added replay gain api

git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@1444 90c681e8-e032-0410-971d-27865f9a5e38

3 files changed, 110 insertions, 1 deletions

diff --git a/src/qmmp/replaygain.cpp b/src/qmmp/replaygain.cpp
new file mode 100644
index 000000000..876797593
--- /dev/null
+++ b/src/qmmp/replaygain.cpp
@@ -0,0 +1,62 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Ilya Kotov                                      *
+ *   forkotov02@hotmail.ru                                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include <math.h>
+#include "replaygain.h"
+
+ReplayGain::ReplayGain()
+{
+    m_freq = 0;
+    m_chan = 0;
+    m_bits = 0;
+    m_scale = 0;
+}
+
+void ReplayGain::configure(quint32 freq, int chan, int bits)
+{
+    m_bits = bits;
+}
+
+void ReplayGain::setReplayGainInfo(const ReplayGainInfo &info)
+{
+    m_info = info;
+    m_scale = pow(10.0, (info.trackGain()/20) * info.trackPeak());
+}
+
+void ReplayGain::applyReplayGain(char *data, qint64 size)
+{
+    size = size*8/m_bits;
+    if(m_bits == 16)
+    {
+        for (qint64 i = 0; i < size; i++)
+            ((short*)data)[i]*= m_scale;
+
+    }
+    else if(m_bits == 8)
+    {
+        for (qint64 i = 0; i < size; i++)
+            ((char*)data)[i]*= m_scale;
+    }
+    else if(m_bits == 32)
+    {
+        for (qint64 i = 0; i < size; i++)
+           ((qint32*)data)[i]*= m_scale;
+    }
+}
diff --git a/src/qmmp/replaygain.h b/src/qmmp/replaygain.h
new file mode 100644
index 000000000..67f52243b
--- /dev/null
+++ b/src/qmmp/replaygain.h
@@ -0,0 +1,47 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Ilya Kotov                                      *
+ *   forkotov02@hotmail.ru                                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifndef REPLAYGAIN_H
+#define REPLAYGAIN_H
+
+#include <QtGlobal>
+#include "replaygaininfo.h"
+
+/*!
+ * @author Ilya Kotov <forkotov02@hotmail.ru>
+ */
+class ReplayGain
+{
+public:
+    ReplayGain();
+
+    void configure(quint32 freq, int chan, int bits);
+    void setReplayGainInfo(const ReplayGainInfo &info);
+    void applyReplayGain(char *data, qint64 size);
+
+private:
+    quint32 m_freq;
+    int m_chan;
+    int m_bits;
+    ReplayGainInfo m_info;
+    double m_scale;
+};
+
+#endif // REPLAYGAIN_H
diff --git a/src/qmmp/volumecontrol.cpp b/src/qmmp/volumecontrol.cpp
index d2d768f58..2e6379104 100644
--- a/src/qmmp/volumecontrol.cpp
+++ b/src/qmmp/volumecontrol.cpp
@@ -170,7 +170,7 @@ void SoftwareVolume::changeVolume(uchar *data, qint64 size, int chan, int bits)
         }
         else
         {
-            for (qint64 i = 0; i < size/4; i++)
+            for (qint64 i = 0; i < size; i++)
                 ((qint32*)data)[i]*= qMax(m_scaleRight, m_scaleLeft);
         }
     }