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Dermot Duffy 11cc543406 fix: Hold the 2-way audio backchannel open for the shortest possible time (#2697) 
The card claimed a camera's ONVIF audio backchannel in two places that
had
nothing to do with a call: the capability probe at camera init
(`&microphone`),
and a pre-armed `sendonly` audio transceiver on every live WebRTC offer.
Merely
looking at a dashboard occupied the camera's speaker line. Outbound
audio now
travels on its own audio-only WebRTC connection, opened when a call is
answered
and closed when it ends.

- The backchannel is claimed only for the duration of a call. Idle
viewing
  claims nothing.
- Two-way audio now works in `mse`, `mp4` and `mjpeg` modes (note: the
outbound
  audio still traverses WebRTC).
- No renegotiation and no video blink at call start or end.
- A call that cannot carry audio now reports it and ends, instead of
showing a
  live microphone that goes nowhere.
- `live.microphone.always_connected` is now purely about the browser
microphone
  permission prompt.
- Call setup measured at 66ms (LAN) and ~260ms (cellular) for ICE and
DTLS, plus
  ~300ms for `go2rtc` to open an RTSP backchannel.

Verified against a live Frigate + `go2rtc` instance, and by unit tests
at 100%
coverage.

 - Closes #2691
 - Closes #2039
 - Closes #2178

Ref #2299 -- the probe no longer opens a backchannel, but it still runs
per
camera on every load and reconnect, and still dials the camera on the
direct-`go2rtc` path. Caching remains to be done.

Ref AlexxIT/go2rtc#1860 -- once a call has opened a backchannel,
`go2rtc` keeps
that media set up on the camera's RTSP session for the life of the
producer.

Diagnoses #2678
2026-08-21 20:13:58 -07:00

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style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="249.8184" x="152" y="771.356">Inbound audio unmutes if configured (</text><text fill="#43A047" font-family="monospace" font-size="13" font-weight="700" lengthAdjust="spacing" textLength="125.2266" x="401.8184" y="771.356">live.auto_unmute</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="5.0718" x="527.0449" y="771.356">)</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="258.7114" x="152" y="786.4888">Menu, status bar &amp; next/previous hide (</text><text fill="#43A047" font-family="monospace" font-size="13" font-weight="700" lengthAdjust="spacing" textLength="70.4399" x="410.7114" y="786.4888">auto_hide</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="5.0718" x="481.1514" y="786.4888">)</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="194.124" x="152" y="801.6216">Camera navigation is locked (</text><text fill="#43A047" font-family="monospace" font-size="13" font-weight="700" lengthAdjust="spacing" textLength="180.0132" x="346.124" y="801.6216">live.controls.call.lock</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="5.0718" x="526.1372" y="801.6216">)</text><g class="message" data-entity-1="part1" data-entity-2="part3" data-source-line="55" id="msg9"><polygon fill="#181818" points="639.667,831.8203,649.667,835.8203,639.667,839.8203,643.667,835.8203" style="stroke:#181818;stroke-width:1;"/><line style="stroke:#181818;stroke-width:1;" x1="60.9551" x2="645.667" y1="835.8203" y2="835.8203"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="97.2715" x="67.9551" y="830.7544">Unmute to talk</text></g><path 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points="71.9551,949.3516,61.9551,953.3516,71.9551,957.3516,67.9551,953.3516" style="stroke:#FF0000;stroke-width:1;"/><line style="stroke:#FF0000;stroke-width:1;stroke-dasharray:2,2;" x1="65.9551" x2="732.1255" y1="953.3516" y2="953.3516"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="76.6035" x="77.9551" y="948.2856">Responding</text></g><g class="message" data-entity-1="part1" data-entity-2="part2" data-source-line="63" id="msg12"><polygon fill="#181818" points="334.8721,985.4844,344.8721,989.4844,334.8721,993.4844,338.8721,989.4844" style="stroke:#181818;stroke-width:1;"/><line style="stroke:#181818;stroke-width:1;" x1="60.9551" x2="340.8721" y1="989.4844" y2="989.4844"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="76.6416" x="67.9551" y="984.4185">End the call</text></g><path d="M5,1002.4844 L5,1042.4844 L404,1042.4844 L404,1012.4844 L394,1002.4844 L5,1002.4844" fill="#FEFFDD" style="stroke:#181818;stroke-width:0.5;"/><path d="M394,1002.4844 L394,1012.4844 L404,1012.4844 L394,1002.4844" fill="#FEFFDD" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="131.1616" x="11" y="1019.5513">Via Hang-up button,</text><text fill="#43A047" font-family="monospace" font-size="13" font-weight="700" lengthAdjust="spacing" textLength="62.6133" x="146.2939" y="1019.5513">call_end</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="114.334" x="213.0396" y="1019.5513">action, or -- when</text><text fill="#43A047" font-family="monospace" font-size="13" font-weight="700" lengthAdjust="spacing" textLength="180.0132" x="11" y="1034.6841">live.controls.call.lock</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="194.2002" x="195.1455" y="1034.6841">is disabled -- navigating away</text><path 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