- [FIX] Si no feia falta conversió de format, la música no apuntava correctament la duració al carregar

jail_audio.cpp

@@ -20,6 +20,7 @@ struct JA_Channel_t {
 
 struct JA_Music_t {
     int             samples {0};
+    Uint32          length {0};
     int             pos {0};
     int             times {0};
     short*          output {NULL};
@@ -38,16 +39,35 @@ 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) {
-        const int size = SDL_min(len, current_music->samples*2-current_music->pos);
+        int volume = JA_musicVolume;
-        SDL_MixAudioFormat(stream, (Uint8*)(current_music->output+current_music->pos), AUDIO_S16, size, JA_musicVolume);
+        if (fading) {
-        current_music->pos += size/2;
+            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->length - current_music->pos);
+        SDL_MixAudioFormat(stream, (Uint8*)(current_music->output)+current_music->pos, AUDIO_S16, size, volume);
+        current_music->pos += size;
         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;
+                current_music->pos = len-size;
                 if (current_music->times > 0) current_music->times--;
             } else {
                 current_music->pos = 0;
@@ -74,13 +94,26 @@ void audioCallback(void * userdata, uint8_t * stream, int len) {
     }
 }
 
-void JA_Init(const int freq, const SDL_AudioFormat format, const int channels) {
+void JA_Init(const int freq, const SDL_AudioFormat format, const int channels)
+{
+    #ifdef DEBUG
+    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_DEBUG);
+    #endif
+    
+    SDL_Log("Iniciant JailAudio...");
     JA_freq = freq;
     JA_format = format;
     JA_channels = channels;
     SDL_AudioSpec audioSpec{JA_freq, JA_format, JA_channels, 0, 1024, 0, 0, audioCallback, NULL};
     if (sdlAudioDevice != 0) SDL_CloseAudioDevice(sdlAudioDevice);
     sdlAudioDevice = SDL_OpenAudioDevice(NULL, 0, &audioSpec, NULL, 0);
+    if (sdlAudioDevice==0)
+    {
+        SDL_Log("FAILED!\n");
+        SDL_Log("Failed to initialize SDL audio!\n");
+    } else {
+        SDL_Log("OK!\n");
+    }
     SDL_PauseAudioDevice(sdlAudioDevice, 0);
 }
 
@@ -101,14 +134,17 @@ JA_Music_t *JA_LoadMusic(Uint8* buffer, Uint32 length)
 
     SDL_AudioCVT cvt;
     SDL_BuildAudioCVT(&cvt, AUDIO_S16, chan, samplerate, JA_format, JA_channels, JA_freq);
+    SDL_Log("Music length: %f\n", float(music->samples)/float(JA_freq));
     if (cvt.needed) {
         cvt.len = music->samples * chan * 2;
+        music->length = cvt.len;
         cvt.buf = (Uint8 *) SDL_malloc(cvt.len * cvt.len_mult);
         SDL_memcpy(cvt.buf, music->output, cvt.len);
         SDL_ConvertAudio(&cvt);
         free(music->output);
         music->output = (short*)cvt.buf;
     }
+    music->length = music->samples * chan * 2;
     music->pos = 0;
     music->state = JA_MUSIC_STOPPED;
 
@@ -172,6 +208,17 @@ 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;
 
@@ -191,6 +238,18 @@ int JA_SetMusicVolume(int volume)
     return JA_musicVolume;
 }
 
+void JA_SetMusicPosition(float value)
+{
+    if (!current_music) return;
+    current_music->pos = value * JA_freq;
+}
+
+float JA_GetMusicPosition()
+{
+    if (!current_music) return 0;
+    return float(current_music->pos)/float(JA_freq);
+}
+
 void JA_EnableMusic(const bool value)
 {
     if (!value && current_music != NULL && current_music->state==JA_MUSIC_PLAYING) JA_StopMusic();
@@ -260,6 +319,19 @@ int JA_PlaySound(JA_Sound_t *sound, const int loop)
     return channel;
 }
 
+int JA_PlaySoundOnChannel(JA_Sound_t *sound, const int channel, const int loop)
+{
+    if (!JA_soundEnabled) return -1;
+
+    if (channel >= JA_MAX_SIMULTANEOUS_CHANNELS) return -1;
+
+    channels[channel].sound = sound;
+    channels[channel].times = loop;
+    channels[channel].pos = 0;
+    channels[channel].state = JA_CHANNEL_PLAYING;
+    return channel;
+}
+
 void JA_DeleteSound(JA_Sound_t *sound)
 {
     for (int i = 0; i < JA_MAX_SIMULTANEOUS_CHANNELS; i++) {

jail_audio.h

@@ -16,15 +16,19 @@ 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);
+void JA_SetMusicPosition(float value);
+float JA_GetMusicPosition();
 void JA_EnableMusic(const bool value);
 
 JA_Sound_t *JA_NewSound(Uint8* buffer, Uint32 length);
 JA_Sound_t *JA_LoadSound(Uint8* buffer, Uint32 length);
 JA_Sound_t *JA_LoadSound(const char* filename);
 int JA_PlaySound(JA_Sound_t *sound, const int loop = 0);
+int JA_PlaySoundOnChannel(JA_Sound_t *sound, const int channel, const int loop = 0);
 void JA_PauseChannel(const int channel);
 void JA_ResumeChannel(const int channel);
 void JA_StopChannel(const int channel);

main.cpp

@@ -12,11 +12,11 @@ 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);
+    JA_PlayMusic(music, -1);
     int volume = 128;
     bool should_exit = false;
     while(!should_exit) {
@@ -42,6 +42,12 @@ 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_7:
+                        JA_PlayMusic(music, 0);
+                        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;