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937be4c0 RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2007 Richard Kettlewell | |
4 | * | |
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 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | /** @file server/speaker-coreaudio.c | |
21 | * @brief Support for @ref BACKEND_COREAUDIO | |
22 | * | |
23 | * Core Audio likes to make callbacks from a separate player thread | |
24 | * which then fill in the required number of bytes of audio. We fit | |
25 | * this into the existing architecture by means of a pipe between the | |
26 | * threads. | |
27 | * | |
28 | * We currently only support 16-bit 44100Hz stereo (and enforce this | |
29 | * in @ref lib/configuration.c.) There are some nasty bodges in this | |
30 | * code which depend on this and on further assumptions still... | |
31 | * | |
32 | * @todo support @ref config::device | |
33 | */ | |
34 | ||
35 | #include <config.h> | |
36 | ||
37 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H | |
38 | ||
39 | #include "types.h" | |
40 | ||
41 | #include <poll.h> | |
42 | #include <sys/socket.h> | |
43 | #include <unistd.h> | |
44 | #include <CoreAudio/AudioHardware.h> | |
45 | ||
46 | #include "configuration.h" | |
47 | #include "syscalls.h" | |
48 | #include "log.h" | |
49 | #include "speaker-protocol.h" | |
50 | #include "speaker.h" | |
51 | ||
52 | /** @brief Core Audio Device ID */ | |
53 | static AudioDeviceID adid; | |
54 | ||
55 | /** @brief Pipe between main and player threads | |
56 | * | |
57 | * We'll write samples to pfd[1] and read them from pfd[0]. | |
58 | */ | |
59 | static int pfd[2]; | |
60 | ||
61 | /** @brief Slot number in poll array */ | |
62 | static int pfd_slot; | |
63 | ||
64 | /** @brief Callback from Core Audio */ | |
65 | static OSStatus adioproc | |
66 | (AudioDeviceID attribute((unused)) inDevice, | |
67 | const AudioTimeStamp attribute((unused)) *inNow, | |
68 | const AudioBufferList attribute((unused)) *inInputData, | |
69 | const AudioTimeStamp attribute((unused)) *inInputTime, | |
70 | AudioBufferList *outOutputData, | |
71 | const AudioTimeStamp attribute((unused)) *inOutputTime, | |
72 | void attribute((unused)) *inClientData) { | |
73 | UInt32 nbuffers = outOutputData->mNumberBuffers; | |
74 | AudioBuffer *ab = outOutputData->mBuffers; | |
75 | ||
76 | while(nbuffers > 0) { | |
77 | float *samplesOut = ab->mData; | |
78 | size_t samplesOutLeft = ab->mDataByteSize / sizeof (float); | |
79 | int16_t input[1024], *ptr; | |
80 | size_t bytes; | |
81 | ssize_t bytes_read; | |
82 | size_t samples; | |
83 | ||
84 | while(samplesOutLeft > 0) { | |
85 | /* Read some more data */ | |
86 | bytes = samplesOutLeft * sizeof (int16_t); | |
87 | if(bytes > sizeof input) | |
88 | bytes = sizeof input; | |
89 | ||
90 | bytes_read = read(pfd[0], input, bytes); | |
91 | if(bytes_read < 0) | |
92 | switch(errno) { | |
93 | case EINTR: | |
94 | continue; /* just try again */ | |
95 | case EAGAIN: | |
96 | return 0; /* underrun - just play 0s */ | |
97 | default: | |
98 | fatal(errno, "read error in core audio thread"); | |
99 | } | |
100 | assert(bytes_read % 4 == 0); /* TODO horrible bodge! */ | |
101 | samples = bytes_read / sizeof (int16_t); | |
102 | assert(samples <= samplesOutLeft); | |
103 | ptr = input; | |
104 | samplesOutLeft -= samples; | |
105 | while(samples-- > 0) | |
106 | *samplesOut++ = *ptr++ * (0.5 / 32767); | |
107 | } | |
108 | ++ab; | |
109 | --nbuffers; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /** @brief Core Audio backend initialization */ | |
115 | static void coreaudio_init(void) { | |
116 | OSStatus status; | |
117 | UInt32 propertySize; | |
118 | AudioStreamBasicDescription asbd; | |
119 | ||
120 | propertySize = sizeof adid; | |
121 | status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, | |
122 | &propertySize, &adid); | |
123 | if(status) | |
124 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); | |
125 | if(adid == kAudioDeviceUnknown) | |
126 | fatal(0, "no output device"); | |
127 | propertySize = sizeof asbd; | |
128 | status = AudioDeviceGetProperty(adid, 0, false, | |
129 | kAudioDevicePropertyStreamFormat, | |
130 | &propertySize, &asbd); | |
131 | if(status) | |
132 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); | |
133 | D(("mSampleRate %f", asbd.mSampleRate)); | |
134 | D(("mFormatID %08lx", asbd.mFormatID)); | |
135 | D(("mFormatFlags %08lx", asbd.mFormatFlags)); | |
136 | D(("mBytesPerPacket %08lx", asbd.mBytesPerPacket)); | |
137 | D(("mFramesPerPacket %08lx", asbd.mFramesPerPacket)); | |
138 | D(("mBytesPerFrame %08lx", asbd.mBytesPerFrame)); | |
139 | D(("mChannelsPerFrame %08lx", asbd.mChannelsPerFrame)); | |
140 | D(("mBitsPerChannel %08lx", asbd.mBitsPerChannel)); | |
141 | D(("mReserved %08lx", asbd.mReserved)); | |
142 | if(asbd.mFormatID != kAudioFormatLinearPCM) | |
143 | fatal(0, "audio device does not support kAudioFormatLinearPCM"); | |
144 | status = AudioDeviceAddIOProc(adid, adioproc, 0); | |
145 | if(status) | |
146 | fatal(0, "AudioDeviceAddIOProc: %d", (int)status); | |
147 | if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfd) < 0) | |
148 | fatal(errno, "error calling socketpair"); | |
149 | nonblock(pfd[0]); | |
150 | nonblock(pfd[1]); | |
151 | info("selected Core Audio backend"); | |
152 | } | |
153 | ||
154 | /** @brief Core Audio deactivation */ | |
155 | static void coreaudio_deactivate(void) { | |
156 | const OSStatus status = AudioDeviceStop(adid, adioproc); | |
157 | if(status) { | |
158 | error(0, "AudioDeviceStop: %d", (int)status); | |
159 | device_state = device_error; | |
160 | } else | |
161 | device_state = device_closed; | |
162 | } | |
163 | ||
164 | /** @brief Core Audio backend activation */ | |
165 | static void coreaudio_activate(void) { | |
166 | const OSStatus status = AudioDeviceStart(adid, adioproc); | |
167 | ||
168 | if(status) { | |
169 | error(0, "AudioDeviceStart: %d", (int)status); | |
170 | device_state = device_error; | |
171 | } | |
172 | device_state = device_open; | |
173 | } | |
174 | ||
175 | /** @brief Play via Core Audio */ | |
176 | static size_t coreaudio_play(size_t frames) { | |
177 | static size_t leftover; | |
178 | ||
179 | size_t bytes = frames * bpf + leftover; | |
180 | ssize_t bytes_written; | |
181 | ||
182 | if(leftover) | |
183 | /* There is a partial frame left over from an earlier write. Try | |
184 | * and finish that off before doing anything else. */ | |
185 | bytes = leftover; | |
186 | bytes_written = write(pfd[1], playing->buffer + playing->start, bytes); | |
187 | if(bytes_written < 0) | |
188 | switch(errno) { | |
189 | case EINTR: /* interrupted */ | |
190 | case EAGAIN: /* buffer full */ | |
191 | return 0; /* try later */ | |
192 | default: | |
193 | fatal(errno, "error writing to core audio player thread"); | |
194 | } | |
195 | if(leftover) { | |
196 | /* We were dealing the leftover bytes of a partial frame */ | |
197 | leftover -= bytes_written; | |
198 | return !leftover; | |
199 | } | |
200 | leftover = bytes_written % bpf; | |
201 | return bytes_written / bpf; | |
202 | } | |
203 | ||
204 | /** @brief Fill in poll fd array for Core Audio */ | |
205 | static void coreaudio_beforepoll(void) { | |
206 | pfd_slot = addfd(pfd[1], POLLOUT); | |
207 | } | |
208 | ||
209 | /** @brief Process poll() results for Core Audio */ | |
210 | static int coreaudio_ready(void) { | |
211 | return !!(fds[pfd_slot].revents & (POLLOUT|POLLERR)); | |
212 | } | |
213 | ||
214 | /** @brief Backend definition for Core Audio */ | |
215 | const struct speaker_backend coreaudio_backend = { | |
216 | BACKEND_COREAUDIO, | |
217 | 0, | |
218 | coreaudio_init, | |
219 | coreaudio_activate, | |
220 | coreaudio_play, | |
221 | coreaudio_deactivate, | |
222 | coreaudio_beforepoll, | |
223 | coreaudio_ready | |
224 | }; | |
225 | ||
226 | #endif | |
227 | ||
228 | /* | |
229 | Local Variables: | |
230 | c-basic-offset:2 | |
231 | comment-column:40 | |
232 | fill-column:79 | |
233 | indent-tabs-mode:nil | |
234 | End: | |
235 | */ |