Re: [Discuss-gnuradio] [GSOC17 - Draft proposal] Implement SigMF functionality for GNU Radio

[Ben Hilburn]

Responding to a couple of the points made:

On Fri, Mar 24, 2017 at 12:35 PM, Garver, Paul W <address@hidden> wrote:

4) In thinking about the GR metadata format, there’s sort of two different types of metadata you want. One is stuff that doesn’t change such as data type, recorder specifications, etc. The other is the per-sample  stuff like time tags, center frequency, etc. With GR tags, there’s some inefficiency since the static items are written every tag. How does sigMF address this?

SigMF breaks these up into different metadata segments attached to sample indices: https://github.com/gnuradio/SigMF/blob/master/sigmf-spec.md

On Fri, Mar 24, 2017 at 12:17 PM, Bastian Bloessl <address@hidden> wrote:

> So the SigMF spec is designed specifically to enable writing the
> metadata and dataset files in a streaming manner.

Can annotations and capture segments be interleaved or how is it
possible to write the metadata in a streaming manner?

No, they cannot. If your capture details aren't changing (center frequency, bandwidth, etc.,), then you can stream the annotations as they are continuous, but you can't hop back and forth between them.

This is an interesting point, though. Would you mind raising this on the SigMF tracker for discussion, Bastian?

Cheers,

Ben