412 lines
14 KiB
C#
412 lines
14 KiB
C#
#region License
|
|
//
|
|
// The Open Toolkit Library License
|
|
//
|
|
// Copyright (c) 2006 - 2009 the Open Toolkit library.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights to
|
|
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
// the Software, and to permit persons to whom the Software is furnished to do
|
|
// so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
// OTHER DEALINGS IN THE SOFTWARE.
|
|
//
|
|
#endregion
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Diagnostics;
|
|
using System.Runtime.InteropServices;
|
|
|
|
using OpenTK.Audio.OpenAL;
|
|
|
|
namespace OpenTK.Audio
|
|
{
|
|
|
|
/// <summary>
|
|
/// Provides methods to instantiate, use and destroy an audio device for recording.
|
|
/// Static methods are provided to list available devices known by the driver.
|
|
/// </summary>
|
|
public sealed class AudioCapture : IDisposable
|
|
{
|
|
#region Fields
|
|
|
|
// This must stay private info so the end-user cannot call any Alc commands for the recording device.
|
|
IntPtr Handle;
|
|
|
|
// Alc.CaptureStop should be called prior to device shutdown, this keeps track of Alc.CaptureStart/Stop calls.
|
|
bool _isrecording = false;
|
|
|
|
ALFormat sample_format;
|
|
int sample_frequency;
|
|
|
|
#endregion
|
|
|
|
#region Constructors
|
|
|
|
static AudioCapture()
|
|
{
|
|
if (AudioDeviceEnumerator.IsOpenALSupported) // forces enumeration
|
|
{
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Opens the default device for audio recording.
|
|
/// Implicitly set parameters are: 22050Hz, 16Bit Mono, 4096 samples ringbuffer.
|
|
/// </summary>
|
|
public AudioCapture()
|
|
: this(AudioCapture.DefaultDevice, 22050, ALFormat.Mono16, 4096)
|
|
{
|
|
}
|
|
|
|
/// <summary>Opens a device for audio recording.</summary>
|
|
/// <param name="deviceName">The device name.</param>
|
|
/// <param name="frequency">The frequency that the data should be captured at.</param>
|
|
/// <param name="sampleFormat">The requested capture buffer format.</param>
|
|
/// <param name="bufferSize">The size of OpenAL's capture internal ring-buffer. This value expects number of samples, not bytes.</param>
|
|
public AudioCapture(string deviceName, int frequency, ALFormat sampleFormat, int bufferSize)
|
|
{
|
|
if (!AudioDeviceEnumerator.IsOpenALSupported)
|
|
throw new DllNotFoundException("openal32.dll");
|
|
if (frequency <= 0)
|
|
throw new ArgumentOutOfRangeException("frequency");
|
|
if (bufferSize <= 0)
|
|
throw new ArgumentOutOfRangeException("bufferSize");
|
|
|
|
// Try to open specified device. If it fails, try to open default device.
|
|
device_name = deviceName;
|
|
Handle = Alc.CaptureOpenDevice(deviceName, frequency, sampleFormat, bufferSize);
|
|
|
|
if (Handle == IntPtr.Zero)
|
|
{
|
|
Debug.WriteLine(ErrorMessage(deviceName, frequency, sampleFormat, bufferSize));
|
|
device_name = "IntPtr.Zero";
|
|
Handle = Alc.CaptureOpenDevice(null, frequency, sampleFormat, bufferSize);
|
|
}
|
|
|
|
if (Handle == IntPtr.Zero)
|
|
{
|
|
Debug.WriteLine(ErrorMessage("IntPtr.Zero", frequency, sampleFormat, bufferSize));
|
|
device_name = AudioDeviceEnumerator.DefaultRecordingDevice;
|
|
Handle = Alc.CaptureOpenDevice(AudioDeviceEnumerator.DefaultRecordingDevice, frequency, sampleFormat, bufferSize);
|
|
}
|
|
|
|
if (Handle == IntPtr.Zero)
|
|
{
|
|
// Everything we tried failed. Capture may not be supported, bail out.
|
|
Debug.WriteLine(ErrorMessage(AudioDeviceEnumerator.DefaultRecordingDevice, frequency, sampleFormat, bufferSize));
|
|
device_name = "None";
|
|
|
|
throw new AudioDeviceException("All attempts to open capture devices returned IntPtr.Zero. See debug log for verbose list.");
|
|
}
|
|
|
|
// handle is not null, check for some Alc Error
|
|
CheckErrors();
|
|
|
|
SampleFormat = sampleFormat;
|
|
SampleFrequency = frequency;
|
|
}
|
|
|
|
#endregion Constructor
|
|
|
|
#region Public Members
|
|
|
|
#region CurrentDevice
|
|
|
|
private string device_name;
|
|
|
|
/// <summary>
|
|
/// The name of the device associated with this instance.
|
|
/// </summary>
|
|
public string CurrentDevice
|
|
{
|
|
get
|
|
{
|
|
return device_name;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region AvailableDevices
|
|
|
|
/// <summary>
|
|
/// Returns a list of strings containing all known recording devices.
|
|
/// </summary>
|
|
public static IList<string> AvailableDevices
|
|
{
|
|
get
|
|
{
|
|
return AudioDeviceEnumerator.AvailableRecordingDevices;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region DefaultDevice
|
|
|
|
/// <summary>
|
|
/// Returns the name of the device that will be used as recording default.
|
|
/// </summary>
|
|
public static string DefaultDevice
|
|
{
|
|
get
|
|
{
|
|
return AudioDeviceEnumerator.DefaultRecordingDevice;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region CheckErrors
|
|
|
|
/// <summary>
|
|
/// Checks for ALC error conditions.
|
|
/// </summary>
|
|
/// <exception cref="OutOfMemoryException">Raised when an out of memory error is detected.</exception>
|
|
/// <exception cref="AudioValueException">Raised when an invalid value is detected.</exception>
|
|
/// <exception cref="AudioDeviceException">Raised when an invalid device is detected.</exception>
|
|
/// <exception cref="AudioContextException">Raised when an invalid context is detected.</exception>
|
|
public void CheckErrors()
|
|
{
|
|
new AudioDeviceErrorChecker(Handle).Dispose();
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region CurrentError
|
|
|
|
/// <summary>Returns the ALC error code for this device.</summary>
|
|
public AlcError CurrentError
|
|
{
|
|
get
|
|
{
|
|
return Alc.GetError(Handle);
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Start & Stop
|
|
|
|
/// <summary>
|
|
/// Start recording samples.
|
|
/// The number of available samples can be obtained through the <see cref="AvailableSamples"/> property.
|
|
/// The data can be queried with any <see cref="ReadSamples"/> method.
|
|
/// </summary>
|
|
public void Start()
|
|
{
|
|
Alc.CaptureStart(Handle);
|
|
_isrecording = true;
|
|
}
|
|
|
|
/// <summary>Stop recording samples. This will not clear previously recorded samples.</summary>
|
|
public void Stop()
|
|
{
|
|
Alc.CaptureStop(Handle);
|
|
_isrecording = false;
|
|
}
|
|
|
|
#endregion Start & Stop Capture
|
|
|
|
#region AvailableSamples
|
|
|
|
/// <summary>Returns the number of available samples for capture.</summary>
|
|
public int AvailableSamples
|
|
{
|
|
get
|
|
{
|
|
// TODO: Investigate inconsistency between documentation and actual usage.
|
|
// Doc claims the 3rd param is Number-of-Bytes, but it appears to be Number-of-Int32s
|
|
int result;
|
|
Alc.GetInteger(Handle, AlcGetInteger.CaptureSamples, 1, out result);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
#endregion Available samples property
|
|
|
|
#region ReadSamples
|
|
|
|
/// <summary>Fills the specified buffer with samples from the internal capture ring-buffer. This method does not block: it is an error to specify a sampleCount larger than AvailableSamples.</summary>
|
|
/// <param name="buffer">A pointer to a previously initialized and pinned array.</param>
|
|
/// <param name="sampleCount">The number of samples to be written to the buffer.</param>
|
|
public void ReadSamples(IntPtr buffer, int sampleCount)
|
|
{
|
|
Alc.CaptureSamples(Handle, buffer, sampleCount);
|
|
}
|
|
|
|
/// <summary>Fills the specified buffer with samples from the internal capture ring-buffer. This method does not block: it is an error to specify a sampleCount larger than AvailableSamples.</summary>
|
|
/// <param name="buffer">The buffer to fill.</param>
|
|
/// <param name="sampleCount">The number of samples to be written to the buffer.</param>
|
|
/// <exception cref="System.ArgumentNullException">Raised when buffer is null.</exception>
|
|
/// <exception cref="System.ArgumentOutOfRangeException">Raised when sampleCount is larger than the buffer.</exception>
|
|
public void ReadSamples<TBuffer>(TBuffer[] buffer, int sampleCount)
|
|
where TBuffer : struct
|
|
{
|
|
if (buffer == null)
|
|
throw new ArgumentNullException("buffer");
|
|
|
|
int buffer_size = BlittableValueType<TBuffer>.Stride * buffer.Length;
|
|
// This is more of a heuristic than a 100% valid check. However, it will work
|
|
// correctly for 99.9% of all use cases.
|
|
// This should never produce a false positive, but a false negative might
|
|
// be produced with compressed sample formats (which are very rare).
|
|
// Still, this is better than no check at all.
|
|
if (sampleCount * GetSampleSize(SampleFormat) > buffer_size)
|
|
throw new ArgumentOutOfRangeException("sampleCount");
|
|
|
|
GCHandle buffer_ptr = GCHandle.Alloc(buffer, GCHandleType.Pinned);
|
|
try { ReadSamples(buffer_ptr.AddrOfPinnedObject(), sampleCount); }
|
|
finally { buffer_ptr.Free(); }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region SampleFormat & SampleFrequency
|
|
|
|
/// <summary>
|
|
/// Gets the OpenTK.Audio.ALFormat for this instance.
|
|
/// </summary>
|
|
public ALFormat SampleFormat
|
|
{
|
|
get { return sample_format; }
|
|
private set { sample_format = value; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the sampling rate for this instance.
|
|
/// </summary>
|
|
public int SampleFrequency
|
|
{
|
|
get { return sample_frequency; }
|
|
private set { sample_frequency = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IsRunning
|
|
|
|
/// <summary>
|
|
/// Gets a value indicating whether this instance is currently capturing samples.
|
|
/// </summary>
|
|
public bool IsRunning
|
|
{
|
|
get { return _isrecording; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion
|
|
|
|
#region Private Members
|
|
|
|
// Retrieves the sample size in bytes for various ALFormats.
|
|
// Compressed formats always return 1.
|
|
static int GetSampleSize(ALFormat format)
|
|
{
|
|
switch (format)
|
|
{
|
|
case ALFormat.Mono8: return 1;
|
|
case ALFormat.Mono16: return 2;
|
|
case ALFormat.Stereo8: return 2;
|
|
case ALFormat.Stereo16: return 4;
|
|
case ALFormat.MonoFloat32Ext: return 4;
|
|
case ALFormat.MonoDoubleExt: return 8;
|
|
case ALFormat.StereoFloat32Ext: return 8;
|
|
case ALFormat.StereoDoubleExt: return 16;
|
|
|
|
case ALFormat.MultiQuad8Ext: return 4;
|
|
case ALFormat.MultiQuad16Ext: return 8;
|
|
case ALFormat.MultiQuad32Ext: return 16;
|
|
|
|
case ALFormat.Multi51Chn8Ext: return 6;
|
|
case ALFormat.Multi51Chn16Ext: return 12;
|
|
case ALFormat.Multi51Chn32Ext: return 24;
|
|
|
|
case ALFormat.Multi61Chn8Ext: return 7;
|
|
case ALFormat.Multi71Chn16Ext: return 14;
|
|
case ALFormat.Multi71Chn32Ext: return 28;
|
|
|
|
case ALFormat.MultiRear8Ext: return 1;
|
|
case ALFormat.MultiRear16Ext: return 2;
|
|
case ALFormat.MultiRear32Ext: return 4;
|
|
|
|
default: return 1; // Unknown sample size.
|
|
}
|
|
}
|
|
|
|
// Converts an error code to an error string with additional information.
|
|
string ErrorMessage(string devicename, int frequency, ALFormat bufferformat, int buffersize)
|
|
{
|
|
string alcerrmsg;
|
|
AlcError alcerrcode = CurrentError;
|
|
switch (alcerrcode)
|
|
{
|
|
case AlcError.OutOfMemory:
|
|
alcerrmsg = alcerrcode.ToString() + ": The specified device is invalid, or can not capture audio.";
|
|
break;
|
|
case AlcError.InvalidValue:
|
|
alcerrmsg = alcerrcode.ToString() + ": One of the parameters has an invalid value.";
|
|
break;
|
|
default:
|
|
alcerrmsg = alcerrcode.ToString();
|
|
break;
|
|
}
|
|
return "The handle returned by Alc.CaptureOpenDevice is null." +
|
|
"\nAlc Error: " + alcerrmsg +
|
|
"\nDevice Name: " + devicename +
|
|
"\nCapture frequency: " + frequency +
|
|
"\nBuffer format: " + bufferformat +
|
|
"\nBuffer Size: " + buffersize;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
|
|
~AudioCapture()
|
|
{
|
|
Dispose();
|
|
}
|
|
|
|
private bool IsDisposed;
|
|
|
|
/// <summary>Closes the device and disposes the instance.</summary>
|
|
public void Dispose()
|
|
{
|
|
this.Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
private void Dispose(bool manual)
|
|
{
|
|
if (!this.IsDisposed)
|
|
{
|
|
if (this.Handle != IntPtr.Zero)
|
|
{
|
|
if (this._isrecording)
|
|
this.Stop();
|
|
|
|
Alc.CaptureCloseDevice(this.Handle);
|
|
}
|
|
this.IsDisposed = true;
|
|
}
|
|
}
|
|
|
|
#endregion Destructor
|
|
}
|
|
}
|