non/nonlib/dsp.C

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/*******************************************************************************/
/* 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"
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#include "string.h" // for memset.
#include <stdlib.h>
static const int ALIGNMENT = 16;
#ifdef HAS_BUILTIN_ASSUME_ALIGNED
#define assume_aligned(x) __builtin_assume_aligned(x,ALIGNMENT)
#else
#define assume_aligned(x) (x)
#endif
sample_t *
buffer_alloc ( nframes_t size )
{
void *p;
posix_memalign( &p, ALIGNMENT, size * sizeof( sample_t ) );
return (sample_t*)p;
}
void
buffer_apply_gain ( sample_t * __restrict__ buf, nframes_t nframes, float g )
{
sample_t * buf_ = (sample_t*) assume_aligned(buf);
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if ( g == 1.0f )
return;
for ( nframes_t i = 0; i < nframes; i++ )
buf_[i] *= g;
}
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void
buffer_apply_gain_unaligned ( sample_t * __restrict__ buf, nframes_t nframes, float g )
{
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if ( g == 1.0f )
return;
for ( nframes_t i = 0; i < nframes; i++ )
buf[i] *= g;
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}
void
buffer_apply_gain_buffer ( sample_t * __restrict__ buf, const sample_t * __restrict__ gainbuf, nframes_t nframes )
{
sample_t * buf_ = (sample_t*) assume_aligned(buf);
const sample_t * gainbuf_ = (const sample_t*) assume_aligned(gainbuf);
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for ( nframes_t i = 0; i < nframes; i++ )
buf_[i] *= gainbuf_[i];
}
void
buffer_copy_and_apply_gain_buffer ( sample_t * __restrict__ dst, const sample_t * __restrict__ src, const sample_t * __restrict__ gainbuf, nframes_t nframes )
{
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const sample_t * src_ = (const sample_t*) assume_aligned(src);
const sample_t * gainbuf_ = (const sample_t*) assume_aligned(gainbuf);
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for ( nframes_t i = 0; i < nframes; i++ )
dst_[i] = src_[i] * gainbuf_[i];
}
void
buffer_mix ( sample_t * __restrict__ dst, const sample_t * __restrict__ src, nframes_t nframes )
{
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const sample_t * src_ = (const sample_t*) assume_aligned(src);
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for ( nframes_t i = 0; i < nframes; i++ )
dst_[i] += src_[i];
}
void
buffer_mix_with_gain ( sample_t * __restrict__ dst, const sample_t * __restrict__ src, nframes_t nframes, float g )
{
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const sample_t * src_ = (const sample_t*) assume_aligned(src);
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for ( nframes_t i = 0; i < nframes; i++ )
dst_[i] += src_[i] * g;
}
void
buffer_interleave_one_channel ( sample_t * __restrict__ dst, const sample_t * __restrict__ 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 *__restrict__ dst, const sample_t * __restrict__ src, int channel, int channels, nframes_t nframes )
{
dst += channel;
while ( nframes-- )
{
*dst += *(src++);
dst += channels;
}
}
void
buffer_deinterleave_one_channel ( sample_t * __restrict__ dst, const sample_t * __restrict__ src, int channel, int channels, nframes_t nframes )
{
src += channel;
while ( nframes-- )
{
*(dst++) = *src;
src += channels;
}
}
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void
buffer_interleaved_mix ( sample_t *__restrict__ dst, const sample_t * __restrict__ src, int dst_channel, int src_channel, int dst_channels, int src_channels, nframes_t nframes )
{
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const sample_t * src_ = (const sample_t*) assume_aligned(src);
dst_ += dst_channel;
src_ += src_channel;
while ( nframes-- )
{
*dst_ += *src_;
dst_ += dst_channels;
src_ += src_channels;
}
}
void
buffer_interleaved_copy ( sample_t *__restrict__ dst, const sample_t * __restrict__ src, int dst_channel, int src_channel, int dst_channels, int src_channels, nframes_t nframes )
{
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const sample_t * src_ = (const sample_t*) assume_aligned(src);
dst_ += dst_channel;
src_ += src_channel;
while ( nframes-- )
{
*dst_ = *src_;
dst_ += dst_channels;
src_ += src_channels;
}
}
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void
buffer_fill_with_silence ( sample_t *buf, nframes_t nframes )
{
memset( buf, 0, nframes * sizeof( sample_t ) );
}
bool
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buffer_is_digital_black ( const sample_t *buf, nframes_t nframes )
{
while ( nframes-- )
{
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if (! *(buf++) )
continue;
return false;
}
return true;
}
float
buffer_get_peak ( const sample_t * __restrict__ buf, nframes_t nframes )
{
const sample_t * buf_ = (const sample_t*) assume_aligned(buf);
float p = 0.0f;
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while (nframes--)
{
const float v = fabsf( *buf_++ );
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if ( v > p )
p = v;
}
return p;
}
void
buffer_copy ( sample_t * __restrict__ dst, const sample_t * __restrict__ src, nframes_t nframes )
{
memcpy( dst, src, nframes * sizeof( sample_t ) );
}
void
buffer_copy_and_apply_gain ( sample_t * __restrict__ dst, const sample_t * __restrict__ 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;
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w = _cutoff / (FS * T);
}
/* FIXME: need a method that just returns a single value, skipping the within-buffer interpolation */
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bool
Value_Smoothing_Filter::apply( sample_t * __restrict__ dst, nframes_t nframes, float gt )
{
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if ( target_reached(gt) )
return false;
sample_t * dst_ = (sample_t*) assume_aligned(dst);
const float a = 0.07f;
const float b = 1 + a;
const float gm = b * gt;
float g1 = this->g1;
float g2 = this->g2;
for (nframes_t i = 0; i < nframes; i++)
{
g1 += w * (gm - g1 - a * g2);
g2 += w * (g1 - g2);
dst_[i] = g2;
}
g2 += 1e-10f; /* denormal protection */
if ( fabsf( gt - g2 ) < 0.0001f )
g2 = gt;
this->g1 = g1;
this->g2 = g2;
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return true;
}