Question

我必须使用AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection:捕获一堆图像并使用 OpenGL 作为纹理在屏幕上渲染它们，我从传递 CVPixelBufferRef >捕获输出的CMSampleBufferRef 。第一次捕获成功发生，但对于后续捕获，我收到错误

Error Domain=AVFoundationErrorDomain Code=-11801 "Cannot Complete Action"

代码如下。

dispatch_async(dispatch_get_main_queue(), ^{
    if (self.videoConnection) {
        [self.imageOutput captureStillImageAsynchronouslyFromConnection:self.videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
            if (!imageDataSampleBuffer) {
                return ;
            }
            if (imageDataSampleBuffer) {
                CVPixelBufferRef pxBuff = CMSampleBufferGetImageBuffer(imageDataSampleBuffer);
                if ([self.captureDelegate respondsToSelector:@selector(didCaptureBufferRef:)]) {
                    [_captureDelegate didCaptureBufferRef:pxBuff];
                }
            }
        }];
    }});

和

didCaptureBufferRef:

最终调用此函数（我跳过了中间调用，因为 pxBuff 在任何地方都没有使用，只是传递过来）

- (void)textureFromBufferRef:(CVPixelBufferRef)pixelBuffer
{
size_t width = CVPixelBufferGetWidth(pixelBuffer);
size_t height = CVPixelBufferGetHeight(pixelBuffer);

glActiveTexture(GL_TEXTURE0);

CVReturn err  = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, _textureCacheRef, pixelBuffer, NULL, GL_TEXTURE_2D, GL_RED_EXT, (GLsizei)width, (GLsizei)height, GL_RED_EXT, GL_UNSIGNED_BYTE, 0, &_captureImageTextureRef);
glBindTexture(CVOpenGLESTextureGetTarget(_captureImageTextureRef), CVOpenGLESTextureGetName(_captureImageTextureRef));
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(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);
}

我在这里做错了什么？当我删除

[_captureDelegate didCaptureBufferRef:pxBuff];

事情很好，捕获成功。

使用“图像数据样本”渲染OpenGL纹理时，捕获静止图像失败

0 个答案: