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import sys
import time
from subprocess import Popen
from watchdog.observers import Observer
from watchdog.events import RegexMatchingEventHandler


class IpaDirectoryEventHandler(RegexMatchingEventHandler):

    def on_modified(self, event):

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first public gist

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AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix];
exportAudioMix.inputParameters = parameters;

AVAssetExportSession *export =
        [[AVAssetExportSession alloc] initWithAsset:mixComposition
                                         presetName:AVAssetExportPresetAppleM4A];
export.outputFileType = @"com.apple.m4a-audio";
export.outputURL      = outputFileUrl;
export.audioMix       = exportAudioMix;

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CMTimeRange fadeInRange = CMTimeRangeMake(CMTimeMake(0, 1), CMTimeMake(self.fadeInToSec, 1));
[fadeInParameter setVolumeRampFromStartVolume:0.0 toEndVolume:1.0
                                    timeRange:fadeInRange]; 

[parameters addObject:fadeInParameter];

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OSStatus 
MyAudioCallback(AudioConverterRef inAudioConverter,
                         UInt32 *ioDataPacketCount,
                         AudioBufferList *ioData,
                         AudioStreamPacketDescription **outDataPacketDescription,
                         void *inUserData);

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UInt32 allowMixing = NO;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, 
                        sizeof (allowMixing), 
                        &allowMixing);

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 AudioSessionInitialize(NULL, 
                        NULL, 
                        InterruptionListenerCallback,
                        clientData);

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@interface MediaPicker()
@property (nonatomic, retain) MPMediaPickerController *picker;
@end
 
@implementation PYSMediaPicker 

@synthesize picker;
@synthesize delegate;
 

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- (void)presentPicker
{
    [Flurry logEvent:@"Picker presented"];

    self.picker =
            [[[MPMediaPickerController alloc]
                    initWithMediaTypes: MPMediaTypeAnyAudio] autorelease];
    [picker setDelegate:self];
    [picker setAllowsPickingMultipleItems:NO];
    picker.prompt = @"Choose sound to process";

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// Here a cave in which live all runtime dragons and wizards
#include <objc/runtime.h>

// We can swap instance methods, they start with '-' minus sign, you know
static void instance_methods_swap(id object, SEL firstSel, SEL secondSel) {
    method_exchangeImplementations(
        class_getInstanceMethod(object, firstSel),
        class_getInstanceMethod(object, secondSel));
}