2 * This file is part of DisOrder
3 * Copyright (C) 2007 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 server/speaker-coreaudio.c
19 * @brief Support for @ref BACKEND_COREAUDIO
21 * Core Audio likes to make callbacks from a separate player thread
22 * which then fill in the required number of bytes of audio. We fit
23 * this into the existing architecture by means of a pipe between the
26 * We currently only support 16-bit 44100Hz stereo (and enforce this
27 * in @ref lib/configuration.c.) There are some nasty bodges in this
28 * code which depend on this and on further assumptions still...
30 * @todo support @ref config::device
35 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
38 #include <sys/socket.h>
40 #include <CoreAudio/AudioHardware.h>
42 #include "configuration.h"
45 #include "speaker-protocol.h"
48 /** @brief Core Audio Device ID */
49 static AudioDeviceID adid
;
51 /** @brief Pipe between main and player threads
53 * We'll write samples to pfd[1] and read them from pfd[0].
57 /** @brief Slot number in poll array */
60 /** @brief Callback from Core Audio */
61 static OSStatus adioproc
62 (AudioDeviceID
attribute((unused
)) inDevice
,
63 const AudioTimeStamp
attribute((unused
)) *inNow
,
64 const AudioBufferList
attribute((unused
)) *inInputData
,
65 const AudioTimeStamp
attribute((unused
)) *inInputTime
,
66 AudioBufferList
*outOutputData
,
67 const AudioTimeStamp
attribute((unused
)) *inOutputTime
,
68 void attribute((unused
)) *inClientData
) {
69 UInt32 nbuffers
= outOutputData
->mNumberBuffers
;
70 AudioBuffer
*ab
= outOutputData
->mBuffers
;
73 float *samplesOut
= ab
->mData
;
74 size_t samplesOutLeft
= ab
->mDataByteSize
/ sizeof (float);
75 int16_t input
[1024], *ptr
;
80 while(samplesOutLeft
> 0) {
81 /* Read some more data */
82 bytes
= samplesOutLeft
* sizeof (int16_t);
83 if(bytes
> sizeof input
)
86 bytes_read
= read(pfd
[0], input
, bytes
);
90 continue; /* just try again */
92 return 0; /* underrun - just play 0s */
94 fatal(errno
, "read error in core audio thread");
96 assert(bytes_read
% 4 == 0); /* TODO horrible bodge! */
97 samples
= bytes_read
/ sizeof (int16_t);
98 assert(samples
<= samplesOutLeft
);
100 samplesOutLeft
-= samples
;
102 *samplesOut
++ = *ptr
++ * (0.5 / 32767);
110 /** @brief Core Audio backend initialization */
111 static void coreaudio_init(void) {
114 AudioStreamBasicDescription asbd
;
116 propertySize
= sizeof adid
;
117 status
= AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice
,
118 &propertySize
, &adid
);
120 fatal(0, "AudioHardwareGetProperty: %d", (int)status
);
121 if(adid
== kAudioDeviceUnknown
)
122 fatal(0, "no output device");
123 propertySize
= sizeof asbd
;
124 status
= AudioDeviceGetProperty(adid
, 0, false,
125 kAudioDevicePropertyStreamFormat
,
126 &propertySize
, &asbd
);
128 fatal(0, "AudioHardwareGetProperty: %d", (int)status
);
129 D(("mSampleRate %f", asbd
.mSampleRate
));
130 D(("mFormatID %08lx", asbd
.mFormatID
));
131 D(("mFormatFlags %08lx", asbd
.mFormatFlags
));
132 D(("mBytesPerPacket %08lx", asbd
.mBytesPerPacket
));
133 D(("mFramesPerPacket %08lx", asbd
.mFramesPerPacket
));
134 D(("mBytesPerFrame %08lx", asbd
.mBytesPerFrame
));
135 D(("mChannelsPerFrame %08lx", asbd
.mChannelsPerFrame
));
136 D(("mBitsPerChannel %08lx", asbd
.mBitsPerChannel
));
137 D(("mReserved %08lx", asbd
.mReserved
));
138 if(asbd
.mFormatID
!= kAudioFormatLinearPCM
)
139 fatal(0, "audio device does not support kAudioFormatLinearPCM");
140 status
= AudioDeviceAddIOProc(adid
, adioproc
, 0);
142 fatal(0, "AudioDeviceAddIOProc: %d", (int)status
);
143 if(socketpair(PF_UNIX
, SOCK_STREAM
, 0, pfd
) < 0)
144 fatal(errno
, "error calling socketpair");
147 info("selected Core Audio backend");
150 /** @brief Core Audio deactivation */
151 static void coreaudio_deactivate(void) {
152 const OSStatus status
= AudioDeviceStop(adid
, adioproc
);
154 error(0, "AudioDeviceStop: %d", (int)status
);
155 device_state
= device_error
;
157 device_state
= device_closed
;
160 /** @brief Core Audio backend activation */
161 static void coreaudio_activate(void) {
162 const OSStatus status
= AudioDeviceStart(adid
, adioproc
);
165 error(0, "AudioDeviceStart: %d", (int)status
);
166 device_state
= device_error
;
168 device_state
= device_open
;
171 /** @brief Play via Core Audio */
172 static size_t coreaudio_play(size_t frames
) {
173 static size_t leftover
;
175 size_t bytes
= frames
* bpf
+ leftover
;
176 ssize_t bytes_written
;
179 /* There is a partial frame left over from an earlier write. Try
180 * and finish that off before doing anything else. */
182 bytes_written
= write(pfd
[1], playing
->buffer
+ playing
->start
, bytes
);
183 if(bytes_written
< 0)
185 case EINTR
: /* interrupted */
186 case EAGAIN
: /* buffer full */
187 return 0; /* try later */
189 fatal(errno
, "error writing to core audio player thread");
192 /* We were dealing the leftover bytes of a partial frame */
193 leftover
-= bytes_written
;
196 leftover
= bytes_written
% bpf
;
197 return bytes_written
/ bpf
;
200 /** @brief Fill in poll fd array for Core Audio */
201 static void coreaudio_beforepoll(int attribute((unused
)) *timeoutp
) {
202 pfd_slot
= addfd(pfd
[1], POLLOUT
);
205 /** @brief Process poll() results for Core Audio */
206 static int coreaudio_ready(void) {
207 return !!(fds
[pfd_slot
].revents
& (POLLOUT
|POLLERR
));
210 /** @brief Backend definition for Core Audio */
211 const struct speaker_backend coreaudio_backend
= {
217 coreaudio_deactivate
,
218 coreaudio_beforepoll
,