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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**********/
// Copyright (c) 1996-2007, Live Networks, Inc. All rights reserved
// A program that tests 'trick mode' operations on a MPEG-2 Transport Stream file,
// by generating a new Transport Stream file that represents the result of the
// 'trick mode' operation (seeking and/or fast forward/reverse play).
// For this to work, there must also be an index file present, in the same directory
// as the Transport Stream file, and with the same name prefix. (The Transport
// Stream file has name suffix ".ts"; the index file has name suffix ".tsx".)
// main program
#include <liveMedia.hh>
#include <BasicUsageEnvironment.hh>
// We assume that the video - in the original Transport Stream file - is MPEG-2. If, instead, it is MPEG-1,
// then change the following definition to 1:
#define VIDEO_MPEG_VERSION 2
void afterPlaying(void* clientData); // forward
UsageEnvironment* env;
char const* programName;
void usage() {
*env << "usage: " << programName << " <input-transport-stream-file-name> <start-time> <scale> <output-transport-stream-file-name>\n";
*env << "\twhere\t<transport-stream-file-name> ends with \".ts\"\n";
*env << "\t\t<start-time> is the starting play time in seconds (0 for the start)\n";
*env << "\t\t<scale> is a non-zero integer, representing the playing speed (use 1 for normal play; use a negative number for reverse play)\n";
exit(1);
}
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, VIDEO_MPEG_VERSION);
// 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
}
void afterPlaying(void* /*clientData*/) {
*env << "...done\n";
exit(0);
}
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