The read-only source property of the RTCRtpContributingSource dictionary contains the source identifier of a particular stream of RTP packets.
The value is the contributing source (CSRC) or synchronization source (SSRC) identifier, depending on whether the object is an RTCRtpContributingSource or RTCRtpSynchronizationSource, which is based on the former.
An unsigned, 32-bit integer value which uniquely identifies the source of RTP packets described by this RTCRtpContributingSource (in which case the value is a CSRC identifier) or RTCRtpSynchronizationSource (the value is an SSRC identifier).
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59 | ≤79 | 59 | No | No | 12.1 | 59 | 59 | 59 | No | 12.2 | 7.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpContributingSource/source