使用AVPlayer播放本地，或网络音频文件

朱雀 2022-05-17 04:57 221阅读 0赞

[SYAudio][]

导入录音头文件（注意添加framework：`AVFoundation.framework`、`AudioToolbox.framework`）

#import <AVFoundation/AVFoundation.h>
    #import <AVKit/AVKit.h>

@property (nonatomic, strong) AVPlayer *player;
    @property (nonatomic, strong) id timeObserver;
    
    @property (nonatomic, assign) BOOL hasObserver;

开始播放

- (void)playerStart:(NSString *)filePath
    {
        if (!filePath || filePath.length <= 0) {
            NSLog(@"无效的文件");
            return;
        }
    
        // 移除监听器
        [self removeObserver];
    
        // 设置播放的url
        NSURL *url = [NSURL fileURLWithPath:filePath];
        if ([filePath hasPrefix:@"http://"] || [filePath hasPrefix:@"https://"]) {
            url = [NSURL URLWithString:filePath];
        }
        // 设置播放的项目
        AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:url];
        if (self.player == nil) {
           self.player = [[AVPlayer alloc] init];
        }
        [self.player replaceCurrentItemWithPlayerItem:playerItem];
        [self.player play];
    
        // 添加监听器
        [self addObserver];
    }

暂停播放

- (void)playerPause {
        [self.player pause];
    }

添加监听

- (void)addObserver
    {
        if (!self.hasObserver) {
            self.hasObserver = YES;
    
            // KVO
            // KVO来观察status属性的变化
            [self.player.currentItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
            // KVO监测加载情况
            [self.player.currentItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
    
            //
            SYAudioPlay __weak *weakSelf = self;
            self.timeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
                if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(audioPlaying:time:)]) {
                    [weakSelf.delegate audioPlaying:CMTimeGetSeconds(weakSelf.player.currentItem.duration) time:CMTimeGetSeconds(time)];
                }
            }];
    
            // 通知
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playFinish) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
        }
    }

移除监听

- (void)removeObserver
    {
        if (self.hasObserver) {
            self.hasObserver = NO;
    
            [self.player.currentItem removeObserver:self forKeyPath:@"status"];
            [self.player.currentItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
    
            [self.player removeTimeObserver:self.timeObserver];
            self.timeObserver = nil;
    
            [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
        }
    }

实现监听

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
    {
        if ([keyPath isEqualToString:@"status"]) {
            // 取出status的新值
            AVPlayerItemStatus status = [change[NSKeyValueChangeNewKey] intValue];
            switch (status) {
                case AVPlayerItemStatusFailed: {
                    NSLog(@"item 有误");                
                } break;
                case AVPlayerItemStatusReadyToPlay: {
                    NSLog(@"准好播放了");
                    [self.player play];
                } break;
                case AVPlayerItemStatusUnknown: {
                    NSLog(@"视频资源出现未知错误");
                } break;
                default: break;
            }
        } else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
            NSArray *array = self.player.currentItem.loadedTimeRanges;
            // 本次缓冲的时间范围
            CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];
            // 缓冲总长度
            NSTimeInterval totalBuffer = CMTimeGetSeconds(timeRange.start) + CMTimeGetSeconds(timeRange.duration);
            // 音乐的总时间
            NSTimeInterval duration = CMTimeGetSeconds(self.player.currentItem.duration);
            // 计算缓冲百分比例
            NSTimeInterval scale = totalBuffer / duration;
            //
            NSLog(@"总时长：%f, 已缓冲：%f, 总进度：%f", duration, totalBuffer, scale);
        }
    }

播放完成

- (void)playFinish { NSLog(@"播放完成"); }

[SYAudio]: https://github.com/potato512/SYAudio