| 1 | # Module to handle sound playback
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| 2 |
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| 3 | #------------------------------------------------------------------------------
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| 4 |
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| 5 | import os
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| 6 | import traceback
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| 7 |
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| 8 | #------------------------------------------------------------------------------
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| 9 |
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| 10 | if os.name=="nt":
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| 11 | import time
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| 12 | import threading
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| 13 | from ctypes import windll, c_buffer
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| 14 |
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| 15 | class MCIException(Exception):
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| 16 | """MCI exception."""
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| 17 | def __init__(self, mci, command, errorCode):
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| 18 | """Construct an MCI exception for the given error code."""
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| 19 | message = "MCI error: %s: %s" % (command, mci.getErrorString(errorCode))
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| 20 | super(MCIException, self).__init__(message)
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| 21 |
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| 22 | class MCI:
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| 23 | """Interface for the Media Control Interface."""
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| 24 | def __init__(self):
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| 25 | """Construct the interface."""
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| 26 | self.w32mci = windll.winmm.mciSendStringA
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| 27 | self.w32mcierror = windll.winmm.mciGetErrorStringA
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| 28 |
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| 29 | def send(self, command):
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| 30 | """Send the given command to the MCI."""
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| 31 | buffer = c_buffer(255)
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| 32 | errorCode = self.w32mci(str(command), buffer, 254, 0)
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| 33 | if errorCode:
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| 34 | raise MCIException(self, command, errorCode)
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| 35 | else:
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| 36 | return buffer.value
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| 37 |
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| 38 | def getErrorString(self, errorCode):
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| 39 | """Get the string representation of the given error code."""
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| 40 | buffer = c_buffer(255)
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| 41 | self.w32mcierror(int(errorCode), buffer, 254)
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| 42 | return buffer.value
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| 43 |
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| 44 | class SoundThread(threading.Thread):
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| 45 | """The thread controlling the playback of sounds."""
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| 46 | def __init__(self, soundsDirectory):
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| 47 | threading.Thread.__init__(self)
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| 48 |
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| 49 | self._soundsDirectory = soundsDirectory
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| 50 | self._mci = MCI()
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| 51 |
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| 52 | self._requestCondition = threading.Condition()
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| 53 | self._requests = []
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| 54 | self._pending = []
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| 55 | self._count = 0
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| 56 |
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| 57 | self.daemon = True
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| 58 |
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| 59 | def requestSound(self, name, finishCallback = None, extra = None):
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| 60 | """Request the playback of the sound with the given name."""
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| 61 | path = name if os.path.isabs(name) \
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| 62 | else os.path.join(self._soundsDirectory, name)
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| 63 | with self._requestCondition:
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| 64 | self._requests.append((path, (finishCallback, extra)))
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| 65 | self._requestCondition.notify()
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| 66 |
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| 67 | def run(self):
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| 68 | """Perform the operation of the thread.
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| 69 |
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| 70 | It waits for a request or a timeout. If a request is received, that
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| 71 | is started to be played back. If a timeout occurs, the file is
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| 72 | closed."""
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| 73 |
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| 74 | while True:
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| 75 | with self._requestCondition:
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| 76 | if not self._requests:
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| 77 | if self._pending:
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| 78 | timeout = max(time.time() - self._pending[0][0],
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| 79 | 0.0)
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| 80 | else:
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| 81 | timeout = 10.0
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| 82 |
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| 83 | self._requestCondition.wait(timeout)
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| 84 |
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| 85 | requests = []
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| 86 | for (path, finishData) in self._requests:
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| 87 | requests.append((path, finishData, self._count))
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| 88 | self._count += 1
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| 89 | self._requests = []
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| 90 |
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| 91 | now = time.time()
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| 92 | toClose = []
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| 93 | while self._pending and \
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| 94 | self._pending[0][0]<=now:
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| 95 | toClose.append(self._pending[0][1])
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| 96 | del self._pending[0]
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| 97 |
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| 98 | for (alias, (finishCallback, extra)) in toClose:
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| 99 | success = True
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| 100 | try:
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| 101 | print "Closing", alias
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| 102 | self._mci.send("close " + alias)
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| 103 | print "Closed", alias
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| 104 | except Exception, e:
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| 105 | print "Failed closing " + alias + ":", str(e)
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| 106 | success = False
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| 107 |
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| 108 | if finishCallback is not None:
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| 109 | try:
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| 110 | finishCallback(success, extra)
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| 111 | except:
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| 112 | traceback.print_exc()
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| 113 |
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| 114 | for (path, finishData, counter) in requests:
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| 115 | try:
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| 116 | alias = "mlxsound%d" % (counter,)
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| 117 | print "Starting to play", path, "as", alias
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| 118 | self._mci.send("open \"%s\" alias %s" % \
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| 119 | (path, alias))
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| 120 | self._mci.send("set %s time format milliseconds" % \
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| 121 | (alias,))
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| 122 | lengthBuffer = self._mci.send("status %s length" % \
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| 123 | (alias,))
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| 124 | self._mci.send("play %s from 0 to %s" % \
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| 125 | (alias, lengthBuffer))
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| 126 | length = int(lengthBuffer)
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| 127 | timeout = time.time() + length / 1000.0
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| 128 | with self._requestCondition:
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| 129 | self._pending.append((timeout, (alias, finishData)))
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| 130 | self._pending.sort()
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| 131 | print "Started to play", path
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| 132 | except Exception, e:
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| 133 | print "Failed to start playing " + path + ":", str(e)
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| 134 | (finishCallback, extra) = finishData
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| 135 | if finishCallback is not None:
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| 136 | try:
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| 137 | finishCallback(None, extra)
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| 138 | except:
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| 139 | traceback.print_exc()
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| 140 |
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| 141 | _thread = None
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| 142 |
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| 143 | def initializeSound(soundsDirectory):
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| 144 | """Initialize the sound handling with the given directory containing
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| 145 | the sound files."""
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| 146 | global _thread
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| 147 | _thread = SoundThread(soundsDirectory)
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| 148 | _thread.start()
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| 149 |
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| 150 | def startSound(name, finishCallback = None, extra = None):
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| 151 | """Start playing back the given sound.
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| 152 |
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| 153 | name should be the name of a sound file relative to the sound directory
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| 154 | given in initializeSound."""
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| 155 | _thread.requestSound(name, finishCallback = finishCallback,
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| 156 | extra = extra)
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| 157 |
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| 158 | #------------------------------------------------------------------------------
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| 159 |
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| 160 | else: # os.name!="nt"
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| 161 | def initializeSound(soundsDirectory):
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| 162 | """Initialize the sound handling with the given directory containing
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| 163 | the sound files."""
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| 164 | pass
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| 165 |
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| 166 | def startSound(name, finishCallback = None, extra = None):
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| 167 | """Start playing back the given sound.
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| 168 |
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| 169 | FIXME: it does not do anything currently, but it should."""
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| 170 | print "sound.startSound:", name
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| 171 |
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| 172 | #------------------------------------------------------------------------------
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| 173 | #------------------------------------------------------------------------------
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| 174 |
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| 175 | if __name__ == "__main__":
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| 176 | def callback(result, extra):
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| 177 | print "callback", result, extra
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| 178 |
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| 179 | initializeSound("e:\\home\\vi\\tmp")
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| 180 | startSound("malev.mp3", finishCallback = callback, extra="malev.mp3")
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| 181 | time.sleep(5)
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| 182 | startSound("ding.wav", finishCallback = callback, extra="ding1.wav")
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| 183 | time.sleep(5)
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| 184 | startSound("ding.wav", finishCallback = callback, extra="ding2.wav")
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| 185 | time.sleep(5)
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| 186 | startSound("ding.wav", finishCallback = callback, extra="ding3.wav")
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| 187 | time.sleep(50)
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| 188 |
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| 189 | #------------------------------------------------------------------------------
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