void ClientTrickPlayState::updateStateOnScaleChange() { fScale = fNextScale; // Change our source objects to reflect the change in scale: // First, close the existing trick play source (if any): if (fTrickPlaySource != NULL) { fTrickModeFilter->forgetInputSource(); // so that the underlying Transport Stream source doesn't get deleted by: Medium::close(fTrickPlaySource); fTrickPlaySource = NULL; fTrickModeFilter = NULL; } if (fNextScale != 1.0f) { // Create a new trick play filter from the original Transport Stream source: UsageEnvironment &env = fIndexFile->envir(); // alias fTrickModeFilter = MPEG2TransportStreamTrickModeFilter ::createNew(env, fOriginalTransportStreamSource, fIndexFile, int(fNextScale)); fTrickModeFilter->seekTo(fTSRecordNum, fIxRecordNum); // And generate a Transport Stream from this: fTrickPlaySource = MPEG2TransportStreamFromESSource::createNew(env); fTrickPlaySource->addNewVideoSource(fTrickModeFilter, fIndexFile->mpegVersion()); fFramer->changeInputSource(fTrickPlaySource); } else { // Switch back to the original Transport Stream source: reseekOriginalTransportStreamSource(); fFramer->changeInputSource(fOriginalTransportStreamSource); } }
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; }