/usr/share/pyshared/pyglet/media/procedural.py is in python-pyglet 1.1.4.dfsg-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | # ----------------------------------------------------------------------------
# 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.
# ----------------------------------------------------------------------------
# $Id:$
from pyglet.media import Source, AudioFormat, AudioData
import ctypes
import os
import math
class ProceduralSource(Source):
def __init__(self, duration, sample_rate=44800, sample_size=16):
self._duration = float(duration)
self.audio_format = AudioFormat(
channels=1,
sample_size=sample_size,
sample_rate=sample_rate)
self._offset = 0
self._bytes_per_sample = sample_size >> 3
self._bytes_per_second = self._bytes_per_sample * sample_rate
self._max_offset = int(self._bytes_per_second * self._duration)
if self._bytes_per_sample == 2:
self._max_offset &= 0xfffffffe
def _get_audio_data(self, bytes):
bytes = min(bytes, self._max_offset - self._offset)
if bytes <= 0:
return None
timestamp = float(self._offset) / self._bytes_per_second
duration = float(bytes) / self._bytes_per_second
data = self._generate_data(bytes, self._offset)
self._offset += bytes
is_eos = self._offset >= self._max_offset
return AudioData(data,
bytes,
timestamp,
duration)
def _generate_data(self, bytes, offset):
'''Generate `bytes` bytes of data.
Return data as ctypes array or string.
'''
raise NotImplementedError('abstract')
def _seek(self, timestamp):
self._offset = int(timestamp * self._bytes_per_second)
# Bound within duration
self._offset = min(max(self._offset, 0), self._max_offset)
# Align to sample
if self._bytes_per_sample == 2:
self._offset &= 0xfffffffe
class Silence(ProceduralSource):
def _generate_data(self, bytes, offset):
if self._bytes_per_sample == 1:
return '\127' * bytes
else:
return '\0' * bytes
class WhiteNoise(ProceduralSource):
def _generate_data(self, bytes, offset):
return os.urandom(bytes)
class Sine(ProceduralSource):
def __init__(self, duration, frequency=440, **kwargs):
super(Sine, self).__init__(duration, **kwargs)
self.frequency = frequency
def _generate_data(self, bytes, offset):
if self._bytes_per_sample == 1:
start = offset
samples = bytes
bias = 127
amplitude = 127
data = (ctypes.c_ubyte * samples)()
else:
start = offset >> 1
samples = bytes >> 1
bias = 0
amplitude = 32767
data = (ctypes.c_short * samples)()
step = self.frequency * (math.pi * 2) / self.audio_format.sample_rate
for i in range(samples):
data[i] = int(math.sin(step * (i + start)) * amplitude + bias)
return data
class Saw(ProceduralSource):
def __init__(self, duration, frequency=440, **kwargs):
super(Saw, self).__init__(duration, **kwargs)
self.frequency = frequency
def _generate_data(self, bytes, offset):
# XXX TODO consider offset
if self._bytes_per_sample == 1:
samples = bytes
value = 127
max = 255
min = 0
data = (ctypes.c_ubyte * samples)()
else:
samples = bytes >> 1
value = 0
max = 32767
min = -32768
data = (ctypes.c_short * samples)()
step = (max - min) * 2 * self.frequency / self.audio_format.sample_rate
for i in range(samples):
value += step
if value > max:
value = max - (value - max)
step = -step
if value < min:
value = min - (value - min)
step = -step
data[i] = value
return data
class Square(ProceduralSource):
def __init__(self, duration, frequency=440, **kwargs):
super(Square, self).__init__(duration, **kwargs)
self.frequency = frequency
def _generate_data(self, bytes, offset):
# XXX TODO consider offset
if self._bytes_per_sample == 1:
samples = bytes
value = 0
amplitude = 255
data = (ctypes.c_ubyte * samples)()
else:
samples = bytes >> 1
value = -32768
amplitude = 65535
data = (ctypes.c_short * samples)()
period = self.audio_format.sample_rate / self.frequency / 2
count = 0
for i in range(samples):
count += 1
if count == period:
value = amplitude - value
count = 0
data[i] = value
return data
|