Qt: Fix bounded fast forward with Qt Multimedia

CHANGES

@@ -44,6 +44,7 @@ Other fixes:
  - FFmpeg: Fix audio conversion producing gaps
  - Core: Improved lockstep driver reliability (Le Hoang Quyen)
  - GBA: Fix skipping BIOS on irregularly sized ROMs
+ - Qt: Fix bounded fast forward with Qt Multimedia
 Misc:
  - GBA Savedata: EEPROM performance fixes
  - GBA Savedata: Automatically map 1Mbit Flash files as 1Mbit Flash

src/platform/qt/CoreController.cpp

@@ -440,13 +440,21 @@ void CoreController::rewind(int states) {
 }
 
 void CoreController::setFastForward(bool enable) {
+	if (m_fastForward == enable) {
+		return;
+	}
 	m_fastForward = enable;
 	updateFastForward();
+	emit fastForwardChanged(enable);
 }
 
 void CoreController::forceFastForward(bool enable) {
+	if (m_fastForwardForced == enable) {
+		return;
+	}
 	m_fastForwardForced = enable;
 	updateFastForward();
+	emit fastForwardChanged(enable || m_fastForward);
 }
 
 void CoreController::loadState(int slot) {

src/platform/qt/Window.cpp

@@ -924,6 +924,7 @@ void Window::reloadAudioDriver() {
 	m_audioProcessor->requestSampleRate(opts->sampleRate);
 	m_audioProcessor->start();
 	connect(m_controller.get(), &CoreController::stopping, m_audioProcessor.get(), &AudioProcessor::stop);
+	connect(m_controller.get(), &CoreController::fastForwardChanged, m_audioProcessor.get(), &AudioProcessor::inputParametersChanged);
 }
 
 void Window::tryMakePortable() {