用CVOpenGLESTextureCache记录GLKView到mov文件

Question

我是新来的opengl，我试图记录GLKView到目前为止没有运气。 这里是我的代码：

 EAGLContext * _context = self.glkview.context; 

#if COREVIDEO_USE_EAGLCONTEXT_CLASS_IN_API 
    CVReturn err = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, NULL, _context, NULL, &_videoTextureCache); 
#else 
    CVReturn err = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, NULL, (__bridge void *)_context, NULL, &_videoTextureCache); 
#endif 
    if (err) 
    { 
     NSLog(@"Error at CVOpenGLESTextureCacheCreate %d", err); 
     return; 
    } 


    CFDictionaryRef empty; // empty value for attr value. 
CFMutableDictionaryRef attrs; 
empty = CFDictionaryCreate(kCFAllocatorDefault, // our empty IOSurface properties dictionary 
          NULL, 
          NULL, 
          0, 
          &kCFTypeDictionaryKeyCallBacks, 
          &kCFTypeDictionaryValueCallBacks); 
attrs = CFDictionaryCreateMutable(kCFAllocatorDefault, 
            1, 
            &kCFTypeDictionaryKeyCallBacks, 
            &kCFTypeDictionaryValueCallBacks); 

CFDictionarySetValue(attrs, 
        kCVPixelBufferIOSurfacePropertiesKey, 
        empty); 

// for simplicity, lets just say the image is 640x480 
CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, 
        kCVPixelFormatType_32BGRA, 
        attrs, 
        &renderTarget); 
// in real life check the error return value of course. 


// first create a texture from our renderTarget 
// textureCache will be what you previously made with CVOpenGLESTextureCacheCreate 
CVOpenGLESTextureRef renderTexture; 
CVOpenGLESTextureCacheCreateTextureFromImage (
               kCFAllocatorDefault, 
               _videoTextureCache, 
               renderTarget, 
               NULL, // texture attributes 
               GL_TEXTURE_2D, 
               GL_RGBA, // opengl format 
               640, 
               480, 
               GL_BGRA, // native iOS format 
               GL_UNSIGNED_BYTE, 
               0, 
               &renderTexture); 
// check err value 

// set the texture up like any other texture 
glBindTexture(CVOpenGLESTextureGetTarget(renderTexture), 
       CVOpenGLESTextureGetName(renderTexture)); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 

// bind the texture to the framebuffer you're going to render to 
// (boilerplate code to make a framebuffer not shown) 

glPixelStorei(GL_UNPACK_ALIGNMENT,4); 

glGenTextures(1, &_texureName); 
glBindTexture(GL_TEXTURE_2D, _texureName); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei) 1024, (GLsizei) 768, 0, GL_RGBA, GL_UNSIGNED_BYTE, CVPixelBufferGetBaseAddress(renderTarget)); 

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, 
         GL_TEXTURE_2D, CVOpenGLESTextureGetName(renderTexture), 0); 

这是写它的文件的方法。

- (void)writeVideoFrameAtTime:(CMTime)time { 

    if (_videoTextureCache == NULL) 
     return; 

     BOOL success = [_assetWriterPixelBufferInput appendPixelBuffer:renderTarget withPresentationTime:time]; 
     //NSLog(@"writing"); 
     if (!success) { 
      NSLog(@"Pixel Buffer not appended"); 
     } 

} 

Answer 1

你可以试试这一个，它是免费的，它是用 https://developers.everyplay.com