cdc2620549
The V4L2 requests API provides support to atomically tie controls to a set of buffers. This is especially common for m2m devices. Such a request is represented by an fd that is allocated via MEDIA_IOC_REQUEST_ALLOC and then passed to the various V4L2 functions. Implement a V4L2Request class to wrap such an fd and add the corresponding utility functions. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2018, Google Inc.
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*
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* Media device handler
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*/
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#pragma once
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#include <map>
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#include <optional>
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#include <string>
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#include <vector>
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#include <linux/media.h>
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#include <libcamera/base/log.h>
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#include <libcamera/base/signal.h>
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#include <libcamera/base/unique_fd.h>
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#include "libcamera/internal/media_object.h"
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#include "libcamera/internal/v4l2_request.h"
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namespace libcamera {
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class MediaDevice : protected Loggable
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{
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public:
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MediaDevice(const std::string &deviceNode);
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~MediaDevice();
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bool acquire();
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void release();
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bool busy() const { return acquired_; }
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bool lock();
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void unlock();
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int populate();
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bool isValid() const { return valid_; }
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const std::string &driver() const { return driver_; }
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const std::string &deviceNode() const { return deviceNode_; }
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const std::string &model() const { return model_; }
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unsigned int version() const { return version_; }
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unsigned int hwRevision() const { return hwRevision_; }
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const std::vector<MediaEntity *> &entities() const { return entities_; }
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MediaEntity *getEntityByName(const std::string &name) const;
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MediaLink *link(const std::string &sourceName, unsigned int sourceIdx,
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const std::string &sinkName, unsigned int sinkIdx);
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MediaLink *link(const MediaEntity *source, unsigned int sourceIdx,
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const MediaEntity *sink, unsigned int sinkIdx);
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MediaLink *link(const MediaPad *source, const MediaPad *sink);
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int disableLinks();
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Signal<> disconnected;
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std::vector<MediaEntity *> locateEntities(unsigned int function);
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int allocateRequests(unsigned int count,
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std::vector<std::unique_ptr<V4L2Request>> *requests);
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bool supportsRequests();
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protected:
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std::string logPrefix() const override;
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private:
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int open();
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void close();
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MediaObject *object(unsigned int id);
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bool addObject(MediaObject *object);
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void clear();
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struct media_v2_interface *findInterface(const struct media_v2_topology &topology,
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unsigned int entityId);
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bool populateEntities(const struct media_v2_topology &topology);
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bool populatePads(const struct media_v2_topology &topology);
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bool populateLinks(const struct media_v2_topology &topology);
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void fixupEntityFlags(struct media_v2_entity *entity);
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friend int MediaLink::setEnabled(bool enable);
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int setupLink(const MediaLink *link, unsigned int flags);
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std::string driver_;
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std::string deviceNode_;
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std::string model_;
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unsigned int version_;
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unsigned int hwRevision_;
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UniqueFD fd_;
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bool valid_;
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bool acquired_;
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std::optional<bool> supportsRequests_;
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std::map<unsigned int, MediaObject *> objects_;
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std::vector<MediaEntity *> entities_;
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};
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} /* namespace libcamera */
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