1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/Alc/backends/coreaudio.c	Tue Oct 25 13:02:31 2011 -0700
     1.3 @@ -0,0 +1,719 @@
     1.4 +/**
     1.5 + * OpenAL cross platform audio library
     1.6 + * Copyright (C) 1999-2007 by authors.
     1.7 + * This library is free software; you can redistribute it and/or
     1.8 + *  modify it under the terms of the GNU Library General Public
     1.9 + *  License as published by the Free Software Foundation; either
    1.10 + *  version 2 of the License, or (at your option) any later version.
    1.11 + *
    1.12 + * This library is distributed in the hope that it will be useful,
    1.13 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.14 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    1.15 + *  Library General Public License for more details.
    1.16 + *
    1.17 + * You should have received a copy of the GNU Library General Public
    1.18 + *  License along with this library; if not, write to the
    1.19 + *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    1.20 + *  Boston, MA  02111-1307, USA.
    1.21 + * Or go to http://www.gnu.org/copyleft/lgpl.html
    1.22 + */
    1.23 +
    1.24 +#include "config.h"
    1.25 +
    1.26 +#include <stdio.h>
    1.27 +#include <stdlib.h>
    1.28 +#include <string.h>
    1.29 +
    1.30 +#include "alMain.h"
    1.31 +#include "AL/al.h"
    1.32 +#include "AL/alc.h"
    1.33 +
    1.34 +#include <CoreServices/CoreServices.h>
    1.35 +#include <unistd.h>
    1.36 +#include <AudioUnit/AudioUnit.h>
    1.37 +#include <AudioToolbox/AudioToolbox.h>
    1.38 +
    1.39 +
    1.40 +typedef struct {
    1.41 +    AudioUnit audioUnit;
    1.42 +
    1.43 +    ALuint frameSize;
    1.44 +    ALdouble sampleRateRatio;              // Ratio of hardware sample rate / requested sample rate
    1.45 +    AudioStreamBasicDescription format;    // This is the OpenAL format as a CoreAudio ASBD
    1.46 +
    1.47 +    AudioConverterRef audioConverter;      // Sample rate converter if needed
    1.48 +    AudioBufferList *bufferList;           // Buffer for data coming from the input device
    1.49 +    ALCvoid *resampleBuffer;               // Buffer for returned RingBuffer data when resampling
    1.50 +
    1.51 +    RingBuffer *ring;
    1.52 +} ca_data;
    1.53 +
    1.54 +static const ALCchar ca_device[] = "CoreAudio Default";
    1.55 +
    1.56 +
    1.57 +static void destroy_buffer_list(AudioBufferList* list)
    1.58 +{
    1.59 +    if(list)
    1.60 +    {
    1.61 +        UInt32 i;
    1.62 +        for(i = 0;i < list->mNumberBuffers;i++)
    1.63 +            free(list->mBuffers[i].mData);
    1.64 +        free(list);
    1.65 +    }
    1.66 +}
    1.67 +
    1.68 +static AudioBufferList* allocate_buffer_list(UInt32 channelCount, UInt32 byteSize)
    1.69 +{
    1.70 +    AudioBufferList *list;
    1.71 +
    1.72 +    list = calloc(1, sizeof(AudioBufferList) + sizeof(AudioBuffer));
    1.73 +    if(list)
    1.74 +    {
    1.75 +        list->mNumberBuffers = 1;
    1.76 +
    1.77 +        list->mBuffers[0].mNumberChannels = channelCount;
    1.78 +        list->mBuffers[0].mDataByteSize = byteSize;
    1.79 +        list->mBuffers[0].mData = malloc(byteSize);
    1.80 +        if(list->mBuffers[0].mData == NULL)
    1.81 +        {
    1.82 +            free(list);
    1.83 +            list = NULL;
    1.84 +        }
    1.85 +    }
    1.86 +    return list;
    1.87 +}
    1.88 +
    1.89 +static OSStatus ca_callback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp,
    1.90 +                            UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData)
    1.91 +{
    1.92 +    ALCdevice *device = (ALCdevice*)inRefCon;
    1.93 +    ca_data *data = (ca_data*)device->ExtraData;
    1.94 +
    1.95 +    aluMixData(device, ioData->mBuffers[0].mData,
    1.96 +               ioData->mBuffers[0].mDataByteSize / data->frameSize);
    1.97 +
    1.98 +    return noErr;
    1.99 +}
   1.100 +
   1.101 +static OSStatus ca_capture_conversion_callback(AudioConverterRef inAudioConverter, UInt32 *ioNumberDataPackets,
   1.102 +        AudioBufferList *ioData, AudioStreamPacketDescription **outDataPacketDescription, void* inUserData)
   1.103 +{
   1.104 +    ALCdevice *device = (ALCdevice*)inUserData;
   1.105 +    ca_data *data = (ca_data*)device->ExtraData;
   1.106 +
   1.107 +    // Read from the ring buffer and store temporarily in a large buffer
   1.108 +    ReadRingBuffer(data->ring, data->resampleBuffer, (ALsizei)(*ioNumberDataPackets));
   1.109 +
   1.110 +    // Set the input data
   1.111 +    ioData->mNumberBuffers = 1;
   1.112 +    ioData->mBuffers[0].mNumberChannels = data->format.mChannelsPerFrame;
   1.113 +    ioData->mBuffers[0].mData = data->resampleBuffer;
   1.114 +    ioData->mBuffers[0].mDataByteSize = (*ioNumberDataPackets) * data->format.mBytesPerFrame;
   1.115 +
   1.116 +    return noErr;
   1.117 +}
   1.118 +
   1.119 +static OSStatus ca_capture_callback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags,
   1.120 +                                    const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber,
   1.121 +                                    UInt32 inNumberFrames, AudioBufferList *ioData)
   1.122 +{
   1.123 +    ALCdevice *device = (ALCdevice*)inRefCon;
   1.124 +    ca_data *data = (ca_data*)device->ExtraData;
   1.125 +    AudioUnitRenderActionFlags flags = 0;
   1.126 +    OSStatus err;
   1.127 +
   1.128 +    // fill the bufferList with data from the input device
   1.129 +    err = AudioUnitRender(data->audioUnit, &flags, inTimeStamp, 1, inNumberFrames, data->bufferList);
   1.130 +    if(err != noErr)
   1.131 +    {
   1.132 +        ERR("AudioUnitRender error: %d\n", err);
   1.133 +        return err;
   1.134 +    }
   1.135 +
   1.136 +    WriteRingBuffer(data->ring, data->bufferList->mBuffers[0].mData, inNumberFrames);
   1.137 +
   1.138 +    return noErr;
   1.139 +}
   1.140 +
   1.141 +static ALCboolean ca_open_playback(ALCdevice *device, const ALCchar *deviceName)
   1.142 +{
   1.143 +    ComponentDescription desc;
   1.144 +    Component comp;
   1.145 +    ca_data *data;
   1.146 +    OSStatus err;
   1.147 +
   1.148 +    if(!deviceName)
   1.149 +        deviceName = ca_device;
   1.150 +    else if(strcmp(deviceName, ca_device) != 0)
   1.151 +        return ALC_FALSE;
   1.152 +
   1.153 +    /* open the default output unit */
   1.154 +    desc.componentType = kAudioUnitType_Output;
   1.155 +    desc.componentSubType = kAudioUnitSubType_DefaultOutput;
   1.156 +    desc.componentManufacturer = kAudioUnitManufacturer_Apple;
   1.157 +    desc.componentFlags = 0;
   1.158 +    desc.componentFlagsMask = 0;
   1.159 +
   1.160 +    comp = FindNextComponent(NULL, &desc);
   1.161 +    if(comp == NULL)
   1.162 +    {
   1.163 +        ERR("FindNextComponent failed\n");
   1.164 +        return ALC_FALSE;
   1.165 +    }
   1.166 +
   1.167 +    data = calloc(1, sizeof(*data));
   1.168 +    device->ExtraData = data;
   1.169 +
   1.170 +    err = OpenAComponent(comp, &data->audioUnit);
   1.171 +    if(err != noErr)
   1.172 +    {
   1.173 +        ERR("OpenAComponent failed\n");
   1.174 +        free(data);
   1.175 +        device->ExtraData = NULL;
   1.176 +        return ALC_FALSE;
   1.177 +    }
   1.178 +
   1.179 +    return ALC_TRUE;
   1.180 +}
   1.181 +
   1.182 +static void ca_close_playback(ALCdevice *device)
   1.183 +{
   1.184 +    ca_data *data = (ca_data*)device->ExtraData;
   1.185 +
   1.186 +    CloseComponent(data->audioUnit);
   1.187 +
   1.188 +    free(data);
   1.189 +    device->ExtraData = NULL;
   1.190 +}
   1.191 +
   1.192 +static ALCboolean ca_reset_playback(ALCdevice *device)
   1.193 +{
   1.194 +    ca_data *data = (ca_data*)device->ExtraData;
   1.195 +    AudioStreamBasicDescription streamFormat;
   1.196 +    AURenderCallbackStruct input;
   1.197 +    OSStatus err;
   1.198 +    UInt32 size;
   1.199 +
   1.200 +    /* init and start the default audio unit... */
   1.201 +    err = AudioUnitInitialize(data->audioUnit);
   1.202 +    if(err != noErr)
   1.203 +    {
   1.204 +        ERR("AudioUnitInitialize failed\n");
   1.205 +        return ALC_FALSE;
   1.206 +    }
   1.207 +
   1.208 +    err = AudioOutputUnitStart(data->audioUnit);
   1.209 +    if(err != noErr)
   1.210 +    {
   1.211 +        ERR("AudioOutputUnitStart failed\n");
   1.212 +        return ALC_FALSE;
   1.213 +    }
   1.214 +
   1.215 +    /* retrieve default output unit's properties (output side) */
   1.216 +    size = sizeof(AudioStreamBasicDescription);
   1.217 +    err = AudioUnitGetProperty(data->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &streamFormat, &size);
   1.218 +    if(err != noErr || size != sizeof(AudioStreamBasicDescription))
   1.219 +    {
   1.220 +        ERR("AudioUnitGetProperty failed\n");
   1.221 +        return ALC_FALSE;
   1.222 +    }
   1.223 +
   1.224 +#if 0
   1.225 +    TRACE("Output streamFormat of default output unit -\n");
   1.226 +    TRACE("  streamFormat.mFramesPerPacket = %d\n", streamFormat.mFramesPerPacket);
   1.227 +    TRACE("  streamFormat.mChannelsPerFrame = %d\n", streamFormat.mChannelsPerFrame);
   1.228 +    TRACE("  streamFormat.mBitsPerChannel = %d\n", streamFormat.mBitsPerChannel);
   1.229 +    TRACE("  streamFormat.mBytesPerPacket = %d\n", streamFormat.mBytesPerPacket);
   1.230 +    TRACE("  streamFormat.mBytesPerFrame = %d\n", streamFormat.mBytesPerFrame);
   1.231 +    TRACE("  streamFormat.mSampleRate = %5.0f\n", streamFormat.mSampleRate);
   1.232 +#endif
   1.233 +
   1.234 +    /* set default output unit's input side to match output side */
   1.235 +    err = AudioUnitSetProperty(data->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &streamFormat, size);
   1.236 +    if(err != noErr)
   1.237 +    {
   1.238 +        ERR("AudioUnitSetProperty failed\n");
   1.239 +        return ALC_FALSE;
   1.240 +    }
   1.241 +
   1.242 +    if(device->Frequency != streamFormat.mSampleRate)
   1.243 +    {
   1.244 +        if((device->Flags&DEVICE_FREQUENCY_REQUEST))
   1.245 +            ERR("CoreAudio does not support changing sample rates (wanted %dhz, got %dhz)\n", device->Frequency, streamFormat.mSampleRate);
   1.246 +        device->Flags &= ~DEVICE_FREQUENCY_REQUEST;
   1.247 +
   1.248 +        device->UpdateSize = (ALuint)((ALuint64)device->UpdateSize *
   1.249 +                                      streamFormat.mSampleRate /
   1.250 +                                      device->Frequency);
   1.251 +        device->Frequency = streamFormat.mSampleRate;
   1.252 +    }
   1.253 +
   1.254 +    /* FIXME: How to tell what channels are what in the output device, and how
   1.255 +     * to specify what we're giving?  eg, 6.0 vs 5.1 */
   1.256 +    switch(streamFormat.mChannelsPerFrame)
   1.257 +    {
   1.258 +        case 1:
   1.259 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.260 +               device->FmtChans != DevFmtMono)
   1.261 +            {
   1.262 +                ERR("Failed to set %s, got Mono instead\n", DevFmtChannelsString(device->FmtChans));
   1.263 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.264 +            }
   1.265 +            device->FmtChans = DevFmtMono;
   1.266 +            break;
   1.267 +        case 2:
   1.268 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.269 +               device->FmtChans != DevFmtStereo)
   1.270 +            {
   1.271 +                ERR("Failed to set %s, got Stereo instead\n", DevFmtChannelsString(device->FmtChans));
   1.272 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.273 +            }
   1.274 +            device->FmtChans = DevFmtStereo;
   1.275 +            break;
   1.276 +        case 4:
   1.277 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.278 +               device->FmtChans != DevFmtQuad)
   1.279 +            {
   1.280 +                ERR("Failed to set %s, got Quad instead\n", DevFmtChannelsString(device->FmtChans));
   1.281 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.282 +            }
   1.283 +            device->FmtChans = DevFmtQuad;
   1.284 +            break;
   1.285 +        case 6:
   1.286 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.287 +               device->FmtChans != DevFmtX51)
   1.288 +            {
   1.289 +                ERR("Failed to set %s, got 5.1 Surround instead\n", DevFmtChannelsString(device->FmtChans));
   1.290 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.291 +            }
   1.292 +            device->FmtChans = DevFmtX51;
   1.293 +            break;
   1.294 +        case 7:
   1.295 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.296 +               device->FmtChans != DevFmtX61)
   1.297 +            {
   1.298 +                ERR("Failed to set %s, got 6.1 Surround instead\n", DevFmtChannelsString(device->FmtChans));
   1.299 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.300 +            }
   1.301 +            device->FmtChans = DevFmtX61;
   1.302 +            break;
   1.303 +        case 8:
   1.304 +            if((device->Flags&DEVICE_CHANNELS_REQUEST) &&
   1.305 +               device->FmtChans != DevFmtX71)
   1.306 +            {
   1.307 +                ERR("Failed to set %s, got 7.1 Surround instead\n", DevFmtChannelsString(device->FmtChans));
   1.308 +                device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.309 +            }
   1.310 +            device->FmtChans = DevFmtX71;
   1.311 +            break;
   1.312 +        default:
   1.313 +            ERR("Unhandled channel count (%d), using Stereo\n", streamFormat.mChannelsPerFrame);
   1.314 +            device->Flags &= ~DEVICE_CHANNELS_REQUEST;
   1.315 +            device->FmtChans = DevFmtStereo;
   1.316 +            streamFormat.mChannelsPerFrame = 2;
   1.317 +            break;
   1.318 +    }
   1.319 +    SetDefaultWFXChannelOrder(device);
   1.320 +
   1.321 +    /* use channel count and sample rate from the default output unit's current
   1.322 +     * parameters, but reset everything else */
   1.323 +    streamFormat.mFramesPerPacket = 1;
   1.324 +    switch(device->FmtType)
   1.325 +    {
   1.326 +        case DevFmtUByte:
   1.327 +            device->FmtType = DevFmtByte;
   1.328 +            /* fall-through */
   1.329 +        case DevFmtByte:
   1.330 +            streamFormat.mBitsPerChannel = 8;
   1.331 +            streamFormat.mBytesPerPacket = streamFormat.mChannelsPerFrame;
   1.332 +            streamFormat.mBytesPerFrame = streamFormat.mChannelsPerFrame;
   1.333 +            break;
   1.334 +        case DevFmtUShort:
   1.335 +        case DevFmtFloat:
   1.336 +            device->FmtType = DevFmtShort;
   1.337 +            /* fall-through */
   1.338 +        case DevFmtShort:
   1.339 +            streamFormat.mBitsPerChannel = 16;
   1.340 +            streamFormat.mBytesPerPacket = 2 * streamFormat.mChannelsPerFrame;
   1.341 +            streamFormat.mBytesPerFrame = 2 * streamFormat.mChannelsPerFrame;
   1.342 +            break;
   1.343 +    }
   1.344 +    streamFormat.mFormatID = kAudioFormatLinearPCM;
   1.345 +    streamFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger |
   1.346 +                                kAudioFormatFlagsNativeEndian |
   1.347 +                                kLinearPCMFormatFlagIsPacked;
   1.348 +
   1.349 +    err = AudioUnitSetProperty(data->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &streamFormat, sizeof(AudioStreamBasicDescription));
   1.350 +    if(err != noErr)
   1.351 +    {
   1.352 +        ERR("AudioUnitSetProperty failed\n");
   1.353 +        return ALC_FALSE;
   1.354 +    }
   1.355 +
   1.356 +    /* setup callback */
   1.357 +    data->frameSize = FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
   1.358 +    input.inputProc = ca_callback;
   1.359 +    input.inputProcRefCon = device;
   1.360 +
   1.361 +    err = AudioUnitSetProperty(data->audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &input, sizeof(AURenderCallbackStruct));
   1.362 +    if(err != noErr)
   1.363 +    {
   1.364 +        ERR("AudioUnitSetProperty failed\n");
   1.365 +        return ALC_FALSE;
   1.366 +    }
   1.367 +
   1.368 +    return ALC_TRUE;
   1.369 +}
   1.370 +
   1.371 +static void ca_stop_playback(ALCdevice *device)
   1.372 +{
   1.373 +    ca_data *data = (ca_data*)device->ExtraData;
   1.374 +    OSStatus err;
   1.375 +
   1.376 +    AudioOutputUnitStop(data->audioUnit);
   1.377 +    err = AudioUnitUninitialize(data->audioUnit);
   1.378 +    if(err != noErr)
   1.379 +        ERR("-- AudioUnitUninitialize failed.\n");
   1.380 +}
   1.381 +
   1.382 +static ALCboolean ca_open_capture(ALCdevice *device, const ALCchar *deviceName)
   1.383 +{
   1.384 +    AudioStreamBasicDescription requestedFormat;  // The application requested format
   1.385 +    AudioStreamBasicDescription hardwareFormat;   // The hardware format
   1.386 +    AudioStreamBasicDescription outputFormat;     // The AudioUnit output format
   1.387 +    AURenderCallbackStruct input;
   1.388 +    ComponentDescription desc;
   1.389 +    AudioDeviceID inputDevice;
   1.390 +    UInt32 outputFrameCount;
   1.391 +    UInt32 propertySize;
   1.392 +    UInt32 enableIO;
   1.393 +    Component comp;
   1.394 +    ca_data *data;
   1.395 +    OSStatus err;
   1.396 +
   1.397 +    desc.componentType = kAudioUnitType_Output;
   1.398 +    desc.componentSubType = kAudioUnitSubType_HALOutput;
   1.399 +    desc.componentManufacturer = kAudioUnitManufacturer_Apple;
   1.400 +    desc.componentFlags = 0;
   1.401 +    desc.componentFlagsMask = 0;
   1.402 +
   1.403 +    // Search for component with given description
   1.404 +    comp = FindNextComponent(NULL, &desc);
   1.405 +    if(comp == NULL)
   1.406 +    {
   1.407 +        ERR("FindNextComponent failed\n");
   1.408 +        return ALC_FALSE;
   1.409 +    }
   1.410 +
   1.411 +    data = calloc(1, sizeof(*data));
   1.412 +    device->ExtraData = data;
   1.413 +
   1.414 +    // Open the component
   1.415 +    err = OpenAComponent(comp, &data->audioUnit);
   1.416 +    if(err != noErr)
   1.417 +    {
   1.418 +        ERR("OpenAComponent failed\n");
   1.419 +        goto error;
   1.420 +    }
   1.421 +
   1.422 +    // Turn off AudioUnit output
   1.423 +    enableIO = 0;
   1.424 +    err = AudioUnitSetProperty(data->audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, 0, &enableIO, sizeof(ALuint));
   1.425 +    if(err != noErr)
   1.426 +    {
   1.427 +        ERR("AudioUnitSetProperty failed\n");
   1.428 +        goto error;
   1.429 +    }
   1.430 +
   1.431 +    // Turn on AudioUnit input
   1.432 +    enableIO = 1;
   1.433 +    err = AudioUnitSetProperty(data->audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &enableIO, sizeof(ALuint));
   1.434 +    if(err != noErr)
   1.435 +    {
   1.436 +        ERR("AudioUnitSetProperty failed\n");
   1.437 +        goto error;
   1.438 +    }
   1.439 +
   1.440 +    // Get the default input device
   1.441 +    propertySize = sizeof(AudioDeviceID);
   1.442 +    err = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice, &propertySize, &inputDevice);
   1.443 +    if(err != noErr)
   1.444 +    {
   1.445 +        ERR("AudioHardwareGetProperty failed\n");
   1.446 +        goto error;
   1.447 +    }
   1.448 +
   1.449 +    if(inputDevice == kAudioDeviceUnknown)
   1.450 +    {
   1.451 +        ERR("No input device found\n");
   1.452 +        goto error;
   1.453 +    }
   1.454 +
   1.455 +    // Track the input device
   1.456 +    err = AudioUnitSetProperty(data->audioUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &inputDevice, sizeof(AudioDeviceID));
   1.457 +    if(err != noErr)
   1.458 +    {
   1.459 +        ERR("AudioUnitSetProperty failed\n");
   1.460 +        goto error;
   1.461 +    }
   1.462 +
   1.463 +    // set capture callback
   1.464 +    input.inputProc = ca_capture_callback;
   1.465 +    input.inputProcRefCon = device;
   1.466 +
   1.467 +    err = AudioUnitSetProperty(data->audioUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, 0, &input, sizeof(AURenderCallbackStruct));
   1.468 +    if(err != noErr)
   1.469 +    {
   1.470 +        ERR("AudioUnitSetProperty failed\n");
   1.471 +        goto error;
   1.472 +    }
   1.473 +
   1.474 +    // Initialize the device
   1.475 +    err = AudioUnitInitialize(data->audioUnit);
   1.476 +    if(err != noErr)
   1.477 +    {
   1.478 +        ERR("AudioUnitInitialize failed\n");
   1.479 +        goto error;
   1.480 +    }
   1.481 +
   1.482 +    // Get the hardware format
   1.483 +    propertySize = sizeof(AudioStreamBasicDescription);
   1.484 +    err = AudioUnitGetProperty(data->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 1, &hardwareFormat, &propertySize);
   1.485 +    if(err != noErr || propertySize != sizeof(AudioStreamBasicDescription))
   1.486 +    {
   1.487 +        ERR("AudioUnitGetProperty failed\n");
   1.488 +        goto error;
   1.489 +    }
   1.490 +
   1.491 +    // Set up the requested format description
   1.492 +    switch(device->FmtType)
   1.493 +    {
   1.494 +        case DevFmtUByte:
   1.495 +            requestedFormat.mBitsPerChannel = 8;
   1.496 +            requestedFormat.mFormatFlags = kAudioFormatFlagIsPacked;
   1.497 +            break;
   1.498 +        case DevFmtShort:
   1.499 +            requestedFormat.mBitsPerChannel = 16;
   1.500 +            requestedFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked;
   1.501 +            break;
   1.502 +        case DevFmtFloat:
   1.503 +            requestedFormat.mBitsPerChannel = 32;
   1.504 +            requestedFormat.mFormatFlags = kAudioFormatFlagIsPacked;
   1.505 +            break;
   1.506 +        case DevFmtByte:
   1.507 +        case DevFmtUShort:
   1.508 +            ERR("%s samples not supported\n", DevFmtTypeString(device->FmtType));
   1.509 +            goto error;
   1.510 +    }
   1.511 +
   1.512 +    switch(device->FmtChans)
   1.513 +    {
   1.514 +        case DevFmtMono:
   1.515 +            requestedFormat.mChannelsPerFrame = 1;
   1.516 +            break;
   1.517 +        case DevFmtStereo:
   1.518 +            requestedFormat.mChannelsPerFrame = 2;
   1.519 +            break;
   1.520 +
   1.521 +        case DevFmtQuad:
   1.522 +        case DevFmtX51:
   1.523 +        case DevFmtX51Side:
   1.524 +        case DevFmtX61:
   1.525 +        case DevFmtX71:
   1.526 +            ERR("%s not supported\n", DevFmtChannelsString(device->FmtChans));
   1.527 +            goto error;
   1.528 +    }
   1.529 +
   1.530 +    requestedFormat.mBytesPerFrame = requestedFormat.mChannelsPerFrame * requestedFormat.mBitsPerChannel / 8;
   1.531 +    requestedFormat.mBytesPerPacket = requestedFormat.mBytesPerFrame;
   1.532 +    requestedFormat.mSampleRate = device->Frequency;
   1.533 +    requestedFormat.mFormatID = kAudioFormatLinearPCM;
   1.534 +    requestedFormat.mReserved = 0;
   1.535 +    requestedFormat.mFramesPerPacket = 1;
   1.536 +
   1.537 +    // save requested format description for later use
   1.538 +    data->format = requestedFormat;
   1.539 +    data->frameSize = FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
   1.540 +
   1.541 +    // Use intermediate format for sample rate conversion (outputFormat)
   1.542 +    // Set sample rate to the same as hardware for resampling later
   1.543 +    outputFormat = requestedFormat;
   1.544 +    outputFormat.mSampleRate = hardwareFormat.mSampleRate;
   1.545 +
   1.546 +    // Determine sample rate ratio for resampling
   1.547 +    data->sampleRateRatio = outputFormat.mSampleRate / device->Frequency;
   1.548 +
   1.549 +    // The output format should be the requested format, but using the hardware sample rate
   1.550 +    // This is because the AudioUnit will automatically scale other properties, except for sample rate
   1.551 +    err = AudioUnitSetProperty(data->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, (void *)&outputFormat, sizeof(outputFormat));
   1.552 +    if(err != noErr)
   1.553 +    {
   1.554 +        ERR("AudioUnitSetProperty failed\n");
   1.555 +        goto error;
   1.556 +    }
   1.557 +
   1.558 +    // Set the AudioUnit output format frame count
   1.559 +    outputFrameCount = device->UpdateSize * data->sampleRateRatio;
   1.560 +    err = AudioUnitSetProperty(data->audioUnit, kAudioUnitProperty_MaximumFramesPerSlice, kAudioUnitScope_Output, 0, &outputFrameCount, sizeof(outputFrameCount));
   1.561 +    if(err != noErr)
   1.562 +    {
   1.563 +        ERR("AudioUnitSetProperty failed: %d\n", err);
   1.564 +        goto error;
   1.565 +    }
   1.566 +
   1.567 +    // Set up sample converter
   1.568 +    err = AudioConverterNew(&outputFormat, &requestedFormat, &data->audioConverter);
   1.569 +    if(err != noErr)
   1.570 +    {
   1.571 +        ERR("AudioConverterNew failed: %d\n", err);
   1.572 +        goto error;
   1.573 +    }
   1.574 +
   1.575 +    // Create a buffer for use in the resample callback
   1.576 +    data->resampleBuffer = malloc(device->UpdateSize * data->frameSize * data->sampleRateRatio);
   1.577 +
   1.578 +    // Allocate buffer for the AudioUnit output
   1.579 +    data->bufferList = allocate_buffer_list(outputFormat.mChannelsPerFrame, device->UpdateSize * data->frameSize * data->sampleRateRatio);
   1.580 +    if(data->bufferList == NULL)
   1.581 +    {
   1.582 +        alcSetError(device, ALC_OUT_OF_MEMORY);
   1.583 +        goto error;
   1.584 +    }
   1.585 +
   1.586 +    data->ring = CreateRingBuffer(data->frameSize, (device->UpdateSize * data->sampleRateRatio) * device->NumUpdates);
   1.587 +    if(data->ring == NULL)
   1.588 +    {
   1.589 +        alcSetError(device, ALC_OUT_OF_MEMORY);
   1.590 +        goto error;
   1.591 +    }
   1.592 +
   1.593 +    return ALC_TRUE;
   1.594 +
   1.595 +error:
   1.596 +    DestroyRingBuffer(data->ring);
   1.597 +    free(data->resampleBuffer);
   1.598 +    destroy_buffer_list(data->bufferList);
   1.599 +
   1.600 +    if(data->audioConverter)
   1.601 +        AudioConverterDispose(data->audioConverter);
   1.602 +    if(data->audioUnit)
   1.603 +        CloseComponent(data->audioUnit);
   1.604 +
   1.605 +    free(data);
   1.606 +    device->ExtraData = NULL;
   1.607 +
   1.608 +    return ALC_FALSE;
   1.609 +}
   1.610 +
   1.611 +static void ca_close_capture(ALCdevice *device)
   1.612 +{
   1.613 +    ca_data *data = (ca_data*)device->ExtraData;
   1.614 +
   1.615 +    DestroyRingBuffer(data->ring);
   1.616 +    free(data->resampleBuffer);
   1.617 +    destroy_buffer_list(data->bufferList);
   1.618 +
   1.619 +    AudioConverterDispose(data->audioConverter);
   1.620 +    CloseComponent(data->audioUnit);
   1.621 +
   1.622 +    free(data);
   1.623 +    device->ExtraData = NULL;
   1.624 +}
   1.625 +
   1.626 +static void ca_start_capture(ALCdevice *device)
   1.627 +{
   1.628 +    ca_data *data = (ca_data*)device->ExtraData;
   1.629 +    OSStatus err = AudioOutputUnitStart(data->audioUnit);
   1.630 +    if(err != noErr)
   1.631 +        ERR("AudioOutputUnitStart failed\n");
   1.632 +}
   1.633 +
   1.634 +static void ca_stop_capture(ALCdevice *device)
   1.635 +{
   1.636 +    ca_data *data = (ca_data*)device->ExtraData;
   1.637 +    OSStatus err = AudioOutputUnitStop(data->audioUnit);
   1.638 +    if(err != noErr)
   1.639 +        ERR("AudioOutputUnitStop failed\n");
   1.640 +}
   1.641 +
   1.642 +static ALCuint ca_available_samples(ALCdevice *device)
   1.643 +{
   1.644 +    ca_data *data = device->ExtraData;
   1.645 +    return RingBufferSize(data->ring) / data->sampleRateRatio;
   1.646 +}
   1.647 +
   1.648 +static void ca_capture_samples(ALCdevice *device, ALCvoid *buffer, ALCuint samples)
   1.649 +{
   1.650 +    ca_data *data = (ca_data*)device->ExtraData;
   1.651 +
   1.652 +    if(samples <= ca_available_samples(device))
   1.653 +    {
   1.654 +        AudioBufferList *list;
   1.655 +        UInt32 frameCount;
   1.656 +        OSStatus err;
   1.657 +
   1.658 +        // If no samples are requested, just return
   1.659 +        if(samples == 0)
   1.660 +            return;
   1.661 +
   1.662 +        // Allocate a temporary AudioBufferList to use as the return resamples data
   1.663 +        list = alloca(sizeof(AudioBufferList) + sizeof(AudioBuffer));
   1.664 +
   1.665 +        // Point the resampling buffer to the capture buffer
   1.666 +        list->mNumberBuffers = 1;
   1.667 +        list->mBuffers[0].mNumberChannels = data->format.mChannelsPerFrame;
   1.668 +        list->mBuffers[0].mDataByteSize = samples * data->frameSize;
   1.669 +        list->mBuffers[0].mData = buffer;
   1.670 +
   1.671 +        // Resample into another AudioBufferList
   1.672 +        frameCount = samples;
   1.673 +        err = AudioConverterFillComplexBuffer(data->audioConverter, ca_capture_conversion_callback, device,
   1.674 +                                              &frameCount, list, NULL);
   1.675 +        if(err != noErr)
   1.676 +        {
   1.677 +            ERR("AudioConverterFillComplexBuffer error: %d\n", err);
   1.678 +            alcSetError(device, ALC_INVALID_VALUE);
   1.679 +        }
   1.680 +    }
   1.681 +    else
   1.682 +        alcSetError(device, ALC_INVALID_VALUE);
   1.683 +}
   1.684 +
   1.685 +static const BackendFuncs ca_funcs = {
   1.686 +    ca_open_playback,
   1.687 +    ca_close_playback,
   1.688 +    ca_reset_playback,
   1.689 +    ca_stop_playback,
   1.690 +    ca_open_capture,
   1.691 +    ca_close_capture,
   1.692 +    ca_start_capture,
   1.693 +    ca_stop_capture,
   1.694 +    ca_capture_samples,
   1.695 +    ca_available_samples
   1.696 +};
   1.697 +
   1.698 +ALCboolean alc_ca_init(BackendFuncs *func_list)
   1.699 +{
   1.700 +    *func_list = ca_funcs;
   1.701 +    return ALC_TRUE;
   1.702 +}
   1.703 +
   1.704 +void alc_ca_deinit(void)
   1.705 +{
   1.706 +}
   1.707 +
   1.708 +void alc_ca_probe(enum DevProbe type)
   1.709 +{
   1.710 +    switch(type)
   1.711 +    {
   1.712 +        case DEVICE_PROBE:
   1.713 +            AppendDeviceList(ca_device);
   1.714 +            break;
   1.715 +        case ALL_DEVICE_PROBE:
   1.716 +            AppendAllDeviceList(ca_device);
   1.717 +            break;
   1.718 +        case CAPTURE_DEVICE_PROBE:
   1.719 +            AppendCaptureDeviceList(ca_device);
   1.720 +            break;
   1.721 +    }
   1.722 +}