* apps/include/audioutils/fmsynth_eg.h
*
* 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.
*
****************************************************************************/
#ifndef __APPS_INCLUDE_AUDIOUTILS_FMSYNTH_EG_H
#define __APPS_INCLUDE_AUDIOUTILS_FMSYNTH_EG_H
* Included Files
****************************************************************************/
#include <limits.h>
* Pre-processor Definitions
****************************************************************************/
#define FMSYNTH_MAX_EGLEVEL (SHRT_MAX / 8)
#define EGSTATE_ATTACK (0)
#define EGSTATE_DECAYBREAK (1)
#define EGSTATE_DECAY (2)
#define EGSTATE_SUSTAIN (3)
#define EGSTATE_RELEASE (4)
#define EGSTATE_RELEASED (5)
#define EGSTATE_MAX (6)
#define EGSTATE_NUM EGSTATE_RELEASED
* Public Types
****************************************************************************/
struct fmsynth_eglevel_s
{
float level;
int period_ms;
};
typedef struct fmsynth_eglevels_s
{
struct fmsynth_eglevel_s attack;
struct fmsynth_eglevel_s decaybrk;
struct fmsynth_eglevel_s decay;
struct fmsynth_eglevel_s sustain;
struct fmsynth_eglevel_s release;
} fmsynth_eglevels_t;
typedef struct fmsynth_egparam_s
{
int initval;
int period;
int diff2next;
} fmsynth_egparam_t;
typedef struct fmsynth_eg_s
{
int state;
int state_counter;
fmsynth_egparam_t state_params[EGSTATE_MAX];
} fmsynth_eg_t;
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
extern "C"
{
#endif
FAR fmsynth_eg_t *create_fmsyntheg(fmsynth_eg_t *eg);
FAR fmsynth_eg_t *fmsyntheg_create(void);
void fmsyntheg_delete(FAR fmsynth_eg_t *eg);
int fmsyntheg_set_param(FAR fmsynth_eg_t *eg,
int fs, FAR fmsynth_eglevels_t *levels);
void fmsyntheg_start(FAR fmsynth_eg_t *eg);
void fmsyntheg_stop(FAR fmsynth_eg_t *eg);
int fmsyntheg_operate(FAR fmsynth_eg_t *eg);
#ifdef __cplusplus
}
#endif
#endif