public void Initialize(Xstream f)
{
_window = f;
_hwnd = f.GetHandle();
Initialize(SDL_RendererFlags.SDL_RENDERER_ACCELERATED
| SDL_RendererFlags.SDL_RENDERER_PRESENTVSYNC);
}
/*
* 这个samples是指样本帧中音频缓存区的大小。
* 样本帧是一块音频数据，其大小指定为 format * channels
* 其中format指的是每个样本的位数，这里使用WAVE_FORMAT_IEEE_FLOAT即4字节(32位)浮点型。
* 在PCM中format等同于sampleSize
*
* @see: https://my.oschina.net/u/4365632/blog/3319770
* https://wiki.libsdl.org/SDL_AudioSpec#Remarks
*/
public int Initialize(Xstream f, int samples)
{
_window = f;
_samples = samples;
_shutdown = false;// just in case.
_paused = true;
_enabled = true;
try
{
OpenDevice();
// pool a few packets to start. Enough for two callbacks.
_queue = DataQueuePacket.NewDataQueue(SDL_AUDIOBUFFERQUEUE_PACKETLEN, (size_t)(_bufferSize * 2));
// Allocate a scratch audio buffer
_worklen = _bufferSize;
_workbuf = (byte *)Marshal.AllocHGlobal(_worklen);
_thread = new Thread(RunAudio);
// The audio mixing is always a high priority thread
_thread.Priority = ThreadPriority.Highest;
// Start the audio thread
_thread.Start();
}
catch (Exception e)
{
Debug.WriteLine($"Failed to open audio: {e.Message}");
Close();
return(1);
}
Pause(0);// start audio playing.
return(0);
}
public bool Initialize(Xstream f)
{
_hwnd = f.GetHandle();
return(Initialize());
}