spectogram-prototype/SpectogramPrototype/ViewController.m

//
//  ViewController.m
//  SpectogramPrototype
//
//  Created by Joshua Moerman on 21/12/13.
//  Copyright (c) 2013 Joshua Moerman. All rights reserved.
//

@import MediaPlayer.MPMediaPickerController;

#import "ViewController.h"
#import "RuledScrollView.h"
#import "Spectographer.h"
#import "Ruler.h"

typedef enum {
	iPad,
	iPod,
	Simulator
} device;

// NOTE: the simulator has no media, so we cant use MPMediaPicker
// and the iPad has to use a popover, while the iPod/iPhone doesn't
// So that's why we check the device
device get_device(){
	device device = iPad;
	
	NSRange range = [[[UIDevice currentDevice] model] rangeOfString:@"Simulator"];
	if(range.location != NSNotFound) {
		device = Simulator;
	}

	if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){
		device = iPod;
	}
	
	return device;
}

@interface ViewController () <MPMediaPickerControllerDelegate> {
	Spectographer * spectographer;
	UIPopoverController * pop;
	NSMutableArray * slices;
}
- (void)openAudioFile:(NSURL*)filePath;
- (void)addSlice:(UIImageView*)view;
- (void)removeAllSlices;
@property (nonatomic, strong) UILabel* header;
@end

@implementation ViewController

@synthesize scrollView, contentView, header;

- (void)viewDidLoad{
	[super viewDidLoad];
	
	if(!contentView){
		[[NSBundle mainBundle] loadNibNamed:@"ContentView" owner:self options:nil];
		[scrollView.content addSubview:contentView];
		contentView.autoresizingMask = UIViewAutoresizingNone;
		scrollView.contentSize = contentView.bounds.size;
	}
	
	if(!slices){
		slices = [[NSMutableArray alloc] init];
	}
}

- (void)didReceiveMemoryWarning{
	[super didReceiveMemoryWarning];
}

- (void)openAudioFile:(NSURL *)filePath{
	[self removeAllSlices];
    [self resetView:nil];
	if(!spectographer)
		spectographer = [[Spectographer alloc] init];
	
	[spectographer openAudioFile:filePath];
	[spectographer generate:^void(CGImageRef image){
		CGImageRetain(image);
		dispatch_async(dispatch_get_main_queue(), ^{
			UIImage * newUIImage = [UIImage imageWithCGImage:image];
			assert(newUIImage);
			CGImageRelease(image);
			
			UIImageView * view = [[UIImageView alloc] initWithImage:newUIImage];
			[self addSlice:view];
		});
	}];
}

- (void)addSlice:(UIImageView *)view{
	if(slices.count){
		UIImageView * lastSlice = slices.lastObject;
		CGFloat x = CGRectGetMaxX(lastSlice.frame);
		view.frame = CGRectOffset(view.frame, x, 0);
	} // else leave the origin at 0
	
	[contentView addSubview:view];
	[slices addObject:view];
    
    view.layer.opacity = 0;
    [UIView animateWithDuration:0.5 animations:^{
        view.layer.opacity = 1;
    }];
	
	UIImageView * lastSlice = slices.lastObject;
	scrollView.contentSize = CGSizeMake(CGRectGetMaxX(lastSlice.frame), CGRectGetMaxY(lastSlice.frame));
}

- (void)removeAllSlices{
	for(UIView * view in slices){
		[view removeFromSuperview];
	}
	[slices removeAllObjects];
	scrollView.contentSize = CGSizeZero;
}

- (void)resetView:(id)__unused sender{
	scrollView.zoomScale = 1.0;
	UIImageView * lastSlice = slices.lastObject;
	scrollView.contentSize = CGSizeMake(CGRectGetMaxX(lastSlice.frame), CGRectGetMaxY(lastSlice.frame));
}

- (void)mediaButtonPressed:(UIButton*)sender{
	MPMediaPickerController * mppc = nil;
	device device = get_device();
	
	switch (device) {
		case iPad:
			mppc = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAnyAudio];
			mppc.delegate = self;
			mppc.allowsPickingMultipleItems = NO;
			mppc.showsCloudItems = NO;
			
			if(pop){
				[pop dismissPopoverAnimated:YES];
				pop = nil;
			}
			
			pop = [[UIPopoverController alloc] initWithContentViewController:mppc];
			[pop presentPopoverFromRect:sender.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
			break;
		case iPod:
			mppc = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAnyAudio];
			mppc.delegate = self;
			mppc.allowsPickingMultipleItems = NO;
			mppc.showsCloudItems = NO;
			
			[self presentViewController:mppc animated:YES completion:nil];
			break;
		case Simulator:
			NSLog(@"WARNING: No MPMediaPicker in Simulator, opening some file");
			[self openAudioFile:[[NSBundle mainBundle] URLForResource:@"testMusic" withExtension:@".mp3"]];
			break;
	}
}

- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {
	for(MPMediaItem * mediaItem in mediaItemCollection.items){
		NSURL * url = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
		[self openAudioFile:url];
	}
	[pop dismissPopoverAnimated:YES];
	pop = nil;
	
	[mediaPicker dismissViewControllerAnimated:YES completion:nil];
}

- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
	[pop dismissPopoverAnimated:YES];
	pop = nil;
	
	[mediaPicker dismissViewControllerAnimated:YES completion:nil];
}

- (void)tuningChanged:(UISlider*)sender{
    [(VerticalRuler*)scrollView.leftRuler setTuning:sender.value];
}

@end