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v4l2: Fix 4K colorimetry

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Since 1.6, the transfer function for BT2020 has been changed from BT709
to BT2020_12. It's the same function, but with more precision. As a side
effect, the V4L2 colorpsace didn't match GStreamer colorspace. When
GStreamer ended up making a guess, it would not match anything supported
by V4L2 anymore. This this by using BT2020_12 for BT2020 colorspace and
BT2020 transfer function in replacement of BT709 whenever a 4K
resolution is detected.
This commit is contained in:
Nicolas Dufresne 2017-07-18 11:28:37 -04:00
parent 08643993df
commit 6d0a9abdf0
1 changed files with 5 additions and 2 deletions
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7
sys/v4l2/gstv4l2object.c
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@ -1924,7 +1924,7 @@ gst_v4l2_object_get_colorspace (struct v4l2_format *fmt,
case V4L2_COLORSPACE_BT2020:
cinfo->range = GST_VIDEO_COLOR_RANGE_16_235;
cinfo->matrix = GST_VIDEO_COLOR_MATRIX_BT2020;
cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
cinfo->transfer = GST_VIDEO_TRANSFER_BT2020_12;
cinfo->primaries = GST_VIDEO_COLOR_PRIMARIES_BT2020;
break;
case V4L2_COLORSPACE_SMPTE240M:
@ -2026,7 +2026,10 @@ gst_v4l2_object_get_colorspace (struct v4l2_format *fmt,
switch (transfer) {
case V4L2_XFER_FUNC_709:
cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
if (fmt->fmt.pix.height > 2160)
cinfo->transfer = GST_VIDEO_TRANSFER_BT2020_12;
else
cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
break;
case V4L2_XFER_FUNC_SRGB:
cinfo->transfer = GST_VIDEO_TRANSFER_SRGB;