使用混合滤镜时GPUImage崩溃(“释放帧缓冲区") [英] GPUImage crash ('over release framebuffer') when using Blend Filter

问题描述

由于尝试将Blend滤镜应用于图像并显示它时发生的崩溃，我感到头疼. 我想要做的就是简单地将覆盖图像放置到另一幅图像上.

I'm getting a headache because of the crash I experience when trying to apply Blend filter to an image and displaying it. What I want to do is simply put an overlay image onto another image.

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，并显示以下消息:

When I try to run it, app crashes and I get this message:

由于未捕获的异常而终止应用程序 "NSInternalInconsistencyException"，原因:试图过分释放 帧缓冲区，您是否忘了调用-useNextFrameForImageCapture 在使用-imageFromCurrentFramebuffer之前?'

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"，所以我的代码出了什么问题?

I do call 'useNextFrameForImageCapture' on blend filter so what's wrong with my code?

推荐答案

啊，我发现了导致崩溃的原因.

Argh, I found out what caused the crash.

请注意，我没有对noisePicture对象做任何强引用. 替换:

Notice that I don't keep any strong reference to the noisePicture object. Replacing:

GPUImagePicture *noisePicture

使用

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

解决了该问题.感谢帮助！ :)

fixed the issue. Thanks for help! :)

这篇关于使用混合滤镜时GPUImage崩溃(“释放帧缓冲区")的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！