Module: Audio

Defined in:
ext/audio/audio.c

Class Method Summary collapse

Class Method Details

.add_delay_tap(channel_id, time_ms, volume) ⇒ Object

============================================================================



481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
 
# File 'ext/audio/audio.c', line 481

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 



164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
 
# File 'ext/audio/audio.c', line 164

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

============================================================================



549
550
551
552
553
554
555
556
557
558
559
560
 
# File 'ext/audio/audio.c', line 549

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

============================================================================



94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# 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;
    config.channels = 2;

    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

============================================================================



140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
# File 'ext/audio/audio.c', line 140

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

============================================================================



618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
 
# File 'ext/audio/audio.c', line 618

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 



667
668
669
670
671
672
673
674
675
676
677
 
# File 'ext/audio/audio.c', line 667

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 



357
358
359
360
361
362
363
364
365
366
367
368
 
# File 'ext/audio/audio.c', line 357

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



225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
 
# File 'ext/audio/audio.c', line 225

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 



501
502
503
504
505
506
507
508
509
510
511
512
513
 
# File 'ext/audio/audio.c', line 501

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 



639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
 
# File 'ext/audio/audio.c', line 639

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 



370
371
372
373
374
375
376
377
378
379
380
381
 
# File 'ext/audio/audio.c', line 370

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 



449
450
451
452
453
454
455
456
457
458
459
460
461
 
# File 'ext/audio/audio.c', line 449

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 



530
531
532
533
534
535
536
537
538
539
540
541
542
543
 
# File 'ext/audio/audio.c', line 530

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 



515
516
517
518
519
520
521
522
523
524
525
526
527
528
 
# File 'ext/audio/audio.c', line 515

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 



463
464
465
466
467
468
469
470
471
472
473
474
475
 
# File 'ext/audio/audio.c', line 463

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 



435
436
437
438
439
440
441
442
443
444
445
446
447
 
# File 'ext/audio/audio.c', line 435

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 



401
402
403
404
405
406
407
408
409
410
411
412
413
 
# File 'ext/audio/audio.c', line 401

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 



415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
 
# File 'ext/audio/audio.c', line 415

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 



575
576
577
578
579
580
581
582
583
584
585
586
 
# File 'ext/audio/audio.c', line 575

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 



601
602
603
604
605
606
607
608
609
610
611
612
 
# File 'ext/audio/audio.c', line 601

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 



562
563
564
565
566
567
568
569
570
571
572
573
 
# File 'ext/audio/audio.c', line 562

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 



588
589
590
591
592
593
594
595
596
597
598
599
 
# File 'ext/audio/audio.c', line 588

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

============================================================================



387
388
389
390
391
392
393
394
395
396
397
398
399
 
# File 'ext/audio/audio.c', line 387

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 



336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
 
# File 'ext/audio/audio.c', line 336

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;
}