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annotate pytouhou/formats/fmt.py @ 345:2c4589370cc6

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author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 05 Jul 2012 00:11:19 +0200
parents cddfd3cb4797
children d8aab27a2ab2
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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 struct import unpack
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17
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18
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19 class Track(object):
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20 def __init__(self):
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21 self.name = ''
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22
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23 # loop info
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24 self.intro = 0
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25 #self.unknown
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26 self.start = 0
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27 self.duration = 0
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28
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29 # WAVE header
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30 self.wFormatTag = 1
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31 self.wChannels = 2
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32 self.dwSamplesPerSec = 44100
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33 self.dwAvgBytesPerSec = 176400
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34 self.wBlockAlign = 4
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35 self.wBitsPerSample = 16
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36
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37
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38 class FMT(list):
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39 @classmethod
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40 def read(cls, file):
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41 self = cls()
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42
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43 file.seek(0)
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44 while True:
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45 track = Track()
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46 track.name = unpack('<16s', file.read(16))[0]
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47 if not ord(track.name[0]):
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48 break
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49
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50 # loop info
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51 track.intro, unknown, track.start, track.duration = unpack('<IIII', file.read(16))
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52
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53 # WAVE header
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54 (track.wFormatTag,
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55 track.wChannels,
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56 track.dwSamplesPerSec,
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57 track.dwAvgBytesPerSec,
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58 track.wBlockAlign,
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59 track.wBitsPerSample) = unpack('<HHLLHH', file.read(16))
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60
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61 assert track.wFormatTag == 1 # We don’t support non-PCM formats
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62 assert track.dwAvgBytesPerSec == track.dwSamplesPerSec * track.wBlockAlign
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63 assert track.wBlockAlign == track.wChannels * track.wBitsPerSample // 8
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64 assert b'\00\00\00\00' == file.read(4)
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65
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66 self.append(track)
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67
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68 return self
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69