public DirectSound(
Form form,
int sampleRate,
int bufferCount)
{
if ((sampleRate % 50) != 0)
{
throw new ArgumentOutOfRangeException("sampleRate", "Sample rate must be a multiple of 50!");
}
_sampleRate = sampleRate;
var bufferSize = sampleRate / 50;
for (int i = 0; i < bufferCount; i++)
{
_fillQueue.Enqueue(new uint[bufferSize]);
}
_bufferSize = bufferSize;
_bufferCount = bufferCount;
_zeroValue = 0;
var hWnd = form != null ? form.Handle : IntPtr.Zero;
_device = new DirectSound8();
_device.SetCooperativeLevel(hWnd, DSSCL.PRIORITY);
// we always use 16 bit stereo (uint per sample)
const short channels = 2;
const short bitsPerSample = 16;
const int sampleSize = 4; // channels * (bitsPerSample / 8);
var wf = new WaveFormat(_sampleRate, bitsPerSample, channels);
// Create a buffer
var bufferDesc = new DSBUFFERDESC();
bufferDesc.dwBufferBytes = _bufferSize * sampleSize * _bufferCount;
bufferDesc.dwFlags =
DSBCAPS_FLAGS.CTRLVOLUME |
DSBCAPS_FLAGS.CTRLPOSITIONNOTIFY |
DSBCAPS_FLAGS.GLOBALFOCUS |
DSBCAPS_FLAGS.GETCURRENTPOSITION2;
bufferDesc.Format = wf;
_soundBuffer = new SecondarySoundBuffer(_device, bufferDesc);
var posNotify = new DSBPOSITIONNOTIFY[_bufferCount];
for (int i = 0; i < posNotify.Length; i++)
{
posNotify[i] = new DSBPOSITIONNOTIFY();
posNotify[i].dwOffset = i * _bufferSize * sampleSize;
posNotify[i].WaitHandle = _fillEvent;
}
_soundBuffer.SetNotificationPositions(posNotify);
_wavePlayThread = new Thread(WavePlayThreadProc);
_wavePlayThread.IsBackground = true;
_wavePlayThread.Name = "WavePlay";
_wavePlayThread.Priority = ThreadPriority.Highest;
_wavePlayThread.Start();
}
private bool CreateSecondaryBuffer()
{
uint error = DSERR.DS_OK;
#region 创建默认音频流格式
this.wfx = new WAVEFORMATEX()
{
nChannels = this.Channel,
nSamplesPerSec = this.SamplesPerSec,
wBitsPerSample = this.BitsPerSample,
nBlockAlign = this.BlockAlign,
nAvgBytesPerSec = this.BytesPerSec,
cbSize = 0,
wFormatTag = Win32API.WAVE_FORMAT_PCM
};
this.pwfx_free = PInvoke.StructureToPtr(this.wfx);
this.dsbd = new DSBUFFERDESC()
{
dwSize = Marshal.SizeOf(typeof(DSBUFFERDESC)),
dwFlags = DSBCAPS.DSBCAPS_CTRLPOSITIONNOTIFY | DSBCAPS.DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS.DSBCAPS_GLOBALFOCUS | DSBCAPS.DSBCAPS_CTRLVOLUME,
lpwfxFormat = this.pwfx_free,
guid3DAlgorithm = new Win32API.GUID(),
dwBufferBytes = this.BufferSize * NotifyEvents,
dwReserved = 0
};
#endregion
IntPtr pdsb;
if ((error = this.ds8.CreateSoundBuffer(ref this.dsbd, out pdsb, IntPtr.Zero)) != DSERR.DS_OK)
{
logger.ErrorFormat("CreateSoundBuffer失败, DSERR = {0}", error);
return(false);
}
Guid iid_dsb8 = new Guid(InterfaceID.IID_IDirectSoundBuffer8);
Marshal.QueryInterface(pdsb, ref iid_dsb8, out this.pdsb8);
Marshal.Release(pdsb);
this.dsb8 = Marshal.GetObjectForIUnknown(this.pdsb8) as IDirectSoundBuffer8;
return(true);
}
public override bool Open(WaveFormat af)
{
this.windowHandle = GetDesktopWindow();
this.audioFormat = af;
#region 创建DirectSound对象
int dsErr = DirectSoundHelper.DirectSoundCreate8(IntPtr.Zero, out this.pds8, IntPtr.Zero);
if (dsErr != DSERR.DS_OK)
{
logger.ErrorFormat("DirectSoundCreate8失败, DSERR = {0}", dsErr);
return(false);
}
this.ds8 = Marshal.GetObjectForIUnknown(this.pds8) as IDirectSound8;
dsErr = this.ds8.SetCooperativeLevel(this.windowHandle, DSSCL.DSSCL_NORMAL);
if (dsErr != DSERR.DS_OK)
{
logger.ErrorFormat("SetCooperativeLevel失败, DSERR = {0}", dsErr);
return(false);
}
#endregion
#region 创建音频缓冲区对象
this.wfx = new WAVEFORMATEX()
{
nChannels = (short)this.audioFormat.Channel,
nSamplesPerSec = this.audioFormat.SamplesPerSec,
wBitsPerSample = (short)this.audioFormat.BitsPerSample,
nBlockAlign = (short)this.audioFormat.BlockAlign,
nAvgBytesPerSec = this.audioFormat.AvgBytesPerSec,
cbSize = 0,
wFormatTag = DirectSoundHelper.WAVE_FORMAT_PCM
};
this.pwfx_free = Utils.StructureToPtr(this.wfx);
this.dsbd = new DSBUFFERDESC()
{
dwSize = Marshal.SizeOf(typeof(DSBUFFERDESC)),
dwFlags = DSBCAPS.DSBCAPS_CTRLPOSITIONNOTIFY | DSBCAPS.DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS.DSBCAPS_GLOBALFOCUS | DSBCAPS.DSBCAPS_CTRLVOLUME,
lpwfxFormat = this.pwfx_free,
guid3DAlgorithm = new GUID(),
dwBufferBytes = audioFormat.AvgBytesPerSec,
dwReserved = 0
};
this.buffer_size = audioFormat.AvgBytesPerSec;
this.min_free_space = this.wfx.nBlockAlign;
IntPtr pdsb;
dsErr = this.ds8.CreateSoundBuffer(ref this.dsbd, out pdsb, IntPtr.Zero);
if (dsErr != DSERR.DS_OK)
{
logger.ErrorFormat("CreateSoundBuffer失败, DSERR = {0}", dsErr);
return(false);
}
Guid iid_dsb8 = new Guid(IID.IID_IDirectSoundBuffer8);
Marshal.QueryInterface(pdsb, ref iid_dsb8, out this.pdsb8);
Marshal.Release(pdsb);
this.dsb8 = Marshal.GetObjectForIUnknown(this.pdsb8) as IDirectSoundBuffer8;
#endregion
return(true);
}
