gstreamer: Add GstVideoMeta support

GStreamer video-info calculated stride and offset may differ from
those used by the camera.

For stride and offset mismatch, this patch adds video meta to buffer
if downstream supports VideoMeta through allocation query. Otherwise,
create a internal VideoPool using the caps, and copy video frame to
this system memory.

Signed-off-by: Hou Qi <qi.hou@nxp.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/gstreamer/gstlibcamerapad.cpp b/src/gstreamer/gstlibcamerapad.cpp
index 7b22aebe..3bc2bc87 100644
--- a/src/gstreamer/gstlibcamerapad.cpp
+++ b/src/gstreamer/gstlibcamerapad.cpp
@@ -18,6 +18,8 @@ struct _GstLibcameraPad {
 	GstPad parent;
 	StreamRole role;
 	GstLibcameraPool *pool;
+	GstBufferPool *video_pool;
+	GstVideoInfo info;
 	GstClockTime latency;
 };
 
@@ -153,6 +155,35 @@ gst_libcamera_pad_set_pool(GstPad *pad, GstLibcameraPool *pool)
 	self->pool = pool;
 }
 
+GstBufferPool *
+gst_libcamera_pad_get_video_pool(GstPad *pad)
+{
+	auto *self = GST_LIBCAMERA_PAD(pad);
+	return self->video_pool;
+}
+
+void gst_libcamera_pad_set_video_pool(GstPad *pad, GstBufferPool *video_pool)
+{
+	auto *self = GST_LIBCAMERA_PAD(pad);
+
+	if (self->video_pool)
+		g_object_unref(self->video_pool);
+	self->video_pool = video_pool;
+}
+
+GstVideoInfo gst_libcamera_pad_get_video_info(GstPad *pad)
+{
+	auto *self = GST_LIBCAMERA_PAD(pad);
+	return self->info;
+}
+
+void gst_libcamera_pad_set_video_info(GstPad *pad, const GstVideoInfo *info)
+{
+	auto *self = GST_LIBCAMERA_PAD(pad);
+
+	self->info = *info;
+}
+
 Stream *
 gst_libcamera_pad_get_stream(GstPad *pad)
 {