1 files changed, 105 insertions, 0 deletions
diff --git a/src/audio/AudioBuffer.cpp b/src/audio/AudioBuffer.cpp
new file mode 100644
index 0000000..64032c3
--- /dev/null
+++ b/src/audio/AudioBuffer.cpp
@@ -0,0 +1,105 @@
+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library 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
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+//  Original author of this file is Nick Hebner (hebnern@gmail.com).
+//
+
+#include "AudioBuffer.h"
+
+#include <string>
+#include <cstring>
+
+#define VOLUME_FADE_SAMPLES 100
+
+namespace avg {
+
+AudioBuffer::AudioBuffer(int numFrames, AudioParams ap)
+    : m_NumFrames(numFrames),
+      m_AP(ap)
+{
+    m_pData = new short[numFrames*sizeof(short)*ap.m_Channels];
+}
+
+AudioBuffer::~AudioBuffer()
+{
+    delete[] m_pData;
+}
+
+short* AudioBuffer::getData()
+{
+    return m_pData;
+}
+
+int AudioBuffer::getNumFrames()
+{
+    return m_NumFrames;
+}
+
+int AudioBuffer::getNumBytes()
+{
+    return m_NumFrames*m_AP.m_Channels*sizeof(short);
+}
+
+int AudioBuffer::getFrameSize()
+{
+    return m_AP.m_Channels*sizeof(short);
+}
+
+int AudioBuffer::getNumChannels()
+{
+    return m_AP.m_Channels;
+}
+
+int AudioBuffer::getRate()
+{
+    return m_AP.m_SampleRate;
+}
+
+void AudioBuffer::clear()
+{
+    memset(m_pData, 0, m_NumFrames*sizeof(short)*m_AP.m_Channels);
+}
+
+void AudioBuffer::volumize(float lastVol, float curVol)
+{
+    float volDiff = lastVol - curVol;
+    
+    if (curVol == 1.0f && volDiff == 0.0f) {
+        return;
+    }
+   
+    for (int i = 0; i < m_NumFrames*m_AP.m_Channels; i++) {
+        float fadeVol = 0;
+        if (volDiff != 0 && i < VOLUME_FADE_SAMPLES) {
+            fadeVol = volDiff * (VOLUME_FADE_SAMPLES - i) / VOLUME_FADE_SAMPLES;
+        }
+        
+        int s = int(m_pData[i] * (curVol + fadeVol));
+        
+        if (s < -32768)
+            s = -32768;
+        if (s >  32767)
+            s = 32767;
+        
+        m_pData[i] = s;
+    }
+}
+
+}