public SDL2HardwareDeviceSession(SDL2HardwareDeviceDriver driver, IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount, float requestedVolume) : base(memoryManager, requestedSampleFormat, requestedSampleRate, requestedChannelCount)
{
_driver = driver;
_updateRequiredEvent = _driver.GetUpdateRequiredEvent();
_queuedBuffers = new ConcurrentQueue <SDL2AudioBuffer>();
_ringBuffer = new DynamicRingBuffer();
_callbackDelegate = Update;
_bytesPerFrame = BackendHelper.GetSampleSize(RequestedSampleFormat) * (int)RequestedChannelCount;
_nativeSampleFormat = SDL2HardwareDeviceDriver.GetSDL2Format(RequestedSampleFormat);
_sampleCount = uint.MaxValue;
_started = false;
_volume = requestedVolume;
}
int ISoundPcmDriver.Initialize(int freq, int format)
{
int result = 0;
this.sdlCallback = new SDL_AudioCallback(this.SdlCallback);
SDL_AudioSpec desired = new SDL_AudioSpec
{
freq = freq,
format = (ushort)format,
samples = SAMPLESIZE,
channels = 1,
userdata = IntPtr.Zero,
callback = this.sdlCallback,
};
SDL_AudioSpec obtained = default(SDL_AudioSpec);
//IntPtr desiredPtr = Marshal.AllocHGlobal(Marshal.SizeOf(desired));
IntPtr obtainedPtr = Marshal.AllocHGlobal(Marshal.SizeOf(obtained));
try
{
//Marshal.StructureToPtr(desired, desiredPtr, false);
result = SDL_OpenAudio(ref desired, obtainedPtr);
if (result == 0)
{
obtained = (SDL_AudioSpec)Marshal.PtrToStructure(obtainedPtr, typeof(SDL_AudioSpec));
// pauses callback
(this as ISoundPcmDriver).SetState(false);
}
else
{
Trace.WriteLine("pcthis.out_sdl_init(): unable to open audio.");
}
}
finally
{
//Marshal.FreeHGlobal(desiredPtr);
Marshal.FreeHGlobal(obtainedPtr);
}
return(result);
}
