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/*
* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <errno.h>
#include <osmocom/core/bits.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/isdn/v110.h>
#include <osmo-bts/csd_v110.h>
#include <osmo-bts/lchan.h>
#define BBUF_MAX 290
struct test_case {
const char *name;
enum gsm_chan_t lchan_type;
enum gsm48_chan_mode tch_mode;
};
static const struct test_case tests[] = {
{
.name = "TCH/F14.4",
.lchan_type = GSM_LCHAN_TCH_F,
.tch_mode = GSM48_CMODE_DATA_14k5,
},
{
.name = "TCH/F9.6",
.lchan_type = GSM_LCHAN_TCH_F,
.tch_mode = GSM48_CMODE_DATA_12k0,
},
{
.name = "TCH/F4.8",
.lchan_type = GSM_LCHAN_TCH_F,
.tch_mode = GSM48_CMODE_DATA_6k0,
},
{
.name = "TCH/H4.8",
.lchan_type = GSM_LCHAN_TCH_H,
.tch_mode = GSM48_CMODE_DATA_6k0,
},
{
.name = "TCH/F2.4",
.lchan_type = GSM_LCHAN_TCH_F,
.tch_mode = GSM48_CMODE_DATA_3k6,
},
{
.name = "TCH/H2.4",
.lchan_type = GSM_LCHAN_TCH_H,
.tch_mode = GSM48_CMODE_DATA_3k6,
},
};
static void exec_test_case(const struct test_case *tc)
{
const struct csd_v110_frame_desc *desc;
uint8_t rtp[RFC4040_RTP_PLEN] = { 0 };
ubit_t data_enc[BBUF_MAX];
ubit_t data_dec[BBUF_MAX];
int rc;
/* obtain a V.110 frame description for the given channel type/rate */
OSMO_ASSERT(tc->tch_mode < ARRAY_SIZE(csd_v110_lchan_desc));
if (tc->lchan_type == GSM_LCHAN_TCH_F)
desc = &csd_v110_lchan_desc[tc->tch_mode].fr;
else
desc = &csd_v110_lchan_desc[tc->tch_mode].hr;
/* total number of bits carried by a radio interface block */
const unsigned int bit_num = desc->num_bits * desc->num_blocks;
if (bit_num == 0) {
fprintf(stderr, "[i] Skipping '%s' (not implemented)\n", tc->name);
return;
}
fprintf(stderr, "[i] Testing '%s' (bitnum=%u)\n", tc->name, bit_num);
struct gsm_lchan lchan = {
.type = tc->lchan_type,
.tch_mode = tc->tch_mode,
};
/* populate the data_enc[] buffer with some bits */
OSMO_ASSERT(bit_num <= BBUF_MAX);
for (unsigned int i = 0; i < bit_num; i++)
data_enc[i] = i & 0x01;
/* encode an RTP frame and print it */
rc = csd_v110_rtp_encode(&lchan, &rtp[0], &data_enc[0], bit_num);
fprintf(stderr, "[i] csd_v110_rtp_encode() returns %d\n", rc);
if (rc != RFC4040_RTP_PLEN)
return;
/* print the encoded RTP frame (16 bytes per row) */
for (unsigned int i = 0; i < sizeof(rtp) / 16; i++)
fprintf(stderr, " %s\n", osmo_hexdump(&rtp[i * 16], 16));
/* decode the encoded RTP frame */
rc = csd_v110_rtp_decode(&lchan, &data_dec[0], &rtp[0], sizeof(rtp));
fprintf(stderr, "[i] csd_v110_rtp_decode() returns %d\n", rc);
if (rc != bit_num)
return;
/* compare data_dec[] vs data_enc[] */
for (unsigned int i = 0; i < bit_num; i++) {
if (data_dec[i] == data_enc[i])
continue;
fprintf(stderr, "[!] Data mismatch @ %03u: D%u vs E%u\n",
i, data_dec[i], data_enc[i]);
}
}
int main(int argc, char **argv)
{
for (unsigned int i = 0; i < ARRAY_SIZE(tests); i++)
exec_test_case(&tests[i]);
return 0;
}
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