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+//
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+// AliyunCoverPickView.m
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+// qusdk
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+//
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+// Created by Worthy on 2017/11/7.
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+// Copyright © 2017年 Alibaba Group Holding Limited. All rights reserved.
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+//
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+
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+#import "AliyunCoverPickView.h"
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+#import "AVAsset+VideoInfo.h"
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+#import "AVC_ShortVideo_Config.h"
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+#import <AVFoundation/AVFoundation.h>
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+@interface AliyunCoverPickView ()
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+@property(nonatomic, strong) UICollectionView *collectionView;
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+@property(nonatomic, strong) UIImageView *progressView;
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+@property(nonatomic, strong) NSMutableArray *imagesArray;
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+@property(nonatomic, strong) AVAssetImageGenerator *imageGenerator;
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+@property(nonatomic, strong) AVAssetImageGenerator *pickGenerator;
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+@property(nonatomic, assign) CGFloat duration;
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+@property(nonatomic, assign) BOOL imageCaptured;
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+@end
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+
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+@implementation AliyunCoverPickView
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+
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+- (instancetype)initWithFrame:(CGRect)frame {
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+ self = [super initWithFrame:frame];
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+ if (self) {
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+ _imagesArray = [NSMutableArray arrayWithCapacity:8];
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+ [self setupSubviews];
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+ }
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+ return self;
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+}
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+
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+- (void)setupSubviews {
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+ UICollectionViewFlowLayout *followLayout =
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+ [[UICollectionViewFlowLayout alloc] init];
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+ followLayout.itemSize =
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+ CGSizeMake(CGRectGetHeight(self.frame), CGRectGetHeight(self.frame));
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+ followLayout.minimumLineSpacing = 0;
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+ followLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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+
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+ _collectionView = [[UICollectionView alloc]
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+ initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.frame),
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+ CGRectGetHeight(self.frame))
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+ collectionViewLayout:followLayout];
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+ _collectionView.dataSource = (id<UICollectionViewDataSource>)self;
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+ [_collectionView registerClass:[UICollectionViewCell class]
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+ forCellWithReuseIdentifier:@"cell"];
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+ [self addSubview:_collectionView];
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+ UIView *view = [[UIView alloc] initWithFrame:self.bounds];
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+ view.backgroundColor = [UIColor clearColor];
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+ [self addSubview:view];
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+ _progressView = [[UIImageView alloc]
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+ initWithImage:[AliyunImage imageNamed:@"icon_cover_slide"]];
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+ _progressView.frame = CGRectMake(0, 0, 4, CGRectGetHeight(self.frame));
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+ [view addSubview:_progressView];
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+}
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+
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+- (void)parseAsset {
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+ AVURLAsset *asset =
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+ [AVURLAsset assetWithURL:[NSURL fileURLWithPath:_videoPath]];
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+ _duration = [asset avAssetVideoTrackDuration];
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+}
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+
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+- (void)loadThumbnailData {
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+ [self parseAsset];
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+
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+ _selectedImage = [self coverImageAtTime:CMTimeMake(0.1 * 1000, 1000)];
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+ [_delegate pickViewDidUpdateImage:_selectedImage];
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+
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+ CMTime startTime = kCMTimeZero;
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+ NSMutableArray *array = [NSMutableArray array];
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+ CMTime addTime = CMTimeMake(_duration * 1000 / 8.0f, 1000);
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+
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+ CMTime endTime = CMTimeMake(_duration * 1000, 1000);
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+ while (CMTIME_COMPARE_INLINE(startTime, <, endTime)) {
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+ [array addObject:[NSValue valueWithCMTime:startTime]];
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+ startTime = CMTimeAdd(startTime, addTime);
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+ }
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+ // 第一帧取第0.1s 规避有些视频并不是从第0s开始的
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+ array[0] = [NSValue valueWithCMTime:CMTimeMake(0.1 * 1000, 1000)];
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+
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+ __block int index = 0;
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+ [self.imageGenerator
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+ generateCGImagesAsynchronouslyForTimes:array
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+ completionHandler:^(
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+ CMTime requestedTime, CGImageRef _Nullable image,
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+ CMTime actualTime,
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+ AVAssetImageGeneratorResult result,
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+ NSError *_Nullable error) {
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+ if (result == AVAssetImageGeneratorSucceeded) {
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+ UIImage *img =
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+ [[UIImage alloc] initWithCGImage:image];
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+ dispatch_async(dispatch_get_main_queue(), ^{
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+ [_imagesArray addObject:img];
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+ NSIndexPath *indexPath =
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+ [NSIndexPath indexPathForItem:index
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+ inSection:0];
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+ [_collectionView
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+ insertItemsAtIndexPaths:@[ indexPath ]];
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+ index++;
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+ });
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+ }
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+ }];
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+}
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+
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+- (NSInteger)collectionView:(UICollectionView *)collectionView
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+ numberOfItemsInSection:(NSInteger)section {
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+ return _imagesArray.count;
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+}
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+
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+- (__kindof UICollectionViewCell *)collectionView:
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+ (UICollectionView *)collectionView
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+ cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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+ UICollectionViewCell *cell =
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+ [collectionView dequeueReusableCellWithReuseIdentifier:@"cell"
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+ forIndexPath:indexPath];
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+ UIImage *image = _imagesArray[indexPath.row];
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+ UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
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+ imageView.frame = cell.contentView.bounds;
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+ imageView.contentMode = UIViewContentModeScaleAspectFill;
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+ imageView.clipsToBounds = YES;
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+ [cell.contentView addSubview:imageView];
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+ return cell;
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+}
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+
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+- (AVAssetImageGenerator *)imageGenerator {
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+ if (!_imageGenerator) {
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+ AVURLAsset *asset =
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+ [AVURLAsset assetWithURL:[NSURL fileURLWithPath:_videoPath]];
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+ _imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
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+ _imageGenerator.appliesPreferredTrackTransform = YES;
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+ _imageGenerator.requestedTimeToleranceBefore = kCMTimeZero;
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+ _imageGenerator.requestedTimeToleranceAfter = kCMTimeZero;
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+ _imageGenerator.maximumSize = CGSizeMake(100, 100);
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+ }
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+ return _imageGenerator;
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+}
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+
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+- (AVAssetImageGenerator *)pickGenerator {
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+ if (!_imageGenerator) {
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+ AVURLAsset *asset =
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+ [AVURLAsset assetWithURL:[NSURL fileURLWithPath:_videoPath]];
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+ _imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
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+ _imageGenerator.appliesPreferredTrackTransform = YES;
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+ _imageGenerator.requestedTimeToleranceBefore = kCMTimeZero;
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+ _imageGenerator.requestedTimeToleranceAfter = kCMTimeZero;
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+ _imageGenerator.maximumSize = _outputSize;
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+ }
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+ return _imageGenerator;
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+}
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+
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+- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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+ UITouch *touch = (UITouch *)[touches anyObject];
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+ CGPoint point = [touch locationInView:self.collectionView];
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+ CGFloat percent = point.x / CGRectGetWidth(self.frame);
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+ if (percent < 0) {
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+ percent = 0;
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+ } else if (percent > 1) {
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+ percent = 1;
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+ }
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+ CMTime time = CMTimeMake(percent * _duration * 1000, 1000);
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+ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
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+ ^{
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+ _selectedImage = [self coverImageAtTime:time];
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+ [_delegate pickViewDidUpdateImage:_selectedImage];
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+ _imageCaptured = YES;
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+ });
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+ self.progressView.center = CGPointMake(CGRectGetWidth(self.frame) * percent,
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+ CGRectGetHeight(self.frame) / 2);
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+}
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+
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+- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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+ UITouch *touch = (UITouch *)[touches anyObject];
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+ CGPoint point = [touch locationInView:self.collectionView];
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+ CGFloat percent = point.x / CGRectGetWidth(self.frame);
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+ if (percent < 0) {
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+ percent = 0;
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+ } else if (percent > 1) {
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+ percent = 1;
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+ }
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+ CMTime time = CMTimeMake(percent * _duration * 1000, 1000);
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+ if (_imageCaptured) {
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+ _imageCaptured = NO;
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+ dispatch_async(
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+ dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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+ _selectedImage = [self coverImageAtTime:time];
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+ [_delegate pickViewDidUpdateImage:_selectedImage];
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+ _imageCaptured = YES;
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+ });
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+ }
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+ self.progressView.center = CGPointMake(CGRectGetWidth(self.frame) * percent,
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+ CGRectGetHeight(self.frame) / 2);
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+}
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+
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+- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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+ UITouch *touch = (UITouch *)[touches anyObject];
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+ CGPoint point = [touch locationInView:self.collectionView];
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+ CGFloat percent = point.x / CGRectGetWidth(self.frame);
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+ if (percent < 0) {
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+ percent = 0;
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+ } else if (percent > 1) {
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+ percent = 1;
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+ }
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+ CMTime time = CMTimeMake(percent * _duration * 1000, 1000);
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+ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
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+ ^{
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+ _selectedImage = [self coverImageAtTime:time];
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+ [_delegate pickViewDidUpdateImage:_selectedImage];
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+ });
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+ self.progressView.center = CGPointMake(CGRectGetWidth(self.frame) * percent,
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+ CGRectGetHeight(self.frame) / 2);
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+}
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+
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+- (UIImage *)coverImageAtTime:(CMTime)time {
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+ CGImageRef image = [self.pickGenerator copyCGImageAtTime:time
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+ actualTime:NULL
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+ error:nil];
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+ UIImage *picture = [UIImage imageWithCGImage:image];
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+ CGImageRelease(image);
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+ return picture;
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+}
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+@end
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Chris