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Compare sdp to determine if transcoding is being used. (#1444)

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* compare sdp for transcoding

* refactor sdp check for leading codec

* fix reference to epOther

* minor changes

* minor

* fix #1447

* fix security issue

* use convenience getter appIsUsingWebsockets in CallSession

---------

Co-authored-by: Dave Horton <daveh@beachdognet.com>
This commit is contained in:
Ed Robbins
2025-11-24 11:50:41 -05:00
committed by GitHub
parent 1984b6d3ea
commit 1a1f53aede
4 changed files with 40 additions and 13 deletions
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11
lib/tasks/dial.js
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@@ -21,7 +21,7 @@ const {parseUri} = require('drachtio-srf');
const {ANCHOR_MEDIA_ALWAYS,
JAMBONZ_DIAL_PAI_HEADER,
JAMBONES_DIAL_SBC_FOR_REGISTERED_USER} = require('../config');
const { isOnhold, isOpusFirst } = require('../utils/sdp-utils');
const { isOnhold, isOpusFirst, getLeadingCodec } = require('../utils/sdp-utils');
const { normalizeJambones } = require('@jambonz/verb-specifications');
const { selectHostPort } = require('../utils/network');
const { sleepFor } = require('../utils/helpers');
@@ -158,6 +158,7 @@ class TaskDial extends Task {
get canReleaseMedia() {
const keepAnchor = this.data.anchorMedia ||
this.weAreTranscoding ||
this.cs.isBackGroundListen ||
this.cs.onHoldMusic ||
ANCHOR_MEDIA_ALWAYS ||
@@ -929,7 +930,13 @@ class TaskDial extends Task {
this.logger.info({err}, 'Dial:_selectSingleDial - Error boosting audio signal');
}
}
/* basic determination to see if call is being transcoded */
const codecA = getLeadingCodec(this.epOther.local.sdp);
const codecB = getLeadingCodec(this.ep.remote.sdp);
this.weAreTranscoding = (codecA !== codecB);
if (this.weAreTranscoding) {
this.logger.info(`Dial:_selectSingleDial - transcoding from ${codecA} (A leg) to ${codecB} (B leg)`);
}
/* if we can release the media back to the SBC, do so now */
if (this.canReleaseMedia || this.shouldExitMediaPathEntirely) {
setTimeout(this._releaseMedia.bind(this, cs, sd, this.shouldExitMediaPathEntirely), 200);