr = *pbuf_ptr;
01304     while (buf_ptr < buf_end) {
01305         v = *buf_ptr++;
01306         v2 = *buf_ptr;
01307         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01308             val = *buf_ptr++;
01309             goto found;
01310         }
01311         skipped++;
01312     }
01313     val = -1;
01314 found:
01315     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01316     *pbuf_ptr = buf_ptr;
01317     return val;
01318 }
01319 
01320 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01321                          const uint8_t **buf_ptr, const uint8_t *buf_end,
01322                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
01323 {
01324     int start_code;
01325     start_code = find_marker(buf_ptr, buf_end);
01326 
01327                 if ((buf_end - *buf_ptr) > s->buffer_size)
01328                 {
01329                     av_free(s->buffer);
01330                     s->buffer_size = buf_end - *buf_ptr;
01331                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
01332                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
01333                         s->buffer_size);
01334                 }
01335 
01336                 /* unescape buffer of SOS, use special treatment for JPEG-LS */
01337                 if (start_code == SOS && !s->ls)
01338                 {
01339                     const uint8_t *src = *buf_ptr;
01340                     uint8_t *dst = s->buffer;
01341 
01342                     while (src<buf_end)
01343                     {
01344                         uint8_t x = *(src++);
01345 
01346                         *(dst++) = x;
01347                         if (s->avctx->codec_id != CODEC_ID_THP)
01348                         {
01349                             if (x == 0xff) {
01350                                 while (src < buf_end && x == 0xff)
01351                                     x = *(src++);
01352 
01353                                 if (x >= 0xd0 && x <= 0xd7)
01354                                     *(dst++) = x;
01355                                 else if (x)
01356                                     break;
01357                             }
01358                         }
01359                     }
01360                     *unescaped_buf_ptr  = s->buffer;
01361                     *unescaped_buf_size = dst - s->buffer;
01362 
01363                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01364                            (buf_end - *buf_ptr) - (dst - s->buffer));
01365                 }
01366                 else if(start_code == SOS && s->ls){
01367                     const uint8_t *src = *buf_ptr;
01368                     uint8_t *dst = s->buffer;
01369                     int bit_count = 0;
01370                     int t = 0, b = 0;
01371                     PutBitContext pb;
01372 
01373                     s->cur_scan++;
01374 
01375                     /* find marker */
01376                     while (src + t < buf_end){
01377                         uint8_t x = src[t++];
01378                         if (x == 0xff){
01379                             while((src + t < buf_end) && x == 0xff)
01380                                 x = src[t++];
01381                             if (x & 0x80) {
01382                                 t -= 2;
01383                                 break;
01384                             }
01385                         }
01386                     }
01387                     bit_count = t * 8;
01388 
01389                     init_put_bits(&pb, dst, t);
01390 
01391                     /* unescape bitstream */
01392                     while(b < t){
01393                         uint8_t x = src[b++];
01394                         put_bits(&pb, 8, x);
01395                         if(x == 0xFF){
01396                             x = src[b++];
01397                             put_bits(&pb, 7, x);
01398                             bit_count--;
01399                         }
01400                     }
01401                     flush_put_bits(&pb);
01402 
01403                     *unescaped_buf_ptr  = dst;
01404                     *unescaped_buf_size = (bit_count + 7) >> 3;
01405                 }
01406                 else
01407                 {
01408                     *unescaped_buf_ptr  = *buf_ptr;
01409                     *unescaped_buf_size = buf_end - *buf_ptr;
01410                 }
01411 
01412     return start_code;
01413 }
01414 
01415 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
01416                               void *data, int *data_size,
01417                               AVPacket *avpkt)
01418 {
01419     const uint8_t *buf = avpkt->data;
01420     int buf_size = avpkt->size;
01421     MJpegDecodeContext *s = avctx->priv_data;
01422     const uint8_t *buf_end, *buf_ptr;
01423     const uint8_t *unescaped_buf_ptr;
01424     int unescaped_buf_size;
01425     int start_code;
01426     AVFrame *picture = data;
01427 
01428     s->got_picture = 0; // picture from previous image can not be reused
01429     buf_ptr = buf;
01430     buf_end = buf + buf_size;
01431     while (buf_ptr < buf_end) {
01432         /* find start next marker */
01433         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01434                                           &unescaped_buf_ptr, &unescaped_buf_size);
01435         {
01436             /* EOF */
01437             if (start_code < 0) {
01438                 goto the_end;
01439             } else {
01440                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
01441 
01442                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
01443 
01444                 s->start_code = start_code;
01445                 if(s->avctx->debug & FF_DEBUG_STARTCODE){
01446                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01447                 }
01448 
01449                 /* process markers */
01450                 if (start_code >= 0xd0 && start_code <= 0xd7) {
01451                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
01452                     /* APP fields */
01453                 } else if (start_code >= APP0 && start_code <= APP15) {
01454                     mjpeg_decode_app(s);
01455                     /* Comment */
01456                 } else if (start_code == COM){
01457                     mjpeg_decode_com(s);
01458                 }
01459 
01460                 switch(start_code) {
01461                 case SOI:
01462                     s->restart_interval = 0;
01463 
01464                     s->restart_count = 0;
01465                     /* nothing to do on SOI */
01466                     break;
01467                 case DQT:
01468                     ff_mjpeg_decode_dqt(s);
01469                     break;
01470                 case DHT:
01471                     if(ff_mjpeg_decode_dht(s) < 0){
01472                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01473                         return -1;
01474                     }
01475                     break;
01476                 case SOF0:
01477                 case SOF1:
01478                     s->lossless=0;
01479                     s->ls=0;
01480                     s->progressive=0;
01481                     if (ff_mjpeg_decode_sof(s) < 0)
01482                         return -1;
01483                     break;
01484                 case SOF2:
01485                     s->lossless=0;
01486                     s->ls=0;
01487                     s->progressive=1;
01488                     if (ff_mjpeg_decode_sof(s) < 0)
01489                         return -1;
01490                     break;
01491                 case SOF3:
01492                     s->lossless=1;
01493                     s->ls=0;
01494                     s->progressive=0;
01495                     if (ff_mjpeg_decode_sof(s) < 0)
01496                         return -1;
01497                     break;
01498                 case SOF48:
01499                     s->lossless=1;
01500                     s->ls=1;
01501                     s->progressive=0;
01502                     if (ff_mjpeg_decode_sof(s) < 0)
01503                         return -1;
01504                     break;
01505                 case LSE:
01506                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
01507                         return -1;
01508                     break;
01509                 case EOI:
01510                     s->cur_scan = 0;
01511                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01512                         break;
01513 eoi_parser:
01514                     if (!s->got_picture) {
01515                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
01516                         break;
01517                     }
01518                     {
01519                         if (s->interlaced) {
01520                             s->bottom_field ^= 1;
01521                             /* if not bottom field, do not output image yet */
01522                             if (s->bottom_field == !s->interlace_polarity)
01523                                 goto not_the_end;
01524                         }
01525                         *picture = *s->picture_ptr;
01526                         *data_size = sizeof(AVFrame);
01527 
01528                         if(!s->lossless){
01529                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
01530                             picture->qstride= 0;
01531                             picture->qscale_table= s->qscale_table;
01532                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);
01533                             if(avctx->debug & FF_DEBUG_QP)
01534                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
01535                             picture->quality*= FF_QP2LAMBDA;
01536                         }
01537 
01538                         goto the_end;
01539                     }
01540                     break;
01541                 case SOS:
01542                     if (!s->got_picture) {
01543                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
01544                         break;
01545                     }
01546                     ff_mjpeg_decode_sos(s, NULL, NULL);
01547                     /* buggy avid puts EOI every 10-20th frame */
01548                     /* if restart period is over process EOI */
01549                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01550                         goto eoi_parser;
01551                     break;
01552                 case DRI:
01553                     mjpeg_decode_dri(s);
01554                     break;
01555                 case SOF5:
01556                 case SOF6:
01557                 case SOF7:
01558                 case SOF9:
01559                 case SOF10:
01560                 case SOF11:
01561                 case SOF13:
01562                 case SOF14:
01563                 case SOF15:
01564                 case JPG:
01565                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
01566                     break;
01567 //                default:
01568 //                    printf("mjpeg: unsupported marker (%x)\n", start_code);
01569 //                    break;
01570                 }
01571 
01572 not_the_end:
01573                 /* eof process start code */
01574                 buf_ptr += (get_bits_count(&s->gb)+7)/8;
01575                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
01576                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
01577             }
01578         }
01579     }
01580     if (s->got_picture) {
01581         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01582         goto eoi_parser;
01583     }
01584     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01585     return -1;
01586 the_end:
01587     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
01588 //    return buf_end - buf_ptr;
01589     return buf_ptr - buf;
01590 }
01591 
01592 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01593 {
01594     MJpegDecodeContext *s = avctx->priv_data;
01595     int i, j;
01596 
01597     if (s->picture_ptr && s->picture_ptr->data[0])
01598         avctx->release_buffer(avctx, s->picture_ptr);
01599 
01600     av_free(s->buffer);
01601     av_free(s->qscale_table);
01602     av_freep(&s->ljpeg_buffer);
01603     s->ljpeg_buffer_size=0;
01604 
01605     for(i=0;i<3;i++) {
01606         for(j=0;j<4;j++)
01607             free_vlc(&s->vlcs[i][j]);
01608     }
01609     for(i=0; i<MAX_COMPONENTS; i++) {
01610         av_freep(&s->blocks[i]);
01611         av_freep(&s->last_nnz[i]);
01612     }
01613     return 0;
01614 }
01615 
01616 AVCodec ff_mjpeg_decoder = {
01617     "mjpeg",
01618     AVMEDIA_TYPE_VIDEO,
01619     CODEC_ID_MJPEG,
01620     sizeof(MJpegDecodeContext),
01621     ff_mjpeg_decode_init,
01622     NULL,
01623     ff_mjpeg_decode_end,
01624     ff_mjpeg_decode_frame,
01625     CODEC_CAP_DR1,
01626     NULL,
01627     .max_lowres = 3,
01628     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01629 };
01630 
01631 AVCodec ff_thp_decoder = {
01632     "thp",
01633     AVMEDIA_TYPE_VIDEO,
01634     CODEC_ID_THP,
01635     sizeof(MJpegDecodeContext),
01636     ff_mjpeg_decode_init,
01637     NULL,
01638     ff_mjpeg_decode_end,
01639     ff_mjpeg_decode_frame,
01640     CODEC_CAP_DR1,
01641     NULL,
01642     .max_lowres = 3,
01643     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01644 };

Generated on Wed Apr 11 2012 07:31:34 for FFmpeg by  doxygen 1.7.1