Downmix filter will now check if the input already is Mono/Stereo, so we can safely invoke the filter for ALL sources.

doc/Changelog.html

@@ -23,6 +23,7 @@ a:visited { color: #0000EE; }
 <li>Updated Qt runtime libraries to v4.8.0 Beta-1 (2011-07-19), compiled with MSVC 10.0
 <li>Updated MediaInfo to v0.7.47 (2011-07-27), compiled with MSVC 10.0
 <li>Updated language files (big thank-you to all contributors !!!)
+<li>Improved "downmix" filter by using explicit channel mappings for each number of input channels
 <li>Fixed Cue Sheet import for tracks with certain characters in the title
 <li>Workaround for malicious "anti-virus" programs that prevent innocent applications from functioning
 <li>Enabled "Aero Glass" theme in installer and web-update program (Vista and Windows 7 only)

etc/Translation/Blank.ts

@@ -2413,77 +2413,77 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="215"/>
+        <location filename="../../src/Thread_Process.cpp" line="213"/>
         <source>Done.</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="215"/>
+        <location filename="../../src/Thread_Process.cpp" line="213"/>
         <source>Aborted!</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="215"/>
+        <location filename="../../src/Thread_Process.cpp" line="213"/>
         <source>Failed!</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="230"/>
+        <location filename="../../src/Thread_Process.cpp" line="228"/>
         <source>Encoding</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="233"/>
+        <location filename="../../src/Thread_Process.cpp" line="231"/>
         <source>Filtering</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="236"/>
+        <location filename="../../src/Thread_Process.cpp" line="234"/>
         <source>Decoding</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="259"/>
+        <location filename="../../src/Thread_Process.cpp" line="257"/>
         <source>The source audio file could not be found:</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="266"/>
+        <location filename="../../src/Thread_Process.cpp" line="264"/>
         <source>The source audio file could not be opened for reading:</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="292"/>
+        <location filename="../../src/Thread_Process.cpp" line="290"/>
         <source>The target output directory doesn&apos;t exist and could NOT be created:</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="300"/>
+        <location filename="../../src/Thread_Process.cpp" line="298"/>
         <source>The target output directory is NOT writable:</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="310"/>
+        <location filename="../../src/Thread_Process.cpp" line="308"/>
         <source>Unknown File Name</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="312"/>
+        <location filename="../../src/Thread_Process.cpp" line="310"/>
         <source>Unknown Title</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="313"/>
+        <location filename="../../src/Thread_Process.cpp" line="311"/>
         <source>Unknown Artist</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="314"/>
+        <location filename="../../src/Thread_Process.cpp" line="312"/>
         <source>Unknown Album</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../../src/Thread_Process.cpp" line="316"/>
+        <location filename="../../src/Thread_Process.cpp" line="314"/>
         <source>Unknown Comment</source>
         <translation type="unfinished"></translation>
     </message>

src/Config.h

@@ -29,8 +29,8 @@
 #define VER_LAMEXP_MINOR_HI					0
 #define VER_LAMEXP_MINOR_LO					3
 #define VER_LAMEXP_TYPE						Alpha
-#define VER_LAMEXP_PATCH					8
+#define VER_LAMEXP_PATCH					9
-#define VER_LAMEXP_BUILD					626
+#define VER_LAMEXP_BUILD					628
 
 ///////////////////////////////////////////////////////////////////////////////
 // Tools versions

src/Dialog_Processing.cpp

@@ -649,7 +649,7 @@ void ProcessingDialog::startNextJob(void)
 	);
 
 	//Add audio filters
-	if(m_settings->forceStereoDownmix() && ((currentFile.formatAudioChannels() > 2) || (currentFile.formatAudioChannels() == 0)))
+	if(m_settings->forceStereoDownmix())
 	{
 		thread->addFilter(new DownmixFilter());
 	}

src/Filter_Downmix.cpp

@@ -46,6 +46,13 @@ bool DownmixFilter::apply(const QString &sourceFile, const QString &outputFile,
 	unsigned int channels = detectChannels(sourceFile, abortFlag);
 	emit messageLogged(QString().sprintf("--> Number of channels is: %d\n", channels));
 
+	if((channels == 1) || (channels == 2))
+	{
+		messageLogged("Skipping downmix!");
+		qDebug("Dowmmix not required for Mono or Stereo input, skipping!");
+		return false;
+	}
+
 	QProcess process;
 	QStringList args;
 

src/Thread_Process.cpp

@@ -135,7 +135,7 @@ void ProcessThread::processFile()
 	}
 
 	//Do we need Stereo downmix?
-	if(m_encoder->requiresDownmix() && ((m_audioFile.formatAudioChannels() > 2) || (m_audioFile.formatAudioChannels() == 0)))
+	if(m_encoder->requiresDownmix())
 	{
 		insertDownmixFilter();
 	}
@@ -173,29 +173,27 @@ void ProcessThread::processFile()
 		}
 	}
 
-	//Apply all filters
+	//Apply all audio filters
+	if(bSuccess)
+	{
 		while(!m_filters.isEmpty())
 		{
 			QString tempFile = generateTempFileName();
 			AbstractFilter *poFilter = m_filters.takeFirst();
+			m_currentStep = FilteringStep;
 
-		if(bSuccess)
-		{
 			connect(poFilter, SIGNAL(statusUpdated(int)), this, SLOT(handleUpdate(int)), Qt::DirectConnection);
 			connect(poFilter, SIGNAL(messageLogged(QString)), this, SLOT(handleMessage(QString)), Qt::DirectConnection);
 
-			m_currentStep = FilteringStep;
+			if(poFilter->apply(sourceFile, tempFile, &m_aborted))
-			bSuccess = poFilter->apply(sourceFile, tempFile, &m_aborted);
-
-			if(bSuccess)
 			{
 				sourceFile = tempFile;
-				handleMessage("\n-------------------------------\n");
-			}
 			}
 
+			handleMessage("\n-------------------------------\n");
 			delete poFilter;
 		}
+	}
 
 	//Encode audio file
 	if(bSuccess)