GPUImage--视频流处理之AVCaptureVideoDataOutputSampleBufferDelegate

如果你是第一次看到这篇博客请看http://blog.csdn.net/xoxo_x/article/details/52695032

如果app需求仅仅是自己得到美颜的效果, 请看这里http://blog.csdn.net/xoxo_x/article/details/52743107

如果想了解更多的滤镜使用方法，请看这里http://blog.csdn.net/xoxo_x/article/details/52749033

接下来咱们要做的工作是如何对 CMSampleBufferRef 数据进行渲染、然后显示 美颜效果

一、通过AVCaptureVideoDataOutputSampleBufferDelegate获取视频流：

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVCaptureVideoDataOutputSampleBufferDelegate>

@property (nonatomic, strong) AVCaptureVideoPreviewLayer  *preLayer;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setupCaptureSession];
}
//捕获到视频的回调函数
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection
{

}
//开启摄像头
- (void)setupCaptureSession
{
    NSError *error = nil;

     // 创建session
    AVCaptureSession *session = [[AVCaptureSession alloc] init];

       // 可以配置session以产生解析度较低的视
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