void SetupAssetReaderWriterForAudio(AVAssetTrack audioTrack)
{
if (audioTrack == null)
{
return;
}
// Decompress to Linear PCM with the asset reader
// To read the media data from a specific asset track in the format in which it was stored, pass null to the settings parameter.
AVAssetReaderOutput output = AVAssetReaderTrackOutput.Create(audioTrack, (AudioSettings)null);
if (assetReader.CanAddOutput(output))
{
assetReader.AddOutput(output);
}
AVAssetWriterInput input = AVAssetWriterInput.Create(audioTrack.MediaType, (AudioSettings)null);
if (assetWriter.CanAddInput(input))
{
assetWriter.AddInput(input);
}
// Create and save an instance of ReadWriteSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
audioSampleBufferChannel = new AudioChannel(output, input);
}
Task Start(ReadWriteSampleBufferChannel channel)
{
if (channel == null)
{
return(Task.FromResult <object> (null));
}
else
{
return(channel.StartAsync());
}
}
void SetupAssetReaserWriterForVideo(AVAssetTrack videoTrack)
{
if (videoTrack == null)
{
return;
}
// Decompress to ARGB with the asset reader
var decompSettings = new AVVideoSettingsUncompressed {
PixelFormatType = CVPixelFormatType.CV32BGRA,
AllocateWithIOSurface = null
};
AVAssetReaderOutput output = new AVAssetReaderTrackOutput(videoTrack, decompSettings);
assetReader.AddOutput(output);
// Get the format description of the track, to fill in attributes of the video stream that we don't want to change
var formatDescription = (CMVideoFormatDescription)videoTrack.FormatDescriptions.FirstOrDefault();
// Grab track dimensions from format description
CGSize trackDimensions = formatDescription != null
? formatDescription.GetPresentationDimensions(false, false)
: videoTrack.NaturalSize;
// Grab clean aperture, pixel aspect ratio from format description
AVVideoCodecSettings compressionSettings = null;
if (formatDescription != null)
{
var cleanApertureDescr = (NSDictionary)formatDescription.GetExtension(CVImageBuffer.CleanApertureKey);
var pixelAspectRatioDescr = (NSDictionary)formatDescription.GetExtension(CVImageBuffer.PixelAspectRatioKey);
compressionSettings = CreateCodecSettingsFor(cleanApertureDescr, pixelAspectRatioDescr);
}
// Compress to H.264 with the asset writer
var videoSettings = new AVVideoSettingsCompressed {
Codec = AVVideoCodec.H264,
Width = (int)trackDimensions.Width,
Height = (int)trackDimensions.Height,
CodecSettings = compressionSettings
};
AVAssetWriterInput input = new AVAssetWriterInput(videoTrack.MediaType, videoSettings);
input.Transform = videoTrack.PreferredTransform;
assetWriter.AddInput(input);
// Create and save an instance of ReadWriteSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
videoSampleBufferChannel = new VideoChannel(output, input, transformer);
}
// TODO: where called in original sample
// - (void)cancel:(id)sender
private Task StartReadingAsync(ReadWriteSampleBufferChannel channel, AVReaderWriter handler)
{
var completionSrc = new TaskCompletionSource <object> ();
if (channel == null)
{
completionSrc.SetResult(null);
}
else
{
channel.StartWithAsync(completionSrc, handler);
}
return(completionSrc.Task);
}
public void DidReadSampleBuffer(ReadWriteSampleBufferChannel sampleBufferChannel, CMSampleBuffer sampleBuffer)
{
// Calculate progress (scale of 0.0 to 1.0)
double progress = AVReaderWriter.ProgressOfSampleBufferInTimeRange(sampleBuffer, _timeRange);
_progressProc((float)progress * 100);
// Grab the pixel buffer from the sample buffer, if possible
CVImageBuffer imageBuffer = sampleBuffer.GetImageBuffer();
var pixelBuffer = imageBuffer as CVPixelBuffer;
if (pixelBuffer != null)
{
Delegate.AdjustPixelBuffer(pixelBuffer, null); // TODO: problem in original sample. No method
}
}
private void SetupAssetReaderWriterForAudio(AVAssetTrack audioTrack)
{
if (audioTrack == null)
{
return;
}
// Decompress to Linear PCM with the asset reader
AVAssetReaderOutput output = AVAssetReaderTrackOutput.Create(audioTrack, (AudioSettings)null);
_assetReader.AddOutput(output);
AVAssetWriterInput input = AVAssetWriterInput.Create(audioTrack.MediaType, (AudioSettings)null);
_assetWriter.AddInput(input);
// Create and save an instance of AAPLRWSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
_audioSampleBufferChannel = new ReadWriteSampleBufferChannel(output, input, false);
}
void ReadingAndWritingDidFinish(bool success, NSError error)
{
if (!success)
{
assetReader.CancelReading();
assetWriter.CancelWriting();
}
// Tear down
assetReader.Dispose();
assetReader = null;
assetWriter.Dispose();
assetWriter = null;
audioSampleBufferChannel = null;
videoSampleBufferChannel = null;
cancellationTokenSrc = null;
completionProc(error);
}
void ReadingAndWritingDidFinish (bool success, NSError error)
{
if (!success) {
assetReader.CancelReading ();
assetWriter.CancelWriting ();
}
// Tear down
assetReader.Dispose ();
assetReader = null;
assetWriter.Dispose ();
assetWriter = null;
audioSampleBufferChannel = null;
videoSampleBufferChannel = null;
cancellationTokenSrc = null;
completionProc (error);
}
Task Start (ReadWriteSampleBufferChannel channel)
{
if (channel == null)
return Task.FromResult<object> (null);
else
return channel.StartAsync ();
}
void SetupAssetReaserWriterForVideo (AVAssetTrack videoTrack)
{
if (videoTrack == null)
return;
// Decompress to ARGB with the asset reader
var decompSettings = new AVVideoSettingsUncompressed {
PixelFormatType = CVPixelFormatType.CV32BGRA,
AllocateWithIOSurface = null
};
AVAssetReaderOutput output = new AVAssetReaderTrackOutput (videoTrack, decompSettings);
assetReader.AddOutput (output);
// Get the format description of the track, to fill in attributes of the video stream that we don't want to change
var formatDescription = (CMVideoFormatDescription)videoTrack.FormatDescriptions.FirstOrDefault ();
// Grab track dimensions from format description
CGSize trackDimensions = formatDescription != null
? formatDescription.GetPresentationDimensions (false, false)
: videoTrack.NaturalSize;
// Grab clean aperture, pixel aspect ratio from format description
AVVideoCodecSettings compressionSettings = null;
if (formatDescription != null) {
var cleanApertureDescr = (NSDictionary)formatDescription.GetExtension (CVImageBuffer.CleanApertureKey);
var pixelAspectRatioDescr = (NSDictionary)formatDescription.GetExtension (CVImageBuffer.PixelAspectRatioKey);
compressionSettings = CreateCodecSettingsFor (cleanApertureDescr, pixelAspectRatioDescr);
}
// Compress to H.264 with the asset writer
var videoSettings = new AVVideoSettingsCompressed {
Codec = AVVideoCodec.H264,
Width = (int)trackDimensions.Width,
Height = (int)trackDimensions.Height,
CodecSettings = compressionSettings
};
AVAssetWriterInput input = new AVAssetWriterInput (videoTrack.MediaType, videoSettings);
input.Transform = videoTrack.PreferredTransform;
assetWriter.AddInput (input);
// Create and save an instance of ReadWriteSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
videoSampleBufferChannel = new VideoChannel (output, input, transformer);
}
void SetupAssetReaderWriterForAudio (AVAssetTrack audioTrack)
{
if (audioTrack == null)
return;
// Decompress to Linear PCM with the asset reader
// To read the media data from a specific asset track in the format in which it was stored, pass null to the settings parameter.
AVAssetReaderOutput output = AVAssetReaderTrackOutput.Create (audioTrack, (AudioSettings)null);
if (assetReader.CanAddOutput (output))
assetReader.AddOutput (output);
AVAssetWriterInput input = AVAssetWriterInput.Create (audioTrack.MediaType, (AudioSettings)null);
if (assetWriter.CanAddInput (input))
assetWriter.AddInput (input);
// Create and save an instance of ReadWriteSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
audioSampleBufferChannel = new AudioChannel(output, input);
}
public void DidReadAndWriteSampleBuffer (ReadWriteSampleBufferChannel sampleBufferChannel,
CMSampleBuffer sampleBuffer,
CVPixelBuffer sampleBufferForWrite)
{
// Calculate progress (scale of 0.0 to 1.0)
double progress = AVReaderWriter.ProgressOfSampleBufferInTimeRange(sampleBuffer, _timeRange);
_progressProc((float)progress * 100);
// Grab the pixel buffer from the sample buffer, if possible
CVImageBuffer imageBuffer = sampleBuffer.GetImageBuffer ();
var pixelBuffer = imageBuffer as CVPixelBuffer;
if (pixelBuffer != null)
Delegate.AdjustPixelBuffer (pixelBuffer, sampleBufferForWrite);
}
// TODO: where called in original sample
// - (void)cancel:(id)sender
private Task StartReadingAsync(ReadWriteSampleBufferChannel channel, AVReaderWriter handler)
{
var completionSrc = new TaskCompletionSource<object> ();
if (channel == null)
completionSrc.SetResult (null);
else
channel.StartWithAsync (completionSrc, handler);
return completionSrc.Task;
}
private void SetupAssetReaderWriterForAudio(AVAssetTrack audioTrack)
{
if (audioTrack == null)
return;
// Decompress to Linear PCM with the asset reader
AVAssetReaderOutput output = AVAssetReaderTrackOutput.Create (audioTrack, (AudioSettings)null);
_assetReader.AddOutput (output);
AVAssetWriterInput input = AVAssetWriterInput.Create (audioTrack.MediaType, (AudioSettings)null);
_assetWriter.AddInput (input);
// Create and save an instance of AAPLRWSampleBufferChannel,
// which will coordinate the work of reading and writing sample buffers
_audioSampleBufferChannel = new ReadWriteSampleBufferChannel (output, input, false);
}
