iOS 中 SystemSoundID（播放系统声音）和 A

作者: flyrees | 来源:发表于2017-11-03 14:53 被阅读0次

先来介绍一下SystemSoundID:

SystemSoundID简介

   AudioToolbox.framework是一套基于C语言的框架，使用它来播放音效其本质是将短音频注册到系统声音服务（System Sound Service）。System Sound Service是一种简单、底层的声音播放服务，但是它本身也存在着一些限制：

播放短的声音文件(支持振动)
你可以用它来播放一个短的声音（30秒以下）
这个接口不支持等级，位置，循环，时间的控制，同时播放功能。在同一时间，你只能播放一个声音。

------------注意：数据必须是PCM或者IMA4格式
----------注意：音频文件必须打包成.caf、.aif、.wav中的一种（注意这是官方文档的说法，实际测试发现一些.mp3也可以播放）

主要API：

创建对象：

OSStatus AudioServicesCreateSystemSoundID ( CFURLRef __nonnull inFileURL,SystemSoundID * __nonnull outSystemSoundID );

销毁对象：

OSStatus AudioServicesDisposeSystemSoundID ( SystemSoundID inSystemSoundID);

播放声音：（一共2个）
带有振动效果的播放：

void AudioServicesPlayAlertSound ( SystemSoundID inSystemSoundID );

void AudioServicesPlaySystemSound ( SystemSoundID inSystemSoundID );

播放完成之后执行的操作:(其中弟四个参数是一个C语言的函数)

OSStatus AudioServicesAddSystemSoundCompletion ( SystemSoundIDinSystemSoundID, CFRunLoopRef __nullable inRunLoop, CFStringRef __nullableinRunLoopMode, AudioServicesSystemSoundCompletionProc __nonnullinCompletionRoutine, void * __nullable inClientData );

用法详解：

        //1.获得音效文件的全路径
         NSURL *url=[[NSBundle mainBundle] URLForResource:@"4.wav" withExtension:nil];

         //2.加载音效文件，创建音效ID（SoundID,一个ID对应一个音效文件）
         SystemSoundID soundID = 0;
         AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID);

         //把需要销毁的音效文件的ID传递给它既可销毁
         //AudioServicesDisposeSystemSoundID(soundID);

        // 完成播放之后执行的soundCompleteCallback函数
         AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);

         //3.播放音效文件
         //下面的两个函数都可以用来播放音效文件，第一个函数伴随有震动效果
         AudioServicesPlayAlertSound(soundID);
         //AudioServicesPlaySystemSound(<#SystemSoundID inSystemSoundID#>)

#pragma mark - 播放完成之后执行的函数
void soundCompleteCallback()
{
    NSLog(@"播放完成");
}

AVAudioRecorder简介：
使用一个录音机,您可以:

```
      录制,直到用户停止录音
```

      在一个特定的时间录制声音

```
      暂停和恢复录制
```

      记录获得输入音频电平数据,您可以使用它们来提供计量水平

说明：
在创建录音机时除了指定路径外还必须指定录音设置信息，因为录音机必须知道录音文件的格式、采样率、通道数、每个采样点的位数等信息，但是也并不是所有的信息都必须设置，通常只需要几个常用设置。关于录音设置详见帮助文档中的“AV Foundation Audio Settings Constants”。
————注意：录音的时候必须设置AVAudioSession，否则将无法录音

/** * 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]; }

主要API：
初始化：

- (instancetype nullable)initWithURL:(NSURL * nonnull)url settings:(NSDictionary<NSString *,id> * nonnull)settings error:(NSError * nullable * nullable)outError

是否准备好录音：

- (BOOL)prepareToRecord

录音：

- (BOOL)record

暂停:

- (void)pause

停止：

- (void)stop

从一个特定的时间开始录制：

- (BOOL)recordAtTime:(NSTimeInterval)time

录音的设置：（特别重要）

@property(readonly) NSDictionary <NSString *,id> *settings

是否启动音频测量：

//是否启用音频测量，默认为NO，一旦启用音频测量可以通过updateMeters方法更新测量值
@property(getter=isMeteringEnabled) BOOL meteringEnabled

更新音频测量值：

//更新音频测量值，注意如果要更新音频测量值必须设置meteringEnabled为YES，通过音频测量值可以即时获得音频分贝等信息
- (void)updateMeters

获取指定声道的分贝值：

//获得指定声道的分贝峰值，注意如果要获得分贝峰值必须在此之前调用updateMeters方法
- (float)peakPowerForChannel:(NSUInteger)channelNumber;

再来看一下代码的实现:

//
//  ViewController.m
//  SystemSoundle播放音频
//
//  Created by dlios on 15/12/8.
//  Copyright © 2015年 PFG. All rights reserved.
//

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

@interface ViewController ()
@property (nonatomic, strong)UIButton *playerButton;
@property (nonatomic, strong)UIButton *recorderButton;
@property (nonatomic, strong)UIButton *avAudionButton;
@property (nonatomic, strong)UIImageView *imageView;
@property (nonatomic, strong)UIImageView *imageViewSound;

@property (nonatomic, strong)AVAudioRecorder *reverb;
@property (nonatomic, strong)NSMutableDictionary *recordSetting;
@property (nonatomic, strong)AVAudioPlayer *player;
@property (nonatomic, strong)NSString *path;
@property (nonatomic, strong)NSTimer *timer;
@property (nonatomic, assign)double lowPassResults;
@property (nonatomic, strong)NSArray *arrayImage;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor grayColor];
    
    AVAudioSession *session = [[AVAudioSession alloc] init];
    //设置会话的工作模式
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    
    
    [self creatControl];
    //设置录音的格式
    [self creatSetting];
}
- (void)creatControl
{
    self.playerButton = [UIButton buttonWithType:UIButtonTypeCustom];
    
    [self.playerButton setBackgroundColor:[UIColor colorWithRed:arc4random() % 255 / 255. green:arc4random() % 255 / 255. blue:arc4random() % 255 / 255. alpha:.6]];
   
    [self.playerButton setFrame:CGRectMake(0, 0, 100, 40)];
   
    [self.playerButton setCenter:CGPointMake(self.view.frame.size.width / 2, 260)];
  
    [self.playerButton setTitleColor:[UIColor colorWithRed:arc4random() % 225 / 255. green:arc4random() % 225 / 255. blue:arc4random() % 225 / 255. alpha:1] forState:UIControlStateNormal];
   
    [self.playerButton setTitle:@"播放音效" forState:UIControlStateNormal];
    
    [self.playerButton addTarget:self action:@selector(player:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.playerButton];
    
    
    self.recorderButton = [UIButton buttonWithType:UIButtonTypeCustom];
   
    [self.recorderButton setBackgroundColor:[UIColor colorWithRed:arc4random() % 255 / 255. green:arc4random() % 255 / 255. blue:arc4random() % 255 / 255. alpha:.6]];
   
    [self.recorderButton setTitle:@"按住录音" forState:UIControlStateNormal];
   
    [self.recorderButton setTitle:@"松开结束" forState:UIControlStateHighlighted];
   
    [self.recorderButton setTitleColor:[UIColor colorWithRed:arc4random() % 225 / 255. green:arc4random() % 225 / 255. blue:arc4random() % 225 / 255. alpha:1] forState:UIControlStateNormal];
   
    [self.recorderButton setFrame:CGRectMake(0, 0, 100, 40)];
   
    [self.recorderButton setCenter:CGPointMake(self.view.frame.size.width / 2, 360)];
   
    //按下
    [self.recorderButton addTarget:self action:@selector(recorderButton:) forControlEvents:UIControlEventTouchDown];
   
    //松开
    [self.recorderButton addTarget:self action:@selector(handleStop:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.recorderButton];
    
    
    self.avAudionButton = [UIButton buttonWithType:UIButtonTypeCustom];
   
    [self.avAudionButton setBackgroundColor:[UIColor colorWithRed:arc4random() % 255 / 255. green:arc4random() % 255 / 255. blue:arc4random() % 255 / 255. alpha:.6]];
   
    [self.avAudionButton setFrame:CGRectMake(0, 0, 100, 40)];
   
    [self.avAudionButton setCenter:CGPointMake(self.view.frame.size.width / 2, 460)];
   
    [self.avAudionButton setTitleColor:[UIColor colorWithRed:arc4random() % 225 / 255. green:arc4random() % 225 / 255. blue:arc4random() % 225 / 255. alpha:1] forState:UIControlStateNormal];
   
    [self.avAudionButton setTitle:@"播放本地" forState:UIControlStateNormal];
   
    [self.avAudionButton addTarget:self action:@selector(avAudionButton:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.avAudionButton];
    
    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 100, 30, 60)];
   
    [self.imageView setImage:[UIImage imageNamed:@"RecordingBkg"]];
    [self.view addSubview:self.imageView];
    
    //音量图片数组
    self.arrayImage = @[@"RecordingSignal001",@"RecordingSignal002",@"RecordingSignal003",
                       @"RecordingSignal004", @"RecordingSignal005",@"RecordingSignal006",
                       @"RecordingSignal007",@"RecordingSignal008"];
    
    self.imageViewSound = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 20, 60)];
    [self.view addSubview:self.imageViewSound];
}
- (void)creatSetting
{
    self.recordSetting = [[NSMutableDictionary alloc]init];
   
    //设置录音格式  AVFormatIDKey==kAudioFormatLinearPCM
    [self.recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
   
    //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
   
    [self.recordSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];
   
    //录音通道数  1 或 2
    [self.recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
   
    //线性采样位数  8、16、24、32
    [self.recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
   
    //录音的质量
    [self.recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];
}

#pragma mark - 播放音效
- (void)player:(UIButton *)button
{
    //1.获得音效文件的全路径
    NSString *str = [[NSBundle mainBundle] pathForResource:@"4" ofType:@"wav"];
    NSURL *url = [NSURL fileURLWithPath:str];
    
    //2.加载音效文件，创建音效ID（SoundID,一个ID对应一个音效文件）
    SystemSoundID soundID = 0;

    //创建声音文件对象
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID);
    
    //3.播放音效文件(带振动)
    AudioServicesPlayAlertSound(soundID);
    
    
    // 完成播放之后执行的soundCompleteCallback函数
    AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);
    
    //把需要销毁的音效文件的ID传递给它既可销毁
//    AudioServicesDisposeSystemSoundID(soundID);
    
}
#pragma mark - 播放完成之后执行的函数
void soundCompleteCallback()
{
    NSLog(@"播放完成");
}
#pragma mark - 按下方法
- (void)recorderButton:(UIButton *)button
{
    self.path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:@"aa.aac"];

    NSLog(@"%@", self.path);

    self.reverb = nil;

    NSError *error = nil;

    self.reverb = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:self.path] settings:self.recordSetting error:&error];
    
    //开启音量检查
    self.reverb.meteringEnabled = YES;
    
    if ([self.reverb prepareToRecord]) {
        [self.reverb record];
        
        self.timer = [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(timerClick:) userInfo:nil repeats:YES];
                
    }else{
        NSLog(@"录音没准备好:%@", error);
    }
}
#pragma mark - 松开方法
- (void)handleStop:(UIButton *)button
{
    [self.reverb stop];
    
    self.reverb = nil;
    
    //销毁定时器
    [self.timer invalidate];
    
    self.timer = nil;
    
    //将图片值为空
    self.imageViewSound.image = [UIImage imageNamed:@""];
}

- (void)avAudionButton:(UIButton *)button
{
    self.player = nil;

    //创建播放对象
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:self.path] error:nil];

    if ([self.player prepareToPlay]) {

        [self.player play];

    }else{

        NSLog(@"播放器没有准备好");

    }
}
#pragma mark - 定时器方法
- (void)timerClick:(NSTimer *)timer
{
    //更新分值
    [self.reverb updateMeters];
    
    //call to refresh meter values刷新平均和峰值功率,此计数是以对数刻度计量的,-160表示完全安静，0表示最大输入值
    // 获取指定声道的分贝值：
    const double ALPHA = 0.05;

    double peakPowerForChannel = pow(10, (0.05 * [self.reverb peakPowerForChannel:0]));

    self.lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * self.lowPassResults;
    
    if (self.lowPassResults>=0.8) {

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:7]];

    }else if(self.lowPassResults>=0.7){

        self.imageViewSound.image = [UIImage imageNamed:
[self.arrayImage objectAtIndex:6]];

    }else if(self.lowPassResults>=0.6){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:5]];

    }else if(self.lowPassResults>=0.5){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:4]];

    }else if(self.lowPassResults>=0.4){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:3]];

    }else if(self.lowPassResults>=0.3){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:2]];

    }else if(self.lowPassResults>=0.2){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:1]];

    }else if(self.lowPassResults>=0.1){

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:0]];

    }else{

        self.imageViewSound.image = [UIImage imageNamed:[self.arrayImage objectAtIndex:0]];

    }    
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

iOS 中 SystemSoundID（播放系统声音）和 A

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