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dsd_mbe.cpp
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// 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 //
// //
// 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 <string.h>
#include <math.h>
#include "dsd_mbe.h"
#include "dsd_decoder.h"
namespace DSDcc
{
DSDMBEDecoder::DSDMBEDecoder(DSDDecoder *dsdDecoder) :
m_dsdDecoder(dsdDecoder),
m_upsamplerLastValue(0.0f)
{
m_cur_mp = (mbe_parms *) malloc(sizeof(mbe_parms));
m_prev_mp = (mbe_parms *) malloc(sizeof(mbe_parms));
m_prev_mp_enhanced = (mbe_parms *) malloc(sizeof(mbe_parms));
m_audio_out_temp_buf_p = m_audio_out_temp_buf;
memset(m_audio_out_float_buf, 0, sizeof(float) * 1120);
m_audio_out_float_buf_p = m_audio_out_float_buf;
memset(m_aout_max_buf, 0, sizeof(float) * 200);
m_aout_max_buf_p = m_aout_max_buf;
m_aout_max_buf_idx = 0;
memset(m_audio_out_buf, 0, sizeof(short) * 2 * 48000);
m_audio_out_buf_p = m_audio_out_buf;
m_audio_out_nb_samples = 0;
m_audio_out_buf_size = 48000; // given in number of unique samples
m_audio_out_idx = 0;
m_audio_out_idx2 = 0;
m_aout_gain = 25;
m_auto_gain = true;
m_stereo = false;
m_channels = 3; // both channels by default if stereo is set
m_upsample = 0;
initMbeParms();
}
DSDMBEDecoder::~DSDMBEDecoder()
{
free(m_prev_mp_enhanced);
free(m_prev_mp);
free(m_cur_mp);
}
void DSDMBEDecoder::initMbeParms()
{
mbe_initMbeParms(m_cur_mp, m_prev_mp, m_prev_mp_enhanced);
m_errs = 0;
m_errs2 = 0;
m_err_str[0] = 0;
if (m_auto_gain)
{
m_aout_gain = 25;
}
}
void DSDMBEDecoder::processFrame(char imbe_fr[8][23], char ambe_fr[4][24], char imbe7100_fr[7][24])
{
if (!m_dsdDecoder->m_mbelibEnable) {
return;
}
#ifdef DSD_USE_MBELIB
memset((void *) imbe_d, 0, 88);
if (m_dsdDecoder->m_mbeRate == DSDDecoder::DSDMBERate7200x4400)
{
mbe_processImbe7200x4400Framef(m_audio_out_temp_buf, &m_errs,
&m_errs2, m_err_str, imbe_fr, imbe_d, m_cur_mp,
m_prev_mp, m_prev_mp_enhanced, m_dsdDecoder->m_opts.uvquality);
}
else if (m_dsdDecoder->m_mbeRate == DSDDecoder::DSDMBERate7100x4400)
{
mbe_processImbe7100x4400Framef(m_audio_out_temp_buf, &m_errs,
&m_errs2, m_err_str, imbe7100_fr, imbe_d,
m_cur_mp, m_prev_mp, m_prev_mp_enhanced,
m_dsdDecoder->m_opts.uvquality);
}
else if (m_dsdDecoder->m_mbeRate == DSDDecoder::DSDMBERate3600x2400)
{
mbe_processAmbe3600x2400Framef(m_audio_out_temp_buf, &m_errs,
&m_errs2, m_err_str, ambe_fr, ambe_d, m_cur_mp,
m_prev_mp, m_prev_mp_enhanced, m_dsdDecoder->m_opts.uvquality);
}
else
{
mbe_processAmbe3600x2450Framef(m_audio_out_temp_buf, &m_errs,
&m_errs2, m_err_str, ambe_fr, ambe_d, m_cur_mp,
m_prev_mp, m_prev_mp_enhanced, m_dsdDecoder->m_opts.uvquality);
}
if (m_dsdDecoder->m_opts.errorbars == 1)
{
m_dsdDecoder->getLogger().log("%s", m_err_str);
}
processAudio();
#endif
}
void DSDMBEDecoder::processAudio()
{
int i, n;
float aout_abs, max, gainfactor, gaindelta, maxbuf;
if (m_auto_gain)
{
// detect max level
max = 0;
m_audio_out_temp_buf_p = m_audio_out_temp_buf;
for (n = 0; n < 160; n++)
{
aout_abs = fabsf(*m_audio_out_temp_buf_p);
if (aout_abs > max)
{
max = aout_abs;
}
m_audio_out_temp_buf_p++;
}
*m_aout_max_buf_p = max;
m_aout_max_buf_p++;
m_aout_max_buf_idx++;
if (m_aout_max_buf_idx > 24)
{
m_aout_max_buf_idx = 0;
m_aout_max_buf_p = m_aout_max_buf;
}
// lookup max history
for (i = 0; i < 25; i++)
{
maxbuf = m_aout_max_buf[i];
if (maxbuf > max)
{
max = maxbuf;
}
}
// determine optimal gain level
if (max > (float) 0)
{
gainfactor = ((float) 30000 / max);
}
else
{
gainfactor = (float) 50;
}
if (gainfactor < m_aout_gain)
{
m_aout_gain = gainfactor;
gaindelta = (float) 0;
}
else
{
if (gainfactor > (float) 50)
{
gainfactor = (float) 50;
}
gaindelta = gainfactor - m_aout_gain;
if (gaindelta > ((float) 0.05 * m_aout_gain))
{
gaindelta = ((float) 0.05 * m_aout_gain);
}
}
gaindelta /= (float) 160;
}
else
{
gaindelta = (float) 0;
}
// adjust output gain
m_audio_out_temp_buf_p = m_audio_out_temp_buf;
for (n = 0; n < 160; n++)
{
*m_audio_out_temp_buf_p = (m_aout_gain
+ ((float) n * gaindelta)) * (*m_audio_out_temp_buf_p);
m_audio_out_temp_buf_p++;
}
m_aout_gain += ((float) 160 * gaindelta);
// copy audio data to output buffer and upsample if necessary
m_audio_out_temp_buf_p = m_audio_out_temp_buf;
if ((m_upsample == 6) || (m_upsample == 7)) // upsampling to 48k
{
int upsampling = m_upsample;
if (m_audio_out_nb_samples + (160*upsampling) >= m_audio_out_buf_size)
{
resetAudio();
}
m_audio_out_float_buf_p = m_audio_out_float_buf;
for (n = 0; n < 160; n++)
{
upsample(upsampling, *m_audio_out_temp_buf_p);
m_audio_out_temp_buf_p++;
m_audio_out_float_buf_p += upsampling;
m_audio_out_idx += upsampling;
m_audio_out_idx2 += upsampling;
}
m_audio_out_float_buf_p = m_audio_out_float_buf;
// copy to output (short) buffer
for (n = 0; n < (160*upsampling); n++)
{
if (*m_audio_out_float_buf_p > (float) 32760)
{
*m_audio_out_float_buf_p = (float) 32760;
}
else if (*m_audio_out_float_buf_p < (float) -32760)
{
*m_audio_out_float_buf_p = (float) -32760;
}
if (m_stereo) // produce two channels
{
if (m_channels & 1) { // left channel
*m_audio_out_buf_p = (short) *m_audio_out_float_buf_p;
} else {
*m_audio_out_buf_p = 0;
}
m_audio_out_buf_p++;
if ((m_channels>>1) & 1) { // right channel
*m_audio_out_buf_p = (short) *m_audio_out_float_buf_p;
} else {
*m_audio_out_buf_p = 0;
}
m_audio_out_buf_p++;
}
else // single (mono) channel
{
*m_audio_out_buf_p = (short) *m_audio_out_float_buf_p;
m_audio_out_buf_p++;
}
m_audio_out_nb_samples++;
m_audio_out_float_buf_p++;
}
}
else // leave at 8k
{
if (m_audio_out_nb_samples + 160 >= m_audio_out_buf_size)
{
resetAudio();
}
m_audio_out_float_buf_p = m_audio_out_float_buf;
for (n = 0; n < 160; n++)
{
if (*m_audio_out_temp_buf_p > (float) 32760)
{
*m_audio_out_temp_buf_p = (float) 32760;
}
else if (*m_audio_out_temp_buf_p < (float) -32760)
{
*m_audio_out_temp_buf_p = (float) -32760;
}
*m_audio_out_buf_p = (short) *m_audio_out_temp_buf_p;
m_audio_out_buf_p++;
if (m_stereo) // produce second channel
{
*m_audio_out_buf_p = (short) *m_audio_out_float_buf_p;
m_audio_out_buf_p++;
}
m_audio_out_nb_samples++;
m_audio_out_temp_buf_p++;
m_audio_out_idx++;
m_audio_out_idx2++;
}
}
}
void DSDMBEDecoder::upsample(int upsampling, float invalue)
{
int i, j, sum;
float *outbuf1, c, d;
outbuf1 = m_audio_out_float_buf_p;
// outbuf1--;
// c = *outbuf1;
c = m_upsamplerLastValue;
d = invalue;
// basic triangle interpolation
// outbuf1++;
if (upsampling == 6)
{
*outbuf1 = ((invalue * (float) 0.166) + (c * (float) 0.834));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.332) + (c * (float) 0.668));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.5) + (c * (float) 0.5));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.668) + (c * (float) 0.332));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.834) + (c * (float) 0.166));
outbuf1++;
*outbuf1 = d;
m_upsamplerLastValue = d;
outbuf1++;
}
else if (upsampling == 7)
{
*outbuf1 = ((invalue * (float) 0.142) + (c * (float) 0.857));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.286) + (c * (float) 0.714));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.429) + (c * (float) 0.571));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.571) + (c * (float) 0.429));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.714) + (c * (float) 0.286));
outbuf1++;
*outbuf1 = ((invalue * (float) 0.857) + (c * (float) 0.142));
outbuf1++;
*outbuf1 = d;
m_upsamplerLastValue = d;
outbuf1++;
}
else // no upsampling
{
outbuf1++;
*outbuf1 = d;
outbuf1++;
}
outbuf1 -= upsampling;
// FIXME: this is all wrong! Now at least it does not corrupt audio_out_float_buf
// if (m_dsdDecoder->m_state.audio_out_idx2 > 24)
// {
// // smoothing
// outbuf1 -= 16;
// for (j = 0; j < 4; j++)
// {
// for (i = 0; i < m_upsampling; i++)
// {
// sum = 0;
// outbuf1 -= 2;
// sum += *outbuf1;
// outbuf1 += 2;
// sum += *outbuf1;
// outbuf1 += 2;
// sum += *outbuf1;
// outbuf1 -= 2;
// *outbuf1 = (sum / (float) 3);
// outbuf1++;
// }
// outbuf1 -= m_upsampling + 2;
// }
// }
}
}