一个简单的播放器实现

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最近有个简单播放器的需求需要实现，公司其他项目本身已有播放器实现但是业务逻辑不满足现有需求，所以参照原有模块并结合相关资料自己实现了一个简单播放器，该播放器是基于AVPlayer实现的。

播放器功能介绍

  • 单例实现
  • 播放、暂停、切歌、缓冲处理、播放进度实时更新
  • 后台持续播放
  • 音频中断处理

协议代理

播放器功能协议TTPlayerProtocol
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@protocol TTPlayerProtocol <NSObject>

- (void) playMusicWithInfo:(id<TTMusicModelProtocol>)model;

- (void) enterPlayQueueWithSingle:(id<TTMusicModelProtocol>)model;
- (void) enterPlayQueueWithArray:(NSArray<id<TTMusicModelProtocol>> *)models;

- (void) replaceAllQueueWithSingle:(id<TTMusicModelProtocol>)model;
- (void) replaceAllQueueWithArray:(NSArray<id<TTMusicModelProtocol>> *)models;

- (BOOL) isPlaying;

- (BOOL) isNextExist;

- (BOOL) isPreExist;

- (void) next;

- (void) pre;

- (void) pause;

- (void) stop;

- (void) play;

- (void) continuePlay;

- (double) currentSecs;

- (double) durationSecs;

@end
播放器状态代理TTAudioPlayerStatusDelegate
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@protocol TTAudioPlayerStatusDelegate <NSObject>

@optional
- (void)ttAudioPlayerPlayStart;
- (void)ttAudioPlayerPlayFinished;
- (void)ttAudioPlayerPause;
- (void)ttAudioPlayerStoped;
- (void)ttAudioPlayerPlayError:(NSError *)error;
- (void)ttAudioPlayerSeekPosition:(double)progress;
- (void)ttAudioPlayerUpdateProgress:(double)progress;
- (void)ttAduioPlayerMusicInfoUpdate:(id<TTMusicModelProtocol>)musicInfo;

@end
数据模型协议 TTMusicModelProtocol
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@protocol TTMusicModelProtocol <NSObject>

@required
@property (nonatomic, copy) NSString *url;

@optional
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *cover;
@property (nonatomic, copy) NSString *author;
@property (nonatomic, copy) NSString *album;

@end

类介绍

TTAudioPlayer

播放器对象，实现了TTPlayerProtocol协议

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@interface TTAudioPlayer : NSObject<TTPlayerProtocol>

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

+ (instancetype)shareInstance;

@end

TTMusicModel

音乐数据模型，遵守TTMusicModelProtocol协议，可扩展

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@interface TTMusicModel : NSObject<TTMusicModelProtocol>

@end

问题与功能实现细节

设置播放器在后台，锁屏，静音模式下都可以播放
1.在后台模式中打开音频播放模式

Targets–>Capabilities–>BackgroundModes–>ON

勾选 Audio,Airplay,and Picture in Picture

2.设置音频类别

这段代码我写在播放器初始化的时候

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[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive:YES error:nil];

3.开启后台任务

前面两步做完之后，app进入后台音频是可以继续播放，但是播完一首之后，后面的就不会播放了，这里开启后台任务就好了

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@interface AppDelegate ()
{
    UIBackgroundTaskIdentifier bgTask;
}
@end

进入后台后开启任务

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- (void)applicationDidEnterBackground:(UIApplication *)application {

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
    [application endBackgroundTask:self->bgTask];
    self->bgTask = UIBackgroundTaskInvalid;
    }];

}

进入前台，结束后台任务

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- (void)applicationWillEnterForeground:(UIApplication *)application {
    if (bgTask != UIBackgroundTaskInvalid) {
    [application endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
    }
}

处理中断事件

监听中断通知

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

中断处理

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- (void)handleInterreptionNotification:(NSNotification *)notification {
    if ([notification.userInfo count] == 0) {
        return;
    }
    if (AVAudioSessionInterruptionTypeBegan == [notification.userInfo[AVAudioSessionInterruptionTypeKey] intValue]) {
        NSLog(@"中断，暂停音乐");
        [self pause];
    }
    else if (AVAudioSessionInterruptionTypeEnded == [notification.userInfo[AVAudioSessionInterruptionTypeKey] intValue]) {
        NSError *error,*activeError;
        [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:0 error:&error];
        [[AVAudioSession sharedInstance] setActive:YES error:&activeError];
        
        if (error) {
            NSLog(@"中断结束，设置类别失败:%@",error);
        } else if (activeError) {
            NSLog(@"中断结束，获取音频焦点失败:%@",activeError);
        } else {
            NSLog(@"中断结束，恢复音乐播放");
            [self continuePlay];
        }
    }
}

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