Question

我正在尝试在我的应用程序中实现一些简单的录音功能，我无法理解这样做。我被指向this example，但我不能让它在XCode中运行，它似乎是用C ++编写的。

我需要做的是将音频录制到文件中，然后能够在录制时获取录制的当前时间戳。我很感激任何帮助。谢谢！

Answer 1

您可以使用AVFoundation框架录制和播放音频。首先，您需要在.h文件中实现此功能，并在xcode项目设置中添加框架或库，如下所示：

Adding AVFoundation Framwork

添加到您的项目设置后，将AVFoundation导入.h文件中，如下所示：

#import <AVFoundation/AVFoundation.h>

现在在.h文件中实施您的代理：

@interface ViewController : UIViewController <AVAudioRecorderDelegate, AVAudioPlayerDelegate>

在此之后，在您的AVAudioRecorder文件中声明AVAudioPlayer和.h，如下所示：

@interface ViewController () {
     AVAudioRecorder *recorder;
     AVAudioPlayer *player;
IBOutlet UIButton *stopButton;
IBOutlet UIButton *playButton ;
}

- (IBAction)recordPauseTapped:(id)sender;
- (IBAction)stopTapped:(id)sender;
- (IBAction)playTapped:(id)sender;

现在在-(Void)ViewDidLoad{}：

中设置所有内容

- (void)viewDidLoad
{
     [super viewDidLoad];

     // Disable Stop/Play button when application launches
     [stopButton setEnabled:NO];
     [playButton setEnabled:NO];

     // Set the audio file
     NSArray *pathComponents = [NSArray arrayWithObjects:
                                [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                                @"MyAudioMemo.m4a",
                                nil];
     NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

     // Setup audio session
     AVAudioSession *session = [AVAudioSession sharedInstance];
     [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

     // Define the recorder setting
     NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

     [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
     [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
     [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

     // Initiate and prepare the recorder
     recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:NULL];
     recorder.delegate = self;
     recorder.meteringEnabled = YES;
     [recorder prepareToRecord];
}

现在实现录制按钮就像这样...

- (IBAction)recordPauseTapped:(id)sender {
     // Stop the audio player before recording
     if (player.playing) {
         [player stop];
     }

     if (!recorder.recording) {
         AVAudioSession *session = [AVAudioSession sharedInstance];
         [session setActive:YES error:nil];

         // Start recording
         [recorder record];
         [recordPauseButton setTitle:@"Pause" forState:UIControlStateNormal];

     } else {

         // Pause recording
         [recorder pause];
         [recordPauseButton setTitle:@"Record" forState:UIControlStateNormal];
     }

     [stopButton setEnabled:YES];
     [playButton setEnabled:NO];
}

现在实施StopButton IBAction：

- (IBAction)stopTapped:(id)sender {
     [recorder stop];

     AVAudioSession *audioSession = [AVAudioSession sharedInstance];
     [audioSession setActive:NO error:nil];
}

Next实现playTapped IBAction，如下所示：

- (IBAction)playTapped:(id)sender {
     if (!recorder.recording){
         player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:nil];
         [player setDelegate:self];
         [player play];
     }
}

最后通过执行以下操作来实施所需的AVPlayer Delegate：

- (IBAction)playTapped:(id)sender {
     if (!recorder.recording){
         player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:nil];
         [player setDelegate:self];
         [player play];
     }
}

就是这样！成品应该看起来像这样...... Example

有关详细信息，请查看以下链接：

文档链接：

希望这有助于。

Answer 2

上面提到的AVFoundation框架仅限iOS。在OS X上处理音频在开始时非常痛苦。 CoreAudio虽然是我工作过的最好的组件之一，但确实需要一些时间来学习和理解。您可能需要考虑使用https://github.com/syedhali/EZAudio来完成任务。

可可：简单的录音

2 个答案: