Toolame-DAB

Revision as of 20:12, 3 February 2015

Toolame is an open source implementation of MPEG-1/2 Layer II audio coding. Toolame-dab is a modified version that supports the MPEG ZMQ output to ODR-DabMux, improved PAD insertion compatible with mot-encoder and JACK input.

It also supports the necessary options to add a DAB PAD field on every frame, and work is ongoing to make it compatible with mot-encoder from fdk-aac-dabplus for MOT Slideshow and DLS support. The toolame-dab always uses DAB framing.

Its development is done on github: https://github.com/Opendigitalradio/toolame-dab

Basic Usage

-s <kHz>: sampling rate in kHz
-p <bytes>: add x PAD bytes to every MPEG frame
-P <padfifo>: take PAD data from the specified FIFO
-b <bitrate>: output bitrate in kbit/s
-j : enable JACK input

Call

toolame -h

for detailed information

Example with alsa input using sox:

sox -t alsa $ALSASRC -b 16 -t raw - rate 48k channels 2 | \
   ../toolame/toolame \
   -s 48  -b $BITRATE /dev/stdin $DST

where $DST is of the form

tcp://<some host running odr-dabmux>:<port>

Taken from this script

Example with stdout as output:

toolame -s 48 -b 128 /dev/stdin /dev/stdout

Reads linear stream from standard input, encode it at 128kbit/s, add 4bytes for DAB PAD and output stream to standard output (this command was typically used, "piped" with other commands for live encoding in a DAB transmission. Now it's better to use the newer ZMQ.)

Example with JACK input and output to ODR-DabMux ZMQ running on localhost

toolame -s 48 -b 128 -j dabenc tcp://localhost:9002

The encoder will create two JACK ports: dabenc:input0 and dabenc:input1

Source code

Get toolame-dab from https://github.com/Opendigitalradio/toolame-dab

git clone https://github.com/Opendigitalradio/toolame-dab.git
cd toolame-dab
make
sudo cp toolame /usr/local/bin

The installed executable is called toolame

The original source for toolame-02l is http://sourceforge.net/projects/toolame/files/

Warning !

A fork of toolame called twolame exists. Despite the fact that the code has been cleaned, twolame has lost DAB support that was present in toolame. So be careful to install toolame-dab and not twolame for DAB tests.