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/*
* liburtc
* Copyright (C) 2019 Chris Hiszpanski
*
* This program 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.
*
* This program 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 program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef URTC_G711_H
#define URTC_G711_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h>
#include <stdint.h>
extern const uint8_t pcm2ulaw[];
extern const int16_t ulaw2pcm[];
/**
* ITU-T G.711 compand a 16-bit signed PCM audio buffer. Buffer may contain
* multiple channels, in which case \a n must be the number of frames times
* the number of channels.
*
* Only the upper 13-bits are companded. The lowest 3-bits are discarded.
*
* \a dst must be allocated and point to at least (\a n / 2) bytes. \a dst
* and \a src may overlap.
*
* @param dst Destination buffer
* @param src Signed 16-bit sample source buffer
* @param n Number of samples (frames times channels)
*/
void g711_encode(uint8_t *dst, const int16_t *src, size_t n);
/**
* ITU-T G.711 decompand to a 16-bit signed PCM audio buffer. Buffer may
* contain multiple channels, in which case \a n must be the number of frames
* times the number of channels.
*
* The decompanded samples are normalized to 16-bits (the lowest 3-bits will be
* zero).
*
* \a dst must NOT overlap with \a src.
*
* @param dst Destination buffer
* @param src Signed 16-bit sample source buffer
* @param n Number of samples (frames times channels)
*/
void g711_decode(int16_t *dst, const uint8_t *src, size_t n);
#ifdef __cplusplus
}
#endif
#endif /* URTC_G711_H */
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