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:
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