- [NEW] JA_FadeOutMusic(const int milliseconds);

jail_audio.cpp

@@ -38,15 +38,34 @@ bool            JA_musicEnabled = true;
 bool            JA_soundEnabled = true;
 SDL_AudioDeviceID sdlAudioDevice = 0;
 
+bool fading = false;
+int fade_start_time;
+int fade_duration;
+int fade_initial_volume;
+
 void audioCallback(void * userdata, uint8_t * stream, int len) {
     SDL_memset(stream, 0, len);
     if (current_music != NULL && current_music->state == JA_MUSIC_PLAYING) {
+        int volume = JA_musicVolume;
+        if (fading) {
+            int time = SDL_GetTicks();
+            if (time > (fade_start_time+fade_duration)) {
+                fading = false;
+                current_music->pos = 0;
+                current_music->state = JA_MUSIC_STOPPED;
+                volume = 0;
+            } else {
+                const int time_passed = time - fade_start_time;
+                const float percent = (float)time_passed / (float)fade_duration;
+                volume = JA_musicVolume * (1.0 - percent);
+            }
+        }
         const int size = SDL_min(len, (current_music->samples-current_music->pos)*2);
-        SDL_MixAudioFormat(stream, (Uint8*)(current_music->output+current_music->pos), AUDIO_S16, size, JA_musicVolume);
+        SDL_MixAudioFormat(stream, (Uint8*)(current_music->output+current_music->pos), AUDIO_S16, size, volume);
         current_music->pos += size/2;
         if (size < len) {
             if (current_music->times != 0) {
-                SDL_MixAudioFormat(stream+size, (Uint8*)current_music->output, AUDIO_S16, len-size, JA_musicVolume);
+                SDL_MixAudioFormat(stream+size, (Uint8*)current_music->output, AUDIO_S16, len-size, volume);
                 current_music->pos = (len-size)/2;
                 if (current_music->times > 0) current_music->times--;
             } else {
@@ -186,6 +205,17 @@ void JA_StopMusic()
     current_music->state = JA_MUSIC_STOPPED;
 }
 
+void JA_FadeOutMusic(const int milliseconds)
+{
+    if (!JA_musicEnabled) return;
+    if (current_music == NULL || current_music->state == JA_MUSIC_INVALID) return;
+
+    fading = true;
+    fade_start_time = SDL_GetTicks();
+    fade_duration = milliseconds;
+    fade_initial_volume = JA_musicVolume;
+}
+
 JA_Music_state JA_GetMusicState() {
     if (!JA_musicEnabled) return JA_MUSIC_DISABLED;
 

jail_audio.h

@@ -16,6 +16,7 @@ void JA_PlayMusic(JA_Music_t *music, const int loop = -1);
 void JA_PauseMusic();
 void JA_ResumeMusic();
 void JA_StopMusic();
+void JA_FadeOutMusic(const int milliseconds);
 JA_Music_state JA_GetMusicState();
 void JA_DeleteMusic(JA_Music_t *music);
 int JA_SetMusicVolume(int volume);

main.cpp

@@ -12,8 +12,8 @@ int main(int argc, char **argv) {
     sdlWindow = SDL_CreateWindow("JailAudio", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 320, 240, SDL_WINDOW_SHOWN);
     JA_Init(48000, AUDIO_S16, 2);
 
-    JA_Music music = JA_LoadMusic("intro2.ogg");
+    JA_Music_t *music = JA_LoadMusic("intro2.ogg");
-    JA_Sound peiv = JA_LoadSound("menu_select.wav");
+    JA_Sound_t *peiv = JA_LoadSound("menu_select.wav");
     int channel = -1;
 
     JA_PlayMusic(music, true);
@@ -42,6 +42,9 @@ int main(int argc, char **argv) {
                     case SDL_SCANCODE_6:                // Si pulsem la tecla '6' stopem definitivament el wav infinit
                         JA_StopChannel(channel);
                         break;
+                    case SDL_SCANCODE_0:                // Si pulsem la tecla '1' pausem o despausem la música
+                        JA_FadeOutMusic(1000);
+                        break;
                     case SDL_SCANCODE_UP:
                         volume = JA_SetVolume(volume+16);
                         break;