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gsm48_cc_tx_setup_select_codecs: split out

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Change-Id: Ic502f9ed77ea57de4cf6d362c0e7070d9147d6f3
This commit is contained in:
Oliver Smith
2025-09-03 12:28:15 +02:00
parent 7ae6e6c509
commit eb9cd89089
1 changed files with 34 additions and 22 deletions
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56
src/libmsc/gsm_04_08_cc.c
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@@ -865,34 +865,22 @@ static int gsm48_cc_tx_setup_set_transaction_id(struct gsm_trans *trans)
return 0;
}
static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
/* MT call leg is starting. Gather all codecs information so far known.
* (Usually) paging has succeeded, and now we're processing the MNCC Setup from
* the remote MO call leg. Initialize the codecs filter with this side's BSS'
* codec list, received at Complete Layer 3. We haven't received the MT MS's
* Bearer Capabilities yet; the Bearer Capabilities handled here are actually
* the remote call leg's Bearer Capabilities. */
static int gsm48_cc_tx_setup_select_codecs(struct gsm_trans *trans, const struct gsm_mncc *setup)
{
struct msgb *msg;
struct gsm48_hdr *gh;
struct gsm_mncc *setup = arg;
int rc;
struct gsm_mncc_bearer_cap bearer_cap;
rc = gsm48_cc_tx_setup_set_transaction_id(trans);
if (rc < 0)
goto error;
gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
/* MT call leg is starting. Gather all codecs information so far known.
* (Usually) paging has succeeded, and now we're processing the MNCC Setup from the remote MO call leg.
* Initialize the codecs filter with this side's BSS' codec list, received at Complete Layer 3.
* We haven't received the MT MS's Bearer Capabilities yet; the Bearer Capabilities handled here are
* actually the remote call leg's Bearer Capabilities. */
trans_cc_filter_init(trans);
trans_cc_filter_set_ran(trans, trans->msc_a->c.ran->type);
trans_cc_filter_set_bss(trans, trans->msc_a);
if (setup->fields & MNCC_F_BEARER_CAP)
trans->bearer_cap.transfer = setup->bearer_cap.transfer;
switch (trans->bearer_cap.transfer) {
case GSM48_BCAP_ITCAP_SPEECH:
/* if SDP is included in the MNCC, take that as definitive list of remote audio codecs. */
/* if SDP is included in the MNCC, take that as definitive list
* of remote audio codecs. */
rx_mncc_sdp(trans, setup->msg_type, setup->sdp,
(setup->fields & MNCC_F_BEARER_CAP) ? &setup->bearer_cap : NULL);
/* rx_mncc_sdp() has called trans_cc_filter_run(trans); */
@@ -915,9 +903,33 @@ static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
default:
LOG_TRANS(trans, LOGL_ERROR, "Handling of information transfer capability %d not implemented\n",
trans->bearer_cap.transfer);
break;
return -1;
}
return 0;
}
static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg)
{
struct msgb *msg;
struct gsm48_hdr *gh;
struct gsm_mncc *setup = arg;
int rc;
struct gsm_mncc_bearer_cap bearer_cap;
rc = gsm48_cc_tx_setup_set_transaction_id(trans);
if (rc < 0)
goto error;
gsm48_start_cc_timer(trans, 0x303, GSM48_T303);
if (setup->fields & MNCC_F_BEARER_CAP)
trans->bearer_cap.transfer = setup->bearer_cap.transfer;
rc = gsm48_cc_tx_setup_select_codecs(trans, setup);
if (rc < 0)
goto error;
/* Compose Bearer Capability information that reflects only the codecs (Speech Versions) / CSD bearer services
* remaining after intersecting MS, BSS and remote call leg restrictions. To store in trans for later use, and
* to include in the outgoing CC Setup message. */