added empty implementations for Visual::start() and Visual::stop()

git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@8866 90c681e8-e032-0410-971d-27865f9a5e38

2 files changed, 10 insertions, 4 deletions

diff --git a/src/qmmp/visual.cpp b/src/qmmp/visual.cpp
index 4bd820ac4..d2d726018 100644
--- a/src/qmmp/visual.cpp
+++ b/src/qmmp/visual.cpp
@@ -238,6 +238,12 @@ void Visual::clearBuffer()
     m_buffer.mutex()->unlock();
 }
 
+void Visual::start()
+{}
+
+void Visual::stop()
+{}
+
 void Visual::checkFactories()
 {
     if (!m_factories)
diff --git a/src/qmmp/visual.h b/src/qmmp/visual.h
index e71ccb33c..5c9b5ab4b 100644
--- a/src/qmmp/visual.h
+++ b/src/qmmp/visual.h
@@ -110,13 +110,13 @@ public:
 
 public slots:
     /*!
-     * Starts visualization.
+     * Starts visualization. Default implementation does nothing.
      */
-    virtual void start() = 0;
+    virtual void start();
     /*!
-     * Stops visualization.
+     * Stops visualization. Default implementation does nothing.
      */
-    virtual void stop() = 0;
+    virtual void stop();
 
 signals:
     /*!