mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-24 19:00:36 -05:00
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// 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 as version 3 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "audioresampler.h"
|
|
|
|
AudioResampler::AudioResampler() :
|
|
m_decimation(1),
|
|
m_decimationCount(0)
|
|
{}
|
|
|
|
AudioResampler::~AudioResampler()
|
|
{}
|
|
|
|
void AudioResampler::setDecimation(uint32_t decimation)
|
|
{
|
|
m_decimation = decimation == 0 ? 1 : decimation;
|
|
}
|
|
|
|
void AudioResampler::setAudioFilters(int srHigh, int srLow, int fcLow, int fcHigh, float gain)
|
|
{
|
|
srHigh = (srHigh <= 100 ? 100 : srHigh);
|
|
srLow = (srLow <= 0 ? 1 : srLow);
|
|
srLow = srLow > srHigh - 50 ? srHigh - 50 : srLow;
|
|
|
|
fcLow = fcLow < 0 ? 0 : fcLow;
|
|
fcHigh = fcHigh < 100 ? 100 : fcHigh;
|
|
fcLow = fcLow > fcHigh - 100 ? fcHigh - 100 : fcLow;
|
|
|
|
m_audioFilter.setDecimFilters(srHigh, srLow, fcHigh, fcLow, gain);
|
|
}
|
|
|
|
bool AudioResampler::downSample(qint16 sampleIn, qint16& sampleOut)
|
|
{
|
|
if (m_decimation == 1)
|
|
{
|
|
sampleOut = sampleIn;
|
|
return true;
|
|
}
|
|
|
|
if (m_decimationCount >= m_decimation - 1)
|
|
{
|
|
float lpSample = m_audioFilter.run(sampleIn / 32768.0f);
|
|
sampleOut = lpSample * 32768.0f;
|
|
m_decimationCount = 0;
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
m_decimationCount++;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool AudioResampler::upSample(qint16 sampleIn, qint16& sampleOut)
|
|
{
|
|
float lpSample;
|
|
|
|
if (m_decimation == 1)
|
|
{
|
|
sampleOut = sampleIn;
|
|
return true;
|
|
}
|
|
|
|
if (m_decimationCount >= m_decimation - 1)
|
|
{
|
|
m_decimationCount = 0;
|
|
lpSample = m_audioFilter.run(sampleIn / 32768.0f);
|
|
sampleOut = lpSample * 32768.0f;
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
m_decimationCount++;
|
|
lpSample = m_audioFilter.run(0.0f);
|
|
sampleOut = lpSample * 32768.0f;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|