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examples/fmsynth: Add examples for FM synthesizer lib

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Add examples to show how to use fmsynth library.

There are 2 samples.
One is a music keyboard, and the other is music player decording MML.
This commit is contained in:
Takayoshi Koizumi
2022-08-16 09:03:39 +00:00
committed by Masayuki Ishikawa
parent 80eb94da8a
commit 4d86c69a22
10 changed files with 1565 additions and 0 deletions
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examples/fmsynth/operator_algorithm.c Normal file
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/****************************************************************************
* apps/examples/fmsynth/operator_algorithm.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stddef.h>
#include <audioutils/fmsynth.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* name: fmsynthutil_algorithm0
****************************************************************************/
FAR fmsynth_op_t *fmsynthutil_algorithm0(void)
{
/* [Simple sin operator]
*
* +--------------+
* | OP (carrier) | ----> Audio out
* +--------------+
*/
FAR fmsynth_op_t *carrier;
fmsynth_eglevels_t level;
/* Attack level and period time : 1.0, 40ms
* Decay Break level and period time : 0.3, 200ms
* Decay level and period time : 0.1, 100ms
* Sustain level and period time : 0.1, 100ms
* Release level : 0.0, 0ms
*
*/
level.attack.level = 1.0f;
level.attack.period_ms = 40;
level.decaybrk.level = 0.3f;
level.decaybrk.period_ms = 200;
level.decay.level = 0.1f;
level.decay.period_ms = 100;
level.sustain.level = 0.1f;
level.sustain.period_ms = 100;
level.release.level = 0.f;
level.release.period_ms = 0;
carrier = fmsynthop_create();
if (carrier)
{
fmsynthop_set_envelope(carrier, &level);
fmsynthop_select_opfunc(carrier, FMSYNTH_OPFUNC_SIN);
}
return carrier;
}
/****************************************************************************
* name: fmsynthutil_algorithm1
****************************************************************************/
FAR fmsynth_op_t *fmsynthutil_algorithm1(void)
{
/* feed back
* +--------------------+
* | |
* | +--------------+ |
* +->| OP (carrier) | -+--> Audio out
* +--------------+
*/
FAR fmsynth_op_t *carrier;
fmsynth_eglevels_t level;
level.attack.level = 1.0f;
level.attack.period_ms = 40;
level.decaybrk.level = 0.3f;
level.decaybrk.period_ms = 200;
level.decay.level = 0.1f;
level.decay.period_ms = 100;
level.sustain.level = 0.1f;
level.sustain.period_ms = 100;
level.release.level = 0.f;
level.release.period_ms = 0;
carrier = fmsynthop_create();
if (carrier)
{
fmsynthop_set_envelope(carrier, &level);
fmsynthop_select_opfunc(carrier, FMSYNTH_OPFUNC_SIN);
fmsynthop_bind_feedback(carrier, carrier, 0.6f);
}
return carrier;
}
/****************************************************************************
* name: fmsynthutil_algorithm2
****************************************************************************/
FAR fmsynth_op_t *fmsynthutil_algorithm2(void)
{
/* feed back
* +--------------------+
* | |
* | +--------------+ | +--------------+
* +->| OP (subop) | -+-> | OP (carrier) | ----> Audio out
* +--------------+ +--------------+
*/
FAR fmsynth_op_t *carrier;
FAR fmsynth_op_t *subop;
fmsynth_eglevels_t level;
level.attack.level = 1.0f;
level.attack.period_ms = 40;
level.decaybrk.level = 0.3f;
level.decaybrk.period_ms = 200;
level.decay.level = 0.1f;
level.decay.period_ms = 100;
level.sustain.level = 0.f;
level.sustain.period_ms = 0;
level.release.level = 0.f;
level.release.period_ms = 0;
carrier = fmsynthop_create();
if (carrier)
{
subop = fmsynthop_create();
if (!subop)
{
fmsynthop_delete(carrier);
return NULL;
}
fmsynthop_set_envelope(carrier, &level);
fmsynthop_select_opfunc(carrier, FMSYNTH_OPFUNC_SIN);
fmsynthop_set_soundfreqrate(subop, 3.7f);
fmsynthop_select_opfunc(subop, FMSYNTH_OPFUNC_SIN);
fmsynthop_cascade_subop(carrier, subop);
}
return carrier;
}
/****************************************************************************
* name: fmsynthutil_delete_ops
****************************************************************************/
void FAR fmsynthutil_delete_ops(FAR fmsynth_op_t *op)
{
FAR fmsynth_op_t *tmp;
while (op != NULL)
{
tmp = op->parallelop;
if (op->cascadeop)
{
fmsynthutil_delete_ops(op->cascadeop);
}
fmsynthop_delete(op);
op = tmp;
}
}