/*

     File: AppController.m 

 Abstract: Demonstrates how to enumerate audio devices attached to the system and how to handle device notification 

  Version: 2.1.1 

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*/

#import <CoreAudio/CoreAudio.h>

#import "AppController.h"

static OSStatus GetAudioDevices( Ptr * devices, UInt16 * devicesAvailable )

{

    OSStatus err = noErr;

    UInt32   theDataSize = 0;

    // find out how many audio devices there are, if any

    AudioObjectPropertyAddress theAddress = { kAudioHardwarePropertyDevices,

                                              kAudioObjectPropertyScopeGlobal,

                                              kAudioObjectPropertyElementMaster };

    err = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &theAddress, 0, NULL, &theDataSize);

    if ( err != noErr ) return err;

    // calculate the number of device available

    *devicesAvailable = theDataSize / (UInt32)sizeof(AudioObjectID);                        

    if ( *devicesAvailable < 1 ) {

        fprintf( stderr, "No devices\n" );

        return err;

    }

    // make space for the devices we are about to get

    if (*devices != NULL) free(*devices);

    *devices = (Ptr)malloc(theDataSize);

    memset( *devices, 0, theDataSize );

    err = AudioObjectGetPropertyData(kAudioObjectSystemObject, &theAddress, 0, NULL, &theDataSize, (void *)*devices);

    return err;

}

OSStatus AOPropertyListenerProc(AudioObjectID inObjectID, UInt32 inNumberAddresses, const AudioObjectPropertyAddress inAddresses[], void* inClientData)

{

    AppController *app = (AppController*)inClientData;

    for (UInt32 x=0; x<inNumberAddresses; x++) {

        switch (inAddresses[x].mSelector)

        {

    /*

     * These are the other types of notifications we might receive, however, they are beyond

     * the scope of this sample and we ignore them.

     *

            case kAudioHardwarePropertyDefaultInputDevice:

                fprintf(stderr, "AOPropertyListenerProc: default input device changed\n");

            break;

            case kAudioHardwarePropertyDefaultOutputDevice:

                fprintf(stderr, "AOPropertyListenerProc: default output device changed\n");

            break;

            case kAudioHardwarePropertyDefaultSystemOutputDevice:

                fprintf(stderr, "AOPropertyListenerProc: default system output device changed\n");

            break;

    */

            case kAudioHardwarePropertyDevices:

            {

                fprintf(stderr, "AOPropertyListenerProc: kAudioHardwarePropertyDevices\n");

                [app performSelectorOnMainThread:@selector(updateDeviceList) withObject:nil waitUntilDone:NO];

            }

            break;

            default:

                fprintf(stderr, "AOPropertyListenerProc: unknown message\n");

            break;

        }

    }

    return noErr;

}

@implementation AppController

-(void) awakeFromNib

{

    // create empty array to hold device info

    deviceArray = [[NSMutableArray alloc] init];

    if(!deviceArray)

        return;

    // generate initial device list

    [self updateDeviceList];

    // install kAudioHardwarePropertyDevices notification listener

    AudioObjectPropertyAddress theAddress = { kAudioHardwarePropertyDevices,

                                              kAudioObjectPropertyScopeGlobal,

                                              kAudioObjectPropertyElementMaster };

    AudioObjectAddPropertyListener(kAudioObjectSystemObject, &theAddress, AOPropertyListenerProc, self);

}

- (void)windowWillClose:(NSNotification *)notification

{

    // remove kAudioHardwarePropertyDevices notification listener

    AudioObjectPropertyAddress theAddress = { kAudioHardwarePropertyDevices,

                                              kAudioObjectPropertyScopeGlobal,

                                              kAudioObjectPropertyElementMaster };

    AudioObjectRemovePropertyListener(kAudioObjectSystemObject, &theAddress, AOPropertyListenerProc, self);

}

- (void)updateDeviceList

{

    OSStatus    err = noErr;

    UInt32      ioSize = 0;

    UInt32      theNumberInputChannels  = 0;

    UInt32      theNumberOutputChannels = 0;

    UInt32      theIndex = 0;

    UInt16      devicesAvailable = 0;

    UInt16      loopCount = 0;

    AudioBufferList *theBufferList = NULL;

    CFNumberRef     tempNumberRef = NULL;

    CFStringRef     tempStringRef = NULL;

    // clear out any current entries in device array

    [deviceArray removeAllObjects];

    // fetch a pointer to the list of available devices

    if(GetAudioDevices((Ptr*)&devices, &devicesAvailable) != noErr)

        return;

    // iterate over each device gathering information

    for(loopCount = 0; loopCount < devicesAvailable; loopCount++)

    {

        CFMutableDictionaryRef theDict = NULL;

        UInt16 deviceID = devices[loopCount];

        // create dictionary to hold device info

        theDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

        if ( theDict == NULL )

        {

            fprintf(stderr, "Dictionary Creation Failed\n" );

            return;

        }

        // save device id

        tempNumberRef = CFNumberCreate(kCFAllocatorDefault,kCFNumberShortType,&deviceID);

        if(tempNumberRef)

        {

            CFDictionarySetValue(theDict, CFSTR("id"), tempNumberRef);

            CFRelease(tempNumberRef);

        }

        // get device name

        AudioObjectPropertyAddress theAddress = { kAudioObjectPropertyName,

                                                  kAudioObjectPropertyScopeGlobal,

                                                  kAudioObjectPropertyElementMaster };

        ioSize = sizeof(CFStringRef);

        err = AudioObjectGetPropertyData(devices[loopCount], &theAddress, 0, NULL, &ioSize, &tempStringRef);

        if(tempStringRef && noErr == err)

        {

            CFDictionarySetValue(theDict, CFSTR("name"), tempStringRef);

            CFRelease(tempStringRef);

        }

        // get number of input channels

        ioSize = 0;

        theNumberInputChannels = 0;

        theAddress.mSelector = kAudioDevicePropertyStreamConfiguration;

        theAddress.mScope =  kAudioObjectPropertyScopeInput;

        theAddress.mElement = 0;

        err = AudioObjectGetPropertyDataSize(devices[loopCount], &theAddress, 0, NULL, &ioSize);

        if((err == noErr) && (ioSize != 0))

        {

            theBufferList = (AudioBufferList*)malloc(ioSize);

            if(theBufferList != NULL)

            {

                // get the input stream configuration

                err = AudioObjectGetPropertyData(devices[loopCount], &theAddress, 0, NULL, &ioSize, theBufferList);

                if(err == noErr)

                {

                    // count the total number of input channels in the stream

                    for(theIndex = 0; theIndex < theBufferList->mNumberBuffers; ++theIndex)

                            theNumberInputChannels += theBufferList->mBuffers[theIndex].mNumberChannels;

                }

                free(theBufferList);

                tempNumberRef = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt32Type,&theNumberInputChannels);

                if(tempNumberRef) {

                    CFDictionarySetValue(theDict, CFSTR("ich"), tempNumberRef);

                    CFRelease(tempNumberRef);

                }

            }

        }

        // get number of output channels

        ioSize = 0;

        theNumberOutputChannels = 0;

        theAddress.mScope = kAudioObjectPropertyScopeOutput;

        err = AudioObjectGetPropertyDataSize(devices[loopCount], &theAddress, 0, NULL, &ioSize);

        if((err == noErr) && (ioSize != 0))

        {

            theBufferList = (AudioBufferList*)malloc(ioSize);

            if(theBufferList != NULL)

            {

                // get the input stream configuration

                err = AudioObjectGetPropertyData(devices[loopCount], &theAddress, 0, NULL, &ioSize, theBufferList);

                if(err == noErr)

                {

                    // count the total number of output channels in the stream

                    for(theIndex = 0; theIndex < theBufferList->mNumberBuffers; ++theIndex)

                            theNumberOutputChannels += theBufferList->mBuffers[theIndex].mNumberChannels;

                }

                free(theBufferList);

                tempNumberRef = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt32Type,&theNumberOutputChannels);

                if(tempNumberRef) {

                    CFDictionarySetValue(theDict, CFSTR("och"), tempNumberRef);

                    CFRelease(tempNumberRef);

                }

            }

        }

        [deviceArray addObject:(NSDictionary*)theDict];

        CFRelease(theDict);

    }

    [myTable reloadData];

}

- (NSUInteger)numberOfRowsInTableView:(NSTableView *)aTableView

{

    return [deviceArray count];

}

- (id)tableView:(NSTableView *)aTableView

      objectValueForTableColumn:(NSTableColumn *)aTableColumn

      row:(int)rowIndex

{

    NSDictionary *deviceDict = NULL;

    deviceDict = [deviceArray objectAtIndex:rowIndex];

    return [deviceDict objectForKey:[aTableColumn identifier]];

}

@end