私はかなり長い間この問題に苦しんできました。
プレイリストを含み、アプリケーション内に保存されている音楽ファイルのみを再生するプレーヤーを作成しようとしています。
現在、AVAudioPlayer を使用して mp3 ファイルを再生しています。私の問題は、プレイリストをロードするときに、前の mp3 の再生を停止できないため、最初のオーディオと、プレイリストからロードした他のすべてのオーディオ ファイルの間でサウンドが混在することです。
だから、ここに私のコードがあります：
#import "MainViewController.h"
#import <Foundation/Foundation.h>
#pragma mark Audio session callbacks_______________________
@implementation MainViewController
@synthesize artworkItem;
@synthesize userMediaItemCollection;
@synthesize playBarButton;
@synthesize pauseBarButton;
@synthesize musicPlayer;
@synthesize navigationBar;
@synthesize noArtworkImage;
@synthesize backgroundColorTimer;
@synthesize nowPlayingLabel, AudFile;
@synthesize appSoundButton;
@synthesize addOrShowMusicButton;
@synthesize appSoundPlayer;
@synthesize soundFileURL;
@synthesize interruptedOnPlayback;
@synthesize playedMusicOnce;
@synthesize playing;
#pragma mark Music control________________________________
- (IBAction) playOrPauseMusic: (id)sender {
}
- (IBAction) AddMusicOrShowMusic: (id) sender {
[audioPlayer stop];
// Load the Playlist direcly
MusicTableViewController *controller = [[MusicTableViewController alloc] initWithNibName: @"MusicTableView" bundle: nil];
controller.delegate = self;
controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController: controller animated: YES];
[controller release];
}
#pragma mark Application playback control_________________
- (IBAction) playAppSound: (id) sender {
// [appSoundPlayer play];
// playing = YES;
// [appSoundButton setEnabled: NO];
}
// delegate method for the audio route change alert view; follows the protocol specified
// in the UIAlertViewDelegate protocol.
- (void) alertView: routeChangeAlertView clickedButtonAtIndex: buttonIndex {
if ((NSInteger) buttonIndex == 1) {
[appSoundPlayer play];
} else {
[appSoundPlayer setCurrentTime: 0];
[appSoundButton setEnabled: YES];
}
[routeChangeAlertView release];
}
#pragma mark AV Foundation delegate methods____________
- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) appSoundPlayer successfully: (BOOL) flag {
}
- (void) audioPlayerBeginInterruption: player {
}
- (void) audioPlayerEndInterruption: player {
}
#pragma mark Table view delegate methods________________
// Invoked when the user taps the Done button in the table view.
- (void) musicTableViewControllerDidFinish: (MusicTableViewController *) controller {
[self dismissModalViewControllerAnimated: YES];
}
#pragma mark Application setup____________________________
#if TARGET_IPHONE_SIMULATOR
#warning *** Simulator mode: iPod library access works only when running on a device.
#endif
//play audio 2
- (void)playAudio2:(NSString*) name type:(NSString*)type
{
[self stopAudio];
[audioPlayer stop];
[audioPlayer release];
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:name
ofType:type]];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc]
initWithContentsOfURL:url
error:&error];
if (error)
{
NSLog(@"Error in audioPlayer: %@",
[error localizedDescription]);
} else {
audioPlayer.delegate = self;
[audioPlayer prepareToPlay];
}
[audioPlayer play];
}
-(void)playAudio
{
[appSoundPlayer play];
}
- (void)stopAudio
{
[appSoundPlayer stop];
}
// Configure the application.
- (void) viewDidLoad {
[super viewDidLoad];
[self setPlayedMusicOnce: NO];
[self setNoArtworkImage: [UIImage imageNamed: @"no_artwork.png"]];
[self setPlayBarButton: [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemPlay
target: self
action: @selector (playOrPauseMusic:)]];
[self setPauseBarButton: [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemPause
target: self
action: @selector (playOrPauseMusic:)]];
[addOrShowMusicButton setTitle: NSLocalizedString (@"Add Music", @"Title for 'Add Music' button, before user has chosen some music")
forState: UIControlStateNormal];
[appSoundButton setTitle: NSLocalizedString (@"Play App Sound", @"Title for 'Play App Sound' button")
forState: UIControlStateNormal];
[nowPlayingLabel setText: NSLocalizedString (@"Instructions", @"Brief instructions to user, shown at launch")];
// Configure a timer to change the background color. The changing color represents an
// application that is doing something else while iPod music is playing.
[self setBackgroundColorTimer: [NSTimer scheduledTimerWithTimeInterval: 3.5
target: self
selector: @selector (updateBackgroundColor)
userInfo: nil
repeats: YES]];
[self setupAudioSession];
}
// Invoked by the backgroundColorTimer.
- (void) updateBackgroundColor {
[UIView beginAnimations: nil context: nil];
[UIView setAnimationDuration: 3.0];
CGFloat redLevel = rand() / (float) RAND_MAX;
CGFloat greenLevel = rand() / (float) RAND_MAX;
CGFloat blueLevel = rand() / (float) RAND_MAX;
self.view.backgroundColor = [UIColor colorWithRed: redLevel
green: greenLevel
blue: blueLevel
alpha: 1.0];
[UIView commitAnimations];
}
#pragma mark Application state management_____________
- (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) setupAudioSession
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *setCategoryError = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];
if (setCategoryError){/* Handle Error COndition*/}
NSError *activationError = nil;
[audioSession setActive:YES error:&activationError];
if (activationError){
/*handle error*/
}
}
// just for test , delete after
-(void) myInstanceMethod: (id)sender{
[self setupAudioSession];
[audioPlayer stop];
[audioPlayer release];
AudFile = sender;
NSLog(@"My Instance metthod called ok with item : %@", sender);
[self playAudio2:[NSString stringWithFormat:@"%@",AudFile] type:@"mp3"];
//[self setupApplicationAudio: sender];
NSLog(@"New Audfile is: %@", AudFile);
// [self setupApplicationAudio];
}
+(void) myClassMethod{
NSLog(@"Class Called ok");
}
- (void)dealloc {
/*
// This sample doesn't use libray change notifications; this code is here to show how
// it's done if you need it.
[[NSNotificationCenter defaultCenter] removeObserver: self
name: MPMediaLibraryDidChangeNotification
object: musicPlayer];
[[MPMediaLibrary defaultMediaLibrary] endGeneratingLibraryChangeNotifications];
*/
[[NSNotificationCenter defaultCenter] removeObserver: self
name: MPMusicPlayerControllerNowPlayingItemDidChangeNotification
object: musicPlayer];
[[NSNotificationCenter defaultCenter] removeObserver: self
name: MPMusicPlayerControllerPlaybackStateDidChangeNotification
object: musicPlayer];
[musicPlayer endGeneratingPlaybackNotifications];
[musicPlayer release];
[artworkItem release];
[backgroundColorTimer invalidate];
[backgroundColorTimer release];
[navigationBar release];
[noArtworkImage release];
[nowPlayingLabel release];
[pauseBarButton release];
[playBarButton release];
[soundFileURL release];
[userMediaItemCollection release];
[super dealloc];
}
プレイリストからプレーヤーにファイル名を送信しています
-(void) myInstanceMethod: (id)sender{
[self setupAudioSession];
[audioPlayer stop];
[audioPlayer release];
AudFile = sender;
NSLog(@"My Instance metthod called ok with item : %@", sender);
[self playAudio2:[NSString stringWithFormat:@"%@",AudFile] type:@"mp3"];
//[self setupApplicationAudio: sender];
NSLog(@"New Audfile is: %@", AudFile);
// [self setupApplicationAudio];
}
メソッドで UIModalTransition を使用して、mainviewcontroller からプレイリストをロードします。
- (IBAction) AddMusicOrShowMusic: (id) sender {
[audioPlayer stop];
// Load the Playlist direcly
MusicTableViewController *controller = [[MusicTableViewController alloc] initWithNibName: @"MusicTableView" bundle: nil];
controller.delegate = self;
controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController: controller animated: YES];
[controller release];
}
ご覧のとおり、プレイリストをロードすると、プレーヤーに再生を停止するように指示します
[audioPlayer stop];
しかし、何らかの理由で再生を停止できず、サウンドのオーバーラップが発生します。
これは私が理解しようとしている私の問題です。
ありがとうございました
そしてよろしく！