Libav
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00001 /* 00002 * H.263 decoder 00003 * Copyright (c) 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 #include "internal.h" 00029 #include "avcodec.h" 00030 #include "dsputil.h" 00031 #include "mpegvideo.h" 00032 #include "h263.h" 00033 #include "h263_parser.h" 00034 #include "mpeg4video_parser.h" 00035 #include "msmpeg4.h" 00036 #include "vdpau_internal.h" 00037 #include "flv.h" 00038 #include "mpeg4video.h" 00039 00040 //#define DEBUG 00041 //#define PRINT_FRAME_TIME 00042 00043 av_cold int ff_h263_decode_init(AVCodecContext *avctx) 00044 { 00045 MpegEncContext *s = avctx->priv_data; 00046 00047 s->avctx = avctx; 00048 s->out_format = FMT_H263; 00049 00050 s->width = avctx->coded_width; 00051 s->height = avctx->coded_height; 00052 s->workaround_bugs= avctx->workaround_bugs; 00053 00054 // set defaults 00055 MPV_decode_defaults(s); 00056 s->quant_precision=5; 00057 s->decode_mb= ff_h263_decode_mb; 00058 s->low_delay= 1; 00059 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts); 00060 s->unrestricted_mv= 1; 00061 00062 /* select sub codec */ 00063 switch(avctx->codec->id) { 00064 case CODEC_ID_H263: 00065 s->unrestricted_mv= 0; 00066 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; 00067 break; 00068 case CODEC_ID_MPEG4: 00069 break; 00070 case CODEC_ID_MSMPEG4V1: 00071 s->h263_msmpeg4 = 1; 00072 s->h263_pred = 1; 00073 s->msmpeg4_version=1; 00074 break; 00075 case CODEC_ID_MSMPEG4V2: 00076 s->h263_msmpeg4 = 1; 00077 s->h263_pred = 1; 00078 s->msmpeg4_version=2; 00079 break; 00080 case CODEC_ID_MSMPEG4V3: 00081 s->h263_msmpeg4 = 1; 00082 s->h263_pred = 1; 00083 s->msmpeg4_version=3; 00084 break; 00085 case CODEC_ID_WMV1: 00086 s->h263_msmpeg4 = 1; 00087 s->h263_pred = 1; 00088 s->msmpeg4_version=4; 00089 break; 00090 case CODEC_ID_WMV2: 00091 s->h263_msmpeg4 = 1; 00092 s->h263_pred = 1; 00093 s->msmpeg4_version=5; 00094 break; 00095 case CODEC_ID_VC1: 00096 case CODEC_ID_WMV3: 00097 s->h263_msmpeg4 = 1; 00098 s->h263_pred = 1; 00099 s->msmpeg4_version=6; 00100 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; 00101 break; 00102 case CODEC_ID_H263I: 00103 break; 00104 case CODEC_ID_FLV1: 00105 s->h263_flv = 1; 00106 break; 00107 default: 00108 return -1; 00109 } 00110 s->codec_id= avctx->codec->id; 00111 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); 00112 00113 /* for h263, we allocate the images after having read the header */ 00114 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) 00115 if (MPV_common_init(s) < 0) 00116 return -1; 00117 00118 h263_decode_init_vlc(s); 00119 00120 return 0; 00121 } 00122 00123 av_cold int ff_h263_decode_end(AVCodecContext *avctx) 00124 { 00125 MpegEncContext *s = avctx->priv_data; 00126 00127 MPV_common_end(s); 00128 return 0; 00129 } 00130 00134 static int get_consumed_bytes(MpegEncContext *s, int buf_size){ 00135 int pos= (get_bits_count(&s->gb)+7)>>3; 00136 00137 if(s->divx_packed || s->avctx->hwaccel){ 00138 //we would have to scan through the whole buf to handle the weird reordering ... 00139 return buf_size; 00140 }else if(s->flags&CODEC_FLAG_TRUNCATED){ 00141 pos -= s->parse_context.last_index; 00142 if(pos<0) pos=0; // padding is not really read so this might be -1 00143 return pos; 00144 }else{ 00145 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) 00146 if(pos+10>buf_size) pos=buf_size; // oops ;) 00147 00148 return pos; 00149 } 00150 } 00151 00152 static int decode_slice(MpegEncContext *s){ 00153 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F; 00154 const int mb_size= 16>>s->avctx->lowres; 00155 s->last_resync_gb= s->gb; 00156 s->first_slice_line= 1; 00157 00158 s->resync_mb_x= s->mb_x; 00159 s->resync_mb_y= s->mb_y; 00160 00161 ff_set_qscale(s, s->qscale); 00162 00163 if (s->avctx->hwaccel) { 00164 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; 00165 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end); 00166 skip_bits_long(&s->gb, 8*(end - start)); 00167 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); 00168 } 00169 00170 if(s->partitioned_frame){ 00171 const int qscale= s->qscale; 00172 00173 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 00174 if(ff_mpeg4_decode_partitions(s) < 0) 00175 return -1; 00176 } 00177 00178 /* restore variables which were modified */ 00179 s->first_slice_line=1; 00180 s->mb_x= s->resync_mb_x; 00181 s->mb_y= s->resync_mb_y; 00182 ff_set_qscale(s, qscale); 00183 } 00184 00185 for(; s->mb_y < s->mb_height; s->mb_y++) { 00186 /* per-row end of slice checks */ 00187 if(s->msmpeg4_version){ 00188 if(s->resync_mb_y + s->slice_height == s->mb_y){ 00189 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); 00190 00191 return 0; 00192 } 00193 } 00194 00195 if(s->msmpeg4_version==1){ 00196 s->last_dc[0]= 00197 s->last_dc[1]= 00198 s->last_dc[2]= 128; 00199 } 00200 00201 ff_init_block_index(s); 00202 for(; s->mb_x < s->mb_width; s->mb_x++) { 00203 int ret; 00204 00205 ff_update_block_index(s); 00206 00207 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ 00208 s->first_slice_line=0; 00209 } 00210 00211 /* DCT & quantize */ 00212 00213 s->mv_dir = MV_DIR_FORWARD; 00214 s->mv_type = MV_TYPE_16X16; 00215 // s->mb_skipped = 0; 00216 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); 00217 ret= s->decode_mb(s, s->block); 00218 00219 if (s->pict_type!=FF_B_TYPE) 00220 ff_h263_update_motion_val(s); 00221 00222 if(ret<0){ 00223 const int xy= s->mb_x + s->mb_y*s->mb_stride; 00224 if(ret==SLICE_END){ 00225 MPV_decode_mb(s, s->block); 00226 if(s->loop_filter) 00227 ff_h263_loop_filter(s); 00228 00229 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24)); 00230 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask); 00231 00232 s->padding_bug_score--; 00233 00234 if(++s->mb_x >= s->mb_width){ 00235 s->mb_x=0; 00236 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 00237 s->mb_y++; 00238 } 00239 return 0; 00240 }else if(ret==SLICE_NOEND){ 00241 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); 00242 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)&part_mask); 00243 return -1; 00244 } 00245 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); 00246 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)&part_mask); 00247 00248 return -1; 00249 } 00250 00251 MPV_decode_mb(s, s->block); 00252 if(s->loop_filter) 00253 ff_h263_loop_filter(s); 00254 } 00255 00256 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); 00257 00258 s->mb_x= 0; 00259 } 00260 00261 assert(s->mb_x==0 && s->mb_y==s->mb_height); 00262 00263 /* try to detect the padding bug */ 00264 if( s->codec_id==CODEC_ID_MPEG4 00265 && (s->workaround_bugs&FF_BUG_AUTODETECT) 00266 && get_bits_left(&s->gb) >=0 00267 && get_bits_left(&s->gb) < 48 00268 // && !s->resync_marker 00269 && !s->data_partitioning){ 00270 00271 const int bits_count= get_bits_count(&s->gb); 00272 const int bits_left = s->gb.size_in_bits - bits_count; 00273 00274 if(bits_left==0){ 00275 s->padding_bug_score+=16; 00276 } else if(bits_left != 1){ 00277 int v= show_bits(&s->gb, 8); 00278 v|= 0x7F >> (7-(bits_count&7)); 00279 00280 if(v==0x7F && bits_left<=8) 00281 s->padding_bug_score--; 00282 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) 00283 s->padding_bug_score+= 4; 00284 else 00285 s->padding_bug_score++; 00286 } 00287 } 00288 00289 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 00290 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) 00291 s->workaround_bugs |= FF_BUG_NO_PADDING; 00292 else 00293 s->workaround_bugs &= ~FF_BUG_NO_PADDING; 00294 } 00295 00296 // handle formats which don't have unique end markers 00297 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly 00298 int left= get_bits_left(&s->gb); 00299 int max_extra=7; 00300 00301 /* no markers in M$ crap */ 00302 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE) 00303 max_extra+= 17; 00304 00305 /* buggy padding but the frame should still end approximately at the bitstream end */ 00306 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3) 00307 max_extra+= 48; 00308 else if((s->workaround_bugs&FF_BUG_NO_PADDING)) 00309 max_extra+= 256*256*256*64; 00310 00311 if(left>max_extra){ 00312 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); 00313 } 00314 else if(left<0){ 00315 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); 00316 }else 00317 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); 00318 00319 return 0; 00320 } 00321 00322 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 00323 get_bits_left(&s->gb), 00324 show_bits(&s->gb, 24), s->padding_bug_score); 00325 00326 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask); 00327 00328 return -1; 00329 } 00330 00331 int ff_h263_decode_frame(AVCodecContext *avctx, 00332 void *data, int *data_size, 00333 AVPacket *avpkt) 00334 { 00335 const uint8_t *buf = avpkt->data; 00336 int buf_size = avpkt->size; 00337 MpegEncContext *s = avctx->priv_data; 00338 int ret; 00339 AVFrame *pict = data; 00340 00341 #ifdef PRINT_FRAME_TIME 00342 uint64_t time= rdtsc(); 00343 #endif 00344 s->flags= avctx->flags; 00345 s->flags2= avctx->flags2; 00346 00347 /* no supplementary picture */ 00348 if (buf_size == 0) { 00349 /* special case for last picture */ 00350 if (s->low_delay==0 && s->next_picture_ptr) { 00351 *pict= *(AVFrame*)s->next_picture_ptr; 00352 s->next_picture_ptr= NULL; 00353 00354 *data_size = sizeof(AVFrame); 00355 } 00356 00357 return 0; 00358 } 00359 00360 if(s->flags&CODEC_FLAG_TRUNCATED){ 00361 int next; 00362 00363 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ 00364 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); 00365 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){ 00366 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); 00367 }else{ 00368 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); 00369 return -1; 00370 } 00371 00372 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) 00373 return buf_size; 00374 } 00375 00376 00377 retry: 00378 00379 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder 00380 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); 00381 }else 00382 init_get_bits(&s->gb, buf, buf_size*8); 00383 s->bitstream_buffer_size=0; 00384 00385 if (!s->context_initialized) { 00386 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix 00387 return -1; 00388 } 00389 00390 /* We need to set current_picture_ptr before reading the header, 00391 * otherwise we cannot store anyting in there */ 00392 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){ 00393 int i= ff_find_unused_picture(s, 0); 00394 s->current_picture_ptr= &s->picture[i]; 00395 } 00396 00397 /* let's go :-) */ 00398 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { 00399 ret= ff_wmv2_decode_picture_header(s); 00400 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { 00401 ret = msmpeg4_decode_picture_header(s); 00402 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) { 00403 if(s->avctx->extradata_size && s->picture_number==0){ 00404 GetBitContext gb; 00405 00406 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); 00407 ret = ff_mpeg4_decode_picture_header(s, &gb); 00408 } 00409 ret = ff_mpeg4_decode_picture_header(s, &s->gb); 00410 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) { 00411 ret = ff_intel_h263_decode_picture_header(s); 00412 } else if (CONFIG_FLV_DECODER && s->h263_flv) { 00413 ret = ff_flv_decode_picture_header(s); 00414 } else { 00415 ret = h263_decode_picture_header(s); 00416 } 00417 00418 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); 00419 00420 /* skip if the header was thrashed */ 00421 if (ret < 0){ 00422 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); 00423 return -1; 00424 } 00425 00426 avctx->has_b_frames= !s->low_delay; 00427 00428 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 00429 if(s->stream_codec_tag == AV_RL32("XVID") || 00430 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || 00431 s->codec_tag == AV_RL32("RMP4") || 00432 s->codec_tag == AV_RL32("SIPP") 00433 ) 00434 s->xvid_build= 0; 00435 #if 0 00436 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 00437 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 00438 s->xvid_build= 0; 00439 #endif 00440 } 00441 00442 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ 00443 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) 00444 s->divx_version= 400; //divx 4 00445 } 00446 00447 if(s->xvid_build>=0 && s->divx_version>=0){ 00448 s->divx_version= 00449 s->divx_build= -1; 00450 } 00451 00452 if(s->workaround_bugs&FF_BUG_AUTODETECT){ 00453 if(s->codec_tag == AV_RL32("XVIX")) 00454 s->workaround_bugs|= FF_BUG_XVID_ILACE; 00455 00456 if(s->codec_tag == AV_RL32("UMP4")){ 00457 s->workaround_bugs|= FF_BUG_UMP4; 00458 } 00459 00460 if(s->divx_version>=500 && s->divx_build<1814){ 00461 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 00462 } 00463 00464 if(s->divx_version>502 && s->divx_build<1814){ 00465 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; 00466 } 00467 00468 if(s->xvid_build<=3U) 00469 s->padding_bug_score= 256*256*256*64; 00470 00471 if(s->xvid_build<=1U) 00472 s->workaround_bugs|= FF_BUG_QPEL_CHROMA; 00473 00474 if(s->xvid_build<=12U) 00475 s->workaround_bugs|= FF_BUG_EDGE; 00476 00477 if(s->xvid_build<=32U) 00478 s->workaround_bugs|= FF_BUG_DC_CLIP; 00479 00480 #define SET_QPEL_FUNC(postfix1, postfix2) \ 00481 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\ 00482 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\ 00483 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2; 00484 00485 if(s->lavc_build<4653U) 00486 s->workaround_bugs|= FF_BUG_STD_QPEL; 00487 00488 if(s->lavc_build<4655U) 00489 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 00490 00491 if(s->lavc_build<4670U){ 00492 s->workaround_bugs|= FF_BUG_EDGE; 00493 } 00494 00495 if(s->lavc_build<=4712U) 00496 s->workaround_bugs|= FF_BUG_DC_CLIP; 00497 00498 if(s->divx_version>=0) 00499 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; 00500 //printf("padding_bug_score: %d\n", s->padding_bug_score); 00501 if(s->divx_version==501 && s->divx_build==20020416) 00502 s->padding_bug_score= 256*256*256*64; 00503 00504 if(s->divx_version<500U){ 00505 s->workaround_bugs|= FF_BUG_EDGE; 00506 } 00507 00508 if(s->divx_version>=0) 00509 s->workaround_bugs|= FF_BUG_HPEL_CHROMA; 00510 #if 0 00511 if(s->divx_version==500) 00512 s->padding_bug_score= 256*256*256*64; 00513 00514 /* very ugly XVID padding bug detection FIXME/XXX solve this differently 00515 * Let us hope this at least works. 00516 */ 00517 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1 00518 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0) 00519 s->workaround_bugs|= FF_BUG_NO_PADDING; 00520 00521 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok 00522 s->workaround_bugs|= FF_BUG_NO_PADDING; 00523 #endif 00524 } 00525 00526 if(s->workaround_bugs& FF_BUG_STD_QPEL){ 00527 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c) 00528 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c) 00529 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c) 00530 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) 00531 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) 00532 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) 00533 00534 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c) 00535 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c) 00536 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c) 00537 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) 00538 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) 00539 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) 00540 } 00541 00542 if(avctx->debug & FF_DEBUG_BUGS) 00543 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 00544 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build, 00545 s->divx_packed ? "p" : ""); 00546 00547 #if 0 // dump bits per frame / qp / complexity 00548 { 00549 static FILE *f=NULL; 00550 if(!f) f=fopen("rate_qp_cplx.txt", "w"); 00551 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale); 00552 } 00553 #endif 00554 00555 #if HAVE_MMX 00556 if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){ 00557 avctx->idct_algo= FF_IDCT_XVIDMMX; 00558 avctx->coded_width= 0; // force reinit 00559 // dsputil_init(&s->dsp, avctx); 00560 s->picture_number=0; 00561 } 00562 #endif 00563 00564 /* After H263 & mpeg4 header decode we have the height, width,*/ 00565 /* and other parameters. So then we could init the picture */ 00566 /* FIXME: By the way H263 decoder is evolving it should have */ 00567 /* an H263EncContext */ 00568 00569 if ( s->width != avctx->coded_width 00570 || s->height != avctx->coded_height) { 00571 /* H.263 could change picture size any time */ 00572 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat 00573 s->parse_context.buffer=0; 00574 MPV_common_end(s); 00575 s->parse_context= pc; 00576 } 00577 if (!s->context_initialized) { 00578 avcodec_set_dimensions(avctx, s->width, s->height); 00579 00580 goto retry; 00581 } 00582 00583 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I)) 00584 s->gob_index = ff_h263_get_gob_height(s); 00585 00586 // for hurry_up==5 00587 s->current_picture.pict_type= s->pict_type; 00588 s->current_picture.key_frame= s->pict_type == FF_I_TYPE; 00589 00590 /* skip B-frames if we don't have reference frames */ 00591 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size); 00592 /* skip b frames if we are in a hurry */ 00593 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size); 00594 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE) 00595 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE) 00596 || avctx->skip_frame >= AVDISCARD_ALL) 00597 return get_consumed_bytes(s, buf_size); 00598 /* skip everything if we are in a hurry>=5 */ 00599 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size); 00600 00601 if(s->next_p_frame_damaged){ 00602 if(s->pict_type==FF_B_TYPE) 00603 return get_consumed_bytes(s, buf_size); 00604 else 00605 s->next_p_frame_damaged=0; 00606 } 00607 00608 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){ 00609 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab; 00610 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab; 00611 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){ 00612 s->me.qpel_put= s->dsp.put_qpel_pixels_tab; 00613 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 00614 }else{ 00615 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab; 00616 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; 00617 } 00618 00619 if(MPV_frame_start(s, avctx) < 0) 00620 return -1; 00621 00622 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { 00623 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); 00624 goto frame_end; 00625 } 00626 00627 if (avctx->hwaccel) { 00628 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0) 00629 return -1; 00630 } 00631 00632 ff_er_frame_start(s); 00633 00634 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type 00635 //which is not available before MPV_frame_start() 00636 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){ 00637 ret = ff_wmv2_decode_secondary_picture_header(s); 00638 if(ret<0) return ret; 00639 if(ret==1) goto intrax8_decoded; 00640 } 00641 00642 /* decode each macroblock */ 00643 s->mb_x=0; 00644 s->mb_y=0; 00645 00646 decode_slice(s); 00647 while(s->mb_y<s->mb_height){ 00648 if(s->msmpeg4_version){ 00649 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits) 00650 break; 00651 }else{ 00652 if(ff_h263_resync(s)<0) 00653 break; 00654 } 00655 00656 if(s->msmpeg4_version<4 && s->h263_pred) 00657 ff_mpeg4_clean_buffers(s); 00658 00659 decode_slice(s); 00660 } 00661 00662 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE) 00663 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){ 00664 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR; 00665 } 00666 00667 assert(s->bitstream_buffer_size==0); 00668 frame_end: 00669 /* divx 5.01+ bistream reorder stuff */ 00670 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){ 00671 int current_pos= get_bits_count(&s->gb)>>3; 00672 int startcode_found=0; 00673 00674 if(buf_size - current_pos > 5){ 00675 int i; 00676 for(i=current_pos; i<buf_size-3; i++){ 00677 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ 00678 startcode_found=1; 00679 break; 00680 } 00681 } 00682 } 00683 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style 00684 startcode_found=1; 00685 current_pos=0; 00686 } 00687 00688 if(startcode_found){ 00689 av_fast_malloc( 00690 &s->bitstream_buffer, 00691 &s->allocated_bitstream_buffer_size, 00692 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE); 00693 if (!s->bitstream_buffer) 00694 return AVERROR(ENOMEM); 00695 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); 00696 s->bitstream_buffer_size= buf_size - current_pos; 00697 } 00698 } 00699 00700 intrax8_decoded: 00701 ff_er_frame_end(s); 00702 00703 if (avctx->hwaccel) { 00704 if (avctx->hwaccel->end_frame(avctx) < 0) 00705 return -1; 00706 } 00707 00708 MPV_frame_end(s); 00709 00710 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type); 00711 assert(s->current_picture.pict_type == s->pict_type); 00712 if (s->pict_type == FF_B_TYPE || s->low_delay) { 00713 *pict= *(AVFrame*)s->current_picture_ptr; 00714 } else if (s->last_picture_ptr != NULL) { 00715 *pict= *(AVFrame*)s->last_picture_ptr; 00716 } 00717 00718 if(s->last_picture_ptr || s->low_delay){ 00719 *data_size = sizeof(AVFrame); 00720 ff_print_debug_info(s, pict); 00721 } 00722 00723 #ifdef PRINT_FRAME_TIME 00724 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); 00725 #endif 00726 00727 return get_consumed_bytes(s, buf_size); 00728 } 00729 00730 AVCodec h263_decoder = { 00731 "h263", 00732 AVMEDIA_TYPE_VIDEO, 00733 CODEC_ID_H263, 00734 sizeof(MpegEncContext), 00735 ff_h263_decode_init, 00736 NULL, 00737 ff_h263_decode_end, 00738 ff_h263_decode_frame, 00739 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, 00740 .flush= ff_mpeg_flush, 00741 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), 00742 .pix_fmts= ff_hwaccel_pixfmt_list_420, 00743 };