前言

• 公司APP使用七牛的播放器，各种崩溃，各种卡顿问题，一怒之下抽时间，看看有没苹果自带框架比较好解决播放问题，又不想引入其他库增加APP大小。发现AVPlayer，确实效率不错，基本满足业务需求，和同事确认了APP某部分功能播放文件只使用了mp4，m3u8，flv （按使用量先后排序）。AVPlayer不支持flv,所以mp4,m3u8使用AVPlayer，其他使用七牛播放器SDK.

注意

• 由于项目使用较多约束，但是AVPlayer默认渲染不能根据约束大小变化，所以需要重载UIView的一个方法，强制改变layerClass，作为AVPlayer的渲染层，以便动态适配约束。

.h 文件#import <UIKit/UIKit.h>
@interface TTVAVPlayerView : UIView
@end.m 文件#import "TTVAVPlayerView.h"
#import <AVFoundation/AVFoundation.h>@implementation TTVAVPlayerView+ (Class)layerClass {return [AVPlayerLayer class];
}@end

AVPlayer

使用库

#import <AVFoundation/AVFoundation.h>
#import<MediaPlayer/MediaPlayer.h>
#import<CoreMedia/CoreMedia.h>

初始化

- (NSDictionary*)setupPlayer:(NSString*)url{//防盗链headersNSMutableDictionary * headers = [NSMutableDictionary dictionary];[headers setObject:@"http://*.itouchtv.cn" forKey:@"Referer"];NSURL*liveURL = [NSURL URLWithString:url];AVAsset*liveAsset = [AVURLAsset URLAssetWithURL:liveURL options:@{@"AVURLAssetHTTPHeaderFieldsKey" : headers} ];AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:liveAsset];if (iOS9_OR_LATER) {playerItem.canUseNetworkResourcesForLiveStreamingWhilePaused = true;}if (iOS10_OR_LATER) {playerItem.preferredForwardBufferDuration = kPreferredForwardBufferDuration;}//播放器AVPlayer*player = [AVPlayer playerWithPlayerItem:playerItem];//渲染对象TTVAVPlayerView* avPlayerView = [[TTVAVPlayerView alloc ]init];AVPlayerLayer* playerLayer = (AVPlayerLayer *)avPlayerView.layer;[playerLayer setPlayer:player];return @{@"AVAsset":player,@"TTVAVPlayerView":avPlayerView};
}

状态监听

• 方法一 KVO监听

static NSString* const kStatusKeyName = @"status";
static NSString* const kLoadedTimeRangesKeyName = @"loadedTimeRanges";
static NSString* const kPlaybackBufferEmptyKeyName = @"playbackBufferEmpty";
static NSString* const kPlaybackLikelyToKeepUpKeyName = @"playbackLikelyToKeepUp";- (void)addKVO:(AVPlayerItem*)playerItem{if (playerItem == nil) return;[playerItem addObserver:self forKeyPath:kStatusKeyName options:NSKeyValueObservingOptionNew context:nil];[playerItem addObserver:self forKeyPath:kLoadedTimeRangesKeyName options:NSKeyValueObservingOptionNew context:nil];[playerItem addObserver:self forKeyPath:kPlaybackBufferEmptyKeyName options:NSKeyValueObservingOptionNew context:nil];[playerItem addObserver:self forKeyPath:kPlaybackLikelyToKeepUpKeyName options:NSKeyValueObservingOptionNew context:nil];
}- (void)delKVO:(AVPlayerItem*)playerItem{@try {[playerItem removeObserver:self forKeyPath:kStatusKeyName context:nil];[playerItem removeObserver:self forKeyPath:kLoadedTimeRangesKeyName context:nil];[playerItem removeObserver:self forKeyPath:kPlaybackBufferEmptyKeyName context:nil];[playerItem removeObserver:self forKeyPath:kPlaybackLikelyToKeepUpKeyName context:nil];}@catch (NSException *exception) {DLog(@"多次删除了");}
}//监听获得消息
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{{AVPlayerItem *playerItem = (AVPlayerItem *)object;if ([keyPath isEqualToString:@"status"]) {if ([playerItem status] == AVPlayerStatusReadyToPlay) {self.playerStatus = TTVPlayerStatusReady;//status 点进去看 有三种状态CGFloat duration = playerItem.duration.value / playerItem.duration.timescale; //视频总时间DLog(@"准备好播放了，总时间：%.2f", duration);//还可以获得播放的进度，这里可以给播放进度条赋值了} else if ([playerItem status] == AVPlayerStatusFailed || [playerItem status] == AVPlayerStatusUnknown) {[_player pause];}} else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {  //监听播放器的下载进度NSArray *loadedTimeRanges = [playerItem loadedTimeRanges];CMTimeRange timeRange = [loadedTimeRanges.firstObject CMTimeRangeValue];// 获取缓冲区域float startSeconds = CMTimeGetSeconds(timeRange.start);float durationSeconds = CMTimeGetSeconds(timeRange.duration);NSTimeInterval timeInterval = startSeconds + durationSeconds;// 计算缓冲总进度CMTime duration = playerItem.duration;CGFloat totalDuration = CMTimeGetSeconds(duration);CGFloat bufferdDuration = round(timeInterval);DLog(@"下载进度：%.2f 当前下载时长:%.2f 总时长:%.2f", timeInterval / totalDuration,self.bufferedTime,totalDuration);} else if ([keyPath isEqualToString:@"playbackBufferEmpty"]) { //监听播放器在缓冲数据的状态DLog(@"缓冲不足暂停了");} else if ([keyPath isEqualToString:@"playbackLikelyToKeepUp"]) {DLog(@"缓冲达到可播放程度了");//由于 AVPlayer 缓存不足就会自动暂停，所以缓存充足了需要手动播放，才能继续播放[_player play];}}
}

• 方法二 通知监听

- (void)addNotification{[[NSNotificationCenter defaultCenter] removeObserver:self];[[NSNotificationCenter defaultCenter] removeObserver:self.player];@weakify(self)[[NSNotificationCenter defaultCenter]addObserverForName:AVPlayerItemDidPlayToEndTimeNotificationobject:nil queue:[NSOperationQueue mainQueue]usingBlock:^(NSNotification * _Nonnull note) {@strongify(self)DLog(@"播放完成");}];[[NSNotificationCenter defaultCenter]addObserverForName:AVPlayerItemFailedToPlayToEndTimeNotificationobject:nil queue:[NSOperationQueue mainQueue]usingBlock:^(NSNotification * _Nonnull note) {@strongify(self)DLog(@"播放出错");}];
}

• 一些状态的判断

@property (nonatomic, strong) AVPlayer *player;- (BOOL)playing {if (self.playerItem.isPlaybackLikelyToKeepUp &&  self.player.rate == 1) {return true;}return false;
}- (NSUInteger)currentPlayingTime {CMTime time = self.player.currentTime;return CMTimeGetSeconds(time);
}- (NSUInteger)totalPlayingTime {CMTime time = self.player.currentItem.duration;Float64 seconds = CMTimeGetSeconds(time);return seconds;
}- (void)seekTo:(NSUInteger)sec{CMTime time = CMTimeMakeWithSeconds(sec, 1);[self.player seekToTime:time];
}- (void)play{[self.player play];
}- (void)resume{[self seekTo:self.currentPlayingTime];[self.player play];
}- (void)pause{[self.player pause];
}- (void)stop{[self.player pause];self.player.muted = true;self.player.rate = 0.0;
}

原文：http://raychow.linkfun.top/2017/12/28/archives/1_ios/AVPlayer/index/