貌似不支持amr-wb的解码

[myj420]

[kevinho]

是的，的确不支持 arm-wb

[myj420]

是的，的确不支持 arm-wb

我按照你原有的工程 封了一个wb的解码 用你的AmrFileDecoder播放有问题 不知道是我哪里写的不对

[myj420]

还请教个问题 amr_frame_size 32 是怎么算的 我录音用16K比特率 解码正确 换了别的比特率 解码后声音就不行了

[kevinho]

the framesize 32 comes from the spec:

http://read.pudn.com/downloads466/doc/fileformat/1956393/AMR%20format.pdf

and the codec code.

because i am using this mode:

7 - AMR 12.2 - Encodes at 12.2kbit/s

to encode, so the output would be

CMR MODE FRAME SIZE( in bytes )
7 AMR 12.2 32

you can find the corresponding frame size in your codec and your, probably, you can refer here:

https://www.researchgate.net/figure/Packet-sizes-of-AMR-WB-codec-modes_tbl2_303326939

https://tools.ietf.org/html/draft-lakaniemi-avt-amrwb-00

                     Class A   total speech
   Index   Mode          bits        bits
   ----------------------------------------
     0     AMR-WB 6.6      54         78
     1     AMR-WB 8.85     64        113
     2     AMR-WB 12.65    72        181
     3     AMR-WB 14.25    72        213
     4     AMR-WB 15.85    72        245
     5     AMR-WB 18.25    72        293
     6     AMR-WB 19.85    72        325
     7     AMR-WB 23.05    72        389
     8     AMR-WB 23.85    72        405
     9     AMR-WB SID      40         40

[kevinho]

hope to hear from you again, and looking forward to your WB-support opensource

[williambao]

@myj420 有支持amr-wb吗?