使用AVAudioRecorder录制音频

待我称王封你为后i 2022-05-17 04:58 280阅读 0赞

[SYAudio][]

导入录音头文件（注意添加framework：`AVFoundation.framework`、`AudioToolbox.framework`）

#import <AVFoundation/AVFoundation.h>
    #import <AudioToolbox/AudioToolbox.h>

@property (nonatomic, strong) AVAudioRecorder *recorder; // 录音
    
    @property (nonatomic, strong) NSTimer *voiceTimer; // 录音音量计时器

开始录音

- (void)recorderStart:(NSString *)filePath
    {
        if (!filePath || filePath.length <= 0) {
            NSLog(@"文件路径无效");
            return;
        }
    
        // 强转音频格式为xx.caf
        BOOL isCaf = [filePath hasSuffix:@".caf"];
        if (isCaf) {
            self.recorderFilePath = filePath;
        } else {
            NSRange range = [filePath rangeOfString:@"." options:NSBackwardsSearch];
            NSString *filePathTmp = [filePath substringToIndex:(range.location + range.length)];
            self.recorderFilePath = [NSString stringWithFormat:@"%@caf", filePathTmp];
        }
    
           // 参数设置 格式、采样率、录音通道、线性采样位数、录音质量
           NSMutableDict  *recorderDict = [NSMutableDictionary dictionary];
            // kAudioFormatMPEG4AAC ：xxx.acc；kAudioFormatLinearPCM ：xxx.caf
            [_recorderDict setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
            [_recorderDict setValue:[NSNumber numberWithInt:16000] forKey:AVSampleRateKey];
            [_recorderDict setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
            [_recorderDict setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
            [_recorderDict setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];
        // 生成录音文件
        NSURL *urlAudioRecorder = [NSURL fileURLWithPath:filePath];
        self.recorder = [[AVAudioRecorder alloc] initWithURL:urlAudioRecorder settings:recorderDict error:nil];
    
        // 开启音量检测
        self.recorder.meteringEnabled = YES;
        self.recorder.delegate = self;
    
        if (self.recorder)
        {
            // 录音时设置audioSession属性，否则不兼容Ios7
            AVAudioSession *recordSession = [AVAudioSession sharedInstance];
            [recordSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
            [recordSession setActive:YES error:nil];
    
            if ([self.recorder prepareToRecord])
            {
                [self.recorder record];            
                [self startVoiceTimer];
            }
        }
    }

停止录音

- (void)recorderStop
    {
        if (self.recorder)
        {
            if ([self.recorder isRecording])
            {
                [self.recorder stop];
    
                // 停止录音后释放掉
                self.recorder.delegate = nil;
                self.recorder = nil;
            }
        }
    
        [self stopVoiceTimer];
    }

录音音量开启监测

- (void)startVoiceTimer
    {
        if (self.monitorVoice) {
            self.voiceTimer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(detectionVoice) userInfo:nil repeats: YES];
            [[NSRunLoop currentRunLoop] addTimer:self.voiceTimer forMode:NSRunLoopCommonModes]; [self.voiceTimer setFireDate:[NSDate distantPast]];
            NSLog(@"开始检测音量");
        }
    }

录音音量停止监测

- (void)stopVoiceTimer
    {
        if (self.voiceTimer)
        {
            [self.voiceTimer setFireDate:[NSDate distantFuture]];
            if ([self.voiceTimer isValid])
           {
               [self.voiceTimer invalidate];
           }
           self.voiceTimer = nil;
            NSLog(@"停止检测音量");
        }
    }

录音音量显示

- (void)detectionVoice
    {
        // 刷新音量数据
        [self.recorder updateMeters];
    
    // // 获取音量的平均值
    // [self.audioRecorder averagePowerForChannel:0];
    // // 音量的最大值
    // [self.audioRecorder peakPowerForChannel:0];
    
        double voice = pow(10, (0.05 * [self.recorder peakPowerForChannel:0]));    
        NSLog(@"voice: %f", voice);
    }

[SYAudio]: https://github.com/potato512/SYAudio