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• 特性
• 另请参阅
• 相关话题

RTCRtpCodecParameters dictionary, part of the WebRTC API, is used to describe the configuration parameters for a single media codec . In addition to being the type of the RTCRtpParameters.codecs property, it's used when calling RTCRtpTransceiver.setCodecPreferences() to configure a transceiver's codecs before beginning the offer/answer process to establish a WebRTC peer connection.

Most of the fields in this property take values which are defined and maintained by the Internet Assigned Numbers Authority (IANA). References to relevant IANA documents are provided in the see also section at the end of this article.

特性

payloadType 可选

RTP payload type used to identify this codec.

mimeType 可选

The codec's MIME media type and subtype specified as a DOMString of the form "type/subtype" . IANA maintains a registry of valid MIME types .

clockRate 可选

An unsigned long integer value specifying the codec's clock rate in hertz (Hz). The clock rate is the rate at which the codec's RTP timestamp advances. Most codecs have specific values or ranges of values they permit; see the IANA payload format media type registry 了解细节。

channels 可选

An unsigned short integer indicating the number of channels the codec should support. For example, for audio codecs, a value of 1 specifies monaural sound while 2 indicates stereo.

sdpFmtpLine 可选

A DOMString containing the format-specific parameters field from the "a=fmtp" line in the codec's SDP , if one is present; see section 5.8 of the IETF specification for JSEP . 注意： On an RTCRtpReceiver , the format-specific parameters come from the SDP sent by the remote peer, while for RTCRtpSender , they're provided by the local description.

另请参阅

Real-Time Transport Protocol (RTP) Parameters

The IANA document providing registries of permitted values for the RTP parameters used by this dictionary.

• 最后修改： May 20, 2019

相关话题

1. WebRTC API
2. RTCRtpCodecParameters
3. Related pages for WebRTC

   1. MediaDevices.getUserMedia()
   2. Navigator.mediaDevices
   3. RTCCertificate
   4. RTCDTMFSender
   5. RTCDTMFToneChangeEvent
   6. RTCDataChannel
   7. RTCDataChannelEvent
   8. RTCDtlsTransport
   9. RTCErrorEvent
   10. RTCIceCandidate
   11. RTCIceTransport
   12. RTCPeerConnection
   13. RTCPeerConnectionIceErrorEvent
   14. RTCPeerConnectionIceEvent
   15. RTCRtpReceiver
   16. RTCRtpSender
   17. RTCRtpTransceiver
   18. RTCSctpTransport
   19. RTCSessionDescription
   20. RTCStatsEvent
   21. RTCStatsReport
   22. RTCTrackEvent