Question

我尝试从相机接收的像素缓冲区中提取yuv数据，然后重新创建一个像素缓冲区，但我在CVOpenGLESTextureCacheCreateTextureFromImage中获得-6683，文档只是说明了

由于缓冲区大小，像素格式或属性不受支持，像素缓冲区与OpenGL不兼容。

这对我没有多大帮助。我该如何解决？代码如下：

- (void)Init
{
    *****;
    OSStatus err = CMBufferQueueCreate(kCFAllocatorDefault, 1, CMBufferQueueGetCallbacksForUnsortedSampleBuffers(), &previewBufferQueue);

}
- (void)captureOutput:(AVCaptureOutput *)captureOutput 
    didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
   fromConnection:(AVCaptureConnection *)connection
{


  OSStatus err = CMBufferQueueEnqueue(previewBufferQueue, sampleBuffer);
  if ( !err ) {        
    dispatch_async(dispatch_get_main_queue(), ^{
        CMSampleBufferRef sbuf = (CMSampleBufferRef)CMBufferQueueDequeueAndRetain(previewBufferQueue);
        if (sbuf) {
            CVImageBufferRef pixBuf = CMSampleBufferGetImageBuffer(sbuf);
            [self.delegate displayPixelBuffer:pixBuf];
            CFRelease(sbuf);
         }
     });
   }
}

displayPixelBuffer方法：

-(void)displayPixelBuffer:(CVImageBufferRef)pixelBuffer
{
     CVPixelBufferLockBaseAddress(pixelBuffer, 0);
     size_t planeWidth[2] = {CVPixelBufferGetWidthOfPlane(pixelBuffer, 0), width};
     size_t planeHeight[2] = {CVPixelBufferGetHeightOfPlane(pixelBuffer, 0),  
     CVPixelBufferGetHeightOfPlane(pixelBuffer, 1)};
     size_t planeBytesPerRow[2] = {CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0), width/2};

    unsigned char *YUV2[2] = {0};
    YUV2[0] = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0);
    YUV2[1] = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1);

    CVReturn renturn = CVPixelBufferCreateWithPlanarBytes(kCFAllocatorDefault,
                                                      width, 
                                                      height,
                                                      kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange, 
                                                      0,
                                                      0,
                                                      2, 
                                                      (void *)YUV2,
                                                      planeWidth,
                                                      planeHeight, 
                                                      planeBytesPerRow, 
                                                      nil,
                                                      nil, nil, &imageBuffer);


   glActiveTexture(GL_TEXTURE0);
   CVOpenGLESTextureRef texture = NULL;
   CVReturn err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, 
                                                            videoTextureCache,
                                                            imageBuffer,
                                                            NULL,
                                                            GL_TEXTURE_2D,
                                                            GL_LUMINANCE,
                                                            width,
                                                            height,
                                                            GL_LUMINANCE,
                                                            GL_UNSIGNED_BYTE,
                                                            0,
                                                            &texture);

   if (!texture || err) {
      NSLog(@"CVOpenGLESTextureCacheCreateTextureFromImage failed (error: %d)", err);  
      return;
   }
    glBindTexture(CVOpenGLESTextureGetTarget(texture), 0);

   // Flush the CVOpenGLESTexture cache and release the texture
   CVOpenGLESTextureCacheFlush(videoTextureCache, 0);
   CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
   CFRelease(texture);

}

结果是CVOpenGLESTextureCacheCreateTextureFromImage失败（错误：-6683），为什么？

Answer 1

我相信CVPixelBuffer需要是一个ioSurfaceBacked。

Answer 2

您从图像缓冲区中错误地获取了用于创建纹理的属性值。这是＆＃39; a

的方式

done:

- (void)displayPixelBuffer:(CVPixelBufferRef)pixelBuffer
{
    CVReturn err;
    if (pixelBuffer != NULL) {
        int frameWidth = (int)CVPixelBufferGetWidth(pixelBuffer);
        int frameHeight = (int)CVPixelBufferGetHeight(pixelBuffer);



        /*
         CVOpenGLESTextureCacheCreateTextureFromImage will create GLES texture optimally from CVPixelBufferRef.
         */

        /*
         Create Y and UV textures from the pixel buffer. These textures will be drawn on the frame buffer Y-plane.
         */
        glActiveTexture(GL_TEXTURE0);
        err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault,
                                                           _videoTextureCache,
                                                           pixelBuffer,
                                                           NULL,
                                                           GL_TEXTURE_2D,
                                                           GL_RED_EXT,
                                                           frameWidth,
                                                           frameHeight,
                                                           GL_RED_EXT,
                                                           GL_UNSIGNED_BYTE,
                                                           0,
                                                           &_lumaTexture);
        if (err) {
            NSLog(@"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);
        }

        glBindTexture(CVOpenGLESTextureGetTarget(_lumaTexture), CVOpenGLESTextureGetName(_lumaTexture));
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

        // UV-plane.
        glActiveTexture(GL_TEXTURE1);
        err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault,
                                                           _videoTextureCache,
                                                           pixelBuffer,
                                                           NULL,
                                                           GL_TEXTURE_2D,
                                                           GL_RG_EXT,
                                                           frameWidth / 2,
                                                           frameHeight / 2,
                                                           GL_RG_EXT,
                                                           GL_UNSIGNED_BYTE,
                                                           1,
                                                           &_chromaTexture);
        if (err) {
            NSLog(@"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);
        }

        glBindTexture(CVOpenGLESTextureGetTarget(_chromaTexture), CVOpenGLESTextureGetName(_chromaTexture));
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

        glBindFramebuffer(GL_FRAMEBUFFER, _frameBufferHandle);

    }

这是从ADC网站上的AVBasicVideoOutput / APLEAGLView.m复制的。它是我使用的，以及其他公开发布代码的人（实际上是有效的）。如果有一千种方法可以做到这一点，我已经尝试了所有这些方法。就是这样。

注意|这是OpenGL 2.0;如果你准备好3.0，我在我的博客上有一个AVBasicVideoOutput的升级版本：

http://demonicactivity.blogspot.com/2016/02/technology-apples-opengl-related-sample.html?m=1

有关CVOpenGLESTextureCacheCreateTextureFromImage的问题

2 个答案: