IOS多张图片合成一个视频

来源：互联网发布：java雷电游戏源代码编辑：程序博客网时间：2024/05/02 02:45
图片合成视频

首先需要导入的三个依赖库
AVKit.framework MediaPlayer.framework AVFoundation.framework
下面代码中的注释很清楚, 就不做多解释, 直接上代码了
#import "ViewController.h"#import <AVFoundation/AVFoundation.h>#import <MediaPlayer/MediaPlayer.h>#import <AVKit/AVKit.h>@interface ViewController (){    NSMutableArray *imageArr;//未压缩的图片    NSMutableArray *imageArray;//经过压缩的图片}@property (nonatomic, strong) NSString *theVideoPath;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    imageArray = [[NSMutableArray alloc] init];    imageArr =[[NSMutableArray alloc]initWithObjects:               [UIImage imageNamed:@"IMG_3811.jpg"],[UIImage imageNamed:@"IMG_3812.jpg"],[UIImage imageNamed:@"IMG_3813.jpg"],[UIImage imageNamed:@"IMG_3814.jpg"],[UIImage imageNamed:@"IMG_3815.jpg"],[UIImage imageNamed:@"IMG_3816.jpg"],[UIImage imageNamed:@"IMG_3817.jpg"],[UIImage imageNamed:@"IMG_3818.jpg"],[UIImage imageNamed:@"IMG_3820.jpg"],[UIImage imageNamed:@"IMG_3821.jpg"],[UIImage imageNamed:@"IMG_3822.jpg"],[UIImage imageNamed:@"IMG_3823.jpg"],[UIImage imageNamed:@"IMG_3824.jpg"],[UIImage imageNamed:@"IMG_3825.jpg"],[UIImage imageNamed:@"IMG_3826.jpg"],[UIImage imageNamed:@"IMG_3827.jpg"],[UIImage imageNamed:@"IMG_3828.jpg"],[UIImage imageNamed:@"IMG_3829.jpg"],[UIImage imageNamed:@"IMG_3830.jpg"],[UIImage imageNamed:@"IMG_3831.jpg"],[UIImage imageNamed:@"IMG_3832.jpg"],[UIImage imageNamed:@"IMG_3833.jpg"],[UIImage imageNamed:@"IMG_3834.jpg"],[UIImage imageNamed:@"IMG_3835.jpg"],[UIImage imageNamed:@"IMG_3836.jpg"],[UIImage imageNamed:@"IMG_3837.jpg"],[UIImage imageNamed:@"IMG_3838.jpg"],[UIImage imageNamed:@"IMG_3839.jpg"],[UIImage imageNamed:@"IMG_3840.jpg"],[UIImage imageNamed:@"IMG_3841.jpg"],[UIImage imageNamed:@"IMG_3842.jpg"],[UIImage imageNamed:@"IMG_3843.jpg"],[UIImage imageNamed:@"IMG_3844.jpg"],[UIImage imageNamed:@"IMG_3845.jpg"],[UIImage imageNamed:@"IMG_3846.jpg"],nil];        for (int i = 0; i<imageArr.count; i++) {        UIImage *imageNew = imageArr[i];        //设置image的尺寸        CGSize imagesize = imageNew.size;        imagesize.height =408;        imagesize.width =306;           //对图片大小进行压缩--        imageNew = [self imageWithImage:imageNew scaledToSize:imagesize];        [imageArray addObject:imageNew];    }        UIButton * button =[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button setFrame:CGRectMake(100,100, 100,50)];    [button setTitle:@"视频合成"forState:UIControlStateNormal];    [button addTarget:self action:@selector(testCompressionSession)forControlEvents:UIControlEventTouchUpInside];    button.backgroundColor = [UIColor redColor];    [self.view addSubview:button];        UIButton * button1 =[UIButton buttonWithType:UIButtonTypeRoundedRect];    [button1 setFrame:CGRectMake(100,200, 100,50)];    [button1 setTitle:@"视频播放"forState:UIControlStateNormal];    [button1 addTarget:self action:@selector(playAction)forControlEvents:UIControlEventTouchUpInside];    button1.backgroundColor = [UIColor redColor];    [self.view addSubview:button1];}//对图片尺寸进行压缩---(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize{//    新创建的位图上下文 newSize为其大小    UIGraphicsBeginImageContext(newSize);//    对图片进行尺寸的改变    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];//    从当前上下文中获取一个UIImage对象  即获取新的图片对象    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    // Return the new image.    return newImage;}-(void)testCompressionSession{    //设置mov路径    NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);    NSString *moviePath =[[paths objectAtIndex:0]stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mov",@"test"]];    self.theVideoPath=moviePath;        //定义视频的大小320 480 倍数    CGSize size =CGSizeMake(320,480);    //        [selfwriteImages:imageArr ToMovieAtPath:moviePath withSize:sizeinDuration:4 byFPS:30];//第2中方法        NSError *error =nil;//    转成UTF-8编码    unlink([moviePath UTF8String]);    NSLog(@"path->%@",moviePath);//     iphone提供了AVFoundation库来方便的操作多媒体设备，AVAssetWriter这个类可以方便的将图像和音频写成一个完整的视频文件    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:moviePath] fileType:AVFileTypeQuickTimeMovie error:&error];        NSParameterAssert(videoWriter);    if(error)        NSLog(@"error =%@", [error localizedDescription]);    //mov的格式设置 编码格式 宽度 高度    NSDictionary *videoSettings =[NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264,AVVideoCodecKey,                                  [NSNumber numberWithInt:size.width],AVVideoWidthKey,                                  [NSNumber numberWithInt:size.height],AVVideoHeightKey,nil];        AVAssetWriterInput *writerInput =[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];    NSDictionary*sourcePixelBufferAttributesDictionary =[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:kCVPixelFormatType_32ARGB],kCVPixelBufferPixelFormatTypeKey,nil];//    AVAssetWriterInputPixelBufferAdaptor提供CVPixelBufferPool实例,//    可以使用分配像素缓冲区写入输出文件。使用提供的像素为缓冲池分配通常//    是更有效的比添加像素缓冲区分配使用一个单独的池    AVAssetWriterInputPixelBufferAdaptor *adaptor =[AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];        NSParameterAssert(writerInput);    NSParameterAssert([videoWriter canAddInput:writerInput]);        if ([videoWriter canAddInput:writerInput])    {        NSLog(@"11111");    }    else    {        NSLog(@"22222");            }        [videoWriter addInput:writerInput];        [videoWriter startWriting];    [videoWriter startSessionAtSourceTime:kCMTimeZero];        //合成多张图片为一个视频文件    dispatch_queue_t dispatchQueue =dispatch_queue_create("mediaInputQueue",NULL);    int __block frame =0;    [writerInput requestMediaDataWhenReadyOnQueue:dispatchQueue usingBlock:^{        while([writerInput isReadyForMoreMediaData])        {            if(++frame >=[imageArray count]*10)            {                [writerInput markAsFinished];                [videoWriter finishWriting];                //              [videoWriterfinishWritingWithCompletionHandler:nil];                break;            }            CVPixelBufferRef buffer =NULL;            int idx =frame/10;            NSLog(@"idx==%d",idx);            buffer = (CVPixelBufferRef)[self pixelBufferFromCGImage:[[imageArray objectAtIndex:idx] CGImage] size:size];                        if (buffer)            {                if(![adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(frame,30)])//设置每秒钟播放图片的个数                {                    NSLog(@"FAIL");                }                else                {                     NSLog(@"OK");                }                                CFRelease(buffer);            }        }    }];}- (CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)image size:(CGSize)size{    NSDictionary *options =[NSDictionary dictionaryWithObjectsAndKeys:                            [NSNumber numberWithBool:YES],kCVPixelBufferCGImageCompatibilityKey,                            [NSNumber numberWithBool:YES],kCVPixelBufferCGBitmapContextCompatibilityKey,nil];    CVPixelBufferRef pxbuffer =NULL;    CVReturn status =CVPixelBufferCreate(kCFAllocatorDefault,size.width,size.height,kCVPixelFormatType_32ARGB,(__bridge CFDictionaryRef) options,&pxbuffer);        NSParameterAssert(status ==kCVReturnSuccess && pxbuffer !=NULL);        CVPixelBufferLockBaseAddress(pxbuffer,0);        void *pxdata =CVPixelBufferGetBaseAddress(pxbuffer);    NSParameterAssert(pxdata !=NULL);    CGColorSpaceRef rgbColorSpace=CGColorSpaceCreateDeviceRGB();//    当你调用这个函数的时候，Quartz创建一个位图绘制环境，也就是位图上下文。当你向上下文中绘制信息时，Quartz把你要绘制的信息作为位图数据绘制到指定的内存块。一个新的位图上下文的像素格式由三个参数决定：每个组件的位数，颜色空间，alpha选项    CGContextRef context =CGBitmapContextCreate(pxdata,size.width,size.height,8,4*size.width,rgbColorSpace,kCGImageAlphaPremultipliedFirst);    NSParameterAssert(context);        //使用CGContextDrawImage绘制图片  这里设置不正确的话 会导致视频颠倒//    当通过CGContextDrawImage绘制图片到一个context中时，如果传入的是UIImage的CGImageRef，因为UIKit和CG坐标系y轴相反，所以图片绘制将会上下颠倒    CGContextDrawImage(context,CGRectMake(0,0,CGImageGetWidth(image),CGImageGetHeight(image)), image);    // 释放色彩空间    CGColorSpaceRelease(rgbColorSpace);    // 释放context    CGContextRelease(context);    // 解锁pixel buffer    CVPixelBufferUnlockBaseAddress(pxbuffer,0);        return pxbuffer;}//播放-(void)playAction{    NSLog(@"************%@",self.theVideoPath);    NSURL *sourceMovieURL = [NSURL fileURLWithPath:self.theVideoPath];    AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:sourceMovieURL options:nil];    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];    AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];    AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];    playerLayer.frame = self.view.layer.bounds;    playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;    [self.view.layer addSublayer:playerLayer];    [player play];}
注意事项: 我这里的图片是手机直接进行拍的, 直接拍的图片不进行压缩的话, 合成视频的时间会很长,
这里我进行压缩后合成, 时间会很短 35张图片进行合成差不多3秒左右
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