summaryrefslogtreecommitdiffstats
path: root/demux_avi.c
diff options
context:
space:
mode:
authorarpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2>2001-08-08 19:37:45 +0000
committerarpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2>2001-08-08 19:37:45 +0000
commit4953243cb403109accd948d86533629cd4de24eb (patch)
tree0bfed078e197733e71e5e06a81f7563c9bb2d709 /demux_avi.c
parent9872ba238bd692b7ea89654e0acd66d9fe1eae94 (diff)
downloadmpv-4953243cb403109accd948d86533629cd4de24eb.tar.bz2
mpv-4953243cb403109accd948d86533629cd4de24eb.tar.xz
format-specific seeking code moved to demuxer_ stuff
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1467 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'demux_avi.c')
-rw-r--r--demux_avi.c142
1 files changed, 142 insertions, 0 deletions
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_pos<demuxer->idx_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;i<video_chunk_pos;i++){
+ int id=((AVIINDEXENTRY *)demuxer->idx)[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;i<video_chunk_pos;i++){
+ int id=((AVIINDEXENTRY *)demuxer->idx)[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;i<video_chunk_pos;i++){
+ int id=((AVIINDEXENTRY *)demuxer->idx)[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;
+
+ }
+
+
+}
+
+