关于使用 AVAudioPlayer 自动录制和自动播放 AVAudioRecorder

Posted 2023-02-25

【中文标题】关于使用 AVAudioPlayer 自动录制和自动播放 AVAudioRecorder

【英文标题】：About auto record and auto play with AVAudioPlayer&AVAudioRecorder

【发布时间】：2012-06-16 02:10:03

【问题描述】：

在 .h 文件中我这样写：

#import <UIKit/UIKit.h>
#import "SCListener.h"
#import <AVFoundation/AVFoundation.h>

@interface TalkingAndSayingViewController : UIViewController<AVAudioPlayerDelegate>


IBOutlet UIImageView *bkg;
IBOutlet UILabel *showVoulme;

SCListener *listener;

NSTimer *time;

BOOL listen;
NSString *audioPath;
AVAudioRecorder *recoder;
AVAudioPlayer *player;

int breakCount;

BOOL timeActive;


@property(nonatomic,assign)int roleIndex;
@end

在 .m 文件中我写了这个：

- (void)viewDidLoad


[super viewDidLoad];

NSArray *searchPaths =  NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
audioPath = [[searchPaths objectAtIndex:0] stringByAppendingPathComponent:@"audio.wav"];
[audioPath retain];

listen = YES;

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

NSString *imgName = [NSString stringWithFormat:@"role%d.png",self.roleIndex];
[bkg setImage:[UIImage imageNamed:imgName]];

recoder = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath:audioPath] settings:recordSettings error:nil];
[recoder setMeteringEnabled:YES];

player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:audioPath] error:nil];
[player setNumberOfLoops:0];

AVAudiosession *audioSession = [[AVAudioSession sharedInstance] retain];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive:YES error: nil];

time = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(CheckVolume) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:time forMode:NSDefaultRunLoopMode];



-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag

     timeActive = YES;
        listen = YES;
        NSLog(@"fihish playing, start listen");


-(void)CheckVolume

        
        Float32 peak = [[SCListener sharedListener] peakPower];
        if(timeActive)
        
            if(listen)
            
                [showVoulme setText:[NSString stringWithFormat:@"%f",peak]];
                if(peak>0.3)
                
                    listen = NO;
                    [recoder prepareToRecord];
                    [recoder record];
                    NSLog(@"start recording");
                
            

            else
            
                if(peak<0.1)
                
                    if(breakCount >= 5)
                    
                        NSLog(@"start play");

                        [recoder stop];

                        player.delegate = self;
                        [player prepareToPlay];
                        [player play];
                        timeActive = NO;
                        breakCount = 0;
                    
                    else 
                        breakCount++;
                
                else
                    breakCount = 0;
            
        
    

-(void)viewWillDisappear:(BOOL)animated

    [recoder stop];
    [[SCListener sharedListener] stop];

    timeActive = NO;


-(void)viewDidAppear:(BOOL)animated

    timeActive = YES;

    [[SCListener sharedListener] listen];

    breakCount = 0;

这里有一些问题， first:audioPlayerDidFinishPlaying这个函数根本没有做，这段代码只能运行“开始播放”，但实际上声音并没有播放，我以前用录音机在录音状态下检查音量，但是 peakPowerForChannel:0 只返回一个静态值 0.00001，我不知道如何解决这个问题，任何人都可以帮助我或给我发送自动录制和自动播放的示例代码？对此，我真的非常感激。谢谢

【问题讨论】：

我认为没有调用 audioPlayerDidFinishPlaying 方法，因为您将 player.delegate = self; 设置在非常奇怪的地方。最好在播放器初始化后立即设置委托。

【参考方案1】：

是的，已经 5 年过去了，我仍然与 iOS 开发人员合作，这个问题在提出这个问题后大约一个月内得到解决，我不记得看到这个答案。我当时做了一个像会说话的应用程序。而且已经完成了，但是对我来说没用。