avmodel: don't stop camera if active video calls

If, during a call, the user goes to the media settings and back to the
call, a SIP renegotiation was triggered, stopping the camera. If there
are existing calls (active renderers), don't stop the camera.

Change-Id: If3875157f7f27a55af4bfc3f08e08a78c951bd26

src/avmodel.cpp

@@ -404,6 +404,15 @@ AVModel::stopPreview()
         qWarning() << "Can't find preview renderer!";
         return;
     }
+    // If an active call does not have video muted, don't stop the camera
+    // stopCamera() calls switchInput(""), which disables the camera
+    bool previewShouldBeStopped = true;
+    for (auto it = pimpl_->renderers_.cbegin(); it != pimpl_->renderers_.cend(); ++it) {
+        if (it->second->getId() != video::PREVIEW_RENDERER_ID)
+            // If rendering, don't stop preview
+            previewShouldBeStopped &= !it->second->isRendering();
+    }
+    if (previewShouldBeStopped)
         VideoManager::instance().stopCamera();
     pimpl_->renderers_[video::PREVIEW_RENDERER_ID]->stopRendering();
 }

src/private/videorenderermanager.cpp

@@ -95,7 +95,6 @@ VideoRendererManager::deactivate()
     disconnect( &interface , &VideoManagerInterface::stoppedDecoding, d_ptr.data(), &VideoRendererManagerPrivate::stoppedDecoding);
 }
 
-
 VideoRendererManager::~VideoRendererManager()
 {
 //    delete d_ptr;
@@ -170,6 +169,15 @@ Video::Renderer* VideoRendererManager::previewRenderer()
 ///Stop video preview
 void VideoRendererManager::stopPreview()
 {
+    // If an active call does not have video muted, don't stop the camera
+    // stopCamera() calls switchInput(""), which disables the camera
+    bool previewShouldBeStopped = true;
+    for (auto it = d_ptr->m_hRenderers.begin(); it != d_ptr->m_hRenderers.end(); ++it) {
+        if (it.key() != PREVIEW_RENDERER_ID)
+            // If rendering, don't stop preview
+            previewShouldBeStopped &= !it.value()->isRendering();
+    }
+    if (previewShouldBeStopped)
         VideoManager::instance().stopCamera();
 
     d_ptr->m_PreviewState = false;
@@ -229,7 +237,6 @@ void VideoRendererManagerPrivate::startedDecoding(const QString& id, const QStri
 
 #endif
 
-
       QThread* t = new QThread(this);
       m_hThreads[r] = t;