1 |
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2 | from util import utf2unicode
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3 |
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4 | import os
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5 | import traceback
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6 |
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7 | #------------------------------------------------------------------------------
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8 |
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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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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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18 | #
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19 | # See also the \ref mlx.soundsched module.
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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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66 | self._requests = []
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67 | self._pending = []
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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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72 | def requestSound(self, name, finishCallback = None, extra = None):
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73 | """Request the playback of the sound with the given name."""
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74 | path = name if os.path.isabs(name) \
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75 | else os.path.join(self._soundsDirectory, name)
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76 | with self._requestCondition:
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77 | self._requests.append((path, (finishCallback, extra)))
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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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89 | if not self._requests:
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90 | if self._pending:
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91 | timeout = max(self._pending[0][0] - time.time(),
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92 | 0.0)
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93 | else:
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94 | timeout = 10.0
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95 |
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96 | #print "Waiting", timeout
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97 | self._requestCondition.wait(timeout)
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98 |
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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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102 | self._count += 1
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103 | self._requests = []
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104 |
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105 | now = time.time()
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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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111 |
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112 | for (alias, (finishCallback, extra)) in toClose:
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113 | success = True
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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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119 | print "Failed closing " + alias + ":",
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120 | print utf2unicode(str(e))
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121 | success = False
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122 |
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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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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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144 | self._pending.append((timeout, (alias, finishData)))
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145 | self._pending.sort()
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146 | print "Started to play", path
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147 | except Exception, e:
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148 | print "Failed to start playing " + path + ":",
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149 | print utf2unicode(str(e))
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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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156 |
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157 | _thread = None
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158 |
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159 | def initializeSound(soundsDirectory):
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160 | """Initialize the sound handling with the given directory containing
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161 | the sound files."""
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162 | global _thread
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163 | _thread = SoundThread(soundsDirectory)
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164 | _thread.start()
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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 | name should be the name of a sound file relative to the sound directory
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170 | given in initializeSound."""
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171 | _thread.requestSound(name, finishCallback = finishCallback,
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172 | extra = extra)
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173 |
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174 | def finalizeSound():
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175 | """Finalize the sound handling."""
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176 | pass
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177 |
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178 | #------------------------------------------------------------------------------
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179 |
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180 | else: # os.name!="nt"
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181 | import threading
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182 | import time
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183 | try:
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184 | from common import gst_init, gobject, gst_element_factory_make
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185 | from common import GST_STATE_PLAYING, GST_MESSAGE_EOS
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186 |
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187 | _soundsDirectory = None
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188 | _bins = set()
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189 |
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190 | def initializeSound(soundsDirectory):
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191 | """Initialize the sound handling with the given directory containing
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192 | the sound files."""
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193 | gst_init()
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194 | global _soundsDirectory
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195 | _soundsDirectory = soundsDirectory
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196 |
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197 | def startSound(name, finishCallback = None, extra = None):
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198 | """Start playing back the given sound."""
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199 | try:
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200 | playBin = gst_element_factory_make("playbin")
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201 |
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202 | bus = playBin.get_bus()
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203 | bus.enable_sync_message_emission()
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204 | bus.add_signal_watch()
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205 | bus.connect("message", _handlePlayBinMessage,
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206 | playBin, finishCallback, extra)
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207 |
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208 | path = os.path.join(_soundsDirectory, name)
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209 | playBin.set_property( "uri", "file://%s" % (path,))
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210 |
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211 | playBin.set_state(GST_STATE_PLAYING)
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212 | _bins.add(playBin)
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213 | except Exception, e:
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214 | print "mlx.sound.startSound: " + str(e)
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215 | if finishCallback is not None:
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216 | finishCallback(False, extra)
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217 |
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218 | def finalizeSound():
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219 | """Finalize the sound handling."""
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220 | pass
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221 |
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222 | def _handlePlayBinMessage(bus, message, bin, finishCallback, extra):
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223 | """Handle the end of the playback of a sound file."""
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224 |
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225 | # if message.type==GST_MESSAGE_EOS:
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226 | # _bins.remove(bin)
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227 | # if finishCallback is not None:
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228 | # finishCallback(True, extra)
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229 |
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230 | except:
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231 | print "The Gst library is missing from your system. It is needed for sound playback on Linux"
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232 | traceback.print_exc()
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233 | def initializeSound(soundsDirectory):
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234 | """Initialize the sound handling with the given directory containing
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235 | the sound files."""
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236 | pass
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237 |
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238 | def startSound(name, finishCallback = None, extra = None):
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239 | """Start playing back the given sound.
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240 |
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241 | FIXME: it does not do anything currently, but it should."""
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242 | print "sound.startSound:", name
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243 |
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244 | def finalizeSound():
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245 | """Finalize the sound handling."""
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246 | pass
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247 |
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248 | #------------------------------------------------------------------------------
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249 | #------------------------------------------------------------------------------
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250 |
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251 | if __name__ == "__main__":
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252 | def callback(result, extra):
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253 | print "callback", result, extra
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254 |
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255 | initializeSound("e:\\home\\vi\\tmp")
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256 | startSound("malev.mp3", finishCallback = callback, extra="malev.mp3")
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257 | time.sleep(5)
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258 | startSound("ding.wav", finishCallback = callback, extra="ding1.wav")
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259 | time.sleep(5)
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260 | startSound("ding.wav", finishCallback = callback, extra="ding2.wav")
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261 | time.sleep(5)
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262 | startSound("ding.wav", finishCallback = callback, extra="ding3.wav")
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263 | time.sleep(50)
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264 |
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265 | #------------------------------------------------------------------------------
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