static int Seek(flv* p, tick_t Time, filepos_t FilePos,bool_t PrevKey)
{
int i=0;
tick_t preIndexNum = -1;
if(Time>=0)
{
for( i = 0; i < p->IndexNum; i++)
{
tick_t RefTime = Scale(((flvindex*)IndexBuffer(p,i))->times, TICKSPERSEC, 1);
if(Time<=RefTime)
break;
preIndexNum = i;
}
}
if(PrevKey&&preIndexNum!=-1)
i = preIndexNum;
if(p->IndexNum == 0)
{
if(Time>=0 && p->Format.Duration > 0)
return SeekNoIndex(p,Time,FilePos,PrevKey);
return ERR_NOT_SUPPORTED;
}
else if(i >= 0 && i < p->IndexNum)
{
FilePos = ((flvindex*)IndexBuffer(p,i))->pos-4;
}
else
{
FilePos = p->StartOffset;
}
return Format_Seek(&p->Format,FilePos,SEEK_SET);
}
static int Seek(asap* p, tick_t Time, int FilePos, bool_t PrevKey)
{
if (Time>0 || FilePos>0)
return ERR_NOT_SUPPORTED;
if (Format_Seek(&p->Format,0,SEEK_SET) != ERR_NONE)
return ERR_NOT_SUPPORTED;
Load(p);
return ERR_NONE;
}
int RawAudioSeek(rawaudio* p, tick_t Time, filepos_t FilePos,bool_t PrevKey)
{
format_stream* Stream = p->Format.Streams[0];
if (FilePos < 0)
{
if (Time > 0)
{
if (Stream->Format.ByteRate)
FilePos = p->Head + Scale(Time,Stream->Format.ByteRate,TICKSPERSEC);
else
return ERR_NOT_SUPPORTED;
}
else
FilePos = 0;
}
p->SeekTime = Time>0?Time:TIME_UNKNOWN;
p->SeekPos = FilePos;
return Format_Seek(&p->Format,FilePos,SEEK_SET);
}
static int SeekNoIndex(flv* p, tick_t Time, filepos_t FilePos,bool_t PrevKey)
{
filepos_t LastFilePos;
bool_t fAudio = p->bHasA;
bool_t fVideo = p->bHasV;
Tag t;
AudioTag at;
VideoTag vt;
format_reader* Reader = p->Format.Reader;
if(Time < 0 || p->Format.Duration <= 0)
return ERR_NOT_SUPPORTED;
LastFilePos = p->StartOffset + 1.0 * Time/p->Format.Duration*(p->Format.FileSize - p->StartOffset);
if(!Sync(p,Reader,LastFilePos))
{
Format_Seek(&p->Format,p->StartOffset,SEEK_SET);
return ERR_NONE;
}
while(ReadTag(p,Reader,&t))
{
tick_t TagTime = Scale(t.TimeStamp,TICKSPERSEC,1000);
if(TagTime >= Time)
{
LastFilePos = Reader->FilePos - 15;
Reader->Seek(Reader,Reader->FilePos - 15,SEEK_SET);
break;
}
LastFilePos = Reader->FilePos + t.DataSize;
Reader->Seek(Reader,Reader->FilePos + t.DataSize,SEEK_SET);
}
while(Reader->FilePos >= p->StartOffset && (fAudio || fVideo) && ReadTag(p,Reader,&t))
{
filepos_t prev = Reader->FilePos - 15 - t.PreviousTagSize - 4;
tick_t TimeStamp = Scale(t.TimeStamp,TICKSPERSEC,1000);
if(TimeStamp <= Time)
{
if(t.TagType == 8 && ReadATag(p,Reader,&at))
{
fAudio = 0;
}
else if(t.TagType == 9 && ReadVTag(p,Reader,&vt) && vt.FrameType == 1)
{
fVideo = 0;
}
}
LastFilePos = prev;
Reader->Seek(Reader,prev,SEEK_SET);
}
if(fAudio || fVideo)
{
LastFilePos = p->StartOffset;
Format_Seek(&p->Format,p->StartOffset,SEEK_SET);
return ERR_NONE;
}
return Format_Seek(&p->Format,LastFilePos,SEEK_SET);
}
