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762 lines
25 KiB
762 lines
25 KiB
/* |
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* H.263 decoder |
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* Copyright (c) 2001 Fabrice Bellard |
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* H.263 decoder. |
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*/ |
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|
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#include "libavutil/cpu.h" |
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#include "internal.h" |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "mpegvideo.h" |
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#include "h263.h" |
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#include "h263_parser.h" |
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#include "mpeg4video_parser.h" |
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#include "msmpeg4.h" |
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#include "vdpau_internal.h" |
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#include "flv.h" |
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#include "mpeg4video.h" |
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|
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//#define DEBUG |
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//#define PRINT_FRAME_TIME |
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av_cold int ff_h263_decode_init(AVCodecContext *avctx) |
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{ |
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MpegEncContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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s->out_format = FMT_H263; |
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s->width = avctx->coded_width; |
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s->height = avctx->coded_height; |
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s->workaround_bugs= avctx->workaround_bugs; |
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|
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// set defaults |
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MPV_decode_defaults(s); |
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s->quant_precision=5; |
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s->decode_mb= ff_h263_decode_mb; |
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s->low_delay= 1; |
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avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts); |
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s->unrestricted_mv= 1; |
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|
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/* select sub codec */ |
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switch(avctx->codec->id) { |
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case CODEC_ID_H263: |
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s->unrestricted_mv= 0; |
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avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; |
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break; |
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case CODEC_ID_MPEG4: |
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break; |
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case CODEC_ID_MSMPEG4V1: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=1; |
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break; |
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case CODEC_ID_MSMPEG4V2: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=2; |
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break; |
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case CODEC_ID_MSMPEG4V3: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=3; |
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break; |
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case CODEC_ID_WMV1: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=4; |
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break; |
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case CODEC_ID_WMV2: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=5; |
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break; |
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case CODEC_ID_VC1: |
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case CODEC_ID_WMV3: |
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s->h263_msmpeg4 = 1; |
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s->h263_pred = 1; |
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s->msmpeg4_version=6; |
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avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; |
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break; |
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case CODEC_ID_H263I: |
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break; |
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case CODEC_ID_FLV1: |
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s->h263_flv = 1; |
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break; |
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default: |
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return -1; |
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} |
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s->codec_id= avctx->codec->id; |
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avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt); |
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|
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/* for h263, we allocate the images after having read the header */ |
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if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) |
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if (MPV_common_init(s) < 0) |
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return -1; |
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h263_decode_init_vlc(s); |
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return 0; |
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} |
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av_cold int ff_h263_decode_end(AVCodecContext *avctx) |
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{ |
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MpegEncContext *s = avctx->priv_data; |
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MPV_common_end(s); |
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return 0; |
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} |
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/** |
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* returns the number of bytes consumed for building the current frame |
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*/ |
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static int get_consumed_bytes(MpegEncContext *s, int buf_size){ |
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int pos= (get_bits_count(&s->gb)+7)>>3; |
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if(s->divx_packed || s->avctx->hwaccel){ |
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//we would have to scan through the whole buf to handle the weird reordering ... |
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return buf_size; |
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}else if(s->flags&CODEC_FLAG_TRUNCATED){ |
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pos -= s->parse_context.last_index; |
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if(pos<0) pos=0; // padding is not really read so this might be -1 |
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return pos; |
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}else{ |
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if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...) |
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if(pos+10>buf_size) pos=buf_size; // oops ;) |
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return pos; |
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} |
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} |
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static int decode_slice(MpegEncContext *s){ |
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const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F; |
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const int mb_size= 16>>s->avctx->lowres; |
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s->last_resync_gb= s->gb; |
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s->first_slice_line= 1; |
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s->resync_mb_x= s->mb_x; |
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s->resync_mb_y= s->mb_y; |
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ff_set_qscale(s, s->qscale); |
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if (s->avctx->hwaccel) { |
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const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8; |
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const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end); |
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skip_bits_long(&s->gb, 8*(end - start)); |
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return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start); |
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} |
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if(s->partitioned_frame){ |
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const int qscale= s->qscale; |
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if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ |
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if(ff_mpeg4_decode_partitions(s) < 0) |
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return -1; |
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} |
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/* restore variables which were modified */ |
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s->first_slice_line=1; |
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s->mb_x= s->resync_mb_x; |
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s->mb_y= s->resync_mb_y; |
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ff_set_qscale(s, qscale); |
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} |
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for(; s->mb_y < s->mb_height; s->mb_y++) { |
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/* per-row end of slice checks */ |
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if(s->msmpeg4_version){ |
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if(s->resync_mb_y + s->slice_height == s->mb_y){ |
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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); |
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return 0; |
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} |
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} |
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if(s->msmpeg4_version==1){ |
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s->last_dc[0]= |
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s->last_dc[1]= |
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s->last_dc[2]= 128; |
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} |
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ff_init_block_index(s); |
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for(; s->mb_x < s->mb_width; s->mb_x++) { |
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int ret; |
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ff_update_block_index(s); |
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if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){ |
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s->first_slice_line=0; |
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} |
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/* DCT & quantize */ |
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s->mv_dir = MV_DIR_FORWARD; |
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s->mv_type = MV_TYPE_16X16; |
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// s->mb_skipped = 0; |
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//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24)); |
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ret= s->decode_mb(s, s->block); |
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if (s->pict_type!=FF_B_TYPE) |
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ff_h263_update_motion_val(s); |
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if(ret<0){ |
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const int xy= s->mb_x + s->mb_y*s->mb_stride; |
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if(ret==SLICE_END){ |
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MPV_decode_mb(s, s->block); |
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if(s->loop_filter) |
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ff_h263_loop_filter(s); |
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//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)); |
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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); |
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s->padding_bug_score--; |
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if(++s->mb_x >= s->mb_width){ |
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s->mb_x=0; |
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ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); |
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s->mb_y++; |
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} |
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return 0; |
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}else if(ret==SLICE_NOEND){ |
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av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy); |
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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); |
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return -1; |
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} |
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av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy); |
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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); |
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return -1; |
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} |
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MPV_decode_mb(s, s->block); |
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if(s->loop_filter) |
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ff_h263_loop_filter(s); |
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} |
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ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size); |
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s->mb_x= 0; |
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} |
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assert(s->mb_x==0 && s->mb_y==s->mb_height); |
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if(s->codec_id==CODEC_ID_MPEG4 |
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&& (s->workaround_bugs&FF_BUG_AUTODETECT) |
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&& get_bits_left(&s->gb) >= 48 |
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&& show_bits(&s->gb, 24)==0x4010 |
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&& !s->data_partitioning) |
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s->padding_bug_score+=32; |
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/* try to detect the padding bug */ |
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if( s->codec_id==CODEC_ID_MPEG4 |
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&& (s->workaround_bugs&FF_BUG_AUTODETECT) |
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&& get_bits_left(&s->gb) >=0 |
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&& get_bits_left(&s->gb) < 48 |
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// && !s->resync_marker |
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&& !s->data_partitioning){ |
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const int bits_count= get_bits_count(&s->gb); |
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const int bits_left = s->gb.size_in_bits - bits_count; |
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if(bits_left==0){ |
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s->padding_bug_score+=16; |
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} else if(bits_left != 1){ |
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int v= show_bits(&s->gb, 8); |
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v|= 0x7F >> (7-(bits_count&7)); |
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if(v==0x7F && bits_left<=8) |
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s->padding_bug_score--; |
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else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16) |
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s->padding_bug_score+= 4; |
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else |
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s->padding_bug_score++; |
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} |
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} |
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if(s->workaround_bugs&FF_BUG_AUTODETECT){ |
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if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/) |
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s->workaround_bugs |= FF_BUG_NO_PADDING; |
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else |
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s->workaround_bugs &= ~FF_BUG_NO_PADDING; |
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} |
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// handle formats which don't have unique end markers |
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if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly |
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int left= get_bits_left(&s->gb); |
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int max_extra=7; |
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/* no markers in M$ crap */ |
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if(s->msmpeg4_version && s->pict_type==FF_I_TYPE) |
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max_extra+= 17; |
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/* buggy padding but the frame should still end approximately at the bitstream end */ |
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if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3) |
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max_extra+= 48; |
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else if((s->workaround_bugs&FF_BUG_NO_PADDING)) |
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max_extra+= 256*256*256*64; |
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if(left>max_extra){ |
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av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); |
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} |
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else if(left<0){ |
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av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left); |
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}else |
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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); |
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return 0; |
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} |
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av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", |
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get_bits_left(&s->gb), |
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show_bits(&s->gb, 24), s->padding_bug_score); |
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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); |
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return -1; |
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} |
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int ff_h263_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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MpegEncContext *s = avctx->priv_data; |
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int ret; |
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AVFrame *pict = data; |
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#ifdef PRINT_FRAME_TIME |
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uint64_t time= rdtsc(); |
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#endif |
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s->flags= avctx->flags; |
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s->flags2= avctx->flags2; |
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/* no supplementary picture */ |
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if (buf_size == 0) { |
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/* special case for last picture */ |
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if (s->low_delay==0 && s->next_picture_ptr) { |
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*pict= *(AVFrame*)s->next_picture_ptr; |
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s->next_picture_ptr= NULL; |
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*data_size = sizeof(AVFrame); |
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} |
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return 0; |
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} |
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if(s->flags&CODEC_FLAG_TRUNCATED){ |
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int next; |
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if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){ |
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next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size); |
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}else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){ |
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next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size); |
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}else{ |
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av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n"); |
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return -1; |
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} |
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if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 ) |
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return buf_size; |
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} |
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retry: |
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if(s->divx_packed && s->xvid_build>=0 && s->bitstream_buffer_size){ |
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int i; |
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for(i=0; i<buf_size-3; i++){ |
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if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){ |
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if(buf[i+3]==0xB0) |
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s->bitstream_buffer_size=0; |
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break; |
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} |
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} |
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} |
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if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder |
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init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8); |
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}else |
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init_get_bits(&s->gb, buf, buf_size*8); |
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s->bitstream_buffer_size=0; |
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if (!s->context_initialized) { |
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if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix |
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return -1; |
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} |
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|
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/* We need to set current_picture_ptr before reading the header, |
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* otherwise we cannot store anyting in there */ |
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if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){ |
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int i= ff_find_unused_picture(s, 0); |
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s->current_picture_ptr= &s->picture[i]; |
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} |
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/* let's go :-) */ |
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if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) { |
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ret= ff_wmv2_decode_picture_header(s); |
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} else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) { |
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ret = msmpeg4_decode_picture_header(s); |
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} else if (CONFIG_MPEG4_DECODER && s->h263_pred) { |
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if(s->avctx->extradata_size && s->picture_number==0){ |
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GetBitContext gb; |
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|
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init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); |
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ret = ff_mpeg4_decode_picture_header(s, &gb); |
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} |
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ret = ff_mpeg4_decode_picture_header(s, &s->gb); |
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} else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) { |
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ret = ff_intel_h263_decode_picture_header(s); |
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} else if (CONFIG_FLV_DECODER && s->h263_flv) { |
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ret = ff_flv_decode_picture_header(s); |
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} else { |
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ret = h263_decode_picture_header(s); |
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} |
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if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size); |
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/* skip if the header was thrashed */ |
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if (ret < 0){ |
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av_log(s->avctx, AV_LOG_ERROR, "header damaged\n"); |
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return -1; |
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} |
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avctx->has_b_frames= !s->low_delay; |
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if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ |
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if(s->stream_codec_tag == AV_RL32("XVID") || |
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s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") || |
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s->codec_tag == AV_RL32("RMP4") || |
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s->codec_tag == AV_RL32("SIPP") |
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) |
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s->xvid_build= 0; |
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#if 0 |
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if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1 |
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&& s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc |
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s->xvid_build= 0; |
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#endif |
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} |
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if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){ |
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if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0) |
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s->divx_version= 400; //divx 4 |
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} |
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if(s->xvid_build>=0 && s->divx_version>=0){ |
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s->divx_version= |
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s->divx_build= -1; |
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} |
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if(s->workaround_bugs&FF_BUG_AUTODETECT){ |
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if(s->codec_tag == AV_RL32("XVIX")) |
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s->workaround_bugs|= FF_BUG_XVID_ILACE; |
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|
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if(s->codec_tag == AV_RL32("UMP4")){ |
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s->workaround_bugs|= FF_BUG_UMP4; |
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} |
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if(s->divx_version>=500 && s->divx_build<1814){ |
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s->workaround_bugs|= FF_BUG_QPEL_CHROMA; |
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} |
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if(s->divx_version>502 && s->divx_build<1814){ |
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s->workaround_bugs|= FF_BUG_QPEL_CHROMA2; |
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} |
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if(s->xvid_build<=3U) |
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s->padding_bug_score= 256*256*256*64; |
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|
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if(s->xvid_build<=1U) |
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s->workaround_bugs|= FF_BUG_QPEL_CHROMA; |
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|
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if(s->xvid_build<=12U) |
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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; |
|
//printf("padding_bug_score: %d\n", s->padding_bug_score); |
|
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==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 0 // dump bits per frame / qp / complexity |
|
{ |
|
static FILE *f=NULL; |
|
if(!f) f=fopen("rate_qp_cplx.txt", "w"); |
|
fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale); |
|
} |
|
#endif |
|
|
|
#if HAVE_MMX |
|
if (s->codec_id == 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; |
|
avctx->coded_width= 0; // force reinit |
|
// dsputil_init(&s->dsp, avctx); |
|
s->picture_number=0; |
|
} |
|
#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 ( s->width != avctx->coded_width |
|
|| s->height != avctx->coded_height) { |
|
/* H.263 could change picture size any time */ |
|
ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat |
|
s->parse_context.buffer=0; |
|
MPV_common_end(s); |
|
s->parse_context= pc; |
|
} |
|
if (!s->context_initialized) { |
|
avcodec_set_dimensions(avctx, s->width, s->height); |
|
|
|
goto retry; |
|
} |
|
|
|
if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I)) |
|
s->gob_index = ff_h263_get_gob_height(s); |
|
|
|
// for hurry_up==5 |
|
s->current_picture.pict_type= s->pict_type; |
|
s->current_picture.key_frame= s->pict_type == FF_I_TYPE; |
|
|
|
/* skip B-frames if we don't have reference frames */ |
|
if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size); |
|
/* skip b frames if we are in a hurry */ |
|
if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size); |
|
if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE) |
|
|| (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE) |
|
|| avctx->skip_frame >= AVDISCARD_ALL) |
|
return get_consumed_bytes(s, buf_size); |
|
/* skip everything if we are in a hurry>=5 */ |
|
if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size); |
|
|
|
if(s->next_p_frame_damaged){ |
|
if(s->pict_type==FF_B_TYPE) |
|
return get_consumed_bytes(s, buf_size); |
|
else |
|
s->next_p_frame_damaged=0; |
|
} |
|
|
|
if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){ |
|
s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab; |
|
s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab; |
|
}else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){ |
|
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(MPV_frame_start(s, avctx) < 0) |
|
return -1; |
|
|
|
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 (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0) |
|
return -1; |
|
} |
|
|
|
ff_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 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; |
|
|
|
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_count(&s->gb) > s->gb.size_in_bits) |
|
break; |
|
}else{ |
|
if(ff_h263_resync(s)<0) |
|
break; |
|
} |
|
|
|
if(s->msmpeg4_version<4 && s->h263_pred) |
|
ff_mpeg4_clean_buffers(s); |
|
|
|
decode_slice(s); |
|
} |
|
|
|
if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE) |
|
if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){ |
|
s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR; |
|
} |
|
|
|
assert(s->bitstream_buffer_size==0); |
|
frame_end: |
|
/* divx 5.01+ bistream reorder stuff */ |
|
if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){ |
|
int current_pos= get_bits_count(&s->gb)>>3; |
|
int startcode_found=0; |
|
|
|
if(buf_size - current_pos > 5){ |
|
int i; |
|
for(i=current_pos; i<buf_size-3; i++){ |
|
if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){ |
|
startcode_found=1; |
|
break; |
|
} |
|
} |
|
} |
|
if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style |
|
startcode_found=1; |
|
current_pos=0; |
|
} |
|
|
|
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); |
|
|
|
if (avctx->hwaccel) { |
|
if (avctx->hwaccel->end_frame(avctx) < 0) |
|
return -1; |
|
} |
|
|
|
MPV_frame_end(s); |
|
|
|
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type); |
|
assert(s->current_picture.pict_type == s->pict_type); |
|
if (s->pict_type == FF_B_TYPE || s->low_delay) { |
|
*pict= *(AVFrame*)s->current_picture_ptr; |
|
} else if (s->last_picture_ptr != NULL) { |
|
*pict= *(AVFrame*)s->last_picture_ptr; |
|
} |
|
|
|
if(s->last_picture_ptr || s->low_delay){ |
|
*data_size = sizeof(AVFrame); |
|
ff_print_debug_info(s, pict); |
|
} |
|
|
|
#ifdef PRINT_FRAME_TIME |
|
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time); |
|
#endif |
|
|
|
return get_consumed_bytes(s, buf_size); |
|
} |
|
|
|
AVCodec ff_h263_decoder = { |
|
"h263", |
|
AVMEDIA_TYPE_VIDEO, |
|
CODEC_ID_H263, |
|
sizeof(MpegEncContext), |
|
ff_h263_decode_init, |
|
NULL, |
|
ff_h263_decode_end, |
|
ff_h263_decode_frame, |
|
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_hwaccel_pixfmt_list_420, |
|
};
|
|
|