[401] | 1 |
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| 2 | from util import utf2unicode
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[298] | 3 |
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| 4 | import os
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| 5 | import traceback
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[133] | 6 |
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| 7 | #------------------------------------------------------------------------------
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| 8 |
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[298] | 9 | ## @package mlx.sound
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| 10 | #
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| 11 | # Sound playback handling.
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| 12 | #
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| 13 | # This is the low level sound playback handling. The \ref initializeSound
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| 14 | # function should be called to initialize the sound handling with the directory
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[299] | 15 | # containing the sound files. Then the \ref startSound function should be
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| 16 | # called to start the playback of a certain sound file. A callback may be
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| 17 | # called when the playback of a certain file has finished.
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[298] | 18 | #
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| 19 | # See also the \ref mlx.soundsched module.
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[133] | 20 |
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| 21 | #------------------------------------------------------------------------------
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| 22 |
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| 23 | if os.name=="nt":
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| 24 | import time
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| 25 | import threading
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| 26 | from ctypes import windll, c_buffer
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| 27 |
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| 28 | class MCIException(Exception):
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| 29 | """MCI exception."""
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| 30 | def __init__(self, mci, command, errorCode):
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| 31 | """Construct an MCI exception for the given error code."""
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| 32 | message = "MCI error: %s: %s" % (command, mci.getErrorString(errorCode))
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| 33 | super(MCIException, self).__init__(message)
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| 34 |
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| 35 | class MCI:
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| 36 | """Interface for the Media Control Interface."""
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| 37 | def __init__(self):
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| 38 | """Construct the interface."""
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| 39 | self.w32mci = windll.winmm.mciSendStringA
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| 40 | self.w32mcierror = windll.winmm.mciGetErrorStringA
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| 41 |
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| 42 | def send(self, command):
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| 43 | """Send the given command to the MCI."""
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| 44 | buffer = c_buffer(255)
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| 45 | errorCode = self.w32mci(str(command), buffer, 254, 0)
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| 46 | if errorCode:
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| 47 | raise MCIException(self, command, errorCode)
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| 48 | else:
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| 49 | return buffer.value
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| 50 |
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| 51 | def getErrorString(self, errorCode):
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| 52 | """Get the string representation of the given error code."""
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| 53 | buffer = c_buffer(255)
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| 54 | self.w32mcierror(int(errorCode), buffer, 254)
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| 55 | return buffer.value
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| 56 |
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| 57 | class SoundThread(threading.Thread):
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| 58 | """The thread controlling the playback of sounds."""
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| 59 | def __init__(self, soundsDirectory):
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| 60 | threading.Thread.__init__(self)
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| 61 |
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| 62 | self._soundsDirectory = soundsDirectory
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| 63 | self._mci = MCI()
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| 64 |
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| 65 | self._requestCondition = threading.Condition()
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[170] | 66 | self._requests = []
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| 67 | self._pending = []
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[133] | 68 | self._count = 0
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| 69 |
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| 70 | self.daemon = True
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| 71 |
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[170] | 72 | def requestSound(self, name, finishCallback = None, extra = None):
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[133] | 73 | """Request the playback of the sound with the given name."""
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[176] | 74 | path = name if os.path.isabs(name) \
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| 75 | else os.path.join(self._soundsDirectory, name)
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[133] | 76 | with self._requestCondition:
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[170] | 77 | self._requests.append((path, (finishCallback, extra)))
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[133] | 78 | self._requestCondition.notify()
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| 79 |
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| 80 | def run(self):
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| 81 | """Perform the operation of the thread.
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| 82 |
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| 83 | It waits for a request or a timeout. If a request is received, that
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| 84 | is started to be played back. If a timeout occurs, the file is
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| 85 | closed."""
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| 86 |
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| 87 | while True:
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| 88 | with self._requestCondition:
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[170] | 89 | if not self._requests:
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| 90 | if self._pending:
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[180] | 91 | timeout = max(self._pending[0][0] - time.time(),
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[170] | 92 | 0.0)
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[133] | 93 | else:
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| 94 | timeout = 10.0
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[180] | 95 |
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| 96 | #print "Waiting", timeout
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[133] | 97 | self._requestCondition.wait(timeout)
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| 98 |
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[170] | 99 | requests = []
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| 100 | for (path, finishData) in self._requests:
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| 101 | requests.append((path, finishData, self._count))
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[133] | 102 | self._count += 1
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[170] | 103 | self._requests = []
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[133] | 104 |
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| 105 | now = time.time()
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[170] | 106 | toClose = []
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| 107 | while self._pending and \
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| 108 | self._pending[0][0]<=now:
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| 109 | toClose.append(self._pending[0][1])
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| 110 | del self._pending[0]
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[133] | 111 |
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[170] | 112 | for (alias, (finishCallback, extra)) in toClose:
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| 113 | success = True
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[133] | 114 | try:
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| 115 | print "Closing", alias
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| 116 | self._mci.send("close " + alias)
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| 117 | print "Closed", alias
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| 118 | except Exception, e:
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[401] | 119 | print "Failed closing " + alias + ":",
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| 120 | print utf2unicode(str(e))
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[170] | 121 | success = False
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[133] | 122 |
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[170] | 123 | if finishCallback is not None:
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| 124 | try:
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| 125 | finishCallback(success, extra)
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| 126 | except:
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| 127 | traceback.print_exc()
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| 128 |
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| 129 | for (path, finishData, counter) in requests:
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[133] | 130 | try:
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| 131 | alias = "mlxsound%d" % (counter,)
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| 132 | print "Starting to play", path, "as", alias
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| 133 | self._mci.send("open \"%s\" alias %s" % \
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| 134 | (path, alias))
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| 135 | self._mci.send("set %s time format milliseconds" % \
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| 136 | (alias,))
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| 137 | lengthBuffer = self._mci.send("status %s length" % \
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| 138 | (alias,))
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| 139 | self._mci.send("play %s from 0 to %s" % \
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| 140 | (alias, lengthBuffer))
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| 141 | length = int(lengthBuffer)
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| 142 | timeout = time.time() + length / 1000.0
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| 143 | with self._requestCondition:
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[170] | 144 | self._pending.append((timeout, (alias, finishData)))
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| 145 | self._pending.sort()
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[133] | 146 | print "Started to play", path
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| 147 | except Exception, e:
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[401] | 148 | print "Failed to start playing " + path + ":",
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| 149 | print utf2unicode(str(e))
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[170] | 150 | (finishCallback, extra) = finishData
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| 151 | if finishCallback is not None:
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| 152 | try:
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| 153 | finishCallback(None, extra)
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| 154 | except:
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| 155 | traceback.print_exc()
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[133] | 156 |
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| 157 | _thread = None
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| 158 |
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[800] | 159 | def preInitializeSound():
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| 160 | """Perform any-pre initialization.
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| 161 |
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| 162 | This does nothing on Windows."""
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| 163 |
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[133] | 164 | def initializeSound(soundsDirectory):
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| 165 | """Initialize the sound handling with the given directory containing
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| 166 | the sound files."""
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| 167 | global _thread
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| 168 | _thread = SoundThread(soundsDirectory)
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| 169 | _thread.start()
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| 170 |
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[170] | 171 | def startSound(name, finishCallback = None, extra = None):
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[133] | 172 | """Start playing back the given sound.
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[422] | 173 |
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[133] | 174 | name should be the name of a sound file relative to the sound directory
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| 175 | given in initializeSound."""
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[170] | 176 | _thread.requestSound(name, finishCallback = finishCallback,
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| 177 | extra = extra)
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[422] | 178 |
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[573] | 179 | def finalizeSound():
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| 180 | """Finalize the sound handling."""
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| 181 | pass
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| 182 |
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[133] | 183 | #------------------------------------------------------------------------------
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| 184 |
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| 185 | else: # os.name!="nt"
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[800] | 186 | from multiprocessing import Process, Queue
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| 187 | from threading import Thread, Lock
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| 188 |
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| 189 | COMMAND_STARTSOUND = 1
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| 190 | COMMAND_QUIT = 2
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| 191 |
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| 192 | REPLY_FINISHED = 101
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| 193 | REPLY_FAILED = 102
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| 194 | REPLY_QUIT = 103
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| 195 |
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| 196 | _initialized = False
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| 197 | _process = None
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| 198 | _thread = None
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| 199 | _inQueue = None
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| 200 | _outQueue = None
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| 201 | _nextReference = 1
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| 202 | _ref2Data = {}
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| 203 | _lock = Lock()
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| 204 |
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| 205 | def _processFn(inQueue, outQueue):
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| 206 | """The function running in the helper process created.
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[422] | 207 |
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[800] | 208 | It tries to load the Gst module. If successful, True is sent back,
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| 209 | otherwise False followed by the exception caught and the function
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| 210 | quits.
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| 211 |
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| 212 | In case of successful initialization, the directory of the sound files
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| 213 | is read, the command reader thread is created and the gobject main loop
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| 214 | is executed."""
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| 215 | try:
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| 216 | import gi.repository
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| 217 | gi.require_version("Gst", "1.0")
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| 218 | from gi.repository import Gst
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| 219 | from gi.repository import GObject as gobject
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| 220 |
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| 221 | Gst.init(None)
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| 222 | except Exception, e:
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| 223 | outQueue.put(False)
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| 224 | outQueue.put(e)
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| 225 | return
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| 226 |
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| 227 | outQueue.put(True)
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| 228 |
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| 229 | soundsDirectory = inQueue.get()
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| 230 |
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[576] | 231 | _bins = set()
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[422] | 232 |
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[800] | 233 | mainLoop = None
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| 234 |
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| 235 | def _handlePlayBinMessage(bus, message, bin, reference):
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| 236 | """Handle messages related to a playback."""
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| 237 | if bin in _bins:
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| 238 | if message.type==Gst.MessageType.EOS:
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| 239 | _bins.remove(bin)
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| 240 | if reference is not None:
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| 241 | outQueue.put((REPLY_FINISHED, (reference,)))
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| 242 | elif message.type==Gst.MessageType.ERROR:
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| 243 | _bins.remove(bin)
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| 244 | if reference is not None:
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| 245 | outQueue.put((REPLY_FAILED, (reference,)))
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[422] | 246 |
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[800] | 247 | def _handleCommand(command, args):
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| 248 | """Handle commands sent to the server."""
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| 249 | if command==COMMAND_STARTSOUND:
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| 250 | (name, reference) = args
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| 251 | try:
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| 252 | playBin = Gst.ElementFactory.make("playbin", "player")
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| 253 |
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| 254 | bus = playBin.get_bus()
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| 255 | bus.add_signal_watch()
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| 256 | bus.connect("message", _handlePlayBinMessage,
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| 257 | playBin, reference)
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| 258 |
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| 259 | path = os.path.join(soundsDirectory, name)
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| 260 | playBin.set_property( "uri", "file://%s" % (path,))
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[576] | 261 |
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[800] | 262 | playBin.set_state(Gst.State.PLAYING)
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| 263 | _bins.add(playBin)
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| 264 | except Exception as e:
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| 265 | if reference is not None:
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| 266 | outQueue.put((REPLY_FAILED, (reference,)))
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| 267 | elif command==COMMAND_QUIT:
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| 268 | outQueue.put((REPLY_QUIT, None))
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| 269 | mainLoop.quit()
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| 270 |
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| 271 | def _processCommands():
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| 272 | """Process incoming commands.
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| 273 |
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| 274 | It is to be executed in a separate thread and it reads the incoming
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| 275 | queue for commands. The commands with their arguments are added to the
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| 276 | idle queue of gobject so that _handleCommand will be called by them.
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| 277 |
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| 278 | If COMMAND_QUIT is received, the thread exits."""
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[576] | 279 |
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[800] | 280 | while True:
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| 281 | (command, args) = inQueue.get()
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| 282 |
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| 283 | gobject.idle_add(_handleCommand, command, args)
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| 284 | if command==COMMAND_QUIT:
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| 285 | break
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[576] | 286 |
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[800] | 287 | commandThread = Thread(target = _processCommands)
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| 288 | commandThread.daemon = True
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| 289 | commandThread.start()
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| 290 |
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| 291 |
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| 292 | mainLoop = gobject.MainLoop()
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| 293 | mainLoop.run()
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| 294 |
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| 295 | commandThread.join()
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| 296 |
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| 297 | def _handleInQueue():
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| 298 | """Handle the incoming queue in the main program.
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[422] | 299 |
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[800] | 300 | It reads the replies sent by the helper process. In case of
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| 301 | REPLY_FINISHED and REPLY_FAILED the appropriate callback is called. In
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| 302 | case of REPLY_QUIT, the thread quits as well."""
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| 303 | while True:
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| 304 | (reply, args) = _inQueue.get()
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| 305 | if reply==REPLY_FINISHED or reply==REPLY_FAILED:
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| 306 | (reference,) = args
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| 307 | callback = None
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| 308 | extra = None
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| 309 | with _lock:
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| 310 | (callback, extra) = _ref2Data.get(reference, (None, None))
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| 311 | if callback is not None:
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| 312 | del _ref2Data[reference]
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| 313 | if callback is not None:
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| 314 | callback(reply==REPLY_FINISHED, extra)
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| 315 | elif reply==REPLY_QUIT:
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| 316 | break
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[576] | 317 |
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[800] | 318 | def preInitializeSound():
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| 319 | """Start the sound handling process and create the thread handling the
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| 320 | incoming queue."""
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| 321 | global _thread
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| 322 | global _process
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| 323 | global _inQueue
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| 324 | global _outQueue
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[576] | 325 |
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[800] | 326 | _inQueue = Queue()
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| 327 | _outQueue = Queue()
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| 328 |
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| 329 | _process = Process(target = _processFn, args = (_outQueue, _inQueue))
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| 330 | _process.start()
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| 331 |
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| 332 | _thread = Thread(target = _handleInQueue)
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| 333 | _thread.daemon = True
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| 334 |
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| 335 | def initializeSound(soundsDirectory):
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| 336 | """Initialize the sound handling. It reads a boolean from the incoming
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| 337 | queue indicating if the libraries could be loaded by the process.
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[573] | 338 |
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[800] | 339 | If the boolean is True, the thread handling the incoming replies is
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| 340 | started and the directory containing the sounds file is written to the
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| 341 | output queue.
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| 342 |
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| 343 | Otherwise the exception is read from the queue, and printed with an
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| 344 | error message."""
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| 345 | global _initialized
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| 346 | _initialized = _inQueue.get()
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| 347 |
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| 348 | if _initialized:
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| 349 | _thread.start()
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| 350 | _outQueue.put(soundsDirectory)
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| 351 | else:
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| 352 | exception = _inQueue.get()
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| 353 | print "The Gst library is missing from your system. It is needed for sound playback on Linux:"
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| 354 | print exception
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| 355 |
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| 356 | def startSound(name, finishCallback = None, extra = None):
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| 357 | """Start playing back the given sound.
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[422] | 358 |
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[800] | 359 | If a callback is given, a new reference is acquired and the callback is
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| 360 | registered with it. Then a COMMAND_STARTSOUND command is written to the
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| 361 | output queue"""
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| 362 | if _initialized:
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| 363 | reference = None
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| 364 | if finishCallback is not None:
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| 365 | with _lock:
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| 366 | global _nextReference
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| 367 | reference = _nextReference
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| 368 | _nextReference += 1
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| 369 | _ref2Data[reference] = (finishCallback, extra)
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[422] | 370 |
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[800] | 371 | _outQueue.put((COMMAND_STARTSOUND, (name, reference)))
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| 372 |
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| 373 | def finalizeSound():
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| 374 | """Finalize the sound handling.
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[133] | 375 |
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[800] | 376 | COMMAND_QUIT is sent to the helper process, and then it is joined."""
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| 377 | if _initialized:
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| 378 | _outQueue.put((COMMAND_QUIT, None))
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| 379 | _process.join()
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| 380 | _thread.join()
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[573] | 381 |
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[133] | 382 | #------------------------------------------------------------------------------
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| 383 | #------------------------------------------------------------------------------
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| 384 |
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| 385 | if __name__ == "__main__":
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[800] | 386 | import time
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| 387 |
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[170] | 388 | def callback(result, extra):
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| 389 | print "callback", result, extra
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[422] | 390 |
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[800] | 391 | preInitializeSound()
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| 392 |
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| 393 | soundsPath = os.path.abspath(os.path.join(os.path.dirname(os.path.abspath(__file__)),
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| 394 | "..", "..", "sounds"))
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| 395 | print "soundsPath:", soundsPath
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| 396 | initializeSound(soundsPath)
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| 397 | startSound("notam.mp3", finishCallback = callback, extra= "notam.mp3")
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| 398 | time.sleep(5)
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[170] | 399 | startSound("malev.mp3", finishCallback = callback, extra="malev.mp3")
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[133] | 400 | time.sleep(5)
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[170] | 401 | startSound("ding.wav", finishCallback = callback, extra="ding1.wav")
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[133] | 402 | time.sleep(5)
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[170] | 403 | startSound("ding.wav", finishCallback = callback, extra="ding2.wav")
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[133] | 404 | time.sleep(5)
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[170] | 405 | startSound("ding.wav", finishCallback = callback, extra="ding3.wav")
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[800] | 406 | time.sleep(5)
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| 407 | startSound("dong.wav", finishCallback = callback, extra="dong3.wav")
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[133] | 408 | time.sleep(50)
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| 409 |
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[800] | 410 | finalizeSound()
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| 411 |
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[133] | 412 | #------------------------------------------------------------------------------
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