Question

我有一些适用于iOS 4.3的代码。我在互联网上看了一眼，我发现其他人遇到了同样的问题但没有回答对我有用。我想我可以录制一些但我无法播放它。这是我的代码：

DetailViewController.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>
#import <AudioToolbox/AudioServices.h>

@interface DetailViewController : UIViewController <UISplitViewControllerDelegate, AVAudioRecorderDelegate> {

id detailItem;
UILabel *detailDescriptionLabel;

IBOutlet UIButton *btnStart;
IBOutlet UIButton *btnPlay;

//Variables setup for access in the class:
NSURL * recordedTmpFile;
AVAudioRecorder * recorder;
BOOL toggle;
}

// Needed properties
@property (nonatomic, retain) IBOutlet UIButton *btnStart;
@property (nonatomic, retain) IBOutlet UIButton *btnPlay;
@property (strong, nonatomic) id detailItem;
@property (strong, nonatomic) IBOutlet UILabel *detailDescriptionLabel;

-(IBAction) start_button_pressed;
-(IBAction) play_button_pressed;
@end

DetailViewController.m

- (void)viewDidLoad {
[super viewDidLoad];
toggle = YES;
btnPlay.hidden = YES;
NSError *error;

// Create the Audio Session
AVAudioSession *audioSession = [AVAudioSession sharedInstance];

// Set up the type of session
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];

// Activate the session.
[audioSession setActive:YES error:&error];

[self configureView];    
}

-(IBAction) start_button_pressed{
if (toggle) {
    toggle = NO;
    [btnStart setTitle:@"Press to stop recording" forState:UIControlStateNormal];
    btnPlay.enabled = toggle;
    btnPlay.hidden = !toggle;
            NSError *error;

    NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] init];

    [recordSettings setValue:[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];

    [recordSettings setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];

    [recordSettings setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];

    // Create a temporary files to save the recording. 
    recordedTmpFile = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat: @"%.0f.%@", [NSDate timeIntervalSinceReferenceDate] * 1000.0, @"caf"]]];

    NSLog(@"The temporary file used is: %@", recordedTmpFile);

    recorder = [[AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSettings error:&error];

    [recorder setDelegate:self];

    [recorder prepareToRecord];
    [recorder record];
}
else {
    toggle = YES;
    [btnStart setTitle:@"Start recording" forState:UIControlStateNormal];
    btnPlay.hidden = !toggle;
    btnPlay.enabled = toggle;

    NSLog(@"Recording stopped and saved in file: %@", recordedTmpFile);
    [recorder stop];
}
}

-(IBAction) play_button_pressed{

NSError *error;
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error];

   if (!error)
   {
       [avPlayer prepareToPlay];
       [avPlayer play];

       NSLog(@"File is playing");
   }

}

- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player
                    successfully: (BOOL) flag {
     NSLog (@"audioPlayerDidFinishPlaying:successfully:");
}

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully: (BOOL)flag
{
    NSLog (@"audioRecorderDidFinishRecording:successfully:");
}

以下是我的程序运行：

2011-11-25 11：58：02.005 Bluetooth1 [897：707]使用的临时文件是：file：// localhost / private / var / mobile / Applications / D81023F8-C53D-4AC4-B1F7-14D66EB4844A / tmp /343915082005.caf 2011-11-25 11：58：05.956 Bluetooth1 [897：707]录制停止并保存在文件中：file：// localhost / private / var / mobile / Applications / D81023F8-C53D-4AC4-B1F7-14D66EB4844A / tmp / 343915082005的.caf 2011-11-25 11：58：05.998 Bluetooth1 [897：707] audioRecorderDidFinishRecording：成功： 2011-11-25 11：58：11.785 Bluetooth1 [897：707]正在播放文件

由于某种原因，从不调用函数audioPlayerDidFinishPlaying。然而，似乎记录了一些东西。现在我不知道哪个部分不起作用，但我想这与AVAudioPlayer有关。

[编辑]它变得越来越怪异。我想确保记录的内容，所以我希望记录记录的持续时间。这是新的播放功能：

-(IBAction) play_button_pressed{

    NSError *error;
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: recordedTmpFile error:&error];

    if (!error)
    {
        AVURLAsset* audioAsset = [AVURLAsset URLAssetWithURL:recordedTmpFile options:nil];
        CMTime audioDuration = audioAsset.duration;
        float audioDurationSeconds = CMTimeGetSeconds(audioDuration);

        [avPlayer prepareToPlay];
        [avPlayer play];

        NSString *something = [NSString stringWithFormat:@"%f",audioDurationSeconds]; 
        NSLog(@"File is playing: %@", something);
    }
    else
    {
         NSLog(@"Error playing.");
    }   
}

现在，记录的长度是有意义的（如果我记录10秒，它显示大约10秒左右）。但是，当我第一次放入这些代码行时，我忘了将转换浮动到NSString。所以它崩溃了...应用程序播放声音...经过不同的测试后，我可以得出结论，我的应用程序可以录制和播放声音，但是会崩溃播放录制的声音。我不知道会出现什么问题。我发现AVPlayer是异步的，它们与它有关吗？我完全迷失了......

Answer 1

使用以下代码替换urlpath：

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(
         NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filepath = [documentsDirectory stringByAppendingPathComponent:@"urfile.xxx"];

NSURL *url = [NSURL fileURLWithPath:filepath];

Answer 2

在此尝试解决方案：

Recording and playback

Answer 3

好的，回答你自己的问题并不是很酷。此外，当答案不干净但它正在工作时......为了播放我录制的内容，我使用了以下代码块：

    AVURLAsset* audioAsset = [AVURLAsset URLAssetWithURL:recordedTmpFile options:nil];
    CMTime audioDuration = audioAsset.duration;
    float audioDurationSeconds = CMTimeGetSeconds(audioDuration);

    [avPlayer prepareToPlay];
    [avPlayer play];

    // Block for audioDurationSeconds seconds
    [NSThread sleepForTimeInterval:audioDurationSeconds];

我正在计算录制文件的长度，我正在等待这段时间......它很脏，但它正在做这个伎俩。另外，如果它在另一个线程中启动，它将不会阻止该应用程序。

我有人愿意接受它！

iOS 5 - AVAPlayer不再工作了

3 个答案: