2

我有一个按钮，用户点击开始录制并再次点击停止。当它停止时，我希望录制的语音“回声”，以便用户可以听到录制的内容。这第一次工作正常。如果我第三次点击按钮，它会开始新的录制，当我点击停止时，它会因 EXC_BAD_ACCESS 而崩溃。

- (IBAction) readToMeTapped {

        if(recording)

        {
        recording = NO;
        [readToMeButton setTitle:@"Stop Recording" forState: UIControlStateNormal ];    

        NSMutableDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
         [NSNumber numberWithFloat: 44100.0],                 AVSampleRateKey,
         [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
         [NSNumber numberWithInt: 1],                         AVNumberOfChannelsKey,
         [NSNumber numberWithInt: AVAudioQualityMax],         AVEncoderAudioQualityKey,
         nil];

        // Create a new dated file
        NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];
        NSString *caldate = [now description];          
        recordedTmpFile = [NSURL fileURLWithPath:[[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain]];
        error = nil;
        recorder = [[ AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSetting error:&error];
        [recordSetting release];
        if(!recorder){
            NSLog(@"recorder: %@ %d %@", [error domain], [error code], [[error userInfo] description]);
            UIAlertView *alert =
            [[UIAlertView alloc] initWithTitle: @"Warning"
                                       message: [error localizedDescription]
                                      delegate: nil
                             cancelButtonTitle:@"OK"
                             otherButtonTitles:nil];
            [alert show];
            [alert release];
            return;
        }


        NSLog(@"Using File called: %@",recordedTmpFile);
        //Setup the recorder to use this file and record to it.

        [recorder setDelegate:self];
        [recorder prepareToRecord];

        [recorder recordForDuration:(NSTimeInterval) 5]; //recording for a limited time

    }
    else
    { // it crashes the second time it gets here!
        recording = YES;            
        NSLog(@"Recording YES Using File called: %@",recordedTmpFile);
        [readToMeButton setTitle:@"Start Recording" forState:UIControlStateNormal ];

        [recorder stop]; //Stop the recorder.

        //playback recording
        AVAudioPlayer * newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error];
        [recordedTmpFile release];

        self.aPlayer = newPlayer;
        [newPlayer release];

        [aPlayer setDelegate:self];
        [aPlayer prepareToPlay];
        [aPlayer play];
        }   
}

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)sender successfully:(BOOL)flag {

        NSLog (@"audioRecorderDidFinishRecording:successfully:");

        [recorder release];
        recorder = nil;
}

检查调试器，它在此处标记错误

@synthesize aPlayer, recorder;

这是我不明白的部分。我认为这可能与释放内存有关，但我一直很小心。我错过了什么吗？

4

2 回答 2

1

在研究了一段时间后，我偶然发现了这个调试技巧。它告诉我 AVAudioPlayer 第二次被释放，导致崩溃。所以代表一定已经完成了清理工作？我检查了这个SO线程，建议不要解除分配。但是，如果我删除该行

   [newPlayer release];

我的程序有效！在阅读了这个SO线程之后，我相信我的问题是我应该AVAudioPlayerDelegate's - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag在播放完声音后实现方法并在那里释放音频播放器。我已经为 AVAudioRecorder 完成了它。

于 2010-04-30T21:24:27.247 回答
0

你确定@property (retain)不包括非原子的吗？我在想一些访问这些属性的代码可能是从另一个线程这样做的。此外，您应该始终使用 self.recorder 和 self.player 通过它们的 getter 访问这些属性，以确保它们在各自的锁中被访问。

于 2010-04-30T07:23:04.863 回答