全網(wǎng)找了一圈也沒(méi)有看到一個(gè) GPUImageRawDataInput 的完整 Demo囚霸，這里提供一個(gè)簡(jiǎn)單的使用示例腰根，Demo：

#import "RawDataViewController.h"
#import "GPUImage.h"

@interface RawDataViewController ()

@property (nonatomic, strong) GPUImageRawDataInput *rawDataInput;
@property (nonatomic, strong) GPUImageRawDataOutput *rawDataOutput;

@property (nonatomic, strong) GPUImageBrightnessFilter *filter;
@property (nonatomic, strong) GPUImageView *filterView;

@end


@implementation RawDataViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.filterView = [[GPUImageView alloc] initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 300)];
    [self.view addSubview:self.filterView];
    
    
    // 1. UIImage -> CGImage -> CFDataRef -> UInt8 * data
    UIImage *image = [UIImage imageNamed:@"img1.jpg"];
    CGImageRef newImageSource = [image CGImage];
    CFDataRef dataFromImageDataProvider = CGDataProviderCopyData(CGImageGetDataProvider(newImageSource));
    GLubyte* imageData = (GLubyte *)CFDataGetBytePtr(dataFromImageDataProvider);
    
    // 2. UInt8 * data -> GPUImageRawDataInput
    self.rawDataInput = [[GPUImageRawDataInput alloc] initWithBytes:imageData size:image.size pixelFormat:GPUPixelFormatRGBA];
    
    self.filter = [[GPUImageBrightnessFilter alloc] init];
    self.filter.brightness = 0.1;
    

    [self.rawDataInput addTarget:self.filter];
    // 3. 輸出到 GPUImageView
    [self.filter addTarget:self.filterView];

    
    // 4. 同時(shí)輸出到 raw data output
    self.rawDataOutput = [[GPUImageRawDataOutput alloc] initWithImageSize:image.size resultsInBGRAFormat:YES];
    [self.filter addTarget:self.rawDataOutput];
    
    // important
    [self.filter useNextFrameForImageCapture];
    [self.rawDataInput processData];
    
    
    // 5. read data from GPUImageRawDataOutput
    [self.rawDataOutput lockFramebufferForReading];
    
    GLubyte *outputBytes = [self.rawDataOutput rawBytesForImage];
    NSInteger bytesPerRow = [self.rawDataOutput bytesPerRowInOutput];

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, outputBytes, bytesPerRow * image.size.height, NULL);
    CGImageRef cgImage = CGImageCreate(image.size.width, image.size.height, 8, 32, bytesPerRow, rgbColorSpace, kCGImageAlphaPremultipliedFirst|kCGBitmapByteOrder32Little, provider, NULL, true, kCGRenderingIntentDefault);
    
    [self.rawDataOutput unlockFramebufferAfterReading];

    // 斷點(diǎn)到這一行，查看 outImage
    UIImage *outImage = [UIImage imageWithCGImage:cgImage];
    NSLog(@"%@", outImage);
}

@end

使用場(chǎng)景

這個(gè)示例的使用場(chǎng)景：

• 用 ffmpeg 將視頻流的一幀讀取成 RGBA 數(shù)據(jù)拓型；
• 將數(shù)據(jù)傳入 GPUImageRawDataInput -> 添加濾鏡 -> 輸出到 GPUImageRawDataOutput
• 從 GPUImageRawDataOutput 中取出 RGBA 數(shù)據(jù)额嘿，再交給 ffmpeg 編碼，寫(xiě)入新的視頻文件

注：

• 這個(gè)流程使用 GPUImage 完全可以完成劣挫，不需要 ffmpeg册养；需要跨平臺(tái)的編解碼并加濾鏡時(shí)，可以使用 OpenGL 對(duì)視頻流加濾鏡揣云；
• 在 Xcode 里斷點(diǎn)查看 UIImage 的方法如下：