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libcamera: v4l2_videodevice: Reintroduce toV4L2PixelFormat()

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This is a partial revert of commit 395d43d6d7 ("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>
This commit is contained in:
Jacopo Mondi 2022-07-15 10:50:41 +02:00
parent 83e0cee0ba
commit 45736468c8
12 changed files with 60 additions and 37 deletions
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2
test/libtest/buffer_source.cpp
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@ -72,7 +72,7 @@ int BufferSource::allocate(const StreamConfiguration &config)
}
format.size = config.size;
format.fourcc = V4L2PixelFormat::fromPixelFormat(config.pixelFormat);
format.fourcc = video->toV4L2PixelFormat(config.pixelFormat);
if (video->setFormat(&format)) {
std::cout << "Failed to set format on output device" << std::endl;
return TestFail;