private void EnsureAudioStreamSetup(AudioBuffer buffer)
{
uint bufferSampleCount = (uint)GetSampleCount(buffer);
bool needAudioSetup = _outputStream == 0 ||
(bufferSampleCount >= Constants.TargetSampleCount && bufferSampleCount < _sampleCount);
if (needAudioSetup)
{
_sampleCount = Math.Max(Constants.TargetSampleCount, bufferSampleCount);
uint newOutputStream = SDL2HardwareDeviceDriver.OpenStream(RequestedSampleFormat, RequestedSampleRate, RequestedChannelCount, _sampleCount, _callbackDelegate);
if (newOutputStream == 0)
{
// No stream in place, this is unexpected.
throw new InvalidOperationException($"OpenStream failed with error: \"{SDL_GetError()}\"");
}
else
{
if (_outputStream != 0)
{
SDL_CloseAudioDevice(_outputStream);
}
_outputStream = newOutputStream;
SDL_PauseAudioDevice(_outputStream, _started ? 0 : 1);
Logger.Info?.Print(LogClass.Audio, $"New audio stream setup with a target sample count of {_sampleCount}");
}
}
}
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;
}
