Module: Audio

Defined in:
ext/audio/audio.c

Class Method Summary collapse

Class Method Details

.add_delay_tap(channel_id, time_ms, volume) ⇒ Object 



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# File 'ext/audio/audio.c', line 480

VALUE audio_add_delay_tap(VALUE self, VALUE channel_id, VALUE time_ms, VALUE volume)
{
    int channel = NUM2INT(channel_id);
    float ms = (float)NUM2DBL(time_ms);
    float vol = (float)NUM2DBL(volume);

    if (channel < 0 || channel >= MAX_CHANNELS || delay_nodes[channel] == NULL) {
        rb_raise(rb_eArgError, "Invalid channel or no delay node: %d", channel);
        return Qnil;
    }

    int tap_id = multi_tap_delay_add_tap(delay_nodes[channel], ms, vol);
    if (tap_id < 0) {
        rb_raise(rb_eRuntimeError, "Failed to add delay tap (max taps reached)");
        return Qnil;
    }

    return rb_int2inum(tap_id);
}

.duration(clip) ⇒ Object 



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# File 'ext/audio/audio.c', line 163

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);
}

.enable_reverb(channel_id, enabled) ⇒ Object 



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# File 'ext/audio/audio.c', line 548

VALUE audio_enable_reverb(VALUE self, VALUE channel_id, VALUE enabled)
{
    int channel = NUM2INT(channel_id);
    ma_bool32 en = RTEST(enabled) ? MA_TRUE : MA_FALSE;

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

    reverb_set_enabled(reverb_nodes[channel], en);
    return Qnil;
}

.init ⇒ Object 



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# File 'ext/audio/audio.c', line 94

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

    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 



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# File 'ext/audio/audio.c', line 139

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);
}

.next_free_channel ⇒ Object 



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# File 'ext/audio/audio.c', line 617

VALUE audio_next_free_channel(VALUE self)
{
    cleanup_finished_channels(-1);

    // Prefer fully drained channels to preserve reverb tails
    for (int i = 0; i < MAX_CHANNELS; i++) {
        if (channels[i] == NULL && drain_until_frame[i] == 0) {
            return rb_int2inum(i);
        }
    }

    // Fall back to draining channels if all else is exhausted
    for (int i = 0; i < MAX_CHANNELS; i++) {
        if (channels[i] == NULL) {
            return rb_int2inum(i);
        }
    }

    return rb_int2inum(-1);
}

.on_channel_freed(callback) ⇒ Object 



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# File 'ext/audio/audio.c', line 666

VALUE audio_on_channel_freed(VALUE self, VALUE callback)
{
    if (channel_freed_callback != Qnil) {
        rb_gc_unregister_address(&channel_freed_callback);
    }

    channel_freed_callback = callback;
    rb_gc_register_address(&channel_freed_callback);

    return Qnil;
}

.pause(channel_id) ⇒ Object 



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# File 'ext/audio/audio.c', line 356

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

Playback



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

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;
    }

    cleanup_finished_channels(channel);

    // Cancel any pending drain timer for this channel
    drain_until_frame[channel] = 0;

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

    if (delay_nodes[channel] != NULL) {
        multi_tap_delay_uninit(delay_nodes[channel]);
        free(delay_nodes[channel]);
        delay_nodes[channel] = NULL;
    }

    if (reverb_nodes[channel] != NULL) {
        reverb_uninit(reverb_nodes[channel]);
        free(reverb_nodes[channel]);
        reverb_nodes[channel] = NULL;
    }

    // Create sound copy 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], MA_SOUND_FLAG_NO_DEFAULT_ATTACHMENT, NULL, playback);
    if (result != MA_SUCCESS) {
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to create sound copy for playback");
        return Qnil;
    }

    // Create delay node
    ma_uint32 sampleRate = ma_engine_get_sample_rate(&engine);
    ma_uint32 numChannels = ma_engine_get_channels(&engine);

    multi_tap_delay_node *delayNode = (multi_tap_delay_node *)malloc(sizeof(multi_tap_delay_node));
    if (delayNode == NULL) {
        ma_sound_uninit(playback);
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to allocate memory for delay node");
        return Qnil;
    }

    result = multi_tap_delay_init(delayNode, ma_engine_get_node_graph(&engine), sampleRate, numChannels);
    if (result != MA_SUCCESS) {
        free(delayNode);
        ma_sound_uninit(playback);
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to initialize delay node");
        return Qnil;
    }

    // Create reverb node
    reverb_node *reverbNode = (reverb_node *)malloc(sizeof(reverb_node));
    if (reverbNode == NULL) {
        multi_tap_delay_uninit(delayNode);
        free(delayNode);
        ma_sound_uninit(playback);
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to allocate memory for reverb node");
        return Qnil;
    }

    result = reverb_init(reverbNode, ma_engine_get_node_graph(&engine), sampleRate, numChannels);
    if (result != MA_SUCCESS) {
        free(reverbNode);
        multi_tap_delay_uninit(delayNode);
        free(delayNode);
        ma_sound_uninit(playback);
        free(playback);
        rb_raise(rb_eRuntimeError, "Failed to initialize reverb node");
        return Qnil;
    }

    // Route: sound -> delay_node -> reverb_node -> endpoint
    ma_node *endpoint = ma_engine_get_endpoint(&engine);
    ma_node_attach_output_bus(&reverbNode->base, 0, endpoint, 0);
    ma_node_attach_output_bus(&delayNode->base, 0, &reverbNode->base, 0);
    ma_node_attach_output_bus((ma_node *)playback, 0, &delayNode->base, 0);

    delay_nodes[channel] = delayNode;
    reverb_nodes[channel] = reverbNode;
    channels[channel] = playback;
    ma_sound_start(playback);

    return rb_int2inum(channel);
}

.remove_delay_tap(channel_id, tap_id) ⇒ Object 



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# File 'ext/audio/audio.c', line 500

VALUE audio_remove_delay_tap(VALUE self, VALUE channel_id, VALUE tap_id)
{
    int channel = NUM2INT(channel_id);
    int tap = NUM2INT(tap_id);

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

    multi_tap_delay_remove_tap(delay_nodes[channel], tap);

    return Qnil;
}

.reset_all_channels ⇒ Object 



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# File 'ext/audio/audio.c', line 638

VALUE audio_reset_all_channels(VALUE self)
{
    for (int i = 0; i < MAX_CHANNELS; i++) {
        if (channels[i] != NULL) {
            ma_sound_stop(channels[i]);
            ma_sound_uninit(channels[i]);
            free(channels[i]);
            channels[i] = NULL;
        }

        if (delay_nodes[i] != NULL) {
            multi_tap_delay_uninit(delay_nodes[i]);
            free(delay_nodes[i]);
            delay_nodes[i] = NULL;
        }

        if (reverb_nodes[i] != NULL) {
            reverb_uninit(reverb_nodes[i]);
            free(reverb_nodes[i]);
            reverb_nodes[i] = NULL;
        }

        drain_until_frame[i] = 0;
    }

    return Qnil;
}

.resume(channel_id) ⇒ Object 



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# File 'ext/audio/audio.c', line 369

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;
}

.seek(channel_id, seconds) ⇒ Object 



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# File 'ext/audio/audio.c', line 448

VALUE audio_seek(VALUE self, VALUE channel_id, VALUE seconds)
{
    int channel = NUM2INT(channel_id);
    float s = (float)NUM2DBL(seconds);

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

    ma_sound_seek_to_second(channels[channel], s);

    return Qnil;
}

.set_delay_tap_time(channel_id, tap_id, time_ms) ⇒ Object 



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# File 'ext/audio/audio.c', line 529

VALUE audio_set_delay_tap_time(VALUE self, VALUE channel_id, VALUE tap_id, VALUE time_ms)
{
    int channel = NUM2INT(channel_id);
    int tap = NUM2INT(tap_id);
    float ms = (float)NUM2DBL(time_ms);

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

    multi_tap_delay_set_time(delay_nodes[channel], tap, ms);

    return Qnil;
}

.set_delay_tap_volume(channel_id, tap_id, volume) ⇒ Object 



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# File 'ext/audio/audio.c', line 514

VALUE audio_set_delay_tap_volume(VALUE self, VALUE channel_id, VALUE tap_id, VALUE volume)
{
    int channel = NUM2INT(channel_id);
    int tap = NUM2INT(tap_id);
    float vol = (float)NUM2DBL(volume);

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

    multi_tap_delay_set_volume(delay_nodes[channel], tap, vol);

    return Qnil;
}

.set_looping(channel_id, looping) ⇒ Object 



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# File 'ext/audio/audio.c', line 462

VALUE audio_set_looping(VALUE self, VALUE channel_id, VALUE looping)
{
    int channel = NUM2INT(channel_id);
    ma_bool32 loop = RTEST(looping) ? MA_TRUE : MA_FALSE;

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

    ma_sound_set_looping(channels[channel], loop);

    return Qnil;
}

.set_pan(channel_id, pan) ⇒ Object 



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# File 'ext/audio/audio.c', line 434

VALUE audio_set_pan(VALUE self, VALUE channel_id, VALUE pan)
{
    int channel = NUM2INT(channel_id);
    float p = (float)NUM2DBL(pan);

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

    ma_sound_set_pan(channels[channel], p);

    return Qnil;
}

.set_pitch(channel_id, pitch) ⇒ Object 



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# File 'ext/audio/audio.c', line 400

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 



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# File 'ext/audio/audio.c', line 414

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;
    }

    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_reverb_damping(channel_id, damp) ⇒ Object 



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# File 'ext/audio/audio.c', line 574

VALUE audio_set_reverb_damping(VALUE self, VALUE channel_id, VALUE damp)
{
    int channel = NUM2INT(channel_id);
    float d = (float)NUM2DBL(damp);

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

    reverb_set_damping(reverb_nodes[channel], d);
    return Qnil;
}

.set_reverb_dry(channel_id, dry) ⇒ Object 



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# File 'ext/audio/audio.c', line 600

VALUE audio_set_reverb_dry(VALUE self, VALUE channel_id, VALUE dry)
{
    int channel = NUM2INT(channel_id);
    float d = (float)NUM2DBL(dry);

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

    reverb_set_dry(reverb_nodes[channel], d);
    return Qnil;
}

.set_reverb_room_size(channel_id, size) ⇒ Object 



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# File 'ext/audio/audio.c', line 561

VALUE audio_set_reverb_room_size(VALUE self, VALUE channel_id, VALUE size)
{
    int channel = NUM2INT(channel_id);
    float s = (float)NUM2DBL(size);

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

    reverb_set_room_size(reverb_nodes[channel], s);
    return Qnil;
}

.set_reverb_wet(channel_id, wet) ⇒ Object 



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# File 'ext/audio/audio.c', line 587

VALUE audio_set_reverb_wet(VALUE self, VALUE channel_id, VALUE wet)
{
    int channel = NUM2INT(channel_id);
    float w = (float)NUM2DBL(wet);

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

    reverb_set_wet(reverb_nodes[channel], w);
    return Qnil;
}

.set_volume(channel_id, volume) ⇒ Object 



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# File 'ext/audio/audio.c', line 386

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;
    }

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

    return Qnil;
}

.stop(channel_id) ⇒ Object 



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# File 'ext/audio/audio.c', line 335

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_uint64 now = ma_engine_get_time_in_pcm_frames(&engine);
    ma_uint32 sample_rate = ma_engine_get_sample_rate(&engine);

    ma_sound_stop(channels[channel]);
    ma_sound_uninit(channels[channel]);
    free(channels[channel]);
    channels[channel] = NULL;

    drain_until_frame[channel] = now + (ma_uint64)(REVERB_DRAIN_SECONDS * sample_rate);

    return Qnil;
}