| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2009 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 lib/uaudio-coreaudio.c |
| 19 | * @brief Support for Core Audio backend */ |
| 20 | #include "common.h" |
| 21 | |
| 22 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 23 | |
| 24 | #include "coreaudio.h" |
| 25 | #include "uaudio.h" |
| 26 | #include "mem.h" |
| 27 | #include "log.h" |
| 28 | #include "syscalls.h" |
| 29 | #include "configuration.h" |
| 30 | |
| 31 | /** @brief Callback to request sample data */ |
| 32 | static uaudio_callback *coreaudio_callback; |
| 33 | |
| 34 | /** @brief Userdata for @ref coreaudio_callback */ |
| 35 | static void *coreaudio_userdata; |
| 36 | |
| 37 | /** @brief Core Audio device ID */ |
| 38 | static AudioDeviceID coreaudio_adid; |
| 39 | |
| 40 | /** @brief Core Audio option names */ |
| 41 | static const char *const coreaudio_options[] = { |
| 42 | "device", |
| 43 | NULL |
| 44 | }; |
| 45 | |
| 46 | /** @brief Callback from Core Audio |
| 47 | * |
| 48 | * Core Audio demands floating point samples but we provide integers. |
| 49 | * So there is a conversion step in here. |
| 50 | */ |
| 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; |
| 63 | |
| 64 | while(nbuffers > 0) { |
| 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); |
| 69 | |
| 70 | while(nsamples > 0) { |
| 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; |
| 76 | /* How many we get */ |
| 77 | int got; |
| 78 | |
| 79 | got = coreaudio_callback(input, ask, coreaudio_userdata); |
| 80 | /* Convert the samples and store in the output buffer */ |
| 81 | nsamples -= got; |
| 82 | if(uaudio_signed) { |
| 83 | if(uaudio_bits == 16) { |
| 84 | const int16_t *ptr = (int16_t *)input; |
| 85 | while(got > 0) { |
| 86 | --got; |
| 87 | *samples++ = *ptr++ * (0.5 / 32767); |
| 88 | } |
| 89 | } else { |
| 90 | const int8_t *ptr = (int8_t *)input; |
| 91 | while(got > 0) { |
| 92 | --got; |
| 93 | *samples++ = *ptr++ * (0.5 / 127); |
| 94 | } |
| 95 | } |
| 96 | } else { |
| 97 | if(uaudio_bits == 16) { |
| 98 | const uint16_t *ptr = (uint16_t *)input; |
| 99 | while(got > 0) { |
| 100 | --got; |
| 101 | *samples++ = ((int)*ptr++ - 32768) * (0.5 / 32767); |
| 102 | } |
| 103 | } else { |
| 104 | const uint8_t *ptr = (uint8_t *)input; |
| 105 | while(got > 0) { |
| 106 | --got; |
| 107 | *samples++ = ((int)*ptr++ - 128) * (0.5 / 127); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | /* Move on to the next buffer */ |
| 113 | ++ab; |
| 114 | --nbuffers; |
| 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static void coreaudio_start(uaudio_callback *callback, |
| 120 | void *userdata) { |
| 121 | OSStatus status; |
| 122 | UInt32 propertySize; |
| 123 | AudioStreamBasicDescription asbd; |
| 124 | const char *device; |
| 125 | |
| 126 | if(uaudio_bits != 8 && uaudio_bits != 16) |
| 127 | disorder_fatal(0, "asked for %d bits/channel but only support 8 and 16", |
| 128 | uaudio_bits); |
| 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); |
| 138 | if(status) |
| 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", |
| 156 | uaudio_rate, |
| 157 | uaudio_channels, |
| 158 | (double)asbd.mSampleRate, |
| 159 | (uint32_t)asbd.mChannelsPerFrame); |
| 160 | } |
| 161 | /* Add a collector callback */ |
| 162 | status = AudioDeviceAddIOProc(coreaudio_adid, coreaudio_adioproc, 0); |
| 163 | if(status) |
| 164 | coreaudio_fatal(status, "AudioDeviceAddIOProc"); |
| 165 | } |
| 166 | |
| 167 | static void coreaudio_stop(void) { |
| 168 | } |
| 169 | |
| 170 | static void coreaudio_activate(void) { |
| 171 | OSStatus status; |
| 172 | |
| 173 | status = AudioDeviceStart(coreaudio_adid, coreaudio_adioproc); |
| 174 | if(status) |
| 175 | coreaudio_fatal(status, "AudioDeviceStart"); |
| 176 | } |
| 177 | |
| 178 | static void coreaudio_deactivate(void) { |
| 179 | OSStatus status; |
| 180 | |
| 181 | status = AudioDeviceStop(coreaudio_adid, coreaudio_adioproc); |
| 182 | if(status) |
| 183 | coreaudio_fatal(status, "AudioDeviceStop"); |
| 184 | } |
| 185 | |
| 186 | static void coreaudio_configure(void) { |
| 187 | uaudio_set("device", config->device); |
| 188 | } |
| 189 | |
| 190 | const struct uaudio uaudio_coreaudio = { |
| 191 | .name = "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, |
| 198 | .flags = UAUDIO_API_CLIENT | UAUDIO_API_SERVER, |
| 199 | }; |
| 200 | |
| 201 | #endif |
| 202 | |
| 203 | /* |
| 204 | Local Variables: |
| 205 | c-basic-offset:2 |
| 206 | comment-column:40 |
| 207 | fill-column:79 |
| 208 | indent-tabs-mode:nil |
| 209 | End: |
| 210 | */ |