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authorPaul Elder <paul.elder@ideasonboard.com>2021-09-08 16:48:58 +0900
committerPaul Elder <paul.elder@ideasonboard.com>2021-09-10 10:32:57 +0900
commit9f9c224c7bb91e0123b75901a7ccf54d1226504d (patch)
tree6f33ee61438b503bb2d4fabc268677b628fba333
parentba155eadb9b5e0976338c75aa21d95275f7c649c (diff)
libcamera: v4l2_pixelformat: Add helper function to get the description
Add a helper function to V4L2PixelFormat for retrieving the V4L2 description string. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
-rw-r--r--include/libcamera/internal/v4l2_pixelformat.h1
-rw-r--r--src/libcamera/v4l2_pixelformat.cpp22
2 files changed, 23 insertions, 0 deletions
diff --git a/include/libcamera/internal/v4l2_pixelformat.h b/include/libcamera/internal/v4l2_pixelformat.h
index 87872542..e3cda699 100644
--- a/include/libcamera/internal/v4l2_pixelformat.h
+++ b/include/libcamera/internal/v4l2_pixelformat.h
@@ -40,6 +40,7 @@ public:
operator uint32_t() const { return fourcc_; }
std::string toString() const;
+ const char *description() const;
PixelFormat toPixelFormat() const;
static V4L2PixelFormat fromPixelFormat(const PixelFormat &pixelFormat,
diff --git a/src/libcamera/v4l2_pixelformat.cpp b/src/libcamera/v4l2_pixelformat.cpp
index 2c8167a7..3649c600 100644
--- a/src/libcamera/v4l2_pixelformat.cpp
+++ b/src/libcamera/v4l2_pixelformat.cpp
@@ -251,6 +251,28 @@ std::string V4L2PixelFormat::toString() const
}
/**
+ * \brief Retrieve the V4L2 description for the format
+ *
+ * The description matches the value used by the kernel, as would be reported
+ * by the VIDIOC_ENUM_FMT ioctl.
+ *
+ * \return The V4L2 description corresponding to the V4L2 format, or a
+ * placeholder description if not found
+ */
+const char *V4L2PixelFormat::description() const
+{
+ const auto iter = vpf2pf.find(*this);
+ if (iter == vpf2pf.end()) {
+ LOG(V4L2, Warning)
+ << "Unsupported V4L2 pixel format "
+ << toString();
+ return "Unsupported format";
+ }
+
+ return iter->second.description;
+}
+
+/**
* \brief Convert the V4L2 pixel format to the corresponding PixelFormat
* \return The PixelFormat corresponding to the V4L2 pixel format
*/