// // LFVideoPlayer.m // VideoPlayDemo // // Created by LamTsanFeng on 2016/11/17. // Copyright © 2016年 GZMiracle. All rights reserved. // #import "LFVideoPlayer.h" enum { kCMPersistentTrackID_Orignail_Video_Invalid = 100, kCMPersistentTrackID_Orignail_Audio_Invalid = 200 }; @interface LFVideoPlayer () /** 视频播放对象 */ @property (strong) AVPlayerItem* mPlayerItem; /** 视频播放器 */ @property (strong) AVPlayer* player; @property (nonatomic, copy) AVAudioTimePitchAlgorithm audioTimePitchAlgorithm; @property (nonatomic, copy) AVMutableComposition *composition; @property (nonatomic ,strong) AVMutableAudioMix *audioMix; @end static void *LFPlayerRateObservationContext = &LFPlayerRateObservationContext; static void *LFPlayerStatusObservationContext = &LFPlayerStatusObservationContext; static void *LFPlayerCurrentItemObservationContext = &LFPlayerCurrentItemObservationContext; @implementation LFVideoPlayer - (instancetype)init { self = [super init]; if (self) { _size = CGSizeZero; _rate = 1.f; _audioTimePitchAlgorithm = AVAudioTimePitchAlgorithmTimeDomain; } return self; } - (void)dealloc { [self removePlayerTimeObserver]; [self.player removeObserver:self forKeyPath:@"rate"]; [self.player removeObserver:self forKeyPath:@"currentItem"]; [self.player.currentItem removeObserver:self forKeyPath:@"status"]; [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:self.mPlayerItem]; [self.player pause]; } #pragma mark Asset URL - (void)setURL:(NSURL*)URL { if (mURL != URL) { mURL = [URL copy]; /* Create an asset for inspection of a resource referenced by a given URL. Load the values for the asset key "playable". */ self.asset = [AVURLAsset URLAssetWithURL:mURL options:nil]; } } - (NSURL*)URL { return mURL; } - (void)setAsset:(AVAsset *)asset { _muteOriginalSound = NO; _audioMix = nil; _audioUrls = nil; _rate = 1.f; self.composition = [self createAVMutableComposition:asset]; } - (AVAsset *)asset { return self.composition; } - (void)setComposition:(AVMutableComposition *)composition { _composition = composition; /** size */ CGSize videoSize = CGSizeZero; NSArray *assetVideoTracks = [composition tracksWithMediaType:AVMediaTypeVideo]; if (assetVideoTracks.count > 0) { // Insert the tracks in the composition's tracks AVAssetTrack *track = [assetVideoTracks firstObject]; CGSize dimensions = CGSizeApplyAffineTransform(track.naturalSize, track.preferredTransform); videoSize = CGSizeMake(fabs(dimensions.width), fabs(dimensions.height)); } else { NSLog(@"Error reading the transformed video track"); } _size = videoSize; NSArray *requestedKeys = @[@"playable"]; /* Tells the asset to load the values of any of the specified keys that are not already loaded. */ [composition loadValuesAsynchronouslyForKeys:requestedKeys completionHandler: ^{ dispatch_async( dispatch_get_main_queue(), ^{ /* IMPORTANT: Must dispatch to main queue in order to operate on the AVPlayer and AVPlayerItem. */ [self prepareToPlayAsset:composition withKeys:requestedKeys]; }); }]; } #pragma mark - create AVMutableComposition - (AVMutableComposition *)createAVMutableComposition:(AVAsset *)asset { AVAssetTrack *assetVideoTrack = nil; AVAssetTrack *assetAudioTrack = nil; // Check if the asset contains video and audio tracks if ([[asset tracksWithMediaType:AVMediaTypeVideo] count] != 0) { assetVideoTrack = [asset tracksWithMediaType:AVMediaTypeVideo][0]; } if ([[asset tracksWithMediaType:AVMediaTypeAudio] count] != 0) { assetAudioTrack = [asset tracksWithMediaType:AVMediaTypeAudio][0]; } CMTime insertionPoint = kCMTimeZero; // Step 1 // Create a composition with the given asset and insert audio and video tracks into it from the asset // Check if a composition already exists, else create a composition using the input asset AVMutableComposition *composition = [[AVMutableComposition alloc] init]; // Insert the video and audio tracks from AVAsset if (assetVideoTrack != nil) { // 视频通道 工程文件中的轨道，有音频轨、视频轨等，里面可以插入各种对应的素材 AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Orignail_Video_Invalid]; // 视频方向 [compositionVideoTrack setPreferredTransform:assetVideoTrack.preferredTransform]; // 把视频轨道数据加入到可变轨道中 这部分可以做视频裁剪TimeRange [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration) ofTrack:assetVideoTrack atTime:insertionPoint error:nil]; } if (assetAudioTrack != nil) { AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Orignail_Audio_Invalid]; [compositionAudioTrack setPreferredTransform:assetAudioTrack.preferredTransform]; [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration) ofTrack:assetAudioTrack atTime:insertionPoint error:nil]; /** 创建原音混音 */ self.audioMix = [AVMutableAudioMix audioMix]; AVMutableAudioMixInputParameters *audioInputParams = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:compositionAudioTrack]; audioInputParams.audioTimePitchAlgorithm = self.audioTimePitchAlgorithm; [audioInputParams setVolume:1.f atTime:kCMTimeZero]; self.audioMix.inputParameters = @[audioInputParams]; } return composition; } #pragma mark Asset audioMix - (void)setAudioUrls:(NSArray *)audioUrls { _audioUrls = audioUrls; /** 判断是否有执行过步骤 */ BOOL hasExecute = NO; CMTime insertionPoint = kCMTimeZero; /** 删除原音以外的音轨 */ NSArray *audioTracks = [self.composition tracksWithMediaType:AVMediaTypeAudio]; for (AVAssetTrack *track in audioTracks) { if ([track trackID] == kCMPersistentTrackID_Orignail_Audio_Invalid) { continue; } if ([track isKindOfClass:[AVCompositionTrack class]]) { [self.composition removeTrack:(AVCompositionTrack *)track]; hasExecute = YES; } } /** 获取原混音列表 */ NSMutableArray *inputParameters = [self.audioMix.inputParameters mutableCopy]; if (inputParameters == nil) { inputParameters = [@[] mutableCopy]; } /** 重建音频混音 */ for (AVAudioMixInputParameters *audioInputParams in self.audioMix.inputParameters) { if ([audioInputParams trackID] == kCMPersistentTrackID_Orignail_Audio_Invalid) { continue; } [inputParameters removeObject:audioInputParams]; } CMTime duration = self.composition.duration; for (NSURL *audioUrl in audioUrls) { /** 声音采集 */ AVURLAsset *audioAsset =[[AVURLAsset alloc]initWithURL:audioUrl options:nil]; AVAssetTrack *additional_assetAudioTrack = nil; /** 检查是否有效音轨 */ if ([[audioAsset tracksWithMediaType:AVMediaTypeAudio] count] != 0) { additional_assetAudioTrack = [audioAsset tracksWithMediaType:AVMediaTypeAudio][0]; } if (additional_assetAudioTrack) { AVMutableCompositionTrack *additional_compositionAudioTrack = [self.composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; [additional_compositionAudioTrack setPreferredTransform:additional_assetAudioTrack.preferredTransform]; [additional_compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, duration) ofTrack:additional_assetAudioTrack atTime:insertionPoint error:nil]; AVMutableAudioMixInputParameters *mixParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:additional_compositionAudioTrack]; mixParameters.audioTimePitchAlgorithm = self.audioTimePitchAlgorithm; [mixParameters setVolumeRampFromStartVolume:1.f toEndVolume:0.3 timeRange:CMTimeRangeMake(kCMTimeZero, duration)]; [inputParameters addObject:mixParameters]; } } if (inputParameters.count && audioUrls.count) { hasExecute = YES; [self.audioMix setInputParameters:inputParameters]; } if (hasExecute) { self.composition = self.composition; } } - (void)setMuteOriginalSound:(BOOL)muteOriginalSound { if (_muteOriginalSound != muteOriginalSound) { _muteOriginalSound = muteOriginalSound; /** 更新原音混音 */ NSArray *audioTracks = [self.composition tracksWithMediaType:AVMediaTypeAudio]; NSMutableArray *inputParameters = [self.audioMix.inputParameters mutableCopy]; for (AVAudioMixInputParameters *audioInputParams in self.audioMix.inputParameters) { if ([audioInputParams trackID] == kCMPersistentTrackID_Orignail_Audio_Invalid) { [inputParameters removeObject:audioInputParams]; break; } } for (AVAssetTrack *track in audioTracks) { AVMutableAudioMixInputParameters *audioInputParams = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track]; audioInputParams.audioTimePitchAlgorithm = self.audioTimePitchAlgorithm; if ([track trackID] == kCMPersistentTrackID_Orignail_Audio_Invalid) { [audioInputParams setVolume:(muteOriginalSound ? 0 : 1) atTime:kCMTimeZero]; [inputParameters insertObject:audioInputParams atIndex:0]; break; } } [self.audioMix setInputParameters:inputParameters]; [self.mPlayerItem setAudioMix:self.audioMix]; } } - (void)setRate:(float)rate { if (rate >= 0.5f && rate <= 2.0) { if (_rate != rate) { _rate = rate; self.player.rate = rate; } } } #pragma mark #pragma mark Button Action Methods - (void)play { /* If we are at the end of the movie, we must seek to the beginning first before starting playback. */ if (YES == seekToZeroBeforePlay) { seekToZeroBeforePlay = NO; [self.player seekToTime:kCMTimeZero toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero]; } [self.player play]; self.player.rate = self.rate; } - (void)pause { [self.player pause]; } /** 静音 */ - (void)mute:(BOOL)mute { self.player.muted = mute; } - (void)resetDisplay { seekToZeroBeforePlay = NO; [self.player seekToTime:kCMTimeZero toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero]; } /** 跳转到某帧 */ - (void)seekToTime:(CGFloat)time { [self.player seekToTime:CMTimeMakeWithSeconds(time, self.mPlayerItem.asset.duration.timescale) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero]; } #pragma mark - #pragma mark Movie scrubber control /* --------------------------------------------------------- ** Methods to handle manipulation of the movie scrubber control ** ------------------------------------------------------- */ /* Requests invocation of a given block during media playback to update the movie scrubber control. */ -(void)initScrubberTimer { [self removePlayerTimeObserver]; double interval = .1f; CMTime playerDuration = [self playerItemDuration]; if (CMTIME_IS_INVALID(playerDuration)) { return; } double duration = CMTimeGetSeconds(playerDuration); if (isfinite(duration)) { CGFloat progressWidth = [UIScreen mainScreen].bounds.size.width; if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:)]) { UISlider *slider = [self.delegate LFVideoPlayerSyncScrub:self]; if ([slider isKindOfClass:[UISlider class]]) { progressWidth = CGRectGetWidth(slider.frame); } } else if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrubProgressWidth:)]) { progressWidth = [self.delegate LFVideoPlayerSyncScrubProgressWidth:self]; } CGFloat width = progressWidth; interval = 0.5f * duration / width; } /* Update the scrubber during normal playback. */ __weak typeof(self) weakSelf = self; mTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(interval, NSEC_PER_SEC) queue:NULL /* If you pass NULL, the main queue is used. */ usingBlock:^(CMTime time) { [weakSelf syncScrubber]; }]; } /* Set the scrubber based on the player current time. */ - (void)syncScrubber { CMTime playerDuration = [self playerItemDuration]; if (CMTIME_IS_INVALID(playerDuration)) { if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:)]) { UISlider *slider = [self.delegate LFVideoPlayerSyncScrub:self]; if ([slider isKindOfClass:[UISlider class]]) { slider.value = 0.0; } } else if (self.player.status == AVPlayerStatusReadyToPlay && [self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:duration:)]) { [self.delegate LFVideoPlayerSyncScrub:self duration:0.0]; } return; } double totalDuration = CMTimeGetSeconds(playerDuration); if (isfinite(totalDuration)) { _duration = CMTimeGetSeconds([self.player currentTime]); if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:)]) { UISlider *slider = [self.delegate LFVideoPlayerSyncScrub:self]; if ([slider isKindOfClass:[UISlider class]]) { float minValue = slider.minimumValue; float maxValue = slider.maximumValue; float value = (maxValue - minValue) * _duration / totalDuration + minValue; slider.value = value; } } else if (self.player.status == AVPlayerStatusReadyToPlay &&[self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:duration:)]) { [self.delegate LFVideoPlayerSyncScrub:self duration:_duration]; } } } /* The user is dragging the movie controller thumb to scrub through the movie. */ - (void)beginScrubbing { mRestoreAfterScrubbingRate = [self.player rate]; [self.player setRate:0.f]; /* Remove previous timer. */ [self removePlayerTimeObserver]; } /* Set the player current time to match the scrubber position. */ - (void)scrub:(UISlider *)slider { if ([slider isKindOfClass:[UISlider class]] && !isSeeking) { isSeeking = YES; CMTime playerDuration = [self playerItemDuration]; if (CMTIME_IS_INVALID(playerDuration)) { return; } double duration = CMTimeGetSeconds(playerDuration); if (isfinite(duration)) { float minValue = slider.minimumValue; float maxValue = slider.maximumValue; float value = slider.value; double time = duration * (value - minValue) / (maxValue - minValue); NSLog(@"%f", time); __weak typeof(self) weakSelf = self; [self.player seekToTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC) completionHandler:^(BOOL finished) { dispatch_async(dispatch_get_main_queue(), ^{ __strong typeof(self) strongSelf = weakSelf; strongSelf->isSeeking = NO; }); }]; } } } /* The user has released the movie thumb control to stop scrubbing through the movie. */ - (void)endScrubbing { if (!mTimeObserver) { CMTime playerDuration = [self playerItemDuration]; if (CMTIME_IS_INVALID(playerDuration)) { return; } double duration = CMTimeGetSeconds(playerDuration); if (isfinite(duration)) { CGFloat progressWidth = [UIScreen mainScreen].bounds.size.width; if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrub:)]) { UISlider *slider = [self.delegate LFVideoPlayerSyncScrub:self]; if ([slider isKindOfClass:[UISlider class]]) { progressWidth = CGRectGetWidth(slider.frame); } } else if ([self.delegate respondsToSelector:@selector(LFVideoPlayerSyncScrubProgressWidth:)]) { progressWidth = [self.delegate LFVideoPlayerSyncScrubProgressWidth:self]; } CGFloat width = progressWidth; double tolerance = 0.5f * duration / width; __weak typeof(self) weakSelf = self; mTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(tolerance, NSEC_PER_SEC) queue:NULL usingBlock: ^(CMTime time) { [weakSelf syncScrubber]; }]; } } if (mRestoreAfterScrubbingRate) { [self.player setRate:mRestoreAfterScrubbingRate]; mRestoreAfterScrubbingRate = 0.f; } } - (BOOL)isScrubbing { return mRestoreAfterScrubbingRate != 0.f; } #pragma mark Player Item - (BOOL)isPlaying { return mRestoreAfterScrubbingRate != 0.f || [self.player rate] != 0.f; } /* Called when the player item has played to its end time. */ - (void)playerItemDidReachEnd:(NSNotification *)notification { /* After the movie has played to its end time, seek back to time zero to play it again. */ seekToZeroBeforePlay = YES; if ([self.delegate respondsToSelector:@selector(LFVideoPlayerPlayDidReachEnd:)]) { [self.delegate LFVideoPlayerPlayDidReachEnd:self]; } } /* --------------------------------------------------------- ** Get the duration for a AVPlayerItem. ** ------------------------------------------------------- */ - (CMTime)playerItemDuration { AVPlayerItem *playerItem = [self.player currentItem]; if (playerItem.status == AVPlayerItemStatusReadyToPlay) { return([playerItem duration]); } return(kCMTimeInvalid); } /* Cancels the previously registered time observer. */ -(void)removePlayerTimeObserver { if (mTimeObserver) { [self.player removeTimeObserver:mTimeObserver]; mTimeObserver = nil; } } #pragma mark - #pragma mark Loading the Asset Keys Asynchronously #pragma mark - #pragma mark Error Handling - Preparing Assets for Playback Failed /* -------------------------------------------------------------- ** Called when an asset fails to prepare for playback for any of ** the following reasons: ** ** 1) values of asset keys did not load successfully, ** 2) the asset keys did load successfully, but the asset is not ** playable ** 3) the item did not become ready to play. ** ----------------------------------------------------------- */ -(void)assetFailedToPrepareForPlayback:(NSError *)error { [self removePlayerTimeObserver]; [self syncScrubber]; if ([self.delegate respondsToSelector:@selector(LFVideoPlayerFailedToPrepare:error:)]) { [self.delegate LFVideoPlayerFailedToPrepare:self error:error]; } /* Display the error. */ // UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[error localizedDescription] // message:[error localizedFailureReason] // delegate:nil // cancelButtonTitle:@"OK" // otherButtonTitles:nil]; // [alertView show]; } #pragma mark Prepare to play asset, URL /* Invoked at the completion of the loading of the values for all keys on the asset that we require. Checks whether loading was successfull and whether the asset is playable. If so, sets up an AVPlayerItem and an AVPlayer to play the asset. */ - (void)prepareToPlayAsset:(AVAsset *)asset withKeys:(NSArray *)requestedKeys { /* Make sure that the value of each key has loaded successfully. */ for (NSString *thisKey in requestedKeys) { NSError *error = nil; AVKeyValueStatus keyStatus = [asset statusOfValueForKey:thisKey error:&error]; if (keyStatus == AVKeyValueStatusFailed) { [self assetFailedToPrepareForPlayback:error]; return; } /* If you are also implementing -[AVAsset cancelLoading], add your code here to bail out properly in the case of cancellation. */ } /* Use the AVAsset playable property to detect whether the asset can be played. */ if (!asset.playable) { /* Generate an error describing the failure. */ NSString *localizedDescription = NSLocalizedString(@"Item cannot be played", @"Item cannot be played description"); NSString *localizedFailureReason = NSLocalizedString(@"The assets tracks were loaded, but could not be made playable.", @"Item cannot be played failure reason"); NSDictionary *errorDict = [NSDictionary dictionaryWithObjectsAndKeys: localizedDescription, NSLocalizedDescriptionKey, localizedFailureReason, NSLocalizedFailureReasonErrorKey, nil]; NSError *assetCannotBePlayedError = [NSError errorWithDomain:@"StitchedStreamPlayer" code:0 userInfo:errorDict]; /* Display the error to the user. */ [self assetFailedToPrepareForPlayback:assetCannotBePlayedError]; return; } /* At this point we're ready to set up for playback of the asset. */ /* Stop observing our prior AVPlayerItem, if we have one. */ if (self.mPlayerItem) { /* Remove existing player item key value observers and notifications. */ [self.mPlayerItem removeObserver:self forKeyPath:@"status"]; [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:self.mPlayerItem]; } /* Create a new instance of AVPlayerItem from the now successfully loaded AVAsset. */ self.mPlayerItem = [AVPlayerItem playerItemWithAsset:asset]; self.mPlayerItem.audioMix = self.audioMix; self.mPlayerItem.audioTimePitchAlgorithm = self.audioTimePitchAlgorithm; /* Observe the player item "status" key to determine when it is ready to play. */ [self.mPlayerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew context:LFPlayerStatusObservationContext]; /* When the player item has played to its end time we'll toggle the movie controller Pause button to be the Play button */ [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerItemDidReachEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.mPlayerItem]; seekToZeroBeforePlay = NO; /* Create new player, if we don't already have one. */ if (!self.player) { /* Get a new AVPlayer initialized to play the specified player item. */ self.player = [AVPlayer playerWithPlayerItem:self.mPlayerItem]; /* Observe the AVPlayer "currentItem" property to find out when any AVPlayer replaceCurrentItemWithPlayerItem: replacement will/did occur.*/ [self.player addObserver:self forKeyPath:@"currentItem" options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew context:LFPlayerCurrentItemObservationContext]; /* Observe the AVPlayer "rate" property to update the scrubber control. */ [self.player addObserver:self forKeyPath:@"rate" options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew context:LFPlayerRateObservationContext]; } /* Make our new AVPlayerItem the AVPlayer's current item. */ if (self.player.currentItem != self.mPlayerItem) { /* Replace the player item with a new player item. The item replacement occurs asynchronously; observe the currentItem property to find out when the replacement will/did occur If needed, configure player item here (example: adding outputs, setting text style rules, selecting media options) before associating it with a player */ [self.player replaceCurrentItemWithPlayerItem:self.mPlayerItem]; } } #pragma mark - #pragma mark Asset Key Value Observing #pragma mark #pragma mark Key Value Observer for player rate, currentItem, player item status /* --------------------------------------------------------- ** Called when the value at the specified key path relative ** to the given object has changed. ** Adjust the movie play and pause button controls when the ** player item "status" value changes. Update the movie ** scrubber control when the player item is ready to play. ** Adjust the movie scrubber control when the player item ** "rate" value changes. For updates of the player ** "currentItem" property, set the AVPlayer for which the ** player layer displays visual output. ** NOTE: this method is invoked on the main queue. ** ------------------------------------------------------- */ - (void)observeValueForKeyPath:(NSString*) path ofObject:(id)object change:(NSDictionary*)change context:(void*)context { /* AVPlayerItem "status" property value observer. */ if (context == LFPlayerStatusObservationContext) { AVPlayerItemStatus status = [[change objectForKey:NSKeyValueChangeNewKey] integerValue]; switch (status) { /* Indicates that the status of the player is not yet known because it has not tried to load new media resources for playback */ case AVPlayerItemStatusUnknown: { [self removePlayerTimeObserver]; [self syncScrubber]; } break; case AVPlayerItemStatusReadyToPlay: { /* Once the AVPlayerItem becomes ready to play, i.e. [playerItem status] == AVPlayerItemStatusReadyToPlay, its duration can be fetched from the item. */ [self initScrubberTimer]; if ([self.delegate respondsToSelector:@selector(LFVideoPlayerReadyToPlay:duration:)]) { double duration = 0.0; CMTime playerDuration = [self playerItemDuration]; if (!CMTIME_IS_INVALID(playerDuration)) { duration = CMTimeGetSeconds(playerDuration); } _totalDuration = duration; [self.delegate LFVideoPlayerReadyToPlay:self duration:duration]; } } break; case AVPlayerItemStatusFailed: { AVPlayerItem *playerItem = (AVPlayerItem *)object; [self assetFailedToPrepareForPlayback:playerItem.error]; } break; } } /* AVPlayer "rate" property value observer. */ else if (context == LFPlayerRateObservationContext) { //The only supported values are 0.50, 0.67, 0.80, 1.0, 1.25, 1.50, and 2.0. All other settings are rounded to nearest value. see AVAudioProcessingSettings.h } /* AVPlayer "currentItem" property observer. Called when the AVPlayer replaceCurrentItemWithPlayerItem: replacement will/did occur. */ else if (context == LFPlayerCurrentItemObservationContext) { AVPlayerItem *newPlayerItem = [change objectForKey:NSKeyValueChangeNewKey]; /* Is the new player item null? */ if (newPlayerItem == (id)[NSNull null]) { } else /* Replacement of player currentItem has occurred */ { /* Set the AVPlayer for which the player layer displays visual output. */ /* Specifies that the player should preserve the video’s aspect ratio and fit the video within the layer’s bounds. */ /** AVLayerVideoGravityResizeAspect */ if ([self.delegate respondsToSelector:@selector(LFVideoPlayerLayerDisplay:avplayer:)]) { [self.delegate LFVideoPlayerLayerDisplay:self avplayer:self.player]; } } } else { [super observeValueForKeyPath:path ofObject:object change:change context:context]; } } @end