ODR-DabMux
From Opendigitalradio
(Difference between revisions)
(→Patch to increase page size) |
m (added link) |
Revision as of 10:00, 24 February 2012
CRC-DabMux is the free open source DAB Multiplexer developed by Communication Research Center (CRC) from Canada. It is used in command line.
Contents |
More information
Description can be found on http://mmbtools.crc.ca/content/view/39/65/
Source code is now released (since September 2008).
Build information
When building from the source code, be careful to disable debugging, otherwise there will be lot of wasted CPU usage:
./configure --with-debug-malloc=no --disable-debug
CRC-DabMux depend on libfec from Phil Karn. From recent versions of Ubuntu (10.04) or 64bits, libfec has a compilation error (" fec.h:267: Error: bad register name `%dil' ").
Pascal Charest, from CRC, has written a workaround for it that you can find on libfec section of CRC-DABMUX page.
Here's a workaround detail, on line 267 from fec.h: Replace
__asm__ __volatile__ ("test %1,%1;setpo %0" : "=g"(x) : "r" (x));
by
__asm__ __volatile__ ("test %1,%1;setpo %0" : "=q"(x) : "q" (x));
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
CRC-DabMux Man page
NAME
CRC-DabMux - A software DAB multiplexer
SYNOPSYS
CRC-DabMux [ensemble] [subchannel1 subchannel2 ...] [service1 component1 [component2 ...] service2 ...] [output1 ...] [-h] [-m mode] [-n nbFrames] [-o] [-V] [-z]
Where ensemble = [-i ensembleId] [-L label] [-l sLabel]
Where subchannel = -(A | B | D | E | F | M | P | T) inputName [-b bitrate] [-i subchannelId] [-k] [-p protection]
Where service = -S [-g language] [-i serviceId] [-L label] [-l sLabel] [-y PTy]
Where component = -C [-a address] [-d] [-f figType] [-i subchannelId] [-L label] [-l sLabel] [-t type]
DESCRIPTION
CRC-DabMux is a software multiplexer that generates an ETI stream from audio and data streams. Because of its software based architecture, many typical DAB services can be generated and multiplexed on a single PC platform with live or pre-recorded sources.
A DAB multiplex configuration is composed of one ensemble. An ensemble is the entity that receivers tune to and process. An ensemble contains several services. A service is the listener-selectable output. Each service contains one mandatory service component which is called pri- mary component. An audio primary component define a program service while a data primary component define a data service. Service can con- tain additional components which are called secondary components. Maxi- mum total number of components is 12 for program services and 11 for data services. A service component is a link to one subchannel (of Fast Information Data Channel). A subchannel is the physical space used within the common interleaved frame.
__________________________________________________
| CRC-Ensemble | ENSEMBLE
|__________________________________________________|
| | |
| | |
_______V______ _______V______ _______V______
| CRC-Service1 | | CRC-Service2 | | CRC-Service3 | SERVICES
|______________| |______________| |______________|
| | | | |______ |
| | | | | |
__V__ __V__ __V__ __V__ __V__ __V__
| SC1 | | SC2 | | SC3 | | SC4 | | SC5 | | SC6 | SERVICE
|_____| |_____| |_____| |_____| |_____| |_____| COMPONENTS
| | _____| | | ____|
| | | | | |
__V________V__V______________V________V___V_______ COMMON
| SubCh1 | SubCh9 | ... | SubCh3 | SubCh60 | ... | INTERLEAVED
|________|________|_______|________|_________|_____| FRAME
Figure 1: An example of a DAB multiplex configuration
GENERAL OPTIONS
-h : get this help -m : DAB mode (default: 2) -n nbFrames : number of frames to produce -o : turn on TCP log on port 12222 -V : print version information and exit -z : write SCCA field for Factum ETI analyzer
INPUT OPTIONS
-A : set audio service
-A : set CRC-Bridge data service
-D : set data service
-E : set enhanced packet service
-F : set DAB+ service
-M : set DMB service
-P : set packet service
-T : set test service
inputName<n> : name of file for audio and packet service and Udp input address for data service ([address]:port)
-a : packet address (default: 0x200 (512))
-b bitrate<n> : bitrate (in kbits/s) of the subchannel (default: audio 1st frame, data 384, packet 32)
-d : turn on datagroups in packet mode
-f figType : user application type in FIG 0/13 for packet mode
-g language : Primary service component language: english=9, french=15
-i id<n> : service|subchannel|serviceComponent id <n> (default: <n>)
-k : set non-blocking file input (audio and packet only)
-L label<n> : label of service <n> (default: CRC-Audio<n>)
-l sLabel<n> : short label flag of service <n> (default: 0xf040)
-p protection<n> : protection level (default: 3)
-t type : audio/data service component type (default: 0)
audio: foreground=0, background=1, multi-channel=2
data: unspecified=0, TMC=1, EWS=2, ITTS=3, paging=4, TDC=5, IP=59, MOT=60, proprietary=61
-y PTy : Primary service component program type international code
OUTPUT OPTIONS
-O output : name of the output in format scheme://[address][:port][/name]
where scheme is (raw|udp|tcp|file|fifo|simul)
