几种播放音频文件的方式（二） —— 音效播放

版本记录

版本号	时间
V1.0	2017.12.26

前言

ios系统中有很多方式可以播放音频文件，这里我们就详细的说明下播放音乐文件的原理和实例。感兴趣的可以看我写的上面几篇。
1. 几种播放音频文件的方式（一） —— 播放本地音乐

功能需求

音效播放，音频文件必须打包成.caf、.aif、.wav中的一种。有时候有的mp3格式的声音文件也能播放，而且API限制了时间不能超过30s。

---

功能实现

这里同样使用框架 #import

1. 几个函数说明

由于该框架是基于C的框架，这里使用了其中的几个函数，下面我们就解析一下。

创建音效的ID，音效的播放和销毁都靠这个ID来执行。

• AudioServicesCreateSystemSoundID(CFURLRef inFileURL, SystemSoundID* outSystemSoundID)

/*!
    @functiongroup  AudioServices
*/

/*!
    @function       AudioServicesCreateSystemSoundID
    @abstract       Allows the application to designate an audio file for playback by the System Sound server.
    @discussion     Returned SystemSoundIDs are passed to AudioServicesPlayAlertSoundWithCompletion() 
                    and AudioServicesPlaySystemSoundWithCompletion() to be played.
 
                    The maximum supported duration for a system sound is 30 secs.
    @param          inFileURL
                        A CFURLRef for an AudioFile.
    @param          outSystemSoundID
                        Returns a SystemSoundID.
*/
extern OSStatus 
AudioServicesCreateSystemSoundID(   CFURLRef                    inFileURL,
                                    SystemSoundID*              outSystemSoundID)
                                                                __OSX_AVAILABLE_STARTING(__MAC_10_5,__IPHONE_2_0);

30s的音效限制就是在这里说明的。

播放音效

• AudioServicesPlaySystemSound(SystemSoundID inSystemSoundID)

/*!
    This function will be deprecated in a future release. Use AudioServicesPlaySystemSoundWithCompletion instead.
 
    @function       AudioServicesPlaySystemSound
    @abstract       Play the sound designated by the provided SystemSoundID.
    @discussion     A SystemSoundID indicating the desired System Sound to be played.
    @param          inSystemSoundID
                        A SystemSoundID for the System Sound server to play.
*/
extern void 
AudioServicesPlaySystemSound(SystemSoundID inSystemSoundID)                                         
                                                                __OSX_AVAILABLE_STARTING(__MAC_10_5,__IPHONE_2_0);

销毁音效的播放

• AudioServicesDisposeSystemSoundID(SystemSoundID inSystemSoundID)

/*!
    @function       AudioServicesDisposeSystemSoundID
    @abstract       Allows the System Sound server to dispose any resources needed for the provided
                    SystemSoundID.
    @discussion     Allows the application to tell the System Sound server that the resources for the
                    associated audio file are no longer required.
    @param          inSystemSoundID
                        A SystemSoundID that the application no longer needs to use.
*/
extern OSStatus 
AudioServicesDisposeSystemSoundID(SystemSoundID inSystemSoundID)                                    
                                                                __OSX_AVAILABLE_STARTING(__MAC_10_5,__IPHONE_2_0);

ios9以前判断音效的完成

• AudioServicesAddSystemSoundCompletion(SystemSoundID inSystemSoundID,CFRunLoopRef __nullable inRunLoop, CFStringRef __nullable inRunLoopMode,AudioServicesSystemSoundCompletionProc inCompletionRoutine,void * __nullable inClientData)

/*!
    This function will be deprecated in a future release. Use AudioServicesPlayAlertSoundWithCompletion 
    or AudioServicesPlaySystemSoundWithCompletion instead.
 
    @function       AudioServicesAddSystemSoundCompletion
    @abstract       Call the provided Completion Routine when provided SystemSoundID
                    finishes playing.
    @discussion     Once set, the System Sound server will send a message to the System Sound client
                    indicating which SystemSoundID has finished playing.
    @param          inSystemSoundID
                        The SystemSoundID to associate with the provided completion
                        routine.
    @param          inRunLoop
                        A CFRunLoopRef indicating the desired run loop the completion routine should
                        be run on. Pass NULL to use the main run loop.
    @param          inRunLoopMode
                        A CFStringRef indicating the run loop mode for the runloop where the
                        completion routine will be executed. Pass NULL to use kCFRunLoopDefaultMode.
    @param          inCompletionRoutine
                        An AudioServicesSystemSoundCompletionProc to be called when the provided
                        SystemSoundID has completed playing in the server.
    @param          inClientData
                        A void* to pass client data to the completion routine.
*/
extern OSStatus 
AudioServicesAddSystemSoundCompletion(  SystemSoundID                                       inSystemSoundID,
                                        CFRunLoopRef __nullable                             inRunLoop,
                                        CFStringRef __nullable                              inRunLoopMode,
                                        AudioServicesSystemSoundCompletionProc              inCompletionRoutine,
                                        void * __nullable                                   inClientData)
                                                                    __OSX_AVAILABLE_STARTING(__MAC_10_5,__IPHONE_2_0);

ios9及其以后判断音效的完成

• AudioServicesPlayAlertSoundWithCompletion( SystemSoundID inSystemSoundID,void (^__nullable inCompletionBlock)(void))

/*!
    @function       AudioServicesPlayAlertSoundWithCompletion
    @abstract       Play an alert sound
    @discussion     Play the sound designated by the provided SystemSoundID with alert sound behavior.
    @param          inSystemSoundID
                        The SystemSoundID to be played. On the desktop the kSystemSoundID_UserPreferredAlert
                        constant can be passed in to play back the alert sound selected by the user
                        in System Preferences. On iOS there is no preferred user alert sound.
    @param          inCompletionBlock
                        The completion block gets executed for every attempt to play a system sound irrespective
                        of success or failure. The callbacks are issued on a serial queue and the client is
                        responsible for handling thread safety.
*/
extern void
AudioServicesPlayAlertSoundWithCompletion(  SystemSoundID inSystemSoundID,
                                            void (^__nullable inCompletionBlock)(void))
                                                                    __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0);

• AudioServicesPlaySystemSoundWithCompletion(SystemSoundID inSystemSoundID, void (^__nullable inCompletionBlock)(void))

/*!
    @function       AudioServicesPlaySystemSoundWithCompletion
    @abstract       Play a system sound
    @discussion     Play the sound designated by the provided SystemSoundID.
    @param          inSystemSoundID
                        The SystemSoundID to be played.
    @param          inCompletionBlock
                        The completion block gets executed for every attempt to play a system sound irrespective 
                        of success or failure. The callbacks are issued on a serial queue and the client is 
                        responsible for handling thread safety.
*/
extern void
AudioServicesPlaySystemSoundWithCompletion(     SystemSoundID inSystemSoundID,
                                                void (^__nullable inCompletionBlock)(void))
                                                                        __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0);

带有震动的播放

• AudioServicesPlayAlertSound(SystemSoundID inSystemSoundID)

/*!
    This function will be deprecated in a future release. Use AudioServicesPlayAlertSoundWithCompletion instead.
 
    @function       AudioServicesPlayAlertSound
    @abstract       Play an Alert Sound
    @discussion     Play the provided SystemSoundID with AlertSound behavior.
    @param          inSystemSoundID
                        A SystemSoundID for the System Sound server to play. On the desktop you
                        can pass the kSystemSoundID_UserPreferredAlert constant to playback the alert sound 
                        selected by the user in System Preferences. On iOS there is no preferred user alert sound.
*/
extern void 
AudioServicesPlayAlertSound(SystemSoundID inSystemSoundID)                                          
                                                                __OSX_AVAILABLE_STARTING(__MAC_10_5,__IPHONE_2_0);

2. 代码实现

下面直接看代码

#import "ViewController.h"
#import 

@interface ViewController ()

@end

@implementation ViewController

static SystemSoundID soundID = 0;

#pragma mark -  Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    //UI界面
    [self initUI];
}

#pragma mark -  Object Private Function

void soundCompleteCallBack(SystemSoundID soundID, void * clientDate)
{
    NSLog(@"播放完成");
    AudioServicesDisposeSystemSoundID(soundID);
}

- (void)playMusic
{
    //获取资源地址
    NSString *str = [[NSBundle mainBundle] pathForResource:@"sound" ofType:@"m4a"];
    NSURL *url = [NSURL fileURLWithPath:str];
    
    // 创建音效的ID，音效的播放和销毁都靠这个ID来执行
    AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &soundID);
    
    //带有声音和震动的播放
    if ([UIDevice currentDevice].systemVersion.floatValue >= 9.0) {
        AudioServicesPlayAlertSoundWithCompletion(soundID, ^{
            NSLog(@"播放完成");
        });
    }
    else {
        AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, soundCompleteCallBack, NULL);
    };
}

- (void)stopMusic
{
    AudioServicesDisposeSystemSoundID(soundID);
}

- (void)initUI
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake((self.view.bounds.size.width - 200.0) * 0.5, (self.view.bounds.size.height - 200.0) * 0.5, 200.0, 200.0);
    button.backgroundColor = [UIColor lightGrayColor];
    button.layer.cornerRadius = 100.0;
    button.layer.masksToBounds = YES;
    [button setTitle:@"开始播放" forState:UIControlStateNormal];
    [button setTitle:@"停止播放" forState:UIControlStateSelected];
    [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
    [button addTarget:self action:@selector(playButtonDidClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

#pragma mark -  Action && Notification

- (void)playButtonDidClick:(UIButton *)button
{
    button.selected = !button.selected;
    
    if (button.selected) {
        [self playMusic];
    }
    else {
        [self stopMusic];
    }
}

@end

这里是播放声音的同时，AudioServicesPlayAlertSoundWithCompletion，也有震动。

---

功能验证

这里带有声音和震动，我就没办法给大家验证了，只能给出一个基本的界面。

开始播放

停止播放

后记

未完，待续~~~