多媒体之录音

#import "MainViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface MainViewController () <AVAudioRecorderDelegate, AVAudioPlayerDelegate>
@property (strong, nonatomic) IBOutlet UIButton *recButton;     // 录音按钮
@property (strong, nonatomic) IBOutlet UIButton *pauseButton;   // 暂停按钮
@property (strong, nonatomic) IBOutlet UIButton *playButton;    // 播放按钮
@property (strong, nonatomic) IBOutlet UIButton *stopButton;    // 停止按钮
@property (strong, nonatomic) IBOutlet UILabel *stateLabel;     // 状态标题
@property (strong, nonatomic) IBOutlet UIImageView *soundView;  // 音频强度视图
@property (strong, nonatomic) IBOutlet UIProgressView *progressView;    // 播放进度


@property (nonatomic, retain) AVAudioPlayer *player;            // 播放器对象
@property (nonatomic, retain) AVAudioRecorder *recorder;        // 录音机对象
@property (nonatomic, retain) NSTimer *timer;                   // 定时器


@end

@implementation MainViewController

#pragma mark - 控制器视图方法
- (void)viewDidLoad {
    [super viewDidLoad];

    [self unableClick:self.pauseButton];
    [self unableClick:self.playButton];
    [self unableClick:self.stopButton];
    
    self.progressView.progress = 0;

//    [self setAudioSession];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];

}



#pragma mark - 私有方法
/**
 *  设置音频会话
 */
-(void)setAudioSession{
    AVAudioSession *audioSession=[AVAudioSession sharedInstance];
    //设置为播放和录音状态，以便可以在录制完之后播放录音
    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    [audioSession setActive:YES error:nil];
}

/**
 *  取得录音文件保存路径
 *
 *  @return 录音文件路径
 */
-(NSURL *)getSavePath{
    NSString *urlStr = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    urlStr = [urlStr stringByAppendingPathComponent:[NSString stringWithFormat: @"sound.%@", @"wav"]];  //文件名的设置;
//    NSLog(@"录音文件地址 :%@",urlStr);
    NSURL *url = [NSURL fileURLWithPath:urlStr];
    return url;
}

/**
 *  取得录音文件设置
 *
 *  @return 录音设置
 */
-(NSDictionary *)getAudioSetting{
    NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
                                   
                                   [NSNumber numberWithFloat: 44100.0],AVSampleRateKey, //采样率
                                   
                                   [NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,  // 录音格式 (仅支持苹果自己的格式)
                                   
                                   [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,//采样位数默认 16
                                   
                                   [NSNumber numberWithInt: 2], AVNumberOfChannelsKey,//通道的数目
                                   
                                   [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,//大端还是小端是内存的组织方式
                                   
                                   [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,nil];//采样信号是整数还是浮点数
    return recordSetting;
/*
    NSMutableDictionary *dicM = [NSMutableDictionary dictionary];
    //设置录音格式 (仅支持苹果自己格式)
    [dicM setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];
    //设置录音采样率，8000是电话采样率，对于一般录音已经够了 (扯淡，，，根本不够)
    [dicM setObject:@(8000) forKey:AVSampleRateKey];
    //设置通道数目,这里采用单声道
    [dicM setObject:@(1) forKey:AVNumberOfChannelsKey];
    //每个采样点位数,分为8、16、24、32
    [dicM setObject:@(8) forKey:AVLinearPCMBitDepthKey];
    //是否使用浮点数采样
    [dicM setObject:@(YES) forKey:AVLinearPCMIsFloatKey];
    //....其他设置等
    return dicM;
*/
    
/*
    NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
    [NSNumber numberWithFloat: 8000],AVSampleRateKey, //采样率
    [NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
    [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,//采样位数 默认 16
    [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,//通道的数目
    [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,//大端还是小端 是内存的组织方式
    [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,//采样信号是整数还是浮点数
    [NSNumber numberWithInt: AVAudioQualityMedium],AVEncoderAudioQualityKey,//音频编码质量
    nil];
 */

}

/**
 *  获得录音机对象
 *
 *  @return 录音机对象
 */
-(AVAudioRecorder *)audioRecorder{
    if (!self.recorder) {
        //创建录音文件保存路径
        NSURL *url = [self getSavePath];
        NSLog(@"录音文件地址 :%@", url);
        //创建录音格式设置
        NSDictionary *setting = [self getAudioSetting];
        //创建录音机
        NSError *error=nil;
        self.recorder= [[AVAudioRecorder alloc]initWithURL:url settings:setting error:&error];
        self.recorder.delegate = self;
        self.recorder.meteringEnabled = YES;//如果要监控声波则必须设置为YES
        if (error) {
            NSLog(@"创建录音机对象时发生错误，错误信息：%@",error.localizedDescription);
            return nil;
        }
    }
    return self.recorder;
}

/**
 *  创建播放器
 *
 *  @return 播放器
 */
-(AVAudioPlayer *)audioPlayer{
    if (!self.player) {
        NSURL *url=[self getSavePath];
        NSError *error = nil;
        self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
        if (error) {
            NSLog(@"创建播放器过程中发生错误，错误信息：%@",error.localizedDescription);
            return nil;
        }
    }
    return self.player;
}

/**
 *  录音声波监控定制器
 *
 *  @return 定时器
 */
-(NSTimer *)timer{
    if (!_timer) {
        _timer=[NSTimer scheduledTimerWithTimeInterval:0.05f target:self selector:@selector(audioPowerChange) userInfo:nil repeats:YES];
    }
    return _timer;
}

/**
 *  录音声波状态设置
 */
-(void)audioPowerChange{
    float power = 0;
    if ([self.player isPlaying]) {
        [self.player updateMeters];
        power = [self.player averagePowerForChannel:0];
//        NSLog(@"%f, %f", self.player.currentTime, self.player.duration);
        self.progressView.progress = self.player.currentTime / self.player.duration;
    } else {
        [self.recorder updateMeters];//更新测量值
        power = [self.recorder averagePowerForChannel:0];//取得第一个通道的音频，注意音频强度范围时-160到0
    }
    CGFloat progress = (power + 100) * 3;
    self.soundView.bounds = CGRectMake(0, 0, progress, progress);
}


#pragma mark - UI事件
/**
 *  点击录音按钮
 *
 *  @param sender 录音按钮
 */
- (IBAction)recordClick:(UIButton *)sender {
    if (![self.recorder isRecording]) {
        self.recorder = [self audioRecorder];
        [self.recorder record];//首次使用应用时如果调用record方法会询问用户是否允许使用麦克风
        NSLog(@"录音机设置：%@", self.recorder.settings);
        self.timer.fireDate = [NSDate distantPast];
    }
    
    [self unableClick:self.recButton];
    [self unableClick:self.playButton];
    [self ableClick:self.pauseButton];
    [self ableClick:self.stopButton];
    self.stateLabel.text = @"录音中...";
    self.stateLabel.textColor = [UIColor redColor];
}

/**
 *  点击暂定按钮
 *
 *  @param sender 暂停按钮
 */
- (IBAction)pauseClick:(UIButton *)sender {
    if ([self.recorder isRecording]) {
        [self.recorder pause];
        self.timer.fireDate = [NSDate distantFuture];
        
        [self ableClick:self.recButton];
    } else if ([self.player isPlaying]) {
        [self.player pause];
        self.timer.fireDate = [NSDate distantFuture];
     
        [self ableClick:self.playButton];
    }
    [self unableClick:self.pauseButton];
    self.stateLabel.text = @"暂停中...";
    self.stateLabel.textColor = [UIColor orangeColor];
}

/**
 *  点击恢复按钮
 *  恢复录音只需要再次调用record，AVAudioSession会帮助你记录上次录音位置并追加录音
 *
 *  @param sender 恢复按钮
 */
- (IBAction)resumeClick:(UIButton *)sender {
    [self recordClick:sender];
}

/**
 *  点击停止按钮
 *
 *  @param sender 停止按钮
 */
- (IBAction)stopClick:(UIButton *)sender {
    
    if ([self.recorder isRecording]) {
        [self.recorder stop];
        self.timer.fireDate = [NSDate distantFuture];
        self.soundView.bounds = CGRectMake(0, 0, 57, 57);
        
    } else if ([self.player isPlaying]) {
        [self.player stop];
        self.player.currentTime = 0;
//        NSLog(@"%f", self.player.currentTime);
        self.timer.fireDate = [NSDate distantFuture];
        self.soundView.bounds = CGRectMake(0, 0, 57, 57);
    }
    
    [self unableClick:self.stopButton];
    [self ableClick:self.playButton];
    [self unableClick:self.pauseButton];
    [self ableClick:self.recButton];
    self.stateLabel.text = @"等待中...";
    self.stateLabel.textColor = [UIColor blackColor];
}

/**
 *  点击播放按钮
 *
 *  @param player 播放按钮
 */
- (IBAction)playClick:(id)sender {
    if (self.player.currentTime != 0) {
        [self.player play];
        self.timer.fireDate = [NSDate distantPast];
    } else {
        if (!self.player) {
            [self audioPlayer];
            self.player.volume = 1;
        }
        NSLog(@"播放器：%@", self.player.settings);
        self.player = [self.player initWithContentsOfURL:[self getSavePath] error:nil];
        self.player.meteringEnabled = YES;
        self.player.delegate = self;
        [self.player play];
        self.timer.fireDate = [NSDate distantPast];
    }
    
    
    [self unableClick:self.recButton];
    [self unableClick:self.playButton];
    [self ableClick:self.pauseButton];
    [self ableClick:self.stopButton];
    
    self.stateLabel.text = @"播放中...";
    self.stateLabel.textColor = [UIColor colorWithRed:0 green:156 / 255.0 blue:1 alpha:1];
}



#pragma mark - 录音机代理方法
/**
 *  录音完成，录音完成后播放录音
 *
 *  @param recorder 录音机对象
 *  @param flag     是否成功
 */
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
    self.soundView.bounds = CGRectMake(0, 0, 57, 57);
    NSLog(@"录音完成!");
}

#pragma mark - 播放器代理方法
/**
 *  播放完成，播放完成后停止计时器
 *
 *  @param player 播放器对象
 *  @param flag   是否成功
 */
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    self.soundView.bounds = CGRectMake(0, 0, 57, 57);
    self.progressView.progress = 0;
    NSLog(@"播放完毕");
    self.timer.fireDate = [NSDate distantFuture];
    
    [self unableClick:self.pauseButton];
    [self unableClick:self.stopButton];
    [self ableClick:self.recButton];
    [self ableClick:self.playButton];
    self.stateLabel.text = @"等待中...";
    self.stateLabel.textColor = [UIColor blackColor];
}

#pragma mark - 按扭状态方法
/**
 *  设置按钮可以被点击
 */
- (void)ableClick:(UIButton *)button
{
    button.alpha = 1;
    button.userInteractionEnabled = YES;
}

/**
 *  设置按钮不可被点击
 */
- (void)unableClick:(UIButton *)button
{
    button.alpha = 0.2;
    button.userInteractionEnabled = NO;
}
@end