Re: [Discuss-gnuradio] Packets and m-blocks

[George Nychis]

Gregory Maxwell wrote:
> Greetings. Some time ago created a number of GNURadio signal
> processing blocks for audio codecs, and have recently gotten around to
> finishing them up for public release (Speex and CELT, along with the
> speex acoustic echo canceler).   Constant bitrate support was a piece
> of cake (and wow does Speex sound better than GSM FR, I forgot how bad
> GSM was... ;) )
>
> However, I'm stuck on supporting variable bitrate mode. I basically
> want to present a variable sized packet interface for the coded side.
> It seems that the m-block code is what I want to use for that ... but
> I can't find any examples of m-block code that I could emulate.   Can
> someone kick me in the right direction?

Hi Gregory,

I don't know if there is any way around this using the regular GNU Radio 
blocks, m-blocks do allow variable sized messages in between blocks, 
however there is no support for m-block->gr-block connections yet.  I 
believe Eric is scheduled to work on this soon.  So in summary, yes the 
m-blocks could solve your problem, but they are not ready for use with 
the rest of the GNU Radio code base yet.

- George