Module: Audio

Defined in:
ext/audio/audio.c

Class Method Summary collapse

Class Method Details

.duration(clip) ⇒ Object

Audio.duration(clip) - Get duration of clip in seconds



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# File 'ext/audio/audio.c', line 110

VALUE audio_duration(VALUE self, VALUE clip)
{
    int clip_id = NUM2INT(clip);

    if (clip_id < 0 || clip_id >= sound_count || sounds[clip_id] == NULL) {
        rb_raise(rb_eArgError, "Invalid clip ID: %d", clip_id);
        return Qnil;
    }

    float length;
    ma_result result = ma_sound_get_length_in_seconds(sounds[clip_id], &length);
    if (result != MA_SUCCESS) {
        return Qnil;
    }

    return rb_float_new(length);
}

.init ⇒ Object

Audio.init - Initialize the audio engine



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# File 'ext/audio/audio.c', line 283

VALUE audio_init(VALUE self)
{
    if (engine_initialized) {
        return Qnil;
    }

    // Check for null driver (for CI environments without audio devices)
    // Usage: NATIVE_AUDIO_DRIVER=null ruby script.rb
    const char *driver = getenv("NATIVE_AUDIO_DRIVER");
    int use_null = (driver != NULL && strcmp(driver, "null") == 0);

    ma_engine_config config = ma_engine_config_init();
    config.listenerCount = 1;

    if (use_null) {
        ma_backend backends[] = { ma_backend_null };
        ma_result ctx_result = ma_context_init(backends, 1, NULL, &context);
        if (ctx_result != MA_SUCCESS) {
            rb_raise(rb_eRuntimeError, "Failed to initialize null audio context");
            return Qnil;
        }
        context_initialized = 1;
        using_null_backend = 1;
        config.pContext = &context;
    }

    ma_result result = ma_engine_init(&config, &engine);

    if (result != MA_SUCCESS) {
        if (context_initialized) {
            ma_context_uninit(&context);
            context_initialized = 0;
        }
        rb_raise(rb_eRuntimeError, "Failed to initialize audio engine");
        return Qnil;
    }

    engine_initialized = 1;
    rb_set_end_proc(cleanup_audio, Qnil);

    return Qnil;
}

.load(file) ⇒ Object

Audio.load(path) - Load an audio file, returns clip ID



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# File 'ext/audio/audio.c', line 85

VALUE audio_load(VALUE self, VALUE file)
{
    const char *path = StringValueCStr(file);

    ma_sound *sound = (ma_sound *)malloc(sizeof(ma_sound));
    if (sound == NULL) {
        rb_raise(rb_eRuntimeError, "Failed to allocate memory for sound");
        return Qnil;
    }

    ma_result result = ma_sound_init_from_file(&engine, path, MA_SOUND_FLAG_DECODE, NULL, NULL, sound);
    if (result != MA_SUCCESS) {
        free(sound);
        rb_raise(rb_eRuntimeError, "Failed to load audio file: %s", path);
        return Qnil;
    }

    int id = sound_count;
    sounds[id] = sound;
    sound_count++;

    return rb_int2inum(id);
}

.pause(channel_id) ⇒ Object

Audio.pause(channel) - Pause playback



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# File 'ext/audio/audio.c', line 192

VALUE audio_pause(VALUE self, VALUE channel_id)
{
    int channel = NUM2INT(channel_id);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    ma_sound_stop(channels[channel]);

    return Qnil;
}

.play(channel_id, clip) ⇒ Object

Audio.play(channel, clip) - Play a clip on a channel



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# File 'ext/audio/audio.c', line 133

VALUE audio_play(VALUE self, VALUE channel_id, VALUE clip)
{
    int channel = NUM2INT(channel_id);
    int clip_id = NUM2INT(clip);

    if (clip_id < 0 || clip_id >= sound_count || sounds[clip_id] == NULL) {
        rb_raise(rb_eArgError, "Invalid clip ID: %d", clip_id);
        return Qnil;
    }

    if (channel < 0 || channel >= MAX_CHANNELS) {
        rb_raise(rb_eArgError, "Invalid channel ID: %d", channel);
        return Qnil;
    }

    // Clean up existing sound on this channel
    if (channels[channel] != NULL) {
        ma_sound_stop(channels[channel]);
        ma_sound_uninit(channels[channel]);
        free(channels[channel]);
        channels[channel] = NULL;
    }

    // Create a copy of the sound for playback
    ma_sound *playback = (ma_sound *)malloc(sizeof(ma_sound));
    if (playback == NULL) {
        rb_raise(rb_eRuntimeError, "Failed to allocate memory for playback");
        return Qnil;
    }

    ma_result result = ma_sound_init_copy(&engine, sounds[clip_id], 0, NULL, playback);
    if (result != MA_SUCCESS) {
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to create sound copy for playback");
        return Qnil;
    }

    channels[channel] = playback;
    ma_sound_start(playback);

    return rb_int2inum(channel);
}

.resume(channel_id) ⇒ Object

Audio.resume(channel) - Resume playback



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# File 'ext/audio/audio.c', line 206

VALUE audio_resume(VALUE self, VALUE channel_id)
{
    int channel = NUM2INT(channel_id);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    ma_sound_start(channels[channel]);

    return Qnil;
}

.set_pitch(channel_id, pitch) ⇒ Object

Audio.set_pitch(channel, pitch) - Set pitch (1.0 = normal)



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# File 'ext/audio/audio.c', line 240

VALUE audio_set_pitch(VALUE self, VALUE channel_id, VALUE pitch)
{
    int channel = NUM2INT(channel_id);
    float p = (float)NUM2DBL(pitch);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    ma_sound_set_pitch(channels[channel], p);

    return Qnil;
}

.set_pos(channel_id, angle, distance) ⇒ Object

distance: 0=close, 255=far



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# File 'ext/audio/audio.c', line 257

VALUE audio_set_pos(VALUE self, VALUE channel_id, VALUE angle, VALUE distance)
{
    int channel = NUM2INT(channel_id);
    int ang = NUM2INT(angle);
    int dist = NUM2INT(distance);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    // Convert polar to cartesian
    float rad = ang * (MA_PI / 180.0f);
    float normalized_dist = dist / 255.0f;
    float x = normalized_dist * sinf(rad);
    float z = -normalized_dist * cosf(rad);

    ma_sound_set_position(channels[channel], x, 0.0f, z);

    return Qnil;
}

.set_volume(channel_id, volume) ⇒ Object

Audio.set_volume(channel, volume) - Set volume (0-128)



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# File 'ext/audio/audio.c', line 224

VALUE audio_set_volume(VALUE self, VALUE channel_id, VALUE volume)
{
    int channel = NUM2INT(channel_id);
    int vol = NUM2INT(volume);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    float normalized_volume = vol / 128.0f;
    ma_sound_set_volume(channels[channel], normalized_volume);

    return Qnil;
}

.stop(channel_id) ⇒ Object

Audio.stop(channel) - Stop playback and rewind



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# File 'ext/audio/audio.c', line 177

VALUE audio_stop(VALUE self, VALUE channel_id)
{
    int channel = NUM2INT(channel_id);

    if (channel < 0 || channel >= MAX_CHANNELS || channels[channel] == NULL) {
        return Qnil;
    }

    ma_sound_stop(channels[channel]);
    ma_sound_seek_to_pcm_frame(channels[channel], 0);

    return Qnil;
}