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path: root/src/osmo-bsc/osmo_bsc_bssap.c
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Diffstat (limited to 'src/osmo-bsc/osmo_bsc_bssap.c')
-rw-r--r--src/osmo-bsc/osmo_bsc_bssap.c133
1 files changed, 107 insertions, 26 deletions
diff --git a/src/osmo-bsc/osmo_bsc_bssap.c b/src/osmo-bsc/osmo_bsc_bssap.c
index ab7f79ce1..85aab22d2 100644
--- a/src/osmo-bsc/osmo_bsc_bssap.c
+++ b/src/osmo-bsc/osmo_bsc_bssap.c
@@ -616,6 +616,101 @@ static int bssmap_handle_lcls_connect_ctrl(struct gsm_subscriber_connection *con
return 0;
}
+/* Select a prefered and an alternative codec rate depending on the available
+ * capabilities. This decision does not include the actual channel load yet,
+ * this is also the reason why the result is a prefered and an alternate
+ * setting. The final decision is made in assignment_fsm.c when the actual
+ * lchan is requested. The preferred lchan will be requested first. If we
+ * find an alternate setting here, this one will be tried secondly if our
+ * primary coice fails. */
+static int select_codecs(struct assignment_request *req, struct gsm0808_channel_type *ct,
+ struct gsm_subscriber_connection *conn)
+{
+ int rc;
+ struct bsc_msc_data *msc;
+
+ msc = conn->sccp.msc;
+ req->ch_mode_rate_alt_present = false;
+
+ switch (ct->ch_rate_type) {
+ case GSM0808_SPEECH_FULL_BM:
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_FR);
+ break;
+ case GSM0808_SPEECH_HALF_LM:
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_HR);
+ break;
+ case GSM0808_SPEECH_PERM:
+ case GSM0808_SPEECH_PERM_NO_CHANGE:
+ case GSM0808_SPEECH_FULL_PREF_NO_CHANGE:
+ case GSM0808_SPEECH_FULL_PREF:
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_FR);
+ if (rc < 0) {
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_HR);
+ break;
+ }
+ rc = match_codec_pref(&req->ch_mode_rate_alt, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_HR);
+ if (rc == 0)
+ req->ch_mode_rate_alt_present = true;
+ rc = 0;
+ break;
+ case GSM0808_SPEECH_HALF_PREF_NO_CHANGE:
+ case GSM0808_SPEECH_HALF_PREF:
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_HR);
+
+ if (rc < 0) {
+ rc = match_codec_pref(&req->ch_mode_rate_pref, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_FR);
+ break;
+ }
+ rc = match_codec_pref(&req->ch_mode_rate_alt, ct, &conn->codec_list, msc, conn_get_bts(conn),
+ RATE_PREF_FR);
+ if (rc == 0)
+ req->ch_mode_rate_alt_present = true;
+ rc = 0;
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+ if (rc < 0) {
+ LOGP(DMSC, LOGL_ERROR, "No supported audio type found for channel_type ="
+ " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[%s] }\n",
+ ct->ch_indctr, ct->ch_rate_type, osmo_hexdump(ct->perm_spch, ct->perm_spch_len));
+ /* TODO: actually output codec names, e.g. implement
+ * gsm0808_permitted_speech_names[] and iterate perm_spch. */
+ return -EINVAL;
+ }
+
+ if (req->ch_mode_rate_alt_present) {
+ DEBUGP(DMSC, "Found matching audio type (preferred): %s %s for channel_type ="
+ " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[ %s] }\n",
+ req->ch_mode_rate_pref.full_rate ? "full rate" : "half rate",
+ get_value_string(gsm48_chan_mode_names, req->ch_mode_rate_pref.chan_mode),
+ ct->ch_indctr, ct->ch_rate_type, osmo_hexdump(ct->perm_spch, ct->perm_spch_len));
+ DEBUGP(DMSC, "Found matching audio type (alternative): %s %s for channel_type ="
+ " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[ %s] }\n",
+ req->ch_mode_rate_alt.full_rate ? "full rate" : "half rate",
+ get_value_string(gsm48_chan_mode_names, req->ch_mode_rate_alt.chan_mode),
+ ct->ch_indctr, ct->ch_rate_type, osmo_hexdump(ct->perm_spch, ct->perm_spch_len));
+ } else {
+ DEBUGP(DMSC, "Found matching audio type: %s %s for channel_type ="
+ " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[ %s] }\n",
+ req->ch_mode_rate_pref.full_rate ? "full rate" : "half rate",
+ get_value_string(gsm48_chan_mode_names, req->ch_mode_rate_pref.chan_mode),
+ ct->ch_indctr, ct->ch_rate_type, osmo_hexdump(ct->perm_spch, ct->perm_spch_len));
+
+ }
+
+ return 0;
+}
+
/*
* Handle the assignment request message.
*
@@ -625,18 +720,15 @@ static int bssmap_handle_assignm_req(struct gsm_subscriber_connection *conn,
struct msgb *msg, unsigned int length)
{
struct msgb *resp;
- struct bsc_msc_data *msc;
struct tlv_parsed tp;
uint16_t cic = 0;
- enum gsm48_chan_mode chan_mode = GSM48_CMODE_SIGN;
- bool full_rate = false;
- uint16_t s15_s0 = 0;
bool aoip = false;
struct sockaddr_storage rtp_addr;
struct gsm0808_channel_type ct;
uint8_t cause;
int rc;
struct assignment_request req = {};
+ struct channel_mode_and_rate ch_mode_rate_pref = {};
if (!conn) {
LOGP(DMSC, LOGL_ERROR,
@@ -644,7 +736,6 @@ static int bssmap_handle_assignm_req(struct gsm_subscriber_connection *conn,
return -1;
}
- msc = conn->sccp.msc;
aoip = gscon_is_aoip(conn);
tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, length - 1, 0, 0);
@@ -732,33 +823,19 @@ static int bssmap_handle_assignm_req(struct gsm_subscriber_connection *conn,
goto reject;
}
+ req = (struct assignment_request){
+ .aoip = aoip,
+ .msc_assigned_cic = cic,
+ };
+
/* Match codec information from the assignment command against the
* local preferences of the BSC and BTS */
- rc = match_codec_pref(&chan_mode, &full_rate, &s15_s0, &ct, &conn->codec_list,
- msc, conn_get_bts(conn));
+ rc = select_codecs(&req, &ct, conn);
if (rc < 0) {
- LOGP(DMSC, LOGL_ERROR, "No supported audio type found for channel_type ="
- " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[ %s] }\n",
- ct.ch_indctr, ct.ch_rate_type, osmo_hexdump(ct.perm_spch, ct.perm_spch_len));
- /* TODO: actually output codec names, e.g. implement
- * gsm0808_permitted_speech_names[] and iterate perm_spch. */
cause = GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_UNAVAIL;
goto reject;
}
- DEBUGP(DMSC, "Found matching audio type: %s %s for channel_type ="
- " { ch_indctr=0x%x, ch_rate_type=0x%x, perm_spch=[ %s] }\n",
- full_rate? "full rate" : "half rate",
- get_value_string(gsm48_chan_mode_names, chan_mode),
- ct.ch_indctr, ct.ch_rate_type, osmo_hexdump(ct.perm_spch, ct.perm_spch_len));
-
- req = (struct assignment_request){
- .aoip = aoip,
- .msc_assigned_cic = cic,
- .chan_mode = chan_mode,
- .full_rate = full_rate,
- .s15_s0 = s15_s0
- };
if (aoip) {
unsigned int rc = osmo_sockaddr_to_str_and_uint(req.msc_rtp_addr,
sizeof(req.msc_rtp_addr),
@@ -772,9 +849,13 @@ static int bssmap_handle_assignm_req(struct gsm_subscriber_connection *conn,
}
break;
case GSM0808_CHAN_SIGN:
+ ch_mode_rate_pref = (struct channel_mode_and_rate) {
+ .chan_mode = GSM48_CMODE_SIGN,
+ };
+
req = (struct assignment_request){
.aoip = aoip,
- .chan_mode = chan_mode,
+ .ch_mode_rate_pref = ch_mode_rate_pref,
};
break;
default:
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-12 10:38:42 +0000