ODR-DabMux

ODR-DabMux is a free open source DAB Multiplexer initially developed by Communication Research Center (CRC) from Canada, and subsequently forked by opendigitalradio. It is a command line tool.

The development is done publicly on GitHub with releases available ad interim on http://mpb.li

The main communication channel is the CRC-mmbTools Google Group mailing list

This page describes how to compile and use odr-dabmux.

Build information for ODR-DabMux

Prerequisites

Boost

You will need to install Boost at least version 1.42. The one from your distribution is probably fine, and if you have installed GNURadio or UHD, you will already have it.

For example on Debian:

apt-get install libboost-all-dev

ZeroMQ

If you want to use the zeromq inputs or outputs, you need a recent (4.0.4 is best) version of ZeroMQ. It is probably preferred to install it from source:

wget http://download.zeromq.org/zeromq-4.0.4.tar.gz
tar -zxvf zeromq-4.0.4.tar.gz
cd zeromq-4.0.4
./configure
make
sudo make install

This will install it into /usr/local

LibFEC

ODR-DabMux also depends on libfec from Phil Karn. On 64-bit machines, the original libfec doesn't compile (" fec.h:267: Error: bad register name `%dil' "). A patched version that compiles on x86_64 (and even on ARM) is available on GitHub (.zip)

Compilation

Once the prerequisites are installed, download ODR-DabMux from the package or git

git clone https://github.com/Opendigitalradio/ODR-DabMux
cd ODR-DabMux
./bootstrap.sh

then in the ODR-DabMux directory do

./configure --enable-input-zeromq --enable-output-zeromq
make
sudo make install

or, if you don't have zeromq:

./configure
make
sudo make install

then you can execute, as a test

odr-dabmux -h

Each time you update from the git repository (either git checkout or git pull) you should do

./bootstrap.sh

to re-generate the autotools scripts and generate the ./configure script

Usage

There are two ways to use ODR-DabMux: with command line arguments or with a configuration file.

Command line interface

There are quite many arguments and options, and the best is to read the manpage (man odr-dabmux) first, and then to look at some examples (e.g. mux-throttled.sh)

Configuration file

The full configuration can also be specified in a configuration file.

The example configuration file that is included in doc (example.mux) contains an example with a multiplex consisting of two services. The example file is commented, and is a good example to build your own.

To run odr-dabmux with a configuration file, run

odr-dabmux -e my_config.mux

Additional information

More information

Documentation and descriptions on CRC-DabMux can be found on http://mmbtools.crc.ca/content/view/39/65/

The last version published by CRC is version 0.3.0.4, on which the latest developments are based.

Patch to increase page size

Some glitches have been noticed on some machines. They are due to underruns in the FIFO. This patch increases the buffer sizes in the mux. wrning, this patch will also increase the delay. To apply it use, the patch command. (for CRC-DabMux <= 0.3.0.4)

--- src/dabInputFifo.cpp.org	2011-09-27 10:08:35.202323204 -0400
+++ src/dabInputFifo.cpp	2011-09-27 10:13:57.638315966 -0400
@@ -169,11 +169,12 @@
     if (data->buffer != NULL) {
         delete data->buffer;
     }
-    if (size == 0) {
-        size = 1024;
-    }
-    data->buffer = new unsigned char[size * 16];
     data->maxSize = size * 16;
+    int minSize = 2*getpagesize();
+    while (data->maxSize < minSize) {
+        data->maxSize += size;
+    }
+    data->buffer = new unsigned char[data->maxSize];
 #ifdef _WIN32
     ReleaseSemaphore(data->semBuffer, 1, NULL);
 #else

See the manpage for more info:

• CRC-DabMux man page
• or, of course, man odr-dabmux