static AlDevice()
{
var ptr = ALC10.alcGetString(IntPtr.Zero, ALC10.ALC_DEFAULT_DEVICE_SPECIFIER);
if (ptr != IntPtr.Zero)
{
DefaultDeviceName = Marshal.PtrToStringAnsi(ptr);
}
}
/// <summary>
/// Get the available devices.
/// </summary>
public static IEnumerable <string> GetDevices()
{
var deviceList = ALC11.alcIsExtensionPresent(IntPtr.Zero, "ALC_ENUMERATE_ALL_EXT") ?
ALC10.alcGetString(IntPtr.Zero, ALC11.ALC_ALL_DEVICES_SPECIFIER) :
ALC10.alcGetString(IntPtr.Zero, ALC10.ALC_DEVICE_SPECIFIER);
var curString = Marshal.PtrToStringAnsi(deviceList);
while (!string.IsNullOrEmpty(curString))
{
yield return(curString);
deviceList += curString.Length + 1;
curString = Marshal.PtrToStringAnsi(deviceList);
}
}
public ReadOnlyCollection <Microphone> GetCaptureDevices()
{
IntPtr deviceList = ALC10.alcGetString(IntPtr.Zero, ALC11.ALC_CAPTURE_DEVICE_SPECIFIER);
List <Microphone> microphones = new List <Microphone>();
string curString = Marshal.PtrToStringAnsi(deviceList);
while (!String.IsNullOrEmpty(curString))
{
microphones.Add(new Microphone(curString));
deviceList += curString.Length + 1;
curString = Marshal.PtrToStringAnsi(deviceList);
}
return(new ReadOnlyCollection <Microphone>(microphones));
}
public ReadOnlyCollection <RendererDetail> GetDevices()
{
IntPtr deviceList = ALC10.alcGetString(IntPtr.Zero, ALC11.ALC_ALL_DEVICES_SPECIFIER);
List <RendererDetail> renderers = new List <RendererDetail>();
int i = 0;
string curString = Marshal.PtrToStringAnsi(deviceList);
while (!String.IsNullOrEmpty(curString))
{
renderers.Add(new RendererDetail(
curString,
i.ToString()
));
i += 1;
deviceList += curString.Length + 1;
curString = Marshal.PtrToStringAnsi(deviceList);
}
return(new ReadOnlyCollection <RendererDetail>(renderers));
}
static string[] QueryDevices(string label, int type)
{
// Clear error bit
AL10.alGetError();
// Returns a null separated list of strings, terminated by two nulls.
var devicesPtr = ALC10.alcGetString(IntPtr.Zero, type);
if (devicesPtr == IntPtr.Zero || AL10.alGetError() != AL10.AL_NO_ERROR)
{
Log.Write("sound", "Failed to query OpenAL device list using {0}", label);
return(new string[0]);
}
var devices = new List <string>();
var buffer = new List <byte>();
var offset = 0;
while (true)
{
var b = Marshal.ReadByte(devicesPtr, offset++);
if (b != 0)
{
buffer.Add(b);
continue;
}
// A null indicates termination of that string, so add that to our list.
devices.Add(Encoding.UTF8.GetString(buffer.ToArray()));
buffer.Clear();
// Two successive nulls indicates the end of the list.
if (Marshal.ReadByte(devicesPtr, offset) == 0)
{
break;
}
}
return(devices.ToArray());
}
// Helper function to call alcGetString() and translate the result
// Passing in In32.MaxValue for device will use the current device, or pass any other value to use that device pointer
public static string GetALCString(int param, int device = Int32.MaxValue)
{
var sPtr = ALC10.alcGetString((device == Int32.MaxValue) ? AudioEngine.Device : (IntPtr)device, param);
CheckALCError($"could not get ALC string param {param}");
if (sPtr == IntPtr.Zero)
{
return(null);
}
// We need to handle the string lists in a different way, as they dont play well with Marshal.PtrToStringAnsi()
// Scan through until a double null terminator is found, and return as a newline separated list
if (device == 0 && (param == ALC10.ALC_DEVICE_SPECIFIER || param == ALC11.ALC_CAPTURE_DEVICE_SPECIFIER || param == ALC11.ALC_ALL_DEVICES_SPECIFIER))
{
// Copy the string data to managed memory
byte[] charData = new byte[GetStringListPtrLength(sPtr)];
Marshal.Copy(sPtr, charData, 0, charData.Length);
// Find split indices for null characters
var splits = charData.Select((b, i) => b == 0 ? i : -1).Where(i => i != -1).ToList();
splits.Insert(0, -1); // Add the beginning of the first string (pos = 0)
splits.RemoveAt(splits.Count - 1); // Remove the secondary null terminator at the very end
// Create list of strings
List <string> strList = new List <string>();
for (int i = 0; i < (splits.Count - 1); ++i)
{
strList.Add(Encoding.ASCII.GetString(charData, splits[i] + 1, splits[i + 1] - splits[i] - 1));
}
// Return newline separated list
return(String.Join("\n", strList));
}
else
{
return(Marshal.PtrToStringAnsi(sPtr));
}
}
static string[] QueryDevices(string label, int type)
{
// Clear error bit
AL10.alGetError();
var devices = new List <string>();
var next = ALC10.alcGetString(IntPtr.Zero, type);
if (next == IntPtr.Zero || AL10.alGetError() != AL10.AL_NO_ERROR)
{
Log.Write("sound", "Failed to query OpenAL device list using {0}", label);
return(new string[] { });
}
do
{
var str = Marshal.PtrToStringAuto(next);
next += UnicodeEncoding.Default.GetByteCount(str) + 1;
devices.Add(str);
} while (Marshal.ReadByte(next) != 0);
return(devices.ToArray());
}
