一个简单的混音播放器，处理中断

简单的来说其实就是创建多个播放器，分别设置播放器的声道，音量，速率，已达到混音的效果，难度不大，简单的封装一下。

文件目录如下



AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

AVAudioSession * session = [AVAudioSession sharedInstance];
NSError * error;

if (![session setCategory:AVAudioSessionCategoryPlayback error:&error]) {
NSLog(@"Category Error : %@", [error localizedDescription]);
}
if (![session setActive:YES error:&error]) {
NSLog(@"Category Error : %@", [error localizedDescription]);
}

// Override point for customization after application launch.
return YES;
}

　　

封装的类

//
//  SiPlayerController.h
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol SiPlayerControllerDelegate <NSObject>

- (void)playbackStop;

- (void)playbackBegan;

@end

@interface SiPlayerController : NSObject

@property (nonatomic, readonly, getter=isPlaying) BOOL playing;

@property (nonatomic, weak) id <SiPlayerControllerDelegate> delegate;

//方法
- (void)play;

- (void)stop;

//播放速率
- (void)adjustRate:(float)rate;

//对player环绕声设置，取值范围（-1.0极左 ~ 1.0极有右，0.0中间）
- (void)adjustPan:(float)pan forPlayerAtIndex:(NSUInteger)index;

//音量大小设置
- (void)adjustVolume:(float)volume forPlayerAtIndex:(NSUInteger)index;

@end

　　

//
//  SiPlayerController.m
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

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

@interface SiPlayerController()

@property (nonatomic) BOOL playing;
@property (nonatomic, strong) NSArray * playersArray;

@end

@implementation SiPlayerController

- (instancetype)init
{
self = [super init];
if (self) {
AVAudioPlayer * play1 = [self playForFile:@"1"];
AVAudioPlayer * play2 = [self playForFile:@"2"];
_playersArray = @[play1, play2];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleRouteChanged:) name:AVAudioSessionRouteChangeNotification object:[AVAudioSession sharedInstance]];

}
return self;
}

- (void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)handleRouteChanged:(NSNotification *)notification{
NSDictionary * dict = notification.userInfo;
AVAudioSessionRouteChangeReason reason = [dict[AVAudioSessionRouteChangeReasonKey] unsignedIntegerValue];

if (reason == AVAudioSessionRouteChangeReasonOldDeviceUnavailable) {

AVAudioSessionRouteDescription * previousRoute = dict[AVAudioSessionRouteChangePreviousRouteKey];

AVAudioSessionPortDescription * previousOutput = previousRoute.outputs[0];

NSString * portType = previousOutput.portType;

if ([portType isEqualToString:AVAudioSessionPortHeadphones]) {
[self stop];
[self.delegate playbackStop];
}
}
}

- (void)handleInterruption:(NSNotification *)notification{
NSDictionary * dict = notification.userInfo;
AVAudioSessionInterruptionType type = [dict[AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];

if (type == AVAudioSessionInterruptionTypeBegan) {
//处理中断开始
[self stop];
if (self.delegate) {
[self.delegate playbackStop];
}
}else{
//处理中断结束
AVAudioSessionInterruptionOptions options = [dict[AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];

if (options == AVAudioSessionInterruptionOptionShouldResume) {
[self play];
if (self.delegate) {
[self.delegate playbackBegan];
}
}
}
}

- (AVAudioPlayer *)playForFile:(NSString *)name{

NSURL * url = [[NSBundle mainBundle] URLForResource:name withExtension:@"mp3"];
NSError * error;
AVAudioPlayer * player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];

if (player) {
//循环计数为-1
player.numberOfLoops = -1;
//可以对播放熟虑进行设置
player.enableRate = YES;
[player prepareToPlay];
}else{
NSLog(@"Create Player Error: %@", [error localizedDescription]);
}
return player;
}

- (void)play{
if (!self.playing) {
NSTimeInterval delayTime = [self.playersArray[0] deviceCurrentTime] + 0.01;
for (AVAudioPlayer * player in self.playersArray) {
[player playAtTime:delayTime];
}
self.playing = YES;
}
}

- (void)stop{
if (self.playing) {
for (AVAudioPlayer * player in self.playersArray) {
[player stop];
player.currentTime = 0.0f;
}
self.playing = NO;
}
}

- (void)adjustRate:(float)rate{
for (AVAudioPlayer * player in self.playersArray) {
player.rate = rate;
}
}

- (BOOL)isValidIndex:(NSUInteger)index{
return index == 0 || index < self.playersArray.count;
}

- (void)adjustPan:(float)pan forPlayerAtIndex:(NSUInteger)index{
if ([self isValidIndex:index]) {
AVAudioPlayer * player = self.playersArray[index];
player.pan = pan;
}
}

- (void)adjustVolume:(float)volume forPlayerAtIndex:(NSUInteger)index{
if ([self isValidIndex:index]) {
AVAudioPlayer * player = self.playersArray[index];
player.volume = volume;
}
}

@end

　　

ViewController

//
//  ViewController.m
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

#import "ViewController.h"
#import "SiPlayerController.h"

@interface ViewController ()

@property (nonatomic, strong)SiPlayerController * player;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

_player = [[SiPlayerController alloc]init];

// Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)playerOnePan:(UISlider *)sender {
[_player adjustPan:sender.value forPlayerAtIndex:0];

}

- (IBAction)playerTwoPan:(UISlider *)sender {
[_player adjustPan:sender.value forPlayerAtIndex:1];
}

- (IBAction)playerOneVolume:(UISlider *)sender {
[_player adjustVolume:sender.value forPlayerAtIndex:0];
}

- (IBAction)playerTwoVolume:(UISlider *)sender {
[_player adjustVolume:sender.value forPlayerAtIndex:1];
}

- (IBAction)playButtonDidClick:(id)sender {

[_player play];
}

- (IBAction)stopButtonDidClick:(id)sender {
[_player stop];
}

- (IBAction)changeRate:(UISlider *)sender {
[_player adjustRate:sender.value];
}

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

@end

　　

StoryBoard



在Info.Plist中添加



这样一个简单的播放器就实现了，同时能处理一些中断的事件