| /********** |
| 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 3 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., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // Copyright (c) 1996-2020, 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> |
| |
| 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, 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 |
| } |
| |
| void afterPlaying(void* /*clientData*/) { |
| *env << "...done\n"; |
| exit(0); |
| } |