• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/h261dec.c

Go to the documentation of this file.
00001 /*
00002  * H261 decoder
00003  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
00004  * Copyright (c) 2004 Maarten Daniels
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 #include "dsputil.h"
00029 #include "avcodec.h"
00030 #include "mpegvideo.h"
00031 #include "h263.h"
00032 #include "h261.h"
00033 #include "h261data.h"
00034 
00035 #define H261_MBA_VLC_BITS 9
00036 #define H261_MTYPE_VLC_BITS 6
00037 #define H261_MV_VLC_BITS 7
00038 #define H261_CBP_VLC_BITS 9
00039 #define TCOEFF_VLC_BITS 9
00040 #define MBA_STUFFING 33
00041 #define MBA_STARTCODE 34
00042 
00043 extern uint8_t ff_h261_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];
00044 
00045 static VLC h261_mba_vlc;
00046 static VLC h261_mtype_vlc;
00047 static VLC h261_mv_vlc;
00048 static VLC h261_cbp_vlc;
00049 
00050 static int h261_decode_block(H261Context * h, DCTELEM * block, int n, int coded);
00051 
00052 static av_cold void h261_decode_init_vlc(H261Context *h){
00053     static int done = 0;
00054 
00055     if(!done){
00056         done = 1;
00057         INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
00058                  h261_mba_bits, 1, 1,
00059                  h261_mba_code, 1, 1, 662);
00060         INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
00061                  h261_mtype_bits, 1, 1,
00062                  h261_mtype_code, 1, 1, 80);
00063         INIT_VLC_STATIC(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
00064                  &h261_mv_tab[0][1], 2, 1,
00065                  &h261_mv_tab[0][0], 2, 1, 144);
00066         INIT_VLC_STATIC(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
00067                  &h261_cbp_tab[0][1], 2, 1,
00068                  &h261_cbp_tab[0][0], 2, 1, 512);
00069         init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
00070         INIT_VLC_RL(h261_rl_tcoeff, 552);
00071     }
00072 }
00073 
00074 static av_cold int h261_decode_init(AVCodecContext *avctx){
00075     H261Context *h= avctx->priv_data;
00076     MpegEncContext * const s = &h->s;
00077 
00078     // set defaults
00079     MPV_decode_defaults(s);
00080     s->avctx = avctx;
00081 
00082     s->width  = s->avctx->coded_width;
00083     s->height = s->avctx->coded_height;
00084     s->codec_id = s->avctx->codec->id;
00085 
00086     s->out_format = FMT_H261;
00087     s->low_delay= 1;
00088     avctx->pix_fmt= PIX_FMT_YUV420P;
00089 
00090     s->codec_id= avctx->codec->id;
00091 
00092     h261_decode_init_vlc(h);
00093 
00094     h->gob_start_code_skipped = 0;
00095 
00096     return 0;
00097 }
00098 
00103 static int h261_decode_gob_header(H261Context *h){
00104     unsigned int val;
00105     MpegEncContext * const s = &h->s;
00106 
00107     if ( !h->gob_start_code_skipped ){
00108         /* Check for GOB Start Code */
00109         val = show_bits(&s->gb, 15);
00110         if(val)
00111             return -1;
00112 
00113         /* We have a GBSC */
00114         skip_bits(&s->gb, 16);
00115     }
00116 
00117     h->gob_start_code_skipped = 0;
00118 
00119     h->gob_number = get_bits(&s->gb, 4); /* GN */
00120     s->qscale = get_bits(&s->gb, 5); /* GQUANT */
00121 
00122     /* Check if gob_number is valid */
00123     if (s->mb_height==18){ //cif
00124         if ((h->gob_number<=0) || (h->gob_number>12))
00125             return -1;
00126     }
00127     else{ //qcif
00128         if ((h->gob_number!=1) && (h->gob_number!=3) && (h->gob_number!=5))
00129             return -1;
00130     }
00131 
00132     /* GEI */
00133     while (get_bits1(&s->gb) != 0) {
00134         skip_bits(&s->gb, 8);
00135     }
00136 
00137     if(s->qscale==0) {
00138         av_log(s->avctx, AV_LOG_ERROR, "qscale has forbidden 0 value\n");
00139         if (s->avctx->error_recognition >= FF_ER_COMPLIANT)
00140             return -1;
00141     }
00142 
00143     // For the first transmitted macroblock in a GOB, MBA is the absolute address. For
00144     // subsequent macroblocks, MBA is the difference between the absolute addresses of
00145     // the macroblock and the last transmitted macroblock.
00146     h->current_mba = 0;
00147     h->mba_diff = 0;
00148 
00149     return 0;
00150 }
00151 
00156 static int ff_h261_resync(H261Context *h){
00157     MpegEncContext * const s = &h->s;
00158     int left, ret;
00159 
00160     if ( h->gob_start_code_skipped ){
00161         ret= h261_decode_gob_header(h);
00162         if(ret>=0)
00163             return 0;
00164     }
00165     else{
00166         if(show_bits(&s->gb, 15)==0){
00167             ret= h261_decode_gob_header(h);
00168             if(ret>=0)
00169                 return 0;
00170         }
00171         //OK, it is not where it is supposed to be ...
00172         s->gb= s->last_resync_gb;
00173         align_get_bits(&s->gb);
00174         left= get_bits_left(&s->gb);
00175 
00176         for(;left>15+1+4+5; left-=8){
00177             if(show_bits(&s->gb, 15)==0){
00178                 GetBitContext bak= s->gb;
00179 
00180                 ret= h261_decode_gob_header(h);
00181                 if(ret>=0)
00182                     return 0;
00183 
00184                 s->gb= bak;
00185             }
00186             skip_bits(&s->gb, 8);
00187         }
00188     }
00189 
00190     return -1;
00191 }
00192 
00197 static int h261_decode_mb_skipped(H261Context *h, int mba1, int mba2 )
00198 {
00199     MpegEncContext * const s = &h->s;
00200     int i;
00201 
00202     s->mb_intra = 0;
00203 
00204     for(i=mba1; i<mba2; i++){
00205         int j, xy;
00206 
00207         s->mb_x= ((h->gob_number-1) % 2) * 11 + i % 11;
00208         s->mb_y= ((h->gob_number-1) / 2) * 3 + i / 11;
00209         xy = s->mb_x + s->mb_y * s->mb_stride;
00210         ff_init_block_index(s);
00211         ff_update_block_index(s);
00212 
00213         for(j=0;j<6;j++)
00214             s->block_last_index[j] = -1;
00215 
00216         s->mv_dir = MV_DIR_FORWARD;
00217         s->mv_type = MV_TYPE_16X16;
00218         s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
00219         s->mv[0][0][0] = 0;
00220         s->mv[0][0][1] = 0;
00221         s->mb_skipped = 1;
00222         h->mtype &= ~MB_TYPE_H261_FIL;
00223 
00224         MPV_decode_mb(s, s->block);
00225     }
00226 
00227     return 0;
00228 }
00229 
00230 static int decode_mv_component(GetBitContext *gb, int v){
00231     int mv_diff = get_vlc2(gb, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
00232 
00233     /* check if mv_diff is valid */
00234     if ( mv_diff < 0 )
00235         return v;
00236 
00237     mv_diff = mvmap[mv_diff];
00238 
00239     if(mv_diff && !get_bits1(gb))
00240         mv_diff= -mv_diff;
00241 
00242     v += mv_diff;
00243     if     (v <=-16) v+= 32;
00244     else if(v >= 16) v-= 32;
00245 
00246     return v;
00247 }
00248 
00249 static int h261_decode_mb(H261Context *h){
00250     MpegEncContext * const s = &h->s;
00251     int i, cbp, xy;
00252 
00253     cbp = 63;
00254     // Read mba
00255     do{
00256         h->mba_diff = get_vlc2(&s->gb, h261_mba_vlc.table, H261_MBA_VLC_BITS, 2);
00257 
00258         /* Check for slice end */
00259         /* NOTE: GOB can be empty (no MB data) or exist only of MBA_stuffing */
00260         if (h->mba_diff == MBA_STARTCODE){ // start code
00261             h->gob_start_code_skipped = 1;
00262             return SLICE_END;
00263         }
00264     }
00265     while( h->mba_diff == MBA_STUFFING ); // stuffing
00266 
00267     if ( h->mba_diff < 0 ){
00268         if ( get_bits_count(&s->gb) + 7 >= s->gb.size_in_bits )
00269             return SLICE_END;
00270 
00271         av_log(s->avctx, AV_LOG_ERROR, "illegal mba at %d %d\n", s->mb_x, s->mb_y);
00272         return SLICE_ERROR;
00273     }
00274 
00275     h->mba_diff += 1;
00276     h->current_mba += h->mba_diff;
00277 
00278     if ( h->current_mba > MBA_STUFFING )
00279         return SLICE_ERROR;
00280 
00281     s->mb_x= ((h->gob_number-1) % 2) * 11 + ((h->current_mba-1) % 11);
00282     s->mb_y= ((h->gob_number-1) / 2) * 3 + ((h->current_mba-1) / 11);
00283     xy = s->mb_x + s->mb_y * s->mb_stride;
00284     ff_init_block_index(s);
00285     ff_update_block_index(s);
00286 
00287     // Read mtype
00288     h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
00289     h->mtype = h261_mtype_map[h->mtype];
00290 
00291     // Read mquant
00292     if ( IS_QUANT ( h->mtype ) ){
00293         ff_set_qscale(s, get_bits(&s->gb, 5));
00294     }
00295 
00296     s->mb_intra = IS_INTRA4x4(h->mtype);
00297 
00298     // Read mv
00299     if ( IS_16X16 ( h->mtype ) ){
00300         // Motion vector data is included for all MC macroblocks. MVD is obtained from the macroblock vector by subtracting the
00301         // vector of the preceding macroblock. For this calculation the vector of the preceding macroblock is regarded as zero in the
00302         // following three situations:
00303         // 1) evaluating MVD for macroblocks 1, 12 and 23;
00304         // 2) evaluating MVD for macroblocks in which MBA does not represent a difference of 1;
00305         // 3) MTYPE of the previous macroblock was not MC.
00306         if ( ( h->current_mba == 1 ) || ( h->current_mba == 12 ) || ( h->current_mba == 23 ) ||
00307              ( h->mba_diff != 1))
00308         {
00309             h->current_mv_x = 0;
00310             h->current_mv_y = 0;
00311         }
00312 
00313         h->current_mv_x= decode_mv_component(&s->gb, h->current_mv_x);
00314         h->current_mv_y= decode_mv_component(&s->gb, h->current_mv_y);
00315     }else{
00316         h->current_mv_x = 0;
00317         h->current_mv_y = 0;
00318     }
00319 
00320     // Read cbp
00321     if ( HAS_CBP( h->mtype ) ){
00322         cbp = get_vlc2(&s->gb, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 2) + 1;
00323     }
00324 
00325     if(s->mb_intra){
00326         s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
00327         goto intra;
00328     }
00329 
00330     //set motion vectors
00331     s->mv_dir = MV_DIR_FORWARD;
00332     s->mv_type = MV_TYPE_16X16;
00333     s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
00334     s->mv[0][0][0] = h->current_mv_x * 2;//gets divided by 2 in motion compensation
00335     s->mv[0][0][1] = h->current_mv_y * 2;
00336 
00337 intra:
00338     /* decode each block */
00339     if(s->mb_intra || HAS_CBP(h->mtype)){
00340         s->dsp.clear_blocks(s->block[0]);
00341         for (i = 0; i < 6; i++) {
00342             if (h261_decode_block(h, s->block[i], i, cbp&32) < 0){
00343                 return SLICE_ERROR;
00344             }
00345             cbp+=cbp;
00346         }
00347     }else{
00348         for (i = 0; i < 6; i++)
00349             s->block_last_index[i]= -1;
00350     }
00351 
00352     MPV_decode_mb(s, s->block);
00353 
00354     return SLICE_OK;
00355 }
00356 
00361 static int h261_decode_block(H261Context * h, DCTELEM * block,
00362                              int n, int coded)
00363 {
00364     MpegEncContext * const s = &h->s;
00365     int code, level, i, j, run;
00366     RLTable *rl = &h261_rl_tcoeff;
00367     const uint8_t *scan_table;
00368 
00369     // For the variable length encoding there are two code tables, one being used for
00370     // the first transmitted LEVEL in INTER, INTER+MC and INTER+MC+FIL blocks, the second
00371     // for all other LEVELs except the first one in INTRA blocks which is fixed length
00372     // coded with 8 bits.
00373     // NOTE: the two code tables only differ in one VLC so we handle that manually.
00374     scan_table = s->intra_scantable.permutated;
00375     if (s->mb_intra){
00376         /* DC coef */
00377         level = get_bits(&s->gb, 8);
00378         // 0 (00000000b) and -128 (10000000b) are FORBIDDEN
00379         if((level&0x7F) == 0){
00380             av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
00381             return -1;
00382         }
00383         // The code 1000 0000 is not used, the reconstruction level of 1024 being coded as 1111 1111.
00384         if (level == 255)
00385             level = 128;
00386         block[0] = level;
00387         i = 1;
00388     }else if(coded){
00389         // Run  Level   Code
00390         // EOB                  Not possible for first level when cbp is available (that's why the table is different)
00391         // 0    1               1s
00392         // *    *               0*
00393         int check = show_bits(&s->gb, 2);
00394         i = 0;
00395         if ( check & 0x2 ){
00396             skip_bits(&s->gb, 2);
00397             block[0] = ( check & 0x1 ) ? -1 : 1;
00398             i = 1;
00399         }
00400     }else{
00401         i = 0;
00402     }
00403     if(!coded){
00404         s->block_last_index[n] = i - 1;
00405         return 0;
00406     }
00407     for(;;){
00408         code = get_vlc2(&s->gb, rl->vlc.table, TCOEFF_VLC_BITS, 2);
00409         if (code < 0){
00410             av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
00411             return -1;
00412         }
00413         if (code == rl->n) {
00414             /* escape */
00415             // The remaining combinations of (run, level) are encoded with a 20-bit word consisting of 6 bits escape, 6 bits run and 8 bits level.
00416             run = get_bits(&s->gb, 6);
00417             level = get_sbits(&s->gb, 8);
00418         }else if(code == 0){
00419             break;
00420         }else{
00421             run = rl->table_run[code];
00422             level = rl->table_level[code];
00423             if (get_bits1(&s->gb))
00424                 level = -level;
00425         }
00426         i += run;
00427         if (i >= 64){
00428             av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d\n", s->mb_x, s->mb_y);
00429             return -1;
00430         }
00431         j = scan_table[i];
00432         block[j] = level;
00433         i++;
00434     }
00435     s->block_last_index[n] = i-1;
00436     return 0;
00437 }
00438 
00443 static int h261_decode_picture_header(H261Context *h){
00444     MpegEncContext * const s = &h->s;
00445     int format, i;
00446     uint32_t startcode= 0;
00447 
00448     for(i= get_bits_left(&s->gb); i>24; i-=1){
00449         startcode = ((startcode << 1) | get_bits(&s->gb, 1)) & 0x000FFFFF;
00450 
00451         if(startcode == 0x10)
00452             break;
00453     }
00454 
00455     if (startcode != 0x10){
00456         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
00457         return -1;
00458     }
00459 
00460     /* temporal reference */
00461     i= get_bits(&s->gb, 5); /* picture timestamp */
00462     if(i < (s->picture_number&31))
00463         i += 32;
00464     s->picture_number = (s->picture_number&~31) + i;
00465 
00466     s->avctx->time_base= (AVRational){1001, 30000};
00467     s->current_picture.pts= s->picture_number;
00468 
00469 
00470     /* PTYPE starts here */
00471     skip_bits1(&s->gb); /* split screen off */
00472     skip_bits1(&s->gb); /* camera  off */
00473     skip_bits1(&s->gb); /* freeze picture release off */
00474 
00475     format = get_bits1(&s->gb);
00476 
00477     //only 2 formats possible
00478     if (format == 0){//QCIF
00479         s->width = 176;
00480         s->height = 144;
00481         s->mb_width = 11;
00482         s->mb_height = 9;
00483     }else{//CIF
00484         s->width = 352;
00485         s->height = 288;
00486         s->mb_width = 22;
00487         s->mb_height = 18;
00488     }
00489 
00490     s->mb_num = s->mb_width * s->mb_height;
00491 
00492     skip_bits1(&s->gb); /* still image mode off */
00493     skip_bits1(&s->gb); /* Reserved */
00494 
00495     /* PEI */
00496     while (get_bits1(&s->gb) != 0){
00497         skip_bits(&s->gb, 8);
00498     }
00499 
00500     // h261 has no I-FRAMES, but if we pass FF_I_TYPE for the first frame, the codec crashes if it does
00501     // not contain all I-blocks (e.g. when a packet is lost)
00502     s->pict_type = FF_P_TYPE;
00503 
00504     h->gob_number = 0;
00505     return 0;
00506 }
00507 
00508 static int h261_decode_gob(H261Context *h){
00509     MpegEncContext * const s = &h->s;
00510 
00511     ff_set_qscale(s, s->qscale);
00512 
00513     /* decode mb's */
00514     while(h->current_mba <= MBA_STUFFING)
00515     {
00516         int ret;
00517         /* DCT & quantize */
00518         ret= h261_decode_mb(h);
00519         if(ret<0){
00520             if(ret==SLICE_END){
00521                 h261_decode_mb_skipped(h, h->current_mba, 33);
00522                 return 0;
00523             }
00524             av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", s->mb_x + s->mb_y*s->mb_stride);
00525             return -1;
00526         }
00527 
00528         h261_decode_mb_skipped(h, h->current_mba-h->mba_diff, h->current_mba-1);
00529     }
00530 
00531     return -1;
00532 }
00533 
00537 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
00538     int pos= get_bits_count(&s->gb)>>3;
00539     if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
00540     if(pos+10>buf_size) pos=buf_size; // oops ;)
00541 
00542     return pos;
00543 }
00544 
00545 static int h261_decode_frame(AVCodecContext *avctx,
00546                              void *data, int *data_size,
00547                              AVPacket *avpkt)
00548 {
00549     const uint8_t *buf = avpkt->data;
00550     int buf_size = avpkt->size;
00551     H261Context *h= avctx->priv_data;
00552     MpegEncContext *s = &h->s;
00553     int ret;
00554     AVFrame *pict = data;
00555 
00556     dprintf(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
00557     dprintf(avctx, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
00558     s->flags= avctx->flags;
00559     s->flags2= avctx->flags2;
00560 
00561     h->gob_start_code_skipped=0;
00562 
00563 retry:
00564 
00565     init_get_bits(&s->gb, buf, buf_size*8);
00566 
00567     if(!s->context_initialized){
00568         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
00569             return -1;
00570     }
00571 
00572     //we need to set current_picture_ptr before reading the header, otherwise we cannot store anyting im there
00573     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
00574         int i= ff_find_unused_picture(s, 0);
00575         s->current_picture_ptr= &s->picture[i];
00576     }
00577 
00578     ret = h261_decode_picture_header(h);
00579 
00580     /* skip if the header was thrashed */
00581     if (ret < 0){
00582         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
00583         return -1;
00584     }
00585 
00586     if (s->width != avctx->coded_width || s->height != avctx->coded_height){
00587         ParseContext pc= s->parse_context; //FIXME move this demuxing hack to libavformat
00588         s->parse_context.buffer=0;
00589         MPV_common_end(s);
00590         s->parse_context= pc;
00591     }
00592     if (!s->context_initialized) {
00593         avcodec_set_dimensions(avctx, s->width, s->height);
00594 
00595         goto retry;
00596     }
00597 
00598     // for hurry_up==5
00599     s->current_picture.pict_type= s->pict_type;
00600     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
00601 
00602     /* skip everything if we are in a hurry>=5 */
00603     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
00604     if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
00605        ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
00606        || avctx->skip_frame >= AVDISCARD_ALL)
00607         return get_consumed_bytes(s, buf_size);
00608 
00609     if(MPV_frame_start(s, avctx) < 0)
00610         return -1;
00611 
00612     ff_er_frame_start(s);
00613 
00614     /* decode each macroblock */
00615     s->mb_x=0;
00616     s->mb_y=0;
00617 
00618     while(h->gob_number < (s->mb_height==18 ? 12 : 5)){
00619         if(ff_h261_resync(h)<0)
00620             break;
00621         h261_decode_gob(h);
00622     }
00623     MPV_frame_end(s);
00624 
00625 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
00626 assert(s->current_picture.pict_type == s->pict_type);
00627     *pict= *(AVFrame*)s->current_picture_ptr;
00628     ff_print_debug_info(s, pict);
00629 
00630     *data_size = sizeof(AVFrame);
00631 
00632     return get_consumed_bytes(s, buf_size);
00633 }
00634 
00635 static av_cold int h261_decode_end(AVCodecContext *avctx)
00636 {
00637     H261Context *h= avctx->priv_data;
00638     MpegEncContext *s = &h->s;
00639 
00640     MPV_common_end(s);
00641     return 0;
00642 }
00643 
00644 AVCodec h261_decoder = {
00645     "h261",
00646     AVMEDIA_TYPE_VIDEO,
00647     CODEC_ID_H261,
00648     sizeof(H261Context),
00649     h261_decode_init,
00650     NULL,
00651     h261_decode_end,
00652     h261_decode_frame,
00653     CODEC_CAP_DR1,
00654     .long_name = NULL_IF_CONFIG_SMALL("H.261"),
00655 };

Generated on Fri Sep 16 2011 17:17:36 for FFmpeg by  doxygen 1.7.1