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-rw-r--r--src/common/amr.c142
1 files changed, 125 insertions, 17 deletions
diff --git a/src/common/amr.c b/src/common/amr.c
index 05d1aaac..47c9dcb5 100644
--- a/src/common/amr.c
+++ b/src/common/amr.c
@@ -6,6 +6,85 @@
#include <osmo-bts/logging.h>
#include <osmo-bts/amr.h>
+/* Reasonable defaults for AMR-FR and AMR-HR rate configuration.
+ * The values are taken from 3GPP TS 51.010-1 (version 13.11.0).
+ * See 14.2.19.4.1 and 14.2.20.4.1 for AMR-FR and AMR-HR, respectively.
+ *
+ * ^ C/I (dB) | FR / HR |
+ * | |
+ * | |
+ * MODE4 | |
+ * = | ----+---- THR_MX_Up(3) | 20.5 / 18.0 |
+ * | | |
+ * | = ----+---- THR_MX_Dn(4) | 18.5 / 16.0 |
+ * MODE3 | |
+ * | = ----+---- THR_MX_Up(2) | 14.5 / 14.0 |
+ * | | |
+ * = | ----+---- THR_MX_Dn(3) | 12.5 / 12.0 |
+ * MODE2 | |
+ * = | ----+---- THR_MX_Up(1) | 8.5 / 10.0 |
+ * | | |
+ * | = ----+---- THR_MX_Dn(2) | 6.5 / 8.0 |
+ * MODE1 | |
+ * | |
+ * | |
+ */
+static const struct gsm48_multi_rate_conf amr_fr_mr_cfg_def = {
+ .m4_75 = 1,
+ .m5_90 = 1,
+ .m7_95 = 1,
+ .m12_2 = 1,
+};
+static const struct amr_mode amr_fr_bts_mode_def[] = {
+ {
+ .mode = 0, /* 4.75k */
+ .threshold = 13, /* THR_MX_Dn(2): 6.5 dB */
+ .hysteresis = 4, /* THR_MX_Up(1): 8.5 dB */
+ },
+ {
+ .mode = 2, /* 5.90k */
+ .threshold = 25, /* THR_MX_Dn(3): 12.5 dB */
+ .hysteresis = 4, /* THR_MX_Up(2): 14.5 dB */
+ },
+ {
+ .mode = 5, /* 7.95k */
+ .threshold = 37, /* THR_MX_Dn(4): 18.5 dB */
+ .hysteresis = 4, /* THR_MX_Up(3): 20.5 dB */
+ },
+ {
+ .mode = 7, /* 12.2k */
+ /* this is the last mode, so no threshold */
+ },
+};
+
+static const struct gsm48_multi_rate_conf amr_hr_mr_cfg_def = {
+ .m4_75 = 1,
+ .m5_90 = 1,
+ .m6_70 = 1,
+ .m7_95 = 1,
+};
+static const struct amr_mode amr_hr_bts_mode_def[] = {
+ {
+ .mode = 0, /* 4.75k */
+ .threshold = 16, /* THR_MX_Dn(2): 8.0 dB */
+ .hysteresis = 4, /* THR_MX_Up(1): 10.0 dB */
+ },
+ {
+ .mode = 2, /* 5.90k */
+ .threshold = 24, /* THR_MX_Dn(3): 12.0 dB */
+ .hysteresis = 4, /* THR_MX_Up(2): 14.0 dB */
+ },
+ {
+ .mode = 3, /* 6.70k */
+ .threshold = 32, /* THR_MX_Dn(4): 16.0 dB */
+ .hysteresis = 4, /* THR_MX_Up(3): 18.0 dB */
+ },
+ {
+ .mode = 5, /* 7.95k */
+ /* this is the last mode, so no threshold */
+ },
+};
+
void amr_log_mr_conf(int ss, int logl, const char *pfx,
struct amr_multirate_conf *amr_mrc)
{
@@ -16,9 +95,9 @@ void amr_log_mr_conf(int ss, int logl, const char *pfx,
for (i = 0; i < amr_mrc->num_modes; i++)
LOGPC(ss, logl, ", mode[%u] = %u/%u/%u",
- i, amr_mrc->bts_mode[i].mode,
- amr_mrc->bts_mode[i].threshold,
- amr_mrc->bts_mode[i].hysteresis);
+ i, amr_mrc->mode[i].mode,
+ amr_mrc->mode[i].threshold,
+ amr_mrc->mode[i].hysteresis);
LOGPC(ss, logl, "\n");
}
@@ -27,7 +106,7 @@ static inline int get_amr_mode_idx(const struct amr_multirate_conf *amr_mrc,
{
unsigned int i;
for (i = 0; i < amr_mrc->num_modes; i++) {
- if (amr_mrc->bts_mode[i].mode == cmi)
+ if (amr_mrc->mode[i].mode == cmi)
return i;
}
return -EINVAL;
@@ -78,13 +157,16 @@ void amr_set_mode_pref(uint8_t *data, const struct amr_multirate_conf *amr_mrc,
int amr_parse_mr_conf(struct amr_multirate_conf *amr_mrc,
const uint8_t *mr_conf, unsigned int len)
{
- uint8_t mr_version = mr_conf[0] >> 5;
uint8_t num_codecs = 0;
int i, j = 0;
- if (mr_version != 1) {
- LOGP(DRSL, LOGL_ERROR, "AMR Multirate Version %u unknown\n",
- mr_version);
+ if (len < 2) {
+ LOGP(DRSL, LOGL_ERROR, "AMR Multirate IE is too short (%u)\n", len);
+ goto ret_einval;
+ }
+
+ if ((mr_conf[0] >> 5) != 1) {
+ LOGP(DRSL, LOGL_ERROR, "AMR Multirate Version %u unknown\n", (mr_conf[0] >> 5));
goto ret_einval;
}
@@ -114,23 +196,26 @@ int amr_parse_mr_conf(struct amr_multirate_conf *amr_mrc,
for (i = 0; i < 8; i++) {
if (mr_conf[1] & (1 << i)) {
- amr_mrc->bts_mode[j++].mode = i;
+ amr_mrc->mode[j++].mode = i;
}
}
+ /* skip the first two octets of the IE */
+ mr_conf += 2;
+
if (num_codecs >= 2) {
- amr_mrc->bts_mode[0].threshold = mr_conf[1] & 0x3F;
- amr_mrc->bts_mode[0].hysteresis = mr_conf[2] >> 4;
+ amr_mrc->mode[0].threshold = mr_conf[0] & 0x3F;
+ amr_mrc->mode[0].hysteresis = mr_conf[1] >> 4;
}
if (num_codecs >= 3) {
- amr_mrc->bts_mode[1].threshold =
- ((mr_conf[2] & 0xF) << 2) | (mr_conf[3] >> 6);
- amr_mrc->bts_mode[1].hysteresis = (mr_conf[3] >> 2) & 0xF;
+ amr_mrc->mode[1].threshold =
+ ((mr_conf[1] & 0xF) << 2) | (mr_conf[2] >> 6);
+ amr_mrc->mode[1].hysteresis = (mr_conf[2] >> 2) & 0xF;
}
if (num_codecs >= 4) {
- amr_mrc->bts_mode[2].threshold =
- ((mr_conf[3] & 0x3) << 4) | (mr_conf[4] >> 4);
- amr_mrc->bts_mode[2].hysteresis = mr_conf[4] & 0xF;
+ amr_mrc->mode[2].threshold =
+ ((mr_conf[2] & 0x3) << 4) | (mr_conf[3] >> 4);
+ amr_mrc->mode[2].hysteresis = mr_conf[3] & 0xF;
}
return num_codecs;
@@ -168,3 +253,26 @@ unsigned int amr_get_initial_mode(struct gsm_lchan *lchan)
}
}
}
+
+void amr_init_mr_conf_def(struct gsm_lchan *lchan)
+{
+ const struct gsm48_multi_rate_conf *mr_cfg;
+ const struct amr_mode *bts_mode;
+ unsigned int num_modes;
+
+ if (lchan->type == GSM_LCHAN_TCH_F) {
+ num_modes = ARRAY_SIZE(amr_fr_bts_mode_def);
+ bts_mode = &amr_fr_bts_mode_def[0];
+ mr_cfg = &amr_fr_mr_cfg_def;
+ } else {
+ num_modes = ARRAY_SIZE(amr_hr_bts_mode_def);
+ bts_mode = &amr_hr_bts_mode_def[0];
+ mr_cfg = &amr_hr_mr_cfg_def;
+ }
+
+ memcpy(lchan->tch.amr_mr.gsm48_ie, mr_cfg,
+ sizeof(lchan->tch.amr_mr.gsm48_ie));
+ memcpy(&lchan->tch.amr_mr.mode[0], &bts_mode[0],
+ sizeof(lchan->tch.amr_mr.mode));
+ lchan->tch.amr_mr.num_modes = num_modes;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-21 09:22:42 +0000