@@ -24,4 +24,92 @@ namespace libcamera {
* resolutions represented by SizeRange items.
*/
+/**
+ * \class ImageFormats
+ * \brief Describe V4L2Device and V4L2SubDevice image formats
+ *
+ * This class stores a list of image formats, each associated with a
+ * corresponding set of image sizes. It is used to describe the formats and
+ * sizes supported by a V4L2Device or V4L2Subdevice.
+ *
+ * Formats are stored as an integer. When used for a V4L2Device, the image
+ * formats are fourcc pixel formats. When used for a V4L2Subdevice they are
+ * media bus codes. Both are defined by the V4L2 specification.
+ *
+ * Sizes are stored as a list of SizeRange.
+ */
+
+/**
+ * \brief Add a format and corresponding sizes to the description
+ * \param[in] format Pixel format or media bus code to describe
+ * \param[in] sizes List of supported size ranges for the format
+ *
+ * \return 0 on success or a negative error code otherwise
+ * \retval -EEXIST The format is already described
+ */
+int ImageFormats::addFormat(unsigned int format, const std::vector<SizeRange> &sizes)
+{
+ if (data_.find(format) != data_.end())
+ return -EEXIST;
+
+ data_[format] = sizes;
+
+ return 0;
+}
+
+/**
+ * \brief Check if the list of devices supported formats is empty
+ * \return True if the list of supported formats is empty
+ */
+bool ImageFormats::isEmpty() const
+{
+ return data_.empty();
+}
+
+/**
+ * \brief Retrieve a list of all supported image formats
+ * \return List of pixel formats or media bus codes
+ */
+std::vector<unsigned int> ImageFormats::formats() const
+{
+ std::vector<unsigned int> formats;
+ formats.reserve(data_.size());
+
+ /* \todo: Should this be cached instead of computed each time? */
+ for (auto const &it : data_)
+ formats.push_back(it.first);
+
+ return formats;
+}
+
+/**
+ * \brief Retrieve all sizes for a specific format
+ * \param[in] format The pixel format or mbus code
+ *
+ * Retrieve all size ranges for a specific format. For V4L2Device \a format is a
+ * pixel format while for a V4L2Subdevice \a format is a media bus code.
+ *
+ * \return The list of image sizes supported for \a format, or an empty list if
+ * the format is not supported
+ */
+const std::vector<SizeRange> &ImageFormats::sizes(unsigned int format) const
+{
+ static std::vector<SizeRange> empty;
+
+ auto const &it = data_.find(format);
+ if (it == data_.end())
+ return empty;
+
+ return it->second;
+}
+
+/**
+ * \brief Retrieve the map that associates formats to image sizes
+ * \return The map that associates formats to image sizes
+ */
+const std::map<unsigned int, std::vector<SizeRange>> &ImageFormats::data() const
+{
+ return data_;
+}
+
} /* namespace libcamera */
@@ -17,6 +17,20 @@ namespace libcamera {
typedef std::map<unsigned int, std::vector<SizeRange>> FormatEnum;
+class ImageFormats
+{
+public:
+ int addFormat(unsigned int format, const std::vector<SizeRange> &sizes);
+
+ bool isEmpty() const;
+ std::vector<unsigned int> formats() const;
+ const std::vector<SizeRange> &sizes(unsigned int format) const;
+ const std::map<unsigned int, std::vector<SizeRange>> &data() const;
+
+private:
+ std::map<unsigned int, std::vector<SizeRange>> data_;
+};
+
} /* namespace libcamera */
#endif /* __LIBCAMERA_FORMATS_H__ */