libcamera: v4l2_videodevice: Reintroduce toV4L2PixelFormat()

This is a partial revert of commit 395d43d6d75b ("libcamera:
v4l2_videodevice: Drop toV4L2PixelFormat()")

The function was removed because it incorrectly maps non-contiguous V4L2
format variants (ie V4L2_PIX_FMT_YUV420M) to the API version supported
by the video device (singleplanar API and multiplanar API).  It was
decided at the time to remove the function and let its users call
directly V4L2PixelFormat::fromPixelFormat() which accepts a
'multiplanar' flags.

As we aim to associate multiple V4L2PixelFormat to a single libcamera
format, the next patches will verify which of them is actually supported
by the video device. For now, return the contiguous version
unconditionally.

Re-introduce V4L2VideoDevice::toV4L2PixelFormat() and convert all
the V4L2PixelFormat::fromPixelFormat() users to use it.

The V4L2 compatibility layer is the only outlier as it doesn't have a
video device to poke, hence it still uses
V4L2PixelFormat::fromPixelFormat().

Next patches will implement the device format matching logic and handle
the non-contiguous plane issue in V4L2VideoDevice::toV4L2PixelFormat().

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Paul Elder <paul.elder@ideasonboard.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libcamera/pipeline/vimc/vimc.cpp b/src/libcamera/pipeline/vimc/vimc.cpp
index 3379ac5c..153cf849 100644
--- a/src/libcamera/pipeline/vimc/vimc.cpp
+++ b/src/libcamera/pipeline/vimc/vimc.cpp
@@ -171,7 +171,7 @@ CameraConfiguration::Status VimcCameraConfiguration::validate()
 	cfg.bufferCount = 4;
 
 	V4L2DeviceFormat format;
-	format.fourcc = V4L2PixelFormat::fromPixelFormat(cfg.pixelFormat);
+	format.fourcc = data_->video_->toV4L2PixelFormat(cfg.pixelFormat);
 	format.size = cfg.size;
 
 	int ret = data_->video_->tryFormat(&format);
@@ -275,7 +275,7 @@ int PipelineHandlerVimc::configure(Camera *camera, CameraConfiguration *config)
 		return ret;
 
 	V4L2DeviceFormat format;
-	format.fourcc = V4L2PixelFormat::fromPixelFormat(cfg.pixelFormat);
+	format.fourcc = data->video_->toV4L2PixelFormat(cfg.pixelFormat);
 	format.size = cfg.size;
 
 	ret = data->video_->setFormat(&format);
@@ -283,7 +283,7 @@ int PipelineHandlerVimc::configure(Camera *camera, CameraConfiguration *config)
 		return ret;
 
 	if (format.size != cfg.size ||
-	    format.fourcc != V4L2PixelFormat::fromPixelFormat(cfg.pixelFormat))
+	    format.fourcc != data->video_->toV4L2PixelFormat(cfg.pixelFormat))
 		return -EINVAL;
 
 	/*
@@ -598,7 +598,7 @@ int VimcCameraData::allocateMockIPABuffers()
 	constexpr unsigned int kBufCount = 2;
 
 	V4L2DeviceFormat format;
-	format.fourcc = V4L2PixelFormat::fromPixelFormat(formats::BGR888);
+	format.fourcc = video_->toV4L2PixelFormat(formats::BGR888);
 	format.size = Size (160, 120);
 
 	int ret = video_->setFormat(&format);