H264or5VideoFileSink.cpp

/**********
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
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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
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**********/
// "liveMedia"
// Copyright (c) 1996-2023 Live Networks, Inc.  All rights reserved.
// H.264 or H.265 Video File sinks
// Implementation

#include "H264or5VideoFileSink.hh"
#include "H264VideoRTPSource.hh" // for "parseSPropParameterSets()"

////////// H264or5VideoFileSink //////////

H264or5VideoFileSink
::H264or5VideoFileSink(UsageEnvironment& env, FILE* fid,
		       unsigned bufferSize, char const* perFrameFileNamePrefix,
		       char const* sPropParameterSetsStr1,
                       char const* sPropParameterSetsStr2,
                       char const* sPropParameterSetsStr3)
  : FileSink(env, fid, bufferSize, perFrameFileNamePrefix),
    fHaveWrittenFirstFrame(False) {
  fSPropParameterSetsStr[0] = strDup(sPropParameterSetsStr1);
  fSPropParameterSetsStr[1] = strDup(sPropParameterSetsStr2);
  fSPropParameterSetsStr[2] = strDup(sPropParameterSetsStr3);
}

H264or5VideoFileSink::~H264or5VideoFileSink() {
  for (unsigned j = 0; j < 3; ++j) delete[] (char*)fSPropParameterSetsStr[j];
}

void H264or5VideoFileSink::afterGettingFrame(unsigned frameSize, unsigned numTruncatedBytes, struct timeval presentationTime) {
  unsigned char const start_code[4] = {0x00, 0x00, 0x00, 0x01};

  if (!fHaveWrittenFirstFrame) {
    // If we have NAL units encoded in "sprop parameter strings", prepend these to the file:
    for (unsigned j = 0; j < 3; ++j) {
      unsigned numSPropRecords;
      SPropRecord* sPropRecords
	= parseSPropParameterSets(fSPropParameterSetsStr[j], numSPropRecords);
      for (unsigned i = 0; i < numSPropRecords; ++i) {
	if (sPropRecords[i].sPropLength > 0) addData(start_code, 4, presentationTime);
	addData(sPropRecords[i].sPropBytes, sPropRecords[i].sPropLength, presentationTime);
      }
      delete[] sPropRecords;
    }
    fHaveWrittenFirstFrame = True; // for next time
  }

  // Write the input data to the file, with the start code in front:
  addData(start_code, 4, presentationTime);

  // Call the parent class to complete the normal file write with the input data:
  FileSink::afterGettingFrame(frameSize, numTruncatedBytes, presentationTime);
}