//
// ViewController.m
// VideoFrame
//
// Created by wiseman on 16/1/27.
// Copyright (c) 2016年 wiseman. All rights reserved.
// #import "ViewController.h"
#import <AVFoundation/AVFoundation.h> @interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegate>
@property (weak, nonatomic) IBOutlet UICollectionView *myCollectionView;
@property (weak, nonatomic) IBOutlet UICollectionViewFlowLayout *myFlowLayout; @property(nonatomic,strong) NSMutableArray *Arr; @end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//注册cell
static NSString *ID = @"mycell";
[self.myCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:ID]; self.myFlowLayout.itemSize = CGSizeMake((self.view.bounds.size.width-)/, (self.view.bounds.size.width-)/); [self getVideoFrame];
} #pragma mark - Array
-(NSMutableArray *)Arr{
if (!_Arr) {
_Arr = [NSMutableArray array];
}
return _Arr;
} #pragma mark - GetVideoFrame
-(void)getVideoFrame{
//1.本地mp4的地址
NSString *path = [[NSBundle mainBundle] pathForResource:@"ddd" ofType:@"mp4"];
//2.URL
NSURL *pathURL = [NSURL fileURLWithPath:path];
//3.Setting
//3.1初始化asset对象
AVURLAsset *videoAsset = [[AVURLAsset alloc]initWithURL:pathURL options:nil];
//3.2 获取总视频的长度 = 总帧数 / 每秒的帧数
long videoSumTime = videoAsset.duration.value / videoAsset.duration.timescale;
//3.3 根据人眼每秒24帧图像，计算出每秒24帧情况下的总帧数
long eyeSumValue = videoSumTime * ;
//总帧数 / 块数
long kuai = videoAsset.duration.value / eyeSumValue;
//4.创建AVAssetImageGenerator对象
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc]initWithAsset:videoAsset];
generator.maximumSize = self.view.frame.size;
generator.appliesPreferredTrackTransform = YES;
generator.requestedTimeToleranceBefore = kCMTimeZero;
generator.requestedTimeToleranceAfter = kCMTimeZero;
//5. 添加需要帧数的时间集合
NSMutableArray *arr1 = [NSMutableArray array];
for (int i = ; i < eyeSumValue; i ++) {
CMTime time = CMTimeMake(i * kuai, videoAsset.duration.timescale);
NSValue *value = [NSValue valueWithCMTime:time];
[arr1 addObject:value];
} static long count = ;
[generator generateCGImagesAsynchronouslyForTimes:arr1 completionHandler:^(CMTime requestedTime, CGImageRef im, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){
// NSString *requestedTimeString = (NSString *)
// CFBridgingRelease(CMTimeCopyDescription(NULL, requestedTime));
// NSString *actualTimeString = (NSString *)
// CFBridgingRelease(CMTimeCopyDescription(NULL, actualTime));
// NSLog(@"Requested: %@; actual %@", requestedTimeString, actualTimeString);
if (result == AVAssetImageGeneratorSucceeded) {
count++;
NSLog(@"%ld",count);
[self.Arr addObject:[UIImage imageWithCGImage:im]];
if (count == eyeSumValue) {
[self.myCollectionView reloadData];
}
} if (result == AVAssetImageGeneratorFailed) {
NSLog(@"Failed with error: %@", [error localizedDescription]);
} if (result == AVAssetImageGeneratorCancelled) {
NSLog(@"AVAssetImageGeneratorCancelled");
}
}]; } #pragma mark - UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return self.Arr.count;
} - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *ID = @"mycell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:ID forIndexPath:indexPath];
if (!cell) {
cell = [[UICollectionViewCell alloc]init];
} UIImageView *imgView = [[UIImageView alloc]initWithFrame:cell.bounds];
imgView.image = self.Arr[indexPath.row];
[cell.contentView addSubview:imgView]; return cell;
} - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
} @end