RTCRtpContributingSource.audioLevel
The read-only audioLevel
property of the RTCRtpContributingSource
interface indicates the audio
level contained in the last RTP packet played from the described source.
audioLevel will be the level value defined in [RFC6465] if the RFC 6465 header extension
is present, and otherwise null.
Syntax
var audioLevel = RTCRtpContributingSource.audioLevel
Value
A double-precision floating-point number which indicates the volume level of the audio
in the most recently received RTP packet from the source described by the
RTCRtpContributingSource
.
This value, which is in the range 0.0 to 1.0, is on a linear scale and its value is defined in dBov, or decibels (overload). This is the amplitude relative to the point at which clipping of the audio begins to occur. A value of 1.0 represents 0 dBov (maximum volume), a value of 0.0 represents silence, and a value of 0.5 represents approximately 6 dB SPL (decibels of sound pressure level) change in the sound pressure level from 0 dBov.
For both RTCRtpContributingSource
and
RTCRtpSynchronizationSource
, the audio level is converted to this form
from the values defined in the specifications corresponding to each type of source.
audioLevel
may be absent from RTCRtpContributingSource
objects, which indicates that no volume level was provided by the source; however, it
is required and always available on all
RTCRtpSynchronizationSource
objects.
Specifications
Specification | Status | Comment |
---|---|---|
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'audioLevel' in that specification. |
Candidate Recommendation | Initial definition. |
Browser compatibility
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