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