libcamera: Add V4L2Subdevice

Add V4L2Subdevice class that provides an interface to interact with V4L2 defined sub-devices. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-01-29 15:16:22 +01:00
parent 8dbc203bb2
commit 468176fa07
3 changed files with 317 additions and 0 deletions
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * v4l2_subdevice.h - V4L2 Subdevice
+ */
+#ifndef __LIBCAMERA_V4L2_SUBDEVICE_H__
+#define __LIBCAMERA_V4L2_SUBDEVICE_H__
+
+#include <string>
+
+namespace libcamera {
+
+struct Rectangle;
+
+struct V4L2SubdeviceFormat {
+	uint32_t mbus_code;
+	uint32_t width;
+	uint32_t height;
+};
+
+class V4L2Subdevice
+{
+public:
+	explicit V4L2Subdevice(const MediaEntity *entity);
+	V4L2Subdevice(const V4L2Subdevice &) = delete;
+	V4L2Subdevice &operator=(const V4L2Subdevice &) = delete;
+
+	int open();
+	bool isOpen() const;
+	void close();
+
+	std::string deviceNode() const { return deviceNode_; }
+
+	int setCrop(unsigned int pad, Rectangle *rect);
+	int setCompose(unsigned int pad, Rectangle *rect);
+
+	int getFormat(unsigned int pad, V4L2SubdeviceFormat *format);
+	int setFormat(unsigned int pad, V4L2SubdeviceFormat *format);
+
+private:
+	int setSelection(unsigned int pad, unsigned int target,
+			 Rectangle *rect);
+
+	std::string deviceNode_;
+	int fd_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_V4L2_SUBDEVICE_H__ */