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annotate pytouhou/ui/music.py @ 321:61adb5453e46

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Implement music playback.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 13 Jun 2012 15:29:43 +0200
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children c412df42aa15
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61adb5453e46 Implement music playback.
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2012 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15
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16 from pyglet.media import AudioData
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17 from pyglet.media.riff import WaveSource
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18
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19
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20 class InfiniteWaveSource(WaveSource):
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21 def __init__(self, filename, start, end, file=None):
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22 WaveSource.__init__(self, filename, file)
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23
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24 self._start = self.audio_format.bytes_per_sample * start
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25 self._end = self.audio_format.bytes_per_sample * end
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26
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27 if self._end > self._max_offset:
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28 raise Exception #TODO
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29
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30 self._duration = None
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31
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32
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33 def _get_audio_data(self, bytes):
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34 if bytes % self.audio_format.bytes_per_sample != 0:
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35 bytes -= bytes % self.audio_format.bytes_per_sample
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36
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37 length = bytes
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38 while True:
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39 size = min(length, self._end - self._offset)
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40 data = self._file.read(size)
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41 if size == length:
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42 break
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43
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44 self._offset = self._start
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45 self._file.seek(self._offset + self._start_offset)
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46 length -= size
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47
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48 self._offset += length
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49
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50 timestamp = float(self._offset) / self.audio_format.bytes_per_second
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51 duration = float(bytes) / self.audio_format.bytes_per_second
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52
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53 return AudioData(data, bytes, timestamp, duration)