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"
30 /** @brief Callback to request sample data */
31 static uaudio_callback
*coreaudio_callback
;
33 /** @brief Userdata for @ref coreaudio_callback */
34 static void *coreaudio_userdata
;
36 /** @brief Core Audio device ID */
37 static AudioDeviceID coreaudio_adid
;
39 /** @brief Core Audio option names */
40 static const char *const coreaudio_options
[] = {
45 /** @brief Callback from Core Audio
47 * Core Audio demands floating point samples but we provide integers.
48 * So there is a conversion step in here.
50 static OSStatus coreaudio_adioproc
51 (AudioDeviceID
attribute((unused
)) inDevice
,
52 const AudioTimeStamp
attribute((unused
)) *inNow
,
53 const AudioBufferList
attribute((unused
)) *inInputData
,
54 const AudioTimeStamp
attribute((unused
)) *inInputTime
,
55 AudioBufferList
*outOutputData
,
56 const AudioTimeStamp
attribute((unused
)) *inOutputTime
,
57 void attribute((unused
)) *inClientData
) {
58 /* Number of buffers we must fill */
59 unsigned nbuffers
= outOutputData
->mNumberBuffers
;
60 /* Pointer to buffer to fill */
61 AudioBuffer
*ab
= outOutputData
->mBuffers
;
64 /* Where to store converted sample data */
65 float *samples
= ab
->mData
;
66 /* Number of samples left to fill */
67 size_t nsamples
= ab
->mDataByteSize
/ sizeof (float);
70 /* Integer-format input buffer */
71 unsigned char input
[1024];
72 const size_t maxsamples
= sizeof input
/ uaudio_sample_size
;
73 /* How many samples we'll ask for */
74 const size_t ask
= nsamples
> maxsamples ? maxsamples
: nsamples
;
78 got
= coreaudio_callback(input
, ask
, coreaudio_userdata
);
79 /* Convert the samples and store in the output buffer */
82 if(uaudio_bits
== 16) {
83 const int16_t *ptr
= (int16_t *)input
;
86 *samples
++ = *ptr
++ * (0.5 / 32767);
89 const int8_t *ptr
= (int8_t *)input
;
92 *samples
++ = *ptr
++ * (0.5 / 127);
96 if(uaudio_bits
== 16) {
97 const uint16_t *ptr
= (uint16_t *)input
;
100 *samples
++ = ((int)*ptr
++ - 32768) * (0.5 / 32767);
103 const uint8_t *ptr
= (uint8_t *)input
;
106 *samples
++ = ((int)*ptr
++ - 128) * (0.5 / 127);
111 /* Move on to the next buffer */
118 static void coreaudio_start(uaudio_callback
*callback
,
122 AudioStreamBasicDescription asbd
;
125 if(uaudio_bits
!= 8 && uaudio_bits
!= 16)
126 disorder_fatal(0, "asked for %d bits/channel but only support 8 and 16",
128 coreaudio_callback
= callback
;
129 coreaudio_userdata
= userdata
;
130 device
= uaudio_get("device");
131 coreaudio_adid
= coreaudio_getdevice(device
);
132 /* Get the device properties */
133 propertySize
= sizeof asbd
;
134 status
= AudioDeviceGetProperty(coreaudio_adid
, 0, false,
135 kAudioDevicePropertyStreamFormat
,
136 &propertySize
, &asbd
);
138 coreaudio_fatal(status
, "AudioHardwareGetProperty");
139 D(("mSampleRate %f", asbd
.mSampleRate
));
140 D(("mFormatID %08lx", asbd
.mFormatID
));
141 D(("mFormatFlags %08lx", asbd
.mFormatFlags
));
142 D(("mBytesPerPacket %08lx", asbd
.mBytesPerPacket
));
143 D(("mFramesPerPacket %08lx", asbd
.mFramesPerPacket
));
144 D(("mBytesPerFrame %08lx", asbd
.mBytesPerFrame
));
145 D(("mChannelsPerFrame %08lx", asbd
.mChannelsPerFrame
));
146 D(("mBitsPerChannel %08lx", asbd
.mBitsPerChannel
));
147 D(("mReserved %08lx", asbd
.mReserved
));
148 /* Check that everything adds up */
149 if(asbd
.mFormatID
!= kAudioFormatLinearPCM
)
150 disorder_fatal(0, "audio device does not support kAudioFormatLinearPCM");
151 if(asbd
.mSampleRate
!= uaudio_rate
152 || asbd
.mChannelsPerFrame
!= (unsigned)uaudio_channels
) {
153 disorder_fatal(0, "want %dHz %d channels "
154 "but got %gHz %"PRIu32
" channels",
157 (double)asbd
.mSampleRate
,
158 (uint32_t)asbd
.mChannelsPerFrame
);
160 /* Add a collector callback */
161 status
= AudioDeviceAddIOProc(coreaudio_adid
, coreaudio_adioproc
, 0);
163 coreaudio_fatal(status
, "AudioDeviceAddIOProc");
166 static void coreaudio_stop(void) {
169 static void coreaudio_activate(void) {
172 status
= AudioDeviceStart(coreaudio_adid
, coreaudio_adioproc
);
174 coreaudio_fatal(status
, "AudioDeviceStart");
177 static void coreaudio_deactivate(void) {
180 status
= AudioDeviceStop(coreaudio_adid
, coreaudio_adioproc
);
182 coreaudio_fatal(status
, "AudioDeviceStop");
185 const struct uaudio uaudio_coreaudio
= {
187 .options
= coreaudio_options
,
188 .start
= coreaudio_start
,
189 .stop
= coreaudio_stop
,
190 .activate
= coreaudio_activate
,
191 .deactivate
= coreaudio_deactivate