eb4030f6c0
The FrameBuffer interface is based on the idea that all buffers are allocated externally to libcamera and are only used by it. This is meant to create a simpler API centered around usage of buffers, regardless of where they come from. Linux however lacks a centralized allocator at the moment, and not all users of libcamera are expected to use another device that could provide suitable buffers for the camera. This patch thus adds a helper class to allocate buffers internally in libcamera, in a way that matches the needs of the FrameBuffer-based API. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
139 lines
2.9 KiB
C++
139 lines
2.9 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 <memory>
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#include <set>
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#include <stdint.h>
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#include <string>
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#include <libcamera/controls.h>
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#include <libcamera/request.h>
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#include <libcamera/signal.h>
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#include <libcamera/stream.h>
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namespace libcamera {
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class Buffer;
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class FrameBufferAllocator;
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class PipelineHandler;
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class Request;
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class CameraConfiguration
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{
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public:
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enum Status {
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Valid,
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Adjusted,
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Invalid,
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};
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using iterator = std::vector<StreamConfiguration>::iterator;
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using const_iterator = std::vector<StreamConfiguration>::const_iterator;
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virtual ~CameraConfiguration();
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void addConfiguration(const StreamConfiguration &cfg);
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virtual Status validate() = 0;
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StreamConfiguration &at(unsigned int index);
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const StreamConfiguration &at(unsigned int index) const;
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StreamConfiguration &operator[](unsigned int index)
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{
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return at(index);
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}
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const StreamConfiguration &operator[](unsigned int index) const
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{
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return at(index);
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}
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iterator begin();
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const_iterator begin() const;
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iterator end();
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const_iterator end() const;
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bool empty() const;
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std::size_t size() const;
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protected:
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CameraConfiguration();
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std::vector<StreamConfiguration> config_;
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};
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class Camera final : public std::enable_shared_from_this<Camera>
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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 *, Buffer *> bufferCompleted;
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Signal<Request *> 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 ControlInfoMap &controls();
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const std::set<Stream *> &streams() const;
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std::unique_ptr<CameraConfiguration> generateConfiguration(const StreamRoles &roles);
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int configure(CameraConfiguration *config);
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int allocateBuffers();
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int freeBuffers();
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Request *createRequest(uint64_t cookie = 0);
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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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void requestComplete(Request *request);
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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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/* Needed to update allocator_ and to read state_ and activeStreams_. */
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friend class FrameBufferAllocator;
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FrameBufferAllocator *allocator_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_CAMERA_H__ */
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