Midi: opt FluidSynth into NeedsSoftReset (Fixes #3135)

src/audio_decoder_midi.cpp

@@ -402,16 +402,17 @@ void AudioDecoderMidi::meta_event(int event, const void* data, std::size_t size)
 
 void AudioDecoderMidi::reset() {
 	// MIDI reset event
-	if (mididec->NeedsSoftReset()) {
-		// SoundOff every channel: necessary for synths like macOS which tend to get stuck
-		SendMessageToAllChannels(midimsg_all_sound_off(0));
-	}
 	SendMessageToAllChannels(midimsg_reset_all_controller(0));
 
 	// GM system on (resets most parameters)
 	const unsigned char gm_reset[] = { 0xF0, 0x7E, 0x7F, 0x09, 0x01, 0xF7 };
 	mididec->SendSysExMessage(gm_reset, sizeof(gm_reset));
 
+	// SoundOff every channel: only necessary for synths like macOS which tend to get stuck
+	if (mididec->NeedsSoftReset()) {
+		SendMessageToAllChannels(midimsg_all_sound_off(0));
+	}
+
 	// Set the Pitch bend range to 256
 	for (int channel = 0; channel < 16; channel++) {
 		auto midi_msg = midimsg_make(midi_event_control_change, channel, midi_set_reg_param_number_upper, 0);

src/decoder_fluidsynth.cpp

@@ -347,4 +347,8 @@ fluid_synth_t *FluidSynthDecoder::GetSynthInstance() {
 	}
 }
 
+bool FluidSynthDecoder::NeedsSoftReset() {
+	return true;
+}
+
 #endif

src/decoder_fluidsynth.h

@@ -69,6 +69,8 @@ class FluidSynthDecoder : public MidiDecoder {
 #endif
 	};
 
+	bool NeedsSoftReset() override;
+
 private:
 #if defined(HAVE_FLUIDSYNTH) || defined(HAVE_FLUIDLITE)
 	fluid_synth_t* GetSynthInstance();