void PrepareAudioQueue(MonoTouch.CoreFoundation.CFUrl url)
{
AudioStreamBasicDescription audioFormat = new AudioStreamBasicDescription()
{
SampleRate = _samplingRate,
Format = AudioFormatType.LinearPCM,
FormatFlags = AudioFormatFlags.LinearPCMIsSignedInteger | AudioFormatFlags.LinearPCMIsBigEndian | AudioFormatFlags.LinearPCMIsPacked,
FramesPerPacket = 1,
ChannelsPerFrame = 1, // monoral
BitsPerChannel = 16, // 16-bit
BytesPerPacket = 2,
BytesPerFrame = 2,
Reserved = 0
};
_audioFile = AudioFile.Create(url, AudioFileType.AIFF, audioFormat, AudioFileFlags.EraseFlags);
_queue = new InputAudioQueue(audioFormat);
_queue.InputCompleted += new EventHandler <InputCompletedEventArgs>(_queue_InputCompleted);
_startingPacketCount = 0;
_numPacketsToWrite = 1024;
_bufferByteSize = (int)(_numPacketsToWrite * audioFormat.BytesPerPacket);
// preparing queue buffer
IntPtr bufferPtr;
for (int index = 0; index < 3; index++)
{
//_queue.AllocateBuffer(_bufferByteSize, out bufferPtr);
_queue.AllocateBufferWithPacketDescriptors(_bufferByteSize, _numPacketsToWrite, out bufferPtr);
_queue.EnqueueBuffer(bufferPtr, _bufferByteSize, null);
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
/*
var path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
path = System.IO.Path.Combine(path, "loop_stereo.aif"); // loop_mono.wav
if (!System.IO.File.Exists(path))
throw new ArgumentException("file not found; " + path);*/
_url = MonoTouch.CoreFoundation.CFUrl.FromFile("output.aif");
_player = new RemoteIOPlayThrough();
_playButton.TouchDown += new EventHandler(_playButton_TouchDown);
_stopButton.TouchDown += new EventHandler(_stopButton_TouchDown);
_player.Play();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
/*
* var path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
* path = System.IO.Path.Combine(path, "loop_stereo.aif"); // loop_mono.wav
* if (!System.IO.File.Exists(path))
* throw new ArgumentException("file not found; " + path);*/
_url = MonoTouch.CoreFoundation.CFUrl.FromFile("output.aif");
_player = new RemoteIOPlayThrough();
_playButton.TouchDown += new EventHandler(_playButton_TouchDown);
_stopButton.TouchDown += new EventHandler(_stopButton_TouchDown);
_player.Play();
}
public static ExtAudioFile OpenURL(MonoTouch.CoreFoundation.CFUrl url)
{
int err;
IntPtr ptr = new IntPtr();
unsafe {
err = ExtAudioFileOpenURL(url.Handle, (IntPtr)(&ptr));
}
if (err != 0)
{
throw new ArgumentException(String.Format("Error code:{0}", err));
}
if (ptr == IntPtr.Zero)
{
throw new InvalidOperationException("Can not get object instance");
}
return(new ExtAudioFile(ptr));
}
public static ExtAudioFile CreateWithURL(MonoTouch.CoreFoundation.CFUrl url,
AudioFileType fileType,
AudioStreamBasicDescription inStreamDesc,
//AudioChannelLayout channelLayout,
AudioFileFlags flag)
{
int err;
IntPtr ptr = new IntPtr();
unsafe {
err = ExtAudioFileCreateWithURL(url.Handle, fileType, ref inStreamDesc, IntPtr.Zero, (uint)flag,
(IntPtr)(&ptr));
}
if (err != 0)
{
throw new ArgumentException(String.Format("Error code:{0}", err));
}
if (ptr == IntPtr.Zero)
{
throw new InvalidOperationException("Can not get object instance");
}
return(new ExtAudioFile(ptr));
}
public AudioQueueRecorder(MonoTouch.CoreFoundation.CFUrl url)
{
_isRecording = false;
PrepareAudioQueue(url);
}