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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* uvcvideo.cpp - Pipeline handler for uvcvideo devices
*/
#include <libcamera/camera.h>
#include <libcamera/request.h>
#include <libcamera/stream.h>
#include "device_enumerator.h"
#include "log.h"
#include "media_device.h"
#include "pipeline_handler.h"
#include "utils.h"
#include "v4l2_device.h"
namespace libcamera {
LOG_DEFINE_CATEGORY(UVC)
class PipelineHandlerUVC : public PipelineHandler
{
public:
PipelineHandlerUVC(CameraManager *manager);
CameraConfiguration
generateConfiguration(Camera *camera,
const std::vector<StreamUsage> &usages) override;
int configure(Camera *camera,
const CameraConfiguration &config) override;
int allocateBuffers(Camera *camera,
const std::set<Stream *> &streams) override;
int freeBuffers(Camera *camera,
const std::set<Stream *> &streams) override;
int start(Camera *camera) override;
void stop(Camera *camera) override;
int queueRequest(Camera *camera, Request *request) override;
bool match(DeviceEnumerator *enumerator) override;
private:
class UVCCameraData : public CameraData
{
public:
UVCCameraData(PipelineHandler *pipe)
: CameraData(pipe), video_(nullptr)
{
}
~UVCCameraData()
{
delete video_;
}
void bufferReady(Buffer *buffer);
V4L2Device *video_;
Stream stream_;
};
UVCCameraData *cameraData(const Camera *camera)
{
return static_cast<UVCCameraData *>(
PipelineHandler::cameraData(camera));
}
};
PipelineHandlerUVC::PipelineHandlerUVC(CameraManager *manager)
: PipelineHandler(manager)
{
}
CameraConfiguration
PipelineHandlerUVC::generateConfiguration(Camera *camera,
const std::vector<StreamUsage> &usages)
{
UVCCameraData *data = cameraData(camera);
CameraConfiguration config;
StreamConfiguration cfg{};
cfg.pixelFormat = V4L2_PIX_FMT_YUYV;
cfg.size = { 640, 480 };
cfg.bufferCount = 4;
config[&data->stream_] = cfg;
return config;
}
int PipelineHandlerUVC::configure(Camera *camera,
const CameraConfiguration &config)
{
UVCCameraData *data = cameraData(camera);
const StreamConfiguration *cfg = &config[&data->stream_];
int ret;
V4L2DeviceFormat format = {};
format.fourcc = cfg->pixelFormat;
format.size = cfg->size;
ret = data->video_->setFormat(&format);
if (ret)
return ret;
if (format.size != cfg->size ||
format.fourcc != cfg->pixelFormat)
return -EINVAL;
return 0;
}
int PipelineHandlerUVC::allocateBuffers(Camera *camera,
const std::set<Stream *> &streams)
{
UVCCameraData *data = cameraData(camera);
Stream *stream = *streams.begin();
const StreamConfiguration &cfg = stream->configuration();
LOG(UVC, Debug) << "Requesting " << cfg.bufferCount << " buffers";
return data->video_->exportBuffers(&stream->bufferPool());
}
int PipelineHandlerUVC::freeBuffers(Camera *camera,
const std::set<Stream *> &streams)
{
UVCCameraData *data = cameraData(camera);
return data->video_->releaseBuffers();
}
int PipelineHandlerUVC::start(Camera *camera)
{
UVCCameraData *data = cameraData(camera);
return data->video_->streamOn();
}
void PipelineHandlerUVC::stop(Camera *camera)
{
UVCCameraData *data = cameraData(camera);
data->video_->streamOff();
PipelineHandler::stop(camera);
}
int PipelineHandlerUVC::queueRequest(Camera *camera, Request *request)
{
UVCCameraData *data = cameraData(camera);
Buffer *buffer = request->findBuffer(&data->stream_);
if (!buffer) {
LOG(UVC, Error)
<< "Attempt to queue request with invalid stream";
return -ENOENT;
}
int ret = data->video_->queueBuffer(buffer);
if (ret < 0)
return ret;
PipelineHandler::queueRequest(camera, request);
return 0;
}
bool PipelineHandlerUVC::match(DeviceEnumerator *enumerator)
{
MediaDevice *media;
DeviceMatch dm("uvcvideo");
media = acquireMediaDevice(enumerator, dm);
if (!media)
return false;
std::unique_ptr<UVCCameraData> data = utils::make_unique<UVCCameraData>(this);
/* Locate and open the default video node. */
for (MediaEntity *entity : media->entities()) {
if (entity->flags() & MEDIA_ENT_FL_DEFAULT) {
data->video_ = new V4L2Device(entity);
break;
}
}
if (!data->video_) {
LOG(UVC, Error) << "Could not find a default video device";
return false;
}
if (data->video_->open())
return false;
data->video_->bufferReady.connect(data.get(), &UVCCameraData::bufferReady);
/* Create and register the camera. */
std::set<Stream *> streams{ &data->stream_ };
std::shared_ptr<Camera> camera = Camera::create(this, media->model(), streams);
registerCamera(std::move(camera), std::move(data));
/* Enable hot-unplug notifications. */
hotplugMediaDevice(media);
return true;
}
void PipelineHandlerUVC::UVCCameraData::bufferReady(Buffer *buffer)
{
Request *request = queuedRequests_.front();
pipe_->completeBuffer(camera_, request, buffer);
pipe_->completeRequest(camera_, request);
}
REGISTER_PIPELINE_HANDLER(PipelineHandlerUVC);
} /* namespace libcamera */
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