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iPodLibraryAccessViewController.m
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iPodLibraryAccessViewController.m
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//
// iPodLibraryAccessViewController.m
// iPodLibraryAccess
//
// Created by Art Gillespie on 6/11/10.
// Copyright Glaresoft 2010. All rights reserved.
//
#import "iPodLibraryAccessViewController.h"
#import <AudioToolbox/AudioToolbox.h>
@implementation iPodLibraryAccessViewController
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath compare:@"status"] == 0) {
AVAssetExportSession* export = (AVAssetExportSession*)object;
switch (export.status) {
case AVAssetExportSessionStatusUnknown:
NSLog(@"AVAssetExportSessionStatusUnknown");
break;
case AVAssetExportSessionStatusExporting:
NSLog(@"AVAssetExportSessionStatusExporting");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"AVAssetExportSessionStatusCompleted");
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"AVAssetExportSessionStatusFailed");
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"AVAssetExportSessionStatusCancelled");
break;
case AVAssetExportSessionStatusWaiting:
NSLog(@"AVAssetExportSessionStatusWaiting");
break;
default:
break;
}
}
}
- (void)viewDidLoad {
[super viewDidLoad];
[progressView setProgress:0.f];
AVAudioSession* session = [AVAudioSession sharedInstance];
NSError* error = nil;
// Thought maybe setting this to one of the "exclusive" categories
// would give us faster results, e.g., by granting us access to the
// hardware encoder, but with any other category, you get -11820 errors
// from AVAssetExportSession
if(![session setCategory:AVAudioSessionCategoryAmbient error:&error]) {
NSLog(@"Couldn't set audio session category: %@", error);
}
if(![session setActive:YES error:&error]) {
NSLog(@"Couldn't make audio session active: %@", error);
}
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)progressTimer:(NSTimer*)timer {
AVAssetExportSession* export = (AVAssetExportSession*)timer.userInfo;
switch (export.status) {
case AVAssetExportSessionStatusExporting:
{
NSTimeInterval delta = [NSDate timeIntervalSinceReferenceDate] - startTime;
float minutes = rintf(delta/60.f);
float seconds = rintf(fmodf(delta, 60.f));
[elapsedLabel setText:[NSString stringWithFormat:@"%2.0f:%02.0f", minutes, seconds]];
[progressView setProgress:export.progress];
break;
}
case AVAssetExportSessionStatusCancelled:
case AVAssetExportSessionStatusCompleted:
case AVAssetExportSessionStatusFailed:
[timer invalidate];
break;
default:
break;
}
}
- (void)dumpAsset:(AVURLAsset*)asset {
NSLog(@"asset.url: %@", asset.URL);
for (AVMetadataItem* item in asset.commonMetadata) {
NSLog(@"metadata: %@", item);
}
for (AVAssetTrack* track in asset.tracks) {
NSLog(@"track.id: %d", track.trackID);
NSLog(@"track.mediaType: %@", track.mediaType);
CMFormatDescriptionRef fmt = [track.formatDescriptions objectAtIndex:0];
AudioStreamBasicDescription* desc = CMAudioFormatDescriptionGetStreamBasicDescription(fmt);
NSLog(@"track.enabled: %d", track.enabled);
NSLog(@"track.selfContained: %d", track.selfContained);
}
}
- (void)openURL:(NSURL*)assetURL {
AudioFileID audioFile;
OSStatus err = AudioFileOpenURL((CFURLRef)assetURL, 0x01, 0, &audioFile);
if (noErr != err) {
NSLog(@"couldn't open url: %d", err);
}
}
- (void)exportAssetAtURL:(NSURL*)assetURL {
NSDictionary * options = [[NSDictionary alloc] init];
AVURLAsset* asset = [AVURLAsset URLAssetWithURL:assetURL options:options];
//[self dumpAsset:asset];
//[self openURL:assetURL];
/*
player = [[AVPlayer alloc] initWithURL:assetURL];
if (!player) {
NSLog(@"couldn't init AVPlayer!");
}
[player play];
*/
// create an export session to write the asset as an m4a
// I've tried AVAssetExportPresetPassthrough hoping that we could just stuff
// the audio into a .caf in whatever format it appears in the iPod Library, but
// couldn't get it to work.
//
NSLog(@"preset: %@", AVAssetExportPresetAppleM4A);
NSArray *presets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
for (NSString* preset in presets) {
NSLog(@"preset: %@", preset);
}
AVAssetExportSession* export = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
for (NSString* type in export.supportedFileTypes) {
NSLog(@"type: %@", type);
}
//set the export session's outputURL to <Documents>/test.m4a
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSURL* outURL = [NSURL fileURLWithPath:[documentsDirectory stringByAppendingPathComponent:@"test.mov"]];
[[NSFileManager defaultManager] removeItemAtURL:outURL error:nil];
export.outputURL = outURL;
//set the output file type
//this doesn't like anything other than AVFileTypeAppleM4A
//it seems we should be able to specify AVFileTypeCoreAudioFormat (with AVAssetExportPresetPassthrough?) to skip
//the encoding step, but fuck you very much.
// Passthrough Preset
// mp3 -> test.wav/AVFileTypeWAVE == fails silently
// mp3 -> test.mp4/AVFileTypeMPEG4 == fails with -11820 "Cannot complete export"
// mp3 -> test.m4a/AVFileTypeAppleM4A == fails with -11820 "Cannot complete export'
// mp3 -> test.aif/AVFileTypeAIFF == fails silently, 0-length file
// mp3 -> test.aifc/AVFileTypeAIFC == fails silently, 0-length file
// mp3 -> test.mov/
export.outputFileType = AVFileTypeQuickTimeMovie;
[export addObserver:self forKeyPath:@"status" options:0 context:nil];
[export addObserver:self forKeyPath:@"progress" options:0 context:nil];
startTime = [NSDate timeIntervalSinceReferenceDate];
[NSTimer scheduledTimerWithTimeInterval:.25 target:self selector:@selector(progressTimer:) userInfo:export repeats:YES];
[export exportAsynchronouslyWithCompletionHandler:^(void) {
if (export.status == AVAssetExportSessionStatusFailed) {
NSLog(@"export.error: %@", export.error);
} else if (export.status == AVAssetExportSessionStatusCancelled) {
NSLog(@"export canceeld: %@", export.error);
} else {
NSLog(@"export complete!");
player = [[AVPlayer alloc] initWithURL:outURL];
if (!player) {
NSLog(@"couldn't create player!");
}
[player play];
if (player.status == AVPlayerStatusFailed) {
NSLog(@"AVPlayer Failed: %@", player.error);
}
AudioFileID audioFile;
OSStatus err = AudioFileOpenURL((CFURLRef)outURL, 0x01, 0, &audioFile);
NSLog(@"err: %d", err);
}
[export release];
}];
}
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker
didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {
[self dismissModalViewControllerAnimated:YES];
for (MPMediaItem* item in mediaItemCollection.items) {
NSString* title = [item valueForProperty:MPMediaItemPropertyTitle];
NSURL* assetURL = [item valueForProperty:MPMediaItemPropertyAssetURL];
NSLog(@"title: %@, url: %@", title, assetURL);
[self exportAssetAtURL:assetURL];
}
}
- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
[self dismissModalViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)showMediaPicker {
MPMediaPickerController* mediaPicker = [[[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic] autorelease];
mediaPicker.delegate = self;
[self presentModalViewController:mediaPicker animated:YES];
}
- (IBAction)pickSong:(id)sender {
[self showMediaPicker];
}
- (void)dealloc {
[super dealloc];
}
@end