def __init__(self):
self._dsound = lib.IDirectSound()
lib.DirectSoundCreate(None, ctypes.byref(self._dsound), None)
# A trick used by mplayer.. use desktop as window handle since it
# would be complex to use pyglet window handles (and what to do when
# application is audio only?).
hwnd = _user32.GetDesktopWindow()
self._dsound.SetCooperativeLevel(hwnd, lib.DSSCL_NORMAL)
# Create primary buffer with 3D and volume capabilities
self._buffer = lib.IDirectSoundBuffer()
dsbd = lib.DSBUFFERDESC()
dsbd.dwSize = ctypes.sizeof(dsbd)
dsbd.dwFlags = (lib.DSBCAPS_CTRL3D | lib.DSBCAPS_CTRLVOLUME
| lib.DSBCAPS_PRIMARYBUFFER)
self._dsound.CreateSoundBuffer(dsbd, ctypes.byref(self._buffer), None)
# Create listener
self._listener = lib.IDirectSound3DListener()
self._buffer.QueryInterface(lib.IID_IDirectSound3DListener,
ctypes.byref(self._listener))
# Create worker thread
self.worker = DirectSoundWorker()
self.worker.start()
def __init__(self, source_group, player):
super(DirectSoundAudioPlayer, self).__init__(source_group, player)
# Locking strategy:
# All DirectSound calls should be locked. All instance vars relating
# to buffering/filling/time/events should be locked (used by both
# application and worker thread). Other instance vars (consts and
# 3d vars) do not need to be locked.
self._lock = threading.RLock()
# Desired play state (may be actually paused due to underrun -- not
# implemented yet).
self._playing = False
# Up to one audio data may be buffered if too much data was received
# from the source that could not be written immediately into the
# buffer. See refill().
self._next_audio_data = None
# Theoretical write and play cursors for an infinite buffer. play
# cursor is always <= write cursor (when equal, underrun is
# happening).
self._write_cursor = 0
self._play_cursor = 0
# Cursor position of end of data. Silence is written after
# eos for one buffer size.
self._eos_cursor = None
# Indexes into DSound circular buffer. Complications ensue wrt each
# other to avoid writing over the play cursor. See get_write_size and
# write().
self._play_cursor_ring = 0
self._write_cursor_ring = 0
# List of (play_cursor, MediaEvent), in sort order
self._events = []
# List of (cursor, timestamp), in sort order (cursor gives expiry
# place of the timestamp)
self._timestamps = []
audio_format = source_group.audio_format
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)
# DSound buffer
self._buffer = lib.IDirectSoundBuffer()
driver._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.SetCurrentPosition(0)
self.refill(self._buffer_size)
