libmp3lame encoder: don't retrieve settings for each run.

Retrieve the encoder settings only when creating the object or when saving.
Avoids unnecessary overhead by accessing the settings object on each encoder
call, which also clutters the system trace log.

Change-Id: If64e5d1d5ac8f1d4b0afd1bc4851e455fc7e64c2

2 files changed, 11 insertions, 4 deletions

diff --git a/rbutil/rbutilqt/base/encoderlame.cpp b/rbutil/rbutilqt/base/encoderlame.cpp
index 9550eb5..6cc93ff 100644
--- a/rbutil/rbutilqt/base/encoderlame.cpp
+++ b/rbutil/rbutilqt/base/encoderlame.cpp
@@ -51,6 +51,9 @@ EncoderLame::EncoderLame(QObject *parent) : EncoderBase(parent)
     SYMBOLRESOLVE(lame_close, int (*)(lame_global_flags*));
 
     qDebug() << "[EncoderLame] libmp3lame loaded:" << lib->isLoaded();
+
+    m_encoderVolume = RbSettings::subValue("lame", RbSettings::EncoderVolume).toDouble();
+    m_encoderQuality = RbSettings::subValue("lame", RbSettings::EncoderQuality).toDouble();
     m_symbolsResolved = true;
 }
 
@@ -87,6 +90,10 @@ void EncoderLame::saveSettings()
                 getSetting(VOLUME)->current().toDouble());
         RbSettings::setSubValue("lame", RbSettings::EncoderQuality,
                 getSetting(QUALITY)->current().toDouble());
+        m_encoderVolume =
+            RbSettings::subValue("lame", RbSettings::EncoderVolume).toDouble();
+        m_encoderQuality =
+            RbSettings::subValue("lame", RbSettings::EncoderQuality).toDouble();
     }
 }
 
@@ -128,13 +135,11 @@ bool EncoderLame::encode(QString input,QString output)
     gfp = m_lame_init();
     m_lame_set_out_samplerate(gfp, 12000);      // resample to 12kHz
     // scale input volume
-    m_lame_set_scale(gfp,
-            RbSettings::subValue("lame", RbSettings::EncoderVolume).toDouble());
+    m_lame_set_scale(gfp, m_encoderVolume);
     m_lame_set_mode(gfp, MONO);                 // mono output mode
     m_lame_set_VBR(gfp, vbr_default);           // enable default VBR mode
     // VBR quality
-    m_lame_set_VBR_quality(gfp,
-            RbSettings::subValue("lame", RbSettings::EncoderQuality).toDouble());
+    m_lame_set_VBR_quality(gfp, m_encoderQuality);
     m_lame_set_VBR_max_bitrate_kbps(gfp, 64);   // maximum bitrate 64kbps
     m_lame_set_bWriteVbrTag(gfp, 0);            // disable LAME tag.
 
diff --git a/rbutil/rbutilqt/base/encoderlame.h b/rbutil/rbutilqt/base/encoderlame.h
index 8b94445..a8651f0 100644
--- a/rbutil/rbutilqt/base/encoderlame.h
+++ b/rbutil/rbutilqt/base/encoderlame.h
@@ -64,6 +64,8 @@ class EncoderLame : public EncoderBase
         int (*m_lame_close)(lame_global_flags*);
 
         bool m_symbolsResolved;
+        double m_encoderVolume;
+        double m_encoderQuality;
 };
 
 #endif