/*

Copyright (C) 2016 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

Part of Core Audio AUBase Classes

*/

#include "AUBaseHelper.h"

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

    #include <AudioUnit/AudioUnitProperties.h>

#else

    #include <AudioUnitProperties.h>

#endif

OSStatus    GetFileRefPath (CFDictionaryRef parent, CFStringRef frKey, CFStringRef * fPath)

{   

    static CFStringRef kFRString = CFSTR (kAUPresetExternalFileRefs);

    const void* frVal = CFDictionaryGetValue(parent, kFRString);

    if (!frVal) return kAudioUnitErr_InvalidPropertyValue;

    const void* frString = CFDictionaryGetValue ((CFDictionaryRef)frVal, frKey);

    if (!frString) return kAudioUnitErr_InvalidPropertyValue;

    if (fPath)

        *fPath = (CFStringRef)frString;

    return noErr;

}

CFMutableDictionaryRef CreateFileRefDict (CFStringRef fKey, CFStringRef fPath, CFMutableDictionaryRef fileRefDict)

{

    if (!fileRefDict)

        fileRefDict = CFDictionaryCreateMutable (NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

    CFDictionarySetValue (fileRefDict, fKey, fPath);

    return fileRefDict;

}

#if TARGET_OS_MAC

// check if the URL can be accessed for reading/writing.  Returns 0 if yes, or the error value.

int AccessURLAsset(const CFURLRef inURL, int mode)

{

    char path[PATH_MAX];

    if (CFURLGetFileSystemRepresentation(inURL, TRUE, (UInt8 *)path, PATH_MAX) == FALSE)

        return kAudio_FileNotFoundError;

    // check whether we have access

    int ret = access(path, mode);

//  syslog(LOG_CRIT, "access() error is %d for \"%s\".\n", ret, path);

    if (ret == 0) return 0;

    switch (errno) {

        case EACCES:

        case EPERM:

            return -54; /*permission denied error*/

        case ENOENT:

        case ENOTDIR:

        case ELOOP:

            return kAudio_FileNotFoundError;

        default:

            return errno;

    }

}

#endif

#if DEBUG

//_____________________________________________________________________________

//

void PrintAUParamEvent (AudioUnitParameterEvent& event, FILE* f)

{

        bool isRamp = event.eventType == kParameterEvent_Ramped;

        fprintf (f, "\tParamID=%ld,Scope=%ld,Element=%ld\n", (long)event.parameter, (long)event.scope, (long)event.element);

        fprintf (f, "\tEvent Type:%s,", (isRamp ? "ramp" : "immediate"));

        if (isRamp)

            fprintf (f, "start=%ld,dur=%ld,startValue=%f,endValue=%f\n",

                    (long)event.eventValues.ramp.startBufferOffset, (long)event.eventValues.ramp.durationInFrames, 

                    event.eventValues.ramp.startValue, event.eventValues.ramp.endValue);

        else

            fprintf (f, "start=%ld,value=%f\n", 

                    (long)event.eventValues.immediate.bufferOffset, 

                    event.eventValues.immediate.value);

        fprintf (f, "- - - - - - - - - - - - - - - -\n");

}

#endif