def _init(self):
# Called after driver_init()
self._buffer = lib.IDirectSoundBuffer()
dsbd = lib.DSBUFFERDESC()
dsbd.dwSize = ctypes.sizeof(dsbd)
dsbd.dwFlags = (lib.DSBCAPS_CTRL3D | lib.DSBCAPS_CTRLVOLUME
| lib.DSBCAPS_PRIMARYBUFFER)
dsound.CreateSoundBuffer(dsbd, ctypes.byref(self._buffer), None)
self._listener = lib.IDirectSound3DListener()
self._buffer.QueryInterface(lib.IID_IDirectSound3DListener,
ctypes.byref(self._listener))
def __init__(self, audio_format):
super(DirectSoundAudioPlayer, self).__init__(audio_format)
self._playing = False
self._timestamp = 0.
self._buffer = None
self._buffer_playing = False
self._data_size = 0 # amount of buffer filled by this player
self._play_cursor = 0
self._buffer_time = 0. # ts of buffer at buffer_time_pos
self._buffer_time_pos = 0
self._write_cursor = 0
self._timestamps = []
self._eos_count = 0
self._dirty_size = 0
wfx = lib.WAVEFORMATEX()
wfx.wFormatTag = lib.WAVE_FORMAT_PCM
wfx.nChannels = audio_format.channels
wfx.nSamplesPerSec = audio_format.sample_rate
wfx.wBitsPerSample = audio_format.sample_size
wfx.nBlockAlign = wfx.wBitsPerSample * wfx.nChannels // 8
wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign
dsbdesc = lib.DSBUFFERDESC()
dsbdesc.dwSize = ctypes.sizeof(dsbdesc)
dsbdesc.dwFlags = (lib.DSBCAPS_GLOBALFOCUS |
lib.DSBCAPS_GETCURRENTPOSITION2 |
lib.DSBCAPS_CTRLFREQUENCY |
lib.DSBCAPS_CTRLVOLUME)
if audio_format.channels == 1:
dsbdesc.dwFlags |= lib.DSBCAPS_CTRL3D
dsbdesc.dwBufferBytes = self._buffer_size
dsbdesc.lpwfxFormat = ctypes.pointer(wfx)
self._buffer = lib.IDirectSoundBuffer()
dsound.CreateSoundBuffer(dsbdesc, ctypes.byref(self._buffer), None)
if audio_format.channels == 1:
self._buffer3d = lib.IDirectSound3DBuffer()
self._buffer.QueryInterface(lib.IID_IDirectSound3DBuffer,
ctypes.byref(self._buffer3d))
else:
self._buffer3d = None
self._buffer_size_secs = \
self._buffer_size / float(audio_format.bytes_per_second)
self._buffer.SetCurrentPosition(0)