Hi Thomas,
sadly, within the GNU Radio 3.x framework, this isn't possible.
There's one possible "lower effort" solution. Assume you have this
Source -> A -> B -> Sink
where A is the block that currently needs to copy items just to add tags.
We can now do
Source ------> B -> Sink
\-> A -/^
where B is doing some functionality that you needed anyway. Now, B just gets a second
input, that it completely ignores – except for the tags.
A gets modified in that it doesn't copy the input, but simply says "hey, I produced
items", without actually producing items; B would ignore them anyways. A, however, adds
the tags.
Not quite sure this helps you much...
Best regards,
Marcus
On 25.02.22 17:36, Thomas Lorblanchès wrote:
Hi all,
I have some custom blocks that do not change the samples but only add tags in the output
stream.
At very high sampling rates, all these "memcpy" operations to copy the input samples to
the output stream take a lot of time and put a lot of memory pressure on the system, and
are completly useless on an algorithmic point of view.
Is there a clever way to add tags without copying the samples?
Thanks for your answers.
Thomas
