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func_jitterbuffer: Add audio/video sync support.

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This change adds support to the JITTERBUFFER dialplan function
for audio and video synchronization. When enabled the RTCP SR
report is used to produce an NTP timestamp for both the audio and
video streams. Using this information the video frames are queued
until their NTP timestamp is equal to or behind the NTP timestamp
of the audio. The audio jitterbuffer acts as the leader deciding
when to shrink/grow the jitterbuffer when adaptive is in use. For
both adaptive and fixed the video buffer follows the size of the
audio jitterbuffer.

ASTERISK-28533

Change-Id: I3fd75160426465e6d46bb2e198c07b9d314a4492
This commit is contained in:
Joshua Colp
2019-09-06 13:18:55 +00:00
parent f9f17f3bfe
commit 6647be69ac
7 changed files with 237 additions and 24 deletions
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doc/CHANGES-staging/func_jitterbuffer_video.txt Normal file
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Subject: func_jitterbuffer
The JITTERBUFFER dialplan function now has an option to enable video synchronization
support. When enabled and used with a compatible channel driver (chan_sip, chan_pjsip)
the video is buffered according to the size of the audio jitterbuffer and is
synchronized to the audio.