void ClientTrickPlayState::updateStateOnPlayChange(Boolean reverseToPreviousVSH)
{
updateTSRecordNum();
if (fTrickPlaySource == NULL)
{
// We were in regular (1x) play. Use the index file to look up the
// index record number and npt from the current transport number:
fIndexFile->lookupPCRFromTSPacketNum(fTSRecordNum, reverseToPreviousVSH, fNPT, fIxRecordNum);
}
else
{
// We were in trick mode, and so already have the index record number.
// Get the transport record number and npt from this:
fIxRecordNum = fTrickModeFilter->nextIndexRecordNum();
if ((long)fIxRecordNum < 0) fIxRecordNum = 0; // we were at the start of the file
unsigned long transportRecordNum;
float pcr;
u_int8_t offset, size, recordType; // all dummy
if (fIndexFile->readIndexRecordValues(fIxRecordNum, transportRecordNum,
offset, size, pcr, recordType))
{
fTSRecordNum = transportRecordNum;
fNPT = pcr;
}
}
}
unsigned long ClientTrickPlayState::updateStateFromNPT(double npt, double streamDuration) {
fNPT = (float)npt;
// Map "fNPT" to the corresponding Transport Stream and Index record numbers:
unsigned long tsRecordNum, ixRecordNum;
fIndexFile->lookupTSPacketNumFromNPT(fNPT, tsRecordNum, ixRecordNum);
updateTSRecordNum();
if (tsRecordNum != fTSRecordNum) {
fTSRecordNum = tsRecordNum;
fIxRecordNum = ixRecordNum;
// Seek the source to the new record number:
reseekOriginalTransportStreamSource();
// Note: We assume that we're asked to seek only in normal
// (i.e., non trick play) mode, so we don't seek within the trick
// play source (if any).
fFramer->clearPIDStatusTable();
}
unsigned long numTSRecordsToStream = 0;
float pcrLimit = 0.0;
if (streamDuration > 0.0) {
// fNPT might have changed when we looked it up in the index file. Adjust "streamDuration" accordingly:
streamDuration += npt - (double)fNPT;
if (streamDuration > 0.0) {
// Specify that we want to stream no more data than this.
if (fNextScale == 1.0f) {
// We'll be streaming from the original file.
// Use the index file to figure out how many Transport Packets we get to stream:
unsigned long toTSRecordNum, toIxRecordNum;
float toNPT = (float)(fNPT + streamDuration);
fIndexFile->lookupTSPacketNumFromNPT(toNPT, toTSRecordNum, toIxRecordNum);
if (toTSRecordNum > tsRecordNum) { // sanity check
numTSRecordsToStream = toTSRecordNum - tsRecordNum;
}
} else {
// We'll be streaming from the trick play stream.
// It'd be difficult to figure out how many Transport Packets we need to stream, so instead set a PCR
// limit in the trick play stream. (We rely upon the fact that PCRs in the trick play stream start at 0.0)
int direction = fNextScale < 0.0 ? -1 : 1;
pcrLimit = (float)(streamDuration/(fNextScale*direction));
}
}
}
fFramer->setNumTSPacketsToStream(numTSRecordsToStream);
fFramer->setPCRLimit(pcrLimit);
return numTSRecordsToStream;
}
void ClientTrickPlayState::updateStateFromNPT(double npt) {
fNPT = (float)npt;
// Map "fNPT" to the corresponding Transport Stream and Index record numbers:
unsigned long tsRecordNum, ixRecordNum;
fIndexFile->lookupTSPacketNumFromNPT(fNPT, tsRecordNum, ixRecordNum);
updateTSRecordNum();
if (tsRecordNum != fTSRecordNum) {
fTSRecordNum = tsRecordNum;
fIxRecordNum = ixRecordNum;
// Seek the source to the new record number:
reseekOriginalTransportStreamSource();
// Note: We assume that we're asked to seek only in normal
// (i.e., non trick play) mode, so we don't seek within the trick
// play source (if any).
fFramer->clearPIDStatusTable();
}
}
unsigned long ClientTrickPlayState::updateStateFromNPT(double npt, double streamDuration) {
fNPT = (float)npt;
// Map "fNPT" to the corresponding Transport Stream and Index record numbers:
unsigned long tsRecordNum, ixRecordNum;
fIndexFile->lookupTSPacketNumFromNPT(fNPT, tsRecordNum, ixRecordNum);
updateTSRecordNum();
if (tsRecordNum != fTSRecordNum) {
fTSRecordNum = tsRecordNum;
fIxRecordNum = ixRecordNum;
// Seek the source to the new record number:
reseekOriginalTransportStreamSource();
// Note: We assume that we're asked to seek only in normal
// (i.e., non trick play) mode, so we don't seek within the trick
// play source (if any).
fFramer->clearPIDStatusTable();
}
// NPT might have changed when we looked it up in the index file. Adjust "streamDuration" accordingly:
streamDuration += npt - (double)fNPT;
unsigned long numTSRecordsToStream = 0;
if (streamDuration > 0.0) {
// Use the index file to figure out how many Transport Packets we get to stream:
unsigned long toTSRecordNum, toIxRecordNum;
float toNPT = (float)(fNPT + streamDuration);
fIndexFile->lookupTSPacketNumFromNPT(toNPT, toTSRecordNum, toIxRecordNum);
if (toTSRecordNum > tsRecordNum) { // sanity check
numTSRecordsToStream = toTSRecordNum - tsRecordNum;
}
}
fFramer->setNumTSPacketsToStream(numTSRecordsToStream);
return numTSRecordsToStream;
}
