[libcamera-devel] [PATCH v3 4/7] libcamera: v4l2_pixelformat: Add helper function to get the description
Paul Elder
paul.elder at ideasonboard.com
Thu Sep 9 10:08:59 CEST 2021
Add a helper function to V4L2PixelFormat for retrieving the V4L2
description string.
Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
include/libcamera/internal/v4l2_pixelformat.h | 1 +
src/libcamera/v4l2_pixelformat.cpp | 21 +++++++++++++++++++
2 files changed, 22 insertions(+)
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..fed31238 100644
--- a/src/libcamera/v4l2_pixelformat.cpp
+++ b/src/libcamera/v4l2_pixelformat.cpp
@@ -250,6 +250,27 @@ std::string V4L2PixelFormat::toString() const
return ss;
}
+/**
+ * \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
+ */
+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
--
2.27.0
More information about the libcamera-devel
mailing list