Hi Community, Please ignore my second question in previous email:
(2) From A.2.2.1.2 ToC byte section: > F (1 bit): If set to 1, indicates that the corresponding frame is followed by another speech frame in this payload, implying that another ToC byte follows this entry; if set to 0, indicates that this frame is the last frame in this payload and no further header entry follows this entry. I know there can be multiple TOCs followed by "speech data '', and use "F bit" in ToC byte to indicate whether this is the last TOC byte. I am just wondering if there is a possibility that the first byte of speech data can also have the "F bit" set to 1, so it is misunderstood as Toc byte? I just realised I made a silly mistake, and very sorry for causing inconvenience! Best Regards Nan Xiao On Fri, Oct 15, 2021 at 5:30 PM Nan Xiao <xiaonan830...@gmail.com> wrote: > Hi Community, > > Greetings from me! > > Now I am reading EVS dissection code, and have two questions: > > (1) There is evs_132_bwctrf_idx_vals variable ( > https://gitlab.com/wireshark/wireshark/-/blob/master/epan/dissectors/packet-evs.c#L352) > which helps to decode BW, CT and RF parameters. But from spec ( > https://www.etsi.org/deliver/etsi_ts/126400_126499/126445/12.01.00_60/ts_126445v120100p.pdf), > 7.1.2 > Bit allocation at 13.2 kbps section, I can only find following words: > > > Note that the BW, CT, and RF parameters are combined together to form a > single index. ...... > > But the spec doesn't say how to decode the "single index", so I just want > to know where to find the definition of this index. > > (2) From A.2.2.1.2 ToC byte section: > > F (1 bit): If set to 1, indicates that the corresponding frame is > followed by another speech frame in this payload, implying that another ToC > byte follows this entry; if set to 0, indicates that this frame is the last > frame in this payload and no further header entry follows this entry. > > I know there can be multiple TOCs followed by "speech data '', and use "F > bit" in ToC byte to indicate whether this is the last TOC byte. I am just > wondering if there is a possibility that the first byte of speech data can > also have the "F bit" set to 1, so it is misunderstood as Toc byte? > > Hope someone can give me some advice! Thanks very much in advance! > > Best Regards > Nan Xiao >
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