[UWP] [C＃] MediaPlaybackList内存泄漏 [英] [UWP][C#] MediaPlaybackList memory leak
问题描述
嘿，
前一段时间我有这个奇怪的问题，经过一段时间后我的后台任务就会因为没有足够的内存继续而退出。
我想我现在发现了这个问题。
先来一点点细节：
我正在使用一个实现的自定义类IRandomAccessStreamReference接口。
使用这个类我创建MediaSources然后我将其包装在MediaPlaybackItem中并添加到MediaPlaybackList。
当调用OpenReadAsync（）时，我调用异步任务实际打开文件和流并返回它的方法。
我施放了任务<>使用AsAsyncOperation（）进行AsyncOperation并返回它。
所以现在问题出现了：
当浏览播放列表时（出于速度原因，我只是一直移动到下一个并且没有等待每个音轨结束）我注意到内存使用量不断上升。
每个音轨只有1-4 MB但是这一切都加起来直到达到内存限制。我可以设置一个更高的限制（尝试直到100 MB，在1 GB内存的lumia 650上仍然成功）但这显然不是一个可行的解决方案。
我解决了一个小问题：
在CurrentItemChanged处理程序中，我只需重置OldItem的MediaSource Source（如果它不为null）。
这样内存保持相对常数+/- 2MB
所以我想知道我做错了什么（并且让MediaPlaybackList无法自行释放内存）或者是否存在MediaPlaybackList中的错误？
a while ago I had this weird issue that after some time my background task would just quit because he had insufficient memory to continue.
I think I found the issue now.
First a little bit of detail:
I am using a custom class that implements the IRandomAccessStreamReference interface.
Using this class I create MediaSources which I then wrap in a MediaPlaybackItem and add to a MediaPlaybackList.
When OpenReadAsync() is called I call an async Task method that actually opens the file and the stream and returns it.
I cast the Task<> to AsyncOperation with AsAsyncOperation() and return it.
So now here's the problem:
When going through the playlist (for speed reasons i just moved to the next one all the time and didn't wait for each track to end) I noticed that the memory usage is constantly rising.
Just 1-4 MB per track but it all adds up until the memory limit is reached. I can set a higher limit (did try until 100 MB which was still successful on a lumia 650 with 1 GB RAM) but that's obviously not a viable solution.
I worked out a little workaround:
In the CurrentItemChanged handler I simply Reset the MediaSource Source of the OldItem (if it isn't null).
That way the memory remains relatively constant +/- 2MB
So I'm wondering did I do something wrong (and made it impossible for the MediaPlaybackList to free the memory by itself) or is there a bug in the MediaPlaybackList?
推荐答案
Hello St3f4n，
Hello St3f4n,
要知道这是否是一个已知问题，我们需要重现您的问题。你介意发一个简单的重复样本吗？
To know whether this is a known issue we need to reproduce your problem. Would you mind to send a simple repro sample?
请确保你已经取消了一些可能的资源，如下所述：
And please make sure you've canceled some possible resource like described here:
https://blogs.windows.com/buildingapps/2016/01/13/ the-baseics-of-background-audio /
请参阅此处的取消回拨。
See Cancellation Callback here.
祝你好运，
Barry
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