| 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 3 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, |
| 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. |
| 14 | * |
| 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/>. |
| 17 | */ |
| 18 | /** @file server/speaker-coreaudio.c |
| 19 | * @brief Support for @ref BACKEND_COREAUDIO |
| 20 | * |
| 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 |
| 24 | * threads. |
| 25 | * |
| 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... |
| 29 | * |
| 30 | * @todo support @ref config::device |
| 31 | */ |
| 32 | |
| 33 | #include "common.h" |
| 34 | |
| 35 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 36 | |
| 37 | #include <poll.h> |
| 38 | #include <sys/socket.h> |
| 39 | #include <unistd.h> |
| 40 | #include <CoreAudio/AudioHardware.h> |
| 41 | |
| 42 | #include "configuration.h" |
| 43 | #include "syscalls.h" |
| 44 | #include "log.h" |
| 45 | #include "speaker-protocol.h" |
| 46 | #include "speaker.h" |
| 47 | |
| 48 | /** @brief Core Audio Device ID */ |
| 49 | static AudioDeviceID adid; |
| 50 | |
| 51 | /** @brief Pipe between main and player threads |
| 52 | * |
| 53 | * We'll write samples to pfd[1] and read them from pfd[0]. |
| 54 | */ |
| 55 | static int pfd[2]; |
| 56 | |
| 57 | /** @brief Slot number in poll array */ |
| 58 | static int pfd_slot; |
| 59 | |
| 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; |
| 71 | |
| 72 | while(nbuffers > 0) { |
| 73 | float *samplesOut = ab->mData; |
| 74 | size_t samplesOutLeft = ab->mDataByteSize / sizeof (float); |
| 75 | int16_t input[1024], *ptr; |
| 76 | size_t bytes; |
| 77 | ssize_t bytes_read; |
| 78 | size_t samples; |
| 79 | |
| 80 | while(samplesOutLeft > 0) { |
| 81 | /* Read some more data */ |
| 82 | bytes = samplesOutLeft * sizeof (int16_t); |
| 83 | if(bytes > sizeof input) |
| 84 | bytes = sizeof input; |
| 85 | |
| 86 | bytes_read = read(pfd[0], input, bytes); |
| 87 | if(bytes_read < 0) |
| 88 | switch(errno) { |
| 89 | case EINTR: |
| 90 | continue; /* just try again */ |
| 91 | case EAGAIN: |
| 92 | return 0; /* underrun - just play 0s */ |
| 93 | default: |
| 94 | fatal(errno, "read error in core audio thread"); |
| 95 | } |
| 96 | assert(bytes_read % 4 == 0); /* TODO horrible bodge! */ |
| 97 | samples = bytes_read / sizeof (int16_t); |
| 98 | assert(samples <= samplesOutLeft); |
| 99 | ptr = input; |
| 100 | samplesOutLeft -= samples; |
| 101 | while(samples-- > 0) |
| 102 | *samplesOut++ = *ptr++ * (0.5 / 32767); |
| 103 | } |
| 104 | ++ab; |
| 105 | --nbuffers; |
| 106 | } |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | /** @brief Core Audio backend initialization */ |
| 111 | static void coreaudio_init(void) { |
| 112 | OSStatus status; |
| 113 | UInt32 propertySize; |
| 114 | AudioStreamBasicDescription asbd; |
| 115 | |
| 116 | propertySize = sizeof adid; |
| 117 | status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, |
| 118 | &propertySize, &adid); |
| 119 | if(status) |
| 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); |
| 127 | if(status) |
| 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); |
| 141 | if(status) |
| 142 | fatal(0, "AudioDeviceAddIOProc: %d", (int)status); |
| 143 | if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfd) < 0) |
| 144 | fatal(errno, "error calling socketpair"); |
| 145 | nonblock(pfd[0]); |
| 146 | nonblock(pfd[1]); |
| 147 | info("selected Core Audio backend"); |
| 148 | } |
| 149 | |
| 150 | /** @brief Core Audio deactivation */ |
| 151 | static void coreaudio_deactivate(void) { |
| 152 | const OSStatus status = AudioDeviceStop(adid, adioproc); |
| 153 | if(status) { |
| 154 | error(0, "AudioDeviceStop: %d", (int)status); |
| 155 | device_state = device_error; |
| 156 | } else |
| 157 | device_state = device_closed; |
| 158 | } |
| 159 | |
| 160 | /** @brief Core Audio backend activation */ |
| 161 | static void coreaudio_activate(void) { |
| 162 | const OSStatus status = AudioDeviceStart(adid, adioproc); |
| 163 | |
| 164 | if(status) { |
| 165 | error(0, "AudioDeviceStart: %d", (int)status); |
| 166 | device_state = device_error; |
| 167 | } |
| 168 | device_state = device_open; |
| 169 | } |
| 170 | |
| 171 | /** @brief Play via Core Audio */ |
| 172 | static size_t coreaudio_play(size_t frames) { |
| 173 | static size_t leftover; |
| 174 | |
| 175 | size_t bytes = frames * bpf + leftover; |
| 176 | ssize_t bytes_written; |
| 177 | |
| 178 | if(leftover) |
| 179 | /* There is a partial frame left over from an earlier write. Try |
| 180 | * and finish that off before doing anything else. */ |
| 181 | bytes = leftover; |
| 182 | bytes_written = write(pfd[1], playing->buffer + playing->start, bytes); |
| 183 | if(bytes_written < 0) |
| 184 | switch(errno) { |
| 185 | case EINTR: /* interrupted */ |
| 186 | case EAGAIN: /* buffer full */ |
| 187 | return 0; /* try later */ |
| 188 | default: |
| 189 | fatal(errno, "error writing to core audio player thread"); |
| 190 | } |
| 191 | if(leftover) { |
| 192 | /* We were dealing the leftover bytes of a partial frame */ |
| 193 | leftover -= bytes_written; |
| 194 | return !leftover; |
| 195 | } |
| 196 | leftover = bytes_written % bpf; |
| 197 | return bytes_written / bpf; |
| 198 | } |
| 199 | |
| 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); |
| 203 | } |
| 204 | |
| 205 | /** @brief Process poll() results for Core Audio */ |
| 206 | static int coreaudio_ready(void) { |
| 207 | return !!(fds[pfd_slot].revents & (POLLOUT|POLLERR)); |
| 208 | } |
| 209 | |
| 210 | /** @brief Backend definition for Core Audio */ |
| 211 | const struct speaker_backend coreaudio_backend = { |
| 212 | BACKEND_COREAUDIO, |
| 213 | 0, |
| 214 | coreaudio_init, |
| 215 | coreaudio_activate, |
| 216 | coreaudio_play, |
| 217 | coreaudio_deactivate, |
| 218 | coreaudio_beforepoll, |
| 219 | coreaudio_ready |
| 220 | }; |
| 221 | |
| 222 | #endif |
| 223 | |
| 224 | /* |
| 225 | Local Variables: |
| 226 | c-basic-offset:2 |
| 227 | comment-column:40 |
| 228 | fill-column:79 |
| 229 | indent-tabs-mode:nil |
| 230 | End: |
| 231 | */ |