Slow motion mode.

config.def.h

@@ -271,6 +271,9 @@ static const bool block_sram_overwrite = false;
 // When the ROM is loaded, state index will be set to the highest existing value.
 static const bool savestate_auto_index = false;
 
+// Slowmotion ratio.
+static const float slowmotion_ratio = 3.0;
+
 
 ////////////////////
 // Keybinds, Joypad
@@ -323,6 +326,7 @@ static const struct snes_keybind snes_keybinds_1[] = {
    { true, SSNES_DSP_CONFIG,                 SK_c,      NO_BTN,      AXIS_NONE },
    { true, SSNES_MUTE,                       SK_F9,     NO_BTN,      AXIS_NONE },
    { true, SSNES_NETPLAY_FLIP,               SK_i,      NO_BTN,      AXIS_NONE },
+   { true, SSNES_SLOWMOTION,                 SK_e,      NO_BTN,      AXIS_NONE },
 };
 
 // Player 2-5

driver.c

@@ -333,7 +333,7 @@ void init_audio(void)
    g_extern.audio_data.data_ptr = 0;
 
    ssnes_assert(g_settings.audio.out_rate < g_settings.audio.in_rate * AUDIO_MAX_RATIO);
-   ssnes_assert(g_extern.audio_data.outsamples = (float*)malloc(max_bufsamples * sizeof(float) * AUDIO_MAX_RATIO));
+   ssnes_assert(g_extern.audio_data.outsamples = (float*)malloc(max_bufsamples * sizeof(float) * AUDIO_MAX_RATIO * g_settings.slowmotion_ratio));
 
    g_extern.audio_data.orig_src_ratio =
       g_extern.audio_data.src_ratio =

driver.h

@@ -58,6 +58,7 @@ enum
    SSNES_DSP_CONFIG,
    SSNES_MUTE,
    SSNES_NETPLAY_FLIP,
+   SSNES_SLOWMOTION,
 
 #ifdef SSNES_CONSOLE
    SSNES_CHEAT_INPUT,

general.h

@@ -167,6 +167,8 @@ struct settings
    size_t rewind_buffer_size;
    unsigned rewind_granularity;
 
+   float slowmotion_ratio;
+
    bool pause_nonactive;
    unsigned autosave_interval;
 
@@ -373,6 +375,7 @@ struct global
    // Pausing support
    bool is_paused;
    bool is_oneshot;
+   bool is_slowmotion;
 
    // Autosave support.
    autosave_t *autosave[2];

settings.c

@@ -202,6 +202,7 @@ void config_set_defaults(void)
    g_settings.rewind_enable = rewind_enable;
    g_settings.rewind_buffer_size = rewind_buffer_size;
    g_settings.rewind_granularity = rewind_granularity;
+   g_settings.slowmotion_ratio = slowmotion_ratio;
    g_settings.pause_nonactive = pause_nonactive;
    g_settings.autosave_interval = autosave_interval;
 
@@ -458,6 +459,9 @@ bool config_load_file(const char *path)
       g_settings.rewind_buffer_size = buffer_size * UINT64_C(1000000);
 
    CONFIG_GET_INT(rewind_granularity, "rewind_granularity");
+   CONFIG_GET_FLOAT(slowmotion_ratio, "slowmotion_ratio");
+   if (g_settings.slowmotion_ratio < 1.0f)
+      g_settings.slowmotion_ratio = 1.0f;
 
    CONFIG_GET_BOOL(pause_nonactive, "pause_nonactive");
    CONFIG_GET_INT(autosave_interval, "autosave_interval");
@@ -573,6 +577,7 @@ static const struct bind_map bind_maps[MAX_PLAYERS][SSNES_BIND_LIST_END] = {
       DECLARE_BIND(dsp_config,            SSNES_DSP_CONFIG),
       DECLARE_BIND(audio_mute,            SSNES_MUTE),
       DECLARE_BIND(netplay_flip_players,  SSNES_NETPLAY_FLIP),
+      DECLARE_BIND(slowmotion,            SSNES_SLOWMOTION),
    },
 
    DECL_PLAYER(2),

ssnes.c

@@ -307,6 +307,8 @@ static bool audio_flush(const int16_t *data, size_t samples)
          readjust_audio_input_rate();
 
       src_data.ratio = g_extern.audio_data.src_ratio;
+      if (g_extern.is_slowmotion)
+         src_data.ratio *= g_settings.slowmotion_ratio;
 
       resampler_process(g_extern.audio_data.source, &src_data);
 
@@ -1750,6 +1752,16 @@ static void check_rewind(void)
    psnes_set_audio_sample(g_extern.frame_is_reverse ? audio_sample_rewind : audio_sample);
 }
 
+static void check_slowmotion(void)
+{
+   g_extern.is_slowmotion = driver.input->key_pressed(driver.input_data, SSNES_SLOWMOTION);
+   if (g_extern.is_slowmotion)
+   {
+      msg_queue_clear(g_extern.msg_queue);
+      msg_queue_push(g_extern.msg_queue, g_extern.frame_is_reverse ? "Slow motion rewind." : "Slow motion.", 0, 30);
+   }
+}
+
 static void check_movie_record(void)
 {
    static bool old_button = false;
@@ -2070,6 +2082,7 @@ static void do_state_checks(void)
       }
 
       check_rewind();
+      check_slowmotion();
 
       if (g_extern.bsv.movie_playback)
          check_movie_playback();

ssnes.cfg

@@ -278,6 +278,9 @@
 # Netplay flip players.
 # input_netplay_flip_players = i
 
+# Hold for slowmotion.
+# input_slowmotion = e
+
 #### Misc
 
 # Enable rewinding. This will take a performance hit when playing, so it is disabled by default.
@@ -331,3 +334,6 @@
 # There is no upper bound on the index.
 # savestate_auto_index = false
 
+# Slowmotion ratio. When slowmotion, game will slow down by factor.
+# slowmotion_ratio = 3.0
+