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libcamera: video_device: Support passing ColorSpaces to V4L2 video devices

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The ColorSpace from the StreamConfiguration is now handled
appropriately in the V4L2VideoDevice.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
David Plowman 2021-12-10 14:44:20 +00:00 • committed by Laurent Pinchart
parent e86aed6166
commit 3e520cadf1
2 changed files with 25 additions and 0 deletions
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3
include/libcamera/internal/v4l2_videodevice.h
View file

@ -10,6 +10,7 @@
#include <array>
#include <atomic>
#include <memory>
#include <optional>
#include <stdint.h>
#include <string>
#include <vector>
@ -21,6 +22,7 @@
#include <libcamera/base/signal.h>
#include <libcamera/base/unique_fd.h>
#include <libcamera/color_space.h>
#include <libcamera/framebuffer.h>
#include <libcamera/geometry.h>
#include <libcamera/pixel_format.h>
@ -167,6 +169,7 @@ public:
V4L2PixelFormat fourcc;
Size size;
std::optional<ColorSpace> colorSpace;
std::array<Plane, 3> planes;
unsigned int planesCount = 0;

22
src/libcamera/v4l2_videodevice.cpp
View file

@ -383,6 +383,21 @@ bool V4L2BufferCache::Entry::operator==(const FrameBuffer &buffer) const
* that identifies the image format pixel encoding scheme.
*/
/**
* \var V4L2DeviceFormat::colorSpace
* \brief The color space of the pixels
*
* The color space of the image. When setting the format this may be
* unset, in which case the driver gets to use its default color space.
* After being set, this value should contain the color space that
* was actually used. If this value is unset, then the color space chosen
* by the driver could not be represented by the ColorSpace class (and
* should probably be added).
*
* It is up to the pipeline handler or application to check if the
* resulting color space is acceptable.
*/
/**
* \var V4L2DeviceFormat::planes
* \brief The per-plane memory size information
@ -871,6 +886,7 @@ int V4L2VideoDevice::getFormatMultiplane(V4L2DeviceFormat *format)
format->size.height = pix->height;
format->fourcc = V4L2PixelFormat(pix->pixelformat);
format->planesCount = pix->num_planes;
format->colorSpace = toColorSpace(*pix);
for (unsigned int i = 0; i < format->planesCount; ++i) {
format->planes[i].bpl = pix->plane_fmt[i].bytesperline;
@ -892,6 +908,7 @@ int V4L2VideoDevice::trySetFormatMultiplane(V4L2DeviceFormat *format, bool set)
pix->pixelformat = format->fourcc;
pix->num_planes = format->planesCount;
pix->field = V4L2_FIELD_NONE;
fromColorSpace(format->colorSpace, *pix);
ASSERT(pix->num_planes <= std::size(pix->plane_fmt));
@ -920,6 +937,7 @@ int V4L2VideoDevice::trySetFormatMultiplane(V4L2DeviceFormat *format, bool set)
format->planes[i].bpl = pix->plane_fmt[i].bytesperline;
format->planes[i].size = pix->plane_fmt[i].sizeimage;
}
format->colorSpace = toColorSpace(*pix);
return 0;
}
@ -943,6 +961,7 @@ int V4L2VideoDevice::getFormatSingleplane(V4L2DeviceFormat *format)
format->planesCount = 1;
format->planes[0].bpl = pix->bytesperline;
format->planes[0].size = pix->sizeimage;
format->colorSpace = toColorSpace(*pix);
return 0;
}
@ -959,6 +978,8 @@ int V4L2VideoDevice::trySetFormatSingleplane(V4L2DeviceFormat *format, bool set)
pix->pixelformat = format->fourcc;
pix->bytesperline = format->planes[0].bpl;
pix->field = V4L2_FIELD_NONE;
fromColorSpace(format->colorSpace, *pix);
ret = ioctl(set ? VIDIOC_S_FMT : VIDIOC_TRY_FMT, &v4l2Format);
if (ret) {
LOG(V4L2, Error)
@ -977,6 +998,7 @@ int V4L2VideoDevice::trySetFormatSingleplane(V4L2DeviceFormat *format, bool set)
format->planesCount = 1;
format->planes[0].bpl = pix->bytesperline;
format->planes[0].size = pix->sizeimage;
format->colorSpace = toColorSpace(*pix);
return 0;
}