/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2019, Google Inc. * * v4l2_camera.h - V4L2 compatibility camera */ #pragma once #include <deque> #include <utility> #include <libcamera/base/mutex.h> #include <libcamera/base/semaphore.h> #include <libcamera/base/shared_fd.h> #include <libcamera/camera.h> #include <libcamera/framebuffer.h> #include <libcamera/framebuffer_allocator.h> class V4L2Camera { public: struct Buffer { Buffer(unsigned int index, const libcamera::FrameMetadata &data) : index_(index), data_(data) { } unsigned int index_; libcamera::FrameMetadata data_; }; V4L2Camera(std::shared_ptr<libcamera::Camera> camera); ~V4L2Camera(); int open(libcamera::StreamConfiguration *streamConfig); void close(); void bind(int efd); void unbind(); std::vector<Buffer> completedBuffers(); int configure(libcamera::StreamConfiguration *streamConfigOut, const libcamera::Size &size, const libcamera::PixelFormat &pixelformat, unsigned int bufferCount); int validateConfiguration(const libcamera::PixelFormat &pixelformat, const libcamera::Size &size, libcamera::StreamConfiguration *streamConfigOut); int allocBuffers(unsigned int count); void freeBuffers(); int getBufferFd(unsigned int index); int streamOn(); int streamOff(); int qbuf(unsigned int index); void waitForBufferAvailable(); bool isBufferAvailable(); bool isRunning(); private: void requestComplete(libcamera::Request *request); std::shared_ptr<libcamera::Camera> camera_; std::unique_ptr<libcamera::CameraConfiguration> config_; bool isRunning_; libcamera::Mutex bufferLock_; libcamera::FrameBufferAllocator *bufferAllocator_; std::vector<std::unique_ptr<libcamera::Request>> requestPool_; std::deque<libcamera::Request *> pendingRequests_; std::deque<std::unique_ptr<Buffer>> completedBuffers_; int efd_; libcamera::Mutex bufferMutex_; libcamera::ConditionVariable bufferCV_; unsigned int bufferAvailableCount_; };