ios/Timi/Class/Base/Utils/AudioRecorder/AudioRecorder.m

//
//  AudioRecorder.m
//  mask
//
//  Created by 翟玉磊 on 2019/1/3.
//  Copyright © 2019 翟玉磊. All rights reserved.
//

#import "AudioRecorder.h"

// 导入录音头文件（注意添加framework：AVFoundation.framework、AudioToolbox.framework）
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
#import "NSTimer+Weak.h"

@interface AudioRecorder () <AVAudioRecorderDelegate, AVAudioPlayerDelegate>

@property (nonatomic, strong) NSTimer *audioRecorderTimer;               // 录音音量计时器
@property (nonatomic, strong) NSMutableDictionary *audioRecorderSetting; // 录音设置
@property (nonatomic, strong) AVAudioRecorder *audioRecorder;            // 录音
@property (nonatomic, strong) AVAudioPlayer *audioPlayer;                // 播放
@property (nonatomic, assign) double audioRecorderTime;                  // 录音时长

@end


@implementation AudioRecorder


/// 录音文件保存路径
NSString *GetFilePathWithDate()
{
    NSDate *currentDate = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"YYYYMMddHHmmss"];
    NSString *filePath = [dateFormatter stringFromDate:currentDate];
    filePath = [NSString stringWithFormat:@"%@.aac", filePath];
    
    NSString *tmpPath = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];
    
    filePath = [tmpPath stringByAppendingFormat:@"/%@",filePath];
    
    return filePath;
}

/// 获取文件名（包含后缀，如：xxx.acc；不包含文件类型，如xxx）
NSString *GetFileNameWithFilePath(NSString *filePath, BOOL hasFileType)
{
    NSString *fileName = [filePath stringByDeletingLastPathComponent];
    if (hasFileType)
    {
        fileName = [filePath lastPathComponent];
    }
    return fileName;
}

/// 获取文件大小
long long GetFileSizeWithFilePath(NSString *filePath)
{
    BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath];
    if (isExist)
    {
        NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];
        long long fileSize = fileDict.fileSize;
        return fileSize;
    }
    
    return 0.0;
}

/// 删除文件
void DeleteFileWithFilePath(NSString *filePath)
{
    BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath];
    if (isExist)
    {
        [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
    }
}

#pragma mark - 实例化

- (instancetype)init
{
    self = [super init];
    
    if (self)
    {
        // 参数设置 格式、采样率、录音通道、线性采样位数、录音质量
        self.audioRecorderSetting = [NSMutableDictionary dictionary];
        [self.audioRecorderSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
        [self.audioRecorderSetting setValue:[NSNumber numberWithInt:11025] forKey:AVSampleRateKey];
        [self.audioRecorderSetting setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
        [self.audioRecorderSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
        [self.audioRecorderSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];
    }
    
    return self;
}

/// 录音单例
+ (AudioRecorder *)shareManager
{
    static AudioRecorder *staticAudioRecorde;
    static dispatch_once_t once;
    dispatch_once(&once, ^{
        staticAudioRecorde = [[self alloc] init];
    });
    
    return staticAudioRecorde;
}

// 内存释放
- (void)dealloc
{
    // 内存释放前先停止录音，或音频播放
    [self audioStop];
    [self audioRecorderStop];
    
    // 内存释放
    if (self.audioRecorderTime)
    {
        [self.audioRecorderTimer invalidate];
        self.audioRecorderTimer = nil;
    }
    
    if (self.audioRecorderSetting)
    {
        self.audioRecorderSetting = nil;
    }
    
    if (self.audioRecorder)
    {
        self.audioRecorder = nil;
    }
    
    if (self.audioPlayer)
    {
        self.audioPlayer = nil;
    }
}

#pragma mark - 音频处理-录音

/// 开始录音
- (void)audioRecorderStartWithFilePath:(NSString *)filePath
{
    // 生成录音文件
    NSURL *urlAudioRecorder = [NSURL fileURLWithPath:filePath];
    self.audioRecorder = [[AVAudioRecorder alloc] initWithURL:urlAudioRecorder settings:self.audioRecorderSetting error:nil];
    
    // 开启音量检测
    [self.audioRecorder setMeteringEnabled:YES];
    [self.audioRecorder setDelegate:self];
    
    if (self.audioRecorder)
    {
        // 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.audioRecorder prepareToRecord])
        {
            [self.audioRecorder record];
            
            // 设置定时检测
            WeakSelf
            self.audioRecorderTimer = [NSTimer scheduledTimerWithTimeInterval:0 event:^(NSTimer * _Nonnull timer) {
                [weakSelf detectionVoice];
            }];
        }
    }
}

/// 录音音量显示
- (void)detectionVoice
{
    // 刷新音量数据
    [self.audioRecorder updateMeters];
    
    //    // 获取音量的平均值
    //    [self.audioRecorder averagePowerForChannel:0];
    //    // 音量的最大值
    //    [self.audioRecorder peakPowerForChannel:0];
    
    double lowPassResults = pow(10, (0.05 * [self.audioRecorder peakPowerForChannel:0]));
    double currentTime = self.audioRecorder.currentTime;
//    NSLog(@"lowPassResults:%.2f", lowPassResults);
    
    if (self.detectionVoiceBlock) {
        self.detectionVoiceBlock(lowPassResults, currentTime);
    }
}

/// 停止录音
- (void)audioRecorderStop
{
    if (self.audioRecorder)
    {
        if ([self.audioRecorder isRecording])
        {
            // 获取录音时长
            self.audioRecorderTime = [self.audioRecorder currentTime];
            [self.audioRecorder stop];
            
            // 停止录音后释放掉
            self.audioRecorder = nil;
        }
    }
    
    // 释放计时器
    [self.audioRecorderTimer invalidate];
    self.audioRecorderTimer = nil;
}

/// 根据录音文件获取录音时长
- (NSTimeInterval)durationAudioRecorderWithFilePath:(NSString *)filePath
{
    NSURL *urlFile = [NSURL fileURLWithPath:filePath];
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlFile error:nil];
    NSTimeInterval time = self.audioPlayer.duration;
    self.audioPlayer = nil;
    return time;
}

#pragma mark - 音频处理-播放/停止

/// 音频开始播放或停止
- (void)audioPlayWithFilePath:(NSString *)filePath
{
    if (self.audioPlayer)
    {
        // 判断当前与下一个是否相同
        // 相同时，点击时要么播放，要么停止
        // 不相同时，点击时停止播放当前的，开始播放下一个
        NSString *currentStr = [self.audioPlayer.url relativeString];
        
        // currentStr包含字符"file://location/"，通过判断filePath是否为currentPath的子串，是则相同，否则不同
        NSRange range = [currentStr rangeOfString:filePath];
        if (range.location != NSNotFound)
        {
            if ([self.audioPlayer isPlaying])
            {
                [self.audioPlayer stop];
                self.audioPlayer = nil;
            }
            else
            {
                self.audioPlayer = nil;
                [self audioPlayerPlay:filePath];
            }
        }
        else
        {
            [self audioPlayerStop];
            [self audioPlayerPlay:filePath];
        }
    }
    else
    {
        [self audioPlayerPlay:filePath];
    }
    
}

/// 音频播放停止
- (void)audioStop
{
    [self audioPlayerStop];
}

- (BOOL)playing {
    return self.audioPlayer.playing;
}

/// 音频播放器开始播放
- (void)audioPlayerPlay:(NSString *)filePath
{
    // 判断将要播放文件是否存在
    BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath];
    if (!isExist)
    {
        return;
    }
    
    NSURL *urlFile = [NSURL fileURLWithPath:filePath];
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlFile error:nil];
    self.audioPlayer.delegate = self;
    if (self.audioPlayer)
    {
        if ([self.audioPlayer prepareToPlay])
        {
            // 播放时，设置喇叭播放否则音量很小
            AVAudioSession *playSession = [AVAudioSession sharedInstance];
            [playSession setCategory:AVAudioSessionCategoryPlayback error:nil];
            [playSession setActive:YES error:nil];
            
            [self.audioPlayer play];
        }
    }
}

/// 音频播放器停止播放
- (void)audioPlayerStop
{
    if (self.audioPlayer)
    {
        if ([self.audioPlayer isPlaying])
        {
            [self.audioPlayer stop];
        }
        
        self.audioPlayer = nil;
    }
    
    if (self.playerFinished) {
        self.playerFinished();
    }
}

- (void)clear {
    if (_audioRecorderTimer) {
        [_audioRecorderTimer invalidate];
        _audioRecorderTimer = nil;
    }
    if (_audioRecorder) {
        [_audioRecorder stop];
        _audioRecorder = nil;
    }
    if (_audioPlayer) {
        [_audioPlayer stop];
        _audioPlayer = nil;
    }
}

#pragma mark - AVAudioPlayerDelegate
/// 播放完成时调用的方法  (代理里的方法),需要设置代理才可以调用
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    
    [self audioPlayerStop];
}

@end