+++ /dev/null
-// ------------------------------------------------------------------------
-//
-// Copyright (C) 2010-2011 Fons Adriaensen <fons@linuxaudio.org>
-//
-// 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; either version 2 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 for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-//
-// ------------------------------------------------------------------------
-
-
-#include "ebu_r128_proc.h"
-
-#include <string.h>
-#include <cmath>
-
-
-float Ebu_r128_hist::_bin_power [100] = { 0.0f };
-float Ebu_r128_proc::_chan_gain [5] = { 1.0f, 1.0f, 1.0f, 1.41f, 1.41f };
-
-
-Ebu_r128_hist::Ebu_r128_hist (void)
-{
- _histc = new int [751];
- initstat ();
- reset ();
-}
-
-
-Ebu_r128_hist::~Ebu_r128_hist (void)
-{
- delete[] _histc;
-}
-
-
-void Ebu_r128_hist::reset (void)
-{
- memset (_histc, 0, 751 * sizeof (float));
- _count = 0;
- _error = 0;
-}
-
-
-void Ebu_r128_hist::initstat (void)
-{
- int i;
-
- if (_bin_power [0]) return;
- for (i = 0; i < 100; i++)
- {
- _bin_power [i] = powf (10.0f, i / 100.0f);
- }
-}
-
-
-void Ebu_r128_hist::addpoint (float v)
-{
- int k;
-
- k = (int) floorf (10 * v + 700.5f);
- if (k < 0) return;
- if (k > 750)
- {
- k = 750;
- _error++;
- }
- _histc [k]++;
- _count++;
-}
-
-
-float Ebu_r128_hist::integrate (int i)
-{
- int j, k, n;
- float s;
-
- j = i % 100;
- n = 0;
- s = 0;
- while (i <= 750)
- {
- k = _histc [i++];
- n += k;
- s += k * _bin_power [j++];
- if (j == 100)
- {
- j = 0;
- s /= 10.0f;
- }
- }
- return s / n;
-}
-
-
-void Ebu_r128_hist::calc_integ (float *vi, float *th)
-{
- int k;
- float s;
-
- if (_count < 50)
- {
- *vi = -200.0f;
- return;
- }
- s = integrate (0);
-// Original threshold was -8 dB below result of first integration
-// if (th) *th = 10 * log10f (s) - 8.0f;
-// k = (int)(floorf (100 * log10f (s) + 0.5f)) + 620;
-// Threshold redefined to -10 dB below result of first integration
- if (th) *th = 10 * log10f (s) - 10.0f;
- k = (int)(floorf (100 * log10f (s) + 0.5f)) + 600;
- if (k < 0) k = 0;
- s = integrate (k);
- *vi = 10 * log10f (s);
-}
-
-
-void Ebu_r128_hist::calc_range (float *v0, float *v1, float *th)
-{
- int i, j, k, n;
- float a, b, s;
-
- if (_count < 20)
- {
- *v0 = -200.0f;
- *v1 = -200.0f;
- return;
- }
- s = integrate (0);
- if (th) *th = 10 * log10f (s) - 20.0f;
- k = (int)(floorf (100 * log10f (s) + 0.5)) + 500;
- if (k < 0) k = 0;
- for (i = k, n = 0; i <= 750; i++) n += _histc [i];
- a = 0.10f * n;
- b = 0.95f * n;
- for (i = k, s = 0; s < a; i++) s += _histc [i];
- for (j = 750, s = n; s > b; j--) s -= _histc [j];
- *v0 = (i - 701) / 10.0f;
- *v1 = (j - 699) / 10.0f;
-}
-
-
-
-
-Ebu_r128_proc::Ebu_r128_proc (void)
-{
- reset ();
-}
-
-
-Ebu_r128_proc::~Ebu_r128_proc (void)
-{
-}
-
-
-void Ebu_r128_proc::init (int nchan, float fsamp)
-{
- _nchan = nchan;
- _fsamp = fsamp;
- _fragm = (int) fsamp / 20;
- detect_init (_fsamp);
- reset ();
-}
-
-
-void Ebu_r128_proc::reset (void)
-{
- _integr = false;
- _frcnt = _fragm;
- _frpwr = 1e-30f;
- _wrind = 0;
- _div1 = 0;
- _div2 = 0;
- _loudness_M = -200.0f;
- _loudness_S = -200.0f;
- memset (_power, 0, 64 * sizeof (float));
- integr_reset ();
- detect_reset ();
-}
-
-
-void Ebu_r128_proc::integr_reset (void)
-{
- _hist_M.reset ();
- _hist_S.reset ();
- _maxloudn_M = -200.0f;
- _maxloudn_S = -200.0f;
- _integrated = -200.0f;
- _integ_thr = -200.0f;
- _range_min = -200.0f;
- _range_max = -200.0f;
- _range_thr = -200.0f;
- _div1 = _div2 = 0;
-}
-
-
-void Ebu_r128_proc::process (int nfram, float *input [])
-{
- int i, k;
-
- for (i = 0; i < _nchan; i++) _ipp [i] = input [i];
- while (nfram)
- {
- k = (_frcnt < nfram) ? _frcnt : nfram;
- _frpwr += detect_process (k);
- _frcnt -= k;
- if (_frcnt == 0)
- {
- _power [_wrind++] = _frpwr / _fragm;
- _frcnt = _fragm;
- _frpwr = 1e-30f;
- _wrind &= 63;
- _loudness_M = addfrags (8);
- _loudness_S = addfrags (60);
- if (_loudness_M > _maxloudn_M) _maxloudn_M = _loudness_M;
- if (_loudness_S > _maxloudn_S) _maxloudn_S = _loudness_S;
- if (_integr)
- {
- if (++_div1 == 2)
- {
- _hist_M.addpoint (_loudness_M);
- _div1 = 0;
- }
- if (++_div2 == 10)
- {
- _hist_S.addpoint (_loudness_S);
- _div2 = 0;
- _hist_M.calc_integ (&_integrated, &_integ_thr);
- _hist_S.calc_range (&_range_min, &_range_max, &_range_thr);
- }
- }
- }
- for (i = 0; i < _nchan; i++) _ipp [i] += k;
- nfram -= k;
- }
-}
-
-
-float Ebu_r128_proc::addfrags (int nfrag)
-{
- int i, k;
- float s;
-
- s = 0;
- k = (_wrind - nfrag) & 63;
- for (i = 0; i < nfrag; i++) s += _power [(i + k) & 63];
- return -0.6976f + 10 * log10f (s / nfrag);
-}
-
-
-void Ebu_r128_proc::detect_init (float fsamp)
-{
- float a, b, c, d, r, u1, u2, w1, w2;
-
- r = 1 / tan (4712.3890f / fsamp);
- w1 = r / 1.12201f;
- w2 = r * 1.12201f;
- u1 = u2 = 1.4085f + 210.0f / fsamp;
- a = u1 * w1;
- b = w1 * w1;
- c = u2 * w2;
- d = w2 * w2;
- r = 1 + a + b;
- _a0 = (1 + c + d) / r;
- _a1 = (2 - 2 * d) / r;
- _a2 = (1 - c + d) / r;
- _b1 = (2 - 2 * b) / r;
- _b2 = (1 - a + b) / r;
- r = 48.0f / fsamp;
- a = 4.9886075f * r;
- b = 6.2298014f * r * r;
- r = 1 + a + b;
- a *= 2 / r;
- b *= 4 / r;
- _c3 = a + b;
- _c4 = b;
- r = 1.004995f / r;
- _a0 *= r;
- _a1 *= r;
- _a2 *= r;
-}
-
-
-void Ebu_r128_proc::detect_reset (void)
-{
- for (int i = 0; i < MAXCH; i++) _fst [i].reset ();
-}
-
-
-float Ebu_r128_proc::detect_process (int nfram)
-{
- int i, j;
- float si, sj;
- float x, y, z1, z2, z3, z4;
- float *p;
- Ebu_r128_fst *S;
-
- si = 0;
- for (i = 0, S = _fst; i < _nchan; i++, S++)
- {
- z1 = S->_z1;
- z2 = S->_z2;
- z3 = S->_z3;
- z4 = S->_z4;
- p = _ipp [i];
- sj = 0;
- for (j = 0; j < nfram; j++)
- {
- x = p [j] - _b1 * z1 - _b2 * z2 + 1e-15f;
- y = _a0 * x + _a1 * z1 + _a2 * z2 - _c3 * z3 - _c4 * z4;
- z2 = z1;
- z1 = x;
- z4 += z3;
- z3 += y;
- sj += y * y;
- }
- if (_nchan == 1) si = 2 * sj;
- else si += _chan_gain [i] * sj;
- S->_z1 = z1;
- S->_z2 = z2;
- S->_z3 = z3;
- S->_z4 = z4;
- }
- return si;
-}
-
-
-
projects / nageru / blobdiff