2 * This file is part of DisOrder.
3 * Copyright (C) 2009 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file lib/uaudio-coreaudio.c
19 * @brief Support for Core Audio backend */
22 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
24 #include "coreaudio.h"
29 #include "configuration.h"
31 /** @brief Callback to request sample data */
32 static uaudio_callback *coreaudio_callback;
34 /** @brief Userdata for @ref coreaudio_callback */
35 static void *coreaudio_userdata;
37 /** @brief Core Audio device ID */
38 static AudioDeviceID coreaudio_adid;
40 /** @brief Core Audio option names */
41 static const char *const coreaudio_options[] = {
46 /** @brief Callback from Core Audio
48 * Core Audio demands floating point samples but we provide integers.
49 * So there is a conversion step in here.
51 static OSStatus coreaudio_adioproc
52 (AudioDeviceID attribute((unused)) inDevice,
53 const AudioTimeStamp attribute((unused)) *inNow,
54 const AudioBufferList attribute((unused)) *inInputData,
55 const AudioTimeStamp attribute((unused)) *inInputTime,
56 AudioBufferList *outOutputData,
57 const AudioTimeStamp attribute((unused)) *inOutputTime,
58 void attribute((unused)) *inClientData) {
59 /* Number of buffers we must fill */
60 unsigned nbuffers = outOutputData->mNumberBuffers;
61 /* Pointer to buffer to fill */
62 AudioBuffer *ab = outOutputData->mBuffers;
65 /* Where to store converted sample data */
66 float *samples = ab->mData;
67 /* Number of samples left to fill */
68 size_t nsamples = ab->mDataByteSize / sizeof (float);
71 /* Integer-format input buffer */
72 unsigned char input[1024];
73 const size_t maxsamples = sizeof input / uaudio_sample_size;
74 /* How many samples we'll ask for */
75 const size_t ask = nsamples > maxsamples ? maxsamples : nsamples;
79 got = coreaudio_callback(input, ask, coreaudio_userdata);
80 /* Convert the samples and store in the output buffer */
83 if(uaudio_bits == 16) {
84 const int16_t *ptr = (int16_t *)input;
87 *samples++ = *ptr++ * (0.5 / 32767);
90 const int8_t *ptr = (int8_t *)input;
93 *samples++ = *ptr++ * (0.5 / 127);
97 if(uaudio_bits == 16) {
98 const uint16_t *ptr = (uint16_t *)input;
101 *samples++ = ((int)*ptr++ - 32768) * (0.5 / 32767);
104 const uint8_t *ptr = (uint8_t *)input;
107 *samples++ = ((int)*ptr++ - 128) * (0.5 / 127);
112 /* Move on to the next buffer */
119 static void coreaudio_start(uaudio_callback *callback,
123 AudioStreamBasicDescription asbd;
126 if(uaudio_bits != 8 && uaudio_bits != 16)
127 disorder_fatal(0, "asked for %d bits/channel but only support 8 and 16",
129 coreaudio_callback = callback;
130 coreaudio_userdata = userdata;
131 device = uaudio_get("device", "default");
132 coreaudio_adid = coreaudio_getdevice(device);
133 /* Get the device properties */
134 propertySize = sizeof asbd;
135 status = AudioDeviceGetProperty(coreaudio_adid, 0, false,
136 kAudioDevicePropertyStreamFormat,
137 &propertySize, &asbd);
139 coreaudio_fatal(status, "AudioHardwareGetProperty");
140 D(("mSampleRate %f", asbd.mSampleRate));
141 D(("mFormatID %08"PRIx32, (uint32_t)asbd.mFormatID));
142 D(("mFormatFlags %08"PRIx32, (uint32_t)asbd.mFormatFlags));
143 D(("mBytesPerPacket %08"PRIx32, (uint32_t)asbd.mBytesPerPacket));
144 D(("mFramesPerPacket %08"PRIx32, (uint32_t)asbd.mFramesPerPacket));
145 D(("mBytesPerFrame %08"PRIx32, (uint32_t)asbd.mBytesPerFrame));
146 D(("mChannelsPerFrame %08"PRIx32, (uint32_t)asbd.mChannelsPerFrame));
147 D(("mBitsPerChannel %08"PRIx32, (uint32_t)asbd.mBitsPerChannel));
148 D(("mReserved %08"PRIx32, (uint32_t)asbd.mReserved));
149 /* Check that everything adds up */
150 if(asbd.mFormatID != kAudioFormatLinearPCM)
151 disorder_fatal(0, "audio device does not support kAudioFormatLinearPCM");
152 if(asbd.mSampleRate != uaudio_rate
153 || asbd.mChannelsPerFrame != (unsigned)uaudio_channels) {
154 disorder_fatal(0, "want %dHz %d channels "
155 "but got %gHz %"PRIu32" channels",
158 (double)asbd.mSampleRate,
159 (uint32_t)asbd.mChannelsPerFrame);
161 /* Add a collector callback */
162 status = AudioDeviceAddIOProc(coreaudio_adid, coreaudio_adioproc, 0);
164 coreaudio_fatal(status, "AudioDeviceAddIOProc");
167 static void coreaudio_stop(void) {
170 static void coreaudio_activate(void) {
173 status = AudioDeviceStart(coreaudio_adid, coreaudio_adioproc);
175 coreaudio_fatal(status, "AudioDeviceStart");
178 static void coreaudio_deactivate(void) {
181 status = AudioDeviceStop(coreaudio_adid, coreaudio_adioproc);
183 coreaudio_fatal(status, "AudioDeviceStop");
186 static void coreaudio_configure(void) {
187 uaudio_set("device", config->device);
190 const struct uaudio uaudio_coreaudio = {
192 .options = coreaudio_options,
193 .start = coreaudio_start,
194 .stop = coreaudio_stop,
195 .activate = coreaudio_activate,
196 .deactivate = coreaudio_deactivate,
197 .configure = coreaudio_configure,