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osmo-bts-trx: rx_tchh_fn(): mark valid SID frames as such 

Set the FT (Frame Type) in the ToC (Type-of-Content) section as
defined in section 5.2 of RFC 5993.  Before this change SID frames
had FT = 000 (Good Speech frame), because gsm0503_tch_hr_decode()
does not distinguish between speech and SID frames internally.

Change-Id: I09cec984bb60c754908126acf0300a2cc602485c
Related: SYS#5853
This commit is contained in:
Vadim Yanitskiy 2022-03-16 13:04:50 +03:00
parent eb8059b615
commit 4e9affee0b
1 changed files with 4 additions and 1 deletions
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5
src/osmo-bts-trx/sched_lchan_tchh.c
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@ -149,7 +149,10 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
fn_is_odd, &n_errors, &n_bits_total);
if (rc == (GSM_HR_BYTES + 1)) { /* only for valid *speech* frames */
/* gsm0503_tch_hr_decode() prepends a ToC octet (see RFC5993), skip it */
lchan_set_marker(osmo_hr_check_sid(&tch_data[1], GSM_HR_BYTES), lchan); /* DTXu */
bool is_sid = osmo_hr_check_sid(&tch_data[1], GSM_HR_BYTES);
if (is_sid) /* Mark SID frames as such: F = 0, FT = 010 */
tch_data[0] = (0x02 << 4);
lchan_set_marker(is_sid, lchan); /* DTXu */
}
break;
case GSM48_CMODE_SPEECH_AMR: /* AMR */