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v4l2object: handle unsupported hlg colorimetry gracefully
This patch addresses the issue where GStreamer would throw an error when attempting to use bt2100-hlg colorimetry with V4L2, which is not supported by the current V4L2 kernel. When bt2100-hlg colorimetry is set from caps, the check for transfer (GST_VIDEO_TRANSFER_ARIB_STD_B67) is bypassed. The main improvement is to avoid checking the transfer value in gst_v4l2_video_colorimetry_matches when it is GST_VIDEO_TRANSFER_ARIB_STD_B67. This is because the transfer value in the cinfo parameter comes from gst_v4l2_object_get_colorspace, which converts the transfer to another value, causing a mismatch. Since the kernel does not support GST_VIDEO_TRANSFER_ARIB_STD_B67, gst_v4l2_object_get_colorspace cannot map it correctly from V4L2 to GStreamer. Therefore, we ignore this check to prevent errors. changes: - Added a condition in gst_v4l2_video_colorimetry_matches to bypass the transfer check when the transfer is GST_VIDEO_TRANSFER_ARIB_STD_B67. - Ensured that the pipeline does not throw errors due to unsupported bt2100-hlg colorimetry in V4L2. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7212>
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@ -3756,6 +3756,18 @@ gst_v4l2_video_colorimetry_matches (const GstVideoColorimetry * cinfo,
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&& gst_video_colorimetry_is_equal (cinfo, &ci_jpeg))
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return TRUE;
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/* bypass check the below GST_VIDEO_TRANSFER_ARIB_STD_B67 type,
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* because kernel do not support it. GST_VIDEO_TRANSFER_ARIB_STD_B67 is cast
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* to GST_VIDEO_TRANSFER_BT2020_12 type in gst_v4l2_object_get_colorspace */
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if (info.colorimetry.transfer == GST_VIDEO_TRANSFER_ARIB_STD_B67) {
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info.colorimetry.transfer = cinfo->transfer;
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GST_WARNING
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("v4l2 framework do not support GST_VIDEO_TRANSFER_ARIB_STD_B67");
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if (gst_video_colorimetry_is_equal (&info.colorimetry, cinfo))
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return TRUE;
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}
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/* bypass check the below transfer types, because those types are cast to
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* V4L2_XFER_FUNC_NONE type when try format or set format and V4L2_XFER_FUNC_NONE
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* type is cast to GST_VIDEO_TRANSFER_GAMMA10 type in gst_v4l2_object_get_colorspace */
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