From 6d88c555019f32509f303e23dcfbba824fecd2ee Mon Sep 17 00:00:00 2001 From: Chris Hiszpanski Date: Thu, 18 Apr 2019 00:55:30 -0700 Subject: Initial public commit. mDNS and SDP are functional. Otherwise, library is still very much a work in progress. All tests pass. --- src/g711.h | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 src/g711.h (limited to 'src/g711.h') diff --git a/src/g711.h b/src/g711.h new file mode 100644 index 0000000..b607734 --- /dev/null +++ b/src/g711.h @@ -0,0 +1,68 @@ +/* + * 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 . + */ + +#ifndef URTC_G711_H +#define URTC_G711_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include +#include + +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 */ -- cgit v1.2.3