jack2/macosx/coreaudio/JackCoreAudioAdapter.cpp

/*
Copyright (C) 2008 Grame

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "JackCoreAudioAdapter.h"
#include "JackError.h"
#include <unistd.h>

#include <CoreServices/CoreServices.h>

namespace Jack
{

static void PrintStreamDesc(AudioStreamBasicDescription *inDesc)
{
    jack_log("- - - - - - - - - - - - - - - - - - - -");
    jack_log("  Sample Rate:%f", inDesc->mSampleRate);
    jack_log("  Format ID:%.*s", (int) sizeof(inDesc->mFormatID), (char*)&inDesc->mFormatID);
    jack_log("  Format Flags:%lX", inDesc->mFormatFlags);
    jack_log("  Bytes per Packet:%ld", inDesc->mBytesPerPacket);
    jack_log("  Frames per Packet:%ld", inDesc->mFramesPerPacket);
    jack_log("  Bytes per Frame:%ld", inDesc->mBytesPerFrame);
    jack_log("  Channels per Frame:%ld", inDesc->mChannelsPerFrame);
    jack_log("  Bits per Channel:%ld", inDesc->mBitsPerChannel);
    jack_log("- - - - - - - - - - - - - - - - - - - -");
}

static OSStatus DisplayDeviceNames()
{
    UInt32 size;
    Boolean isWritable;
    int i, deviceNum;
    OSStatus err;
    CFStringRef UIname;

    err = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &size, &isWritable);
    if (err != noErr)
        return err;

    deviceNum = size / sizeof(AudioDeviceID);
    AudioDeviceID devices[deviceNum];

    err = AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &size, devices);
    if (err != noErr)
        return err;

    for (i = 0; i < deviceNum; i++) {
        char device_name[256];
        char internal_name[256];

        size = sizeof(CFStringRef);
        UIname = NULL;
        err = AudioDeviceGetProperty(devices[i], 0, false, kAudioDevicePropertyDeviceUID, &size, &UIname);
        if (err == noErr) {
            CFStringGetCString(UIname, internal_name, 256, CFStringGetSystemEncoding());
        } else {
            goto error;
        }

        size = 256;
        err = AudioDeviceGetProperty(devices[i], 0, false, kAudioDevicePropertyDeviceName, &size, device_name);
        if (err != noErr)
            return err;

        jack_info("Device name = \'%s\', internal_name = \'%s\' (to be used as -C, -P, or -d parameter)", device_name, internal_name);
    }

    return noErr;

error:
    if (UIname != NULL)
        CFRelease(UIname);
    return err;
}

static void printError(OSStatus err)
{
    switch (err) {
        case kAudioHardwareNoError:
            jack_log("error code : kAudioHardwareNoError");
            break;
        case kAudioConverterErr_FormatNotSupported:
            jack_log("error code : kAudioConverterErr_FormatNotSupported");
            break;
        case kAudioConverterErr_OperationNotSupported:
            jack_log("error code : kAudioConverterErr_OperationNotSupported");
            break;
        case kAudioConverterErr_PropertyNotSupported:
            jack_log("error code : kAudioConverterErr_PropertyNotSupported");
            break;
        case kAudioConverterErr_InvalidInputSize:
            jack_log("error code : kAudioConverterErr_InvalidInputSize");
            break;
        case kAudioConverterErr_InvalidOutputSize:
            jack_log("error code : kAudioConverterErr_InvalidOutputSize");
            break;
        case kAudioConverterErr_UnspecifiedError:
            jack_log("error code : kAudioConverterErr_UnspecifiedError");
            break;
        case kAudioConverterErr_BadPropertySizeError:
            jack_log("error code : kAudioConverterErr_BadPropertySizeError");
            break;
        case kAudioConverterErr_RequiresPacketDescriptionsError:
            jack_log("error code : kAudioConverterErr_RequiresPacketDescriptionsError");
            break;
        case kAudioConverterErr_InputSampleRateOutOfRange:
            jack_log("error code : kAudioConverterErr_InputSampleRateOutOfRange");
            break;
        case kAudioConverterErr_OutputSampleRateOutOfRange:
            jack_log("error code : kAudioConverterErr_OutputSampleRateOutOfRange");
            break;
        case kAudioHardwareNotRunningError:
            jack_log("error code : kAudioHardwareNotRunningError");
            break;
        case kAudioHardwareUnknownPropertyError:
            jack_log("error code : kAudioHardwareUnknownPropertyError");
            break;
        case kAudioHardwareIllegalOperationError:
            jack_log("error code : kAudioHardwareIllegalOperationError");
            break;
        case kAudioHardwareBadDeviceError:
            jack_log("error code : kAudioHardwareBadDeviceError");
            break;
        case kAudioHardwareBadStreamError:
            jack_log("error code : kAudioHardwareBadStreamError");
            break;
        case kAudioDeviceUnsupportedFormatError:
            jack_log("error code : kAudioDeviceUnsupportedFormatError");
            break;
        case kAudioDevicePermissionsError:
            jack_log("error code : kAudioDevicePermissionsError");
            break;
        case kAudioHardwareBadObjectError:
            jack_log("error code : kAudioHardwareBadObjectError");
            break;
        case kAudioHardwareUnsupportedOperationError:
            jack_log("error code : kAudioHardwareUnsupportedOperationError");
            break;
        default:
            jack_log("error code : unknown");
            break;
    }
}

OSStatus JackCoreAudioAdapter::SRNotificationCallback(AudioDeviceID inDevice,
                                                        UInt32 inChannel,
                                                        Boolean	isInput,
                                                        AudioDevicePropertyID inPropertyID,
                                                        void* inClientData)
{
    JackCoreAudioAdapter* driver = static_cast<JackCoreAudioAdapter*>(inClientData);

    switch (inPropertyID) {

        case kAudioDevicePropertyNominalSampleRate: {
            jack_log("JackCoreAudioDriver::SRNotificationCallback kAudioDevicePropertyNominalSampleRate");
            driver->fState = true;
            break;
        }
    }

    return noErr;
}

// A better implementation would try to recover in case of hardware device change (see HALLAB HLFilePlayerWindowControllerAudioDevicePropertyListenerProc code)
OSStatus JackCoreAudioAdapter::DeviceNotificationCallback(AudioDeviceID inDevice,
        UInt32 inChannel,
        Boolean	isInput,
        AudioDevicePropertyID inPropertyID,
        void* inClientData)
{
        
    switch (inPropertyID) {
        
        case kAudioDeviceProcessorOverload: {
            jack_error("JackCoreAudioAdapter::DeviceNotificationCallback kAudioDeviceProcessorOverload");
            break;
		}

        case kAudioDevicePropertyStreamConfiguration: {
            jack_error("Cannot handle kAudioDevicePropertyStreamConfiguration");
            return kAudioHardwareUnsupportedOperationError;
        }
            
        case kAudioDevicePropertyNominalSampleRate: {
            jack_error("Cannot handle kAudioDevicePropertyNominalSampleRate");
            return kAudioHardwareUnsupportedOperationError;
        }
            
    }
    return noErr;
}

int JackCoreAudioAdapter::AddListeners()
{
    OSStatus err = noErr;

    // Add listeners
    err = AudioDeviceAddPropertyListener(fDeviceID, 0, true, kAudioDeviceProcessorOverload, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDeviceProcessorOverload");
        printError(err);
        return -1;
    }
    
    err = AudioDeviceAddPropertyListener(fDeviceID, 0, true, kAudioHardwarePropertyDevices, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioHardwarePropertyDevices");
        printError(err);
        return -1;
    }

    err = AudioDeviceAddPropertyListener(fDeviceID, 0, true, kAudioDevicePropertyNominalSampleRate, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDevicePropertyNominalSampleRate");
        printError(err);
        return -1;
    }

    err = AudioDeviceAddPropertyListener(fDeviceID, 0, true, kAudioDevicePropertyDeviceIsRunning, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDevicePropertyDeviceIsRunning");
        printError(err);
        return -1;
    }

    err = AudioDeviceAddPropertyListener(fDeviceID, 0, true, kAudioDevicePropertyStreamConfiguration, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDevicePropertyStreamConfiguration");
        printError(err);
        return -1;
    }

    err = AudioDeviceAddPropertyListener(fDeviceID, 0, false, kAudioDevicePropertyStreamConfiguration, DeviceNotificationCallback, this);
    if (err != noErr) {
        jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDevicePropertyStreamConfiguration");
        printError(err);
        return -1;
    }

    return 0;
}

void JackCoreAudioAdapter::RemoveListeners()
{
    AudioDeviceRemovePropertyListener(fDeviceID, 0, true, kAudioDeviceProcessorOverload, DeviceNotificationCallback);
    AudioDeviceRemovePropertyListener(fDeviceID, 0, true, kAudioHardwarePropertyDevices, DeviceNotificationCallback);
    AudioDeviceRemovePropertyListener(fDeviceID, 0, true, kAudioDevicePropertyNominalSampleRate, DeviceNotificationCallback);
    AudioDeviceRemovePropertyListener(fDeviceID, 0, true, kAudioDevicePropertyDeviceIsRunning, DeviceNotificationCallback);
    AudioDeviceRemovePropertyListener(fDeviceID, 0, true, kAudioDevicePropertyStreamConfiguration, DeviceNotificationCallback);
    AudioDeviceRemovePropertyListener(fDeviceID, 0, false, kAudioDevicePropertyStreamConfiguration, DeviceNotificationCallback);
}

OSStatus JackCoreAudioAdapter::Render(void *inRefCon,
                                        AudioUnitRenderActionFlags *ioActionFlags,
                                        const AudioTimeStamp *inTimeStamp,
                                        UInt32 inBusNumber,
                                        UInt32 inNumberFrames,
                                        AudioBufferList *ioData)
{
    JackCoreAudioAdapter* adapter = static_cast<JackCoreAudioAdapter*>(inRefCon);
    AudioUnitRender(adapter->fAUHAL, ioActionFlags, inTimeStamp, 1, inNumberFrames, adapter->fInputData);
    
    float* inputBuffer[adapter->fCaptureChannels];
    float* outputBuffer[adapter->fPlaybackChannels];
 
    for (int i = 0; i < adapter->fCaptureChannels; i++) {
        inputBuffer[i] = (float*)adapter->fInputData->mBuffers[i].mData;
    }
    for (int i = 0; i < adapter->fPlaybackChannels; i++) {
        outputBuffer[i] = (float*)ioData->mBuffers[i].mData;
    }
    
    adapter->PushAndPull((float**)inputBuffer, (float**)outputBuffer, inNumberFrames);
    return noErr;
}

JackCoreAudioAdapter::JackCoreAudioAdapter(jack_nframes_t buffer_size, jack_nframes_t sample_rate, const JSList* params)
                :JackAudioAdapterInterface(buffer_size, sample_rate), fInputData(0), fCapturing(false), fPlaying(false), fState(false)
{
    const JSList* node;
    const jack_driver_param_t* param;
    int in_nChannels = 0;
    int out_nChannels = 0;
    char captureName[256];
    char playbackName[256];
    fCaptureUID[0] = 0;
    fPlaybackUID[0] = 0;
    
    // Default values
    fCaptureChannels = -1;
    fPlaybackChannels = -1;
    
    SInt32 major;
    SInt32 minor;
    Gestalt(gestaltSystemVersionMajor, &major);
    Gestalt(gestaltSystemVersionMinor, &minor);
    
    // Starting with 10.6 systems, the HAL notification thread is created internally
    if (major == 10 && minor >= 6) {
        CFRunLoopRef theRunLoop = NULL;
        AudioObjectPropertyAddress theAddress = { kAudioHardwarePropertyRunLoop, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMaster };
        OSStatus theError = AudioObjectSetPropertyData (kAudioObjectSystemObject, &theAddress, 0, NULL, sizeof(CFRunLoopRef), &theRunLoop);
        if (theError != noErr) {
            jack_error("JackCoreAudioAdapter::Open kAudioHardwarePropertyRunLoop error");
        }
    }
  
    for (node = params; node; node = jack_slist_next(node)) {
        param = (const jack_driver_param_t*) node->data;

        switch (param->character) {

            case 'c' :
                fCaptureChannels = fPlaybackChannels = param->value.ui;
                break;

            case 'i':
                fCaptureChannels = param->value.ui;
                break;

            case 'o':
                fPlaybackChannels = param->value.ui;
                break;

            case 'C':
                fCapturing = true;
                strncpy(fCaptureUID, param->value.str, 256);
                break;

            case 'P':
                fPlaying = true;
                strncpy(fPlaybackUID, param->value.str, 256);
                break;
                
            case 'd':
                strncpy(fCaptureUID, param->value.str, 256);
                strncpy(fPlaybackUID, param->value.str, 256);
                break;

            case 'D':
                fCapturing = fPlaying = true;
                break;

            case 'r':
                SetAdaptedSampleRate(param->value.ui);
                break;

            case 'p':
                SetAdaptedBufferSize(param->value.ui);
                break;
                
            case 'l':
                DisplayDeviceNames();
                break;
                
            case 'q':
                fQuality = param->value.ui;
                break;
                
            case 'g':
                fRingbufferCurSize = param->value.ui;
                fAdaptative = false;
                break;
        }
    }
    
    /* duplex is the default */
    if (!fCapturing && !fPlaying) {
        fCapturing = true;
        fPlaying = true;
    }
    
    if (SetupDevices(fCaptureUID, fPlaybackUID, captureName, playbackName, fAdaptedSampleRate) < 0)
        throw -1;
  
    if (SetupChannels(fCapturing, fPlaying, fCaptureChannels, fPlaybackChannels, in_nChannels, out_nChannels, true) < 0)
        throw -1;
    
    if (SetupBufferSize(fAdaptedBufferSize) < 0)
         throw -1;
 
    if (SetupSampleRate(fAdaptedSampleRate) < 0)
        throw -1;
           
    if (OpenAUHAL(fCapturing, fPlaying, fCaptureChannels, fPlaybackChannels, in_nChannels, out_nChannels, fAdaptedBufferSize, fAdaptedSampleRate) < 0) 
        throw -1;
         
    if (fCapturing && fCaptureChannels > 0)
        if (SetupBuffers(fCaptureChannels) < 0)
            throw -1;
       
    if (AddListeners() < 0)
        throw -1;
}

OSStatus JackCoreAudioAdapter::GetDefaultDevice(AudioDeviceID* id)
{
    OSStatus res;
    UInt32 theSize = sizeof(UInt32);
    AudioDeviceID inDefault;
    AudioDeviceID outDefault;

    if ((res = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice, &theSize, &inDefault)) != noErr)
        return res;

    if ((res = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &theSize, &outDefault)) != noErr)
        return res;

    jack_log("GetDefaultDevice: input = %ld output = %ld", inDefault, outDefault);

    // Get the device only if default input and output are the same
    if (inDefault == outDefault) {
        *id = inDefault;
        return noErr;
    } else {
        jack_error("Default input and output devices are not the same !!");
        return kAudioHardwareBadDeviceError;
    }
}

OSStatus JackCoreAudioAdapter::GetTotalChannels(AudioDeviceID device, int& channelCount, bool isInput)
{
    OSStatus err = noErr;
    UInt32	outSize;
    Boolean	outWritable;
    AudioBufferList* bufferList = 0;

    channelCount = 0;
    err = AudioDeviceGetPropertyInfo(device, 0, isInput, kAudioDevicePropertyStreamConfiguration, &outSize, &outWritable);
    if (err == noErr) {
        bufferList = (AudioBufferList*)malloc(outSize);
        err = AudioDeviceGetProperty(device, 0, isInput, kAudioDevicePropertyStreamConfiguration, &outSize, bufferList);
        if (err == noErr) {
            for (unsigned int i = 0; i < bufferList->mNumberBuffers; i++)
                channelCount += bufferList->mBuffers[i].mNumberChannels;
        }

        if (bufferList)
            free(bufferList);
    }

    return err;
}

OSStatus JackCoreAudioAdapter::GetDeviceIDFromUID(const char* UID, AudioDeviceID* id)
{
    UInt32 size = sizeof(AudioValueTranslation);
    CFStringRef inIUD = CFStringCreateWithCString(NULL, UID, CFStringGetSystemEncoding());
    AudioValueTranslation value = { &inIUD, sizeof(CFStringRef), id, sizeof(AudioDeviceID) };

    if (inIUD == NULL) {
        return kAudioHardwareUnspecifiedError;
    } else {
        OSStatus res = AudioHardwareGetProperty(kAudioHardwarePropertyDeviceForUID, &size, &value);
        CFRelease(inIUD);
        jack_log("GetDeviceIDFromUID %s %ld", UID, *id);
        return (*id == kAudioDeviceUnknown) ? kAudioHardwareBadDeviceError : res;
    }
}

OSStatus JackCoreAudioAdapter::GetDefaultInputDevice(AudioDeviceID* id)
{
    OSStatus res;
    UInt32 theSize = sizeof(UInt32);
    AudioDeviceID inDefault;

    if ((res = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice, &theSize, &inDefault)) != noErr)
        return res;

    jack_log("GetDefaultInputDevice: input = %ld ", inDefault);
    *id = inDefault;
    return noErr;
}

OSStatus JackCoreAudioAdapter::GetDefaultOutputDevice(AudioDeviceID* id)
{
    OSStatus res;
    UInt32 theSize = sizeof(UInt32);
    AudioDeviceID outDefault;

    if ((res = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &theSize, &outDefault)) != noErr)
        return res;

    jack_log("GetDefaultOutputDevice: output = %ld", outDefault);
    *id = outDefault;
    return noErr;
}

OSStatus JackCoreAudioAdapter::GetDeviceNameFromID(AudioDeviceID id, char* name)
{
    UInt32 size = 256;
    return AudioDeviceGetProperty(id, 0, false, kAudioDevicePropertyDeviceName, &size, name);
}

// Setup
int JackCoreAudioAdapter::SetupDevices(const char* capture_driver_uid,
                                        const char* playback_driver_uid,
                                        char* capture_driver_name,
                                        char* playback_driver_name,
                                        jack_nframes_t samplerate)
{
    capture_driver_name[0] = 0;
    playback_driver_name[0] = 0;

    // Duplex
    if (strcmp(capture_driver_uid, "") != 0 && strcmp(playback_driver_uid, "") != 0) {
    
        // Same device for capture and playback...
        if (strcmp(capture_driver_uid, playback_driver_uid) == 0)  {
            
            if (GetDeviceIDFromUID(playback_driver_uid, &fDeviceID) != noErr) {
                jack_log("Will take default in/out");
                if (GetDefaultDevice(&fDeviceID) != noErr) {
                    jack_error("Cannot open default device");
                    return -1;
                }
            }
            if (GetDeviceNameFromID(fDeviceID, capture_driver_name) != noErr || GetDeviceNameFromID(fDeviceID, playback_driver_name) != noErr) {
                jack_error("Cannot get device name from device ID");
                return -1;
            }
            
        } else {
        
            // Creates aggregate device
            AudioDeviceID captureID, playbackID;
            if (GetDeviceIDFromUID(capture_driver_uid, &captureID) != noErr)
                return -1;
            if (GetDeviceIDFromUID(playback_driver_uid, &playbackID) != noErr) 
                return -1;
            if (CreateAggregateDevice(captureID, playbackID, samplerate, &fDeviceID) != noErr)
                return -1;
        }

    // Capture only
    } else if (strcmp(capture_driver_uid, "") != 0) {
        jack_log("JackCoreAudioAdapter::Open capture only");
        if (GetDeviceIDFromUID(capture_driver_uid, &fDeviceID) != noErr) {
            if (GetDefaultInputDevice(&fDeviceID) != noErr) {
                jack_error("Cannot open default device");
                return -1;
            }
        }
        if (GetDeviceNameFromID(fDeviceID, capture_driver_name) != noErr) {
            jack_error("Cannot get device name from device ID");
            return -1;
        }

    // Playback only
    } else if (strcmp(playback_driver_uid, "") != 0) {
        jack_log("JackCoreAudioAdapter::Open playback only");
        if (GetDeviceIDFromUID(playback_driver_uid, &fDeviceID) != noErr) {
            if (GetDefaultOutputDevice(&fDeviceID) != noErr) {
                jack_error("Cannot open default device");
                return -1;
            }
        }
        if (GetDeviceNameFromID(fDeviceID, playback_driver_name) != noErr) {
            jack_error("Cannot get device name from device ID");
            return -1;
        }

    // Use default driver in duplex mode
    } else {
        jack_log("JackCoreAudioAdapter::Open default driver");
        if (GetDefaultDevice(&fDeviceID) != noErr) {
            jack_error("Cannot open default device");
            return -1;
        }
        if (GetDeviceNameFromID(fDeviceID, capture_driver_name) != noErr || GetDeviceNameFromID(fDeviceID, playback_driver_name) != noErr) {
            jack_error("Cannot get device name from device ID");
            return -1;
        }
    }

    return 0;
}

int JackCoreAudioAdapter::SetupChannels(bool capturing,
                                        bool playing,
                                        int& inchannels,
                                        int& outchannels,
                                        int& in_nChannels,
                                        int& out_nChannels,
                                        bool strict)
{
    OSStatus err = noErr;

    if (capturing) {
        err = GetTotalChannels(fDeviceID, in_nChannels, true);
        if (err != noErr) {
            jack_error("Cannot get input channel number");
            printError(err);
            return -1;
        } else {
            jack_log("Max input channels : %d", in_nChannels);
        }
    }

    if (playing) {
        err = GetTotalChannels(fDeviceID, out_nChannels, false);
        if (err != noErr) {
            jack_error("Cannot get output channel number");
            printError(err);
            return -1;
        } else {
            jack_log("Max output channels : %d", out_nChannels);
        }
    }

    if (inchannels > in_nChannels) {
        jack_error("This device hasn't required input channels inchannels = %ld in_nChannels = %ld", inchannels, in_nChannels);
        if (strict)
            return -1;
    }

    if (outchannels > out_nChannels) {
        jack_error("This device hasn't required output channels outchannels = %ld out_nChannels = %ld", outchannels, out_nChannels);
        if (strict)
            return -1;
    }

    if (inchannels == -1) {
        jack_log("Setup max in channels = %ld", in_nChannels);
        inchannels = in_nChannels;
    }

    if (outchannels == -1) {
        jack_log("Setup max out channels = %ld", out_nChannels);
        outchannels = out_nChannels;
    }
 
    return 0;
}

int JackCoreAudioAdapter::SetupBufferSize(jack_nframes_t buffer_size)
{
    // Setting buffer size
    UInt32 outSize = sizeof(UInt32);
    OSStatus err = AudioDeviceSetProperty(fDeviceID, NULL, 0, false, kAudioDevicePropertyBufferFrameSize, outSize, &buffer_size);
    if (err != noErr) {
        jack_error("Cannot set buffer size %ld", buffer_size);
        printError(err);
        return -1;
    }
    
    return 0;
}

int JackCoreAudioAdapter::SetupSampleRate(jack_nframes_t samplerate)
{
    return SetupSampleRateAux(fDeviceID, samplerate);
}

int JackCoreAudioAdapter::SetupSampleRateAux(AudioDeviceID inDevice, jack_nframes_t samplerate)
{
    OSStatus err = noErr;
    UInt32 outSize;
    Float64 sampleRate;
    
    // Get sample rate
    outSize =  sizeof(Float64);
    err = AudioDeviceGetProperty(inDevice, 0, kAudioDeviceSectionGlobal, kAudioDevicePropertyNominalSampleRate, &outSize, &sampleRate);
    if (err != noErr) {
        jack_error("Cannot get current sample rate");
        printError(err);
        return -1;
    }
    
    // If needed, set new sample rate
    if (samplerate != (jack_nframes_t)sampleRate) {
        sampleRate = (Float64)samplerate;
        
        // To get SR change notification
        err = AudioDeviceAddPropertyListener(inDevice, 0, true, kAudioDevicePropertyNominalSampleRate, SRNotificationCallback, this);
        if (err != noErr) {
            jack_error("Error calling AudioDeviceAddPropertyListener with kAudioDevicePropertyNominalSampleRate");
            printError(err);
            return -1;
        }
        err = AudioDeviceSetProperty(inDevice, NULL, 0, kAudioDeviceSectionGlobal, kAudioDevicePropertyNominalSampleRate, outSize, &sampleRate);
        if (err != noErr) {
            jack_error("Cannot set sample rate = %ld", samplerate);
            printError(err);
            return -1;
        }
        
        // Waiting for SR change notification
        int count = 0;
        while (!fState && count++ < WAIT_COUNTER) {
            usleep(100000);
            jack_log("Wait count = %d", count);
        }
        
        // Remove SR change notification
        AudioDeviceRemovePropertyListener(inDevice, 0, true, kAudioDevicePropertyNominalSampleRate, SRNotificationCallback);
    }
    
    return 0;
}

int JackCoreAudioAdapter::SetupBuffers(int inchannels)
{
    jack_log("JackCoreAudioAdapter::SetupBuffers: input = %ld", inchannels);

    // Prepare buffers
    fInputData = (AudioBufferList*)malloc(sizeof(UInt32) + inchannels * sizeof(AudioBuffer));
    if (fInputData == 0) {
        jack_error("Cannot allocate memory for input buffers");
        return -1;
    }
    fInputData->mNumberBuffers = inchannels;
    for (int i = 0; i < fCaptureChannels; i++) {
        fInputData->mBuffers[i].mNumberChannels = 1;
        fInputData->mBuffers[i].mDataByteSize = fAdaptedBufferSize * sizeof(float);
        fInputData->mBuffers[i].mData = malloc(fAdaptedBufferSize * sizeof(float));
    }
    return 0;
}

void JackCoreAudioAdapter::DisposeBuffers()
{
    if (fInputData) {
        for (int i = 0; i < fCaptureChannels; i++)
            free(fInputData->mBuffers[i].mData);
        free(fInputData);
        fInputData = 0;
    }
}

int JackCoreAudioAdapter::OpenAUHAL(bool capturing,
                                   bool playing,
                                   int inchannels,
                                   int outchannels,
                                   int in_nChannels,
                                   int out_nChannels,
                                   jack_nframes_t buffer_size,
                                   jack_nframes_t samplerate)
{
    ComponentResult err1;
    UInt32 enableIO;
    AudioStreamBasicDescription srcFormat, dstFormat;
    AudioDeviceID currAudioDeviceID;
    UInt32 size;

    jack_log("OpenAUHAL capturing = %d playing = %d inchannels = %d outchannels = %d in_nChannels = %d out_nChannels = %d", capturing, playing, inchannels, outchannels, in_nChannels, out_nChannels);

    if (inchannels == 0 && outchannels == 0) {
        jack_error("No input and output channels...");
        return -1;
    }
         
    // AUHAL
    ComponentDescription cd = {kAudioUnitType_Output, kAudioUnitSubType_HALOutput, kAudioUnitManufacturer_Apple, 0, 0};
    Component HALOutput = FindNextComponent(NULL, &cd);

    err1 = OpenAComponent(HALOutput, &fAUHAL);
    if (err1 != noErr) {
        jack_error("Error calling OpenAComponent");
        printError(err1);
        goto error;
    }

    err1 = AudioUnitInitialize(fAUHAL);
    if (err1 != noErr) {
        jack_error("Cannot initialize AUHAL unit");
        printError(err1);
        goto error;
    }

    // Start I/O
    if (capturing && inchannels > 0) {
        enableIO = 1;
        jack_log("Setup AUHAL input on");
    } else {
        enableIO = 0;
        jack_log("Setup AUHAL input off");
    }
    
    err1 = AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &enableIO, sizeof(enableIO));
    if (err1 != noErr) {
        jack_error("Error calling AudioUnitSetProperty - kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input");
        printError(err1);
        goto error;
    }

    if (playing && outchannels > 0) {
        enableIO = 1;
        jack_log("Setup AUHAL output on");
    } else {
        enableIO = 0;
        jack_log("Setup AUHAL output off");
    }
    
    err1 = AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, 0, &enableIO, sizeof(enableIO));
    if (err1 != noErr) {
        jack_error("Error calling AudioUnitSetProperty - kAudioOutputUnitProperty_EnableIO,kAudioUnitScope_Output");
        printError(err1);
        goto error;
    }
    
    size = sizeof(AudioDeviceID);
    err1 = AudioUnitGetProperty(fAUHAL, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &currAudioDeviceID, &size);
    if (err1 != noErr) {
        jack_error("Error calling AudioUnitGetProperty - kAudioOutputUnitProperty_CurrentDevice");
        printError(err1);
        goto error;
    } else {
        jack_log("AudioUnitGetPropertyCurrentDevice = %d", currAudioDeviceID);
    }

    // Setup up choosen device, in both input and output cases
    err1 = AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &fDeviceID, sizeof(AudioDeviceID));
    if (err1 != noErr) {
        jack_error("Error calling AudioUnitSetProperty - kAudioOutputUnitProperty_CurrentDevice");
        printError(err1);
        goto error;
    }
  
    // Set buffer size
    if (capturing && inchannels > 0) {
        err1 = AudioUnitSetProperty(fAUHAL, kAudioUnitProperty_MaximumFramesPerSlice, kAudioUnitScope_Global, 1, (UInt32*)&buffer_size, sizeof(UInt32));
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioUnitProperty_MaximumFramesPerSlice");
            printError(err1);
            goto error;
        }
    }

    if (playing && outchannels > 0) {
        err1 = AudioUnitSetProperty(fAUHAL, kAudioUnitProperty_MaximumFramesPerSlice, kAudioUnitScope_Global, 0, (UInt32*)&buffer_size, sizeof(UInt32));
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioUnitProperty_MaximumFramesPerSlice");
            printError(err1);
            goto error;
        }
    }

    // Setup channel map
    if (capturing && inchannels > 0 && inchannels < in_nChannels) {
        SInt32 chanArr[in_nChannels];
        for (int i = 0; i < in_nChannels; i++) {
            chanArr[i] = -1;
        }
        for (int i = 0; i < inchannels; i++) {
            chanArr[i] = i;
        }
        AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_ChannelMap , kAudioUnitScope_Input, 1, chanArr, sizeof(SInt32) * in_nChannels);
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioOutputUnitProperty_ChannelMap 1");
            printError(err1);
            goto error;
        }
    }

    if (playing && outchannels > 0 && outchannels < out_nChannels) {
        SInt32 chanArr[out_nChannels];
        for (int i = 0;	i < out_nChannels; i++) {
            chanArr[i] = -1;
        }
        for (int i = 0; i < outchannels; i++) {
            chanArr[i] = i;
        }
        err1 = AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_ChannelMap, kAudioUnitScope_Output, 0, chanArr, sizeof(SInt32) * out_nChannels);
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioOutputUnitProperty_ChannelMap 0");
            printError(err1);
            goto error;
        }
    }

    // Setup stream converters
    if (capturing && inchannels > 0) {
    
        size = sizeof(AudioStreamBasicDescription);
        err1 = AudioUnitGetProperty(fAUHAL, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &srcFormat, &size);
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitGetProperty - kAudioUnitProperty_StreamFormat kAudioUnitScope_Input");
            printError(err1);
            goto error;
        }
        PrintStreamDesc(&srcFormat);
              
        jack_log("Setup AUHAL input stream converter SR = %ld", samplerate);
        srcFormat.mSampleRate = samplerate;
        srcFormat.mFormatID = kAudioFormatLinearPCM;
        srcFormat.mFormatFlags = kAudioFormatFlagsNativeFloatPacked | kLinearPCMFormatFlagIsNonInterleaved;
        srcFormat.mBytesPerPacket = sizeof(float);
        srcFormat.mFramesPerPacket = 1;
        srcFormat.mBytesPerFrame = sizeof(float);
        srcFormat.mChannelsPerFrame = inchannels;
        srcFormat.mBitsPerChannel = 32;
        PrintStreamDesc(&srcFormat);
      
        err1 = AudioUnitSetProperty(fAUHAL, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &srcFormat, sizeof(AudioStreamBasicDescription));
        
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioUnitProperty_StreamFormat kAudioUnitScope_Input");
            printError(err1);
            goto error;
        }
    }

    if (playing && outchannels > 0) {
    
        size = sizeof(AudioStreamBasicDescription);
        err1 = AudioUnitGetProperty(fAUHAL, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 1, &dstFormat, &size);
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitGetProperty - kAudioUnitProperty_StreamFormat kAudioUnitScope_Output");
            printError(err1);
            goto error;
        }
        PrintStreamDesc(&dstFormat);
         
        jack_log("Setup AUHAL output stream converter SR = %ld", samplerate);
        dstFormat.mSampleRate = samplerate;
        dstFormat.mFormatID = kAudioFormatLinearPCM;
        dstFormat.mFormatFlags = kAudioFormatFlagsNativeFloatPacked | kLinearPCMFormatFlagIsNonInterleaved;
        dstFormat.mBytesPerPacket = sizeof(float);
        dstFormat.mFramesPerPacket = 1;
        dstFormat.mBytesPerFrame = sizeof(float);
        dstFormat.mChannelsPerFrame = outchannels;
        dstFormat.mBitsPerChannel = 32;
        PrintStreamDesc(&dstFormat);
       
        err1 = AudioUnitSetProperty(fAUHAL, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &dstFormat, sizeof(AudioStreamBasicDescription));
        
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioUnitProperty_StreamFormat kAudioUnitScope_Output");
            printError(err1);
            goto error;
        }
    }

    // Setup callbacks
    if (inchannels > 0 && outchannels == 0) {
        AURenderCallbackStruct output;
        output.inputProc = Render;
        output.inputProcRefCon = this;
        err1 = AudioUnitSetProperty(fAUHAL, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, 0, &output, sizeof(output));
        if (err1 != noErr) {
            jack_error("Error calling  AudioUnitSetProperty - kAudioUnitProperty_SetRenderCallback 1");
            printError(err1);
            goto error;
        }
    } else {
        AURenderCallbackStruct output;
        output.inputProc = Render;
        output.inputProcRefCon = this;
        err1 = AudioUnitSetProperty(fAUHAL, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &output, sizeof(output));
        if (err1 != noErr) {
            jack_error("Error calling AudioUnitSetProperty - kAudioUnitProperty_SetRenderCallback 0");
            printError(err1);
            goto error;
        }
    }

    return 0;
    
error:
    CloseAUHAL();
    return -1;
}

OSStatus JackCoreAudioAdapter::DestroyAggregateDevice() 
{
    OSStatus osErr = noErr;
    AudioObjectPropertyAddress pluginAOPA;
    pluginAOPA.mSelector = kAudioPlugInDestroyAggregateDevice;
    pluginAOPA.mScope = kAudioObjectPropertyScopeGlobal;
    pluginAOPA.mElement = kAudioObjectPropertyElementMaster;
    UInt32 outDataSize;
  
    osErr = AudioObjectGetPropertyDataSize(fPluginID, &pluginAOPA, 0, NULL, &outDataSize);
    if (osErr != noErr) {
        jack_error("JackCoreAudioDriver::DestroyAggregateDevice : AudioObjectGetPropertyDataSize error");
        printError(osErr);
        return osErr;
    }
        
    osErr = AudioObjectGetPropertyData(fPluginID, &pluginAOPA, 0, NULL, &outDataSize, &fDeviceID);
    if (osErr != noErr) {
        jack_error("JackCoreAudioDriver::DestroyAggregateDevice : AudioObjectGetPropertyData error");
        printError(osErr);
        return osErr;
    }
    
    return noErr;
}

static CFStringRef GetDeviceName(AudioDeviceID id)
{
    UInt32 size = sizeof(CFStringRef);
    CFStringRef UIname;
    OSStatus err = AudioDeviceGetProperty(id, 0, false, kAudioDevicePropertyDeviceUID, &size, &UIname);
    return (err == noErr) ? UIname : NULL;
}

OSStatus JackCoreAudioAdapter::CreateAggregateDevice(AudioDeviceID captureDeviceID, AudioDeviceID playbackDeviceID, jack_nframes_t samplerate, AudioDeviceID* outAggregateDevice) 
{
    OSStatus osErr = noErr;
    UInt32 outSize;
    Boolean outWritable;
    
    // Check devices...
    if (IsAggregateDevice(captureDeviceID) || IsAggregateDevice(playbackDeviceID)) {
        jack_error("JackCoreAudioAdapter::CreateAggregateDevice : cannot agregate devices that are already aggregate devices...");
        return -1;
    }
    
    //---------------------------------------------------------------------------
    // Setup SR of both devices otherwise creating AD may fail...
    //---------------------------------------------------------------------------
    if (SetupSampleRateAux(captureDeviceID, samplerate) < 0) {
        jack_error("JackCoreAudioDriver::CreateAggregateDevice : cannot set SR of input device");
    }
    if (SetupSampleRateAux(playbackDeviceID, samplerate) < 0) {
        jack_error("JackCoreAudioDriver::CreateAggregateDevice : cannot set SR of output device");
    }

    //---------------------------------------------------------------------------
    // Start to create a new aggregate by getting the base audio hardware plugin
    //---------------------------------------------------------------------------
    
    char capture_name[256];
    char playback_name[256];
    GetDeviceNameFromID(captureDeviceID, capture_name);
    GetDeviceNameFromID(playbackDeviceID, playback_name);
    jack_info("Separated input = '%s' and output = '%s' devices, create a private aggregate device to handle them...", capture_name, playback_name);
 
    osErr = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyPlugInForBundleID, &outSize, &outWritable);
    if (osErr != noErr) 
        return osErr;

    AudioValueTranslation pluginAVT;

    CFStringRef inBundleRef = CFSTR("com.apple.audio.CoreAudio");
   
    pluginAVT.mInputData = &inBundleRef;
    pluginAVT.mInputDataSize = sizeof(inBundleRef);
    pluginAVT.mOutputData = &fPluginID;
    pluginAVT.mOutputDataSize = sizeof(fPluginID);

    osErr = AudioHardwareGetProperty(kAudioHardwarePropertyPlugInForBundleID, &outSize, &pluginAVT);
    if (osErr != noErr) 
        return osErr;

    //-------------------------------------------------
    // Create a CFDictionary for our aggregate device
    //-------------------------------------------------

    CFMutableDictionaryRef aggDeviceDict = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

    CFStringRef AggregateDeviceNameRef = CFSTR("JackDuplex");
    CFStringRef AggregateDeviceUIDRef = CFSTR("com.grame.JackDuplex");
    
    // add the name of the device to the dictionary
    CFDictionaryAddValue(aggDeviceDict, CFSTR(kAudioAggregateDeviceNameKey), AggregateDeviceNameRef);

    // add our choice of UID for the aggregate device to the dictionary
    CFDictionaryAddValue(aggDeviceDict, CFSTR(kAudioAggregateDeviceUIDKey), AggregateDeviceUIDRef);
    
    // add a "private aggregate key" to the dictionary
    int value = 1;
    CFNumberRef AggregateDeviceNumberRef = CFNumberCreate(NULL, kCFNumberIntType, &value);
    
    SInt32 system;
    Gestalt(gestaltSystemVersion, &system);
     
    jack_log("JackCoreAudioDriver::CreateAggregateDevice : system version = %x limit = %x", system, 0x00001054);
    
    // Starting with 10.5.4 systems, the AD can be internal... (better)
    if (system < 0x00001054) {
        jack_log("JackCoreAudioDriver::CreateAggregateDevice : public aggregate device....");
    } else {
        jack_log("JackCoreAudioDriver::CreateAggregateDevice : private aggregate device....");
        CFDictionaryAddValue(aggDeviceDict, CFSTR(kAudioAggregateDeviceIsPrivateKey), AggregateDeviceNumberRef);
    }
  
    //-------------------------------------------------
    // Create a CFMutableArray for our sub-device list
    //-------------------------------------------------
    
    CFStringRef captureDeviceUID = GetDeviceName(captureDeviceID);
    CFStringRef playbackDeviceUID = GetDeviceName(playbackDeviceID);
    
    if (captureDeviceUID == NULL || playbackDeviceUID == NULL)
        return -1;
  
    // we need to append the UID for each device to a CFMutableArray, so create one here
    CFMutableArrayRef subDevicesArray = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);

    // two sub-devices in this example, so append the sub-device's UID to the CFArray
    CFArrayAppendValue(subDevicesArray, captureDeviceUID);
    CFArrayAppendValue(subDevicesArray, playbackDeviceUID);

    //-----------------------------------------------------------------------
    // Feed the dictionary to the plugin, to create a blank aggregate device
    //-----------------------------------------------------------------------
 
    AudioObjectPropertyAddress pluginAOPA;
    pluginAOPA.mSelector = kAudioPlugInCreateAggregateDevice;
    pluginAOPA.mScope = kAudioObjectPropertyScopeGlobal;
    pluginAOPA.mElement = kAudioObjectPropertyElementMaster;
    UInt32 outDataSize;

    osErr = AudioObjectGetPropertyDataSize(fPluginID, &pluginAOPA, 0, NULL, &outDataSize);
    if (osErr != noErr) 
        return osErr;

    osErr = AudioObjectGetPropertyData(fPluginID, &pluginAOPA, sizeof(aggDeviceDict), &aggDeviceDict, &outDataSize, outAggregateDevice);
    if (osErr != noErr) 
        return osErr;

    // pause for a bit to make sure that everything completed correctly
    // this is to work around a bug in the HAL where a new aggregate device seems to disappear briefly after it is created
    CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, false);

    //-------------------------
    // Set the sub-device list
    //-------------------------

    pluginAOPA.mSelector = kAudioAggregateDevicePropertyFullSubDeviceList;
    pluginAOPA.mScope = kAudioObjectPropertyScopeGlobal;
    pluginAOPA.mElement = kAudioObjectPropertyElementMaster;
    outDataSize = sizeof(CFMutableArrayRef);
    osErr = AudioObjectSetPropertyData(*outAggregateDevice, &pluginAOPA, 0, NULL, outDataSize, &subDevicesArray);
    if (osErr != noErr)
        return osErr;

    // pause again to give the changes time to take effect
    CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, false);

    //-----------------------
    // Set the master device
    //-----------------------

    // set the master device manually (this is the device which will act as the master clock for the aggregate device)
    // pass in the UID of the device you want to use
    pluginAOPA.mSelector = kAudioAggregateDevicePropertyMasterSubDevice;
    pluginAOPA.mScope = kAudioObjectPropertyScopeGlobal;
    pluginAOPA.mElement = kAudioObjectPropertyElementMaster;
    outDataSize = sizeof(CFStringRef);
    osErr = AudioObjectSetPropertyData(*outAggregateDevice, &pluginAOPA, 0, NULL, outDataSize, &captureDeviceUID);  // capture is master...
    if (osErr != noErr) 
        return osErr;

    // pause again to give the changes time to take effect
    CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, false);

    //----------
    // Clean up
    //----------
    
    CFRelease(AggregateDeviceNumberRef);

    // release the CF objects we have created - we don't need them any more
    CFRelease(aggDeviceDict);
    CFRelease(subDevicesArray);

    // release the device UID
    CFRelease(captureDeviceUID);
    CFRelease(playbackDeviceUID);
    
    jack_log("New aggregate device %ld", *outAggregateDevice);
    return noErr;
}
    
bool JackCoreAudioAdapter::IsAggregateDevice(AudioDeviceID device)
{
    OSStatus err = noErr;
    AudioObjectID sub_device[32];
    UInt32 outSize = sizeof(sub_device);
    err = AudioDeviceGetProperty(device, 0, kAudioDeviceSectionGlobal, kAudioAggregateDevicePropertyActiveSubDeviceList, &outSize, sub_device);
    
    if (err != noErr) {
        jack_log("Device does not have subdevices");
        return false;
    } else {
        int num_devices = outSize / sizeof(AudioObjectID);
        jack_log("Device does has %d subdevices", num_devices);
        return true;
    }
}

void JackCoreAudioAdapter::CloseAUHAL()
{
    AudioUnitUninitialize(fAUHAL);
    CloseComponent(fAUHAL);
}

int JackCoreAudioAdapter::Open()
{
    return (AudioOutputUnitStart(fAUHAL) != noErr)  ? -1 : 0;
}

int JackCoreAudioAdapter::Close()
{
#ifdef JACK_MONITOR
    fTable.Save(fHostBufferSize, fHostSampleRate, fAdaptedSampleRate, fAdaptedBufferSize);
#endif
    AudioOutputUnitStop(fAUHAL);
    DisposeBuffers();
    CloseAUHAL();
    RemoveListeners();
    if (fPluginID > 0)
        DestroyAggregateDevice();
    return 0;
}

int JackCoreAudioAdapter::SetSampleRate ( jack_nframes_t sample_rate ) {
    JackAudioAdapterInterface::SetHostSampleRate ( sample_rate );
    Close();
    return Open();
}

int JackCoreAudioAdapter::SetBufferSize ( jack_nframes_t buffer_size ) {
    JackAudioAdapterInterface::SetHostBufferSize ( buffer_size );
    Close();
    return Open();
}

} // namespace

#ifdef __cplusplus
extern "C"
{
#endif

   SERVER_EXPORT jack_driver_desc_t* jack_get_descriptor()
   {
        jack_driver_desc_t *desc;
        unsigned int i;
        desc = (jack_driver_desc_t*)calloc(1, sizeof(jack_driver_desc_t));

        strcpy(desc->name, "audioadapter");                            // size MUST be less then JACK_DRIVER_NAME_MAX + 1
        strcpy(desc->desc, "netjack audio <==> net backend adapter");  // size MUST be less then JACK_DRIVER_PARAM_DESC + 1
     
        desc->nparams = 12;
        desc->params = (jack_driver_param_desc_t*)calloc(desc->nparams, sizeof(jack_driver_param_desc_t));

        i = 0;
        strcpy(desc->params[i].name, "channels");
        desc->params[i].character = 'c';
        desc->params[i].type = JackDriverParamInt;
        desc->params[i].value.ui = -1;
        strcpy(desc->params[i].short_desc, "Maximum number of channels");
        strcpy(desc->params[i].long_desc, "Maximum number of channels. If -1, max possible number of channels will be used");

        i++;
        strcpy(desc->params[i].name, "inchannels");
        desc->params[i].character = 'i';
        desc->params[i].type = JackDriverParamInt;
        desc->params[i].value.ui = -1;
        strcpy(desc->params[i].short_desc, "Maximum number of input channels");
        strcpy(desc->params[i].long_desc, "Maximum number of input channels. If -1, max possible number of input channels will be used");

        i++;
        strcpy(desc->params[i].name, "outchannels");
        desc->params[i].character = 'o';
        desc->params[i].type = JackDriverParamInt;
        desc->params[i].value.ui = -1;
        strcpy(desc->params[i].short_desc, "Maximum number of output channels");
        strcpy(desc->params[i].long_desc, "Maximum number of output channels. If -1, max possible number of output channels will be used");

        i++;
        strcpy(desc->params[i].name, "capture");
        desc->params[i].character = 'C';
        desc->params[i].type = JackDriverParamString;
        strcpy(desc->params[i].value.str, "will take default CoreAudio input device");
        strcpy(desc->params[i].short_desc, "Provide capture ports. Optionally set CoreAudio device name");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "playback");
        desc->params[i].character = 'P';
        desc->params[i].type = JackDriverParamString;
        strcpy(desc->params[i].value.str, "will take default CoreAudio output device");
        strcpy(desc->params[i].short_desc, "Provide playback ports. Optionally set CoreAudio device name");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "rate");
        desc->params[i].character = 'r';
        desc->params[i].type = JackDriverParamUInt;
        desc->params[i].value.ui = 44100U;
        strcpy(desc->params[i].short_desc, "Sample rate");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "periodsize");
        desc->params[i].character = 'p';
        desc->params[i].type = JackDriverParamUInt;
        desc->params[i].value.ui = 512U;
        strcpy(desc->params[i].short_desc, "Period size");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "duplex");
        desc->params[i].character = 'D';
        desc->params[i].type = JackDriverParamBool;
        desc->params[i].value.i = TRUE;
        strcpy(desc->params[i].short_desc, "Provide both capture and playback ports");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "device");
        desc->params[i].character = 'd';
        desc->params[i].type = JackDriverParamString;
        strcpy(desc->params[i].value.str, "will take default CoreAudio device name");
        strcpy(desc->params[i].short_desc, "CoreAudio device name");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

        i++;
        strcpy(desc->params[i].name, "list-devices");
        desc->params[i].character = 'l';
        desc->params[i].type = JackDriverParamBool;
        desc->params[i].value.i = TRUE;
        strcpy(desc->params[i].short_desc, "Display available CoreAudio devices");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
        
        i++;
        strcpy(desc->params[i].name, "quality");
        desc->params[i].character = 'q';
        desc->params[i].type = JackDriverParamInt;
        desc->params[i].value.ui = 0;
        strcpy(desc->params[i].short_desc, "Resample algorithm quality (0 - 4)");
        strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
        
        i++;
        strcpy(desc->params[i].name, "ring-buffer");
        desc->params[i].character = 'g';
        desc->params[i].type = JackDriverParamInt;
        desc->params[i].value.ui = 32768;
        strcpy(desc->params[i].short_desc, "Fixed ringbuffer size");
        strcpy(desc->params[i].long_desc, "Fixed ringbuffer size (if not set => automatic adaptative)");

        return desc;
    }


#ifdef __cplusplus
}
#endif