ios - 尝试将 CIImage 与从视频文件帧获得的纹理一起使用时，CIImage 为空白

Question

我正在尝试创建一个将过滤器应用于视频文件的应用程序。我想使用核心图像过滤器

    imageBuffer obtained from AVAssetReaderInput

    int height = (int)CVPixelBufferGetHeight(imageBuffer);
    int width = (int)CVPixelBufferGetWidth(imageBuffer);

    glActiveTexture(GL_TEXTURE0);
    CVReturn error;
    CVOpenGLESTextureRef _textureRef;
    error = CVOpenGLESTextureCacheCreateTextureFromImage (kCFAllocatorDefault,
                                                          self.openGLContext.textureCache,
                                                          imageBuffer,
                                                          NULL, // texture attributes
                                                          GL_TEXTURE_2D,
                                                          GL_RGBA, // opengl format
                                                          width,
                                                          height,
                                                          GL_BGRA,
                                                          GL_UNSIGNED_BYTE, // native iOS format
                                                          0,
                                                          &_textureRef);

    if (error) {
      NSLog(@"Error while creating Texture");
    }


    glBindTexture(CVOpenGLESTextureGetTarget(_textureRef), CVOpenGLESTextureGetName(_textureRef));
    GLint texture = CVOpenGLESTextureGetName(_textureRef);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    CIContext *context = [CIContext contextWithEAGLContext:self.openGLContext.context options:nil];

    CIImage *my_image = [CIImage imageWithTexture:texture size:CGSizeMake(1280, 720) flipped:NO colorSpace:nil];

CIImage (my_image) 始终为空白(即显示为黑色)并且不包含视频纹理。我正在 iPhone 6 设备上测试它。我哪里错了？

Answer 1

你为什么不用它来创建你的 CIImage:

     CIImage *inputImage = [CIImage imageWithCVPixelBuffer:imageBuffer options:nil];

您可以将滤镜应用于此图像。