iOS 中 SystemSoundID（播放系統(tǒng)聲音） 和 AVAudioRecorder （錄音）

? ? ? ? ? ?SystemSoundID:SystemSoundID簡(jiǎn)介? AudioToolbox.framework是一套基于C語(yǔ)言的框架，使用它來(lái)播放音效其本質(zhì)是將短音頻注冊(cè)到系統(tǒng)聲音服務(wù)（System Sound Service）。

? ? ? ? ? ? System Sound Service是一種簡(jiǎn)單、底層的聲音播放服務(wù)，但是它本身也存在著一些限制：12播放短的聲音文件(支持振動(dòng))你可以用它來(lái)播放一個(gè)短的聲音（30秒以下）這個(gè)接口不支持等級(jí)，位置，循環(huán)，時(shí)間的控制，同時(shí)播放功能。在同一時(shí)間，你只能播放一個(gè)聲音。————注意：數(shù)據(jù)必須是PCM或者IMA4格式 ———-注意：音頻文件必須打包成.caf、.aif、.wav中的一種（注意這是官方文檔的說(shuō)法，實(shí)際測(cè)試發(fā)現(xiàn)一些.mp3也可以播放）

? ? ? ? ? ? ?主要API：

創(chuàng)建對(duì)象：OSStatus AudioServicesCreateSystemSoundID ( CFURLRef __nonnull inFileURL,SystemSoundID * __nonnull outSystemSoundID );

1銷毀對(duì)象：OSStatus AudioServicesDisposeSystemSoundID ( SystemSoundID inSystemSoundID);

1播放聲音：（一共2個(gè)） 帶有振動(dòng)效果的播放：void AudioServicesPlayAlertSound ( SystemSoundID inSystemSoundID );void AudioServicesPlaySystemSound ( SystemSoundID inSystemSoundID );

123播放完成之后執(zhí)行的操作:(其中弟四個(gè)參數(shù)是一個(gè)C語(yǔ)言的函數(shù))OSStatus AudioServicesAddSystemSoundCompletion ( SystemSoundIDinSystemSoundID, CFRunLoopRef __nullable inRunLoop, CFStringRef __nullableinRunLoopMode, AudioServicesSystemSoundCompletionProc __nonnullinCompletionRoutine, void * __nullable inClientData );

1用法詳解：用法詳解：? ? ? ? //1.獲得音效文件的全路徑? ? ? ? NSURL *url=[[NSBundle mainBundle] URLForResource:@"4.wav" withExtension:nil];? ? ? ? //2.加載音效文件，創(chuàng)建音效ID（SoundID,一個(gè)ID對(duì)應(yīng)一個(gè)音效文件）? ? ? ? SystemSoundID soundID = 0;? ? ? ? AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID);? ? ? ? //把需要銷毀的音效文件的ID傳遞給它既可銷毀? ? ? ? //AudioServicesDisposeSystemSoundID(soundID);? ? ? ? // 完成播放之后執(zhí)行的soundCompleteCallback函數(shù)? ? ? ? AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);? ? ? ?

?//3.播放音效文件? ? ? ? //下面的兩個(gè)函數(shù)都可以用來(lái)播放音效文件，第一個(gè)函數(shù)伴隨有震動(dòng)效果? ? ? ? AudioServicesPlayAlertSound(soundID);? ? ? ? //AudioServicesPlaySystemSound(<#SystemSoundID inSystemSoundID#>)#pragma mark - 播放完成之后執(zhí)行的函數(shù)void soundCompleteCallback(){? ? NSLog(@"播放完成");}

? ? ? ? ? ?AVAudioRecorder簡(jiǎn)介 ： 使用一個(gè)錄音機(jī),您可以:錄制,直到用戶停止錄音在一個(gè)特定的時(shí)間錄制聲音暫停和恢復(fù)錄制記錄獲得輸入音頻電平數(shù)據(jù),您可以使用它們來(lái)提供計(jì)量水平說(shuō)明： 在創(chuàng)建錄音機(jī)時(shí)除了指定路徑外還必須指定錄音設(shè)置信息，因?yàn)殇浺魴C(jī)必須知道錄音文件的格式、采樣率、通道數(shù)、每個(gè)采樣點(diǎn)的位數(shù)等信息，但是也并不是所有的信息都必須設(shè)置，通常只需要幾個(gè)常用設(shè)置。關(guān)于錄音設(shè)置詳見幫助文檔中的“AV Foundation Audio Settings Constants”。 ————注意：錄音的時(shí)候必須設(shè)置AVAudioSession，否則將無(wú)法錄音/* 設(shè)置音頻會(huì)話 */-(void)setAudioSession{ AVAudioSession *audioSession=[AVAudioSession sharedInstance];1//設(shè)置為播放和錄音狀態(tài)，以便可以在錄制完之后播放錄音[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; [audioSession setActive:YES error:nil]; }

? ? ? ? ? ?1主要API： 初始化：- (instancetype nullable)initWithURL:(NSURL * nonnull)url settings:(NSDictionary* nonnull)settings error:(NSError * nullable * nullable)outError

1是否準(zhǔn)備好錄音：- (BOOL)prepareToRecord

1錄音：- (BOOL)record1暫停:- (void)pause

1停止：- (void)stop

1從一個(gè)特定的時(shí)間開始錄制：- (BOOL)recordAtTime:(NSTimeInterval)time

1錄音的設(shè)置：（特別重要）@property(readonly) NSDictionary*settings

1是否啟動(dòng)音頻測(cè)量：//是否啟用音頻測(cè)量，默認(rèn)為NO，一旦啟用音頻測(cè)量可以通過(guò)updateMeters方法更新測(cè)量值@property(getter=isMeteringEnabled) BOOL meteringEnabled

12更新音頻測(cè)量值：//更新音頻測(cè)量值，注意如果要更新音頻測(cè)量值必須設(shè)置meteringEnabled為YES，通過(guò)音頻測(cè)量值可以即時(shí)獲得音頻分貝等信息- (void)updateMeters

12獲取指定聲道的分貝值：//獲得指定聲道的分貝峰值，注意如果要獲得分貝峰值必須在此之前調(diào)用updateMeters方法- (float)peakPowerForChannel:(NSUInteger)channelNumber;

12再來(lái)看一下代碼的實(shí)現(xiàn):////? ViewController.m//? SystemSoundle播放音頻

//#import "ViewController.h"#import@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];

//設(shè)置會(huì)話的工作模式

[session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

[self creatControl];

//設(shè)置錄音的格式

[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:@"按住錄音" forState:UIControlStateNormal];

[self.recorderButton setTitle:@"松開結(jié)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];

//松開

[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];

//音量圖片數(shù)組

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];

//設(shè)置錄音格式? AVFormatIDKey==kAudioFormatLinearPCM

[self.recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];

//設(shè)置錄音采樣率(Hz) 如：AVSampleRateKey==8000/44100/96000（影響音頻的質(zhì)量）

[self.recordSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];

//錄音通道數(shù)? 1 或 2

[self.recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];

//線性采樣位數(shù)? 8、16、24、32

[self.recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];

//錄音的質(zhì)量

[self.recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

}

#pragma mark - 播放音效

- (void)player:(UIButton *)button

{

//1.獲得音效文件的全路徑

NSString *str = [[NSBundle mainBundle] pathForResource:@"4" ofType:@"wav"];

NSURL *url = [NSURL fileURLWithPath:str];

//2.加載音效文件，創(chuàng)建音效ID（SoundID,一個(gè)ID對(duì)應(yīng)一個(gè)音效文件）

SystemSoundID soundID = 0;

//創(chuàng)建聲音文件對(duì)象

AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID);

//3.播放音效文件(帶振動(dòng))

AudioServicesPlayAlertSound(soundID);

// 完成播放之后執(zhí)行的soundCompleteCallback函數(shù)

AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallback, NULL);

//把需要銷毀的音效文件的ID傳遞給它既可銷毀

//? ? AudioServicesDisposeSystemSoundID(soundID);

}

#pragma mark - 播放完成之后執(zhí)行的函數(shù)

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];

//開啟音量檢查

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(@"錄音沒(méi)準(zhǔn)備好:%@", error);

}

}

#pragma mark - 松開方法

- (void)handleStop:(UIButton *)button

{

[self.reverb stop];

self.reverb = nil;

//銷毀定時(shí)器

[self.timer invalidate];

self.timer = nil;

//將圖片值為空

self.imageViewSound.image = [UIImage imageNamed:@""];

}

- (void)avAudionButton:(UIButton *)button

{

self.player = nil;

//創(chuàng)建播放對(duì)象

self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:self.path] error:nil];

if ([self.player prepareToPlay]) {

[self.player play];

}else{

NSLog(@"播放器沒(méi)有準(zhǔn)備好");

}

}

#pragma mark - 定時(shí)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,此計(jì)數(shù)是以對(duì)數(shù)刻度計(jì)量的,-160表示完全安靜，0表示最大輸入值

// 獲取指定聲道的分貝值：

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

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