ODR-DabMux
CRC-DabMux is the free open source DAB Multiplexer developed by Communication Research Center (CRC) from Canada. It is a command line tool.
CRC have stopped releasing new versions, and it has been forked by Opendigitalradio, and this page will be updated in the next few days to reflect this change. The development now continues on GitHub with releases available ad interim on http://mpb.li
This page describes how to compile and use crc-dabmux.
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More information
Description 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.
Build information for CRC-DABMUX-0.3.0.4-mpb
Prerequisites
You will need 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.
If you want to use the zeromq inputs or outputs, you need a recent (4.0.3 is best) version of ZeroMQ. It is probably preferred to install it from source:
wget http://download.zeromq.org/zeromq-4.0.3.tar.gz cd zeromq-4.0.3 ./configure make sudo make install
This will install it into /usr/local
Then, get the zmq C++ bindings:
wget https://raw2.github.com/zeromq/cppzmq/master/zmq.hpp sudo cp zmq.hpp /usr/local/include
(alternatively, you can git clone https://github.com/zeromq/cppzmq.git)
CRC-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, do
./configure --with-debug-malloc=no --disable-debug --enable-input-zeromq --enable-output-zeromq make sudo make install
or, if you don't have zeromq:
./configure --with-debug-malloc=no --disable-debug make sudo make install
then you can execute, as a test
crc-dabmux -h
When building, be careful to disable debugging, otherwise there will be lot of wasted CPU usage.
Compilation from the git repository
If you cloned the git repository, you might need to call
./bootstrap.sh
to re-generate the autotools scripts and generate the ./configure script
After that, it's the same as above
Usage
There are two ways to use CRC-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 crc-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 crc-dabmux with a configuration file, run
crc-dabmux -e my_config.mux
Additional information
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:
