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libavcodec/mpeg12.c

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00001 /*
00002  * MPEG-1/2 decoder
00003  * Copyright (c) 2000,2001 Fabrice Bellard
00004  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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 //#define DEBUG
00029 #include "internal.h"
00030 #include "avcodec.h"
00031 #include "dsputil.h"
00032 #include "mpegvideo.h"
00033 #include "libavutil/avassert.h"
00034 
00035 #include "mpeg12.h"
00036 #include "mpeg12data.h"
00037 #include "mpeg12decdata.h"
00038 #include "bytestream.h"
00039 #include "vdpau_internal.h"
00040 #include "xvmc_internal.h"
00041 #include "thread.h"
00042 
00043 //#undef NDEBUG
00044 //#include <assert.h>
00045 
00046 
00047 #define MV_VLC_BITS 9
00048 #define MBINCR_VLC_BITS 9
00049 #define MB_PAT_VLC_BITS 9
00050 #define MB_PTYPE_VLC_BITS 6
00051 #define MB_BTYPE_VLC_BITS 6
00052 
00053 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
00054                               DCTELEM *block,
00055                               int n);
00056 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
00057                               DCTELEM *block,
00058                               int n);
00059 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
00060 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
00061                                         DCTELEM *block,
00062                                         int n);
00063 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
00064                                     DCTELEM *block,
00065                                     int n);
00066 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
00067 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
00068 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
00069 static void exchange_uv(MpegEncContext *s);
00070 
00071 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
00072 
00073 
00074 #define INIT_2D_VLC_RL(rl, static_size)\
00075 {\
00076     static RL_VLC_ELEM rl_vlc_table[static_size];\
00077     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
00078              &rl.table_vlc[0][1], 4, 2,\
00079              &rl.table_vlc[0][0], 4, 2, static_size);\
00080 \
00081     rl.rl_vlc[0]= rl_vlc_table;\
00082     init_2d_vlc_rl(&rl);\
00083 }
00084 
00085 static void init_2d_vlc_rl(RLTable *rl)
00086 {
00087     int i;
00088 
00089     for(i=0; i<rl->vlc.table_size; i++){
00090         int code= rl->vlc.table[i][0];
00091         int len = rl->vlc.table[i][1];
00092         int level, run;
00093 
00094         if(len==0){ // illegal code
00095             run= 65;
00096             level= MAX_LEVEL;
00097         }else if(len<0){ //more bits needed
00098             run= 0;
00099             level= code;
00100         }else{
00101             if(code==rl->n){ //esc
00102                 run= 65;
00103                 level= 0;
00104             }else if(code==rl->n+1){ //eob
00105                 run= 0;
00106                 level= 127;
00107             }else{
00108                 run=   rl->table_run  [code] + 1;
00109                 level= rl->table_level[code];
00110             }
00111         }
00112         rl->rl_vlc[0][i].len= len;
00113         rl->rl_vlc[0][i].level= level;
00114         rl->rl_vlc[0][i].run= run;
00115     }
00116 }
00117 
00118 void ff_mpeg12_common_init(MpegEncContext *s)
00119 {
00120 
00121     s->y_dc_scale_table=
00122     s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
00123 
00124 }
00125 
00126 void ff_mpeg1_clean_buffers(MpegEncContext *s){
00127     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
00128     s->last_dc[1] = s->last_dc[0];
00129     s->last_dc[2] = s->last_dc[0];
00130     memset(s->last_mv, 0, sizeof(s->last_mv));
00131 }
00132 
00133 
00134 /******************************************/
00135 /* decoding */
00136 
00137 VLC ff_dc_lum_vlc;
00138 VLC ff_dc_chroma_vlc;
00139 
00140 static VLC mv_vlc;
00141 static VLC mbincr_vlc;
00142 static VLC mb_ptype_vlc;
00143 static VLC mb_btype_vlc;
00144 static VLC mb_pat_vlc;
00145 
00146 av_cold void ff_mpeg12_init_vlcs(void)
00147 {
00148     static int done = 0;
00149 
00150     if (!done) {
00151         done = 1;
00152 
00153         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
00154                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
00155                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
00156         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
00157                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
00158                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
00159         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
00160                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
00161                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
00162         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
00163                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
00164                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
00165         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
00166                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
00167                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
00168 
00169         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
00170                  &table_mb_ptype[0][1], 2, 1,
00171                  &table_mb_ptype[0][0], 2, 1, 64);
00172         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
00173                  &table_mb_btype[0][1], 2, 1,
00174                  &table_mb_btype[0][0], 2, 1, 64);
00175         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
00176         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
00177 
00178         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
00179         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
00180     }
00181 }
00182 
00183 static inline int get_dmv(MpegEncContext *s)
00184 {
00185     if(get_bits1(&s->gb))
00186         return 1 - (get_bits1(&s->gb) << 1);
00187     else
00188         return 0;
00189 }
00190 
00191 static inline int get_qscale(MpegEncContext *s)
00192 {
00193     int qscale = get_bits(&s->gb, 5);
00194     if (s->q_scale_type) {
00195         return non_linear_qscale[qscale];
00196     } else {
00197         return qscale << 1;
00198     }
00199 }
00200 
00201 /* motion type (for MPEG-2) */
00202 #define MT_FIELD 1
00203 #define MT_FRAME 2
00204 #define MT_16X8  2
00205 #define MT_DMV   3
00206 
00207 static int mpeg_decode_mb(MpegEncContext *s,
00208                           DCTELEM block[12][64])
00209 {
00210     int i, j, k, cbp, val, mb_type, motion_type;
00211     const int mb_block_count = 4 + (1<< s->chroma_format);
00212 
00213     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
00214 
00215     assert(s->mb_skipped==0);
00216 
00217     if (s->mb_skip_run-- != 0) {
00218         if (s->pict_type == AV_PICTURE_TYPE_P) {
00219             s->mb_skipped = 1;
00220             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
00221         } else {
00222             int mb_type;
00223 
00224             if(s->mb_x)
00225                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
00226             else
00227                 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
00228             if(IS_INTRA(mb_type))
00229                 return -1;
00230 
00231             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
00232                 mb_type | MB_TYPE_SKIP;
00233 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
00234 
00235             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
00236                 s->mb_skipped = 1;
00237         }
00238 
00239         return 0;
00240     }
00241 
00242     switch(s->pict_type) {
00243     default:
00244     case AV_PICTURE_TYPE_I:
00245         if (get_bits1(&s->gb) == 0) {
00246             if (get_bits1(&s->gb) == 0){
00247                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
00248                 return -1;
00249             }
00250             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
00251         } else {
00252             mb_type = MB_TYPE_INTRA;
00253         }
00254         break;
00255     case AV_PICTURE_TYPE_P:
00256         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
00257         if (mb_type < 0){
00258             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
00259             return -1;
00260         }
00261         mb_type = ptype2mb_type[ mb_type ];
00262         break;
00263     case AV_PICTURE_TYPE_B:
00264         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
00265         if (mb_type < 0){
00266             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
00267             return -1;
00268         }
00269         mb_type = btype2mb_type[ mb_type ];
00270         break;
00271     }
00272     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
00273 //    motion_type = 0; /* avoid warning */
00274     if (IS_INTRA(mb_type)) {
00275         s->dsp.clear_blocks(s->block[0]);
00276 
00277         if(!s->chroma_y_shift){
00278             s->dsp.clear_blocks(s->block[6]);
00279         }
00280 
00281         /* compute DCT type */
00282         if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
00283             !s->frame_pred_frame_dct) {
00284             s->interlaced_dct = get_bits1(&s->gb);
00285         }
00286 
00287         if (IS_QUANT(mb_type))
00288             s->qscale = get_qscale(s);
00289 
00290         if (s->concealment_motion_vectors) {
00291             /* just parse them */
00292             if (s->picture_structure != PICT_FRAME)
00293                 skip_bits1(&s->gb); /* field select */
00294 
00295             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
00296                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
00297             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
00298                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
00299 
00300             skip_bits1(&s->gb); /* marker */
00301         }else
00302             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
00303         s->mb_intra = 1;
00304         //if 1, we memcpy blocks in xvmcvideo
00305         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
00306             ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
00307             if(s->swap_uv){
00308                 exchange_uv(s);
00309             }
00310         }
00311 
00312         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
00313             if(s->flags2 & CODEC_FLAG2_FAST){
00314                 for(i=0;i<6;i++) {
00315                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
00316                 }
00317             }else{
00318                 for(i=0;i<mb_block_count;i++) {
00319                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
00320                         return -1;
00321                 }
00322             }
00323         } else {
00324             for(i=0;i<6;i++) {
00325                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
00326                     return -1;
00327             }
00328         }
00329     } else {
00330         if (mb_type & MB_TYPE_ZERO_MV){
00331             assert(mb_type & MB_TYPE_CBP);
00332 
00333             s->mv_dir = MV_DIR_FORWARD;
00334             if(s->picture_structure == PICT_FRAME){
00335                 if(!s->frame_pred_frame_dct)
00336                     s->interlaced_dct = get_bits1(&s->gb);
00337                 s->mv_type = MV_TYPE_16X16;
00338             }else{
00339                 s->mv_type = MV_TYPE_FIELD;
00340                 mb_type |= MB_TYPE_INTERLACED;
00341                 s->field_select[0][0]= s->picture_structure - 1;
00342             }
00343 
00344             if (IS_QUANT(mb_type))
00345                 s->qscale = get_qscale(s);
00346 
00347             s->last_mv[0][0][0] = 0;
00348             s->last_mv[0][0][1] = 0;
00349             s->last_mv[0][1][0] = 0;
00350             s->last_mv[0][1][1] = 0;
00351             s->mv[0][0][0] = 0;
00352             s->mv[0][0][1] = 0;
00353         }else{
00354             assert(mb_type & MB_TYPE_L0L1);
00355 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
00356             /* get additional motion vector type */
00357             if (s->frame_pred_frame_dct)
00358                 motion_type = MT_FRAME;
00359             else{
00360                 motion_type = get_bits(&s->gb, 2);
00361                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
00362                     s->interlaced_dct = get_bits1(&s->gb);
00363             }
00364 
00365             if (IS_QUANT(mb_type))
00366                 s->qscale = get_qscale(s);
00367 
00368             /* motion vectors */
00369             s->mv_dir= (mb_type>>13)&3;
00370             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
00371             switch(motion_type) {
00372             case MT_FRAME: /* or MT_16X8 */
00373                 if (s->picture_structure == PICT_FRAME) {
00374                     mb_type |= MB_TYPE_16x16;
00375                     s->mv_type = MV_TYPE_16X16;
00376                     for(i=0;i<2;i++) {
00377                         if (USES_LIST(mb_type, i)) {
00378                             /* MT_FRAME */
00379                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
00380                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
00381                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
00382                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
00383                             /* full_pel: only for MPEG-1 */
00384                             if (s->full_pel[i]){
00385                                 s->mv[i][0][0] <<= 1;
00386                                 s->mv[i][0][1] <<= 1;
00387                             }
00388                         }
00389                     }
00390                 } else {
00391                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
00392                     s->mv_type = MV_TYPE_16X8;
00393                     for(i=0;i<2;i++) {
00394                         if (USES_LIST(mb_type, i)) {
00395                             /* MT_16X8 */
00396                             for(j=0;j<2;j++) {
00397                                 s->field_select[i][j] = get_bits1(&s->gb);
00398                                 for(k=0;k<2;k++) {
00399                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
00400                                                              s->last_mv[i][j][k]);
00401                                     s->last_mv[i][j][k] = val;
00402                                     s->mv[i][j][k] = val;
00403                                 }
00404                             }
00405                         }
00406                     }
00407                 }
00408                 break;
00409             case MT_FIELD:
00410                 if(s->progressive_sequence){
00411                     av_log(s->avctx, AV_LOG_ERROR, "MT_FIELD in progressive_sequence\n");
00412                     return -1;
00413                 }
00414                 s->mv_type = MV_TYPE_FIELD;
00415                 if (s->picture_structure == PICT_FRAME) {
00416                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
00417                     for(i=0;i<2;i++) {
00418                         if (USES_LIST(mb_type, i)) {
00419                             for(j=0;j<2;j++) {
00420                                 s->field_select[i][j] = get_bits1(&s->gb);
00421                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
00422                                                          s->last_mv[i][j][0]);
00423                                 s->last_mv[i][j][0] = val;
00424                                 s->mv[i][j][0] = val;
00425                                 av_dlog(s->avctx, "fmx=%d\n", val);
00426                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
00427                                                          s->last_mv[i][j][1] >> 1);
00428                                 s->last_mv[i][j][1] = val << 1;
00429                                 s->mv[i][j][1] = val;
00430                                 av_dlog(s->avctx, "fmy=%d\n", val);
00431                             }
00432                         }
00433                     }
00434                 } else {
00435                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
00436                     for(i=0;i<2;i++) {
00437                         if (USES_LIST(mb_type, i)) {
00438                             s->field_select[i][0] = get_bits1(&s->gb);
00439                             for(k=0;k<2;k++) {
00440                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
00441                                                          s->last_mv[i][0][k]);
00442                                 s->last_mv[i][0][k] = val;
00443                                 s->last_mv[i][1][k] = val;
00444                                 s->mv[i][0][k] = val;
00445                             }
00446                         }
00447                     }
00448                 }
00449                 break;
00450             case MT_DMV:
00451                 if(s->progressive_sequence){
00452                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
00453                     return -1;
00454                 }
00455                 s->mv_type = MV_TYPE_DMV;
00456                 for(i=0;i<2;i++) {
00457                     if (USES_LIST(mb_type, i)) {
00458                         int dmx, dmy, mx, my, m;
00459                         const int my_shift= s->picture_structure == PICT_FRAME;
00460 
00461                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
00462                                                 s->last_mv[i][0][0]);
00463                         s->last_mv[i][0][0] = mx;
00464                         s->last_mv[i][1][0] = mx;
00465                         dmx = get_dmv(s);
00466                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
00467                                                 s->last_mv[i][0][1] >> my_shift);
00468                         dmy = get_dmv(s);
00469 
00470 
00471                         s->last_mv[i][0][1] = my<<my_shift;
00472                         s->last_mv[i][1][1] = my<<my_shift;
00473 
00474                         s->mv[i][0][0] = mx;
00475                         s->mv[i][0][1] = my;
00476                         s->mv[i][1][0] = mx;//not used
00477                         s->mv[i][1][1] = my;//not used
00478 
00479                         if (s->picture_structure == PICT_FRAME) {
00480                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
00481 
00482                             //m = 1 + 2 * s->top_field_first;
00483                             m = s->top_field_first ? 1 : 3;
00484 
00485                             /* top -> top pred */
00486                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
00487                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
00488                             m = 4 - m;
00489                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
00490                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
00491                         } else {
00492                             mb_type |= MB_TYPE_16x16;
00493 
00494                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
00495                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
00496                             if(s->picture_structure == PICT_TOP_FIELD)
00497                                 s->mv[i][2][1]--;
00498                             else
00499                                 s->mv[i][2][1]++;
00500                         }
00501                     }
00502                 }
00503                 break;
00504             default:
00505                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
00506                 return -1;
00507             }
00508         }
00509 
00510         s->mb_intra = 0;
00511         if (HAS_CBP(mb_type)) {
00512             s->dsp.clear_blocks(s->block[0]);
00513 
00514             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
00515             if(mb_block_count > 6){
00516                  cbp<<= mb_block_count-6;
00517                  cbp |= get_bits(&s->gb, mb_block_count-6);
00518                  s->dsp.clear_blocks(s->block[6]);
00519             }
00520             if (cbp <= 0){
00521                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
00522                 return -1;
00523             }
00524 
00525             //if 1, we memcpy blocks in xvmcvideo
00526             if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
00527                 ff_xvmc_pack_pblocks(s,cbp);
00528                 if(s->swap_uv){
00529                     exchange_uv(s);
00530                 }
00531             }
00532 
00533             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
00534                 if(s->flags2 & CODEC_FLAG2_FAST){
00535                     for(i=0;i<6;i++) {
00536                         if(cbp & 32) {
00537                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
00538                         } else {
00539                             s->block_last_index[i] = -1;
00540                         }
00541                         cbp+=cbp;
00542                     }
00543                 }else{
00544                     cbp<<= 12-mb_block_count;
00545 
00546                     for(i=0;i<mb_block_count;i++) {
00547                         if ( cbp & (1<<11) ) {
00548                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
00549                                 return -1;
00550                         } else {
00551                             s->block_last_index[i] = -1;
00552                         }
00553                         cbp+=cbp;
00554                     }
00555                 }
00556             } else {
00557                 if(s->flags2 & CODEC_FLAG2_FAST){
00558                     for(i=0;i<6;i++) {
00559                         if (cbp & 32) {
00560                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
00561                         } else {
00562                             s->block_last_index[i] = -1;
00563                         }
00564                         cbp+=cbp;
00565                     }
00566                 }else{
00567                     for(i=0;i<6;i++) {
00568                         if (cbp & 32) {
00569                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
00570                                 return -1;
00571                         } else {
00572                             s->block_last_index[i] = -1;
00573                         }
00574                         cbp+=cbp;
00575                     }
00576                 }
00577             }
00578         }else{
00579             for(i=0;i<12;i++)
00580                 s->block_last_index[i] = -1;
00581         }
00582     }
00583 
00584     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
00585 
00586     return 0;
00587 }
00588 
00589 /* as H.263, but only 17 codes */
00590 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
00591 {
00592     int code, sign, val, l, shift;
00593 
00594     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
00595     if (code == 0) {
00596         return pred;
00597     }
00598     if (code < 0) {
00599         return 0xffff;
00600     }
00601 
00602     sign = get_bits1(&s->gb);
00603     shift = fcode - 1;
00604     val = code;
00605     if (shift) {
00606         val = (val - 1) << shift;
00607         val |= get_bits(&s->gb, shift);
00608         val++;
00609     }
00610     if (sign)
00611         val = -val;
00612     val += pred;
00613 
00614     /* modulo decoding */
00615     l= INT_BIT - 5 - shift;
00616     val = (val<<l)>>l;
00617     return val;
00618 }
00619 
00620 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
00621                                DCTELEM *block,
00622                                int n)
00623 {
00624     int level, dc, diff, i, j, run;
00625     int component;
00626     RLTable *rl = &ff_rl_mpeg1;
00627     uint8_t * const scantable= s->intra_scantable.permutated;
00628     const uint16_t *quant_matrix= s->intra_matrix;
00629     const int qscale= s->qscale;
00630 
00631     /* DC coefficient */
00632     component = (n <= 3 ? 0 : n - 4 + 1);
00633     diff = decode_dc(&s->gb, component);
00634     if (diff >= 0xffff)
00635         return -1;
00636     dc = s->last_dc[component];
00637     dc += diff;
00638     s->last_dc[component] = dc;
00639     block[0] = dc*quant_matrix[0];
00640     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
00641     i = 0;
00642     {
00643         OPEN_READER(re, &s->gb);
00644         /* now quantify & encode AC coefficients */
00645         for(;;) {
00646             UPDATE_CACHE(re, &s->gb);
00647             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
00648 
00649             if(level == 127){
00650                 break;
00651             } else if(level != 0) {
00652                 i += run;
00653                 j = scantable[i];
00654                 level= (level*qscale*quant_matrix[j])>>4;
00655                 level= (level-1)|1;
00656                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
00657                 LAST_SKIP_BITS(re, &s->gb, 1);
00658             } else {
00659                 /* escape */
00660                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
00661                 UPDATE_CACHE(re, &s->gb);
00662                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
00663                 if (level == -128) {
00664                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
00665                 } else if (level == 0) {
00666                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
00667                 }
00668                 i += run;
00669                 j = scantable[i];
00670                 if(level<0){
00671                     level= -level;
00672                     level= (level*qscale*quant_matrix[j])>>4;
00673                     level= (level-1)|1;
00674                     level= -level;
00675                 }else{
00676                     level= (level*qscale*quant_matrix[j])>>4;
00677                     level= (level-1)|1;
00678                 }
00679             }
00680             if (i > 63){
00681                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
00682                 return -1;
00683             }
00684 
00685             block[j] = level;
00686         }
00687         CLOSE_READER(re, &s->gb);
00688     }
00689     s->block_last_index[n] = i;
00690    return 0;
00691 }
00692 
00693 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
00694                                 DCTELEM *block,
00695                                 int n)
00696 {
00697     return mpeg1_decode_block_intra(s, block, n);
00698 }
00699 
00700 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
00701                                DCTELEM *block,
00702                                int n)
00703 {
00704     int level, i, j, run;
00705     RLTable *rl = &ff_rl_mpeg1;
00706     uint8_t * const scantable= s->intra_scantable.permutated;
00707     const uint16_t *quant_matrix= s->inter_matrix;
00708     const int qscale= s->qscale;
00709 
00710     {
00711         OPEN_READER(re, &s->gb);
00712         i = -1;
00713         // special case for first coefficient, no need to add second VLC table
00714         UPDATE_CACHE(re, &s->gb);
00715         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
00716             level= (3*qscale*quant_matrix[0])>>5;
00717             level= (level-1)|1;
00718             if(GET_CACHE(re, &s->gb)&0x40000000)
00719                 level= -level;
00720             block[0] = level;
00721             i++;
00722             SKIP_BITS(re, &s->gb, 2);
00723             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00724                 goto end;
00725         }
00726         /* now quantify & encode AC coefficients */
00727         for(;;) {
00728             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
00729 
00730             if(level != 0) {
00731                 i += run;
00732                 j = scantable[i];
00733                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
00734                 level= (level-1)|1;
00735                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
00736                 SKIP_BITS(re, &s->gb, 1);
00737             } else {
00738                 /* escape */
00739                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
00740                 UPDATE_CACHE(re, &s->gb);
00741                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
00742                 if (level == -128) {
00743                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
00744                 } else if (level == 0) {
00745                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
00746                 }
00747                 i += run;
00748                 j = scantable[i];
00749                 if(level<0){
00750                     level= -level;
00751                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
00752                     level= (level-1)|1;
00753                     level= -level;
00754                 }else{
00755                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
00756                     level= (level-1)|1;
00757                 }
00758             }
00759             if (i > 63){
00760                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
00761                 return -1;
00762             }
00763 
00764             block[j] = level;
00765             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00766                 break;
00767             UPDATE_CACHE(re, &s->gb);
00768         }
00769 end:
00770         LAST_SKIP_BITS(re, &s->gb, 2);
00771         CLOSE_READER(re, &s->gb);
00772     }
00773     s->block_last_index[n] = i;
00774     return 0;
00775 }
00776 
00777 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
00778 {
00779     int level, i, j, run;
00780     RLTable *rl = &ff_rl_mpeg1;
00781     uint8_t * const scantable= s->intra_scantable.permutated;
00782     const int qscale= s->qscale;
00783 
00784     {
00785         OPEN_READER(re, &s->gb);
00786         i = -1;
00787         // special case for first coefficient, no need to add second VLC table
00788         UPDATE_CACHE(re, &s->gb);
00789         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
00790             level= (3*qscale)>>1;
00791             level= (level-1)|1;
00792             if(GET_CACHE(re, &s->gb)&0x40000000)
00793                 level= -level;
00794             block[0] = level;
00795             i++;
00796             SKIP_BITS(re, &s->gb, 2);
00797             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00798                 goto end;
00799         }
00800 
00801         /* now quantify & encode AC coefficients */
00802         for(;;) {
00803             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
00804 
00805             if(level != 0) {
00806                 i += run;
00807                 j = scantable[i];
00808                 level= ((level*2+1)*qscale)>>1;
00809                 level= (level-1)|1;
00810                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
00811                 SKIP_BITS(re, &s->gb, 1);
00812             } else {
00813                 /* escape */
00814                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
00815                 UPDATE_CACHE(re, &s->gb);
00816                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
00817                 if (level == -128) {
00818                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
00819                 } else if (level == 0) {
00820                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
00821                 }
00822                 i += run;
00823                 j = scantable[i];
00824                 if(level<0){
00825                     level= -level;
00826                     level= ((level*2+1)*qscale)>>1;
00827                     level= (level-1)|1;
00828                     level= -level;
00829                 }else{
00830                     level= ((level*2+1)*qscale)>>1;
00831                     level= (level-1)|1;
00832                 }
00833             }
00834 
00835             block[j] = level;
00836             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00837                 break;
00838             UPDATE_CACHE(re, &s->gb);
00839         }
00840 end:
00841         LAST_SKIP_BITS(re, &s->gb, 2);
00842         CLOSE_READER(re, &s->gb);
00843     }
00844     s->block_last_index[n] = i;
00845     return 0;
00846 }
00847 
00848 
00849 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
00850                                DCTELEM *block,
00851                                int n)
00852 {
00853     int level, i, j, run;
00854     RLTable *rl = &ff_rl_mpeg1;
00855     uint8_t * const scantable= s->intra_scantable.permutated;
00856     const uint16_t *quant_matrix;
00857     const int qscale= s->qscale;
00858     int mismatch;
00859 
00860     mismatch = 1;
00861 
00862     {
00863         OPEN_READER(re, &s->gb);
00864         i = -1;
00865         if (n < 4)
00866             quant_matrix = s->inter_matrix;
00867         else
00868             quant_matrix = s->chroma_inter_matrix;
00869 
00870         // special case for first coefficient, no need to add second VLC table
00871         UPDATE_CACHE(re, &s->gb);
00872         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
00873             level= (3*qscale*quant_matrix[0])>>5;
00874             if(GET_CACHE(re, &s->gb)&0x40000000)
00875                 level= -level;
00876             block[0] = level;
00877             mismatch ^= level;
00878             i++;
00879             SKIP_BITS(re, &s->gb, 2);
00880             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00881                 goto end;
00882         }
00883 
00884         /* now quantify & encode AC coefficients */
00885         for(;;) {
00886             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
00887 
00888             if(level != 0) {
00889                 i += run;
00890                 j = scantable[i];
00891                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
00892                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
00893                 SKIP_BITS(re, &s->gb, 1);
00894             } else {
00895                 /* escape */
00896                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
00897                 UPDATE_CACHE(re, &s->gb);
00898                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
00899 
00900                 i += run;
00901                 j = scantable[i];
00902                 if(level<0){
00903                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
00904                     level= -level;
00905                 }else{
00906                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
00907                 }
00908             }
00909             if (i > 63){
00910                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
00911                 return -1;
00912             }
00913 
00914             mismatch ^= level;
00915             block[j] = level;
00916             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00917                 break;
00918             UPDATE_CACHE(re, &s->gb);
00919         }
00920 end:
00921         LAST_SKIP_BITS(re, &s->gb, 2);
00922         CLOSE_READER(re, &s->gb);
00923     }
00924     block[63] ^= (mismatch & 1);
00925 
00926     s->block_last_index[n] = i;
00927     return 0;
00928 }
00929 
00930 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
00931                                DCTELEM *block,
00932                                int n)
00933 {
00934     int level, i, j, run;
00935     RLTable *rl = &ff_rl_mpeg1;
00936     uint8_t * const scantable= s->intra_scantable.permutated;
00937     const int qscale= s->qscale;
00938     OPEN_READER(re, &s->gb);
00939     i = -1;
00940 
00941     // special case for first coefficient, no need to add second VLC table
00942     UPDATE_CACHE(re, &s->gb);
00943     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
00944         level= (3*qscale)>>1;
00945         if(GET_CACHE(re, &s->gb)&0x40000000)
00946             level= -level;
00947         block[0] = level;
00948         i++;
00949         SKIP_BITS(re, &s->gb, 2);
00950         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00951             goto end;
00952     }
00953 
00954     /* now quantify & encode AC coefficients */
00955     for(;;) {
00956         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
00957 
00958         if(level != 0) {
00959             i += run;
00960             j = scantable[i];
00961             level= ((level*2+1)*qscale)>>1;
00962             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
00963             SKIP_BITS(re, &s->gb, 1);
00964         } else {
00965             /* escape */
00966             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
00967             UPDATE_CACHE(re, &s->gb);
00968             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
00969 
00970             i += run;
00971             j = scantable[i];
00972             if(level<0){
00973                 level= ((-level*2+1)*qscale)>>1;
00974                 level= -level;
00975             }else{
00976                 level= ((level*2+1)*qscale)>>1;
00977             }
00978         }
00979 
00980         block[j] = level;
00981         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
00982             break;
00983         UPDATE_CACHE(re, &s->gb);
00984     }
00985 end:
00986     LAST_SKIP_BITS(re, &s->gb, 2);
00987     CLOSE_READER(re, &s->gb);
00988     s->block_last_index[n] = i;
00989     return 0;
00990 }
00991 
00992 
00993 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
00994                                DCTELEM *block,
00995                                int n)
00996 {
00997     int level, dc, diff, i, j, run;
00998     int component;
00999     RLTable *rl;
01000     uint8_t * const scantable= s->intra_scantable.permutated;
01001     const uint16_t *quant_matrix;
01002     const int qscale= s->qscale;
01003     int mismatch;
01004 
01005     /* DC coefficient */
01006     if (n < 4){
01007         quant_matrix = s->intra_matrix;
01008         component = 0;
01009     }else{
01010         quant_matrix = s->chroma_intra_matrix;
01011         component = (n&1) + 1;
01012     }
01013     diff = decode_dc(&s->gb, component);
01014     if (diff >= 0xffff)
01015         return -1;
01016     dc = s->last_dc[component];
01017     dc += diff;
01018     s->last_dc[component] = dc;
01019     block[0] = dc << (3 - s->intra_dc_precision);
01020     av_dlog(s->avctx, "dc=%d\n", block[0]);
01021     mismatch = block[0] ^ 1;
01022     i = 0;
01023     if (s->intra_vlc_format)
01024         rl = &ff_rl_mpeg2;
01025     else
01026         rl = &ff_rl_mpeg1;
01027 
01028     {
01029         OPEN_READER(re, &s->gb);
01030         /* now quantify & encode AC coefficients */
01031         for(;;) {
01032             UPDATE_CACHE(re, &s->gb);
01033             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
01034 
01035             if(level == 127){
01036                 break;
01037             } else if(level != 0) {
01038                 i += run;
01039                 j = scantable[i];
01040                 level= (level*qscale*quant_matrix[j])>>4;
01041                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
01042                 LAST_SKIP_BITS(re, &s->gb, 1);
01043             } else {
01044                 /* escape */
01045                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
01046                 UPDATE_CACHE(re, &s->gb);
01047                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
01048                 i += run;
01049                 j = scantable[i];
01050                 if(level<0){
01051                     level= (-level*qscale*quant_matrix[j])>>4;
01052                     level= -level;
01053                 }else{
01054                     level= (level*qscale*quant_matrix[j])>>4;
01055                 }
01056             }
01057             if (i > 63){
01058                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
01059                 return -1;
01060             }
01061 
01062             mismatch^= level;
01063             block[j] = level;
01064         }
01065         CLOSE_READER(re, &s->gb);
01066     }
01067     block[63]^= mismatch&1;
01068 
01069     s->block_last_index[n] = i;
01070     return 0;
01071 }
01072 
01073 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
01074                                DCTELEM *block,
01075                                int n)
01076 {
01077     int level, dc, diff, j, run;
01078     int component;
01079     RLTable *rl;
01080     uint8_t * scantable= s->intra_scantable.permutated;
01081     const uint16_t *quant_matrix;
01082     const int qscale= s->qscale;
01083 
01084     /* DC coefficient */
01085     if (n < 4){
01086         quant_matrix = s->intra_matrix;
01087         component = 0;
01088     }else{
01089         quant_matrix = s->chroma_intra_matrix;
01090         component = (n&1) + 1;
01091     }
01092     diff = decode_dc(&s->gb, component);
01093     if (diff >= 0xffff)
01094         return -1;
01095     dc = s->last_dc[component];
01096     dc += diff;
01097     s->last_dc[component] = dc;
01098     block[0] = dc << (3 - s->intra_dc_precision);
01099     if (s->intra_vlc_format)
01100         rl = &ff_rl_mpeg2;
01101     else
01102         rl = &ff_rl_mpeg1;
01103 
01104     {
01105         OPEN_READER(re, &s->gb);
01106         /* now quantify & encode AC coefficients */
01107         for(;;) {
01108             UPDATE_CACHE(re, &s->gb);
01109             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
01110 
01111             if(level == 127){
01112                 break;
01113             } else if(level != 0) {
01114                 scantable += run;
01115                 j = *scantable;
01116                 level= (level*qscale*quant_matrix[j])>>4;
01117                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
01118                 LAST_SKIP_BITS(re, &s->gb, 1);
01119             } else {
01120                 /* escape */
01121                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
01122                 UPDATE_CACHE(re, &s->gb);
01123                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
01124                 scantable += run;
01125                 j = *scantable;
01126                 if(level<0){
01127                     level= (-level*qscale*quant_matrix[j])>>4;
01128                     level= -level;
01129                 }else{
01130                     level= (level*qscale*quant_matrix[j])>>4;
01131                 }
01132             }
01133 
01134             block[j] = level;
01135         }
01136         CLOSE_READER(re, &s->gb);
01137     }
01138 
01139     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
01140     return 0;
01141 }
01142 
01143 typedef struct Mpeg1Context {
01144     MpegEncContext mpeg_enc_ctx;
01145     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
01146     int repeat_field; /* true if we must repeat the field */
01147     AVPanScan pan_scan;              
01148     int slice_count;
01149     int swap_uv;//indicate VCR2
01150     int save_aspect_info;
01151     int save_width, save_height, save_progressive_seq;
01152     AVRational frame_rate_ext;       
01153     int sync;                        
01154 } Mpeg1Context;
01155 
01156 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
01157 {
01158     Mpeg1Context *s = avctx->priv_data;
01159     MpegEncContext *s2 = &s->mpeg_enc_ctx;
01160     int i;
01161 
01162     /* we need some permutation to store matrices,
01163      * until MPV_common_init() sets the real permutation. */
01164     for(i=0;i<64;i++)
01165        s2->dsp.idct_permutation[i]=i;
01166 
01167     MPV_decode_defaults(s2);
01168 
01169     s->mpeg_enc_ctx.avctx= avctx;
01170     s->mpeg_enc_ctx.flags= avctx->flags;
01171     s->mpeg_enc_ctx.flags2= avctx->flags2;
01172     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
01173     ff_mpeg12_init_vlcs();
01174 
01175     s->mpeg_enc_ctx_allocated = 0;
01176     s->mpeg_enc_ctx.picture_number = 0;
01177     s->repeat_field = 0;
01178     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
01179     avctx->color_range= AVCOL_RANGE_MPEG;
01180     if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
01181         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
01182     else
01183         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
01184     return 0;
01185 }
01186 
01187 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
01188 {
01189     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
01190     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
01191     int err;
01192 
01193     if(avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
01194         return 0;
01195 
01196     err = ff_mpeg_update_thread_context(avctx, avctx_from);
01197     if(err) return err;
01198 
01199     if(!ctx->mpeg_enc_ctx_allocated)
01200         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
01201 
01202     if(!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
01203         s->picture_number++;
01204 
01205     return 0;
01206 }
01207 
01208 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
01209                                      const uint8_t *new_perm){
01210     uint16_t temp_matrix[64];
01211     int i;
01212 
01213     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
01214 
01215     for(i=0;i<64;i++){
01216         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
01217     }
01218 }
01219 
01220 static const enum PixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
01221 #if CONFIG_MPEG_XVMC_DECODER
01222     PIX_FMT_XVMC_MPEG2_IDCT,
01223     PIX_FMT_XVMC_MPEG2_MC,
01224 #endif
01225 #if CONFIG_MPEG1_VDPAU_HWACCEL
01226     PIX_FMT_VDPAU_MPEG1,
01227 #endif
01228     PIX_FMT_YUV420P,
01229     PIX_FMT_NONE
01230 };
01231 
01232 static const enum PixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
01233 #if CONFIG_MPEG_XVMC_DECODER
01234     PIX_FMT_XVMC_MPEG2_IDCT,
01235     PIX_FMT_XVMC_MPEG2_MC,
01236 #endif
01237 #if CONFIG_MPEG2_VDPAU_HWACCEL
01238     PIX_FMT_VDPAU_MPEG2,
01239 #endif
01240 #if CONFIG_MPEG2_DXVA2_HWACCEL
01241     PIX_FMT_DXVA2_VLD,
01242 #endif
01243 #if CONFIG_MPEG2_VAAPI_HWACCEL
01244     PIX_FMT_VAAPI_VLD,
01245 #endif
01246     PIX_FMT_YUV420P,
01247     PIX_FMT_NONE
01248 };
01249 
01250 static inline int uses_vdpau(AVCodecContext *avctx) {
01251     return avctx->pix_fmt == PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == PIX_FMT_VDPAU_MPEG2;
01252 }
01253 
01254 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
01255     Mpeg1Context *s1 = avctx->priv_data;
01256     MpegEncContext *s = &s1->mpeg_enc_ctx;
01257 
01258     if(s->chroma_format < 2) {
01259         enum PixelFormat res;
01260         res = avctx->get_format(avctx,
01261                                 avctx->codec_id == CODEC_ID_MPEG1VIDEO ?
01262                                 mpeg1_hwaccel_pixfmt_list_420 :
01263                                 mpeg2_hwaccel_pixfmt_list_420);
01264         if (res != PIX_FMT_XVMC_MPEG2_IDCT && res != PIX_FMT_XVMC_MPEG2_MC) {
01265             avctx->xvmc_acceleration = 0;
01266         } else if (!avctx->xvmc_acceleration) {
01267             avctx->xvmc_acceleration = 2;
01268         }
01269         return res;
01270     } else if(s->chroma_format == 2)
01271         return PIX_FMT_YUV422P;
01272     else
01273         return PIX_FMT_YUV444P;
01274 }
01275 
01276 /* Call this function when we know all parameters.
01277  * It may be called in different places for MPEG-1 and MPEG-2. */
01278 static int mpeg_decode_postinit(AVCodecContext *avctx){
01279     Mpeg1Context *s1 = avctx->priv_data;
01280     MpegEncContext *s = &s1->mpeg_enc_ctx;
01281     uint8_t old_permutation[64];
01282 
01283     if (
01284         (s1->mpeg_enc_ctx_allocated == 0)||
01285         avctx->coded_width  != s->width ||
01286         avctx->coded_height != s->height||
01287         s1->save_width != s->width ||
01288         s1->save_height != s->height ||
01289         s1->save_aspect_info != s->aspect_ratio_info||
01290         s1->save_progressive_seq != s->progressive_sequence ||
01291         0)
01292     {
01293 
01294         if (s1->mpeg_enc_ctx_allocated) {
01295             ParseContext pc= s->parse_context;
01296             s->parse_context.buffer=0;
01297             MPV_common_end(s);
01298             s->parse_context= pc;
01299         }
01300 
01301         if( (s->width == 0 )||(s->height == 0))
01302             return -2;
01303 
01304         avcodec_set_dimensions(avctx, s->width, s->height);
01305         avctx->bit_rate = s->bit_rate;
01306         s1->save_aspect_info = s->aspect_ratio_info;
01307         s1->save_width = s->width;
01308         s1->save_height = s->height;
01309         s1->save_progressive_seq = s->progressive_sequence;
01310 
01311         /* low_delay may be forced, in this case we will have B-frames
01312          * that behave like P-frames. */
01313         avctx->has_b_frames = !(s->low_delay);
01314 
01315         assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
01316         if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
01317             //MPEG-1 fps
01318             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
01319             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
01320             //MPEG-1 aspect
01321             avctx->sample_aspect_ratio= av_d2q(
01322                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
01323             avctx->ticks_per_frame=1;
01324         }else{//MPEG-2
01325         //MPEG-2 fps
01326             av_reduce(
01327                 &s->avctx->time_base.den,
01328                 &s->avctx->time_base.num,
01329                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
01330                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
01331                 1<<30);
01332             avctx->ticks_per_frame=2;
01333         //MPEG-2 aspect
01334             if(s->aspect_ratio_info > 1){
01335                 AVRational dar =
01336                     av_mul_q(
01337                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
01338                                  (AVRational){s1->pan_scan.width, s1->pan_scan.height}),
01339                         (AVRational){s->width, s->height});
01340 
01341                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
01342                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
01343                 // issue1613, 621, 562
01344                 if((s1->pan_scan.width == 0 ) || (s1->pan_scan.height == 0) ||
01345                    (av_cmp_q(dar,(AVRational){4,3}) && av_cmp_q(dar,(AVRational){16,9}))) {
01346                     s->avctx->sample_aspect_ratio=
01347                         av_div_q(
01348                          ff_mpeg2_aspect[s->aspect_ratio_info],
01349                          (AVRational){s->width, s->height}
01350                          );
01351                 }else{
01352                     s->avctx->sample_aspect_ratio=
01353                         av_div_q(
01354                          ff_mpeg2_aspect[s->aspect_ratio_info],
01355                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
01356                         );
01357 //issue1613 4/3 16/9 -> 16/9
01358 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
01359 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
01360 //                    s->avctx->sample_aspect_ratio= av_mul_q(s->avctx->sample_aspect_ratio, (AVRational){s->width, s->height});
01361 //av_log(NULL, AV_LOG_ERROR, "A %d/%d\n",ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
01362 //av_log(NULL, AV_LOG_ERROR, "B %d/%d\n",s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
01363                 }
01364             }else{
01365                 s->avctx->sample_aspect_ratio=
01366                     ff_mpeg2_aspect[s->aspect_ratio_info];
01367             }
01368         }//MPEG-2
01369 
01370         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
01371         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
01372         //until then pix_fmt may be changed right after codec init
01373         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
01374             avctx->hwaccel )
01375             if( avctx->idct_algo == FF_IDCT_AUTO )
01376                 avctx->idct_algo = FF_IDCT_SIMPLE;
01377 
01378         /* Quantization matrices may need reordering
01379          * if DCT permutation is changed. */
01380         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
01381 
01382         if (MPV_common_init(s) < 0)
01383             return -2;
01384 
01385         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
01386         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
01387         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
01388         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
01389 
01390         s1->mpeg_enc_ctx_allocated = 1;
01391     }
01392     return 0;
01393 }
01394 
01395 static int mpeg1_decode_picture(AVCodecContext *avctx,
01396                                 const uint8_t *buf, int buf_size)
01397 {
01398     Mpeg1Context *s1 = avctx->priv_data;
01399     MpegEncContext *s = &s1->mpeg_enc_ctx;
01400     int ref, f_code, vbv_delay;
01401 
01402     init_get_bits(&s->gb, buf, buf_size*8);
01403 
01404     ref = get_bits(&s->gb, 10); /* temporal ref */
01405     s->pict_type = get_bits(&s->gb, 3);
01406     if(s->pict_type == 0 || s->pict_type > 3)
01407         return -1;
01408 
01409     vbv_delay= get_bits(&s->gb, 16);
01410     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
01411         s->full_pel[0] = get_bits1(&s->gb);
01412         f_code = get_bits(&s->gb, 3);
01413         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
01414             return -1;
01415         s->mpeg_f_code[0][0] = f_code;
01416         s->mpeg_f_code[0][1] = f_code;
01417     }
01418     if (s->pict_type == AV_PICTURE_TYPE_B) {
01419         s->full_pel[1] = get_bits1(&s->gb);
01420         f_code = get_bits(&s->gb, 3);
01421         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
01422             return -1;
01423         s->mpeg_f_code[1][0] = f_code;
01424         s->mpeg_f_code[1][1] = f_code;
01425     }
01426     s->current_picture.pict_type= s->pict_type;
01427     s->current_picture.key_frame= s->pict_type == AV_PICTURE_TYPE_I;
01428 
01429     if(avctx->debug & FF_DEBUG_PICT_INFO)
01430         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
01431 
01432     s->y_dc_scale = 8;
01433     s->c_dc_scale = 8;
01434     return 0;
01435 }
01436 
01437 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
01438 {
01439     MpegEncContext *s= &s1->mpeg_enc_ctx;
01440     int horiz_size_ext, vert_size_ext;
01441     int bit_rate_ext;
01442 
01443     skip_bits(&s->gb, 1); /* profile and level esc*/
01444     s->avctx->profile= get_bits(&s->gb, 3);
01445     s->avctx->level= get_bits(&s->gb, 4);
01446     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
01447     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
01448     horiz_size_ext = get_bits(&s->gb, 2);
01449     vert_size_ext = get_bits(&s->gb, 2);
01450     s->width |= (horiz_size_ext << 12);
01451     s->height |= (vert_size_ext << 12);
01452     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
01453     s->bit_rate += (bit_rate_ext << 18) * 400;
01454     skip_bits1(&s->gb); /* marker */
01455     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
01456 
01457     s->low_delay = get_bits1(&s->gb);
01458     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
01459 
01460     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
01461     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
01462 
01463     av_dlog(s->avctx, "sequence extension\n");
01464     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
01465     s->avctx->sub_id = 2; /* indicates MPEG-2 found */
01466 
01467     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
01468         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
01469                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
01470 
01471 }
01472 
01473 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
01474 {
01475     MpegEncContext *s= &s1->mpeg_enc_ctx;
01476     int color_description, w, h;
01477 
01478     skip_bits(&s->gb, 3); /* video format */
01479     color_description= get_bits1(&s->gb);
01480     if(color_description){
01481         s->avctx->color_primaries= get_bits(&s->gb, 8);
01482         s->avctx->color_trc      = get_bits(&s->gb, 8);
01483         s->avctx->colorspace     = get_bits(&s->gb, 8);
01484     }
01485     w= get_bits(&s->gb, 14);
01486     skip_bits(&s->gb, 1); //marker
01487     h= get_bits(&s->gb, 14);
01488     // remaining 3 bits are zero padding
01489 
01490     s1->pan_scan.width= 16*w;
01491     s1->pan_scan.height=16*h;
01492 
01493     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
01494         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
01495 }
01496 
01497 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
01498 {
01499     MpegEncContext *s= &s1->mpeg_enc_ctx;
01500     int i,nofco;
01501 
01502     nofco = 1;
01503     if(s->progressive_sequence){
01504         if(s->repeat_first_field){
01505             nofco++;
01506             if(s->top_field_first)
01507                 nofco++;
01508         }
01509     }else{
01510         if(s->picture_structure == PICT_FRAME){
01511             nofco++;
01512             if(s->repeat_first_field)
01513                 nofco++;
01514         }
01515     }
01516     for(i=0; i<nofco; i++){
01517         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
01518         skip_bits(&s->gb, 1); //marker
01519         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
01520         skip_bits(&s->gb, 1); //marker
01521     }
01522 
01523     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
01524         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
01525             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
01526             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
01527             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
01528         );
01529 }
01530 
01531 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
01532     int i;
01533 
01534     for(i=0; i<64; i++) {
01535         int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
01536         int v = get_bits(&s->gb, 8);
01537         if(v==0){
01538             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
01539             return -1;
01540         }
01541         if(intra && i==0 && v!=8){
01542             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
01543             v= 8; // needed by pink.mpg / issue1046
01544         }
01545         matrix0[j] = v;
01546         if(matrix1)
01547             matrix1[j] = v;
01548     }
01549     return 0;
01550 }
01551 
01552 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
01553 {
01554     av_dlog(s->avctx, "matrix extension\n");
01555 
01556     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
01557     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
01558     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
01559     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
01560 }
01561 
01562 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
01563 {
01564     MpegEncContext *s= &s1->mpeg_enc_ctx;
01565 
01566     s->full_pel[0] = s->full_pel[1] = 0;
01567     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
01568     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
01569     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
01570     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
01571     if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
01572         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
01573         if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
01574             if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
01575                 s->pict_type= AV_PICTURE_TYPE_I;
01576             else
01577                 s->pict_type= AV_PICTURE_TYPE_P;
01578         }else
01579             s->pict_type= AV_PICTURE_TYPE_B;
01580         s->current_picture.pict_type= s->pict_type;
01581         s->current_picture.key_frame= s->pict_type == AV_PICTURE_TYPE_I;
01582     }
01583     s->intra_dc_precision = get_bits(&s->gb, 2);
01584     s->picture_structure = get_bits(&s->gb, 2);
01585     s->top_field_first = get_bits1(&s->gb);
01586     s->frame_pred_frame_dct = get_bits1(&s->gb);
01587     s->concealment_motion_vectors = get_bits1(&s->gb);
01588     s->q_scale_type = get_bits1(&s->gb);
01589     s->intra_vlc_format = get_bits1(&s->gb);
01590     s->alternate_scan = get_bits1(&s->gb);
01591     s->repeat_first_field = get_bits1(&s->gb);
01592     s->chroma_420_type = get_bits1(&s->gb);
01593     s->progressive_frame = get_bits1(&s->gb);
01594 
01595     if(s->progressive_sequence && !s->progressive_frame){
01596         s->progressive_frame= 1;
01597         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
01598     }
01599 
01600     if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
01601         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
01602         s->picture_structure= PICT_FRAME;
01603     }
01604 
01605     if(s->progressive_sequence && !s->frame_pred_frame_dct){
01606         av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
01607     }
01608 
01609     if(s->picture_structure == PICT_FRAME){
01610         s->first_field=0;
01611         s->v_edge_pos= 16*s->mb_height;
01612     }else{
01613         s->first_field ^= 1;
01614         s->v_edge_pos=  8*s->mb_height;
01615         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
01616     }
01617 
01618     if(s->alternate_scan){
01619         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
01620         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
01621     }else{
01622         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
01623         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
01624     }
01625 
01626     /* composite display not parsed */
01627     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
01628     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
01629     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
01630     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
01631     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
01632     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
01633     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
01634     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
01635     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
01636 }
01637 
01638 static void exchange_uv(MpegEncContext *s){
01639     DCTELEM (*tmp)[64];
01640 
01641     tmp           = s->pblocks[4];
01642     s->pblocks[4] = s->pblocks[5];
01643     s->pblocks[5] = tmp;
01644 }
01645 
01646 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
01647     AVCodecContext *avctx= s->avctx;
01648     Mpeg1Context *s1 = (Mpeg1Context*)s;
01649 
01650     /* start frame decoding */
01651     if(s->first_field || s->picture_structure==PICT_FRAME){
01652         if(MPV_frame_start(s, avctx) < 0)
01653             return -1;
01654 
01655         ff_er_frame_start(s);
01656 
01657         /* first check if we must repeat the frame */
01658         s->current_picture_ptr->repeat_pict = 0;
01659         if (s->repeat_first_field) {
01660             if (s->progressive_sequence) {
01661                 if (s->top_field_first)
01662                     s->current_picture_ptr->repeat_pict = 4;
01663                 else
01664                     s->current_picture_ptr->repeat_pict = 2;
01665             } else if (s->progressive_frame) {
01666                 s->current_picture_ptr->repeat_pict = 1;
01667             }
01668         }
01669 
01670         *s->current_picture_ptr->pan_scan= s1->pan_scan;
01671 
01672         if (HAVE_PTHREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
01673             ff_thread_finish_setup(avctx);
01674     }else{ //second field
01675             int i;
01676 
01677             if(!s->current_picture_ptr){
01678                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
01679                 return -1;
01680             }
01681 
01682             for(i=0; i<4; i++){
01683                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
01684                 if(s->picture_structure == PICT_BOTTOM_FIELD){
01685                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
01686                 }
01687             }
01688     }
01689 
01690     if (avctx->hwaccel) {
01691         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
01692             return -1;
01693     }
01694 
01695 // MPV_frame_start will call this function too,
01696 // but we need to call it on every field
01697     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
01698         if(ff_xvmc_field_start(s,avctx) < 0)
01699             return -1;
01700 
01701     return 0;
01702 }
01703 
01704 #define DECODE_SLICE_ERROR -1
01705 #define DECODE_SLICE_OK 0
01706 
01712 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
01713                              const uint8_t **buf, int buf_size)
01714 {
01715     MpegEncContext *s = &s1->mpeg_enc_ctx;
01716     AVCodecContext *avctx= s->avctx;
01717     const int field_pic= s->picture_structure != PICT_FRAME;
01718     const int lowres= s->avctx->lowres;
01719 
01720     s->resync_mb_x=
01721     s->resync_mb_y= -1;
01722 
01723     assert(mb_y < s->mb_height);
01724 
01725     init_get_bits(&s->gb, *buf, buf_size*8);
01726 
01727     ff_mpeg1_clean_buffers(s);
01728     s->interlaced_dct = 0;
01729 
01730     s->qscale = get_qscale(s);
01731 
01732     if(s->qscale == 0){
01733         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
01734         return -1;
01735     }
01736 
01737     /* extra slice info */
01738     while (get_bits1(&s->gb) != 0) {
01739         skip_bits(&s->gb, 8);
01740     }
01741 
01742     s->mb_x=0;
01743 
01744     if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
01745         skip_bits1(&s->gb);
01746     }else{
01747         for(;;) {
01748             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
01749             if (code < 0){
01750                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
01751                 return -1;
01752             }
01753             if (code >= 33) {
01754                 if (code == 33) {
01755                     s->mb_x += 33;
01756                 }
01757                 /* otherwise, stuffing, nothing to do */
01758             } else {
01759                 s->mb_x += code;
01760                 break;
01761             }
01762         }
01763     }
01764 
01765     if(s->mb_x >= (unsigned)s->mb_width){
01766         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
01767         return -1;
01768     }
01769 
01770     if (avctx->hwaccel) {
01771         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
01772         int start_code = -1;
01773         buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
01774         if (buf_end < *buf + buf_size)
01775             buf_end -= 4;
01776         s->mb_y = mb_y;
01777         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
01778             return DECODE_SLICE_ERROR;
01779         *buf = buf_end;
01780         return DECODE_SLICE_OK;
01781     }
01782 
01783     s->resync_mb_x= s->mb_x;
01784     s->resync_mb_y= s->mb_y= mb_y;
01785     s->mb_skip_run= 0;
01786     ff_init_block_index(s);
01787 
01788     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
01789         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
01790              av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
01791                  s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
01792                  s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
01793                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
01794                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
01795                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
01796         }
01797     }
01798 
01799     for(;;) {
01800         //If 1, we memcpy blocks in xvmcvideo.
01801         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
01802             ff_xvmc_init_block(s);//set s->block
01803 
01804         if(mpeg_decode_mb(s, s->block) < 0)
01805             return -1;
01806 
01807         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
01808             const int wrap = s->b8_stride;
01809             int xy = s->mb_x*2 + s->mb_y*2*wrap;
01810             int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
01811             int motion_x, motion_y, dir, i;
01812 
01813             for(i=0; i<2; i++){
01814                 for(dir=0; dir<2; dir++){
01815                     if (s->mb_intra || (dir==1 && s->pict_type != AV_PICTURE_TYPE_B)) {
01816                         motion_x = motion_y = 0;
01817                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
01818                         motion_x = s->mv[dir][0][0];
01819                         motion_y = s->mv[dir][0][1];
01820                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
01821                         motion_x = s->mv[dir][i][0];
01822                         motion_y = s->mv[dir][i][1];
01823                     }
01824 
01825                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
01826                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
01827                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
01828                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
01829                     s->current_picture.ref_index [dir][b8_xy    ]=
01830                     s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
01831                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
01832                 }
01833                 xy += wrap;
01834                 b8_xy +=2;
01835             }
01836         }
01837 
01838         s->dest[0] += 16 >> lowres;
01839         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
01840         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
01841 
01842         MPV_decode_mb(s, s->block);
01843 
01844         if (++s->mb_x >= s->mb_width) {
01845             const int mb_size= 16>>s->avctx->lowres;
01846 
01847             ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
01848             MPV_report_decode_progress(s);
01849 
01850             s->mb_x = 0;
01851             s->mb_y += 1<<field_pic;
01852 
01853             if(s->mb_y >= s->mb_height){
01854                 int left= get_bits_left(&s->gb);
01855                 int is_d10= s->chroma_format==2 && s->pict_type==AV_PICTURE_TYPE_I && avctx->profile==0 && avctx->level==5
01856                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
01857                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
01858 
01859                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
01860                    || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
01861                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
01862                     return -1;
01863                 }else
01864                     goto eos;
01865             }
01866 
01867             ff_init_block_index(s);
01868         }
01869 
01870         /* skip mb handling */
01871         if (s->mb_skip_run == -1) {
01872             /* read increment again */
01873             s->mb_skip_run = 0;
01874             for(;;) {
01875                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
01876                 if (code < 0){
01877                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
01878                     return -1;
01879                 }
01880                 if (code >= 33) {
01881                     if (code == 33) {
01882                         s->mb_skip_run += 33;
01883                     }else if(code == 35){
01884                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
01885                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
01886                             return -1;
01887                         }
01888                         goto eos; /* end of slice */
01889                     }
01890                     /* otherwise, stuffing, nothing to do */
01891                 } else {
01892                     s->mb_skip_run += code;
01893                     break;
01894                 }
01895             }
01896             if(s->mb_skip_run){
01897                 int i;
01898                 if(s->pict_type == AV_PICTURE_TYPE_I){
01899                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
01900                     return -1;
01901                 }
01902 
01903                 /* skip mb */
01904                 s->mb_intra = 0;
01905                 for(i=0;i<12;i++)
01906                     s->block_last_index[i] = -1;
01907                 if(s->picture_structure == PICT_FRAME)
01908                     s->mv_type = MV_TYPE_16X16;
01909                 else
01910                     s->mv_type = MV_TYPE_FIELD;
01911                 if (s->pict_type == AV_PICTURE_TYPE_P) {
01912                     /* if P type, zero motion vector is implied */
01913                     s->mv_dir = MV_DIR_FORWARD;
01914                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
01915                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
01916                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
01917                     s->field_select[0][0]= (s->picture_structure - 1) & 1;
01918                 } else {
01919                     /* if B type, reuse previous vectors and directions */
01920                     s->mv[0][0][0] = s->last_mv[0][0][0];
01921                     s->mv[0][0][1] = s->last_mv[0][0][1];
01922                     s->mv[1][0][0] = s->last_mv[1][0][0];
01923                     s->mv[1][0][1] = s->last_mv[1][0][1];
01924                 }
01925             }
01926         }
01927     }
01928 eos: // end of slice
01929     *buf += (get_bits_count(&s->gb)-1)/8;
01930 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
01931     return 0;
01932 }
01933 
01934 static int slice_decode_thread(AVCodecContext *c, void *arg){
01935     MpegEncContext *s= *(void**)arg;
01936     const uint8_t *buf= s->gb.buffer;
01937     int mb_y= s->start_mb_y;
01938     const int field_pic= s->picture_structure != PICT_FRAME;
01939 
01940     s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
01941 
01942     for(;;){
01943         uint32_t start_code;
01944         int ret;
01945 
01946         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
01947         emms_c();
01948 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
01949 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
01950         if(ret < 0){
01951             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
01952                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
01953         }else{
01954             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
01955         }
01956 
01957         if(s->mb_y == s->end_mb_y)
01958             return 0;
01959 
01960         start_code= -1;
01961         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
01962         mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
01963         if (s->picture_structure == PICT_BOTTOM_FIELD)
01964             mb_y++;
01965         if(mb_y < 0 || mb_y >= s->end_mb_y)
01966             return -1;
01967     }
01968 
01969     return 0; //not reached
01970 }
01971 
01976 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
01977 {
01978     Mpeg1Context *s1 = avctx->priv_data;
01979     MpegEncContext *s = &s1->mpeg_enc_ctx;
01980 
01981     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
01982         return 0;
01983 
01984     if (s->avctx->hwaccel) {
01985         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
01986             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
01987     }
01988 
01989     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
01990         ff_xvmc_field_end(s);
01991 
01992     /* end of slice reached */
01993     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
01994         /* end of image */
01995 
01996         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
01997 
01998         ff_er_frame_end(s);
01999 
02000         MPV_frame_end(s);
02001 
02002         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
02003             *pict= *(AVFrame*)s->current_picture_ptr;
02004             ff_print_debug_info(s, pict);
02005         } else {
02006             if (avctx->active_thread_type & FF_THREAD_FRAME)
02007                 s->picture_number++;
02008             /* latency of 1 frame for I- and P-frames */
02009             /* XXX: use another variable than picture_number */
02010             if (s->last_picture_ptr != NULL) {
02011                 *pict= *(AVFrame*)s->last_picture_ptr;
02012                  ff_print_debug_info(s, pict);
02013             }
02014         }
02015 
02016         return 1;
02017     } else {
02018         return 0;
02019     }
02020 }
02021 
02022 static int mpeg1_decode_sequence(AVCodecContext *avctx,
02023                                  const uint8_t *buf, int buf_size)
02024 {
02025     Mpeg1Context *s1 = avctx->priv_data;
02026     MpegEncContext *s = &s1->mpeg_enc_ctx;
02027     int width,height;
02028     int i, v, j;
02029 
02030     init_get_bits(&s->gb, buf, buf_size*8);
02031 
02032     width = get_bits(&s->gb, 12);
02033     height = get_bits(&s->gb, 12);
02034     if (width <= 0 || height <= 0)
02035         return -1;
02036     s->aspect_ratio_info= get_bits(&s->gb, 4);
02037     if (s->aspect_ratio_info == 0) {
02038         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
02039         if (avctx->error_recognition >= FF_ER_COMPLIANT)
02040             return -1;
02041     }
02042     s->frame_rate_index = get_bits(&s->gb, 4);
02043     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
02044         return -1;
02045     s->bit_rate = get_bits(&s->gb, 18) * 400;
02046     if (get_bits1(&s->gb) == 0) /* marker */
02047         return -1;
02048     s->width = width;
02049     s->height = height;
02050 
02051     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
02052     skip_bits(&s->gb, 1);
02053 
02054     /* get matrix */
02055     if (get_bits1(&s->gb)) {
02056         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
02057     } else {
02058         for(i=0;i<64;i++) {
02059             j = s->dsp.idct_permutation[i];
02060             v = ff_mpeg1_default_intra_matrix[i];
02061             s->intra_matrix[j] = v;
02062             s->chroma_intra_matrix[j] = v;
02063         }
02064     }
02065     if (get_bits1(&s->gb)) {
02066         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
02067     } else {
02068         for(i=0;i<64;i++) {
02069             int j= s->dsp.idct_permutation[i];
02070             v = ff_mpeg1_default_non_intra_matrix[i];
02071             s->inter_matrix[j] = v;
02072             s->chroma_inter_matrix[j] = v;
02073         }
02074     }
02075 
02076     if(show_bits(&s->gb, 23) != 0){
02077         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
02078         return -1;
02079     }
02080 
02081     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
02082     s->progressive_sequence = 1;
02083     s->progressive_frame = 1;
02084     s->picture_structure = PICT_FRAME;
02085     s->frame_pred_frame_dct = 1;
02086     s->chroma_format = 1;
02087     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
02088     avctx->sub_id = 1; /* indicates MPEG-1 */
02089     s->out_format = FMT_MPEG1;
02090     s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
02091     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
02092 
02093     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
02094         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
02095                s->avctx->rc_buffer_size, s->bit_rate);
02096 
02097     return 0;
02098 }
02099 
02100 static int vcr2_init_sequence(AVCodecContext *avctx)
02101 {
02102     Mpeg1Context *s1 = avctx->priv_data;
02103     MpegEncContext *s = &s1->mpeg_enc_ctx;
02104     int i, v;
02105 
02106     /* start new MPEG-1 context decoding */
02107     s->out_format = FMT_MPEG1;
02108     if (s1->mpeg_enc_ctx_allocated) {
02109         MPV_common_end(s);
02110     }
02111     s->width  = avctx->coded_width;
02112     s->height = avctx->coded_height;
02113     avctx->has_b_frames= 0; //true?
02114     s->low_delay= 1;
02115 
02116     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
02117     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
02118 
02119     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
02120         if( avctx->idct_algo == FF_IDCT_AUTO )
02121             avctx->idct_algo = FF_IDCT_SIMPLE;
02122 
02123     if (MPV_common_init(s) < 0)
02124         return -1;
02125     exchange_uv(s);//common init reset pblocks, so we swap them here
02126     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
02127     s1->mpeg_enc_ctx_allocated = 1;
02128 
02129     for(i=0;i<64;i++) {
02130         int j= s->dsp.idct_permutation[i];
02131         v = ff_mpeg1_default_intra_matrix[i];
02132         s->intra_matrix[j] = v;
02133         s->chroma_intra_matrix[j] = v;
02134 
02135         v = ff_mpeg1_default_non_intra_matrix[i];
02136         s->inter_matrix[j] = v;
02137         s->chroma_inter_matrix[j] = v;
02138     }
02139 
02140     s->progressive_sequence = 1;
02141     s->progressive_frame = 1;
02142     s->picture_structure = PICT_FRAME;
02143     s->frame_pred_frame_dct = 1;
02144     s->chroma_format = 1;
02145     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
02146     avctx->sub_id = 2; /* indicates MPEG-2 */
02147     s1->save_width           = s->width;
02148     s1->save_height          = s->height;
02149     s1->save_progressive_seq = s->progressive_sequence;
02150     return 0;
02151 }
02152 
02153 
02154 static void mpeg_decode_user_data(AVCodecContext *avctx,
02155                                   const uint8_t *p, int buf_size)
02156 {
02157     const uint8_t *buf_end = p+buf_size;
02158 
02159     /* we parse the DTG active format information */
02160     if (buf_end - p >= 5 &&
02161         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
02162         int flags = p[4];
02163         p += 5;
02164         if (flags & 0x80) {
02165             /* skip event id */
02166             p += 2;
02167         }
02168         if (flags & 0x40) {
02169             if (buf_end - p < 1)
02170                 return;
02171             avctx->dtg_active_format = p[0] & 0x0f;
02172         }
02173     }
02174 }
02175 
02176 static void mpeg_decode_gop(AVCodecContext *avctx,
02177                             const uint8_t *buf, int buf_size){
02178     Mpeg1Context *s1 = avctx->priv_data;
02179     MpegEncContext *s = &s1->mpeg_enc_ctx;
02180 
02181     int time_code_hours, time_code_minutes;
02182     int time_code_seconds, time_code_pictures;
02183     int broken_link;
02184 
02185     init_get_bits(&s->gb, buf, buf_size*8);
02186 
02187     skip_bits1(&s->gb); /* drop_frame_flag */
02188 
02189     time_code_hours=get_bits(&s->gb,5);
02190     time_code_minutes = get_bits(&s->gb,6);
02191     skip_bits1(&s->gb);//marker bit
02192     time_code_seconds = get_bits(&s->gb,6);
02193     time_code_pictures = get_bits(&s->gb,6);
02194 
02195     s->closed_gop = get_bits1(&s->gb);
02196     /*broken_link indicate that after editing the
02197       reference frames of the first B-Frames after GOP I-Frame
02198       are missing (open gop)*/
02199     broken_link = get_bits1(&s->gb);
02200 
02201     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
02202         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
02203             time_code_hours, time_code_minutes, time_code_seconds,
02204             time_code_pictures, s->closed_gop, broken_link);
02205 }
02210 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
02211 {
02212     int i;
02213     uint32_t state= pc->state;
02214 
02215     /* EOF considered as end of frame */
02216     if (buf_size == 0)
02217         return 0;
02218 
02219 /*
02220  0  frame start         -> 1/4
02221  1  first_SEQEXT        -> 0/2
02222  2  first field start   -> 3/0
02223  3  second_SEQEXT       -> 2/0
02224  4  searching end
02225 */
02226 
02227     for(i=0; i<buf_size; i++){
02228         assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
02229         if(pc->frame_start_found&1){
02230             if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
02231                 pc->frame_start_found--;
02232             else if(state == EXT_START_CODE+2){
02233                 if((buf[i]&3) == 3) pc->frame_start_found= 0;
02234                 else                pc->frame_start_found= (pc->frame_start_found+1)&3;
02235             }
02236             state++;
02237         }else{
02238             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
02239             if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
02240                 i++;
02241                 pc->frame_start_found=4;
02242             }
02243             if(state == SEQ_END_CODE){
02244                 pc->state=-1;
02245                 return i+1;
02246             }
02247             if(pc->frame_start_found==2 && state == SEQ_START_CODE)
02248                 pc->frame_start_found= 0;
02249             if(pc->frame_start_found<4 && state == EXT_START_CODE)
02250                 pc->frame_start_found++;
02251             if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
02252                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
02253                     pc->frame_start_found=0;
02254                     pc->state=-1;
02255                     return i-3;
02256                 }
02257             }
02258             if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
02259                 ff_fetch_timestamp(s, i-3, 1);
02260             }
02261         }
02262     }
02263     pc->state= state;
02264     return END_NOT_FOUND;
02265 }
02266 
02267 static int decode_chunks(AVCodecContext *avctx,
02268                              AVFrame *picture, int *data_size,
02269                              const uint8_t *buf, int buf_size);
02270 
02271 /* handle buffering and image synchronisation */
02272 static int mpeg_decode_frame(AVCodecContext *avctx,
02273                              void *data, int *data_size,
02274                              AVPacket *avpkt)
02275 {
02276     const uint8_t *buf = avpkt->data;
02277     int buf_size = avpkt->size;
02278     Mpeg1Context *s = avctx->priv_data;
02279     AVFrame *picture = data;
02280     MpegEncContext *s2 = &s->mpeg_enc_ctx;
02281     av_dlog(avctx, "fill_buffer\n");
02282 
02283     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
02284         /* special case for last picture */
02285         if (s2->low_delay==0 && s2->next_picture_ptr) {
02286             *picture= *(AVFrame*)s2->next_picture_ptr;
02287             s2->next_picture_ptr= NULL;
02288 
02289             *data_size = sizeof(AVFrame);
02290         }
02291         return buf_size;
02292     }
02293 
02294     if(s2->flags&CODEC_FLAG_TRUNCATED){
02295         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
02296 
02297         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
02298             return buf_size;
02299     }
02300 
02301 #if 0
02302     if (s->repeat_field % 2 == 1) {
02303         s->repeat_field++;
02304         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
02305         //        s2->picture_number, s->repeat_field);
02306         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
02307             *data_size = sizeof(AVPicture);
02308             goto the_end;
02309         }
02310     }
02311 #endif
02312 
02313     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
02314         vcr2_init_sequence(avctx);
02315 
02316     s->slice_count= 0;
02317 
02318     if(avctx->extradata && !avctx->frame_number)
02319         decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
02320 
02321     return decode_chunks(avctx, picture, data_size, buf, buf_size);
02322 }
02323 
02324 static int decode_chunks(AVCodecContext *avctx,
02325                              AVFrame *picture, int *data_size,
02326                              const uint8_t *buf, int buf_size)
02327 {
02328     Mpeg1Context *s = avctx->priv_data;
02329     MpegEncContext *s2 = &s->mpeg_enc_ctx;
02330     const uint8_t *buf_ptr = buf;
02331     const uint8_t *buf_end = buf + buf_size;
02332     int ret, input_size;
02333     int last_code= 0;
02334 
02335     for(;;) {
02336         /* find next start code */
02337         uint32_t start_code = -1;
02338         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
02339         if (start_code > 0x1ff){
02340             if(s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT){
02341                 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
02342                     int i;
02343                     av_assert0(avctx->thread_count > 1);
02344 
02345                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
02346                     for(i=0; i<s->slice_count; i++)
02347                         s2->error_count += s2->thread_context[i]->error_count;
02348                 }
02349 
02350                 if (CONFIG_VDPAU && uses_vdpau(avctx))
02351                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
02352 
02353                 if (slice_end(avctx, picture)) {
02354                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
02355                         *data_size = sizeof(AVPicture);
02356                 }
02357             }
02358             s2->pict_type= 0;
02359             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
02360         }
02361 
02362         input_size = buf_end - buf_ptr;
02363 
02364         if(avctx->debug & FF_DEBUG_STARTCODE){
02365             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
02366         }
02367 
02368         /* prepare data for next start code */
02369         switch(start_code) {
02370         case SEQ_START_CODE:
02371             if(last_code == 0){
02372             mpeg1_decode_sequence(avctx, buf_ptr,
02373                                     input_size);
02374                 s->sync=1;
02375             }else{
02376                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
02377             }
02378             break;
02379 
02380         case PICTURE_START_CODE:
02381             if (HAVE_THREADS && (avctx->active_thread_type&FF_THREAD_SLICE) && s->slice_count) {
02382                 int i;
02383 
02384                 avctx->execute(avctx, slice_decode_thread,
02385                                s2->thread_context, NULL,
02386                                s->slice_count, sizeof(void*));
02387                 for (i = 0; i < s->slice_count; i++)
02388                     s2->error_count += s2->thread_context[i]->error_count;
02389                 s->slice_count = 0;
02390             }
02391             if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
02392             if(mpeg_decode_postinit(avctx) < 0){
02393                 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
02394                 return -1;
02395             }
02396 
02397             /* we have a complete image: we try to decompress it */
02398             if(mpeg1_decode_picture(avctx,
02399                                     buf_ptr, input_size) < 0)
02400                 s2->pict_type=0;
02401                 s2->first_slice = 1;
02402             last_code= PICTURE_START_CODE;
02403             }else{
02404                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
02405             }
02406             break;
02407         case EXT_START_CODE:
02408             init_get_bits(&s2->gb, buf_ptr, input_size*8);
02409 
02410             switch(get_bits(&s2->gb, 4)) {
02411             case 0x1:
02412                 if(last_code == 0){
02413                 mpeg_decode_sequence_extension(s);
02414                 }else{
02415                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
02416                 }
02417                 break;
02418             case 0x2:
02419                 mpeg_decode_sequence_display_extension(s);
02420                 break;
02421             case 0x3:
02422                 mpeg_decode_quant_matrix_extension(s2);
02423                 break;
02424             case 0x7:
02425                 mpeg_decode_picture_display_extension(s);
02426                 break;
02427             case 0x8:
02428                 if(last_code == PICTURE_START_CODE){
02429                 mpeg_decode_picture_coding_extension(s);
02430                 }else{
02431                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
02432                 }
02433                 break;
02434             }
02435             break;
02436         case USER_START_CODE:
02437             mpeg_decode_user_data(avctx,
02438                                     buf_ptr, input_size);
02439             break;
02440         case GOP_START_CODE:
02441             if(last_code == 0){
02442             s2->first_field=0;
02443             mpeg_decode_gop(avctx,
02444                                     buf_ptr, input_size);
02445                 s->sync=1;
02446             }else{
02447                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
02448             }
02449             break;
02450         default:
02451             if (start_code >= SLICE_MIN_START_CODE &&
02452                 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
02453                 const int field_pic= s2->picture_structure != PICT_FRAME;
02454                 int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
02455                 last_code= SLICE_MIN_START_CODE;
02456 
02457                 if(s2->picture_structure == PICT_BOTTOM_FIELD)
02458                     mb_y++;
02459 
02460                 if (mb_y >= s2->mb_height){
02461                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
02462                     return -1;
02463                 }
02464 
02465                 if(s2->last_picture_ptr==NULL){
02466                 /* Skip B-frames if we do not have reference frames and gop is not closed */
02467                     if(s2->pict_type==AV_PICTURE_TYPE_B){
02468                         if(!s2->closed_gop)
02469                             break;
02470                     }
02471                 }
02472                 if(s2->pict_type==AV_PICTURE_TYPE_I)
02473                     s->sync=1;
02474                 if(s2->next_picture_ptr==NULL){
02475                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
02476                     if(s2->pict_type==AV_PICTURE_TYPE_P && !s->sync) break;
02477                 }
02478 #if FF_API_HURRY_UP
02479                 /* Skip B-frames if we are in a hurry. */
02480                 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
02481 #endif
02482                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==AV_PICTURE_TYPE_B)
02483                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=AV_PICTURE_TYPE_I)
02484                     || avctx->skip_frame >= AVDISCARD_ALL)
02485                     break;
02486 #if FF_API_HURRY_UP
02487                 /* Skip everything if we are in a hurry>=5. */
02488                 if(avctx->hurry_up>=5) break;
02489 #endif
02490 
02491                 if (!s->mpeg_enc_ctx_allocated) break;
02492 
02493                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
02494                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
02495                         break;
02496                 }
02497 
02498                 if(!s2->pict_type){
02499                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
02500                     break;
02501                 }
02502 
02503                 if(s2->first_slice){
02504                     s2->first_slice=0;
02505                     if(mpeg_field_start(s2, buf, buf_size) < 0)
02506                         return -1;
02507                 }
02508                 if(!s2->current_picture_ptr){
02509                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
02510                     return -1;
02511                 }
02512 
02513                 if (uses_vdpau(avctx)) {
02514                     s->slice_count++;
02515                     break;
02516                 }
02517 
02518                 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
02519                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
02520                     av_assert0(avctx->thread_count > 1);
02521                     if(threshold <= mb_y){
02522                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
02523 
02524                         thread_context->start_mb_y= mb_y;
02525                         thread_context->end_mb_y  = s2->mb_height;
02526                         if(s->slice_count){
02527                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
02528                             ff_update_duplicate_context(thread_context, s2);
02529                         }
02530                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
02531                         s->slice_count++;
02532                     }
02533                     buf_ptr += 2; //FIXME add minimum number of bytes per slice
02534                 }else{
02535                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
02536                     emms_c();
02537 
02538                     if(ret < 0){
02539                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
02540                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
02541                     }else{
02542                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
02543                     }
02544                 }
02545             }
02546             break;
02547         }
02548     }
02549 }
02550 
02551 static void flush(AVCodecContext *avctx){
02552     Mpeg1Context *s = avctx->priv_data;
02553 
02554     s->sync=0;
02555 
02556     ff_mpeg_flush(avctx);
02557 }
02558 
02559 static int mpeg_decode_end(AVCodecContext *avctx)
02560 {
02561     Mpeg1Context *s = avctx->priv_data;
02562 
02563     if (s->mpeg_enc_ctx_allocated)
02564         MPV_common_end(&s->mpeg_enc_ctx);
02565     return 0;
02566 }
02567 
02568 static const AVProfile mpeg2_video_profiles[] = {
02569     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
02570     { FF_PROFILE_MPEG2_HIGH,         "High"               },
02571     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
02572     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
02573     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
02574     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
02575     { FF_PROFILE_RESERVED,           "Reserved"           },
02576     { FF_PROFILE_RESERVED,           "Reserved"           },
02577     { FF_PROFILE_UNKNOWN },
02578 };
02579 
02580 
02581 AVCodec ff_mpeg1video_decoder = {
02582     "mpeg1video",
02583     AVMEDIA_TYPE_VIDEO,
02584     CODEC_ID_MPEG1VIDEO,
02585     sizeof(Mpeg1Context),
02586     mpeg_decode_init,
02587     NULL,
02588     mpeg_decode_end,
02589     mpeg_decode_frame,
02590     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
02591     .flush= flush,
02592     .max_lowres= 3,
02593     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
02594     .update_thread_context= ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
02595 };
02596 
02597 AVCodec ff_mpeg2video_decoder = {
02598     "mpeg2video",
02599     AVMEDIA_TYPE_VIDEO,
02600     CODEC_ID_MPEG2VIDEO,
02601     sizeof(Mpeg1Context),
02602     mpeg_decode_init,
02603     NULL,
02604     mpeg_decode_end,
02605     mpeg_decode_frame,
02606     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
02607     .flush= flush,
02608     .max_lowres= 3,
02609     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
02610     .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
02611 };
02612 
02613 //legacy decoder
02614 AVCodec ff_mpegvideo_decoder = {
02615     "mpegvideo",
02616     AVMEDIA_TYPE_VIDEO,
02617     CODEC_ID_MPEG2VIDEO,
02618     sizeof(Mpeg1Context),
02619     mpeg_decode_init,
02620     NULL,
02621     mpeg_decode_end,
02622     mpeg_decode_frame,
02623     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
02624     .flush= flush,
02625     .max_lowres= 3,
02626     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
02627 };
02628 
02629 #if CONFIG_MPEG_XVMC_DECODER
02630 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
02631     if( avctx->active_thread_type & FF_THREAD_SLICE )
02632         return -1;
02633     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
02634         return -1;
02635     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
02636         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
02637     }
02638     mpeg_decode_init(avctx);
02639 
02640     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
02641     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
02642 
02643     return 0;
02644 }
02645 
02646 AVCodec ff_mpeg_xvmc_decoder = {
02647     "mpegvideo_xvmc",
02648     AVMEDIA_TYPE_VIDEO,
02649     CODEC_ID_MPEG2VIDEO_XVMC,
02650     sizeof(Mpeg1Context),
02651     mpeg_mc_decode_init,
02652     NULL,
02653     mpeg_decode_end,
02654     mpeg_decode_frame,
02655     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
02656     .flush= flush,
02657     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
02658 };
02659 
02660 #endif
02661 
02662 #if CONFIG_MPEG_VDPAU_DECODER
02663 AVCodec ff_mpeg_vdpau_decoder = {
02664     "mpegvideo_vdpau",
02665     AVMEDIA_TYPE_VIDEO,
02666     CODEC_ID_MPEG2VIDEO,
02667     sizeof(Mpeg1Context),
02668     mpeg_decode_init,
02669     NULL,
02670     mpeg_decode_end,
02671     mpeg_decode_frame,
02672     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
02673     .flush= flush,
02674     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
02675 };
02676 #endif
02677 
02678 #if CONFIG_MPEG1_VDPAU_DECODER
02679 AVCodec ff_mpeg1_vdpau_decoder = {
02680     "mpeg1video_vdpau",
02681     AVMEDIA_TYPE_VIDEO,
02682     CODEC_ID_MPEG1VIDEO,
02683     sizeof(Mpeg1Context),
02684     mpeg_decode_init,
02685     NULL,
02686     mpeg_decode_end,
02687     mpeg_decode_frame,
02688     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
02689     .flush= flush,
02690     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
02691 };
02692 #endif
02693 

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