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/* HR RTP Payload according to ETSI TS 101 318. Incompatible with RFC5993! */
/* (C) 2017 by Harald Welte <laforge@gnumonks.org> */
/*
* This file is part of gapk (GSM Audio Pocket Knife).
*
* gapk 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.
*
* gapk 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 gapk. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <assert.h>
#include <string.h>
#include <osmocom/gapk/codecs.h>
#include <osmocom/gapk/formats.h>
#include <osmocom/gapk/utils.h>
/* conversion function: RTP payload -> canonical format */
static int
rtp_hr_etsi_from_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
{
/* according to TS 101 318 */
assert(src_len == HR_CANON_LEN);
memcpy(dst, src, src_len);
return src_len;
}
/* conversion function: canonical format -> RTP payload */
static int
rtp_hr_etsi_to_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
{
/* according to TS 101 318 */
/* broken RTP frames may be short; substitute empty frame */
if (src_len != HR_CANON_LEN) {
memset(dst, 0, HR_CANON_LEN);
return HR_CANON_LEN;
}
memcpy(dst, src, src_len);
return HR_CANON_LEN;
}
const struct osmo_gapk_format_desc fmt_rtp_hr_etsi = {
.type = FMT_RTP_HR_ETSI,
.codec_type = CODEC_HR,
.name = "rtp-hr-etsi",
.description = "RTP payload for HR according to ETSI TS 101 318",
.frame_len = HR_CANON_LEN,
.conv_from_canon = rtp_hr_etsi_from_canon,
.conv_to_canon = rtp_hr_etsi_to_canon,
};
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