770 lines
30 KiB
C#
770 lines
30 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.Text;
|
|
using System.Diagnostics;
|
|
|
|
using OpenTK.Audio.OpenAL;
|
|
|
|
namespace OpenTK.Audio
|
|
{
|
|
/// <summary>
|
|
/// Provides methods to instantiate, use and destroy an audio context for playback.
|
|
/// Static methods are provided to list available devices known by the driver.
|
|
/// </summary>
|
|
public sealed class AudioContext : IDisposable
|
|
{
|
|
#region --- Fields ---
|
|
|
|
bool disposed;
|
|
bool is_processing, is_synchronized;
|
|
IntPtr device_handle;
|
|
ContextHandle context_handle;
|
|
bool context_exists;
|
|
|
|
string device_name;
|
|
static object audio_context_lock = new object();
|
|
static Dictionary<ContextHandle, AudioContext> available_contexts = new Dictionary<ContextHandle, AudioContext>();
|
|
|
|
#endregion
|
|
|
|
#region --- Constructors ---
|
|
|
|
#region static AudioContext()
|
|
|
|
/// \internal
|
|
/// <summary>
|
|
/// Runs before the actual class constructor, to load available devices.
|
|
/// </summary>
|
|
static AudioContext()
|
|
{
|
|
if (AudioDeviceEnumerator.IsOpenALSupported) // forces enumeration
|
|
{ }
|
|
}
|
|
|
|
#endregion static AudioContext()
|
|
|
|
#region public AudioContext()
|
|
|
|
/// <summary>Constructs a new AudioContext, using the default audio device.</summary>
|
|
public AudioContext()
|
|
: this(null, 0, 0, false, true, MaxAuxiliarySends.UseDriverDefault) { }
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device)
|
|
|
|
/// <summary>
|
|
/// Constructs a new AudioContext instance.
|
|
/// </summary>
|
|
/// <param name="device">The device name that will host this instance.</param>
|
|
public AudioContext(string device) : this(device, 0, 0, false, true, MaxAuxiliarySends.UseDriverDefault) { }
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device, int freq)
|
|
|
|
/// <summary>Constructs a new AudioContext, using the specified audio device and device parameters.</summary>
|
|
/// <param name="device">The name of the audio device to use.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <remarks>
|
|
/// Use AudioContext.AvailableDevices to obtain a list of all available audio devices.
|
|
/// devices.
|
|
/// </remarks>
|
|
public AudioContext(string device, int freq) : this(device, freq, 0, false, true, MaxAuxiliarySends.UseDriverDefault) { }
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device, int freq, int refresh)
|
|
|
|
/// <summary>Constructs a new AudioContext, using the specified audio device and device parameters.</summary>
|
|
/// <param name="device">The name of the audio device to use.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="refresh">Refresh intervals, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <remarks>
|
|
/// Use AudioContext.AvailableDevices to obtain a list of all available audio devices.
|
|
/// devices.
|
|
/// </remarks>
|
|
public AudioContext(string device, int freq, int refresh)
|
|
: this(device, freq, refresh, false, true, MaxAuxiliarySends.UseDriverDefault) { }
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device, int freq, int refresh, bool sync)
|
|
|
|
/// <summary>Constructs a new AudioContext, using the specified audio device and device parameters.</summary>
|
|
/// <param name="device">The name of the audio device to use.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="refresh">Refresh intervals, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="sync">Flag, indicating a synchronous context.</param>
|
|
/// <remarks>
|
|
/// Use AudioContext.AvailableDevices to obtain a list of all available audio devices.
|
|
/// devices.
|
|
/// </remarks>
|
|
public AudioContext(string device, int freq, int refresh, bool sync)
|
|
: this(AudioDeviceEnumerator.AvailablePlaybackDevices[0], freq, refresh, sync, true) { }
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device, int freq, int refresh, bool sync, bool enableEfx)
|
|
|
|
/// <summary>Creates the audio context using the specified device and device parameters.</summary>
|
|
/// <param name="device">The device descriptor obtained through AudioContext.AvailableDevices.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="refresh">Refresh intervals, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="sync">Flag, indicating a synchronous context.</param>
|
|
/// <param name="enableEfx">Indicates whether the EFX extension should be initialized, if present.</param>
|
|
/// <exception cref="ArgumentNullException">Occurs when the device string is invalid.</exception>
|
|
/// <exception cref="ArgumentOutOfRangeException">Occurs when a specified parameter is invalid.</exception>
|
|
/// <exception cref="AudioDeviceException">
|
|
/// Occurs when the specified device is not available, or is in use by another program.
|
|
/// </exception>
|
|
/// <exception cref="AudioContextException">
|
|
/// Occurs when an audio context could not be created with the specified parameters.
|
|
/// </exception>
|
|
/// <exception cref="NotSupportedException">
|
|
/// Occurs when an AudioContext already exists.</exception>
|
|
/// <remarks>
|
|
/// <para>For maximum compatibility, you are strongly recommended to use the default constructor.</para>
|
|
/// <para>Multiple AudioContexts are not supported at this point.</para>
|
|
/// <para>
|
|
/// The number of auxilliary EFX sends depends on the audio hardware and drivers. Most Realtek devices, as well
|
|
/// as the Creative SB Live!, support 1 auxilliary send. Creative's Audigy and X-Fi series support 4 sends.
|
|
/// Values higher than supported will be clamped by the driver.
|
|
/// </para>
|
|
/// </remarks>
|
|
public AudioContext(string device, int freq, int refresh, bool sync, bool enableEfx)
|
|
{
|
|
CreateContext(device, freq, refresh, sync, enableEfx, MaxAuxiliarySends.UseDriverDefault);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region public AudioContext(string device, int freq, int refresh, bool sync, bool enableEfx, MaxAuxiliarySends efxMaxAuxSends)
|
|
|
|
/// <summary>Creates the audio context using the specified device and device parameters.</summary>
|
|
/// <param name="device">The device descriptor obtained through AudioContext.AvailableDevices.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="refresh">Refresh intervals, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="sync">Flag, indicating a synchronous context.</param>
|
|
/// <param name="enableEfx">Indicates whether the EFX extension should be initialized, if present.</param>
|
|
/// <param name="efxMaxAuxSends">Requires EFX enabled. The number of desired Auxiliary Sends per source.</param>
|
|
/// <exception cref="ArgumentNullException">Occurs when the device string is invalid.</exception>
|
|
/// <exception cref="ArgumentOutOfRangeException">Occurs when a specified parameter is invalid.</exception>
|
|
/// <exception cref="AudioDeviceException">
|
|
/// Occurs when the specified device is not available, or is in use by another program.
|
|
/// </exception>
|
|
/// <exception cref="AudioContextException">
|
|
/// Occurs when an audio context could not be created with the specified parameters.
|
|
/// </exception>
|
|
/// <exception cref="NotSupportedException">
|
|
/// Occurs when an AudioContext already exists.</exception>
|
|
/// <remarks>
|
|
/// <para>For maximum compatibility, you are strongly recommended to use the default constructor.</para>
|
|
/// <para>Multiple AudioContexts are not supported at this point.</para>
|
|
/// <para>
|
|
/// The number of auxilliary EFX sends depends on the audio hardware and drivers. Most Realtek devices, as well
|
|
/// as the Creative SB Live!, support 1 auxilliary send. Creative's Audigy and X-Fi series support 4 sends.
|
|
/// Values higher than supported will be clamped by the driver.
|
|
/// </para>
|
|
/// </remarks>
|
|
public AudioContext(string device, int freq, int refresh, bool sync, bool enableEfx, MaxAuxiliarySends efxMaxAuxSends)
|
|
{
|
|
CreateContext(device, freq, refresh, sync, enableEfx, efxMaxAuxSends);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion --- Constructors ---
|
|
|
|
#region --- Private Methods ---
|
|
|
|
#region CreateContext
|
|
|
|
/// <summary>May be passed at context construction time to indicate the number of desired auxiliary effect slot sends per source.</summary>
|
|
public enum MaxAuxiliarySends:int
|
|
{
|
|
/// <summary>Will chose a reliably working parameter.</summary>
|
|
UseDriverDefault = 0,
|
|
/// <summary>One send per source.</summary>
|
|
One = 1,
|
|
/// <summary>Two sends per source.</summary>
|
|
Two = 2,
|
|
/// <summary>Three sends per source.</summary>
|
|
Three = 3,
|
|
/// <summary>Four sends per source.</summary>
|
|
Four = 4,
|
|
}
|
|
|
|
/// \internal
|
|
/// <summary>Creates the audio context using the specified device.</summary>
|
|
/// <param name="device">The device descriptor obtained through AudioContext.AvailableDevices, or null for the default device.</param>
|
|
/// <param name="freq">Frequency for mixing output buffer, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="refresh">Refresh intervals, in units of Hz. Pass 0 for driver default.</param>
|
|
/// <param name="sync">Flag, indicating a synchronous context.</param>
|
|
/// <param name="enableEfx">Indicates whether the EFX extension should be initialized, if present.</param>
|
|
/// <param name="efxAuxiliarySends">Requires EFX enabled. The number of desired Auxiliary Sends per source.</param>
|
|
/// <exception cref="ArgumentOutOfRangeException">Occurs when a specified parameter is invalid.</exception>
|
|
/// <exception cref="AudioDeviceException">
|
|
/// Occurs when the specified device is not available, or is in use by another program.
|
|
/// </exception>
|
|
/// <exception cref="AudioContextException">
|
|
/// Occurs when an audio context could not be created with the specified parameters.
|
|
/// </exception>
|
|
/// <exception cref="NotSupportedException">
|
|
/// Occurs when an AudioContext already exists.</exception>
|
|
/// <remarks>
|
|
/// <para>For maximum compatibility, you are strongly recommended to use the default constructor.</para>
|
|
/// <para>Multiple AudioContexts are not supported at this point.</para>
|
|
/// <para>
|
|
/// The number of auxilliary EFX sends depends on the audio hardware and drivers. Most Realtek devices, as well
|
|
/// as the Creative SB Live!, support 1 auxilliary send. Creative's Audigy and X-Fi series support 4 sends.
|
|
/// Values higher than supported will be clamped by the driver.
|
|
/// </para>
|
|
/// </remarks>
|
|
void CreateContext(string device, int freq, int refresh, bool sync, bool enableEfx, MaxAuxiliarySends efxAuxiliarySends)
|
|
{
|
|
if (!AudioDeviceEnumerator.IsOpenALSupported)
|
|
throw new DllNotFoundException("openal32.dll");
|
|
|
|
if (AudioDeviceEnumerator.Version == AudioDeviceEnumerator.AlcVersion.Alc1_1 && AudioDeviceEnumerator.AvailablePlaybackDevices.Count == 0) // Alc 1.0 does not support device enumeration.
|
|
throw new NotSupportedException("No audio hardware is available.");
|
|
if (context_exists) throw new NotSupportedException("Multiple AudioContexts are not supported.");
|
|
if (freq < 0) throw new ArgumentOutOfRangeException("freq", freq, "Should be greater than zero.");
|
|
if (refresh < 0) throw new ArgumentOutOfRangeException("refresh", refresh, "Should be greater than zero.");
|
|
|
|
|
|
if (!String.IsNullOrEmpty(device))
|
|
{
|
|
device_name = device;
|
|
device_handle = Alc.OpenDevice(device); // try to open device by name
|
|
}
|
|
if (device_handle == IntPtr.Zero)
|
|
{
|
|
device_name = "IntPtr.Zero (null string)";
|
|
device_handle = Alc.OpenDevice(null); // try to open unnamed default device
|
|
}
|
|
if (device_handle == IntPtr.Zero)
|
|
{
|
|
device_name = AudioContext.DefaultDevice;
|
|
device_handle = Alc.OpenDevice(AudioContext.DefaultDevice); // try to open named default device
|
|
}
|
|
if (device_handle == IntPtr.Zero)
|
|
{
|
|
device_name = "None";
|
|
throw new AudioDeviceException(String.Format("Audio device '{0}' does not exist or is tied up by another application.",
|
|
String.IsNullOrEmpty(device) ? "default" : device));
|
|
}
|
|
|
|
CheckErrors();
|
|
|
|
// Build the attribute list
|
|
List<int> attributes = new List<int>();
|
|
|
|
if (freq != 0)
|
|
{
|
|
attributes.Add((int)AlcContextAttributes.Frequency);
|
|
attributes.Add(freq);
|
|
}
|
|
|
|
if (refresh != 0)
|
|
{
|
|
attributes.Add((int)AlcContextAttributes.Refresh);
|
|
attributes.Add(refresh);
|
|
}
|
|
|
|
attributes.Add((int)AlcContextAttributes.Sync);
|
|
attributes.Add(sync ? 1 : 0);
|
|
|
|
if (enableEfx && Alc.IsExtensionPresent(device_handle, "ALC_EXT_EFX"))
|
|
{
|
|
int num_slots;
|
|
switch (efxAuxiliarySends)
|
|
{
|
|
case MaxAuxiliarySends.One:
|
|
case MaxAuxiliarySends.Two:
|
|
case MaxAuxiliarySends.Three:
|
|
case MaxAuxiliarySends.Four:
|
|
num_slots = (int)efxAuxiliarySends;
|
|
break;
|
|
default:
|
|
case MaxAuxiliarySends.UseDriverDefault:
|
|
Alc.GetInteger(device_handle, AlcGetInteger.EfxMaxAuxiliarySends, 1, out num_slots);
|
|
break;
|
|
}
|
|
|
|
attributes.Add((int)AlcContextAttributes.EfxMaxAuxiliarySends);
|
|
attributes.Add(num_slots);
|
|
}
|
|
attributes.Add(0);
|
|
|
|
context_handle = Alc.CreateContext(device_handle, attributes.ToArray());
|
|
|
|
if (context_handle == ContextHandle.Zero)
|
|
{
|
|
Alc.CloseDevice(device_handle);
|
|
throw new AudioContextException("The audio context could not be created with the specified parameters.");
|
|
}
|
|
|
|
CheckErrors();
|
|
|
|
// HACK: OpenAL SI on Linux/ALSA crashes on MakeCurrent. This hack avoids calling MakeCurrent when
|
|
// an old OpenAL version is detect - it may affect outdated OpenAL versions different than OpenAL SI,
|
|
// but it looks like a good compromise for now.
|
|
if (AudioDeviceEnumerator.AvailablePlaybackDevices.Count > 0)
|
|
MakeCurrent();
|
|
|
|
CheckErrors();
|
|
|
|
device_name = Alc.GetString(device_handle, AlcGetString.DeviceSpecifier);
|
|
|
|
|
|
lock (audio_context_lock)
|
|
{
|
|
available_contexts.Add(this.context_handle, this);
|
|
context_exists = true;
|
|
}
|
|
}
|
|
|
|
#endregion --- Private Methods ---
|
|
|
|
#region static void MakeCurrent(AudioContext context)
|
|
|
|
/// \internal
|
|
/// <summary>Makes the specified AudioContext current in the calling thread.</summary>
|
|
/// <param name="context">The OpenTK.Audio.AudioContext to make current, or null.</param>
|
|
/// <exception cref="ObjectDisposedException">
|
|
/// Occurs if this function is called after the AudioContext has been disposed.
|
|
/// </exception>
|
|
/// <exception cref="AudioContextException">
|
|
/// Occurs when the AudioContext could not be made current.
|
|
/// </exception>
|
|
static void MakeCurrent(AudioContext context)
|
|
{
|
|
lock (audio_context_lock)
|
|
{
|
|
if (!Alc.MakeContextCurrent(context != null ? context.context_handle : ContextHandle.Zero))
|
|
throw new AudioContextException(String.Format("ALC {0} error detected at {1}.",
|
|
Alc.GetError(context != null ? (IntPtr)context.context_handle : IntPtr.Zero).ToString(),
|
|
context != null ? context.ToString() : "null"));
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region internal bool IsCurrent
|
|
|
|
/// <summary>
|
|
/// Gets or sets a System.Boolean indicating whether the AudioContext
|
|
/// is current.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Only one AudioContext can be current in the application at any time,
|
|
/// <b>regardless of the number of threads</b>.
|
|
/// </remarks>
|
|
internal bool IsCurrent
|
|
{
|
|
get
|
|
{
|
|
lock (audio_context_lock)
|
|
{
|
|
if (available_contexts.Count == 0)
|
|
return false;
|
|
else
|
|
{
|
|
return AudioContext.CurrentContext == this;
|
|
}
|
|
}
|
|
}
|
|
set
|
|
{
|
|
if (value) AudioContext.MakeCurrent(this);
|
|
else AudioContext.MakeCurrent(null);
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IntPtr Device
|
|
|
|
IntPtr Device { get { return device_handle; } }
|
|
|
|
#endregion
|
|
|
|
#endregion
|
|
|
|
#region --- Public Members ---
|
|
|
|
#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()
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
new AudioDeviceErrorChecker(device_handle).Dispose();
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region CurrentError
|
|
|
|
/// <summary>
|
|
/// Returns the ALC error code for this instance.
|
|
/// </summary>
|
|
public AlcError CurrentError
|
|
{
|
|
get
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
return Alc.GetError(device_handle);
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region MakeCurrent
|
|
|
|
/// <summary>Makes the AudioContext current in the calling thread.</summary>
|
|
/// <exception cref="ObjectDisposedException">
|
|
/// Occurs if this function is called after the AudioContext has been disposed.
|
|
/// </exception>
|
|
/// <exception cref="AudioContextException">
|
|
/// Occurs when the AudioContext could not be made current.
|
|
/// </exception>
|
|
/// <remarks>
|
|
/// Only one AudioContext can be current in the application at any time,
|
|
/// <b>regardless of the number of threads</b>.
|
|
/// </remarks>
|
|
public void MakeCurrent()
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
AudioContext.MakeCurrent(this);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IsProcessing
|
|
|
|
/// <summary>
|
|
/// Gets a System.Boolean indicating whether the AudioContext is
|
|
/// currently processing audio events.
|
|
/// </summary>
|
|
/// <seealso cref="Process"/>
|
|
/// <seealso cref="Suspend"/>
|
|
public bool IsProcessing
|
|
{
|
|
get
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
return is_processing;
|
|
}
|
|
private set { is_processing = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IsSynchronized
|
|
|
|
/// <summary>
|
|
/// Gets a System.Boolean indicating whether the AudioContext is
|
|
/// synchronized.
|
|
/// </summary>
|
|
/// <seealso cref="Process"/>
|
|
public bool IsSynchronized
|
|
{
|
|
get
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
return is_synchronized;
|
|
}
|
|
private set { is_synchronized = value; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region public void Process
|
|
|
|
/// <summary>
|
|
/// Processes queued audio events.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// <para>
|
|
/// If AudioContext.IsSynchronized is true, this function will resume
|
|
/// the internal audio processing thread. If AudioContext.IsSynchronized is false,
|
|
/// you will need to call this function multiple times per second to process
|
|
/// audio events.
|
|
/// </para>
|
|
/// <para>
|
|
/// In some implementations this function may have no effect.
|
|
/// </para>
|
|
/// </remarks>
|
|
/// <exception cref="ObjectDisposedException">Occurs when this function is called after the AudioContext had been disposed.</exception>
|
|
/// <seealso cref="Suspend"/>
|
|
/// <seealso cref="IsProcessing"/>
|
|
/// <seealso cref="IsSynchronized"/>
|
|
public void Process()
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
Alc.ProcessContext(this.context_handle);
|
|
IsProcessing = true;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region public void Suspend
|
|
|
|
/// <summary>
|
|
/// Suspends processing of audio events.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// <para>
|
|
/// To avoid audio artifacts when calling this function, set audio gain to zero before
|
|
/// suspending an AudioContext.
|
|
/// </para>
|
|
/// <para>
|
|
/// In some implementations, it can be faster to suspend processing before changing
|
|
/// AudioContext state.
|
|
/// </para>
|
|
/// <para>
|
|
/// In some implementations this function may have no effect.
|
|
/// </para>
|
|
/// </remarks>
|
|
/// <exception cref="ObjectDisposedException">Occurs when this function is called after the AudioContext had been disposed.</exception>
|
|
/// <seealso cref="Process"/>
|
|
/// <seealso cref="IsProcessing"/>
|
|
/// <seealso cref="IsSynchronized"/>
|
|
public void Suspend()
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
Alc.SuspendContext(this.context_handle);
|
|
IsProcessing = false;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region public bool SupportsExtension(string extension)
|
|
|
|
/// <summary>
|
|
/// Checks whether the specified OpenAL extension is supported.
|
|
/// </summary>
|
|
/// <param name="extension">The name of the extension to check (e.g. "ALC_EXT_EFX").</param>
|
|
/// <returns>true if the extension is supported; false otherwise.</returns>
|
|
public bool SupportsExtension(string extension)
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
return Alc.IsExtensionPresent(this.Device, extension);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region CurrentDevice
|
|
|
|
/// <summary>
|
|
/// Gets a System.String with the name of the device used in this context.
|
|
/// </summary>
|
|
public string CurrentDevice
|
|
{
|
|
get
|
|
{
|
|
if (disposed)
|
|
throw new ObjectDisposedException(this.GetType().FullName);
|
|
|
|
return device_name;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion --- Public Members ---
|
|
|
|
#region --- Static Members ---
|
|
|
|
#region public static AudioContext CurrentContext
|
|
|
|
/// <summary>
|
|
/// Gets the OpenTK.Audio.AudioContext which is current in the application.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Only one AudioContext can be current in the application at any time,
|
|
/// <b>regardless of the number of threads</b>.
|
|
/// </remarks>
|
|
public static AudioContext CurrentContext
|
|
{
|
|
get
|
|
{
|
|
lock (audio_context_lock)
|
|
{
|
|
if (available_contexts.Count == 0)
|
|
return null;
|
|
else
|
|
{
|
|
AudioContext context;
|
|
AudioContext.available_contexts.TryGetValue(
|
|
(ContextHandle)Alc.GetCurrentContext(),
|
|
out context);
|
|
return context;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region AvailableDevices
|
|
|
|
/// <summary>
|
|
/// Returns a list of strings containing all known playback devices.
|
|
/// </summary>
|
|
public static IList<string> AvailableDevices
|
|
{
|
|
get
|
|
{
|
|
return AudioDeviceEnumerator.AvailablePlaybackDevices;
|
|
}
|
|
}
|
|
#endregion public static IList<string> AvailablePlaybackDevices
|
|
|
|
#region DefaultDevice
|
|
|
|
/// <summary>
|
|
/// Returns the name of the device that will be used as playback default.
|
|
/// </summary>
|
|
public static string DefaultDevice
|
|
{
|
|
get
|
|
{
|
|
return AudioDeviceEnumerator.DefaultPlaybackDevice;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion
|
|
|
|
#region --- IDisposable Members ---
|
|
|
|
/// <summary>
|
|
/// Disposes of the AudioContext, cleaning up all resources consumed by it.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
this.Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
void Dispose(bool manual)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
if (this.IsCurrent)
|
|
this.IsCurrent = false;
|
|
|
|
if (context_handle != ContextHandle.Zero)
|
|
{
|
|
available_contexts.Remove(context_handle);
|
|
Alc.DestroyContext(context_handle);
|
|
}
|
|
|
|
if (device_handle != IntPtr.Zero)
|
|
Alc.CloseDevice(device_handle);
|
|
|
|
if (manual)
|
|
{
|
|
}
|
|
disposed = true;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Finalizes this instance.
|
|
/// </summary>
|
|
~AudioContext()
|
|
{
|
|
this.Dispose(false);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region --- Overrides ---
|
|
|
|
/// <summary>
|
|
/// Calculates the hash code for this instance.
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
public override int GetHashCode()
|
|
{
|
|
return base.GetHashCode();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Compares this instance with another.
|
|
/// </summary>
|
|
/// <param name="obj">The instance to compare to.</param>
|
|
/// <returns>True, if obj refers to this instance; false otherwise.</returns>
|
|
public override bool Equals(object obj)
|
|
{
|
|
return base.Equals(obj);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns a <see cref="System.String"/> that desrcibes this instance.
|
|
/// </summary>
|
|
/// <returns>A <see cref="System.String"/> that desrcibes this instance.</returns>
|
|
public override string ToString()
|
|
{
|
|
return String.Format("{0} (handle: {1}, device: {2})",
|
|
this.device_name, this.context_handle, this.device_handle);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|