aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/OSXOutputPlugin.cxx
blob: cbd27413ffd146c519c1300d506b683ad964565b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
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
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "OSXOutputPlugin.hxx"
#include "OutputAPI.hxx"
#include "util/fifo_buffer.h"
#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"

#include <glib.h>
#include <CoreAudio/AudioHardware.h>
#include <AudioUnit/AudioUnit.h>
#include <CoreServices/CoreServices.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "osx"

struct OSXOutput {
	struct audio_output base;

	/* configuration settings */
	OSType component_subtype;
	/* only applicable with kAudioUnitSubType_HALOutput */
	const char *device_name;

	AudioUnit au;
	Mutex mutex;
	Cond condition;

	struct fifo_buffer *buffer;
};

/**
 * The quark used for GError.domain.
 */
static inline GQuark
osx_output_quark(void)
{
	return g_quark_from_static_string("osx_output");
}

static bool
osx_output_test_default_device(void)
{
	/* on a Mac, this is always the default plugin, if nothing
	   else is configured */
	return true;
}

static void
osx_output_configure(OSXOutput *oo, const struct config_param *param)
{
	const char *device = config_get_block_string(param, "device", NULL);

	if (device == NULL || 0 == strcmp(device, "default")) {
		oo->component_subtype = kAudioUnitSubType_DefaultOutput;
		oo->device_name = NULL;
	}
	else if (0 == strcmp(device, "system")) {
		oo->component_subtype = kAudioUnitSubType_SystemOutput;
		oo->device_name = NULL;
	}
	else {
		oo->component_subtype = kAudioUnitSubType_HALOutput;
		/* XXX am I supposed to g_strdup() this? */
		oo->device_name = device;
	}
}

static struct audio_output *
osx_output_init(const struct config_param *param, GError **error_r)
{
	OSXOutput *oo = new OSXOutput();
	if (!ao_base_init(&oo->base, &osx_output_plugin, param, error_r)) {
		delete oo;
		return NULL;
	}

	osx_output_configure(oo, param);

	return &oo->base;
}

static void
osx_output_finish(struct audio_output *ao)
{
	OSXOutput *oo = (OSXOutput *)ao;

	delete oo;
}

static bool
osx_output_set_device(OSXOutput *oo, GError **error)
{
	bool ret = true;
	OSStatus status;
	UInt32 size, numdevices;
	AudioDeviceID *deviceids = NULL;
	char name[256];
	unsigned int i;

	if (oo->component_subtype != kAudioUnitSubType_HALOutput)
		goto done;

	/* how many audio devices are there? */
	status = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
					      &size,
					      NULL);
	if (status != noErr) {
		g_set_error(error, osx_output_quark(), status,
			    "Unable to determine number of OS X audio devices: %s",
			    GetMacOSStatusCommentString(status));
		ret = false;
		goto done;
	}

	/* what are the available audio device IDs? */
	numdevices = size / sizeof(AudioDeviceID);
	deviceids = new AudioDeviceID[numdevices];
	status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
					  &size,
					  deviceids);
	if (status != noErr) {
		g_set_error(error, osx_output_quark(), status,
			    "Unable to determine OS X audio device IDs: %s",
			    GetMacOSStatusCommentString(status));
		ret = false;
		goto done;
	}

	/* which audio device matches oo->device_name? */
	for (i = 0; i < numdevices; i++) {
		size = sizeof(name);
		status = AudioDeviceGetProperty(deviceids[i], 0, false,
						kAudioDevicePropertyDeviceName,
						&size, name);
		if (status != noErr) {
			g_set_error(error, osx_output_quark(), status,
				    "Unable to determine OS X device name "
				    "(device %u): %s",
				    (unsigned int) deviceids[i],
				    GetMacOSStatusCommentString(status));
			ret = false;
			goto done;
		}
		if (strcmp(oo->device_name, name) == 0) {
			g_debug("found matching device: ID=%u, name=%s",
				(unsigned int) deviceids[i], name);
			break;
		}
	}
	if (i == numdevices) {
		g_warning("Found no audio device with name '%s' "
			  "(will use default audio device)",
			  oo->device_name);
		goto done;
	}

	status = AudioUnitSetProperty(oo->au,
				      kAudioOutputUnitProperty_CurrentDevice,
				      kAudioUnitScope_Global,
				      0,
				      &(deviceids[i]),
				      sizeof(AudioDeviceID));
	if (status != noErr) {
		g_set_error(error, osx_output_quark(), status,
			    "Unable to set OS X audio output device: %s",
			    GetMacOSStatusCommentString(status));
		ret = false;
		goto done;
	}
	g_debug("set OS X audio output device ID=%u, name=%s",
		(unsigned int) deviceids[i], name);

done:
	delete[] deviceids;
	return ret;
}

static OSStatus
osx_render(void *vdata,
	   G_GNUC_UNUSED AudioUnitRenderActionFlags *io_action_flags,
	   G_GNUC_UNUSED const AudioTimeStamp *in_timestamp,
	   G_GNUC_UNUSED UInt32 in_bus_number,
	   G_GNUC_UNUSED UInt32 in_number_frames,
	   AudioBufferList *buffer_list)
{
	OSXOutput *od = (OSXOutput *) vdata;
	AudioBuffer *buffer = &buffer_list->mBuffers[0];
	size_t buffer_size = buffer->mDataByteSize;

	assert(od->buffer != NULL);

	od->mutex.lock();

	size_t nbytes;
	const void *src = fifo_buffer_read(od->buffer, &nbytes);

	if (src != NULL) {
		if (nbytes > buffer_size)
			nbytes = buffer_size;

		memcpy(buffer->mData, src, nbytes);
		fifo_buffer_consume(od->buffer, nbytes);
	} else
		nbytes = 0;

	od->condition.signal();
	od->mutex.unlock();

	buffer->mDataByteSize = nbytes;

	unsigned i;
	for (i = 1; i < buffer_list->mNumberBuffers; ++i) {
		buffer = &buffer_list->mBuffers[i];
		buffer->mDataByteSize = 0;
	}

	return 0;
}

static bool
osx_output_enable(struct audio_output *ao, GError **error_r)
{
	OSXOutput *oo = (OSXOutput *)ao;

	ComponentDescription desc;
	desc.componentType = kAudioUnitType_Output;
	desc.componentSubType = oo->component_subtype;
	desc.componentManufacturer = kAudioUnitManufacturer_Apple;
	desc.componentFlags = 0;
	desc.componentFlagsMask = 0;

	Component comp = FindNextComponent(NULL, &desc);
	if (comp == 0) {
		g_set_error(error_r, osx_output_quark(), 0,
			    "Error finding OS X component");
		return false;
	}

	OSStatus status = OpenAComponent(comp, &oo->au);
	if (status != noErr) {
		g_set_error(error_r, osx_output_quark(), status,
			    "Unable to open OS X component: %s",
			    GetMacOSStatusCommentString(status));
		return false;
	}

	if (!osx_output_set_device(oo, error_r)) {
		CloseComponent(oo->au);
		return false;
	}

	AURenderCallbackStruct callback;
	callback.inputProc = osx_render;
	callback.inputProcRefCon = oo;

	ComponentResult result =
		AudioUnitSetProperty(oo->au,
				     kAudioUnitProperty_SetRenderCallback,
				     kAudioUnitScope_Input, 0,
				     &callback, sizeof(callback));
	if (result != noErr) {
		CloseComponent(oo->au);
		g_set_error(error_r, osx_output_quark(), result,
			    "unable to set callback for OS X audio unit");
		return false;
	}

	return true;
}

static void
osx_output_disable(struct audio_output *ao)
{
	OSXOutput *oo = (OSXOutput *)ao;

	CloseComponent(oo->au);
}

static void
osx_output_cancel(struct audio_output *ao)
{
	OSXOutput *od = (OSXOutput *)ao;

	const ScopeLock protect(od->mutex);
	fifo_buffer_clear(od->buffer);
}

static void
osx_output_close(struct audio_output *ao)
{
	OSXOutput *od = (OSXOutput *)ao;

	AudioOutputUnitStop(od->au);
	AudioUnitUninitialize(od->au);

	fifo_buffer_free(od->buffer);
}

static bool
osx_output_open(struct audio_output *ao, struct audio_format *audio_format, GError **error)
{
	OSXOutput *od = (OSXOutput *)ao;

	AudioStreamBasicDescription stream_description;
	stream_description.mSampleRate = audio_format->sample_rate;
	stream_description.mFormatID = kAudioFormatLinearPCM;
	stream_description.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger;

	switch (audio_format->format) {
	case SAMPLE_FORMAT_S8:
		stream_description.mBitsPerChannel = 8;
		break;

	case SAMPLE_FORMAT_S16:
		stream_description.mBitsPerChannel = 16;
		break;

	case SAMPLE_FORMAT_S32:
		stream_description.mBitsPerChannel = 32;
		break;

	default:
		audio_format->format = SAMPLE_FORMAT_S32;
		stream_description.mBitsPerChannel = 32;
		break;
	}

#if G_BYTE_ORDER == G_BIG_ENDIAN
	stream_description.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
#endif

	stream_description.mBytesPerPacket =
		audio_format_frame_size(audio_format);
	stream_description.mFramesPerPacket = 1;
	stream_description.mBytesPerFrame = stream_description.mBytesPerPacket;
	stream_description.mChannelsPerFrame = audio_format->channels;

	ComponentResult result =
		AudioUnitSetProperty(od->au, kAudioUnitProperty_StreamFormat,
				     kAudioUnitScope_Input, 0,
				     &stream_description,
				     sizeof(stream_description));
	if (result != noErr) {
		g_set_error(error, osx_output_quark(), result,
			    "Unable to set format on OS X device");
		return false;
	}

	OSStatus status = AudioUnitInitialize(od->au);
	if (status != noErr) {
		g_set_error(error, osx_output_quark(), status,
			    "Unable to initialize OS X audio unit: %s",
			    GetMacOSStatusCommentString(status));
		return false;
	}

	/* create a buffer of 1s */
	od->buffer = fifo_buffer_new(audio_format->sample_rate *
				     audio_format_frame_size(audio_format));

	status = AudioOutputUnitStart(od->au);
	if (status != 0) {
		AudioUnitUninitialize(od->au);
		g_set_error(error, osx_output_quark(), status,
			    "unable to start audio output: %s",
			    GetMacOSStatusCommentString(status));
		return false;
	}

	return true;
}

static size_t
osx_output_play(struct audio_output *ao, const void *chunk, size_t size,
		G_GNUC_UNUSED GError **error)
{
	OSXOutput *od = (OSXOutput *)ao;

	const ScopeLock protect(od->mutex);

	void *dest;
	size_t max_length;

	while (true) {
		dest = fifo_buffer_write(od->buffer, &max_length);
		if (dest != NULL)
			break;

		/* wait for some free space in the buffer */
		od->condition.wait(od->mutex);
	}

	if (size > max_length)
		size = max_length;

	memcpy(dest, chunk, size);
	fifo_buffer_append(od->buffer, size);

	return size;
}

const struct audio_output_plugin osx_output_plugin = {
	"osx",
	osx_output_test_default_device,
	osx_output_init,
	osx_output_finish,
	osx_output_enable,
	osx_output_disable,
	osx_output_open,
	osx_output_close,
	nullptr,
	nullptr,
	osx_output_play,
	nullptr,
	osx_output_cancel,
	nullptr,
	nullptr,
};