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EVS 比特率对应的字节位： Mod Payload Size (bits Bitrate (kbps) EVS Primary 6 2.4 (EVS Primary SID) Special case(see clause A.2.1.3) 7 2.8 EVS AMR-WB IO 17 6.6 EVS Primary 18 7.2 EVS Primary 20 8 EVS AMR-WB IO 23 8.85 EVS Primary 24 9.6 EVS AMR-WB IO 32 12.65 EVS Primary 33 13.2 EVS AMR-WB IO 36 14.25 EVS AMR-WB IO 40 15.85 EVS Primary 41 16.4 EVS AMR-WB IO 46 18.25 EVS AMR-WB IO 50 19.85 EVS AMR-WB IO 58 23.05 EVS AMR-WB IO 60 23.85 EVS Primary 61 24.4 EVS Primary 80 32 EVS Primary 120 48 EVS Primary 160 64 EVS Primary 240 96 EVS Primary 320 128

evs具体使用的是哪种模式会在sdp头中进行标识，文档中对此的描述如下： evs-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 send and the receive directions. If evs-mode-switch is 1, EVS AMR-WB IO mode is used at the start or update of the session for the send and the receive directions.