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);
}
// HACK: Change CMFormatDescription to CMVideoFormatDescription
public bool SetupAssetWriterVideoInput(CMVideoFormatDescription currentFormatDescription)
{
//Console.WriteLine ("Setting up Video Asset Writer");
float bitsPerPixel;
// HACK: Change VideoDimensions to Dimensions, as this type was changed to CMVideoFormatDescription
var dimensions = currentFormatDescription.Dimensions;
int numPixels = dimensions.Width * dimensions.Height;
int bitsPerSecond;
// Assume that lower-than-SD resolution are intended for streaming, and use a lower bitrate
bitsPerPixel = numPixels < (640 * 480) ? 4.05F : 11.4F;
bitsPerSecond = (int)(numPixels * bitsPerPixel);
NSDictionary videoCompressionSettings = new NSDictionary(
AVVideo.CodecKey, AVVideo.CodecH264,
AVVideo.WidthKey, dimensions.Width,
AVVideo.HeightKey, dimensions.Height,
AVVideo.CompressionPropertiesKey, new NSDictionary(
AVVideo.AverageBitRateKey, bitsPerSecond,
AVVideo.MaxKeyFrameIntervalKey, 30
)
);
if (assetWriter.CanApplyOutputSettings(videoCompressionSettings, AVMediaType.Video))
{
// HACK: Change NSDictionary into AVVideoSettingsCompressed created using that NSDictionary (videoCompressionSettings)
assetWriterVideoIn = new AVAssetWriterInput(AVMediaType.Video, new AVVideoSettingsCompressed(videoCompressionSettings));
assetWriterVideoIn.ExpectsMediaDataInRealTime = true;
assetWriterVideoIn.Transform = TransformFromCurrentVideoOrientationToOrientation(ReferenceOrientation);
if (assetWriter.CanAddInput(assetWriterVideoIn))
{
assetWriter.AddInput(assetWriterVideoIn);
}
else
{
Console.WriteLine("Couldn't add asset writer video input.");
return(false);
}
}
else
{
Console.WriteLine("Couldn't apply video output settings.");
}
return(true);
}
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);
}
public bool StartRecording()
{
try
{
session = MaybeInitializeSession();
if (session == null)
{
Failure.Alert("Couldn't initialize session");
return false;
}
writer = MaybeInitializeAssetWriter();
if (writer == null)
{
Failure.Alert("Couldn't initialize writer");
return false;
}
inputWriter = MaybeInitializeInputWriter();
if (inputWriter == null)
{
Failure.Alert("Couldn't initialize input writer");
return false;
}
if (!writer.CanAddInput(inputWriter))
{
Failure.Alert("Couldn't add input writer to writer");
return false;
}
writer.AddInput(inputWriter);
session.StartRunning();
return true;
}
catch (Exception x)
{
Failure.Alert(x.Message);
return false;
}
}
public Compression CompressVideo(NSUrl source, NSUrl destination, bool isMinBitRateEnabled = true, VideoQuality quality = VideoQuality.high, bool keepOriginalResolution = false)
{
var frameCount = 0;
var compressionOperation = new Compression();
var videoAsset = new AVUrlAsset(source);
try
{
var videoTrack = videoAsset.Tracks.First(x => x.MediaType == AVMediaType.Video);
var bitrate = videoTrack.EstimatedDataRate;
// Check for a min video bitrate before compression
if (isMinBitRateEnabled && bitrate <= MIN_BITRATE)
{
var error = new Compression();
error.title = "The provided bitrate is smaller than what is needed for compression try to set isMinBitRateEnabled to false";
//TODO: ENVIAR ENVENTO DE ERRO
return(error);
}
var newBitrate = getBitrate(bitrate, quality);
// Handle new width and height values
var videoSize = videoTrack.NaturalSize;
var size = generateWidthAndHeight(videoSize.Width, videoSize.Height, keepOriginalResolution);
var newWidth = size.Width;
var newHeight = size.Height;
// Total Frames
var durationInSeconds = videoAsset.Duration.Seconds;
var frameRate = videoTrack.NominalFrameRate;
var totalFrames = Math.Ceiling(durationInSeconds * (double)(frameRate));
// Progress
var totalUnits = Convert.ToInt64(totalFrames);
//var progress = NSProgress(totalUnits);
// Setup video writer input
var videoWriterInput = new AVAssetWriterInput(AVMediaType.Video, getVideoWriterSettings(newBitrate, newWidth, newHeight));
videoWriterInput.ExpectsMediaDataInRealTime = true;
videoWriterInput.Transform = videoTrack.PreferredTransform;
NSError nSError;
var videoWriter = new AVAssetWriter(destination, AVFileType.QuickTimeMovie, out nSError);
videoWriter.AddInput(videoWriterInput);
var videoReaderSettings = new NSDictionary(
"PixelFormatType", new NSNumber(875704438)
);
var videoReaderOutput = new AVAssetReaderTrackOutput(videoTrack, videoReaderSettings);
AVAssetReader videoReader;
try
{
videoReader = new AVAssetReader(videoAsset, out nSError);
videoReader.AddOutput(videoReaderOutput);
}
catch
{
Console.WriteLine("video reader error: (error)");
//TODO - Chamar eventi de erro
}
//TODO: Verificar como passar parametro nil
var audioSettings = new AudioSettings()
{
//EncoderBitRate = 64000,
//Format = AudioToolbox.AudioFormatType.,
NumberChannels = 1,
//SampleRate = 44100
};
var audioWriterInput = new AVAssetWriterInput(AVMediaType.Audio, audioSettings);
audioWriterInput.ExpectsMediaDataInRealTime = false;
videoWriter.AddInput(audioWriterInput);
//setup audio reader
var audioTrack = videoAsset.Tracks.FirstOrDefault(x => x.MediaType == AVMediaType.Audio);
var audioReaderOutput = new AVAssetReaderTrackOutput(audioTrack, audioSettings);
var audioReader = new AVAssetReader(videoAsset, out nSError);
audioReader.AddOutput(audioReaderOutput);
videoWriter.StartWriting();
}
catch (Exception ex)
{
//TODO: Incluir tratamento de erro
return(new Compression());
}
return(new Compression());
}
public bool SetupAssetWriterVideoInput(CMFormatDescription currentFormatDescription)
{
//Console.WriteLine ("Setting up Video Asset Writer");
float bitsPerPixel;
var dimensions = currentFormatDescription.VideoDimensions;
int numPixels = dimensions.Width * dimensions.Height;
int bitsPerSecond;
// Assume that lower-than-SD resolution are intended for streaming, and use a lower bitrate
bitsPerPixel = numPixels < (640 * 480) ? 4.05F : 11.4F;
bitsPerSecond = (int)(numPixels * bitsPerPixel);
NSDictionary videoCompressionSettings = NSDictionary.FromObjectsAndKeys(
new NSObject[]
{ // The Compression Settings Values
AVVideo.CodecH264,
NSNumber.FromInt32(dimensions.Width),
NSNumber.FromInt32(dimensions.Height),
NSDictionary.FromObjectsAndKeys(
new object[]
{ // Compression Property Values
NSNumber.FromInt32(bitsPerSecond),
NSNumber.FromInt32(30)
},
new object[]
{ // Compression Property Keys
AVVideo.AverageBitRateKey,
AVVideo.MaxKeyFrameIntervalKey
})
},
new NSObject[]
{ // The Compression Settings Keys
AVVideo.CodecKey,
AVVideo.WidthKey,
AVVideo.HeightKey,
AVVideo.CompressionPropertiesKey
}
);
if (assetWriter.CanApplyOutputSettings(videoCompressionSettings, AVMediaType.Video))
{
assetWriterVideoIn = new AVAssetWriterInput(AVMediaType.Video, videoCompressionSettings);
assetWriterVideoIn.ExpectsMediaDataInRealTime = true;
assetWriterVideoIn.Transform = TransformFromCurrentVideoOrientationToOrientation(ReferenceOrientation);
if (assetWriter.CanAddInput(assetWriterVideoIn))
{
assetWriter.AddInput(assetWriterVideoIn);
}
else
{
Console.WriteLine("Couldn't add asset writer video input.");
return(false);
}
}
else
{
Console.WriteLine("Couldn't apply video output settings.");
}
return(true);
}