Add mute toggle.

config.def.h

@@ -267,6 +267,7 @@ static const struct snes_keybind snes_keybinds_1[] = {
    { SSNES_CHEAT_TOGGLE,               SK_u,      NO_BTN,      AXIS_NONE },
    { SSNES_SCREENSHOT,                 SK_PRINT,  NO_BTN,      AXIS_NONE },
    { SSNES_DSP_CONFIG,                 SK_c,      NO_BTN,      AXIS_NONE },
+   { SSNES_MUTE,                       SK_F9,     NO_BTN,      AXIS_NONE },
    { -1 }
 };
 

driver.h

@@ -52,6 +52,7 @@ enum
    SSNES_CHEAT_TOGGLE,
    SSNES_SCREENSHOT,
    SSNES_DSP_CONFIG,
+   SSNES_MUTE,
 
    SSNES_BIND_LIST_END
 };

general.h

@@ -231,6 +231,7 @@ struct global
       double src_ratio;
 
       bool use_float;
+      bool mute;
 
       float *outsamples;
       int16_t *conv_outsamples;

gfx/py_state/py_state.c

@@ -161,6 +161,7 @@ static void py_set_attrs(PyObject *mod)
    DECL_ATTR_SSNES(CHEAT_TOGGLE);
    DECL_ATTR_SSNES(SCREENSHOT);
    DECL_ATTR_SSNES(DSP_CONFIG);
+   DECL_ATTR_SSNES(MUTE);
 }
 
 static PyModuleDef SNESModule = {

settings.c

@@ -492,6 +492,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][MAX_BINDS - 1] = {
       DECLARE_BIND(cheat_toggle,          SSNES_CHEAT_TOGGLE)
       DECLARE_BIND(screenshot,            SSNES_SCREENSHOT)
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG)
+      DECLARE_BIND(audio_mute,            SSNES_MUTE)
    },
    {
       DECLARE_BIND(player2_a,             SNES_DEVICE_ID_JOYPAD_A)
@@ -528,6 +529,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][MAX_BINDS - 1] = {
       DECLARE_BIND(cheat_toggle,          SSNES_CHEAT_TOGGLE)
       DECLARE_BIND(screenshot,            SSNES_SCREENSHOT)
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG)
+      DECLARE_BIND(audio_mute,            SSNES_MUTE)
    },
    {
       DECLARE_BIND(player3_a,             SNES_DEVICE_ID_JOYPAD_A)
@@ -564,6 +566,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][MAX_BINDS - 1] = {
       DECLARE_BIND(cheat_toggle,          SSNES_CHEAT_TOGGLE)
       DECLARE_BIND(screenshot,            SSNES_SCREENSHOT)
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG)
+      DECLARE_BIND(audio_mute,            SSNES_MUTE)
    },
    {
       DECLARE_BIND(player4_a,             SNES_DEVICE_ID_JOYPAD_A)
@@ -600,6 +603,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][MAX_BINDS - 1] = {
       DECLARE_BIND(cheat_toggle,          SSNES_CHEAT_TOGGLE)
       DECLARE_BIND(screenshot,            SSNES_SCREENSHOT)
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG)
+      DECLARE_BIND(audio_mute,            SSNES_MUTE)
    },
    {
       DECLARE_BIND(player5_a,             SNES_DEVICE_ID_JOYPAD_A)
@@ -636,6 +640,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][MAX_BINDS - 1] = {
       DECLARE_BIND(cheat_toggle,          SSNES_CHEAT_TOGGLE)
       DECLARE_BIND(screenshot,            SSNES_SCREENSHOT)
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG)
+      DECLARE_BIND(audio_mute,            SSNES_MUTE)
    },
 };
 

ssnes.c

@@ -247,7 +247,7 @@ static void video_cached_frame(void)
 #endif
 }
 
-static bool audio_flush(const int16_t *data, unsigned samples)
+static bool audio_flush(const int16_t *data, size_t samples)
 {
 #ifdef HAVE_FFMPEG
    if (g_extern.recording)
@@ -302,20 +302,31 @@ static bool audio_flush(const int16_t *data, unsigned samples)
       output_frames = dsp_output.frames;
    }
 
+   union
+   {
+      float f[0x10000];
+      int16_t i[0x10000 * sizeof(float) / sizeof(int16_t)];
+   } static const empty_buf;
+
    if (g_extern.audio_data.use_float)
    {
-      if (driver.audio->write(driver.audio_data, output_data, output_frames * sizeof(float) * 2) < 0)
+      if (driver.audio->write(driver.audio_data,
+               g_extern.audio_data.mute ? empty_buf.f : output_data, output_frames * sizeof(float) * 2) < 0)
       {
          fprintf(stderr, "SSNES [ERROR]: Audio backend failed to write. Will continue without sound.\n");
          return false;
       }
    }
    else
+   {
+      if (!g_extern.audio_data.mute)
       {
          audio_convert_float_to_s16(g_extern.audio_data.conv_outsamples,
                output_data, output_frames * 2);
+      }
 
-      if (driver.audio->write(driver.audio_data, g_extern.audio_data.conv_outsamples,
+      if (driver.audio->write(driver.audio_data,
+               g_extern.audio_data.mute ? empty_buf.i : g_extern.audio_data.conv_outsamples,
                output_frames * sizeof(int16_t) * 2) < 0)
       {
          fprintf(stderr, "SSNES [ERROR]: Audio backend failed to write. Will continue without sound.\n");
@@ -1824,9 +1835,32 @@ static void check_dsp_config(void)
 }
 #endif
 
+static void check_mute(void)
+{
+   if (!g_extern.audio_active)
+      return;
+
+   static bool old_pressed = false;
+   bool pressed = driver.input->key_pressed(driver.input_data, SSNES_MUTE);
+   if (pressed && !old_pressed)
+   {
+      g_extern.audio_data.mute = !g_extern.audio_data.mute;
+
+      const char *msg = g_extern.audio_data.mute ? "Audio muted!" : "Audio unmuted!";
+      msg_queue_clear(g_extern.msg_queue);
+      msg_queue_push(g_extern.msg_queue, msg, 1, 180);
+
+      SSNES_LOG("%s\n", msg);
+   }
+
+   old_pressed = pressed;
+}
+
 static void do_state_checks(void)
 {
    check_screenshot();
+   check_mute();
+
    if (!g_extern.netplay)
    {
       check_pause();

ssnes.cfg

@@ -308,6 +308,9 @@
 # input_cheat_index_minus = t
 # input_cheat_toggle = u
 
+# Mute/unmute audio
+# input_audio_mute = f9
+
 # Take screenshot
 # input_screenshot = print_screen