/usr/lib/python2.7/dist-packages/pyglet/media/drivers/alsa/__init__.py is in python-pyglet 1.1.4.dfsg-3.
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# pyglet
# Copyright (c) 2006-2008 Alex Holkner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of pyglet nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ----------------------------------------------------------------------------
'''Linux ALSA audio implementation.
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id: __init__.py 2084 2008-05-27 12:42:19Z Alex.Holkner $'
import ctypes
import pyglet
from pyglet.media import AudioPlayer, Listener, MediaException
from pyglet.media.drivers.alsa import asound
alsa_debug = None
if pyglet.options['debug_media']:
alsa_debug = 'alsa.log'
class ALSAException(MediaException):
pass
if alsa_debug:
def check(err):
if err < 0:
raise ALSAException(asound.snd_strerror(err))
return err
else:
check = lambda v: v
class ALSAAudioPlayer(AudioPlayer):
_device_name = 'default'
_buffer_time = 0.3
_min_write_bytes = 10000
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 __del__(self):
try:
check(asound.snd_pcm_close(self.pcm))
except:
pass
def get_write_size(self):
state = asound.snd_pcm_state(self.pcm)
if state == asound.SND_PCM_STATE_PAUSED:
return 0
avail = max(0, asound.snd_pcm_avail_update(self.pcm))
bytes = avail * self.audio_format.bytes_per_sample
if bytes < self._min_write_bytes:
return 0
return bytes
def write(self, audio_data):
samples = audio_data.length // self.audio_format.bytes_per_sample
samples_out = asound.snd_pcm_writei(self.pcm, audio_data.data,
samples)
if samples_out < 0:
if samples_out == -11: # EAGAIN
return
elif samples_out == -32: # EPIPE (xrun)
check(asound.snd_pcm_prepare(self.pcm))
return
else:
raise ALSAException(asound.snd_strerror(samples_out))
delay = asound.snd_pcm_sframes_t()
check(asound.snd_pcm_delay(self.pcm, delay))
alsatime = self._get_asound_time() + \
delay.value / float(self.audio_format.sample_rate)
self._timestamps.append((alsatime, audio_data.timestamp))
audio_data.consume(samples_out * self.audio_format.bytes_per_sample,
self.audio_format)
def write_eos(self):
if self._timestamps:
self._timestamps.append((None, None))
def write_end(self):
pass
def play(self):
if self._playing:
return
state = asound.snd_pcm_state(self.pcm)
if self.can_pause and state == asound.SND_PCM_STATE_PAUSED:
check(asound.snd_pcm_pause(self.pcm, 0))
elif state not in (asound.SND_PCM_STATE_RUNNING,
asound.SND_PCM_STATE_PREPARED):
check(asound.snd_pcm_prepare(self.pcm))
self._playing = True
if self._stop_alsatime is not None:
diff = self._get_asound_time() - self._stop_alsatime
self._timestamps = [(a + diff, t) for a, t in self._timestamps]
self._stop_alsatime = None
def stop(self):
if not self._playing:
return
if self.can_pause and self._playing:
check(asound.snd_pcm_pause(self.pcm, 1))
self._stop_alsatime = self._get_asound_time()
else:
# Hardware can't pause, so we'll just drop everything that's
# been buffered. Improvement could be to rebuffer data that
# wasn't played.
self.clear()
self._playing = False
def clear(self):
check(asound.snd_pcm_drop(self.pcm))
self._stop_alsatime = None
self._timestamps = []
def _get_asound_time(self):
status = ctypes.POINTER(asound.snd_pcm_status_t)()
timestamp = asound.snd_timestamp_t()
check(asound.snd_pcm_status_malloc(ctypes.byref(status)))
check(asound.snd_pcm_status(self.pcm, status))
asound.snd_pcm_status_get_tstamp(status, ctypes.byref(timestamp))
asound.snd_pcm_status_free(status)
return timestamp.tv_sec + timestamp.tv_usec * 0.000001
def pump(self):
underrun = False
if self._stop_alsatime is not None:
return underrun
# Check that ALSA's still playing
if self._playing:
state = asound.snd_pcm_state(self.pcm)
if state not in (asound.SND_PCM_STATE_RUNNING,
asound.SND_PCM_STATE_PREPARED):
# Underrun!
check(asound.snd_pcm_prepare(self.pcm))
underrun = True
alsatime = self._get_asound_time()
try:
while self._timestamps[0][0] < alsatime:
self._timestamps.pop(0)
while self._timestamps[0][0] is None:
self._eos_count += 1
self._timestamps.pop(0)
except IndexError:
pass
return underrun
def get_time(self):
if self._stop_alsatime is None:
alsatime = self._get_asound_time()
else:
alsatime = self._stop_alsatime
if not self._timestamps:
self._playing = False
return 0.0
alsats, ts = self._timestamps[0]
t = alsatime - alsats + ts
return t
def clear_eos(self):
if self._eos_count > 0:
self._eos_count -= 1
return True
return False
class ALSAListener(Listener):
def _set_volume(self, volume):
# TODO master volume
self._volume = volume
# All other properties are silently ignored.
def _set_position(self, position):
self._position = position
def _set_velocity(self, velocity):
self._velocity = velocity
def _set_forward_orientation(self, orientation):
self._forward_orientation = orientation
def _set_up_orientation(self, orientation):
self._up_orientation = orientation
def _set_doppler_factor(self, factor):
self._doppler_factor = factor
def _set_speed_of_sound(self, speed_of_sound):
self._speed_of_sound = speed_of_sound
def driver_init():
global debug_output
debug_output = ctypes.POINTER(asound.snd_output_t)()
if alsa_debug:
check(asound.snd_output_stdio_open(ctypes.byref(debug_output),
alsa_debug,
'w'))
driver_listener = ALSAListener()
driver_audio_player_class = ALSAAudioPlayer
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