mirror of
https://github.com/mfulz/qmk_firmware.git
synced 2025-10-30 21:02:32 +01:00
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
// midi for embedded chips,
|
|
// Copyright 2010 Alex Norman
|
|
//
|
|
// This file is part of avr-midi.
|
|
//
|
|
// avr-midi 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 3 of the License, or
|
|
//(at your option) any later version.
|
|
//
|
|
// avr-midi 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 avr-midi. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#pragma once
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <inttypes.h>
|
|
|
|
/**
|
|
* @file
|
|
* @brief Sysex utility functions
|
|
*
|
|
* These functions are for converting data to and from a "midi-safe" format,
|
|
* which can be use to send data with sysex messages. Sysex messages may only
|
|
* contain data where the to bit is not set.
|
|
*
|
|
* An "encoded" midi message is one that contains all of the data from its
|
|
* original state, but does not have any of the top bits set.
|
|
*
|
|
* Every 7 bytes of decoded data is converted into 8 bytes of encoded data and
|
|
* visa-versa. If you'd like to operate on small segments, make sure that you
|
|
* encode in 7 byte increments and decode in 8 byte increments.
|
|
*
|
|
*/
|
|
|
|
/** @defgroup sysex_tools Sysex utility functions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Compute the length of a message after it is encoded.
|
|
*
|
|
* @param decoded_length The length, in bytes, of the message to encode.
|
|
*
|
|
* @return The length, in bytes, of the message after encodeing.
|
|
*/
|
|
uint16_t sysex_encoded_length(uint16_t decoded_length);
|
|
|
|
/**
|
|
* @brief Compute the length of a message after it is decoded.
|
|
*
|
|
* @param encoded_length The length, in bytes, of the encoded message.
|
|
*
|
|
* @return The length, in bytes, of the message after it is decoded.
|
|
*/
|
|
uint16_t sysex_decoded_length(uint16_t encoded_length);
|
|
|
|
/**
|
|
* @brief Encode data so that it can be transmitted safely in a sysex message.
|
|
*
|
|
* @param encoded The output data buffer, must be at least sysex_encoded_length(length) bytes long.
|
|
* @param source The input buffer of data to be encoded.
|
|
* @param length The number of bytes from the input buffer to encode.
|
|
*
|
|
* @return number of bytes encoded.
|
|
*/
|
|
uint16_t sysex_encode(uint8_t *encoded, const uint8_t *source, uint16_t length);
|
|
|
|
/**
|
|
* @brief Decode encoded data.
|
|
*
|
|
* @param decoded The output data buffer, must be at least sysex_decoded_length(length) bytes long.
|
|
* @param source The input buffer of data to be decoded.
|
|
* @param length The number of bytes from the input buffer to decode.
|
|
*
|
|
* @return number of bytes decoded.
|
|
*/
|
|
uint16_t sysex_decode(uint8_t *decoded, const uint8_t *source, uint16_t length);
|
|
|
|
/**@}*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|