public virtual void DidOutputSampleBuffer(AVCaptureOutput captureOutput, CMSampleBuffer sampleBuffer, AVCaptureConnection connection)
{
// HACK: Change CMSampleBuffer.GetFormatDescription() to CMSampleBuffer.GetVideoFormatDescription()
// HACK Change CMFormatDescription to CMVideoFormatDescription
// CMFormatDescription formatDescription = sampleBuffer.GetFormatDescription ();
CMVideoFormatDescription formatDescription = sampleBuffer.GetVideoFormatDescription();
if (connection == videoConnection)
{
// Get framerate
CMTime timestamp = sampleBuffer.PresentationTimeStamp;
CalculateFramerateAtTimestamp(timestamp);
// Get frame dimensions (for onscreen display)
if (VideoDimensions.IsEmpty)
{
// HACK: Change GetVideoPresentationDimensions() to GetPresentationDimensions()
// VideoDimensions = formatDescription.GetVideoPresentationDimensions (true, false);
VideoDimensions = formatDescription.GetPresentationDimensions(true, false);
}
// Get the buffer type
if (VideoType == 0)
{
VideoType = formatDescription.MediaSubType;
}
// Synchronously process the pixel buffer to de-green it.
using (var pixelBuffer = sampleBuffer.GetImageBuffer())
ProcessPixelBuffer(pixelBuffer);
previewBufferQueue.Enqueue(sampleBuffer);
//var writeBuffer = sampleBuffer.Duplicate ();
InvokeOnMainThread(() => {
INativeObject j = previewBufferQueue.Dequeue();
var sbuf = j as CMSampleBuffer;
if (sbuf == null)
{
#if DEBUG
// Record the current sampleBuffer.ClassHandle
// Then run another iteration and on the next one, print the ClassHandle
Console.WriteLine("The type is {0}", j.ToString());
#endif
return;
}
using (CVImageBuffer pixBuf = sbuf.GetImageBuffer()) {
if (PixelBufferReadyForDisplay != null)
{
PixelBufferReadyForDisplay(pixBuf);
}
}
});
}
// keep a reference to 'sampleBuffer', movieWritingQueue will remove it
CompleteBufferUse(sampleBuffer);
movieWritingQueue.DispatchAsync(() => {
if (assetWriter != null)
{
bool wasReadyToRecord = (readyToRecordAudio && readyToRecordVideo);
if (connection == videoConnection)
{
// Initialize the video input if this is not done yet
if (!readyToRecordVideo)
{
readyToRecordVideo = SetupAssetWriterVideoInput(formatDescription);
}
// Write the video data to file
if (readyToRecordVideo && readyToRecordAudio)
{
WriteSampleBuffer(sampleBuffer, AVMediaType.Video);
}
}
else if (connection == audioConnection)
{
if (!readyToRecordAudio)
{
readyToRecordAudio = SetupAssetWriterAudioInput(formatDescription);
}
if (readyToRecordAudio && readyToRecordVideo)
{
WriteSampleBuffer(sampleBuffer, AVMediaType.Audio);
}
}
bool isReadyToRecord = (readyToRecordAudio && readyToRecordVideo);
if (!wasReadyToRecord && isReadyToRecord)
{
recordingWillBeStarted = false;
IsRecording = true;
if (RecordingDidStart != null)
{
RecordingDidStart();
}
}
}
CompleteBufferUse(sampleBuffer);
});
}
