Re: DLT Request for Radio Data System (RDS)

[Jonathan Brucker <jonathan.brucke () gmail com>]

Actually, I have a small dilemma regarding the offset words (the last 4 bytes):

Does it make more sense to define an enum (0..7) instead of ASCII symbols?

I noticed that VLC project defines RDS blocks (internally) using an
enum, starting from 0:

#define V4L2_RDS_BLOCK_A 0
#define V4L2_RDS_BLOCK_B 1
#define V4L2_RDS_BLOCK_C 2
#define V4L2_RDS_BLOCK_D 3
#define V4L2_RDS_BLOCK_C_ALT 4
#define V4L2_RDS_BLOCK_INVALID 7

Should we do the same? We would also have to add the missing #define
RDS_BLOCK_E 5


On Tue, Sep 13, 2016 at 7:20 PM, Guy Harris <guy () alum mit edu> wrote:
> On Sep 4, 2016, at 6:43 AM, Jonathan Brucker <jonathan.brucke () gmail com> wrote:
>
> > I am posting to request a value for DLT_RDS and LINKTYPE_RDS.
> >
> > Radio Data System (RDS) is a communications protocol standard
> > published in 1992 for embedding small amounts of digital information
> > in conventional FM radio broadcasts.
> >
> > The standard is also known as Radio Broadcast Data System (RBDS) in the US.
> >
> > References and Specifications:
>
> IEC 62106 Edition 3.0 (2015-03) "Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the 
> frequency range from 87,5 MHz to 108,0 MHz", and earlier versions thereof.
>
> > The Offset Symbols are ASCII characters representing the detected
> > syndromes for the corresponding Information Words, and are used in
> > the interpretation of Information Words, as per RDS standard.
>
> OK, so in this format the offset words are given as ASCII characters rather than as the bit sequences.
>
> I've assigned a value of 265 for LINKTYPE_RDS and DLT_RDS, and added an entry for it in 
> http://www.tcpdump.org/linktypes.html; the update to that page probably won't appear immediately, but it should show 
> up in 24 hours or so.
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