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/*
* OsmocomBB <-> SDR connection bridge
* TDMA scheduler: common routines for lchan handlers
*
* (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
* Contributions by sysmocom - s.f.m.c. GmbH
*
* All Rights Reserved
*
* 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 2 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.
*
*/
#include <errno.h>
#include <string.h>
#include <talloc.h>
#include <stdint.h>
#include <stdbool.h>
#include <arpa/inet.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/bits.h>
#include <osmocom/codec/codec.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/protocol/gsm_08_58.h>
#include <osmocom/bb/l1sched/l1sched.h>
#include <osmocom/bb/l1sched/logging.h>
/* GSM 05.02 Chapter 5.2.3 Normal Burst (NB) */
const uint8_t l1sched_nb_training_bits[8][26] = {
{
0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0,
0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1,
},
{
0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1,
1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1,
},
{
0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1,
0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0,
},
{
0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0,
1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
},
{
0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0,
1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1,
},
{
0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0,
0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0,
},
{
1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1,
0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
},
{
1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0,
0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0,
},
};
/* Get a string representation of the burst buffer's completeness.
* Examples: " ****.." (incomplete, 4/6 bursts)
* " ****" (complete, all 4 bursts)
* "**.***.." (incomplete, 5/8 bursts) */
const char *l1sched_burst_mask2str(const uint8_t *mask, int bits)
{
/* TODO: CSD is interleaved over 22 bursts, so the mask needs to be extended */
static char buf[8 + 1];
char *ptr = buf;
OSMO_ASSERT(bits <= 8 && bits > 0);
while (--bits >= 0)
*(ptr++) = (*mask & (1 << bits)) ? '*' : '.';
*ptr = '\0';
return buf;
}
bool l1sched_lchan_amr_prim_is_valid(struct l1sched_lchan_state *lchan, bool is_cmr)
{
enum osmo_amr_type ft_codec;
uint8_t cmr_codec;
int ft, cmr, len;
len = osmo_amr_rtp_dec(msgb_l2(lchan->prim), msgb_l2len(lchan->prim),
&cmr_codec, NULL, &ft_codec, NULL, NULL);
if (len < 0) {
LOGP_LCHAND(lchan, LOGL_ERROR, "Cannot send invalid AMR payload (%u): %s\n",
msgb_l2len(lchan->prim), msgb_hexdump_l2(lchan->prim));
return false;
}
ft = -1;
cmr = -1;
for (unsigned int i = 0; i < lchan->amr.codecs; i++) {
if (lchan->amr.codec[i] == ft_codec)
ft = i;
if (lchan->amr.codec[i] == cmr_codec)
cmr = i;
}
if (ft < 0) {
LOGP_LCHAND(lchan, LOGL_ERROR,
"Codec (FT = %d) of RTP frame not in list\n", ft_codec);
return false;
}
if (is_cmr && lchan->amr.ul_ft != ft) {
LOGP_LCHAND(lchan, LOGL_ERROR,
"Codec (FT = %d) of RTP cannot be changed now, but in next frame\n",
ft_codec);
return false;
}
lchan->amr.ul_ft = ft;
if (cmr < 0) {
LOGP_LCHAND(lchan, LOGL_ERROR,
"Codec (CMR = %d) of RTP frame not in list\n", cmr_codec);
} else {
lchan->amr.ul_cmr = cmr;
}
return true;
}
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