AVAudioPlayer不播放AMR文件 [英] AVAudioPlayer do not play AMR files

问题描述

我使用以下代码从网上下载AMR文件并通过AVAudioPlayer播放，但我一直都出现unrecongnize selector sent to instance错误.

I ad using below code to download an AMR file from web and playing by AVAudioPlayer but all times I get the unrecongnize selector sent to instance error.

这是开始下载并播放的方法:

This is the method that start download and play:

- (IBAction)DisplayAudioPlayView:(id)sender 
{    
    [self InitializePlayer];   
}

-(void) InitializePlayer
{
    // Get the file path to the doa audio to play.
    NSString *filePath = [[ServerInteraction instance] getAudio:audioData.ID];

    // Convert the file path to a URL.
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: filePath];

    //Initialize the AVAudioPlayer.
    audioPlayer=  [AVPlayer playerWithURL:fileURL] ;
    audioPlayer.delegate= self; //THIS LINE CAUSE ERROR//

    // Preloads the buffer and prepares the audio for playing.
    [audioPlayer prepareToPlay];
    audioPlayer.currentTime = 0;

    [audioPlayer play]
}

修改

根据@Michael的建议，我更改了代码，并且此帖子我将代码更改为:

Based on @Michael advise I change my code and this post I changed my code to this:

NSURL *fileURL = [[NSURL alloc] initWithString: @"http://www.domain1.com/mysound.mp3"];

//Initialize the AVAudioPlayer.
audioPlayer=  [AVPlayer playerWithURL:fileURL];
[audioPlayer play];

现在它播放声音了，但是当我使用http://maindomain.com/mysound.amr时它没有播放声音.

Now it played the sound but when I use http://maindomain.com/mysound.amr it is not playing the sound.

推荐答案

检查以下几点:

• 不再支持AMR(对于iOS 4.3或更高版本，请参见 AVAudioPlayerDelegate协议?

• 您是否已添加并正确链接了AVAudioFoundation框架(#import <AVFoundation/AVFoundation.h>)?

• AMR is no longer supported (for ≥ iOS 4.3, see supported audio formats in the Apple iOS SDK Documentation).
• Do you want to use the AVPlayer (audio and video) or do you want audio only? Use for Audio only the AVAudioPlayer. The following code snippet shows how to handle it.
• If you want to use AVAudioPlayer, does your self instance implement the AVAudioPlayerDelegate Protocol?
• Does your self instance implement the AVAudioPlayerDelegate Protocol?

• Have you added and linked correctly the AVAudioFoundation framework (#import <AVFoundation/AVFoundation.h>)?

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"m4a"]];

    NSError *error = noErr;
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    if (error)
    {
        NSLog(@"Error in audioPlayer: %@", [error localizedDescription]);
    }
    else 
    {
        self.audioPlayer.delegate = self;
        [self.audioPlayer prepareToPlay];
    }
}

- (void)playAudio
{
    [self.audioPlayer play];
}

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