ios - 使用混合滤镜时 GPUImage 崩溃 ('over release framebuffer')

Question

我很头疼，因为我在尝试将混合滤镜应用于图像并显示它时遇到崩溃。我想要做的只是将一个叠加图像放在另一个图像上。

这是我的代码:

- (GPUImageOutput<GPUImageInput> *)myFilter
{
    GPUImageFilterGroup *filtersGroup = [GPUImageFilterGroup new];

    // Saturation
    GPUImageSaturationFilter *saturationFilter = [GPUImageSaturationFilter new];
    saturationFilter.saturation = 0.0;
    [filtersGroup addFilter:saturationFilter];

    // Noise
    UIImage *noiseImage = [UIImage imageNamed:@"noise.png"];
    GPUImagePicture *noisePicture = [[GPUImagePicture alloc] initWithImage:noiseImage];
    GPUImageAddBlendFilter *blend = [GPUImageAddBlendFilter new];
    [blend useNextFrameForImageCapture];
    [filtersGroup addFilter:blend];
    [noisePicture addTarget:blend atTextureLocation:1];
    [noisePicture processImage];

    [saturationFilter addTarget:blend];

    filtersGroup.initialFilters = @[saturationFilter];
    filtersGroup.terminalFilter = blend;

    return filtersGroup;
}

---

---

    // Applying filter
    GPUImageOutput <GPUImageInput> *effect = [self myFilter];
    self._photoHandle = [[GPUImagePicture alloc] initWithImage:staticImage];
    [self._photoHandle addTarget:effect];
    [effect addTarget:self.targetPreviewView];
    [self._photoHandle processImage]; // Crash

当我尝试运行它时，应用程序崩溃并收到此消息:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Tried to overrelease a framebuffer, did you forget to call -useNextFrameForImageCapture before using -imageFromCurrentFramebuffer?'

我确实在混合滤镜上调用了“useNextFrameForImageCapture”，那么我的代码有什么问题吗？

Answer 1

啊，我找到了导致崩溃的原因。

请注意，我没有保留对 noisePicture 对象的任何强引用。替换:

GPUImagePicture *noisePicture

与

@property (nonatomic, strong) GPUImagePicture *noisePicture;
...
self.noisePicture = ...

解决了这个问题。感谢帮助! :)