Handle resolution change in QGstreamerImageCapture

Add filter element in gstreamer queue and update size of
captured image when image settings are changed.

Task-number: QTBUG-98506
Change-Id: I87d8ed20cf5326f9f5db76626e476499a2e1d491
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
Reviewed-by: Lars Knoll <lars@knoll.priv.no>
(cherry picked from commit f27ba7f8759db070525ef4cbaae757a34d80a306)

2 files changed, 27 insertions, 3 deletions

diff --git a/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture.cpp b/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture.cpp
index 92bda67f2..793834d03 100644
--- a/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture.cpp
+++ b/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture.cpp
@@ -38,12 +38,13 @@ QGstreamerImageCapture::QGstreamerImageCapture(QImageCapture *parent)
     encoder = QGstElement("jpegenc", "jpegEncoder");
     muxer = QGstElement("jifmux", "jpegMuxer");
     sink = QGstElement("fakesink","imageCaptureSink");
+    filter = QGstElement("capsfilter", "filter");
     // imageCaptureSink do not wait for a preroll buffer when going READY -> PAUSED
     // as no buffer will arrive until capture() is called
     sink.set("async", false);
 
-    bin.add(queue, videoConvert, encoder, muxer, sink);
-    queue.link(videoConvert, encoder, muxer, sink);
+    bin.add(queue, filter, videoConvert, encoder, muxer, sink);
+    queue.link(filter, videoConvert, encoder, muxer, sink);
     bin.addGhostPad(queue, "sink");
 
     addProbeToPad(queue.staticPad("src").pad(), false);
@@ -119,6 +120,24 @@ int QGstreamerImageCapture::doCapture(const QString &fileName)
     return m_lastId;
 }
 
+void QGstreamerImageCapture::setResolution(const QSize &resolution)
+{
+    auto padCaps = QGstCaps(gst_pad_get_current_caps(bin.staticPad("sink").pad()), QGstCaps::HasRef);
+    if (padCaps.isNull()) {
+        qDebug() << "Camera not ready";
+        return;
+    }
+    auto caps = QGstCaps(gst_caps_copy(padCaps.get()), QGstCaps::HasRef);
+    if (caps.isNull()) {
+        return;
+    }
+    gst_caps_set_simple(caps.get(),
+        "width", G_TYPE_INT, resolution.width(),
+        "height", G_TYPE_INT, resolution.height(),
+        nullptr);
+    filter.set("caps", caps);
+}
+
 bool QGstreamerImageCapture::probeBuffer(GstBuffer *buffer)
 {
     if (!passImage)
@@ -264,8 +283,11 @@ QImageEncoderSettings QGstreamerImageCapture::imageSettings() const
 void QGstreamerImageCapture::setImageSettings(const QImageEncoderSettings &settings)
 {
     if (m_settings != settings) {
+        QSize resolution = settings.resolution();
+        if (m_settings.resolution() != resolution && !resolution.isEmpty()) {
+            setResolution(resolution);
+        }
         m_settings = settings;
-        // ###
     }
 }
 
diff --git a/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture_p.h b/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture_p.h
index b76649631..a41426a8d 100644
--- a/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture_p.h
+++ b/src/plugins/multimedia/gstreamer/mediacapture/qgstreamerimagecapture_p.h
@@ -53,6 +53,7 @@ public Q_SLOTS:
     void onCameraChanged();
 
 private:
+    void setResolution(const QSize &resolution);
     int doCapture(const QString &fileName);
     static gboolean saveImageFilter(GstElement *element, GstBuffer *buffer, GstPad *pad, void *appdata);
 
@@ -70,6 +71,7 @@ private:
 
     QGstBin bin;
     QGstElement queue;
+    QGstElement filter;
     QGstElement videoConvert;
     QGstElement encoder;
     QGstElement muxer;