[PATCH v3] gstreamer: Read correct colorimetry from caps into the stream configuration

[Hou Qi]

When libcamerasrc is negotiating with downstream element, it first
extracts colorimetry field from downstream supported caps, then set
this colorimetry to its stream configuration and propagates the
colorimetry downstream.

Currently libamerasrc only considers the case there is one colorimetry
in colorimetry field of downstream caps. But the issue is that
downstream caps may report a list of supported colorimetry, which
causes libcamerasrc to set unknown colorimetry to stream configuration
and negotiate fail with downstream element.

In order to fix the issue, need to fixate colorimetry field before
getting colorimetry string.

Signed-off-by: Hou Qi <qi.hou at nxp.com>
---
 src/gstreamer/gstlibcamera-utils.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/gstreamer/gstlibcamera-utils.cpp b/src/gstreamer/gstlibcamera-utils.cpp
index a466b305..7b34c759 100644
--- a/src/gstreamer/gstlibcamera-utils.cpp
+++ b/src/gstreamer/gstlibcamera-utils.cpp
@@ -493,9 +493,12 @@ void gst_libcamera_configure_stream_from_caps(StreamConfiguration &stream_cfg,
 
 	/* Configure colorimetry */
 	if (gst_structure_has_field(s, "colorimetry")) {
-		const gchar *colorimetry_str = gst_structure_get_string(s, "colorimetry");
+		const gchar *colorimetry_str;
 		GstVideoColorimetry colorimetry;
 
+		gst_structure_fixate_field(s, "colorimetry");
+		colorimetry_str = gst_structure_get_string(s, "colorimetry");
+
 		if (!gst_video_colorimetry_from_string(&colorimetry, colorimetry_str))
 			g_critical("Invalid colorimetry %s", colorimetry_str);
 
-- 
2.34.1