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/* 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, uint64_t cookie)
: camera_(camera)
{
request_ = camera_->createRequest(cookie);
}
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();
}
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