如何在 AVAudioPlayer 中循环播放多个音频文件？

Question

我想通过循环播放多个文件。
我在下面写了代码..
请帮帮我！！...

soundList = [[NSArray alloc] initWithObjects:@"mySong1.mp3",@"mySong2.mp3",@"mySong3.mp3",@"mySong4.mp3",@"mySong5.mp3",@"mySong6.mp3",@"mySong7.mp3",@"mySong8.mp3",@"mySong9.mp3", nil];
for (i=0; i<=([soundList count] - 1); ) {                
    while(i<[soundList count]){
        NSLog(@"File is : %@",[soundList objectAtIndex:i]);
        mediaPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:[soundList objectAtIndex:i] ofType:nil]] error:&error];
        [mediaPlayer setDelegate:self];
        self.lblCurrentSongName.text = [soundList objectAtIndex:i];
        [mediaPlayer prepareToPlay];
        i++;
    }
}

请给我建议.!!..

Answer 1

我会给你一个指导方针，但要注意它不是经过测试的代码。您提供的代码由于多种原因无法正常工作，1.您没有在 avaudioplayer 上调用 play 2.while 循环执行速度太快，歌曲将相互重叠，或者因为您没有存储对先前 avaudioplayer 的引用它可能会造成麻烦（不知道确切）

NSInteger currentSoundsIndex; //Don't forget to set this in viewDidLoad or elsewhere

//In viewDidLoad add this line
{
...
currentSoundsIndex = 0;
...
}

-(void) playCurrentSong
{
NSError *error;
mediaPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:[soundList objectAtIndex:currentSoundsIndex] ofType:nil]] error:&error];
if(error !=nil)
{
   NSLog(@"%@",error);
   //Also possibly increment sound index and move on to next song
}
else
{
self.lblCurrentSongName.text = [soundList objectAtIndex:currentSoundsIndex];
[mediaPlayer setDelegate:self];
[mediaPlayer prepareToPlay]; //This is not always needed, but good to include
[mediaPlayer play];
}

}

//This is the delegate method called after the sound finished playing, there are also other methods be sure to implement them for avoiding possible errors
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
//Increment index but don't go out of bounds
currentSoundsIndex = ++currentSoundsIndex % [soundList count];
[self playCurrentSong];
}

Answer 2

先声明

AVAudioPlayer *audioPlayer;

NSMutableArray *audioQueue;

然后使用下面的代码

-(void) addToPlayerQueue: (NSString *) file {

    if ( [audioQueue count] == 0 )
    {
        [audioQueue addObject:file];
        [self playSound: file];
    }
    else 
    {
        [audioQueue addObject:file];
    }
}


-(void) playSound : (NSString *) soundFile 
{
    NSURL *soundUrl = [NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource:soundFile ofType:@"caf"]];
    if ( soundUrl ) {
        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
        [audioPlayer setDelegate:self];
        [audioPlayer setVolume: playerVolume];
        [audioPlayer play];
    }
}



#pragma mark -
#pragma mark AVAudioPlayer Delegate Method

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    NSLog(@"Just got done playing %@", [audioQueue objectAtIndex:0]);
    [audioPlayer release];

    [audioQueue removeObjectAtIndex:0];

    if ( [audioQueue count] > 0 )
    {
        NSString *file = [audioQueue objectAtIndex:0];
        [self playSound:file];
    }
}

Answer 3

可能没有最优雅的解决方案，但您会在这里找到一个共同的想法。这是一个完全有效的代码，您可以将其复制/粘贴到您的项目中，它应该可以工作。当然，您必须更改文件名。如果您有任何问题，请告诉我。

#import "MainViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface MainViewController () <AVAudioPlayerDelegate>

@property (nonatomic, strong) AVAudioPlayer *audioPlayer;
@property (nonatomic, strong) NSMutableArray *soundsPathsList;
@property (nonatomic, assign) NSInteger curSoundIdx;

@end


@implementation MainViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        NSArray *soundList = [[NSArray alloc] initWithObjects:@"myAudioFile 1", @"myAudioFile 2", @"myAudioFile 3",
                              @"myAudioFile 4", @"myAudioFile 5", @"myAudioFile 6", @"myAudioFile 7",
                              @"myAudioFile 8", @"myAudioFile 9", @"myAudioFile 10", nil];

        self.soundsPathsList = [NSMutableArray new];
        for (NSString *fileName in soundList) {
            NSString *pathToFile = [[NSBundle mainBundle] pathForResource:fileName ofType:@"mp3"];
            NSURL *url = [NSURL fileURLWithPath:pathToFile];
            [self.soundsPathsList addObject:url];
        }

        [self playNext];
    }
    return self;
}

- (void) playNext {

    if (self.curSoundIdx >= [self.soundsPathsList count]) {
        self.curSoundIdx = 0;
    }

    // destroy player object
    [self.audioPlayer stop];
    self.audioPlayer = nil;

    // create new player object
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:
                        [self.soundsPathsList objectAtIndex:self.curSoundIdx] error:nil];
    self.audioPlayer.delegate = self;
    [self.audioPlayer play];

    self.curSoundIdx++;
}

#pragma mark - AVAudioPlayerDelegate

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    [self playNext];
}

@end

Answer 4

simply do it by using recursion ..

@property (nonatomic, strong) NSArray *arrTrackList;
@property (nonatomic, strong) NSMutableArray *arrAduioQueue;
@property (nonatomic, strong) AVAudioPlayer *audioPlayer;
@property (nonatomic) NSUInteger itemIndex;

@end

@implementation PLayMultipleTrackViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.arrTrackList = [NSArray arrayWithObjects:@"apple_ring",@"shukriya_pakistan",@"pakistan_anthem", nil];
    self.itemIndex = 0;
}

- (IBAction)TrackToPlay:(id)sender
{
    self.btnPlayAll.enabled = NO;
    NSString *trackFile = [self.arrTrackList objectAtIndex:self.itemIndex];
    [self AddToPlayList:trackFile];
}

-(void)AddToPlayList:(NSString *)file
{
        [self.arrAduioQueue addObject:file];
        [self playTrack:file];
}

-(void)playTrack:(NSString *)soundFile
{
    NSString *soundFilePath =[[NSBundle mainBundle] pathForResource: soundFile ofType: @"m4r"];
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
    self.audioPlayer =[[AVAudioPlayer alloc] initWithContentsOfURL: fileURL error: nil];
    [self.audioPlayer prepareToPlay];
    [self.audioPlayer setDelegate:self];
    self.audioPlayer.volume = 1.0;
    [self.audioPlayer play];
}

-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    [self.arrAduioQueue removeObjectAtIndex:0];
    self.itemIndex++;
    NSUInteger trackListIndex = [self.arrTrackList count];

    if (self.itemIndex < trackListIndex)
    {
        NSString *nextTrack = [self.arrTrackList objectAtIndex:self.itemIndex];
        [self AddToPlayList:nextTrack];
    }
    else
    {
        NSLog(@"PLaylist empty");
    }
}
@end