169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
|
|
/*******************************************************************************/
|
|
/* Copyright (C) 2008 Jonathan Moore Liles */
|
|
/* */
|
|
/* 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; see the file COPYING. If not,write to the Free Software */
|
|
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
/*******************************************************************************/
|
|
|
|
/* General DSP related functions. */
|
|
|
|
#include "dsp.h"
|
|
#include "string.h" // for memset.
|
|
|
|
/* TODO: these functions are all targets for optimization (SSE?) */
|
|
|
|
void
|
|
buffer_apply_gain ( sample_t *buf, nframes_t nframes, float g )
|
|
{
|
|
if ( g != 1.0f )
|
|
while ( nframes-- )
|
|
*(buf++) *= g;
|
|
}
|
|
|
|
void
|
|
buffer_apply_gain_buffer ( sample_t *buf, const sample_t *gainbuf, nframes_t nframes )
|
|
{
|
|
while ( nframes-- )
|
|
*(buf++) *= *(gainbuf++);
|
|
}
|
|
|
|
void
|
|
buffer_copy_and_apply_gain_buffer ( sample_t *dst, const sample_t *src, const sample_t *gainbuf, nframes_t nframes )
|
|
{
|
|
while ( nframes-- )
|
|
*(dst++) = *(src++) * *(gainbuf++);
|
|
}
|
|
|
|
void
|
|
buffer_mix ( sample_t *dst, const sample_t *src, nframes_t nframes )
|
|
{
|
|
while ( nframes-- )
|
|
*(dst++) += *(src++);
|
|
}
|
|
|
|
void
|
|
buffer_mix_with_gain ( sample_t *dst, const sample_t *src, nframes_t nframes, float g )
|
|
{
|
|
while ( nframes-- )
|
|
*(dst++) += *(src++) * g;
|
|
}
|
|
|
|
void
|
|
buffer_interleave_one_channel ( sample_t *dst, const sample_t *src, int channel, int channels, nframes_t nframes )
|
|
{
|
|
dst += channel;
|
|
|
|
while ( nframes-- )
|
|
{
|
|
*dst = *(src++);
|
|
dst += channels;
|
|
}
|
|
}
|
|
|
|
void
|
|
buffer_interleave_one_channel_and_mix ( sample_t *dst, const sample_t *src, int channel, int channels, nframes_t nframes )
|
|
{
|
|
dst += channel;
|
|
|
|
while ( nframes-- )
|
|
{
|
|
*dst += *(src++);
|
|
dst += channels;
|
|
}
|
|
}
|
|
|
|
void
|
|
buffer_deinterleave_one_channel ( sample_t *dst, const sample_t *src, int channel, int channels, nframes_t nframes )
|
|
{
|
|
src += channel;
|
|
|
|
while ( nframes-- )
|
|
{
|
|
*(dst++) = *src;
|
|
src += channels;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
buffer_fill_with_silence ( sample_t *buf, nframes_t nframes )
|
|
{
|
|
memset( buf, 0, nframes * sizeof( sample_t ) );
|
|
}
|
|
|
|
bool
|
|
buffer_is_digital_black ( sample_t *buf, nframes_t nframes )
|
|
{
|
|
while ( nframes-- )
|
|
{
|
|
if ( 0 != buf[nframes] )
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
buffer_copy ( sample_t *dst, const sample_t *src, nframes_t nframes )
|
|
{
|
|
memcpy( dst, src, nframes * sizeof( sample_t ) );
|
|
}
|
|
|
|
void
|
|
buffer_copy_and_apply_gain ( sample_t *dst, const sample_t *src, nframes_t nframes, float gain )
|
|
{
|
|
memcpy( dst, src, nframes * sizeof( sample_t ) );
|
|
buffer_apply_gain( dst, nframes, gain );
|
|
}
|
|
|
|
void
|
|
Value_Smoothing_Filter::sample_rate ( nframes_t n )
|
|
{
|
|
const float FS = n;
|
|
const float T = 0.05f;
|
|
|
|
w = _cutoff / (FS * T);
|
|
}
|
|
|
|
bool
|
|
Value_Smoothing_Filter::apply( sample_t *dst, nframes_t nframes, float gt )
|
|
{
|
|
const float a = 0.07f;
|
|
const float b = 1 + a;
|
|
|
|
const float gm = b * gt;
|
|
|
|
float g1 = this->g1;
|
|
float g2 = this->g2;
|
|
|
|
if ( target_reached(gt) )
|
|
return false;
|
|
|
|
for (nframes_t i = 0; i < nframes; i++)
|
|
{
|
|
g1 += w * (gm - g1 - a * g2);
|
|
g2 += w * (g1 - g2);
|
|
dst[i] = g2;
|
|
}
|
|
|
|
if ( fabsf( gt - g2 ) < 0.0001f )
|
|
g2 = gt;
|
|
|
|
this->g1 = g1;
|
|
this->g2 = g2;
|
|
|
|
return true;
|
|
}
|