77100a7578
There is a need to better control the order of operations an application performs on a camera for it to function correctly. Add a basic state machine to ensure applications perform operations on the camera in good order. Internal to the Camera states are added; Available, Acquired, Configured, Prepared and Running. Each state represents a higher state of configuration of the camera ultimately leading to the highest state where the camera is capturing frames. Each state supports a subset of operations the application may perform. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
88 lines
1.7 KiB
C++
88 lines
1.7 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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* camera.h - Camera object interface
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*/
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#ifndef __LIBCAMERA_CAMERA_H__
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#define __LIBCAMERA_CAMERA_H__
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#include <map>
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#include <memory>
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#include <set>
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#include <string>
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#include <libcamera/request.h>
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#include <libcamera/signal.h>
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namespace libcamera {
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class Buffer;
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class PipelineHandler;
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class Request;
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class Stream;
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class StreamConfiguration;
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class Camera final
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{
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public:
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static std::shared_ptr<Camera> create(PipelineHandler *pipe,
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const std::string &name,
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const std::set<Stream *> &streams);
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Camera(const Camera &) = delete;
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Camera &operator=(const Camera &) = delete;
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const std::string &name() const;
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Signal<Request *, const std::map<Stream *, Buffer *> &> requestCompleted;
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Signal<Camera *> disconnected;
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int acquire();
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int release();
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const std::set<Stream *> &streams() const;
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std::map<Stream *, StreamConfiguration>
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streamConfiguration(std::set<Stream *> &streams);
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int configureStreams(std::map<Stream *, StreamConfiguration> &config);
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int allocateBuffers();
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int freeBuffers();
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Request *createRequest();
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int queueRequest(Request *request);
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int start();
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int stop();
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private:
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enum State {
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CameraAvailable,
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CameraAcquired,
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CameraConfigured,
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CameraPrepared,
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CameraRunning,
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};
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Camera(PipelineHandler *pipe, const std::string &name);
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~Camera();
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bool stateBetween(State low, State high) const;
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bool stateIs(State state) const;
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friend class PipelineHandler;
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void disconnect();
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std::shared_ptr<PipelineHandler> pipe_;
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std::string name_;
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std::set<Stream *> streams_;
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std::set<Stream *> activeStreams_;
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bool disconnected_;
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State state_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_CAMERA_H__ */
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