Added PulseAudio backend

This commit introduces PulseAudio support using PulseAudio's "Simple
API".

The PulseAudio backend will be included during compilation if
USE_PULSEAUDIO is defined.

core/oslib/audiobackend_pulseaudio.cpp

@@ -0,0 +1,48 @@
+#include "oslib/audiobackend_pulseaudio.h"
+#ifdef USE_PULSEAUDIO
+#include <sys/ioctl.h>
+#include <sys/fcntl.h>
+#include <sys/unistd.h>
+#include <pulse/simple.h>
+
+static pa_simple *pulse_stream;
+
+static void pulseaudio_init()
+{
+	pa_sample_spec ss;
+	ss.format = PA_SAMPLE_S16LE;
+	ss.channels = 2;
+	ss.rate = 44100;
+	/* Create a new playback stream */
+	pulse_stream = pa_simple_new(NULL, "reicast", PA_STREAM_PLAYBACK, NULL, "reicast", &ss, NULL, NULL, NULL);
+  if (!pulse_stream) {
+    fprintf(stderr, "PulseAudio: pa_simple_new() failed!\n");
+  }
+}
+
+static u32 pulseaudio_push(void* frame, u32 samples, bool wait)
+{
+	if (pa_simple_write(pulse_stream, frame, (size_t) samples*4, NULL) < 0) {
+      fprintf(stderr, "PulseAudio: pa_simple_write() failed!\n");
+	}
+}
+
+static void pulseaudio_term() {
+	if(pulse_stream != NULL)
+	{
+		// Make sure that every single sample was played
+		if (pa_simple_drain(pulse_stream, NULL) < 0) {
+        fprintf(stderr, "PulseAudio: pa_simple_drain() failed!\n");
+    }
+		pa_simple_free(pulse_stream);
+	}
+}
+
+audiobackend_t audiobackend_pulseaudio = {
+		"pulse", // Slug
+		"PulseAudio", // Name
+		&pulseaudio_init,
+		&pulseaudio_push,
+		&pulseaudio_term
+};
+#endif

core/oslib/audiobackend_pulseaudio.h

@@ -0,0 +1,4 @@
+#pragma once
+#include "oslib/audiostream.h"
+
+extern audiobackend_t audiobackend_pulseaudio;

core/oslib/audiostream.cpp

@@ -6,6 +6,7 @@
 #include "oslib/audiobackend_android.h"
 #include "oslib/audiobackend_alsa.h"
 #include "oslib/audiobackend_oss.h"
+#include "oslib/audiobackend_pulseaudio.h"
 
 struct SoundFrame { s16 l;s16 r; };
 #define SAMPLE_COUNT 512
@@ -82,6 +83,9 @@ void RegisterAllAudioBackends() {
 		#if HOST_OS==OS_LINUX && !defined(TARGET_NACL32) && !defined(ANDROID)
 		RegisterAudioBackend(&audiobackend_alsa);
 		#endif
+		#if USE_PULSEAUDIO
+		RegisterAudioBackend(&audiobackend_pulseaudio);
+		#endif
 		audiobackends_registered = true;
 }
 

shell/lin86/Makefile

@@ -6,6 +6,7 @@ X86_REC := 1
 #NO_REC := 1
 #NO_REND := 1
 WEBUI :=1 
+#USE_PULSEAUDIO := 1
 
 RZDCY_SRC_DIR = ../../core
 
@@ -73,6 +74,11 @@ LIBS	+= -ldl -lGL #for desktop gl
 #LIBS	+= -lEGL -lGLESv2 #-lglslcompiler -lIMGegl -lpvr2d -lsrv_um
 LIBS    += -lpthread -lasound -lX11
 
+ifdef USE_PULSEAUDIO
+	CXXFLAGS += -D USE_PULSEAUDIO
+	LIBS += -lpulse-simple
+endif
+
 
 OBJECTS=$(RZDCY_FILES:.cpp=.build_obj)
 OBJECTS:=$(OBJECTS:.c=.build_obj)