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using keyframe info for seeking

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2545 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi
2001-10-29 21:55:07 +00:00
parent 4e83a60098
commit 10f5c87656
1 changed files with 20 additions and 9 deletions
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libmpdemux/demux_mov.c
+20 -9
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@@ -71,6 +71,8 @@ typedef struct {
mov_chunkmap_t* chunkmap;
int durmap_size;
mov_durmap_t* durmap;
int keyframes_size;
unsigned int* keyframes;
} mov_track_t;
void mov_build_index(mov_track_t* trak){
@@ -372,15 +374,12 @@ static void lschunks(demuxer_t* demuxer,int level,off_t endpos,mov_track_t* trak
int ver = (temp << 24);
int flags = (temp << 16)|(temp<<8)|temp;
int i;
mp_msg(MSGT_DEMUX, MSGL_V,"MOV: %*sSyncing samples (keyframes) table! (%d entries) (ver:%d,flags:%ld)\n",
level, "",entries, ver, flags);
#if 0
for (i=0;i<entries;i++)
{
printf("entry#%d: %ld\n", i, stream_read_dword(demuxer->stream));
}
#endif
trak->keyframes_size=entries;
trak->keyframes=malloc(sizeof(unsigned int)*entries);
for (i=0;i<entries;i++) trak->keyframes[i]=stream_read_dword(demuxer->stream)-1;
// for (i=0;i<entries;i++) printf("%3d: %d\n",i,trak->keyframes[i]);
break;
}
case MOV_FOURCC('m','d','i','a'): {
@@ -751,8 +750,20 @@ if(trak->samplesize){
unsigned int ipts=pts;
// printf("MOV track seek - sample: %d \n",ipts);
if(!(flags&1)) ipts+=trak->samples[trak->pos].pts;
trak->pos=0;
while(trak->pos<trak->samples_size && trak->samples[trak->pos].pts<ipts) ++trak->pos;
for(trak->pos=0;trak->pos<trak->samples_size;++trak->pos){
if(trak->samples[trak->pos].pts>=ipts) break; // found it!
}
if(trak->keyframes_size){
// find nearest keyframe
int i;
for(i=0;i<trak->keyframes_size;i++){
if(trak->keyframes[i]>=trak->pos) break;
}
if(i>0 &&
(trak->keyframes[i]-trak->pos) > (trak->pos-trak->keyframes[i-1])) --i;
trak->pos=trak->keyframes[i];
// printf("nearest keyframe: %d \n",trak->pos);
}
pts=(float)trak->samples[trak->pos].pts/(float)trak->timescale;
}