output/Control: pass "force" flag to LockUpdate()

Reduce overhead by eliminating MultipleOutputs::ResetReopen().

src/output/Internal.hxx

@@ -383,10 +383,12 @@ public:
 	 * Opens or closes the device, depending on the "enabled"
 	 * flag.
 	 *
+	 * @param force true to ignore the #fail_timer
 	 * @return true if the device is open
 	 */
 	bool LockUpdate(const AudioFormat audio_format,
-			const MusicPipe &mp);
+			const MusicPipe &mp,
+			bool force);
 
 	void LockPlay();
 

src/output/MultipleOutputs.cxx

@@ -145,23 +145,8 @@ MultipleOutputs::AllowPlay()
 		ao->LockAllowPlay();
 }
 
-static void
-audio_output_reset_reopen(AudioOutput *ao)
-{
-	const ScopeLock protect(ao->mutex);
-
-	ao->fail_timer.Reset();
-}
-
-void
-MultipleOutputs::ResetReopen()
-{
-	for (auto ao : outputs)
-		audio_output_reset_reopen(ao);
-}
-
 bool
-MultipleOutputs::Update()
+MultipleOutputs::Update(bool force)
 {
 	bool ret = false;
 
@@ -169,7 +154,7 @@ MultipleOutputs::Update()
 		return false;
 
 	for (auto ao : outputs)
-		ret = ao->LockUpdate(input_audio_format, *pipe)
+		ret = ao->LockUpdate(input_audio_format, *pipe, force)
 			|| ret;
 
 	return ret;
@@ -190,7 +175,7 @@ MultipleOutputs::Play(MusicChunk *chunk)
 	assert(chunk != nullptr);
 	assert(chunk->CheckFormat(input_audio_format));
 
-	if (!Update())
+	if (!Update(false))
 		/* TODO: obtain real error */
 		throw std::runtime_error("Failed to open audio output");
 
@@ -224,9 +209,8 @@ MultipleOutputs::Open(const AudioFormat audio_format,
 
 	input_audio_format = audio_format;
 
-	ResetReopen();
 	EnableDisable();
-	Update();
+	Update(true);
 
 	std::exception_ptr first_error;
 
@@ -341,7 +325,7 @@ MultipleOutputs::Check()
 void
 MultipleOutputs::Pause()
 {
-	Update();
+	Update(false);
 
 	for (auto ao : outputs)
 		ao->LockPauseAsync();

src/output/MultipleOutputs.hxx

@@ -236,20 +236,13 @@ private:
 	 */
 	void AllowPlay();
 
-	/**
-	 * Resets the "reopen" flag on all audio devices.  MPD should
-	 * immediately retry to open the device instead of waiting for
-	 * the timeout when the user wants to start playback.
-	 */
-	void ResetReopen();
-
 	/**
 	 * Opens all output devices which are enabled, but closed.
 	 *
 	 * @return true if there is at least open output device which
 	 * is open
 	 */
-	bool Update();
+	bool Update(bool force);
 
 	/**
 	 * Has this chunk been consumed by all audio outputs?

src/output/OutputControl.cxx

@@ -159,12 +159,13 @@ AudioOutput::CloseWait()
 
 bool
 AudioOutput::LockUpdate(const AudioFormat audio_format,
-			const MusicPipe &mp)
+			const MusicPipe &mp,
+			bool force)
 {
 	const ScopeLock protect(mutex);
 
 	if (enabled && really_enabled) {
-		if (!fail_timer.IsDefined() ||
+		if (force || !fail_timer.IsDefined() ||
 		    fail_timer.Check(REOPEN_AFTER * 1000)) {
 			return Open(audio_format, mp);
 		}