Mercurial > hg > pmhd
diff ffmpeg/libavcodec/h263dec.c @ 10:6840f77b83aa
commit
| author | Yading Song <yading.song@eecs.qmul.ac.uk> |
|---|---|
| date | Sun, 21 Apr 2013 10:55:35 +0200 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ffmpeg/libavcodec/h263dec.c Sun Apr 21 10:55:35 2013 +0200 @@ -0,0 +1,817 @@ +/* + * H.263 decoder + * Copyright (c) 2001 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * H.263 decoder. + */ + +#define UNCHECKED_BITSTREAM_READER 1 + +#include "libavutil/cpu.h" +#include "internal.h" +#include "avcodec.h" +#include "error_resilience.h" +#include "mpegvideo.h" +#include "h263.h" +#include "h263_parser.h" +#include "mpeg4video_parser.h" +#include "msmpeg4.h" +#include "vdpau_internal.h" +#include "thread.h" +#include "flv.h" +#include "mpeg4video.h" + +//#define DEBUG +//#define PRINT_FRAME_TIME + +av_cold int ff_h263_decode_init(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + int ret; + + s->avctx = avctx; + s->out_format = FMT_H263; + + s->width = avctx->coded_width; + s->height = avctx->coded_height; + s->workaround_bugs= avctx->workaround_bugs; + + // set defaults + ff_MPV_decode_defaults(s); + s->quant_precision=5; + s->decode_mb= ff_h263_decode_mb; + s->low_delay= 1; + if (avctx->codec->id == AV_CODEC_ID_MSS2) + avctx->pix_fmt = AV_PIX_FMT_YUV420P; + else + avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts); + s->unrestricted_mv= 1; + + /* select sub codec */ + switch(avctx->codec->id) { + case AV_CODEC_ID_H263: + case AV_CODEC_ID_H263P: + s->unrestricted_mv= 0; + avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; + break; + case AV_CODEC_ID_MPEG4: + break; + case AV_CODEC_ID_MSMPEG4V1: + s->h263_pred = 1; + s->msmpeg4_version=1; + break; + case AV_CODEC_ID_MSMPEG4V2: + s->h263_pred = 1; + s->msmpeg4_version=2; + break; + case AV_CODEC_ID_MSMPEG4V3: + s->h263_pred = 1; + s->msmpeg4_version=3; + break; + case AV_CODEC_ID_WMV1: + s->h263_pred = 1; + s->msmpeg4_version=4; + break; + case AV_CODEC_ID_WMV2: + s->h263_pred = 1; + s->msmpeg4_version=5; + break; + case AV_CODEC_ID_VC1: + case AV_CODEC_ID_WMV3: + case AV_CODEC_ID_VC1IMAGE: + case AV_CODEC_ID_WMV3IMAGE: + case AV_CODEC_ID_MSS2: + s->h263_pred = 1; + s->msmpeg4_version=6; + avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; + break; + case AV_CODEC_ID_H263I: + break; + case AV_CODEC_ID_FLV1: + s->h263_flv = 1; + break; + default: + return AVERROR(EINVAL); + } + s->codec_id= avctx->codec->id; + avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); + + /* for h263, we allocate the images after having read the header */ + if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4) + if ((ret = ff_MPV_common_init(s)) < 0) + return ret; + + ff_h263_decode_init_vlc(); + + return 0; +} + +av_cold int ff_h263_decode_end(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + + ff_MPV_common_end(s); + return 0; +} + +/** + * Return the number of bytes consumed for building the current frame. + */ +static int get_consumed_bytes(MpegEncContext *s, int buf_size){ + int pos= (get_bits_count(&s->gb)+7)>>3; + + if(s->divx_packed || s->avctx->hwaccel){ + //we would have to scan through the whole buf to handle the weird reordering ... + return buf_size; + }else if(s->flags&CODEC_FLAG_TRUNCATED){ + pos -= s->parse_context.last_index; + if(pos<0) pos=0; // padding is not really read so this might be -1 + return pos; + }else{ + if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) + if(pos+10>buf_size) pos=buf_size; // oops ;) + + return pos; + } +} + +static int decode_slice(MpegEncContext *s){ + const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F; + const int mb_size= 16>>s->avctx->lowres; + int ret; + + s->last_resync_gb= s->gb; + s->first_slice_line= 1; + + s->resync_mb_x= s->mb_x; + s->resync_mb_y= s->mb_y; + + ff_set_qscale(s, s->qscale); + + if (s->avctx->hwaccel) { + const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; + const uint8_t *end = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end); + skip_bits_long(&s->gb, 8*(end - start)); + return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); + } + + if(s->partitioned_frame){ + const int qscale= s->qscale; + + if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){ + if ((ret = ff_mpeg4_decode_partitions(s)) < 0) + return ret; + } + + /* restore variables which were modified */ + s->first_slice_line=1; + s->mb_x= s->resync_mb_x; + s->mb_y= s->resync_mb_y; + ff_set_qscale(s, qscale); + } + + for(; s->mb_y < s->mb_height; s->mb_y++) { + /* per-row end of slice checks */ + if(s->msmpeg4_version){ + if(s->resync_mb_y + s->slice_height == s->mb_y){ + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); + + return 0; + } + } + + if(s->msmpeg4_version==1){ + s->last_dc[0]= + s->last_dc[1]= + s->last_dc[2]= 128; + } + + ff_init_block_index(s); + for(; s->mb_x < s->mb_width; s->mb_x++) { + int ret; + + ff_update_block_index(s); + + if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ + s->first_slice_line=0; + } + + /* DCT & quantize */ + + s->mv_dir = MV_DIR_FORWARD; + s->mv_type = MV_TYPE_16X16; +// s->mb_skipped = 0; + av_dlog(s, "%d %d %06X\n", + ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); + ret= s->decode_mb(s, s->block); + + if (s->pict_type!=AV_PICTURE_TYPE_B) + ff_h263_update_motion_val(s); + + if(ret<0){ + const int xy= s->mb_x + s->mb_y*s->mb_stride; + if(ret==SLICE_END){ + ff_MPV_decode_mb(s, s->block); + if(s->loop_filter) + ff_h263_loop_filter(s); + + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); + + s->padding_bug_score--; + + if(++s->mb_x >= s->mb_width){ + s->mb_x=0; + ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size); + ff_MPV_report_decode_progress(s); + s->mb_y++; + } + return 0; + }else if(ret==SLICE_NOEND){ + av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask); + return AVERROR_INVALIDDATA; + } + av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask); + + return AVERROR_INVALIDDATA; + } + + ff_MPV_decode_mb(s, s->block); + if(s->loop_filter) + ff_h263_loop_filter(s); + } + + ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size); + ff_MPV_report_decode_progress(s); + + s->mb_x= 0; + } + + av_assert1(s->mb_x==0 && s->mb_y==s->mb_height); + + if(s->codec_id==AV_CODEC_ID_MPEG4 + && (s->workaround_bugs&FF_BUG_AUTODETECT) + && get_bits_left(&s->gb) >= 48 + && show_bits(&s->gb, 24)==0x4010 + && !s->data_partitioning) + s->padding_bug_score+=32; + + /* try to detect the padding bug */ + if( s->codec_id==AV_CODEC_ID_MPEG4 + && (s->workaround_bugs&FF_BUG_AUTODETECT) + && get_bits_left(&s->gb) >=0 + && get_bits_left(&s->gb) < 137 +// && !s->resync_marker + && !s->data_partitioning){ + + const int bits_count= get_bits_count(&s->gb); + const int bits_left = s->gb.size_in_bits - bits_count; + + if(bits_left==0){ + s->padding_bug_score+=16; + } else if(bits_left != 1){ + int v= show_bits(&s->gb, 8); + v|= 0x7F >> (7-(bits_count&7)); + + if(v==0x7F && bits_left<=8) + s->padding_bug_score--; + else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) + s->padding_bug_score+= 4; + else + s->padding_bug_score++; + } + } + + if(s->workaround_bugs&FF_BUG_AUTODETECT){ + if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) + s->workaround_bugs |= FF_BUG_NO_PADDING; + else + s->workaround_bugs &= ~FF_BUG_NO_PADDING; + } + + // handle formats which don't have unique end markers + if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly + int left= get_bits_left(&s->gb); + int max_extra=7; + + /* no markers in M$ crap */ + if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I) + max_extra+= 17; + + /* buggy padding but the frame should still end approximately at the bitstream end */ + if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE))) + max_extra+= 48; + else if((s->workaround_bugs&FF_BUG_NO_PADDING)) + max_extra+= 256*256*256*64; + + if(left>max_extra){ + av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); + } + else if(left<0){ + av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); + }else + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END); + + return 0; + } + + av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", + get_bits_left(&s->gb), + show_bits(&s->gb, 24), s->padding_bug_score); + + ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask); + + return AVERROR_INVALIDDATA; +} + +int ff_h263_decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + MpegEncContext *s = avctx->priv_data; + int ret; + AVFrame *pict = data; + +#ifdef PRINT_FRAME_TIME +uint64_t time= rdtsc(); +#endif + s->flags= avctx->flags; + s->flags2= avctx->flags2; + + /* no supplementary picture */ + if (buf_size == 0) { + /* special case for last picture */ + if (s->low_delay==0 && s->next_picture_ptr) { + if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0) + return ret; + s->next_picture_ptr= NULL; + + *got_frame = 1; + } + + return 0; + } + + if(s->flags&CODEC_FLAG_TRUNCATED){ + int next; + + if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){ + next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); + }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){ + next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); + }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){ + next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); + }else{ + av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); + return AVERROR(EINVAL); + } + + if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) + return buf_size; + } + + +retry: + if(s->divx_packed && s->bitstream_buffer_size){ + int i; + for(i=0; i<buf_size-3; i++){ + if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){ + if(buf[i+3]==0xB0){ + av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n"); + s->bitstream_buffer_size=0; + } + break; + } + } + } + + if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder + init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); + }else + init_get_bits(&s->gb, buf, buf_size*8); + s->bitstream_buffer_size=0; + + if (!s->context_initialized) { + if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix + return ret; + } + + /* We need to set current_picture_ptr before reading the header, + * otherwise we cannot store anyting in there */ + if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) { + int i= ff_find_unused_picture(s, 0); + if (i < 0) + return i; + s->current_picture_ptr= &s->picture[i]; + } + + /* let's go :-) */ + if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { + ret= ff_wmv2_decode_picture_header(s); + } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { + ret = ff_msmpeg4_decode_picture_header(s); + } else if (CONFIG_MPEG4_DECODER && s->h263_pred) { + if(s->avctx->extradata_size && s->picture_number==0){ + GetBitContext gb; + + init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); + ret = ff_mpeg4_decode_picture_header(s, &gb); + } + ret = ff_mpeg4_decode_picture_header(s, &s->gb); + } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) { + ret = ff_intel_h263_decode_picture_header(s); + } else if (CONFIG_FLV_DECODER && s->h263_flv) { + ret = ff_flv_decode_picture_header(s); + } else { + ret = ff_h263_decode_picture_header(s); + } + + if (ret < 0 || ret==FRAME_SKIPPED) { + if ( s->width != avctx->coded_width + || s->height != avctx->coded_height) { + av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n"); + s->width = avctx->coded_width; + s->height= avctx->coded_height; + } + } + if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); + + /* skip if the header was thrashed */ + if (ret < 0){ + av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); + return ret; + } + + avctx->has_b_frames= !s->low_delay; + + if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ + if(s->stream_codec_tag == AV_RL32("XVID") || + s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || + s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") || + s->codec_tag == AV_RL32("SIPP") + ) + s->xvid_build= 0; +#if 0 + if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 + && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc + s->xvid_build= 0; +#endif + } + + if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ + if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) + s->divx_version= 400; //divx 4 + } + + if(s->xvid_build>=0 && s->divx_version>=0){ + s->divx_version= + s->divx_build= -1; + } + + if(s->workaround_bugs&FF_BUG_AUTODETECT){ + if(s->codec_tag == AV_RL32("XVIX")) + s->workaround_bugs|= FF_BUG_XVID_ILACE; + + if(s->codec_tag == AV_RL32("UMP4")){ + s->workaround_bugs|= FF_BUG_UMP4; + } + + if(s->divx_version>=500 && s->divx_build<1814){ + s->workaround_bugs|= FF_BUG_QPEL_CHROMA; + } + + if(s->divx_version>502 && s->divx_build<1814){ + s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; + } + + if(s->xvid_build<=3U) + s->padding_bug_score= 256*256*256*64; + + if(s->xvid_build<=1U) + s->workaround_bugs|= FF_BUG_QPEL_CHROMA; + + if(s->xvid_build<=12U) + s->workaround_bugs|= FF_BUG_EDGE; + + if(s->xvid_build<=32U) + s->workaround_bugs|= FF_BUG_DC_CLIP; + +#define SET_QPEL_FUNC(postfix1, postfix2) \ + s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\ + s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\ + s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2; + + if(s->lavc_build<4653U) + s->workaround_bugs|= FF_BUG_STD_QPEL; + + if(s->lavc_build<4655U) + s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; + + if(s->lavc_build<4670U){ + s->workaround_bugs|= FF_BUG_EDGE; + } + + if(s->lavc_build<=4712U) + s->workaround_bugs|= FF_BUG_DC_CLIP; + + if(s->divx_version>=0) + s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE; + if(s->divx_version==501 && s->divx_build==20020416) + s->padding_bug_score= 256*256*256*64; + + if(s->divx_version<500U){ + s->workaround_bugs|= FF_BUG_EDGE; + } + + if(s->divx_version>=0) + s->workaround_bugs|= FF_BUG_HPEL_CHROMA; +#if 0 + if(s->divx_version==500) + s->padding_bug_score= 256*256*256*64; + + /* very ugly XVID padding bug detection FIXME/XXX solve this differently + * Let us hope this at least works. + */ + if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1 + && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0) + s->workaround_bugs|= FF_BUG_NO_PADDING; + + if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok + s->workaround_bugs|= FF_BUG_NO_PADDING; +#endif + } + + if(s->workaround_bugs& FF_BUG_STD_QPEL){ + SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c) + + SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c) + SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c) + } + + if(avctx->debug & FF_DEBUG_BUGS) + av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", + s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build, + s->divx_packed ? "p" : ""); + +#if HAVE_MMX + if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) { + avctx->idct_algo= FF_IDCT_XVIDMMX; + ff_dct_common_init(s); + goto retry; + } +#endif + + /* After H263 & mpeg4 header decode we have the height, width,*/ + /* and other parameters. So then we could init the picture */ + /* FIXME: By the way H263 decoder is evolving it should have */ + /* an H263EncContext */ + + if ((!avctx->coded_width || !avctx->coded_height) && 0) { + ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat + + s->parse_context.buffer=0; + ff_MPV_common_end(s); + s->parse_context= pc; + avcodec_set_dimensions(avctx, s->width, s->height); + + goto retry; + } + + if (s->width != avctx->coded_width || + s->height != avctx->coded_height || + s->context_reinit) { + /* H.263 could change picture size any time */ + s->context_reinit = 0; + + avcodec_set_dimensions(avctx, s->width, s->height); + + if ((ret = ff_MPV_common_frame_size_change(s))) + return ret; + } + + if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I)) + s->gob_index = ff_h263_get_gob_height(s); + + // for skipping the frame + s->current_picture.f.pict_type = s->pict_type; + s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I; + + /* skip B-frames if we don't have reference frames */ + if (s->last_picture_ptr == NULL && + (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) + return get_consumed_bytes(s, buf_size); + if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B) + || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I) + || avctx->skip_frame >= AVDISCARD_ALL) + return get_consumed_bytes(s, buf_size); + + if(s->next_p_frame_damaged){ + if(s->pict_type==AV_PICTURE_TYPE_B) + return get_consumed_bytes(s, buf_size); + else + s->next_p_frame_damaged=0; + } + + if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){ + s->me.qpel_put= s->dsp.put_qpel_pixels_tab; + s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; + }else{ + s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab; + s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab; + } + + if ((ret = ff_MPV_frame_start(s, avctx)) < 0) + return ret; + + if (!s->divx_packed && !avctx->hwaccel) + ff_thread_finish_setup(avctx); + + if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) { + ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer); + goto frame_end; + } + + if (avctx->hwaccel) { + if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0) + return ret; + } + + ff_mpeg_er_frame_start(s); + + //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type + //which is not available before ff_MPV_frame_start() + if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){ + ret = ff_wmv2_decode_secondary_picture_header(s); + if(ret<0) return ret; + if(ret==1) goto intrax8_decoded; + } + + /* decode each macroblock */ + s->mb_x=0; + s->mb_y=0; + + ret = decode_slice(s); + while(s->mb_y<s->mb_height){ + if(s->msmpeg4_version){ + if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0) + break; + }else{ + int prev_x=s->mb_x, prev_y=s->mb_y; + if(ff_h263_resync(s)<0) + break; + if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x) + s->er.error_occurred = 1; + } + + if(s->msmpeg4_version<4 && s->h263_pred) + ff_mpeg4_clean_buffers(s); + + if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA; + } + + if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I) + if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){ + s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR; + } + + av_assert1(s->bitstream_buffer_size==0); +frame_end: + /* divx 5.01+ bitstream reorder stuff */ + if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){ + int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3); + int startcode_found=0; + + if(buf_size - current_pos > 7){ + int i; + for(i=current_pos; i<buf_size-4; i++){ + if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ + startcode_found=!(buf[i+4]&0x40); + break; + } + } + } + + if(startcode_found){ + av_fast_malloc( + &s->bitstream_buffer, + &s->allocated_bitstream_buffer_size, + buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE); + if (!s->bitstream_buffer) + return AVERROR(ENOMEM); + memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); + s->bitstream_buffer_size= buf_size - current_pos; + } + } + +intrax8_decoded: + ff_er_frame_end(&s->er); + + if (avctx->hwaccel) { + if ((ret = avctx->hwaccel->end_frame(avctx)) < 0) + return ret; + } + + ff_MPV_frame_end(s); + + if (!s->divx_packed && avctx->hwaccel) + ff_thread_finish_setup(avctx); + + av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type); + av_assert1(s->current_picture.f.pict_type == s->pict_type); + if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { + if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0) + return ret; + ff_print_debug_info(s, s->current_picture_ptr, pict); + ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1); + } else if (s->last_picture_ptr != NULL) { + if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0) + return ret; + ff_print_debug_info(s, s->last_picture_ptr, pict); + ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1); + } + + if(s->last_picture_ptr || s->low_delay){ + *got_frame = 1; + } + +#ifdef PRINT_FRAME_TIME +av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); +#endif + + return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size); +} + +const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = { +#if CONFIG_VAAPI + AV_PIX_FMT_VAAPI_VLD, +#endif +#if CONFIG_VDPAU + AV_PIX_FMT_VDPAU, +#endif + AV_PIX_FMT_YUV420P, + AV_PIX_FMT_NONE +}; + +AVCodec ff_h263_decoder = { + .name = "h263", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_H263, + .priv_data_size = sizeof(MpegEncContext), + .init = ff_h263_decode_init, + .close = ff_h263_decode_end, + .decode = ff_h263_decode_frame, + .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | + CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, + .flush = ff_mpeg_flush, + .max_lowres = 3, + .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), + .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, +}; + +AVCodec ff_h263p_decoder = { + .name = "h263p", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_H263P, + .priv_data_size = sizeof(MpegEncContext), + .init = ff_h263_decode_init, + .close = ff_h263_decode_end, + .decode = ff_h263_decode_frame, + .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | + CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, + .flush = ff_mpeg_flush, + .max_lowres = 3, + .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"), + .pix_fmts = ff_h263_hwaccel_pixfmt_list_420, +};