Mp3 decoding block

GNU Radio
1

Hi

I need to write a Gnuradio application where I should be able to open
an mp3, decode it and FM modulate it. I do not find any blocks in
Gnuradio that can do this. The idea that I have is to write a C++
block using libmad to decode the mp3 and then use SWIG to make it
available in Gnuradio. Is this correct or is there an easier way?

Thank you

Sebastiaan

2

On Wed, Feb 27, 2008 at 10:55:44AM +0200, Sebastiaan H. wrote:

Hi

I need to write a Gnuradio application where I should be able to open
an mp3, decode it and FM modulate it. I do not find any blocks in
Gnuradio that can do this. The idea that I have is to write a C++
block using libmad to decode the mp3 and then use SWIG to make it
available in Gnuradio. Is this correct or is there an easier way?

Thank you
Sebastiaan

Hi Sebastiaan,

Just use command line mp3 to samples converter, then plumb the output
of that into GNU Radio via a pipe or socket. We currently don’t have
a stereo FM modulator, but that shouldn’t be too hard to write. There
is a mono FM modulator, see blksimpl2/wfm_tx.py. You’d imported it
like this:

from gnuradio import blks2

mod = blks2.wfm_tx(…)

Eric