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);
}
}
int main(int argc, char const** argv) {
// Begin by setting up our usage environment:
TaskScheduler* scheduler = BasicTaskScheduler::createNew();
env = BasicUsageEnvironment::createNew(*scheduler);
// Parse the command line:
programName = argv[0];
if (argc != 5) usage();
char const* inputFileName = argv[1];
// Check whether the input file name ends with ".ts":
int len = strlen(inputFileName);
if (len < 4 || strcmp(&inputFileName[len-3], ".ts") != 0) {
*env << "ERROR: input file name \"" << inputFileName
<< "\" does not end with \".ts\"\n";
usage();
}
// Parse the <start-time> and <scale> parameters:
float startTime;
if (sscanf(argv[2], "%f", &startTime) != 1 || startTime < 0.0f) usage();
int scale;
if (sscanf(argv[3], "%d", &scale) != 1 || scale == 0) usage();
// Open the input file (as a 'byte stream file source'):
FramedSource* input
= ByteStreamFileSource::createNew(*env, inputFileName, TRANSPORT_PACKET_SIZE);
if (input == NULL) {
*env << "Failed to open input file \"" << inputFileName << "\" (does it exist?)\n";
exit(1);
}
// Check whether the corresponding index file exists.
// The index file name is the same as the input file name, except with suffix ".tsx":
char* indexFileName = new char[len+2]; // allow for trailing x\0
sprintf(indexFileName, "%sx", inputFileName);
MPEG2TransportStreamIndexFile* indexFile
= MPEG2TransportStreamIndexFile::createNew(*env, indexFileName);
if (indexFile == NULL) {
*env << "Failed to open index file \"" << indexFileName << "\" (does it exist?)\n";
exit(1);
}
// Create a filter that generates trick mode data from the input and index files:
MPEG2TransportStreamTrickModeFilter* trickModeFilter
= MPEG2TransportStreamTrickModeFilter::createNew(*env, input, indexFile, scale);
if (startTime > 0.0f) {
// Seek the input Transport Stream and Index files to the specified start time:
unsigned long tsRecordNumber, indexRecordNumber;
indexFile->lookupTSPacketNumFromNPT(startTime, tsRecordNumber, indexRecordNumber);
if (!trickModeFilter->seekTo(tsRecordNumber, indexRecordNumber)) { // TARFU!
*env << "Failed to seek trick mode filter to ts #" << (unsigned)tsRecordNumber
<< ", ix #" << (unsigned)indexRecordNumber
<< "(for time " << startTime << ")\n";
exit(1);
}
}
// Generate a new Transport Stream from the Trick Mode filter:
MPEG2TransportStreamFromESSource* newTransportStream
= MPEG2TransportStreamFromESSource::createNew(*env);
newTransportStream->addNewVideoSource(trickModeFilter, indexFile->mpegVersion());
// Open the output file (for writing), as a 'file sink':
char const* outputFileName = argv[4];
MediaSink* output = FileSink::createNew(*env, outputFileName);
if (output == NULL) {
*env << "Failed to open output file \"" << outputFileName << "\"\n";
exit(1);
}
// Start playing, to generate the output file:
*env << "Writing output file \"" << outputFileName
<< "\" (start time " << startTime
<< ", scale " << scale
<< ")...";
output->startPlaying(*newTransportStream, afterPlaying, NULL);
env->taskScheduler().doEventLoop(); // does not return
return 0; // only to prevent compiler warning
}