| /********** |
| 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 |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // Collects a stream of incoming MPEG Transport Stream packets into |
| // a chunk sufficiently large to send in a single outgoing (RTP or UDP) packet. |
| // Implementation |
| |
| #include "MPEG2TransportStreamAccumulator.hh" |
| |
| MPEG2TransportStreamAccumulator* |
| MPEG2TransportStreamAccumulator::createNew(UsageEnvironment& env, |
| FramedSource* inputSource, unsigned maxPacketSize) { |
| return new MPEG2TransportStreamAccumulator(env, inputSource, maxPacketSize); |
| } |
| |
| #ifndef TRANSPORT_PACKET_SIZE |
| #define TRANSPORT_PACKET_SIZE 188 |
| #endif |
| |
| MPEG2TransportStreamAccumulator |
| ::MPEG2TransportStreamAccumulator(UsageEnvironment& env, |
| FramedSource* inputSource, unsigned maxPacketSize) |
| : FramedFilter(env, inputSource), |
| fDesiredPacketSize(maxPacketSize < TRANSPORT_PACKET_SIZE ? TRANSPORT_PACKET_SIZE : (maxPacketSize/TRANSPORT_PACKET_SIZE)), |
| fNumBytesGathered(0) { |
| } |
| |
| MPEG2TransportStreamAccumulator::~MPEG2TransportStreamAccumulator() { |
| } |
| |
| void MPEG2TransportStreamAccumulator::doGetNextFrame() { |
| if (fNumBytesGathered >= fDesiredPacketSize) { |
| // Complete the delivery to the client: |
| fFrameSize = fNumBytesGathered; |
| fNumBytesGathered = 0; |
| afterGetting(this); |
| } else { |
| // Ask for more data (delivered directly to the client's buffer); |
| fInputSource->getNextFrame(fTo, fMaxSize, afterGettingFrame, this, |
| FramedSource::handleClosure, this); |
| } |
| } |
| |
| void MPEG2TransportStreamAccumulator |
| ::afterGettingFrame(void* clientData, unsigned frameSize, |
| unsigned numTruncatedBytes, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds) { |
| MPEG2TransportStreamAccumulator* accumulator |
| = (MPEG2TransportStreamAccumulator*)clientData; |
| accumulator->afterGettingFrame1(frameSize, numTruncatedBytes, |
| presentationTime, durationInMicroseconds); |
| } |
| |
| void MPEG2TransportStreamAccumulator |
| ::afterGettingFrame1(unsigned frameSize, |
| unsigned numTruncatedBytes, |
| struct timeval presentationTime, |
| unsigned durationInMicroseconds) { |
| if (fNumBytesGathered == 0) { // this is the first frame of the new chunk |
| fPresentationTime = presentationTime; |
| fDurationInMicroseconds = 0; |
| } |
| fNumBytesGathered += frameSize; |
| fTo += frameSize; |
| fMaxSize -= frameSize; |
| fDurationInMicroseconds += durationInMicroseconds; |
| |
| // Try again to complete delivery: |
| doGetNextFrame(); |
| } |