Re: [Discuss-gnuradio] Different input/output rate

[Martin Dvh]

Hi Holger,
> The input of my signal block is a bytestream b. The output should
> also be a bytestream, but with a different number of outgoing items(not a
> multiple of b).
> In other words, after the transformation of the inputstream some extra-bytes
> have to be appended.  
> For example:
>  
> Input y Bytes   ------->   Output (y Bytes * x) + c ; where y and x are integers
> and c Overhead-Bytes: independent from input items
>
> The number of input items is not fixed.
>
> Is this possible or must the number of output items always be a multiple of the
> number of input items?
Yes, this is possible.
You have to extend from gr_block in stead of gr_sync_block.
You have to implement your own forecast block and call consume_all yourself.

Look at the gr_simple_framer block. It does just this.
(src/lib/general/gr_simple_framer.[cc,h,i)]

Greetings,
Martin