gstreamer: Add bayer8 support to libcamerasrc element

Bayer8 support is useful on hardware such as Librem 5, as GStreamer
provides easy solution for debayering and display of the camera
data. Add necessary glue to libcamerasrc element.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/gstreamer/gstlibcamera-utils.cpp b/src/gstreamer/gstlibcamera-utils.cpp
index 36b9564c..16aac441 100644
--- a/src/gstreamer/gstlibcamera-utils.cpp
+++ b/src/gstreamer/gstlibcamera-utils.cpp
@@ -20,6 +20,12 @@ static struct {
 	/* Compressed */
 	{ GST_VIDEO_FORMAT_ENCODED, formats::MJPEG },
 
+	/* Bayer formats, gstreamer only supports 8-bit */
+	{ GST_VIDEO_FORMAT_ENCODED, formats::SBGGR8 },
+	{ GST_VIDEO_FORMAT_ENCODED, formats::SGBRG8 },
+	{ GST_VIDEO_FORMAT_ENCODED, formats::SGRBG8 },
+	{ GST_VIDEO_FORMAT_ENCODED, formats::SRGGB8 },
+
 	/* RGB16 */
 	{ GST_VIDEO_FORMAT_RGB16, formats::RGB565 },
 
@@ -228,6 +234,22 @@ gst_format_to_pixel_format(GstVideoFormat gst_format)
 	return PixelFormat{};
 }
 
+static const gchar *
+bayer_format_to_string(int format)
+{
+	switch (format) {
+	case formats::SBGGR8:
+		return "bggr";
+	case formats::SGBRG8:
+		return "gbrg";
+	case formats::SGRBG8:
+		return "grbg";
+	case formats::SRGGB8:
+		return "rggb";
+	}
+	return NULL;
+}
+
 static GstStructure *
 bare_structure_from_format(const PixelFormat &format)
 {
@@ -243,6 +265,14 @@ bare_structure_from_format(const PixelFormat &format)
 	switch (format) {
 	case formats::MJPEG:
 		return gst_structure_new_empty("image/jpeg");
+
+	case formats::SBGGR8:
+	case formats::SGBRG8:
+	case formats::SGRBG8:
+	case formats::SRGGB8:
+		return gst_structure_new("video/x-bayer", "format", G_TYPE_STRING,
+					 bayer_format_to_string(format), nullptr);
+
 	default:
 		return nullptr;
 	}