From 58376e22a0f93c48ed93ff66bf8dd90e4219342f Mon Sep 17 00:00:00 2001
From: Stef Boerrigter <stef.boerrigter@bench.com>
Date: Tue, 10 Mar 2020 12:27:07 +0100
Subject: [PATCH] Update viewport if cropped video metadata available

---
 src/gsttools/qgstvideorenderersink.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/gsttools/qgstvideorenderersink.cpp b/src/gsttools/qgstvideorenderersink.cpp
index 597b974..0c4f8bb 100644
--- a/src/gsttools/qgstvideorenderersink.cpp
+++ b/src/gsttools/qgstvideorenderersink.cpp
@@ -90,6 +90,23 @@ void QGstDefaultVideoRenderer::stop(QAbstractVideoSurface *surface)
 bool QGstDefaultVideoRenderer::present(QAbstractVideoSurface *surface, GstBuffer *buffer)
 {
     m_flushed = false;
+    
+    auto meta = gst_buffer_get_video_crop_meta (buffer);
+    if (meta)
+    {
+        QRect vp(meta->x, meta->y, meta->width, meta->height); 
+        if(m_format.viewport() != vp)
+        {
+            //qDebug() << "Metadata: " << meta->height << "x" << meta->width << " : " << meta->x << "x" << meta->y << " || Updating viewport";// << vp; 
+            //Update viewport if data is not the same
+            m_format.setViewport(vp);
+            surface->start(m_format);
+        }
+        else
+        {
+            //qDebug() << "Viewport matches updated crop metadata, no change required.."
+        }
+    }
     QVideoFrame frame(
                 new QGstVideoBuffer(buffer, m_videoInfo),
                 m_format.frameSize(),
-- 
2.7.4