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using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Runtime.InteropServices;
#if IPHONE || WINDOWS
using OpenTK.Audio.OpenAL;
using OpenTK;
#elif MONOMAC
using MonoMac.OpenAL;
#endif
namespace Microsoft.Xna.Framework.Audio
{
internal sealed class OpenALSoundController : IDisposable
{
static OpenALSoundController _instance = null;
IntPtr _device;
ContextHandle _context;
//int outputSource;
//int[] buffers;
AlcError _lastOpenALError;
int[] allSourcesArray;
const int MAX_NUMBER_OF_SOURCES = 32;
const double PREFERRED_MIX_RATE = 44100;
HashSet<int> availableSourcesCollection;
HashSet<OALSoundBuffer> inUseSourcesCollection;
HashSet<OALSoundBuffer> playingSourcesCollection;
private OpenALSoundController ()
{
#if MACOSX || IPHONE
alcMacOSXMixerOutputRate(PREFERRED_MIX_RATE);
#endif
_device = Alc.OpenDevice (string.Empty);
CheckALError ("Could not open AL device");
if (_device != IntPtr.Zero) {
int[] attribute = new int[0];
_context = Alc.CreateContext (_device, attribute);
CheckALError ("Could not open AL context");
if (_context != ContextHandle.Zero) {
Alc.MakeContextCurrent (_context);
CheckALError ("Could not make AL context current");
}
} else {
return;
}
allSourcesArray = new int[MAX_NUMBER_OF_SOURCES];
AL.GenSources (allSourcesArray);
availableSourcesCollection = new HashSet<int> ();
inUseSourcesCollection = new HashSet<OALSoundBuffer> ();
playingSourcesCollection = new HashSet<OALSoundBuffer> ();
for (int x=0; x < MAX_NUMBER_OF_SOURCES; x++) {
availableSourcesCollection.Add (allSourcesArray [x]);
}
}
public static OpenALSoundController GetInstance {
get {
if (_instance == null)
_instance = new OpenALSoundController ();
return _instance;
}
}
public void CheckALError (string operation)
{
_lastOpenALError = Alc.GetError (_device);
if (_lastOpenALError == AlcError.NoError) {
return;
}
string errorFmt = "OpenAL Error: {0}";
Console.WriteLine (String.Format ("{0} - {1}",
operation,
//string.Format (errorFmt, Alc.GetString (_device, _lastOpenALError))));
string.Format (errorFmt, _lastOpenALError)));
}
private void CleanUpOpenAL ()
{
Alc.MakeContextCurrent (ContextHandle.Zero);
if (_context != ContextHandle.Zero) {
Alc.DestroyContext (_context);
_context = ContextHandle.Zero;
}
if (_device != IntPtr.Zero) {
Alc.CloseDevice (_device);
_device = IntPtr.Zero;
}
}
public void Dispose ()
{
CleanUpOpenAL ();
}
public bool ReserveSource (OALSoundBuffer soundBuffer)
{
int sourceNumber;
if (availableSourcesCollection.Count == 0) {
soundBuffer.SourceId = 0;
return false;
}
sourceNumber = availableSourcesCollection.First ();
soundBuffer.SourceId = sourceNumber;
inUseSourcesCollection.Add (soundBuffer);
availableSourcesCollection.Remove (sourceNumber);
//sourceId = sourceNumber;
return true;
}
public void RecycleSource (OALSoundBuffer soundBuffer)
{
inUseSourcesCollection.Remove (soundBuffer);
availableSourcesCollection.Add (soundBuffer.SourceId);
soundBuffer.RecycleSoundBuffer();
}
public void PlaySound (OALSoundBuffer soundBuffer)
{
playingSourcesCollection.Add (soundBuffer);
AL.SourcePlay (soundBuffer.SourceId);
}
public void StopSound (OALSoundBuffer soundBuffer)
{
AL.SourceStop (soundBuffer.SourceId);
AL.Source (soundBuffer.SourceId,ALSourcei.Buffer, 0);
playingSourcesCollection.Remove (soundBuffer);
RecycleSource (soundBuffer);
}
public void PauseSound (OALSoundBuffer soundBuffer)
{
AL.SourcePause (soundBuffer.SourceId);
}
public bool IsState (OALSoundBuffer soundBuffer, int state)
{
int sourceState;
AL.GetSource (soundBuffer.SourceId, ALGetSourcei.SourceState, out sourceState);
if (state == sourceState) {
return true;
}
return false;
}
public double SourceCurrentPosition (int sourceId)
{
int pos;
AL.GetSource (sourceId, ALGetSourcei.SampleOffset, out pos);
return pos;
}
public void Update ()
{
HashSet<OALSoundBuffer> purgeMe = new HashSet<OALSoundBuffer> ();
ALSourceState state;
foreach (var soundBuffer in playingSourcesCollection) {
state = AL.GetSourceState (soundBuffer.SourceId);
if (state == ALSourceState.Stopped) {
AL.Source (soundBuffer.SourceId, ALSourcei.Buffer, 0);
purgeMe.Add (soundBuffer);
//Console.WriteLine ("to be recycled: " + soundBuffer.SourceId);
}
}
foreach (var soundBuffer in purgeMe) {
playingSourcesCollection.Remove (soundBuffer);
RecycleSource (soundBuffer);
}
}
#if MACOSX || IPHONE
public const string OpenALLibrary = "/System/Library/Frameworks/OpenAL.framework/OpenAL";
[DllImport(OpenALLibrary, EntryPoint = "alcMacOSXMixerOutputRate")]
static extern void alcMacOSXMixerOutputRate (double rate); // caution
#endif
}
}
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