mirror of https://github.com/dcoredump/dexed.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.3 KiB
53 lines
1.3 KiB
/*
|
|
* Copyright 2013 Google Inc.
|
|
*
|
|
* Licensed 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 __PITCHENV_H
|
|
#define __PITCHENV_H
|
|
|
|
// Computation of the DX7 pitch envelope
|
|
|
|
class PitchEnv {
|
|
public:
|
|
static void init(double sample_rate);
|
|
|
|
// The rates and levels arrays are calibrated to match the Dx7 parameters
|
|
// (ie, value 0..99).
|
|
void set(const int rates[4], const int levels[4]);
|
|
|
|
// Result is in Q24/octave
|
|
int32_t getsample();
|
|
void keydown(bool down);
|
|
void getPosition(char *step);
|
|
private:
|
|
static int unit_;
|
|
int rates_[4];
|
|
int levels_[4];
|
|
int32_t level_;
|
|
int targetlevel_;
|
|
bool rising_;
|
|
int ix_;
|
|
int inc_;
|
|
|
|
bool down_;
|
|
|
|
void advance(int newix);
|
|
};
|
|
|
|
extern const uint8_t pitchenv_rate[];
|
|
extern const int8_t pitchenv_tab[];
|
|
|
|
#endif // __PITCHENV_H
|
|
|
|
|