DIGITAL GAP
EVSrtp及sdp相关协议MIME media type name : Audio
MIME subtype name : Standards Tree - EVS
Required parameters : None
Optional parameters :
钙矾石These parameters apply to RTP transfer only.
海商法论文
ptime: defined in section 6 of RFC-ietf-mmusic-rfc4566bis-37
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跟踪maxptime: defined in section 6 of RFC-ietf-mmusic-rfc4566bis-37evs-mode-switch: Permissible values are 0 and 1. If evs-mode-switch is 0 or not present, EVS primary mode is used at the start or update of the session for the s hf-only: Permissible values are 0 and 1. If hf-only is 0 or not present, both Compact and Header-Full formats can be used in the session for the send and the rece NOTE 1: The hf-only parameter applies to both directions in the session, including when hf-only is 1.
dtx: Permissible values are 0 and 1. If dtx is 0, DTX is disabled in the session for the send and the receive directions. If dtx is 1 or not present, DTX is enabled. If d NOTE 2: If dtx is not present, DTX can still be disabled by the inclusion of dtx-recv=0 for the direction indicated by dtx-recv. See also clause A.3.3.1 and clause A. dtx-recv: Permissible values are 0 and 1. If dtx-recv=0 is included for a payload type in the received SDP offer or the received SDP answer, and the payload type NOTE 3: dtx-recv only applies for the media direction towards the SDP sender. If dtx-recv is not present, dtx determines if DTX is enabled or disabled. See also cl max-red: defined in RFC 4867
channels: The number of audio channels. See RFC 3551. If channels is not present, its default value is 1. If both ch-send and ch-recv are included in the SDP wit cmr: Permissible values are -1, 0, and 1. If cmr is -1 and the session is in the EVS primary mode, CMR on the RTP payload header is disabled in the session. If cm br: Specifies the range of source codec bit-rate for EVS Primary mode (see Table 1 of 3GPP TS 26.441) in the session, in kilobits per second, for the send and th br-send: Specifies the range of source codec bit-rate for EVS Primary mode (see Table 1 of 3GPP TS 26.441) in the session, in kilobits per second, for the send d br-recv: Specifies the range of source codec bit-rate for EVS Primary mode (see Table 1 of 3GPP TS 26.441) in the session, in kilobits per second, for the receive bw: Specifies the audio bandwidth for EVS Primary mode (see Table 1 of 3GPP TS 26.
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政局441) to be used in the session for the send and the receive directions. bw h bw-send: Specifies the bandwidth (see Table 1 of 3GPP TS 26.441) to be used in the session for the send direction. bw-send has a value from the set: nb, wb, sw bw-recv: Specifies the bandwidth (see Table 1 of 3GPP TS 26.441) to be used in the session for the receive direction. bw-recv has a value from the set: nb, wb, s ch-send: Specifies the number of audio channels to be used in the session for the send direction. ch-send has an integer value from 1 to the maximum number o ch-recv: Specifies the number of audio channels to be used in the session for the receive direction. ch-recv has an integer value from 1 to the maximum number o ch-aw-recv: Specifies how channel-aware mode is configured or used for the receive direction. Permissible values are -1, 0, 2, 3, 5, and 7. If ch-aw-recv is -1, cha mode-set: Restricts the active codec mode set to a subset of all modes when the EVS codec operates in AMR-WB IO, for example, to be able to support transpor NOTE 4: If a positive (2, 3, 5, or 7) value of ch-aw-recv is declared for a payload type and the payload type is accepted, the receiver of the parameter shall send p NOTE 5: The frame erasure rate indicator for the channel-aware mode has two permissible values (LO, HI) and this indicator has to be initialized to HI, as specifie mode-change-period: defined in section 8.1 of RFC 4867
mode-change-capability: defined in section 8.1 of RFC 4867, except that the default and the only allo
wed value of mode-change-capability is 2 for EVS AMR-WB mode-change-neighbor: defined in section 8.1 of RFC 4867
Encoding considerations : This media type is framed and binary; see Section 4.8 in RFC 6838
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