From 4953243cb403109accd948d86533629cd4de24eb Mon Sep 17 00:00:00 2001 From: arpi Date: Wed, 8 Aug 2001 19:37:45 +0000 Subject: format-specific seeking code moved to demuxer_ stuff git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1467 b3059339-0415-0410-9bf9-f77b7e298cf2 --- demux_avi.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) (limited to 'demux_avi.c') diff --git a/demux_avi.c b/demux_avi.c index 36adfeec82..5895ba5104 100644 --- a/demux_avi.c +++ b/demux_avi.c @@ -355,4 +355,146 @@ do{ return 1; } +extern float initial_pts_delay; + +void demux_seek_avi(demuxer_t *demuxer,float rel_seek_secs,int flags){ + demux_stream_t *d_audio=demuxer->audio; + demux_stream_t *d_video=demuxer->video; + sh_audio_t *sh_audio=d_audio->sh; + sh_video_t *sh_video=d_video->sh; + float skip_audio_secs=0; + + //FIXME: OFF_T - Didn't check AVI case yet (avi files can't be >2G anyway?) + //================= seek in AVI ========================== + int rel_seek_frames=rel_seek_secs*sh_video->fps; + int curr_audio_pos=0; + int audio_chunk_pos=-1; + int video_chunk_pos=d_video->pos; + int i; + + skip_video_frames=0; + avi_audio_pts=0; + + // find nearest video keyframe chunk pos: + if(rel_seek_frames>0){ + // seek forward + while(video_chunk_posidx_size){ + int id=((AVIINDEXENTRY *)demuxer->idx)[video_chunk_pos].ckid; + if(avi_stream_id(id)==d_video->id){ // video frame + if((--rel_seek_frames)<0 && ((AVIINDEXENTRY *)demuxer->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break; +// ++skip_audio_bytes; + } + ++video_chunk_pos; + } + } else { + // seek backward + while(video_chunk_pos>=0){ + int id=((AVIINDEXENTRY *)demuxer->idx)[video_chunk_pos].ckid; + if(avi_stream_id(id)==d_video->id){ // video frame + if((++rel_seek_frames)>0 && ((AVIINDEXENTRY *)demuxer->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break; +// --skip_audio_bytes; + } + --video_chunk_pos; + } + } + demuxer->idx_pos_a=demuxer->idx_pos_v=demuxer->idx_pos=video_chunk_pos; +// printf("%d frames skipped\n",skip_audio_bytes); + + // re-calc video pts: + d_video->pack_no=0; + for(i=0;iidx)[i].ckid; + if(avi_stream_id(id)==d_video->id) ++d_video->pack_no; + } + sh_video->num_frames=d_video->pack_no; + avi_video_pts=d_video->pack_no*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate; + + if(sh_audio){ + int i; + int apos=0; + int last=0; + int len=0; + int skip_audio_bytes=0; + + // calc new audio position in audio stream: (using avg.bps value) + curr_audio_pos=(avi_video_pts) * sh_audio->wf->nAvgBytesPerSec; + if(curr_audio_pos<0)curr_audio_pos=0; +#if 1 + curr_audio_pos&=~15; // requires for PCM formats!!! +#else + curr_audio_pos/=sh_audio->wf->nBlockAlign; + curr_audio_pos*=sh_audio->wf->nBlockAlign; + demuxer->audio_seekable=1; +#endif + + // find audio chunk pos: + for(i=0;iidx)[i].ckid; + if(avi_stream_id(id)==d_audio->id){ + len=((AVIINDEXENTRY *)demuxer->idx)[i].dwChunkLength; + last=i; + if(apos<=curr_audio_pos && curr_audio_pos<(apos+len)){ + if(verbose)printf("break;\n"); + break; + } + apos+=len; + } + } + if(verbose)printf("XXX i=%d last=%d apos=%d curr_audio_pos=%d \n", + i,last,apos,curr_audio_pos); +// audio_chunk_pos=last; // maybe wrong (if not break; ) + audio_chunk_pos=i; // maybe wrong (if not break; ) + skip_audio_bytes=curr_audio_pos-apos; + + // update stream position: + d_audio->pos=audio_chunk_pos; + d_audio->dpos=apos; + d_audio->pts=initial_pts_delay+(float)apos/(float)sh_audio->wf->nAvgBytesPerSec; + demuxer->idx_pos_a=demuxer->idx_pos_v=demuxer->idx_pos=audio_chunk_pos; + + if(!(sh_audio->codec->flags&CODECS_FLAG_SEEKABLE)){ +#if 0 +// curr_audio_pos=apos; // selected audio codec can't seek in chunk + skip_audio_secs=(float)skip_audio_bytes/(float)sh_audio->wf->nAvgBytesPerSec; + //printf("Seek_AUDIO: %d bytes --> %5.3f secs\n",skip_audio_bytes,skip_audio_secs); + skip_audio_bytes=0; +#else + int d=skip_audio_bytes % sh_audio->wf->nBlockAlign; + skip_audio_bytes-=d; +// curr_audio_pos-=d; + skip_audio_secs=(float)d/(float)sh_audio->wf->nAvgBytesPerSec; + //printf("Seek_AUDIO: %d bytes --> %5.3f secs\n",d,skip_audio_secs); +#endif + } + // now: audio_chunk_pos=pos in index + // skip_audio_bytes=bytes to skip from that chunk + // skip_audio_secs=time to play audio before video (if can't skip) + + // calc skip_video_frames & adjust video pts counter: +// i=last; + for(i=demuxer->idx_pos;iidx)[i].ckid; + if(avi_stream_id(id)==d_video->id) ++skip_video_frames; + } + // requires for correct audio pts calculation (demuxer): + avi_video_pts-=skip_video_frames*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate; + + if(verbose) printf("SEEK: idx=%d (a:%d v:%d) v.skip=%d a.skip=%d/%4.3f \n", + demuxer->idx_pos,audio_chunk_pos,video_chunk_pos, + skip_video_frames,skip_audio_bytes,skip_audio_secs); + + if(skip_audio_bytes){ + demux_read_data(d_audio,NULL,skip_audio_bytes); + //d_audio->pts=0; // PTS is outdated because of the raw data skipping + } + resync_audio_stream(sh_audio); + + sh_audio->timer=-skip_audio_secs; + + } + + +} + + -- cgit v1.2.3