#include <AudioToolbox/AudioToolbox.h>

#import "AppDelegate.h"

static void CheckResult(OSStatus result, const char *operation) {
    if (result == noErr) return;
    char errorString[20];
    *(UInt32 *)(errorString + 1) = CFSwapInt32HostToBig(result);
    if (isprint(errorString[1]) && isprint(errorString[2]) &&
        isprint(errorString[3]) && isprint(errorString[4])) {
        errorString[0] = errorString[5] = '\'';
        errorString[6] = '\0';
    } else {
        sprintf(errorString, "%d", (int)result);
    }
    fprintf(stderr, "Error: %s (%s)\n", operation, errorString);
    exit(1);
}

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

        AudioUnit _outputUnit;

        // set up output unit and callback
        AudioComponentDescription outputcd = {0};
        outputcd.componentType = kAudioUnitType_Output;
        outputcd.componentSubType = kAudioUnitSubType_DefaultOutput;
        outputcd.componentManufacturer = kAudioUnitManufacturer_Apple;

        AudioComponent comp = AudioComponentFindNext(NULL, &outputcd);
        if (comp == NULL) {
                printf("can't get output unit");
                exit(-1);
        }
        AudioComponentDescription outDesc;
        AudioComponentGetDescription(comp, &outDesc);
        CheckResult(AudioComponentInstanceNew(comp, &_outputUnit),
            "Couldn't open component for outputUnit");
}

@end