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Implement the use of DTX (discontinued transmission)
send nothing while silence (in RTP-processor)
on continuation of audio-stream, set marker-bit in RTP header
on receivers side, continue creating silence-packages (and increment sequence-number, as before)
on receiver side, when marker set, reset current sequence-number to received one (to sync number of "not send" and "not received" packages
Determining silence:
implement as Processor (automatically added, like RTP-processor?)
Calculate sum of absolute values / quadratic sum of samples and check for a given threshold (e.g. by converting to decibel, threshold could be configurable)
silence-calculation must be fast
add flag for silence to stream-parameters (so other processors can skip it)
flag is set by silence-processor on transmitting end and rtp-processor on receiving (when playing silent-package)
Added format-parameters to SupportedFormats and SDP-message
Added support for DTX to SIPConfiguration, see #65
Signed-off-by:doe300 <stadeldani@web.de>
Implement the use of DTX (discontinued transmission)
Determining silence:
Silence-Handling:
See:
http://stackoverflow.com/questions/15002688/detect-sound-level-in-raw-pcm-data
https://en.wikipedia.org/wiki/Decibel#Acoustics
https://tools.ietf.org/html/rfc7587
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