362 lines
6.9 KiB
C++
362 lines
6.9 KiB
C++
// ------------------------------------------------------------------------
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//
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// Copyright (C) 2010-2011 Fons Adriaensen <fons@linuxaudio.org>
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// Copyright (C) 2015 Robin Gareus <robin@gareus.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// ------------------------------------------------------------------------
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#include "ebu_r128_proc.h"
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#include <math.h>
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#include <string.h>
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#ifdef COMPILER_MSVC
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#include <float.h>
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// C99 'isfinite()' is not available in MSVC.
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#define isfinite_local(val) (bool)_finite((double)val)
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#else
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#define isfinite_local isfinite
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#endif
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using namespace FonsEBU;
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float Ebu_r128_proc::Ebu_r128_hist::_bin_power[100] = { 0.0f };
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float Ebu_r128_proc::_chan_gain[5] = { 1.0f, 1.0f, 1.0f, 1.41f, 1.41f };
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Ebu_r128_proc::Ebu_r128_hist::Ebu_r128_hist ()
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{
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_histc = new int[751];
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initstat ();
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reset ();
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}
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Ebu_r128_proc::Ebu_r128_hist::~Ebu_r128_hist ()
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{
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delete[] _histc;
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}
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void
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Ebu_r128_proc::Ebu_r128_hist::reset ()
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{
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memset (_histc, 0, 751 * sizeof (float));
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_count = 0;
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_error = 0;
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}
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void
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Ebu_r128_proc::Ebu_r128_hist::initstat ()
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{
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if (_bin_power[0])
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return;
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for (int i = 0; i < 100; i++) {
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_bin_power[i] = powf (10.0f, i / 100.0f);
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}
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}
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void
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Ebu_r128_proc::Ebu_r128_hist::addpoint (float v)
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{
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int k = (int)floorf (10 * v + 700.5f);
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if (k < 0)
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return;
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if (k > 750) {
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k = 750;
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_error++;
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}
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_histc[k]++;
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_count++;
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}
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float
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Ebu_r128_proc::Ebu_r128_hist::integrate (int i)
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{
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int j, k, n;
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float s;
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j = i % 100;
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n = 0;
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s = 0;
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while (i <= 750) {
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k = _histc[i++];
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n += k;
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s += k * _bin_power[j++];
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if (j == 100) {
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j = 0;
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s /= 10.0f;
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}
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}
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return s / n;
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}
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void
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Ebu_r128_proc::Ebu_r128_hist::calc_integ (float* vi, float* th)
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{
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int k;
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float s;
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if (_count < 50) {
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*vi = -200.0f;
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return;
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}
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s = integrate (0);
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// Original threshold was -8 dB below result of first integration
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// if (th) *th = 10 * log10f (s) - 8.0f;
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// k = (int)(floorf (100 * log10f (s) + 0.5f)) + 620;
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// Threshold redefined to -10 dB below result of first integration
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if (th) {
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*th = 10 * log10f (s) - 10.0f;
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}
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k = (int)(floorf (100 * log10f (s) + 0.5f)) + 600;
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if (k < 0) {
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k = 0;
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}
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s = integrate (k);
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*vi = 10 * log10f (s);
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}
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void
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Ebu_r128_proc::Ebu_r128_hist::calc_range (float* v0, float* v1, float* th)
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{
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int i, j, k, n;
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float a, b, s;
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if (_count < 20) {
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*v0 = -200.0f;
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*v1 = -200.0f;
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return;
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}
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s = integrate (0);
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if (th) {
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*th = 10 * log10f (s) - 20.0f;
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}
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k = (int)(floorf (100 * log10f (s) + 0.5)) + 500;
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if (k < 0) {
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k = 0;
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}
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for (i = k, n = 0; i <= 750; i++) {
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n += _histc[i];
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}
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a = 0.10f * n;
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b = 0.95f * n;
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for (i = k, s = 0; s < a; i++) {
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s += _histc[i];
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}
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for (j = 750, s = n; s > b; j--) {
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s -= _histc[j];
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}
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*v0 = (i - 701) / 10.0f;
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*v1 = (j - 699) / 10.0f;
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}
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Ebu_r128_proc::Ebu_r128_proc ()
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{
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reset ();
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}
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Ebu_r128_proc::~Ebu_r128_proc ()
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{
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}
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void
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Ebu_r128_proc::init (int nchan, float fsamp)
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{
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_nchan = nchan;
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_fsamp = fsamp;
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_fragm = (int)fsamp / 20;
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detect_init (_fsamp);
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reset ();
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}
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void
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Ebu_r128_proc::reset ()
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{
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_integr = false;
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_frcnt = _fragm;
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_frpwr = 1e-30f;
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_wrind = 0;
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_div1 = 0;
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_div2 = 0;
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_loudness_M = -200.0f;
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_loudness_S = -200.0f;
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memset (_power, 0, 64 * sizeof (float));
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integr_reset ();
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detect_reset ();
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}
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void
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Ebu_r128_proc::integr_reset ()
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{
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_hist_M.reset ();
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_hist_S.reset ();
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_maxloudn_M = -200.0f;
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_maxloudn_S = -200.0f;
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_integrated = -200.0f;
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_integ_thr = -200.0f;
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_range_min = -200.0f;
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_range_max = -200.0f;
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_range_thr = -200.0f;
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_div1 = _div2 = 0;
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}
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void
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Ebu_r128_proc::process (int nfram, const float* const* input)
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{
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int i, k;
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for (i = 0; i < _nchan; i++) {
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_ipp[i] = input[i];
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}
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while (nfram) {
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k = (_frcnt < nfram) ? _frcnt : nfram;
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_frpwr += detect_process (k);
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_frcnt -= k;
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if (_frcnt == 0) {
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_power[_wrind++] = _frpwr / _fragm;
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_frcnt = _fragm;
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_frpwr = 1e-30f;
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_wrind &= 63;
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_loudness_M = addfrags (8);
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_loudness_S = addfrags (60);
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if (!isfinite_local (_loudness_M) || _loudness_M < -200.f) {
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_loudness_M = -200.0f;
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}
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if (!isfinite_local (_loudness_S) || _loudness_S < -200.f) {
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_loudness_S = -200.0f;
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}
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if (_loudness_M > _maxloudn_M) {
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_maxloudn_M = _loudness_M;
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}
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if (_loudness_S > _maxloudn_S) {
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_maxloudn_S = _loudness_S;
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}
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if (_integr) {
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if (++_div1 == 2) {
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_hist_M.addpoint (_loudness_M);
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_div1 = 0;
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}
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if (++_div2 == 10) {
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_hist_S.addpoint (_loudness_S);
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_div2 = 0;
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_hist_M.calc_integ (&_integrated, &_integ_thr);
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_hist_S.calc_range (&_range_min, &_range_max, &_range_thr);
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}
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}
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}
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for (i = 0; i < _nchan; i++) {
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_ipp[i] += k;
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}
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nfram -= k;
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}
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}
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float
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Ebu_r128_proc::addfrags (int nfrag)
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{
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int i, k;
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float s;
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s = 0;
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k = (_wrind - nfrag) & 63;
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for (i = 0; i < nfrag; i++) {
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s += _power[(i + k) & 63];
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}
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return -0.6976f + 10 * log10f (s / nfrag);
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}
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void
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Ebu_r128_proc::detect_init (float fsamp)
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{
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float a, b, c, d, r, u1, u2, w1, w2;
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r = 1 / tan (4712.3890f / fsamp);
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w1 = r / 1.12201f;
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w2 = r * 1.12201f;
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u1 = u2 = 1.4085f + 210.0f / fsamp;
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a = u1 * w1;
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b = w1 * w1;
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c = u2 * w2;
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d = w2 * w2;
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r = 1 + a + b;
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_a0 = (1 + c + d) / r;
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_a1 = (2 - 2 * d) / r;
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_a2 = (1 - c + d) / r;
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_b1 = (2 - 2 * b) / r;
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_b2 = (1 - a + b) / r;
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r = 48.0f / fsamp;
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a = 4.9886075f * r;
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b = 6.2298014f * r * r;
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r = 1 + a + b;
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a *= 2 / r;
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b *= 4 / r;
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_c3 = a + b;
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_c4 = b;
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r = 1.004995f / r;
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_a0 *= r;
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_a1 *= r;
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_a2 *= r;
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}
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void
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Ebu_r128_proc::detect_reset ()
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{
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for (int i = 0; i < MAXCH; i++)
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_fst[i].reset ();
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}
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float
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Ebu_r128_proc::detect_process (int nfram)
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{
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int i, j;
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float si, sj;
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float x, y, z1, z2, z3, z4;
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float const* p;
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Ebu_r128_fst* S;
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si = 0;
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for (i = 0, S = _fst; i < _nchan; i++, S++) {
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z1 = S->_z1;
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z2 = S->_z2;
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z3 = S->_z3;
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z4 = S->_z4;
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p = _ipp[i];
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sj = 0;
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for (j = 0; j < nfram; j++) {
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x = p[j] - _b1 * z1 - _b2 * z2 + 1e-15f;
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y = _a0 * x + _a1 * z1 + _a2 * z2 - _c3 * z3 - _c4 * z4;
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z2 = z1;
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z1 = x;
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z4 += z3;
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z3 += y;
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sj += y * y;
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}
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si += _chan_gain[i] * sj;
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S->_z1 = !isfinite_local (z1) ? 0 : z1;
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S->_z2 = !isfinite_local (z2) ? 0 : z2;
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S->_z3 = !isfinite_local (z3) ? 0 : z3;
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S->_z4 = !isfinite_local (z4) ? 0 : z4;
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}
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return si;
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}
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