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comparison 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
parents
children c412df42aa15
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320:1a4ffdda8735 321:61adb5453e46
1 # -*- encoding: utf-8 -*-
2 ##
3 ## Copyright (C) 2012 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
4 ##
5 ## This program is free software; you can redistribute it and/or modify
6 ## it under the terms of the GNU General Public License as published
7 ## by the Free Software Foundation; version 3 only.
8 ##
9 ## This program is distributed in the hope that it will be useful,
10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ## GNU General Public License for more details.
13 ##
14
15
16 from pyglet.media import AudioData
17 from pyglet.media.riff import WaveSource
18
19
20 class InfiniteWaveSource(WaveSource):
21 def __init__(self, filename, start, end, file=None):
22 WaveSource.__init__(self, filename, file)
23
24 self._start = self.audio_format.bytes_per_sample * start
25 self._end = self.audio_format.bytes_per_sample * end
26
27 if self._end > self._max_offset:
28 raise Exception #TODO
29
30 self._duration = None
31
32
33 def _get_audio_data(self, bytes):
34 if bytes % self.audio_format.bytes_per_sample != 0:
35 bytes -= bytes % self.audio_format.bytes_per_sample
36
37 length = bytes
38 while True:
39 size = min(length, self._end - self._offset)
40 data = self._file.read(size)
41 if size == length:
42 break
43
44 self._offset = self._start
45 self._file.seek(self._offset + self._start_offset)
46 length -= size
47
48 self._offset += length
49
50 timestamp = float(self._offset) / self.audio_format.bytes_per_second
51 duration = float(bytes) / self.audio_format.bytes_per_second
52
53 return AudioData(data, bytes, timestamp, duration)