mirror of
https://github.com/FFmpeg/FFmpeg.git
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267f7edcd1
taken from a patch by Steve L'Homme Originally committed as revision 5127 to svn://svn.ffmpeg.org/ffmpeg/trunk
897 lines
27 KiB
C
897 lines
27 KiB
C
/*
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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* @file h263dec.c
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* H.263 decoder.
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*/
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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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//#define DEBUG
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//#define PRINT_FRAME_TIME
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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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// 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= PIX_FMT_YUV420P;
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s->unrestricted_mv= 1;
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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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break;
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case CODEC_ID_MPEG4:
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s->decode_mb= ff_mpeg4_decode_mb;
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s->time_increment_bits = 4; /* default value for broken headers */
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s->h263_pred = 1;
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s->low_delay = 0; //default, might be overriden in the vol header during header parsing
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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_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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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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/* 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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if (s->h263_msmpeg4)
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ff_msmpeg4_decode_init(s);
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else
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h263_decode_init_vlc(s);
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return 0;
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}
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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){
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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 thats 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->partitioned_frame){
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const int qscale= s->qscale;
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if(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!=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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/* 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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&& s->gb.size_in_bits - get_bits_count(&s->gb) >=0
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&& s->gb.size_in_bits - get_bits_count(&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 || !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= s->gb.size_in_bits - get_bits_count(&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==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_resilience>=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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s->gb.size_in_bits - get_bits_count(&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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/**
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* finds the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
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int vop_found, i;
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uint32_t state;
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vop_found= pc->frame_start_found;
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state= pc->state;
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i=0;
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if(!vop_found){
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for(i=0; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state == 0x1B6){
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i++;
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vop_found=1;
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break;
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}
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}
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}
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if(vop_found){
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/* EOF considered as end of frame */
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if (buf_size == 0)
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return 0;
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for(; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if((state&0xFFFFFF00) == 0x100){
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pc->frame_start_found=0;
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pc->state=-1;
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return i-3;
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}
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}
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}
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pc->frame_start_found= vop_found;
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pc->state= state;
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return END_NOT_FOUND;
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}
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static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
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int vop_found, i;
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uint32_t state;
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vop_found= pc->frame_start_found;
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state= pc->state;
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i=0;
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if(!vop_found){
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for(i=0; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state>>(32-22) == 0x20){
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i++;
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vop_found=1;
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break;
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}
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}
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}
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if(vop_found){
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for(; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state>>(32-22) == 0x20){
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pc->frame_start_found=0;
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pc->state=-1;
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return i-3;
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}
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}
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}
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pc->frame_start_found= vop_found;
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pc->state= state;
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return END_NOT_FOUND;
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}
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static int h263_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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ParseContext *pc = s->priv_data;
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int next;
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next= h263_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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*poutbuf = (uint8_t *)buf;
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*poutbuf_size = buf_size;
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return next;
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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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uint8_t *buf, int buf_size)
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{
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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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#ifdef DEBUG
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printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
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printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
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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(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(s->codec_id==CODEC_ID_H263){
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next= 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, &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->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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//we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
|
|
if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
|
|
int i= ff_find_unused_picture(s, 0);
|
|
s->current_picture_ptr= &s->picture[i];
|
|
}
|
|
|
|
/* let's go :-) */
|
|
if (s->msmpeg4_version==5) {
|
|
ret= ff_wmv2_decode_picture_header(s);
|
|
} else if (s->msmpeg4_version) {
|
|
ret = msmpeg4_decode_picture_header(s);
|
|
} else if (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);
|
|
|
|
if(s->flags& CODEC_FLAG_LOW_DELAY)
|
|
s->low_delay=1;
|
|
} else if (s->codec_id == CODEC_ID_H263I) {
|
|
ret = intel_h263_decode_picture_header(s);
|
|
} else if (s->h263_flv) {
|
|
ret = flv_h263_decode_picture_header(s);
|
|
} else {
|
|
ret = h263_decode_picture_header(s);
|
|
}
|
|
|
|
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 -1;
|
|
}
|
|
|
|
avctx->has_b_frames= !s->low_delay;
|
|
|
|
if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
|
|
if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
|
|
s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX") ||
|
|
s->avctx->codec_tag == ff_get_fourcc("RMP4"))
|
|
s->xvid_build= -1;
|
|
#if 0
|
|
if(s->avctx->codec_tag == ff_get_fourcc("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= -1;
|
|
#endif
|
|
}
|
|
|
|
if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
|
|
if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
|
|
s->divx_version= 400; //divx 4
|
|
}
|
|
|
|
if(s->xvid_build && s->divx_version){
|
|
s->divx_version=
|
|
s->divx_build= 0;
|
|
}
|
|
|
|
if(s->workaround_bugs&FF_BUG_AUTODETECT){
|
|
if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
|
|
s->workaround_bugs|= FF_BUG_XVID_ILACE;
|
|
|
|
if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
|
|
s->workaround_bugs|= FF_BUG_UMP4;
|
|
}
|
|
|
|
if(s->divx_version>=500){
|
|
s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
|
|
}
|
|
|
|
if(s->divx_version>502){
|
|
s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
|
|
}
|
|
|
|
if(s->xvid_build && s->xvid_build<=3)
|
|
s->padding_bug_score= 256*256*256*64;
|
|
|
|
if(s->xvid_build && s->xvid_build<=1)
|
|
s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
|
|
|
|
if(s->xvid_build && s->xvid_build<=12)
|
|
s->workaround_bugs|= FF_BUG_EDGE;
|
|
|
|
if(s->xvid_build && s->xvid_build<=32)
|
|
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 && s->lavc_build<4653)
|
|
s->workaround_bugs|= FF_BUG_STD_QPEL;
|
|
|
|
if(s->lavc_build && s->lavc_build<4655)
|
|
s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
|
|
|
|
if(s->lavc_build && s->lavc_build<4670){
|
|
s->workaround_bugs|= FF_BUG_EDGE;
|
|
}
|
|
|
|
if(s->lavc_build && s->lavc_build<=4712)
|
|
s->workaround_bugs|= FF_BUG_DC_CLIP;
|
|
|
|
if(s->divx_version)
|
|
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 && s->divx_version<500){
|
|
s->workaround_bugs|= FF_BUG_EDGE;
|
|
}
|
|
|
|
if(s->divx_version)
|
|
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
|
|
* lets hope this at least works
|
|
*/
|
|
if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
|
|
&& s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
|
|
s->workaround_bugs|= FF_BUG_NO_PADDING;
|
|
|
|
if(s->lavc_build && s->lavc_build<4609) //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 defined(HAVE_MMX) && defined(CONFIG_GPL)
|
|
if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_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->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 == I_TYPE;
|
|
|
|
/* skip B-frames if we don't have reference frames */
|
|
if(s->last_picture_ptr==NULL && (s->pict_type==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==B_TYPE) return get_consumed_bytes(s, buf_size);
|
|
if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
|
|
|| (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=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==B_TYPE)
|
|
return get_consumed_bytes(s, buf_size);
|
|
else
|
|
s->next_p_frame_damaged=0;
|
|
}
|
|
|
|
if(MPV_frame_start(s, avctx) < 0)
|
|
return -1;
|
|
|
|
#ifdef DEBUG
|
|
av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
|
|
#endif
|
|
|
|
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 isnt available before MPV_frame_start()
|
|
if (s->msmpeg4_version==5){
|
|
if(ff_wmv2_decode_secondary_picture_header(s) < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* 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->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==I_TYPE)
|
|
if(msmpeg4_decode_ext_header(s, buf_size) < 0){
|
|
s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
|
|
}
|
|
|
|
/* divx 5.01+ bistream reorder stuff */
|
|
if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && 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>20){ //xvid style
|
|
startcode_found=1;
|
|
current_pos=0;
|
|
}
|
|
|
|
if(startcode_found){
|
|
s->bitstream_buffer= av_fast_realloc(
|
|
s->bitstream_buffer,
|
|
&s->allocated_bitstream_buffer_size,
|
|
buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
|
|
s->bitstream_buffer_size= buf_size - current_pos;
|
|
}
|
|
}
|
|
|
|
ff_er_frame_end(s);
|
|
|
|
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==B_TYPE || s->low_delay){
|
|
*pict= *(AVFrame*)&s->current_picture;
|
|
ff_print_debug_info(s, pict);
|
|
} else {
|
|
*pict= *(AVFrame*)&s->last_picture;
|
|
if(pict)
|
|
ff_print_debug_info(s, pict);
|
|
}
|
|
|
|
/* Return the Picture timestamp as the frame number */
|
|
/* we substract 1 because it is added on utils.c */
|
|
avctx->frame_number = s->picture_number - 1;
|
|
|
|
/* don't output the last pic after seeking */
|
|
if(s->last_picture_ptr || s->low_delay)
|
|
*data_size = sizeof(AVFrame);
|
|
#ifdef PRINT_FRAME_TIME
|
|
av_log(avctx, AV_LOG_DEBUG, "%Ld\n", rdtsc()-time);
|
|
#endif
|
|
|
|
return get_consumed_bytes(s, buf_size);
|
|
}
|
|
|
|
AVCodec mpeg4_decoder = {
|
|
"mpeg4",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG4,
|
|
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,
|
|
};
|
|
|
|
AVCodec h263_decoder = {
|
|
"h263",
|
|
CODEC_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,
|
|
};
|
|
|
|
AVCodec msmpeg4v1_decoder = {
|
|
"msmpeg4v1",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MSMPEG4V1,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec msmpeg4v2_decoder = {
|
|
"msmpeg4v2",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MSMPEG4V2,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec msmpeg4v3_decoder = {
|
|
"msmpeg4",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MSMPEG4V3,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec wmv1_decoder = {
|
|
"wmv1",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_WMV1,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec h263i_decoder = {
|
|
"h263i",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_H263I,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec flv_decoder = {
|
|
"flv",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_FLV1,
|
|
sizeof(MpegEncContext),
|
|
ff_h263_decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
|
|
};
|
|
|
|
AVCodecParser h263_parser = {
|
|
{ CODEC_ID_H263 },
|
|
sizeof(ParseContext),
|
|
NULL,
|
|
h263_parse,
|
|
ff_parse_close,
|
|
};
|