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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera.cpp - V4L2 compatibility camera
*/
#include "v4l2_camera.h"
#include <errno.h>
#include "log.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(V4L2Compat);
V4L2Camera::V4L2Camera(std::shared_ptr<Camera> camera)
: camera_(camera), isRunning_(false), bufferAllocator_(nullptr)
{
camera_->requestCompleted.connect(this, &V4L2Camera::requestComplete);
}
V4L2Camera::~V4L2Camera()
{
close();
}
int V4L2Camera::open()
{
/* \todo Support multiple open. */
if (camera_->acquire() < 0) {
LOG(V4L2Compat, Error) << "Failed to acquire camera";
return -EINVAL;
}
config_ = camera_->generateConfiguration({ StreamRole::Viewfinder });
if (!config_) {
camera_->release();
return -EINVAL;
}
bufferAllocator_ = FrameBufferAllocator::create(camera_);
return 0;
}
void V4L2Camera::close()
{
delete bufferAllocator_;
bufferAllocator_ = nullptr;
camera_->release();
}
void V4L2Camera::getStreamConfig(StreamConfiguration *streamConfig)
{
*streamConfig = config_->at(0);
}
std::vector<V4L2Camera::Buffer> V4L2Camera::completedBuffers()
{
std::vector<Buffer> v;
bufferLock_.lock();
for (std::unique_ptr<Buffer> &metadata : completedBuffers_)
v.push_back(*metadata.get());
completedBuffers_.clear();
bufferLock_.unlock();
return v;
}
void V4L2Camera::requestComplete(Request *request)
{
if (request->status() == Request::RequestCancelled)
return;
/* We only have one stream at the moment. */
bufferLock_.lock();
FrameBuffer *buffer = request->buffers().begin()->second;
std::unique_ptr<Buffer> metadata =
std::make_unique<Buffer>(request->cookie(), buffer->metadata());
completedBuffers_.push_back(std::move(metadata));
bufferLock_.unlock();
bufferSema_.release();
}
int V4L2Camera::configure(StreamConfiguration *streamConfigOut,
const Size &size, PixelFormat pixelformat,
unsigned int bufferCount)
{
StreamConfiguration &streamConfig = config_->at(0);
streamConfig.size.width = size.width;
streamConfig.size.height = size.height;
streamConfig.pixelFormat = pixelformat;
streamConfig.bufferCount = bufferCount;
/* \todo memoryType (interval vs external) */
CameraConfiguration::Status validation = config_->validate();
if (validation == CameraConfiguration::Invalid) {
LOG(V4L2Compat, Debug) << "Configuration invalid";
return -EINVAL;
}
if (validation == CameraConfiguration::Adjusted)
LOG(V4L2Compat, Debug) << "Configuration adjusted";
LOG(V4L2Compat, Debug) << "Validated configuration is: "
<< streamConfig.toString();
int ret = camera_->configure(config_.get());
if (ret < 0)
return ret;
*streamConfigOut = config_->at(0);
return 0;
}
int V4L2Camera::allocBuffers(unsigned int count)
{
Stream *stream = *camera_->streams().begin();
return bufferAllocator_->allocate(stream);
}
void V4L2Camera::freeBuffers()
{
Stream *stream = *camera_->streams().begin();
bufferAllocator_->free(stream);
}
FileDescriptor V4L2Camera::getBufferFd(unsigned int index)
{
Stream *stream = *camera_->streams().begin();
const std::vector<std::unique_ptr<FrameBuffer>> &buffers =
bufferAllocator_->buffers(stream);
if (buffers.size() <= index)
return FileDescriptor();
return buffers[index]->planes()[0].fd;
}
int V4L2Camera::streamOn()
{
if (isRunning_)
return 0;
int ret = camera_->start();
if (ret < 0)
return ret == -EACCES ? -EBUSY : ret;
isRunning_ = true;
for (std::unique_ptr<Request> &req : pendingRequests_) {
/* \todo What should we do if this returns -EINVAL? */
ret = camera_->queueRequest(req.release());
if (ret < 0)
return ret == -EACCES ? -EBUSY : ret;
}
pendingRequests_.clear();
return 0;
}
int V4L2Camera::streamOff()
{
/* \todo Restore buffers to reqbufs state? */
if (!isRunning_)
return 0;
int ret = camera_->stop();
if (ret < 0)
return ret == -EACCES ? -EBUSY : ret;
isRunning_ = false;
return 0;
}
int V4L2Camera::qbuf(unsigned int index)
{
std::unique_ptr<Request> request =
std::unique_ptr<Request>(camera_->createRequest(index));
if (!request) {
LOG(V4L2Compat, Error) << "Can't create request";
return -ENOMEM;
}
Stream *stream = config_->at(0).stream();
FrameBuffer *buffer = bufferAllocator_->buffers(stream)[index].get();
int ret = request->addBuffer(stream, buffer);
if (ret < 0) {
LOG(V4L2Compat, Error) << "Can't set buffer for request";
return -ENOMEM;
}
if (!isRunning_) {
pendingRequests_.push_back(std::move(request));
return 0;
}
ret = camera_->queueRequest(request.release());
if (ret < 0) {
LOG(V4L2Compat, Error) << "Can't queue request";
return ret == -EACCES ? -EBUSY : ret;
}
return 0;
}
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