[libcamera-devel] [PATCH 04/12] libcamera: deviceenumerator: add DeviceMatch class

[Niklas Söderlund]

Provide a DeviceMatch class which represents all properties of a media
device a pipeline hander can specify when searching for a device to use
in its pipeline.

Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
 src/libcamera/deviceenumerator.cpp       | 54 ++++++++++++++++++++++++
 src/libcamera/include/deviceenumerator.h | 17 ++++++++
 2 files changed, 71 insertions(+)

diff --git a/src/libcamera/deviceenumerator.cpp b/src/libcamera/deviceenumerator.cpp
index 7c44a65b45472ef3..17b6874d229c791c 100644
--- a/src/libcamera/deviceenumerator.cpp
+++ b/src/libcamera/deviceenumerator.cpp
@@ -75,4 +75,58 @@ bool DeviceInfo::lookup(const std::string &name, std::string &devnode) const
 	return true;
 }
 
+/* -----------------------------------------------------------------------------
+ * DeviceMatch
+ */
+
+DeviceMatch::DeviceMatch(const std::string &driver)
+	: driver_(driver)
+{
+}
+
+void DeviceMatch::add(const std::string &entity)
+{
+	entities_.push_back(std::string(entity));
+}
+
+bool DeviceMatch::match(const DeviceInfo *info) const
+{
+	std::vector<std::string> entities;
+
+	if (!matchInfo(info->info()))
+		return false;
+
+	if (!matchEntities(info->entities()))
+		return false;
+
+	return true;
+}
+
+bool DeviceMatch::matchInfo(const struct media_device_info &info) const
+{
+	/* TODO: Add more optinal matching pairs from struct media_device_info */
+	/* TODO: Allow for empty driver in DeviceMatch */
+	return driver_ == info.driver;
+}
+
+bool DeviceMatch::matchEntities(const std::vector<std::string> &entities) const
+{
+	for (const std::string &name : entities_) {
+		bool found = false;
+
+		for (const std::string &entity : entities) {
+
+			if (name == entity) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+			return false;
+	}
+
+	return true;
+}
+
 } /* namespace libcamera */
diff --git a/src/libcamera/include/deviceenumerator.h b/src/libcamera/include/deviceenumerator.h
index 0136ed6ea23bf65e..fb412b8840cb2ffe 100644
--- a/src/libcamera/include/deviceenumerator.h
+++ b/src/libcamera/include/deviceenumerator.h
@@ -39,6 +39,23 @@ private:
 	std::map<std::string, std::string> entities_;
 };
 
+class DeviceMatch
+{
+public:
+	DeviceMatch(const std::string &driver);
+
+	void add(const std::string &entity);
+
+	bool match(const DeviceInfo *info) const;
+
+private:
+	std::string driver_;
+	std::vector<std::string> entities_;
+
+	bool matchInfo(const struct media_device_info &info) const;
+	bool matchEntities(const std::vector<std::string> &entities) const;
+};
+
 } /* namespace libcamera */
 
 #endif	/* __LIBCAMERA_DEVICEENUMERATE_H__ */
-- 
2.20.1