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//
// 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;
}
}
}
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