/usr/include/libroardsp/synth.h is in libroar-dev 1.0~beta11-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2014
*
* This file is part of libroar a part of RoarAudio,
* a cross-platform sound system for both, home and professional use.
* See README for details.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3
* as published by the Free Software Foundation.
*
* libroar 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* NOTE for everyone want's to change something and send patches:
* read README and HACKING! There a addition information on
* the license of this document you need to read before you send
* any patches.
*
* NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
* or libpulse*:
* The libs libroaresd, libroararts and libroarpulse link this lib
* and are therefore GPL. Because of this it may be illigal to use
* them with any software that uses libesd, libartsc or libpulse*.
*/
#ifndef _LIBROARDSP_SYNTH_H_
#define _LIBROARDSP_SYNTH_H_
#include "libroardsp.h"
#define ROAR_SYNTH_FUNC_TYPE(name) float (*name)(float t, struct roar_synth_state * state)
#define ROAR_SYNTH_FUNC_CAST(name) ((float (* )(float t, struct roar_synth_state * state)) name)
// SYNF -> Synthesis Function
#define ROAR_SYNTH_SYNF_RECT ROAR_SYNTH_FUNC_CAST(roar_synth_synf_rect)
#define ROAR_SYNTH_SYNF_SAW ROAR_SYNTH_FUNC_CAST(roar_synth_synf_saw)
#define ROAR_SYNTH_SYNF_TRI ROAR_SYNTH_FUNC_CAST(roar_synth_synf_tri)
#define ROAR_SYNTH_SYNF_TRAP ROAR_SYNTH_FUNC_CAST(roar_synth_synf_trap)
// those use sin*()
#ifdef ROAR_HAVE_LIBM
#define ROAR_SYNTH_SYNF_SIN ROAR_SYNTH_FUNC_CAST(sinf)
#define ROAR_SYNTH_SYNF_S2S ROAR_SYNTH_FUNC_CAST(roar_synth_synf_s2s)
#endif
#ifdef ROAR_HAVE_LIBM
#define ROAR_SYNTH_SYNF_DEFAULT ROAR_SYNTH_SYNF_SIN
#else
#define ROAR_SYNTH_SYNF_DEFAULT ROAR_SYNTH_SYNF_TRAP
#endif
struct roar_synth_state {
int rate;
struct roar_note_octave * note;
ROAR_SYNTH_FUNC_TYPE(func);
size_t pcmoffset;
float volume;
};
int roar_synth_init(struct roar_synth_state * state, struct roar_note_octave * note, int rate);
int roar_synth_set_offset(struct roar_synth_state * state, size_t offset);
int roar_synth_set_func (struct roar_synth_state * state, ROAR_SYNTH_FUNC_TYPE(func));
int roar_synth_set_volume(struct roar_synth_state * state, float volume);
int roar_synth_pcmout_i16n(struct roar_synth_state * state, int16_t * out, size_t frames, int channels);
int roar_synth_pcmout_i161(struct roar_synth_state * state, int16_t * out, size_t frames);
// some basic SYNFs:
float roar_synth_synf_rect (float t, struct roar_synth_state * state);
float roar_synth_synf_saw (float t, struct roar_synth_state * state);
float roar_synth_synf_tri (float t, struct roar_synth_state * state);
float roar_synth_synf_trap (float t, struct roar_synth_state * state);
#ifdef ROAR_HAVE_LIBM
float roar_synth_synf_s2s (float t, struct roar_synth_state * state);
#endif
#endif
//ll
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