public void StartWithAsync(TaskCompletionSource <object> completionSource, AVReaderWriter handler)
{
if (_completionSource != null)
{
throw new InvalidProgramException();
}
_completionSource = completionSource;
_assetWriterInput.RequestMediaData(_serializationQueue, () => {
if (_finished)
{
return;
}
bool completedOrFailed = false;
// Read samples in a loop as long as the asset writer input is ready
while (_assetWriterInput.ReadyForMoreMediaData && !completedOrFailed)
{
bool success;
using (CMSampleBuffer sampleBuffer = _assetReaderOutput.CopyNextSampleBuffer()) {
if (sampleBuffer == null)
{
completedOrFailed = true;
continue;
}
if (_adaptor != null)
{
CMTime presentationTime = sampleBuffer.PresentationTimeStamp;
using (CVPixelBuffer writerBuffer = _adaptor.PixelBufferPool.CreatePixelBuffer()) {
handler.DidReadAndWriteSampleBuffer(this, sampleBuffer, writerBuffer);
success = _adaptor.AppendPixelBufferWithPresentationTime(writerBuffer, presentationTime);
}
}
else
{
handler.DidReadSampleBuffer(this, sampleBuffer);
success = _assetWriterInput.AppendSampleBuffer(sampleBuffer);
}
}
completedOrFailed = !success;
}
if (completedOrFailed)
{
CompleteTaskIfNecessary();
}
});
}
void WriteSampleBuffer(CMSampleBuffer sampleBuffer, NSString mediaType)
{
if (assetWriter.Status == AVAssetWriterStatus.Unknown)
{
if (assetWriter.StartWriting())
{
assetWriter.StartSessionAtSourceTime(sampleBuffer.OutputPresentationTimeStamp);
}
else
{
ShowError(assetWriter.Error);
}
}
if (assetWriter.Status == AVAssetWriterStatus.Writing)
{
if (mediaType == AVMediaType.Video)
{
if (assetWriterVideoIn.ReadyForMoreMediaData)
{
if (!assetWriterVideoIn.AppendSampleBuffer(sampleBuffer))
{
ShowError(assetWriter.Error);
}
}
}
else if (mediaType == AVMediaType.Audio)
{
if (assetWriterAudioIn.ReadyForMoreMediaData)
{
if (!assetWriterAudioIn.AppendSampleBuffer(sampleBuffer))
{
ShowError(assetWriter.Error);
}
}
}
}
}