non/Timeline/Engine/dsp.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, sample_t *gainbuf, nframes_t nframes )
{
    while ( nframes-- )
        *(buf++) *= *(gainbuf++);
}

void
buffer_mix ( sample_t *dst, sample_t *src, nframes_t nframes )
{
    while ( nframes-- )
        *(dst++) += *(src++);
}

void
buffer_mix_with_gain ( sample_t *dst, sample_t *src, nframes_t nframes, float g )
{
    while ( nframes-- )
        *(dst++) += *(src++) * g;
}

void
buffer_interleave_one_channel ( sample_t *dst, 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, 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, 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;
}