diff options
Diffstat (limited to 'src/gsm')
| -rw-r--r-- | src/gsm/gsm0808_utils.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c index 2552c086..e0cdaaf6 100644 --- a/src/gsm/gsm0808_utils.c +++ b/src/gsm/gsm0808_utils.c @@ -1340,6 +1340,16 @@ uint16_t gsm0808_sc_cfg_from_gsm48_mr_cfg(const struct gsm48_multi_rate_conf *cf else s15_s0 &= GSM0808_SC_CFG_DEFAULT_HR_AMR; + /* The mode that is encoded by S1 (Config-NB-Code = 1), takes a special + * role as it does not stand for a single rate, but for up to four rates + * at once (12.2, 7.4, 5.9, 4.75). We must check if the supplied cfg + * covers this mode. If not, we need to make sure that the related + * bit is removed. (See also 3GPP TS 28.062, Table 7.11.3.1.3-2) */ + if (!(cfg->m12_2 && cfg->m7_40 && cfg->m5_90 && cfg->m4_75) && fr) + s15_s0 &= ~GSM0808_SC_CFG_AMR_4_75_5_90_7_40_12_20; + else if (!(cfg->m7_40 && cfg->m5_90 && cfg->m4_75)) + s15_s0 &= ~GSM0808_SC_CFG_AMR_4_75_5_90_7_40_12_20; + return s15_s0; } |