iOS 音频录制、播放，使用音频处理框架The Amazing Audio Engine实现音频录制播放 —— HERO博客

iOS 第三方音频框架The Amazing Audio Engine使用，实现音频录制、播放，可设置配乐。

首先看一下效果图：

下面贴上核心控制器代码：

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "HWProgressHUD.h"
#import "UIImage+HW.h"
#import "AERecorder.h"
#import "HWRecordingDrawView.h"

#define KMainW [UIScreen mainScreen].bounds.size.width
#define KMainH [UIScreen mainScreen].bounds.size.height

@interface ViewController ()

@property (nonatomic, strong) AERecorder *recorder;
@property (nonatomic, strong) AEAudioController *audioController;
@property (nonatomic, strong) AEAudioFilePlayer *player;
@property (nonatomic, strong) AEAudioFilePlayer *backgroundPlayer;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, strong) NSMutableArray *soundSource;
@property (nonatomic, weak) HWRecordingDrawView *recordingDrawView;
@property (nonatomic, weak) UILabel *recLabel;
@property (nonatomic, weak) UILabel *recordTimeLabel;
@property (nonatomic, weak) UILabel *playTimeLabel;
@property (nonatomic, weak) UIButton *auditionBtn;
@property (nonatomic, weak) UIButton *recordBtn;
@property (nonatomic, weak) UISlider *slider;
@property (nonatomic, copy) NSString *path;

@end

@implementation ViewController

- (AEAudioController *)audioController
{
    if (!_audioController) {
        _audioController = [[AEAudioController alloc] initWithAudioDescription:[AEAudioController nonInterleavedFloatStereoAudioDescription] inputEnabled:YES];
        _audioController.preferredBufferDuration = 0.005;
        _audioController.useMeasurementMode = YES;
    }

    return _audioController;
}

- (NSMutableArray *)soundSource
{
    if (!_soundSource) {
        _soundSource = [NSMutableArray array];
    }

    return _soundSource;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    [self creatControl];
}

- (void)creatControl
{
    CGFloat marginX = 30.0f;

    //音频视图
    HWRecordingDrawView *recordingDrawView = [[HWRecordingDrawView alloc] initWithFrame:CGRectMake(marginX, 80, KMainW - marginX * 2, 100)];
    [self.view addSubview:recordingDrawView];
    _recordingDrawView = recordingDrawView;

    //REC
    UILabel *recLabel = [[UILabel alloc] initWithFrame:CGRectMake(marginX, CGRectGetMaxY(recordingDrawView.frame) + 20, 80, 40)];
    recLabel.text = @"REC";
    recLabel.textColor = [UIColor redColor];
    [self.view addSubview:recLabel];
    _recLabel = recLabel;

    //录制时间
    UILabel *recordTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(recLabel.frame) + 20, CGRectGetMinY(recLabel.frame), 150, 40)];
    recordTimeLabel.text = @"录制时长：00:00";
    [self.view addSubview:recordTimeLabel];
    _recordTimeLabel = recordTimeLabel;

    //播放时间
    UILabel *playTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMinX(recordTimeLabel.frame), CGRectGetMaxY(recordTimeLabel.frame), 150, 40)];
    playTimeLabel.text = @"播放时长：00:00";
    playTimeLabel.hidden = YES;
    [self.view addSubview:playTimeLabel];
    _playTimeLabel = playTimeLabel;

    //配乐按钮
    NSArray *titleArray = @[@"无配乐", @"夏天", @"阳光海湾"];
    CGFloat btnW = 80.0f;
    CGFloat padding = (KMainW - marginX * 2 - btnW * titleArray.count) / (titleArray.count - 1);
    for (int i = 0; i < titleArray.count; i++) {
        CGFloat btnX = marginX + (btnW + padding) * i;
        UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(btnX, CGRectGetMaxY(playTimeLabel.frame) + 20, btnW, btnW)];
        [btn setTitle:titleArray[i] forState:UIControlStateNormal];
        btn.layer.cornerRadius = btnW * 0.5;
        btn.layer.masksToBounds = YES;
        [btn setBackgroundImage:[UIImage imageWithColor:[UIColor grayColor]] forState:UIControlStateNormal];
        [btn setBackgroundImage:[UIImage imageWithColor:[UIColor orangeColor]] forState:UIControlStateSelected];
        if (i == 0) btn.selected = YES;
        btn.tag = 100 + i;
        [btn addTarget:self action:@selector(changeBackgroundMusic:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
    }

    //配乐音量
    UILabel *backgroundLabel = [[UILabel alloc] initWithFrame:CGRectMake(marginX + 10, CGRectGetMaxY(playTimeLabel.frame) + 120, 80, 40)];
    backgroundLabel.text = @"配乐音量";
    [self.view addSubview:backgroundLabel];

    //配乐音量
    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(CGRectGetMaxX(backgroundLabel.frame) + 10, CGRectGetMinY(backgroundLabel.frame), 210, 40)];
    slider.value = 0.4f;
    [slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:slider];
    _slider = slider;

    //试听按钮
    UIButton *auditionBtn = [[UIButton alloc] initWithFrame:CGRectMake(marginX, KMainH - 150, 120, 80)];
    auditionBtn.hidden = YES;
    auditionBtn.backgroundColor = [UIColor blackColor];
    [auditionBtn setTitle:@"试听" forState:UIControlStateNormal];
    [auditionBtn setTitle:@"停止" forState:UIControlStateSelected];
    [auditionBtn addTarget:self action:@selector(auditionBtnOnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:auditionBtn];
    _auditionBtn = auditionBtn;

    //录音按钮
    UIButton *recordBtn = [[UIButton alloc] initWithFrame:CGRectMake(KMainW - marginX - 120, KMainH - 150, 120, 80)];
    recordBtn.backgroundColor = [UIColor blackColor];
    [recordBtn setTitle:@"开始" forState:UIControlStateNormal];
    [recordBtn setTitle:@"暂停" forState:UIControlStateSelected];
    [recordBtn addTarget:self action:@selector(recordBtnOnClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:recordBtn];
    _recordBtn = recordBtn;
}

//配乐按钮点击事件
- (void)changeBackgroundMusic:(UIButton *)btn
{
    //更新选中状态
    for (int i = 0; i < 3; i++) {
        UIButton *button = (UIButton *)[self.view viewWithTag:100 + i];
        button.selected = NO;
    }
    btn.selected = YES;

    //移除之前配乐
    if (_backgroundPlayer) {
        [_audioController removeChannels:@[_backgroundPlayer]];
        _backgroundPlayer = nil;
    }

    NSURL *url;
    if (btn.tag == 100) {
        return;
    }else if (btn.tag == 101) {
        url = [[NSBundle mainBundle]URLForResource:@"夏天.mp3" withExtension:nil];
    }else if (btn.tag == 102) {
        url = [[NSBundle mainBundle]URLForResource:@"阳光海湾.mp3" withExtension:nil];
    }
    [self.audioController start:NULL];

    NSError *AVerror = NULL;
    _backgroundPlayer = [AEAudioFilePlayer audioFilePlayerWithURL:url error:&AVerror];
    _backgroundPlayer.volume = _slider.value;
    _backgroundPlayer.loop = YES;
    if (!_backgroundPlayer) {
        [[[UIAlertView alloc] initWithTitle:@"Error"
                                    message:[NSString stringWithFormat:@"Couldn't start playback: %@", [AVerror localizedDescription]]
                                   delegate:nil
                          cancelButtonTitle:nil
                          otherButtonTitles:@"OK", nil] show];
        return;
    }

    //放完移除
    _backgroundPlayer.removeUponFinish = YES;
    __weak ViewController *weakSelf = self;
    _backgroundPlayer.completionBlock = ^{
        weakSelf.backgroundPlayer = nil;
    };
    [_audioController addChannels:@[_backgroundPlayer]];
}

//配乐音量slider滑动事件
- (void)sliderValueChanged:(UISlider *)slider
{
    if (_backgroundPlayer) _backgroundPlayer.volume = slider.value;
}

//录音按钮点击事件
- (void)recordBtnOnClick:(UIButton *)btn
{
    [[AVAudioSession sharedInstance] requestRecordPermission:^(BOOL granted) {
        if (granted) {
            //用户同意获取麦克风
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.1f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                btn.selected = !btn.selected;

                if (btn.selected) {
                    [self startRecord];
                }else {
                    [self finishRecord];
                }
            });

        }else {
            //用户不同意获取麦克风
            [HWProgressHUD showMessage:@"需要访问您的麦克风，请在“设置-隐私-麦克风”中允许访问。" duration:3.f];
        }
    }];
}

//开始录音
- (void)startRecord
{
    _auditionBtn.hidden = YES;
    [self.audioController start:NULL];
    _recorder = [[AERecorder alloc] initWithAudioController:_audioController];
    _path = [self getPath];

    NSError *error = NULL;
    if ( ![_recorder beginRecordingToFileAtPath:_path fileType:kAudioFileM4AType error:&error] ) {
        [[[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"Couldn't start recording: %@", [error localizedDescription]] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil] show];
        _recorder = nil;
        return;
    }

    [self.soundSource removeAllObjects];
    [self removeTimer];
    [self addRecordTimer];

    [_audioController addOutputReceiver:_recorder];
    [_audioController addInputReceiver:_recorder];
}

//结束录音
- (void)finishRecord
{
    _auditionBtn.hidden = NO;
    _recLabel.hidden = NO;
    [self removeTimer];

    [_recorder finishRecording];
    [_audioController removeOutputReceiver:_recorder];
    [_audioController removeInputReceiver:_recorder];
    _recorder = nil;
}

//添加录音定时器
- (void)addRecordTimer
{
    self.timer = [NSTimer scheduledTimerWithTimeInterval:.2f target:self selector:@selector(recordTimerAction) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}

//录音定时器事件
- (void)recordTimerAction
{
    //获取音频
    [CATransaction begin];
    [CATransaction setDisableActions:YES];
    Float32 inputAvg, inputPeak, outputAvg, outputPeak;
    [_audioController inputAveragePowerLevel:&inputAvg peakHoldLevel:&inputPeak];
    [_audioController outputAveragePowerLevel:&outputAvg peakHoldLevel:&outputPeak];
    [self.soundSource insertObject:[NSNumber numberWithFloat:(inputPeak + 18) * 2.8] atIndex:0];
    [CATransaction commit];
    _recordingDrawView.pointArray = _soundSource;

    //REC闪动
    _recLabel.hidden = (int)[self.recorder currentTime] % 2 == 1 ? YES : NO;

    //录音时间
    NSString *str = [self strWithTime:[self.recorder currentTime] interval:0.5f];
    if ([str intValue] < 0) str = @"录制时长：00:00";
    [self.recordTimeLabel setText:[NSString stringWithFormat:@"录制时长：%@", str]];
}

//移除定时器
- (void)removeTimer
{
    [self.timer invalidate];
    self.timer = nil;
}

//试听按钮点击事件
- (void)auditionBtnOnClick:(UIButton *)btn
{
    btn.selected = !btn.selected;

    if (btn.selected) {
        [self playRecord];
    }else {
        [self stopPlayRecord];
    }
}

//播放录音
- (void)playRecord
{
    //更新界面
    _recordBtn.hidden = YES;
    [_playTimeLabel setText:@"播放时长：00:00"];
    _playTimeLabel.hidden = NO;

    //取消背景音乐
    [self changeBackgroundMusic:(UIButton *)[self.view viewWithTag:100]];

    if (![[NSFileManager defaultManager] fileExistsAtPath:_path]) return;

    NSError *error = nil;
    _player = [AEAudioFilePlayer audioFilePlayerWithURL:[NSURL fileURLWithPath:_path] error:&error];
    if (!_player) {
        [[[UIAlertView alloc] initWithTitle:@"Error"
                                    message:[NSString stringWithFormat:@"Couldn't start playback: %@", [error localizedDescription]]
                                   delegate:nil
                          cancelButtonTitle:nil
                          otherButtonTitles:@"OK", nil] show];
        return;
    }

    [self addPlayTimer];
    _player.removeUponFinish = YES;

    __weak ViewController *weakSelf = self;
    _player.completionBlock = ^{
        weakSelf.player = nil;
        weakSelf.auditionBtn.selected = NO;
        [weakSelf stopPlayRecord];
    };
    [self.audioController start:NULL];
    [self.audioController addChannels:@[_player]];
}

//停止播放录音
- (void)stopPlayRecord
{
    _recordBtn.hidden = NO;
    _playTimeLabel.hidden = YES;
    [self removeTimer];
    if (_player) [_audioController removeChannels:@[_player]];
}

//添加播放定时器
- (void)addPlayTimer
{
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(playTimerAction) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}

//播放定时器事件
- (void)playTimerAction
{
    //播放时间
    NSString *str = [self strWithTime:[_player currentTime] interval:1.f];
    if ([str intValue] < 0) str = @"播放时长：00:00";
    [_playTimeLabel setText:[NSString stringWithFormat:@"播放时长：%@", str]];
}

//录制音频沙盒路径
- (NSString *)getPath
{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"YYYYMMddhhmmss"];
    NSString *recordName = [NSString stringWithFormat:@"%@.wav", [formatter stringFromDate:[NSDate date]]];
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:recordName];

    return path;
}

//时长长度转时间字符串
- (NSString *)strWithTime:(double)time interval:(CGFloat)interval
{
    int minute = (time * interval) / 60;
    int second = (int)(time * interval) % 60;

    return [NSString stringWithFormat:@"%02d:%02d", minute, second];
}

@end

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