nvwave: Don't close the audio device unless there hasn't been any aud…

…io played for 10 seconds.

source/nvwave.py

@@ -18,6 +18,7 @@
 import config
 from logHandler import log
 import os.path
+import core
 
 __all__ = (
 	"WavePlayer", "getOutputDeviceNames", "outputDeviceIDToName", "outputDeviceNameToID",
@@ -100,6 +101,9 @@ class WavePlayer(object):
 	"""
 	#: Minimum length of buffer (in ms) before audio is played.
 	MIN_BUFFER_MS = 300
+	#: The time (in ms) to wait after L{idle} is called before closing the audio
+	#: device. This is only applicable if L{closeWhenIdle} is C{True}.
+	IDLE_CLOSE_DELAY_MS = 10000
 	#: Flag used to signal that L{stop} has been called.
 	STOPPING = "stopping"
 	#: A lock to prevent WaveOut* functions from being called simultaneously, as this can cause problems even if they are for different HWAVEOUTs.
@@ -141,6 +145,7 @@ def __init__(self, channels, samplesPerSec, bitsPerSample,
 		#: If C{True}, close the output device when no audio is being played.
 		#: @type: bool
 		self.closeWhenIdle = closeWhenIdle
+		self._closeTimer = None
 		if buffered:
 			#: Minimum size of the buffer before audio is played.
 			#: However, this is ignored if an C{onDone} callback is provided to L{feed}.
@@ -158,13 +163,21 @@ def __init__(self, channels, samplesPerSec, bitsPerSample,
 		self._lock = threading.RLock()
 		self.open()
 
+	def _callOnMainThread(self, func, *args):
+		if threading.get_ident() == core.mainThreadId:
+			func(*args)
+		else:
+			wx.CallAfter(func, *args)
+
 	def open(self):
 		"""Open the output device.
 		This will be called automatically when required.
 		It is not an error if the output device is already open.
 		"""
 		with self._waveout_lock:
 			if self._waveout:
+				if self._closeTimer and self._closeTimer.IsRunning():
+					self._callOnMainThread(self._closeTimer.Stop)
 				return
 			wfx = WAVEFORMATEX()
 			wfx.wFormatTag = WAVE_FORMAT_PCM
@@ -269,7 +282,8 @@ def pause(self, switch):
 	def idle(self):
 		"""Indicate that this player is now idle; i.e. the current continuous segment  of audio is complete.
 		This will first call L{sync} to synchronise with playback.
-		If L{closeWhenIdle} is C{True}, the output device will be closed.
+		If L{closeWhenIdle} is C{True}, the output device will be closed if there
+		is no further audio within L{IDLE_CLOSE_DELAY_MS}.
 		A subsequent call to L{feed} will reopen it.
 		"""
 		if not self._minBufferSize:
@@ -286,7 +300,13 @@ def _idleUnbuffered(self):
 				if not self._waveout:
 					return
 				if self.closeWhenIdle:
-					self._close()
+					if not self._closeTimer:
+						# We need a cancellable timer, so we can't use core.callLater.
+						self._closeTimer = wx.PyTimer(self._close)
+					self._callOnMainThread(
+						self._closeTimer.Start, self.IDLE_CLOSE_DELAY_MS,
+						wx.TIMER_ONE_SHOT
+					)
 			if self._audioDucker: self._audioDucker.disable()
 
 	def stop(self):