frame: vrlink: decoder worker stops on `EAGAIN` and takes a second to restart
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评估
- 难度
- 4/5
- 预计耗时
- 一周以上
- 新手友好度
- 12/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- linux
调研方向
The payload names SVLCodecV4L2::MediaThread, SVLCodecV4L2::CheckStuck, SoftReset and HardReset, and the VIDIOC_DQBUF call that returns EAGAIN. This repository is a community tracker, so the source for these is not in it, and the payload does not show where to start reading. The issue asks for no specific change, so a first step would be confirming with maintainers where the code lives and whether a reproduction exists before any edit.
由索引模型根据 Issue 内容生成。
描述
This seems to happen shortly after the headset issues a stream reset, so I think there's a race between decoder reset and the decoder worker dequeueing the output buffer. Here's a log of one such event:
19:12:55.502540 Received frame outside of backtrack window. Resetting.
19:12:55.503863 SVLCodecV4L2::MediaThread: Failed to dequeue output buffer. -1 [11 Resource temporarily unavailable]
19:12:55.880790 SVLCodecV4L2::CheckStuck: > 300ms between our last forward progress. Asking remote side for a new IFrame
...
19:12:56.556407 SVLCodecV4L2::CheckStuck: > 800ms between our last forward progress. Reset.
19:12:56.556424 SVLCodecV4L2::SoftReset: Doing a hard reset.
19:12:56.556437 SVLCodecV4L2::HardReset: Called!
What happens is SVLCodecV4L2::MediaThread gets an EAGAIN on VIDIOC_DQBUF, indicating that there's nothing to dequeue. At which point it exits...
This completely stops frame decoding, the watchdog (SVLCodecV4L2::CheckStuck) notices something went wrong after 300ms (so about 300 years in frame time) and issues another stream reset. Then it waits some more time before deciding to restart the decoder (and issue yet another reset).
So, all in all, a reset can trigger a 1 second freeze.
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