/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2019, Google Inc. * * v4l2_camera.h - V4L2 compatibility camera */ #ifndef __V4L2_CAMERA_H__ #define __V4L2_CAMERA_H__ #include <deque> #include <mutex> #include <utility> #include <libcamera/buffer.h> #include <libcamera/camera.h> #include <libcamera/file_descriptor.h> #include <libcamera/framebuffer_allocator.h> #include "libcamera/internal/semaphore.h" using namespace libcamera; class V4L2Camera { public: struct Buffer { Buffer(unsigned int index, const FrameMetadata &data) : index_(index), data_(data) { } unsigned int index_; FrameMetadata data_; }; V4L2Camera(std::shared_ptr<Camera> camera); ~V4L2Camera(); int open(StreamConfiguration *streamConfig); void close(); void bind(int efd); void unbind(); std::vector<Buffer> completedBuffers(); int configure(StreamConfiguration *streamConfigOut, const Size &size, const PixelFormat &pixelformat, unsigned int bufferCount); int validateConfiguration(const PixelFormat &pixelformat, const Size &size, StreamConfiguration *streamConfigOut); int allocBuffers(unsigned int count); void freeBuffers(); FileDescriptor getBufferFd(unsigned int index); int streamOn(); int streamOff(); int qbuf(unsigned int index); void waitForBufferAvailable(); bool isBufferAvailable(); bool isRunning(); private: void requestComplete(Request *request); std::shared_ptr<Camera> camera_; std::unique_ptr<CameraConfiguration> config_; bool isRunning_; std::mutex bufferLock_; FrameBufferAllocator *bufferAllocator_; std::vector<std::unique_ptr<Request>> requestPool_; std::deque<Request *> pendingRequests_; std::deque<std::unique_ptr<Buffer>> completedBuffers_; int efd_; Mutex bufferMutex_; std::condition_variable bufferCV_; unsigned int bufferAvailableCount_; }; #endif /* __V4L2_CAMERA_H__ */