Today I analyse the .tsx file’s generation logical. Here is my founding:
1. In MPEG2TransportStreamIndexFile.hh
#define INDEX_RECORD_SIZE 11
2. In MPEG2TransportStreamIndexFile.cpp
238 Boolean MPEG2TransportStreamIndexFile::seekToIndexRecord(unsigned long
indexRecordNumber) {
239 if (!openFid()) return False;
240
241 if (indexRecordNumber == fCurrentIndexRecordNum) return True; // we're
already there
242
243 if (SeekFile64(fFid, (int64_t)(indexRecordNumber*INDEX_RECORD_SIZE),
SEEK_SET) != 0) return False;
244 fCurrentIndexRecordNum = indexRecordNumber;
245 return True;
246 }
Which we can got conclusion, the .tsx’s item is 11 bytes long.
3. Still In MPEG2TransportStreamIndexFile.cpp
float MPEG2TransportStreamIndexFile::pcrFromBuf() {
unsigned pcr_int = (fBuf[5]<<16) | (fBuf[4]<<8) | fBuf[3];
u_int8_t pcr_frac = fBuf[6];
return pcr_int + pcr_frac/256.0f;
}
//Conclusion A : item[3-6] is a time-anchor.
unsigned long MPEG2TransportStreamIndexFile::tsPacketNumFromBuf() {
return (fBuf[10]<<24) | (fBuf[9]<<16) | (fBuf[8]<<8) | fBuf[7];
}
//Conclusion B: item[7-10] is .tsx file’s item index.
Boolean
MPEG2TransportStreamIndexFile::seekToIndexRecord(unsigned long
indexRecordNumber) {
if (!openFid()) return False;
if (indexRecordNumber == fCurrentIndexRecordNum) return True; // we're
already there
if (SeekFile64(fFid, (int64_t)(indexRecordNumber*INDEX_RECORD_SIZE),
SEEK_SET) != 0) return False;
fCurrentIndexRecordNum = indexRecordNumber;
return True;
}
//Conclusion C: item[0~7] is record the frame position in .ts file.
It seems like Conclussion A, B, C can not be all right. Especially
Conclusion B and C could not be both right.
And, I have make a experiment, the trick play can not work property (through
vlc media player).
Wait for your opionion, thanks a lot.
Fengxh, China
_______________________________________________
live-devel mailing list
live-devel@lists.live555.com
http://lists.live555.com/mailman/listinfo/live-devel
