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libcamera: v4l2_pixelformat: Add helper function to get the description

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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>
This commit is contained in:
Paul Elder 2021-09-08 16:48:58 +09:00
parent ba155eadb9
commit 9f9c224c7b
2 changed files with 23 additions and 0 deletions
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1
include/libcamera/internal/v4l2_pixelformat.h
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@ -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,

22
src/libcamera/v4l2_pixelformat.cpp
View file

@ -250,6 +250,28 @@ 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, 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