Reinitialize the Midi libraries when returning to the game browser.

Now custom soundfonts are always loaded when switching the game instead of only the first time.

Fix #2916

src/audio_midi.cpp

@@ -125,3 +125,16 @@ std::unique_ptr<AudioDecoderBase> MidiDecoder::CreateFmMidi(bool resample) {
 
 	return mididec;
 }
+
+void MidiDecoder::Reset() {
+	works.fluidsynth = true;
+	works.wildmidi = true;
+
+#ifdef HAVE_LIBWILDMIDI
+	WildMidiDecoder::ResetState();
+#endif
+
+#if defined(HAVE_FLUIDSYNTH) || defined(HAVE_FLUIDLITE)
+	FluidSynthDecoder::ResetState();
+#endif
+}

src/audio_midi.h

@@ -194,6 +194,11 @@ class MidiDecoder {
 
 	static std::unique_ptr<AudioDecoderBase> CreateFmMidi(bool resample);
 
+	/**
+	 * Resets the global state of the midi libraries.
+	 */
+	static void Reset();
+
 protected:
 	int frequency = EP_MIDI_FREQ;
 };

src/decoder_fluidsynth.cpp

@@ -95,6 +95,9 @@ static fluid_fileapi_t fluidlite_vio = {
 
 namespace {
 	std::string preferred_soundfont;
+
+	bool once = false;
+	bool init = false;
 }
 
 struct FluidSynthDeleter {
@@ -208,10 +211,7 @@ FluidSynthDecoder::~FluidSynthDecoder() {
 }
 
 bool FluidSynthDecoder::Initialize(std::string& error_message) {
-	static bool init = false;
-	static bool once = false;
-
-	// only initialize once
+	// only initialize once until a new game starts
 	if (once)
 		return init;
 	once = true;
@@ -220,47 +220,51 @@ bool FluidSynthDecoder::Initialize(std::string& error_message) {
 	fluid_set_default_fileapi(&fluidlite_vio);
 #endif
 
+	global_settings.reset(new_fluid_settings());
 	if (!global_settings) {
-		global_settings.reset(new_fluid_settings());
-		if (!global_settings) {
-			return false;
-		}
-		fluid_settings_setstr(global_settings.get(), "player.timing-source", "sample");
-		fluid_settings_setint(global_settings.get(), "synth.lock-memory", 0);
+		return false;
+	}
+	fluid_settings_setstr(global_settings.get(), "player.timing-source", "sample");
+	fluid_settings_setint(global_settings.get(), "synth.lock-memory", 0);
 
-		fluid_settings_setnum(global_settings.get(), "synth.gain", 0.6);
-		fluid_settings_setnum(global_settings.get(), "synth.sample-rate", EP_MIDI_FREQ);
-		fluid_settings_setint(global_settings.get(), "synth.polyphony", 256);
+	fluid_settings_setnum(global_settings.get(), "synth.gain", 0.6);
+	fluid_settings_setnum(global_settings.get(), "synth.sample-rate", EP_MIDI_FREQ);
+	fluid_settings_setint(global_settings.get(), "synth.polyphony", 256);
 
 #if defined(HAVE_FLUIDSYNTH) && FLUIDSYNTH_VERSION_MAJOR > 1
-		fluid_settings_setint(global_settings.get(), "synth.reverb.active", 0);
-		fluid_settings_setint(global_settings.get(), "synth.chorus.active", 0);
+	fluid_settings_setint(global_settings.get(), "synth.reverb.active", 0);
+	fluid_settings_setint(global_settings.get(), "synth.chorus.active", 0);
 #else
-		fluid_settings_setstr(global_settings.get(), "synth.reverb.active", "no");
-		fluid_settings_setstr(global_settings.get(), "synth.chorus.active", "no");
+	fluid_settings_setstr(global_settings.get(), "synth.reverb.active", "no");
+	fluid_settings_setstr(global_settings.get(), "synth.chorus.active", "no");
 #endif
 
-		// Fluidsynth 1.x does not support VIO API for soundfonts
+	// Fluidsynth 1.x does not support VIO API for soundfonts
 #if defined(HAVE_FLUIDSYNTH) && FLUIDSYNTH_VERSION_MAJOR > 1
-		// owned by fluid_settings
-		global_loader = new_fluid_defsfloader(global_settings.get());
-		fluid_sfloader_set_callbacks(global_loader,
-				vio_open, vio_read, vio_seek, vio_tell, vio_close);
+	// owned by fluid_settings
+	global_loader = new_fluid_defsfloader(global_settings.get());
+	fluid_sfloader_set_callbacks(global_loader,
+			vio_open, vio_read, vio_seek, vio_tell, vio_close);
 #endif
-	}
 
+	global_synth.reset(create_synth(error_message));
 	if (!global_synth) {
-		global_synth.reset(create_synth(error_message));
-		if (!global_synth) {
-			return false;
-		}
+		return false;
 	}
 
 	init = true;
 
 	return init;
 }
 
+void FluidSynthDecoder::ResetState() {
+	once = false;
+	init = false;
+
+	global_synth.reset();
+	global_settings.reset();
+}
+
 void FluidSynthDecoder::SetSoundfont(StringView sf) {
 	preferred_soundfont = ToString(sf);
 }

src/decoder_fluidsynth.h

@@ -45,6 +45,7 @@ class FluidSynthDecoder : public MidiDecoder {
 	~FluidSynthDecoder() override;
 
 	static bool Initialize(std::string& error_message);
+	static void ResetState();
 
 	/**
 	 * Sets the name of the preferred soundfont.

src/decoder_wildmidi.cpp

@@ -39,7 +39,10 @@
 #define WILDMIDI_OPTS 0
 
 static void WildMidiDecoder_deinit() {
-	WildMidi_Shutdown();
+	if (init) {
+		WildMidi_Shutdown();
+		init = false;
+	}
 }
 
 #if LIBWILDMIDI_VERSION >= 1027 // at least 0.4.3
@@ -71,6 +74,11 @@ static struct _WM_VIO vio = {
 };
 #endif
 
+namespace {
+	bool once = false;
+	bool init = false;
+}
+
 WildMidiDecoder::~WildMidiDecoder() {
 	if (handle)
 		WildMidi_Close(handle);
@@ -80,10 +88,7 @@ bool WildMidiDecoder::Initialize(std::string& error_message) {
 	std::string config_file;
 	bool found = false;
 
-	static bool init = false;
-	static bool once = false;
-
-	// only initialize once
+	// only initialize once until a new game starts
 	if (once)
 		return init;
 	once = true;
@@ -289,11 +294,20 @@ bool WildMidiDecoder::Initialize(std::string& error_message) {
 #endif
 
 	// setup deinitialization
-	atexit(WildMidiDecoder_deinit);
+	static bool atexit_once = false;
+	if (!atexit_once) {
+		atexit_once = true;
+		atexit(WildMidiDecoder_deinit);
+	}
 
 	return true;
 }
 
+void WildMidiDecoder::ResetState() {
+	once = false;
+	WildMidiDecoder_deinit();
+}
+
 bool WildMidiDecoder::Open(std::vector<uint8_t>& data) {
 	// this should not happen
 	if (handle) {

src/decoder_wildmidi.h

@@ -34,6 +34,7 @@ class WildMidiDecoder : public MidiDecoder {
 	~WildMidiDecoder();
 
 	static bool Initialize(std::string& error_message);
+	static void ResetState();
 
 	// Audio Decoder interface
 	bool Open(std::vector<uint8_t>& data) override;

src/scene_gamebrowser.cpp

@@ -21,6 +21,7 @@
 #include <memory>
 #include "options.h"
 #include "scene_settings.h"
+#include "audio_midi.h"
 #include "audio_secache.h"
 #include "cache.h"
 #include "game_system.h"
@@ -49,6 +50,7 @@ void Scene_GameBrowser::Continue(SceneType /* prev_scene */) {
 
 	Cache::ClearAll();
 	AudioSeCache::Clear();
+	MidiDecoder::Reset();
 	lcf::Data::Clear();
 	Main_Data::Cleanup();