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我正在尝试在 iPhone4 上使用 AVQueuePlayer 播放 .m4a 声音文件，但没有声音。如果我尝试使用相同文件的 AudioServicesPlaySystemSound，一切正常。

这是代码。

(AVFoundation framework is installed.)

    #import <AVFoundation/AVFoundation.h> 

-(void) play_sound_file: (NSString *) sound_file_m4a
{
    printf("\n play_sound_file 1: '%s' ", [sound_file_m4a UTF8String] );


        AVPlayerItem *sound_file = [[AVPlayerItem alloc] initWithURL:[NSURL URLWithString:[[NSBundle mainBundle] pathForResource:sound_file_m4a ofType:@"m4a"]]]; 
        AVQueuePlayer *player = [AVQueuePlayer queuePlayerWithItems:[NSArray arrayWithObjects:sound_file, nil]];  

        [player play]; 

        return;
}

2012 年 8 月 28 日的最新代码...........（注意：两个声音文件都可以使用 AudioServicesPlaySystemSound）

AVPlayerItem *sound_file1 = [[AVPlayerItem alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[NSString alloc] initWithFormat:@"Hold still"] ofType:@"m4a"]]]; 

AVPlayerItem *sound_file2 = [[AVPlayerItem alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[NSString alloc] initWithFormat:@"Press go"] ofType:@"m4a"]]];     

AVQueuePlayer *player = [AVQueuePlayer queuePlayerWithItems: [NSArray arrayWithObjects:sound_file1, sound_file2,  nil]];  

[player play];
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1 回答 1

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我在您上一篇文章中对我的回答的评论中解释了如何解决这个问题。这可能不起作用的原因之一是因为您正在传递一个arrayWithObjects:需要多个项目的项目。另一个可能导致它不起作用的原因是，如果您尝试在模拟器中运行它，那么与模拟器之间存在已知的兼容性问题AVQueuePlayer。

还：

代替

AVPlayerItem *sound_file = [[AVPlayerItem alloc] initWithURL:[NSURL URLWithString:[[NSBundle mainBundle] pathForResource:sound_file_m4a ofType:@"m4a"]]];

和

AVPlayerItem *sound_file = [[AVPlayerItem alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[NSString alloc] initWithFormat:@"sound_file_m4a"] ofType:@"m4a"]]];

编辑：这是一个如何按顺序播放音频文件的示例。

在你的头文件中：

#import <AVFoundation/AVFoundation.h>

AVAudioPlayer *data;
NSArray *arrayOfTracks;
NSUInteger currentTrackNumber;

然后在你的实现文件中：

- (void)viewDidLoad
{
    [super viewDidLoad];
    arrayOfTracks = [[NSArray alloc] initWithObjects:@"1",@"2",@"3", nil];//Do NOT include file extension here
    currentTrackNumber = 0;
}
- (void)startPlaying
{
    if (data) {
        [data stop];
        //[data release]; if project isn't using Automatic Reference Counting
        data = nil;
    }
    data = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[NSString alloc] initWithString:[arrayOfTracks objectAtIndex:currentTrackNumber]] ofType:@"m4a"]] error:NULL];
    data.delegate = self;
    [data play];
}

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    if (flag) {
        if (currentTrackNumber < [arrayOfTracks count] - 1) {
            currentTrackNumber ++;
            if (data) {
                [data stop];
                //[data release]; if project isn't using Automatic Reference Counting
                data = nil;
            }
            data = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[NSString alloc] initWithString:[arrayOfTracks objectAtIndex:currentTrackNumber]] ofType:@"m4a"]] error:NULL];
            data.delegate = self;
            [data play];
        }
    }
}
于 2012-08-28T13:55:16.997 回答