Android CameraServer答疑7：Request与Result流程

问题: Request 下发与 Result 返回的详细调用流程是什么？1. Request 下发流程 (App → HAL)App.submitRequestList() [Binder IPC] │ ▼ CameraDeviceClient::submitRequestList() (api2/CameraDeviceClient.cpp:403) ├── 验证请求, 构建 metadataRequestList ├── if streaming: mDevice-setStreamingRequestList() (line 731) └── if one-shot: mDevice-captureList() (line 755) │ ▼ Camera3Device::captureList() (device3/Camera3Device.cpp:913) ──▶ submitRequestsHelper(repeating=false) (line 863) │ ▼ Camera3Device::submitRequestsHelper() (line 863) ├── checkStatusOkToCaptureLocked() (line 875) ├── convertMetadataListToRequestListLocked() (line 780) │ ├── setUpRequestLocked() → createCaptureRequest() │ ├── 设置 burstId, requestId │ └── push 到 requestList ├── mRequestThread-queueRequestList() (line 893) └── waitUntilStateThenRelock(ACTIVE) (line 897) │ ▼ RequestThread::queueRequestList() (line 3329) ├── mRequestQueue.push_back() 入队 (line 3337) └── unpauseForNewRequests() (line 3347) │ ▼ RequestThread::threadLoop() (line 3913) [RequestThread 线程] ├── waitIfPaused() (line 3921) ├── waitForNextRequestBatch() (line 3926) │ ├── waitForNextRequestLocked() (line 4932) │ │ ├── 从 mRequestQueue 出队 (line 5002) │ │ └── mFrameNumber++ 赋值 (line 5033) │ └── 收集 HFR 批次 ├── 应用 overrides (test pattern, crop 等) (lines 3942-3955) ├── updateSessionParameters() / reconfigure (line 3962) ├── prepareHalRequests() (line 4001, 定义于 4079) │ ├── halRequest-frame_number = ... (line 4090) │ ├── insertTriggers() (line 4093) │ ├── metadata mappers (zoom, distortion 等) │ ├── getBuffer() 获取 output stream buffer (line 4415)