/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2020, Google Inc. * * camera_worker.cpp - Process capture requests on behalf of the Camera HAL */ #include "camera_worker.h" #include <errno.h> #include <string.h> #include <sys/poll.h> #include "camera_device.h" using namespace libcamera; LOG_DECLARE_CATEGORY(HAL) /* * \class CaptureRequest * \brief Wrap a libcamera::Request associated with buffers and fences * * A CaptureRequest is constructed by the CameraDevice, filled with * buffers and fences provided by the camera3 framework and then processed * by the CameraWorker which queues it to the libcamera::Camera after handling * fences. */ CaptureRequest::CaptureRequest(libcamera::Camera *camera) : camera_(camera) { request_ = camera_->createRequest(reinterpret_cast<uint64_t>(this)); } void CaptureRequest::addBuffer(Stream *stream, FrameBuffer *buffer, int fence) { request_->addBuffer(stream, buffer); acquireFences_.push_back(fence); } void CaptureRequest::queue() { camera_->queueRequest(request_.get()); } /* * \class CameraWorker * \brief Process a CaptureRequest on an internal thread * * The CameraWorker class wraps a Worker that runs on an internal thread * and schedules processing of CaptureRequest through it. */ CameraWorker::CameraWorker() { worker_.moveToThread(&thread_); } void CameraWorker::start() { thread_.start(); } void CameraWorker::stop() { thread_.exit(); thread_.wait(); } void CameraWorker::queueRequest(CaptureRequest *request) { /* Async process the request on the worker which runs its own thread. */ worker_.invokeMethod(&Worker::processRequest, ConnectionTypeQueued, request); } /* * \class CameraWorker::Worker * \brief Process a CaptureRequest handling acquisition fences */ int CameraWorker::Worker::waitFence(int fence) { /* * \todo Better characterize the timeout. Currently equal to the one * used by the Rockchip Camera HAL on ChromeOS. */ constexpr unsigned int timeoutMs = 300; struct pollfd fds = { fence, POLLIN, 0 }; do { int ret = poll(&fds, 1, timeoutMs); if (ret == 0) return -ETIME; if (ret > 0) { if (fds.revents & (POLLERR | POLLNVAL)) return -EINVAL; return 0; } } while (errno == EINTR || errno == EAGAIN); return -errno; } void CameraWorker::Worker::processRequest(CaptureRequest *request) { /* Wait on all fences before queuing the Request. */ for (int fence : request->fences()) { if (fence == -1) continue; int ret = waitFence(fence); close(fence); if (ret < 0) { LOG(HAL, Error) << "Failed waiting for fence: " << fence << ": " << strerror(-ret); return; } } request->queue(); }