initial commit, 4.5 stable

modules/camera/camera_feed_linux.h

@@ -0,0 +1,77 @@
+/**************************************************************************/
+/*  camera_feed_linux.h                                                   */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "buffer_decoder.h"
+
+#include "core/os/thread.h"
+#include "servers/camera/camera_feed.h"
+
+#include <linux/videodev2.h>
+
+struct StreamingBuffer;
+
+class CameraFeedLinux : public CameraFeed {
+	GDSOFTCLASS(CameraFeedLinux, CameraFeed);
+
+private:
+	SafeFlag exit_flag;
+	Thread *thread = nullptr;
+	String device_name;
+	int file_descriptor = -1;
+	StreamingBuffer *buffers = nullptr;
+	unsigned int buffer_count = 0;
+	BufferDecoder *buffer_decoder = nullptr;
+
+	static void update_buffer_thread_func(void *p_func);
+
+	void _update_buffer();
+	void _query_device(const String &p_device_name);
+	void _add_format(v4l2_fmtdesc description, v4l2_frmsize_discrete size, int frame_numerator, int frame_denominator);
+	bool _request_buffers();
+	bool _start_capturing();
+	void _read_frame();
+	void _stop_capturing();
+	void _unmap_buffers(unsigned int p_count);
+	BufferDecoder *_create_buffer_decoder();
+	void _start_thread();
+
+public:
+	String get_device_name() const;
+	bool activate_feed() override;
+	void deactivate_feed() override;
+	bool set_format(int p_index, const Dictionary &p_parameters) override;
+	Array get_formats() const override;
+	FeedFormat get_format() const override;
+
+	CameraFeedLinux(const String &p_device_name);
+	~CameraFeedLinux() override;
+};