4 files changed, 6 insertions, 6 deletions
diff --git a/src/qmmp/decoder.cpp b/src/qmmp/decoder.cpp
index f7938c71c..300c98f1e 100644
--- a/src/qmmp/decoder.cpp
+++ b/src/qmmp/decoder.cpp
@@ -59,12 +59,12 @@ const QString Decoder::nextURL() const
     return QString();
 }
 
-AudioParameters Decoder::audioParameters() const
+const AudioParameters &Decoder::audioParameters() const
 {
     return m_parameters;
 }
 
-QMap<Qmmp::ReplayGainKey, double> Decoder::replayGainInfo() const
+const QMap<Qmmp::ReplayGainKey, double> &Decoder::replayGainInfo() const
 {
     return m_rg;
 }
diff --git a/src/qmmp/decoder.h b/src/qmmp/decoder.h
index 61a60ef38..71bdcb403 100644
--- a/src/qmmp/decoder.h
+++ b/src/qmmp/decoder.h
@@ -76,11 +76,11 @@ public:
     /*!
      * Returns detected audio parameters.
      */
-    AudioParameters audioParameters() const;
+    const AudioParameters &audioParameters() const;
     /*!
      * Returns ReplayGain information.
      */
-    QMap<Qmmp::ReplayGainKey, double> replayGainInfo() const;
+    const QMap<Qmmp::ReplayGainKey, double> &replayGainInfo() const;
     /*!
      * Sets ReplayGain information. Use this function before playback.
      * @param rg ReplayGain information
diff --git a/src/qmmp/output.cpp b/src/qmmp/output.cpp
index 8dfdcdb9d..21c4f5813 100644
--- a/src/qmmp/output.cpp
+++ b/src/qmmp/output.cpp
@@ -44,7 +44,7 @@ int Output::channels() const
     return m_chan_map.count();
 }
 
-const ChannelMap Output::channelMap() const
+const ChannelMap &Output::channelMap() const
 {
     return m_chan_map;
 }
diff --git a/src/qmmp/output.h b/src/qmmp/output.h
index 8ff367bec..9a1a10d65 100644
--- a/src/qmmp/output.h
+++ b/src/qmmp/output.h
@@ -97,7 +97,7 @@ public:
     /*!
      * Returns required channel map.
      */
-    const ChannelMap channelMap() const;
+    const ChannelMap &channelMap() const;
     /*!
      * Returns selected audio format.
      */