bool ofxVideoRecorder::addFrame(const ofPixels &pixels)
{
if (!bIsRecording || bIsPaused) return false;
if(bIsInitialized && bRecordVideo)
{
int framesToAdd = 1; //default add one frame per request
if((bRecordAudio || bSysClockSync) && !bFinishing){
double syncDelta;
double videoRecordedTime = videoFramesRecorded / frameRate;
if (bRecordAudio) {
//if also recording audio, check the overall recorded time for audio and video to make sure audio is not going out of sync
//this also handles incoming dynamic framerate while maintaining desired outgoing framerate
double audioRecordedTime = (audioSamplesRecorded/audioChannels) / (double)sampleRate;
syncDelta = audioRecordedTime - videoRecordedTime;
}
else {
//if just recording video, synchronize the video against the system clock
//this also handles incoming dynamic framerate while maintaining desired outgoing framerate
syncDelta = systemClock() - videoRecordedTime;
}
if(syncDelta > 1.0/frameRate) {
//no enought video frames, we need to send extra video frames.
int numFramesCopied = 0;
while(syncDelta > 1.0/frameRate) {
framesToAdd++;
syncDelta -= 1.0/frameRate;
}
ofLogVerbose() << "ofxVideoRecorder: recDelta = " << syncDelta << ". Not enough video frames for desired frame rate, copied this frame " << framesToAdd << " times.\n";
}
else if(syncDelta < -1.0/frameRate){
//more than one video frame is waiting, skip this frame
framesToAdd = 0;
ofLogVerbose() << "ofxVideoRecorder: recDelta = " << syncDelta << ". Too many video frames, skipping.\n";
}
}
for(int i=0;i<framesToAdd;i++){
//add desired number of frames
frames.Produce(new ofPixels(pixels));
videoFramesRecorded++;
}
videoThread.signal();
return true;
}
return false;
}
unsigned long TimingData::getClock()
{
#if TIMING_UNIX
struct timeval tv;
gettimeofday(&tv, 0);
return tv.tv_sec * 1000 + tv.tv_usec/1000;
#else
return systemClock();
#endif
}