def prepare(self, source):
if not source.audio_format:
# TODO avoid creating in this case.
return
format = {
8: asound.SND_PCM_FORMAT_U8,
16: asound.SND_PCM_FORMAT_S16,
24: asound.SND_PCM_FORMAT_S24, # probably won't work
32: asound.SND_PCM_FORMAT_S32
}.get(source.audio_format.sample_size)
if format is None:
raise ALSAException('Unsupported audio format.')
check(asound.snd_pcm_hw_params_set_access(self.pcm, self.hwparams,
asound.SND_PCM_ACCESS_RW_INTERLEAVED))
check(asound.snd_pcm_hw_params_set_format(self.pcm, self.hwparams,
format))
check(asound.snd_pcm_hw_params_set_channels(self.pcm, self.hwparams,
source.audio_format.channels))
check(asound.snd_pcm_hw_params_set_rate(self.pcm, self.hwparams,
source.audio_format.sample_rate, 0))
check(asound.snd_pcm_hw_params_set_buffer_size(self.pcm, self.hwparams,
int(self._ring_buffer_time * source.audio_format.sample_rate)))
check(asound.snd_pcm_hw_params(self.pcm, self.hwparams))
if alsa_debug:
check(asound.snd_pcm_dump(self.pcm, debug_output))
self.can_pause = asound.snd_pcm_hw_params_can_pause(self.hwparams)
def __init__(self, audio_format):
super(ALSAAudioPlayer, self).__init__(audio_format)
format = {
8: asound.SND_PCM_FORMAT_U8,
16: asound.SND_PCM_FORMAT_S16,
24: asound.SND_PCM_FORMAT_S24, # probably won't work
32: asound.SND_PCM_FORMAT_S32
}.get(audio_format.sample_size)
if format is None:
raise ALSAException('Unsupported audio format.')
self.pcm = ctypes.POINTER(asound.snd_pcm_t)()
self.hwparams = ctypes.POINTER(asound.snd_pcm_hw_params_t)()
self.swparams = ctypes.POINTER(asound.snd_pcm_sw_params_t)()
check(asound.snd_pcm_open(ctypes.byref(self.pcm),
self._device_name,
asound.SND_PCM_STREAM_PLAYBACK,
asound.SND_PCM_NONBLOCK))
check(asound.snd_pcm_hw_params_malloc(ctypes.byref(self.hwparams)))
check(asound.snd_pcm_sw_params_malloc(ctypes.byref(self.swparams)))
check(asound.snd_pcm_hw_params_any(self.pcm, self.hwparams))
check(asound.snd_pcm_hw_params_set_access(self.pcm, self.hwparams,
asound.SND_PCM_ACCESS_RW_INTERLEAVED))
check(asound.snd_pcm_hw_params_set_format(self.pcm, self.hwparams,
format))
check(asound.snd_pcm_hw_params_set_channels(self.pcm, self.hwparams,
audio_format.channels))
rate = ctypes.c_uint(audio_format.sample_rate)
dir = ctypes.c_int(0)
check(asound.snd_pcm_hw_params_set_rate_near(self.pcm, self.hwparams,
rate, dir))
# Note actual sample rate is in rate.value. Ignored for now because
# difference is negligible.
buffer_size = int(self._buffer_time * audio_format.sample_rate)
bs = asound.snd_pcm_uframes_t(buffer_size)
check(asound.snd_pcm_hw_params_set_buffer_size_near(self.pcm,
self.hwparams, bs))
# Actual buffer size is in bs.value. Ignored for now.
check(asound.snd_pcm_hw_params(self.pcm, self.hwparams))
if alsa_debug:
asound.snd_output_printf(debug_output,
'New device: %s\n' % self._device_name)
check(asound.snd_pcm_dump(self.pcm, debug_output))
self.can_pause = asound.snd_pcm_hw_params_can_pause(self.hwparams)
# List of (alsatime, timestamp)
self._timestamps = []
self._stop_alsatime = None
self._eos_count = 0
self._playing = False
def __init__(self, audio_format):
super(ALSAAudioPlayer, self).__init__(audio_format)
format = {
8: asound.SND_PCM_FORMAT_U8,
16: asound.SND_PCM_FORMAT_S16,
24: asound.SND_PCM_FORMAT_S24, # probably won't work
32: asound.SND_PCM_FORMAT_S32
}.get(audio_format.sample_size)
if format is None:
raise ALSAException('Unsupported audio format.')
self.pcm = ctypes.POINTER(asound.snd_pcm_t)()
self.hwparams = ctypes.POINTER(asound.snd_pcm_hw_params_t)()
self.swparams = ctypes.POINTER(asound.snd_pcm_sw_params_t)()
check(asound.snd_pcm_open(ctypes.byref(self.pcm),
self._device_name,
asound.SND_PCM_STREAM_PLAYBACK,
asound.SND_PCM_NONBLOCK))
check(asound.snd_pcm_hw_params_malloc(ctypes.byref(self.hwparams)))
check(asound.snd_pcm_sw_params_malloc(ctypes.byref(self.swparams)))
check(asound.snd_pcm_hw_params_any(self.pcm, self.hwparams))
check(asound.snd_pcm_hw_params_set_access(self.pcm, self.hwparams,
asound.SND_PCM_ACCESS_RW_INTERLEAVED))
check(asound.snd_pcm_hw_params_set_format(self.pcm, self.hwparams,
format))
check(asound.snd_pcm_hw_params_set_channels(self.pcm, self.hwparams,
audio_format.channels))
rate = ctypes.c_uint(audio_format.sample_rate)
dir = ctypes.c_int(0)
check(asound.snd_pcm_hw_params_set_rate_near(self.pcm, self.hwparams,
rate, dir))
# Note actual sample rate is in rate.value. Ignored for now because
# difference is negligible.
buffer_size = int(self._buffer_time * audio_format.sample_rate)
bs = asound.snd_pcm_uframes_t(buffer_size)
check(asound.snd_pcm_hw_params_set_buffer_size_near(self.pcm,
self.hwparams, bs))
# Actual buffer size is in bs.value. Ignored for now.
check(asound.snd_pcm_hw_params(self.pcm, self.hwparams))
if alsa_debug:
asound.snd_output_printf(debug_output,
'New device: %s\n' % self._device_name)
check(asound.snd_pcm_dump(self.pcm, debug_output))
self.can_pause = asound.snd_pcm_hw_params_can_pause(self.hwparams)
# List of (alsatime, timestamp)
self._timestamps = []
self._stop_alsatime = None
self._eos_count = 0
self._playing = False
