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Re: [Discuss-gnuradio] Tag propagation policy for tagged stream blocks

From: Andrej Rode
Subject: Re: [Discuss-gnuradio] Tag propagation policy for tagged stream blocks
Date: Wed, 17 Apr 2019 10:19:49 +0200

Hi Johannes, 

thanks for bringin this issue up.

On Wed, 17 Apr 2019 08:08:37 +0000
Johannes Demel <address@hidden> wrote:

> but what happens to other tags? They are left untouched. This results
> in a situation where a rate change basically makes all other tags
> disappear because these tags will be out of range for all other
> blocks down the line. Right now, the options are to not use tags,

This sounds like it is a bug and a solution should be implemented for
tagged stream blocks in the GR source. Recently changes were introduced
for tag propagation to use rational numbers to survive multiple down-
and upsampling steps. Plugging that calculation for tagged stream
blocks should be somehow possible, e.g. using instantaneous
decimation/interpolation rates.


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