AVSimpleEditor/AVSEAddWatermarkCommand.m
/* |
File: AVSEAddWatermarkCommand.m |
Abstract: A subclass of AVSECommand which handles CALayer. This tool adds a title layer (CALayer) on top of an existing AVMutableComposition or an AVAsset. |
Version: 1.1 |
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*/ |
#import "AVSEAddWatermarkCommand.h" |
@interface AVSEAddWatermarkCommand (Internal) |
-(CALayer*)watermarkLayerForSize:(CGSize)videoSize; |
@end |
@implementation AVSEAddWatermarkCommand |
- (void)performWithAsset:(AVAsset*)asset |
{ |
self.watermarkLayer = nil; |
CGSize videoSize; |
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; |
NSError *error = nil; |
// Step 1 |
// Create a composition with the given asset and insert audio and video tracks into it from the asset |
if(!self.mutableComposition) { |
// Check if a composition already exists, else create a composition using the input asset |
self.mutableComposition = [AVMutableComposition composition]; |
// Insert the video and audio tracks from AVAsset |
if (assetVideoTrack != nil) { |
AVMutableCompositionTrack *compositionVideoTrack = [self.mutableComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; |
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [asset duration]) ofTrack:assetVideoTrack atTime:insertionPoint error:&error]; |
} |
if (assetAudioTrack != nil) { |
AVMutableCompositionTrack *compositionAudioTrack = [self.mutableComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; |
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [asset duration]) ofTrack:assetAudioTrack atTime:insertionPoint error:&error]; |
} |
} |
// Step 2 |
// Create a water mark layer of the same size as that of a video frame from the asset |
if ([[self.mutableComposition tracksWithMediaType:AVMediaTypeVideo] count] != 0) { |
if(!self.mutableVideoComposition) { |
// build a pass through video composition |
self.mutableVideoComposition = [AVMutableVideoComposition videoComposition]; |
self.mutableVideoComposition.frameDuration = CMTimeMake(1, 30); // 30 fps |
self.mutableVideoComposition.renderSize = assetVideoTrack.naturalSize; |
AVMutableVideoCompositionInstruction *passThroughInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; |
passThroughInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, [self.mutableComposition duration]); |
AVAssetTrack *videoTrack = [self.mutableComposition tracksWithMediaType:AVMediaTypeVideo][0]; |
AVMutableVideoCompositionLayerInstruction *passThroughLayer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack]; |
passThroughInstruction.layerInstructions = @[passThroughLayer]; |
self.mutableVideoComposition.instructions = @[passThroughInstruction]; |
} |
videoSize = self.mutableVideoComposition.renderSize; |
self.watermarkLayer = [self watermarkLayerForSize:videoSize]; |
} |
// Step 3 |
// Notify AVSEViewController about add watermark operation completion |
[[NSNotificationCenter defaultCenter] postNotificationName:AVSEEditCommandCompletionNotification object:self]; |
} |
- (CALayer*)watermarkLayerForSize:(CGSize)videoSize |
{ |
// Create a layer for the title |
CALayer *_watermarkLayer = [CALayer layer]; |
// Create a layer for the text of the title. |
CATextLayer *titleLayer = [CATextLayer layer]; |
titleLayer.string = @"AVSE"; |
titleLayer.foregroundColor = [[UIColor whiteColor] CGColor]; |
titleLayer.shadowOpacity = 0.5; |
titleLayer.alignmentMode = kCAAlignmentCenter; |
titleLayer.bounds = CGRectMake(0, 0, videoSize.width/2, videoSize.height/2); |
// Add it to the overall layer. |
[_watermarkLayer addSublayer:titleLayer]; |
return _watermarkLayer; |
} |
@end |
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