* AudioDeviceEnumerator.cs: Added missing file.
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Source/OpenTK/Audio/AudioDeviceEnumerator.cs
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Source/OpenTK/Audio/AudioDeviceEnumerator.cs
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#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.Collections.ObjectModel;
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using System.Diagnostics;
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namespace OpenTK.Audio
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{
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internal static class AudioDeviceEnumerator
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{
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#region All device strings
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private static readonly List<string> available_playback_devices = new List<string>();
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private static readonly List<string> available_recording_devices = new List<string>();
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internal static IList<string> AvailablePlaybackDevices
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{
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get
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{
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return available_playback_devices.AsReadOnly();
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}
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}
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internal static IList<string> AvailableRecordingDevices
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{
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get
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{
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return available_recording_devices.AsReadOnly();
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}
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}
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#endregion All device strings
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#region Default device strings
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private static string default_playback_device;
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internal static string DefaultPlaybackDevice
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{
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get
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{
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return default_playback_device;
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}
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}
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private static string default_recording_device;
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internal static string DefaultRecordingDevice
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{
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get
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{
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return default_recording_device;
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}
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}
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#endregion Default device strings
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#region Is OpenAL supported?
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private static bool openal_supported = true;
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internal static bool IsOpenALSupported
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{
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get
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{
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return openal_supported;
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}
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}
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#endregion Is OpenAL supported?
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#region Alc Version number
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internal enum AlcVersion
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{
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Alc1_0,
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Alc1_1
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}
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private static AlcVersion version;
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internal static AlcVersion Version
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{
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get
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{
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return version;
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}
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}
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#endregion Alc Version number
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#region static constructor
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/// <summary>Loads all available audio devices into the available_*_devices lists.</summary>
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static AudioDeviceEnumerator()
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{
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IntPtr dummy_device = IntPtr.Zero;
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ContextHandle dummy_context = ContextHandle.Zero;
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try
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{
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Debug.WriteLine("Enumerating audio devices.");
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Debug.Indent();
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// need a dummy context for correct results
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dummy_device = Alc.OpenDevice(null);
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dummy_context = Alc.CreateContext(dummy_device, (int[])null);
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bool dummy_success = Alc.MakeContextCurrent(dummy_context);
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AlcError dummy_error = Alc.GetError(dummy_device);
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if (!dummy_success || dummy_error != AlcError.NoError)
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{
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throw new AudioContextException("Failed to create dummy Context. Device (" + dummy_device.ToString() +
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") Context (" + dummy_context.Handle.ToString() +
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") MakeContextCurrent " + (dummy_success ? "succeeded" : "failed") +
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", Alc Error (" + dummy_error.ToString() + ") " + Alc.GetString(IntPtr.Zero, (AlcGetString)dummy_error));
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}
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// Get a list of all known playback devices, using best extension available
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if (Alc.IsExtensionPresent(IntPtr.Zero, "ALC_ENUMERATION_EXT"))
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{
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version = AlcVersion.Alc1_1;
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if (Alc.IsExtensionPresent(IntPtr.Zero, "ALC_ENUMERATE_ALL_EXT"))
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{
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available_playback_devices.AddRange(Alc.GetString(IntPtr.Zero, AlcGetStringList.AllDevicesSpecifier));
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default_playback_device = Alc.GetString(IntPtr.Zero, AlcGetString.DefaultAllDevicesSpecifier);
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}
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else
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{
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available_playback_devices.AddRange(Alc.GetString(IntPtr.Zero, AlcGetStringList.DeviceSpecifier));
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default_playback_device = Alc.GetString(IntPtr.Zero, AlcGetString.DefaultDeviceSpecifier);
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}
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}
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else
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{
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version = AlcVersion.Alc1_0;
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Debug.Print("Device enumeration extension not available. Failed to enumerate playback devices.");
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}
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AlcError playback_err = Alc.GetError(dummy_device);
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if (playback_err != AlcError.NoError)
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throw new AudioContextException("Alc Error occured when querying available playback devices. " + playback_err.ToString());
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// Get a list of all known recording devices, at least ALC_ENUMERATION_EXT is needed too
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if (version == AlcVersion.Alc1_1 && Alc.IsExtensionPresent(IntPtr.Zero, "ALC_EXT_CAPTURE"))
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{
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available_recording_devices.AddRange(Alc.GetString(IntPtr.Zero, AlcGetStringList.CaptureDeviceSpecifier));
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default_recording_device = Alc.GetString(IntPtr.Zero, AlcGetString.CaptureDefaultDeviceSpecifier);
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}
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else
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{
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Debug.Print("Capture extension not available. Failed to enumerate recording devices.");
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}
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AlcError record_err = Alc.GetError(dummy_device);
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if (record_err != AlcError.NoError)
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throw new AudioContextException("Alc Error occured when querying available recording devices. " + record_err.ToString());
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#if DEBUG
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Debug.WriteLine("Found playback devices:");
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foreach (string s in available_playback_devices)
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Debug.WriteLine(s);
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Debug.WriteLine("Default playback device: " + default_playback_device);
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Debug.WriteLine("Found recording devices:");
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foreach (string s in available_recording_devices)
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Debug.WriteLine(s);
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Debug.WriteLine("Default recording device: " + default_recording_device);
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#endif
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}
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catch (DllNotFoundException e)
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{
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Trace.WriteLine(e.ToString());
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openal_supported = false;
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}
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catch (AudioContextException ace)
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{
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Trace.WriteLine(ace.ToString());
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openal_supported = false;
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}
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finally
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{
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Debug.Unindent();
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// clean up the dummy context
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Alc.MakeContextCurrent(ContextHandle.Zero);
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if (dummy_context != ContextHandle.Zero && dummy_context.Handle != IntPtr.Zero)
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Alc.DestroyContext(dummy_context);
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if (dummy_device != IntPtr.Zero)
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Alc.CloseDevice(dummy_device);
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}
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}
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#endregion static constructor
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}
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}
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