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
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
audioLevel | Chrome No support No | Edge No support No | Firefox
Full support
59
| IE No support No | Opera No support No | Safari ? | WebView Android No support No | Chrome Android No support No | Firefox Android
Full support
59
| Opera Android No support No | Safari iOS ? | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- User must explicitly enable this feature.
- User must explicitly enable this feature.