spu2x-sdl: add a gui setting to select the API

The purpose is to workaround bug with default API

Code is not ideal because SDL/gui are mixed. But it would be enough
for future release.

V2: ifdef SDL2 code

plugins/spu2-x/src/Linux/Config.cpp

@@ -19,6 +19,9 @@
 #include "Dialogs.h"
 #include "Config.h"
 
+#include <SDL.h>
+#include <SDL_audio.h>
+
 #ifdef PCSX2_DEVBUILD
 static const int LATENCY_MAX = 3000;
 #else
@@ -70,6 +73,7 @@ u32 OutputModule = 0;
 int SndOutLatencyMS = 300;
 int SynchMode = 0; // Time Stretch, Async or Disabled
 static u32 OutputAPI = 0;
+static u32 SdlOutputAPI = 0;
 
 int numSpeakers = 0;
 int dplLevel = 0;
@@ -121,10 +125,21 @@ void ReadSettings()
 	if (temp == L"OSS")  OutputAPI = 1;
 	if (temp == L"JACK") OutputAPI = 2;
 
+	CfgReadStr( L"SDL", L"HostApi", temp, L"pulseaudio" );
+	SdlOutputAPI = -1;
+#if SDL_MAJOR_VERSION >= 2
+	// YES It sucks ...
+	for (int i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
+		if (!temp.Cmp(SDL_GetAudioDriver(i)))
+			SdlOutputAPI = i;
+	}
+#endif
+
 	SndOutLatencyMS = CfgReadInt(L"OUTPUT",L"Latency", 300);
 	SynchMode = CfgReadInt( L"OUTPUT", L"Synch_Mode", 0);
 
 	PortaudioOut->ReadSettings();
+	SDLOut->ReadSettings();
 	SoundtouchCfg::ReadSettings();
 	DebugConfig::ReadSettings();
 
@@ -167,6 +182,7 @@ void WriteSettings()
 	CfgWriteInt(L"OUTPUT",L"Synch_Mode", SynchMode);
 
 	PortaudioOut->WriteSettings();
+	SDLOut->WriteSettings();
 	SoundtouchCfg::WriteSettings();
 	DebugConfig::WriteSettings();
 }
@@ -198,6 +214,9 @@ void DisplayDialog()
     GtkWidget *output_frame, *output_box;
     GtkWidget *mod_label, *mod_box;
     GtkWidget *api_label, *api_box;
+#if SDL_MAJOR_VERSION >= 2
+    GtkWidget *sdl_api_label, *sdl_api_box;
+#endif
     GtkWidget *latency_label, *latency_slide;
     GtkWidget *sync_label, *sync_box;
     GtkWidget *advanced_button;
@@ -242,6 +261,16 @@ void DisplayDialog()
     gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(api_box), "2 - JACK");
     gtk_combo_box_set_active(GTK_COMBO_BOX(api_box), OutputAPI);
 
+#if SDL_MAJOR_VERSION >= 2
+    sdl_api_label = gtk_label_new ("SDL API:");
+    sdl_api_box = gtk_combo_box_text_new ();
+    // YES It sucks ...
+    for (int i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
+        gtk_combo_box_text_append_text(GTK_COMBO_BOX_TEXT(sdl_api_box), SDL_GetAudioDriver(i));
+    }
+    gtk_combo_box_set_active(GTK_COMBO_BOX(sdl_api_box), SdlOutputAPI);
+#endif
+
     latency_label = gtk_label_new ("Latency:");
 #if GTK_MAJOR_VERSION < 3
     latency_slide = gtk_hscale_new_with_range(LATENCY_MIN, LATENCY_MAX, 5);
@@ -282,6 +311,10 @@ void DisplayDialog()
 	gtk_container_add(GTK_CONTAINER(output_box), mod_box);
 	gtk_container_add(GTK_CONTAINER(output_box), api_label);
 	gtk_container_add(GTK_CONTAINER(output_box), api_box);
+#if SDL_MAJOR_VERSION >= 2
+	gtk_container_add(GTK_CONTAINER(output_box), sdl_api_label);
+	gtk_container_add(GTK_CONTAINER(output_box), sdl_api_box);
+#endif
 	gtk_container_add(GTK_CONTAINER(output_box), sync_label);
 	gtk_container_add(GTK_CONTAINER(output_box), sync_box);
 	gtk_container_add(GTK_CONTAINER(output_box), latency_label);
@@ -327,6 +360,14 @@ void DisplayDialog()
 			}
 		}
 
+#if SDL_MAJOR_VERSION >= 2
+		if (gtk_combo_box_get_active(GTK_COMBO_BOX(sdl_api_box)) != -1) {
+			SdlOutputAPI = gtk_combo_box_get_active(GTK_COMBO_BOX(sdl_api_box));
+			// YES It sucks ...
+			SDLOut->SetApiSettings(wxString(SDL_GetAudioDriver(SdlOutputAPI)));
+		}
+#endif
+
     	SndOutLatencyMS = gtk_range_get_value(GTK_RANGE(latency_slide));
     	
     	if (gtk_combo_box_get_active(GTK_COMBO_BOX(sync_box)) != -1)

plugins/spu2-x/src/SndOut_SDL.cpp

@@ -18,6 +18,7 @@
 
 #include "Global.h"
 #include "SndOut.h"
+#include "Dialogs.h"
 
 #include <memory>
 
@@ -67,8 +68,13 @@ namespace {
 
 struct SDLAudioMod : public SndOutModule {
 	static SDLAudioMod mod;
+	wxString m_api;
 
 	s32 Init() {
+		ReadSettings();
+
+		fprintf(stderr, "SDL audio driver is %s\n", static_cast<const char*>(m_api.c_str()));
+
 		/* SDL backends will mangle the AudioSpec and change the sample count. If we reopen
 		 * the audio backend, we need to make sure we keep our desired samples in the spec */
 		spec.samples = desiredSamples;
@@ -96,20 +102,46 @@ struct SDLAudioMod : public SndOutModule {
 		SDL_CloseAudio();
 	}
 
+	~SDLAudioMod() {  Close(); }
+
 	s32 Test() const { return 0; }
-	void Configure(uptr parent) {}
-	void ReadSettings() {}
-	void SetApiSettings(wxString api) {}
-	void WriteSettings() const {};
 	int GetEmptySampleCount() { return 0; }
 
-	~SDLAudioMod() {  Close(); }
+	void Configure(uptr parent) {}
+
+	void ReadSettings() {
+		wxString api(L"EMPTYEMPTYEMPTY");
+		CfgReadStr(L"SDL", L"HostApi", api, L"pulseaudio");
+		SetApiSettings(api);
+	}
+
+	void WriteSettings() const {
+		CfgWriteStr(L"SDL", L"HostApi", m_api);
+	};
+
+	void SetApiSettings(wxString api) {
+#if SDL_MAJOR_VERSION >= 2
+		// Validate the api name
+		bool valid = false;
+		for (int i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
+			valid |= (api.Cmp(wxString(SDL_GetAudioDriver(i))) == 0);
+		}
+		if (valid) {
+			m_api = api;
+		} else {
+			fprintf(stderr, "SDL audio driver configuration is invalid!\n"
+					"It will be replaced by pulseaudio!\n");
+			m_api = "pulseaudio";
+		}
+#endif
+	}
+
 
 	private:
 	SDL_AudioSpec spec;
 
-	SDLAudioMod()
+	SDLAudioMod() : m_api("pulseaudio"),
-		: spec({SampleRate, format, channels, 0,
+		spec({SampleRate, format, channels, 0,
 				desiredSamples, 0, 0, &callback_fillBuffer, nullptr})
 		{
 			// Number of samples must be a multiple of packet size.