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rtp_engine.c: Add exception for comfort noise payload.

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In a previous commit, a change was made to
ast_rtp_codecs_payload_code_tx_sample_rate to check for differing sample
rates. This ended up returning an invalid payload int for comfort noise.
A check has been added that returns early if the payload is in fact
supposed to be comfort noise.

Fixes: #1340
This commit is contained in:
Ben Ford
2025-09-09 13:34:39 -05:00
parent 0039de5c35
commit 6c453da919
1 changed files with 10 additions and 0 deletions
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10
main/rtp_engine.c
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@@ -2135,6 +2135,16 @@ int ast_rtp_codecs_payload_code_tx_sample_rate(struct ast_rtp_codecs *codecs, in
payload = find_static_payload_type(asterisk_format, format, code);
ast_rwlock_unlock(&static_RTP_PT_lock);
/*
* Comfort noise is NOT used as an SDP negotiated format within Asterisk;
* instead, it is used when it is not negotiated. This special case allows
* its payload to be returned when not negotiated, allowing keep alive to
* function as expected.
*/
if (payload == 13 && code == AST_RTP_CN) {
return payload;
}
ast_rwlock_rdlock(&codecs->codecs_lock);
if (payload >= 0 && payload < AST_VECTOR_SIZE(&codecs->payload_mapping_tx)){
type = AST_VECTOR_GET(&codecs->payload_mapping_tx, payload);