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

Demo就不上传了，有想要的留下邮箱吧。

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