Adds threading. Uses whole sound

SpectogramPrototype.xcodeproj/project.pbxproj

@@ -25,10 +25,6 @@
 		4261F08818671ECD00AA0EF9 /* ContentView.xib in Resources */ = {isa = PBXBuildFile; fileRef = 4261F08718671ECD00AA0EF9 /* ContentView.xib */; };
 		426665B51869A7CC005D62AC /* RuledScrollView.m in Sources */ = {isa = PBXBuildFile; fileRef = 426665B41869A7CC005D62AC /* RuledScrollView.m */; };
 		426665B81869CEFE005D62AC /* FFTTest.m in Sources */ = {isa = PBXBuildFile; fileRef = 426665B71869CEFE005D62AC /* FFTTest.m */; };
-		426665BA1869CF73005D62AC /* Accelerate.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 426665B91869CF73005D62AC /* Accelerate.framework */; };
-		426665BC1869EF4B005D62AC /* CoreAudio.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 426665BB1869EF4B005D62AC /* CoreAudio.framework */; };
-		426665C11869F194005D62AC /* AudioToolbox.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 426665C01869F194005D62AC /* AudioToolbox.framework */; };
-		426665C51869F50B005D62AC /* MediaPlayer.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 426665C41869F50B005D62AC /* MediaPlayer.framework */; };
 		42ABF54B187035F900B20D82 /* Spectographer.m in Sources */ = {isa = PBXBuildFile; fileRef = 42ABF54A187035F900B20D82 /* Spectographer.m */; };
 		42E12A91186F122400866CB3 /* testMusic.mp3 in Resources */ = {isa = PBXBuildFile; fileRef = 42E12A90186F122400866CB3 /* testMusic.mp3 */; };
 		42E12A94186F1F4C00866CB3 /* AudioFile.m in Sources */ = {isa = PBXBuildFile; fileRef = 42E12A93186F1F4C00866CB3 /* AudioFile.m */; };
@@ -70,10 +66,6 @@
 		426665B41869A7CC005D62AC /* RuledScrollView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RuledScrollView.m; sourceTree = "<group>"; };
 		426665B61869CEFE005D62AC /* FFTTest.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = FFTTest.h; sourceTree = "<group>"; };
 		426665B71869CEFE005D62AC /* FFTTest.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = FFTTest.m; sourceTree = "<group>"; };
-		426665B91869CF73005D62AC /* Accelerate.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Accelerate.framework; path = System/Library/Frameworks/Accelerate.framework; sourceTree = SDKROOT; };
-		426665BB1869EF4B005D62AC /* CoreAudio.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreAudio.framework; path = System/Library/Frameworks/CoreAudio.framework; sourceTree = SDKROOT; };
-		426665C01869F194005D62AC /* AudioToolbox.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AudioToolbox.framework; path = System/Library/Frameworks/AudioToolbox.framework; sourceTree = SDKROOT; };
-		426665C41869F50B005D62AC /* MediaPlayer.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MediaPlayer.framework; path = System/Library/Frameworks/MediaPlayer.framework; sourceTree = SDKROOT; };
 		42ABF549187035F900B20D82 /* Spectographer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Spectographer.h; sourceTree = "<group>"; };
 		42ABF54A187035F900B20D82 /* Spectographer.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Spectographer.m; sourceTree = "<group>"; };
 		42E12A90186F122400866CB3 /* testMusic.mp3 */ = {isa = PBXFileReference; lastKnownFileType = audio.mp3; path = testMusic.mp3; sourceTree = "<group>"; };
@@ -86,10 +78,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				426665C51869F50B005D62AC /* MediaPlayer.framework in Frameworks */,
-				426665C11869F194005D62AC /* AudioToolbox.framework in Frameworks */,
-				426665BC1869EF4B005D62AC /* CoreAudio.framework in Frameworks */,
-				426665BA1869CF73005D62AC /* Accelerate.framework in Frameworks */,
 				424F84AB18661F8000687D3B /* CoreGraphics.framework in Frameworks */,
 				424F84AD18661F8000687D3B /* UIKit.framework in Frameworks */,
 				424F84A918661F8000687D3B /* Foundation.framework in Frameworks */,
@@ -132,10 +120,6 @@
 		424F84A718661F8000687D3B /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
-				426665C41869F50B005D62AC /* MediaPlayer.framework */,
-				426665C01869F194005D62AC /* AudioToolbox.framework */,
-				426665BB1869EF4B005D62AC /* CoreAudio.framework */,
-				426665B91869CF73005D62AC /* Accelerate.framework */,
 				424F84A818661F8000687D3B /* Foundation.framework */,
 				424F84AA18661F8000687D3B /* CoreGraphics.framework */,
 				424F84AC18661F8000687D3B /* UIKit.framework */,
@@ -372,30 +356,48 @@
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_EXPLICIT_OWNERSHIP_TYPE = YES;
+				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_OBJC_RECEIVER_WEAK = YES;
+				CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS = YES;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
+				GCC_WARN_NON_VIRTUAL_DESTRUCTOR = YES;
+				GCC_WARN_PEDANTIC = YES;
+				GCC_WARN_SHADOW = YES;
+				GCC_WARN_SIGN_COMPARE = YES;
+				GCC_WARN_STRICT_SELECTOR_MATCH = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_LABEL = YES;
+				GCC_WARN_UNUSED_PARAMETER = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				ONLY_ACTIVE_ARCH = YES;
+				RUN_CLANG_STATIC_ANALYZER = YES;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -412,23 +414,43 @@
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_EXPLICIT_OWNERSHIP_TYPE = YES;
+				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_OBJC_RECEIVER_WEAK = YES;
+				CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS = YES;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
+				GCC_WARN_NON_VIRTUAL_DESTRUCTOR = YES;
+				GCC_WARN_PEDANTIC = YES;
+				GCC_WARN_SHADOW = YES;
+				GCC_WARN_SIGN_COMPARE = YES;
+				GCC_WARN_STRICT_SELECTOR_MATCH = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_LABEL = YES;
+				GCC_WARN_UNUSED_PARAMETER = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
+				RUN_CLANG_STATIC_ANALYZER = YES;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;

SpectogramPrototype/AppDelegate.m

@@ -9,7 +9,8 @@
 #import "AppDelegate.h"
 
 @implementation AppDelegate
-
+@synthesize window;
+/* Commented out to silence warnings!
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
     // Override point for customization after application launch.
@@ -42,5 +43,5 @@
 {
 	// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
 }
-
+*/
 @end

SpectogramPrototype/AudioFile.m

@@ -7,7 +7,7 @@
 //
 
 #import "AudioFile.h"
-#import <AudioToolbox/ExtendedAudioFile.h>
+@import AudioToolbox.ExtendedAudioFile;
 
 @interface AudioFile (){
 	ExtAudioFileRef audioFile;
@@ -76,14 +76,14 @@
 	short * buffer = bufferList.mBuffers[0].mData;
 	float * leftEnd = left + nSamples;
 	for(unsigned int i = 0; i < nFrames; ++i){
-		*left++ = *buffer++ / 32768.0;
+		*left++ = *buffer++ / 32768.0f;
-		*right++ = *buffer++ / 32768.0;
+		*right++ = *buffer++ / 32768.0f;
 	}
 	
 	// assume left and right are of the same size
 	while(left != leftEnd){
-		*left++ = 0.0;
+		*left++ = 0;
-		*right++ = 0.0;
+		*right++ = 0;
 	}
 	
 	free(bufferList.mBuffers[0].mData);

SpectogramPrototype/Base.lproj/Main_iPad.storyboard

@@ -21,8 +21,8 @@
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <color key="backgroundColor" red="0.40000000600000002" green="1" blue="0.40000000600000002" alpha="1" colorSpace="calibratedRGB"/>
                             </scrollView>
-                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="kj8-JR-vKG">
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="kj8-JR-vKG">
-                                <rect key="frame" x="200" y="300" width="111" height="42"/>
+                                <rect key="frame" x="20" y="40" width="60" height="39"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="22"/>
                                 <state key="normal" title="Media">
@@ -32,12 +32,27 @@
                                     <action selector="mediaButtonPressed:" destination="DUW-zh-mwd" eventType="touchUpInside" id="hZd-Q2-HcR"/>
                                 </connections>
                             </button>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="FQ1-hk-Tya">
+                                <rect key="frame" x="100" y="40" width="108" height="39"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="22"/>
+                                <state key="normal" title="Reset View">
+                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                                </state>
+                                <connections>
+                                    <action selector="resetView:" destination="DUW-zh-mwd" eventType="touchUpInside" id="xv9-4L-1Ve"/>
+                                </connections>
+                            </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                         <constraints>
+                            <constraint firstItem="kj8-JR-vKG" firstAttribute="top" secondItem="n1Z-VL-Qbf" secondAttribute="bottom" constant="20" id="0K2-Le-fIA"/>
                             <constraint firstAttribute="trailing" secondItem="chg-BV-Ue8" secondAttribute="trailing" id="0fj-54-kGr"/>
+                            <constraint firstItem="FQ1-hk-Tya" firstAttribute="centerY" secondItem="kj8-JR-vKG" secondAttribute="centerY" id="JB3-Mj-mXd"/>
                             <constraint firstItem="chg-BV-Ue8" firstAttribute="top" secondItem="hed-94-g1X" secondAttribute="top" id="OzJ-ZW-YG0"/>
+                            <constraint firstItem="kj8-JR-vKG" firstAttribute="leading" secondItem="hed-94-g1X" secondAttribute="leading" constant="20" id="QYP-WV-LmJ"/>
                             <constraint firstAttribute="bottom" secondItem="chg-BV-Ue8" secondAttribute="bottom" id="Sc7-ra-bZs"/>
+                            <constraint firstItem="FQ1-hk-Tya" firstAttribute="leading" secondItem="kj8-JR-vKG" secondAttribute="trailing" constant="20" id="X8X-id-l6J"/>
                             <constraint firstItem="chg-BV-Ue8" firstAttribute="leading" secondItem="hed-94-g1X" secondAttribute="leading" id="vH2-JI-XSk"/>
                         </constraints>
                     </view>

SpectogramPrototype/FFTTest.h

@@ -10,5 +10,5 @@
 
 @interface FFTTest : NSObject
 - (void) inPlaceFFT:(float*)data forSize:(unsigned int)n;
-@property (readonly) unsigned int acceptedSize;
+@property (nonatomic, readonly) unsigned int acceptedSize;
 @end

SpectogramPrototype/FFTTest.m

@@ -7,7 +7,7 @@
 //
 
 #import "FFTTest.h"
-#import <Accelerate/Accelerate.h>
+@import Accelerate;
 
 @interface FFTTest () {
 	FFTSetup setup;

SpectogramPrototype/RuledScrollView.m

@@ -69,7 +69,7 @@
 - (void)placeTicks {
 	[topRuler.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
 	CGFloat spacing = 600.0f;
-	for (CGFloat x = rulerWidth + 0.5*spacing; x < topRuler.frame.size.width; x += spacing){
+	for (CGFloat x = rulerWidth + 0.5f*spacing; x < topRuler.frame.size.width; x += spacing){
 		UIView * line = [[UIView alloc] initWithFrame:CGRectMake(x, 0, 1, rulerHeight)];
 		line.backgroundColor = [UIColor blackColor];
 		[topRuler addSubview:line];
@@ -83,6 +83,7 @@
 }
 
 - (void)layoutSubviews {
+	[super layoutSubviews];
 	{
 		CGRect frame = self.topRuler.frame;
 		frame.origin.y = self.contentOffset.y;
@@ -103,7 +104,7 @@
 	leftRuler.frame = CGRectMake(0, 0, rulerWidth, contentSize.height + rulerHeight);
 }
 
-- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
+- (UIView *)viewForZoomingInScrollView:(UIScrollView *)__unused scrollView{
 	return content;
 }
 

SpectogramPrototype/Spectographer.h

@@ -11,6 +11,6 @@
 @interface Spectographer : NSObject
 
 - (void)openAudioFile:(NSURL*)url;
-- (CGImageRef)generate;
+- (void)generate:(void (^)(CGImageRef))callback;
 
 @end

SpectogramPrototype/Spectographer.m

@@ -10,10 +10,10 @@
 #import "FFTTest.h"
 #import "AudioFile.h"
 
-UInt8 clamp_to_uint8(float x){
+uint8_t clamp_to_uint8(float x){
 	if(x >= 1.0) return 255;
 	if(x <= 0.0) return 0;
-	return 255.0 * x;
+	return (uint8_t)(255.0f * x);
 }
 
 @interface Spectographer (){
@@ -22,7 +22,8 @@ UInt8 clamp_to_uint8(float x){
 	float * left;
 	float * right;
 }
-
+- (void)threadTask:(void (^)(CGImageRef))callback;
+- (CGImageRef)singleStep CF_RETURNS_RETAINED;
 @end
 
 @implementation Spectographer
@@ -41,25 +42,43 @@ UInt8 clamp_to_uint8(float x){
 	assert(audioFile);
 }
 
-- (CGImageRef)generate{
+- (void)generate:(void (^)(CGImageRef))callback{
+	[NSThread detachNewThreadSelector:@selector(threadTask:) toTarget:self withObject:callback];
+}
+
+- (void)threadTask:(void (^)(CGImageRef))callback{
+	CGImageRef cgImage = nil;
+	while((cgImage = [self singleStep])){
+		callback(cgImage);
+		CGImageRelease(cgImage);
+	}
+}
+
+- (CGImageRef)singleStep{
 	unsigned int size = FFTHandler.acceptedSize;
-	unsigned int width = size/4;
+	unsigned int width = 128;
 	unsigned int height = size/8;
 	
-	char * rgba = calloc(width*height*4, sizeof(char));
+	uint8_t * rgba = calloc(width*height*4, sizeof(uint8_t));
 	
-	for(unsigned int x = 0; x < width; ++x){
+	unsigned int x = 0;
-		[audioFile fillLeft:left andRight:right withNumberOfSamples:size];
+	for(; x < width; ++x){
+		if(![audioFile fillLeft:left andRight:right withNumberOfSamples:size])
+			break;
 		[FFTHandler inPlaceFFT:left forSize:size];
 		[FFTHandler inPlaceFFT:right forSize:size];
 		for(unsigned int y = 0; y < height; ++y){
 			unsigned int yy = height - y - 1;
-			rgba[4*width*yy + 4*x + 0] = clamp_to_uint8(100.0 * left[y]);
+			rgba[4*width*yy + 4*x + 0] = clamp_to_uint8(100.0f * left[y]);
-			rgba[4*width*yy + 4*x + 1] = clamp_to_uint8(100.0 * right[y]);
+			rgba[4*width*yy + 4*x + 1] = clamp_to_uint8(100.0f * right[y]);
-			rgba[4*width*yy + 4*x + 2] = clamp_to_uint8(10.0 * (left[y] + right[y]));
+			rgba[4*width*yy + 4*x + 2] = clamp_to_uint8(10.0f * (left[y] + right[y]));
 			rgba[4*width*yy + 4*x + 3] = 0;
 		}
 	}
+	if(!x){
+		free(rgba);
+		return nil;
+	}
 	
 	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
 	assert(colorSpace);

SpectogramPrototype/ViewController.h

@@ -15,6 +15,7 @@
 @property (nonatomic) IBOutlet RuledScrollView * scrollView;
 @property (nonatomic) IBOutlet UIView * contentView;
 
-- (IBAction) mediaButtonPressed:(UIButton*)sender;
+- (IBAction)mediaButtonPressed:(UIButton*)sender;
+- (IBAction)resetView:(id)sender;
 
 @end

SpectogramPrototype/ViewController.m

@@ -6,8 +6,7 @@
 //  Copyright (c) 2013 Joshua Moerman. All rights reserved.
 //
 
-#import <MediaPlayer/MPMediaPickerController.h>
+@import MediaPlayer.MPMediaPickerController;
-#import <AudioToolbox/ExtendedAudioFile.h>
 
 #import "ViewController.h"
 #import "RuledScrollView.h"
@@ -40,8 +39,11 @@ device get_device(){
 @interface ViewController () <MPMediaPickerControllerDelegate> {
 	Spectographer * spectographer;
 	UIPopoverController * pop;
+	NSMutableArray * slices;
 }
-- (void) openAudioFile:(NSURL*)filePath;
+- (void)openAudioFile:(NSURL*)filePath;
+- (void)addSlice:(UIImageView*)view;
+- (void)removeAllSlices;
 @property (nonatomic, strong) UILabel* header;
 @end
 
@@ -58,6 +60,10 @@ device get_device(){
 		contentView.autoresizingMask = UIViewAutoresizingNone;
 		scrollView.contentSize = contentView.bounds.size;
 	}
+	
+	if(!slices){
+		slices = [[NSMutableArray alloc] init];
+	}
 }
 
 - (void)didReceiveMemoryWarning{
@@ -65,26 +71,58 @@ device get_device(){
 }
 
 - (void)openAudioFile:(NSURL *)filePath{
+	[self removeAllSlices];
 	if(!spectographer)
 		spectographer = [[Spectographer alloc] init];
 	
 	[spectographer openAudioFile:filePath];
-	CGImageRef image = [spectographer generate];
+	[spectographer generate:^void(CGImageRef image){
-	
+		CGImageRetain(image);
-	UIImage * newUIImage = [UIImage imageWithCGImage:image];
+		dispatch_async(dispatch_get_main_queue(), ^{
-	assert(newUIImage);
+			UIImage * newUIImage = [UIImage imageWithCGImage:image];
+			assert(newUIImage);
+			CGImageRelease(image);
+			
+			UIImageView * view = [[UIImageView alloc] initWithImage:newUIImage];
+			[self addSlice:view];
+		});
+	}];
 	
-	CGImageRelease(image);
+//	[contentView removeFromSuperview];
+//	contentView = view;
+//	scrollView.zoomScale = 1.0;
+//	
+//	[scrollView.content addSubview:contentView];
+//	contentView.autoresizingMask = UIViewAutoresizingNone;
+//	scrollView.contentSize = contentView.bounds.size;
+}
+
+- (void)addSlice:(UIImageView *)view{
+	if(slices.count){
+		UIImageView * lastSlice = slices.lastObject;
+		float x = CGRectGetMaxX(lastSlice.frame);
+		view.frame = CGRectOffset(view.frame, x, 0);
+	} // else leave the origin at 0
 	
-	UIImageView * view = [[UIImageView alloc] initWithImage:newUIImage];
+	[contentView addSubview:view];
+	[slices addObject:view];
 	
-	[contentView removeFromSuperview];
+	UIImageView * lastSlice = slices.lastObject;
-	contentView = view;
+	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.content addSubview:contentView];
+	scrollView.contentSize = CGSizeMake(CGRectGetMaxX(lastSlice.frame), CGRectGetMaxY(lastSlice.frame));
-	contentView.autoresizingMask = UIViewAutoresizingNone;
-	scrollView.contentSize = contentView.bounds.size;
 }
 
 - (void)mediaButtonPressed:(UIButton*)sender{
@@ -128,11 +166,15 @@ device get_device(){
 	}
 	[pop dismissPopoverAnimated:YES];
 	pop = nil;
+	
+	[mediaPicker dismissViewControllerAnimated:YES completion:nil];
 }
 
 - (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
 	[pop dismissPopoverAnimated:YES];
 	pop = nil;
+	
+	[mediaPicker dismissViewControllerAnimated:YES completion:nil];
 }
 
 @end