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