eti-tools

This is a software collection for converting Ensemble Transport Interface used in terrestrial Digital Audio Broadcasting (DAB/DAB+/T-DMB).

The main purpose of these apps is to convert/manupulate ETI-NA/ETI-NI streams (by using pipelines). With these software tools you can create your own IceCast2 internet-radio server which will use your local DAB/DAB+ transmitter as source for the stations streams. You also can re-multiplex some (needed) stations from one ETI-stream to another by using ZeroMQ feature of the ni2http application and ODR-DabMUX.

This software also allows to receive and convert special formatted satellite DAB(+) streams (so-called feeds) into regular ETI-NI which then can be used to play in dablin or even feed modulator software/hardware (check local laws!) or to create internet-station from that source.

Table of Content

• Prerequisitions
• Tools
  • ts2na
  • na2ni
  • edi2eti
  • ni2http

Prerequisitions

Additional libraries are needed:

• libfec - for Reed-Solomon FEC, may be enabled/disabled.
• libshout - for NI-to-HTTP converter (included in this package library is modified to support aac and raw streaming).
• libzmq - optional: for ZeroMQ output of NI-to-HTTP converter (possible re-mux of ETI-streams containing DAB/DAB+ streams). Uncomment it in Makefile if this option is needed.

ts2na

ts2na is a MPEG-TS to ETI-NA converter for satellite DAB(+) feeds.

ts2na_dreambox.c is a special version for Dreambox DM-500S which can be used to tune frontend to specific frequency. On regular PC use dvbstream or MuMuDVB application to dump to ts2na.

usage: ./ts2na [-p pid] [-s offset] [-i <inputfile>] [-o <outputfile>]

Default for offset is 12 bytes. If you get

ERROR: Can't find sync

try one of these (currently in Europe used) values for offset: 0, 12 or -3.

Default for pid is 1062. Values for pid can be any other PID carrying an ETI-NA stream (e.g. 1061) . In case of negative offset (-s -3, see above) this pid argument will be ignored as the DVB-S stream itself is no valid transport stream.

The output stream will be raw PID content = ETI-NA (G.704). The parameter [-s offset] must be seen in MPEG-TS dump, in most cases that is unused 0xFF at the beginning of the each TS-packet's payload.

ETI na2ni

na2ni is a ETI-NA (G.704) to ETI-NI (G.703) converter. This tool automatically detects E1-sync bits in bitstream and inversion flag. Also it extracts ETI-LI content of the stream and incapsulate it into ETI-NI frames. It is possible to disable Reed-Solomon error correction, then conversion speed will be dramatically increased.

usage: ./na2ni [--no-fec] [-i <inputfile>] [-o <outputfile>]

The output stream will be 6144-bytes aligned raw ETI-NI stream (G.703)

ETI edi2eti

edi2eti is a EDI-AF or EDI-PF to ETI-NI converter. This tool automatically detects type of AF/PF packet type. Maximal deinterleaving depth is set to 192ms to prevent high memory usage. Also it extracts ETI-LI content of the stream and incapsulate it into ETI-NI frames.

The tool is able to receive multicast data and save converted stream ETI-file or publish it by ZeroMQ protcol. It is written to convert microwave links (WiFi or raw packet stream) to tcp-zeromq stream useable by EasyDABv2 module.

usage: ./edi2eti [-o <outputfile|zeromq-uri>] [ip:port]

The output stream will be 6144-bytes aligned raw ETI-NI stream or local-port published ZeroMQ packet.

Sample of receiving multicast stream and convert it to ZeroMQ:

./edi2eti -o "zmq+tcp://*:18982"  232.20.10.1:12000

Sample of receiving multicast stream and save it to file:

./edi2eti -o "out.eti"  232.20.10.1:12000

ETI ni2http

ni2http is a ETI-NI to HTTP or ZeroMQ converter. This tool converts eti-stream to mp2 resp. aac and relays it to icecast2 or ODR-DabMUX server.

ETI-NI streams from terrestrial DAB ensembles can also be created by eti-stuff or dabtools. For satellite feeds see above.

usage: ./ni2http [--list] [--delay] [-i <inputfile>] [-c <config_file>]

Use --list option to find SIDs and station names of the streams inside ETI. The --delay option has to be used for offline-relaying (from the file, not from the stream). So in that case application will wait 24ms after each eti frame in order to make pseudo-realtime streaming.

The application is also able to parse FIC for auto-detecting of station name and X-PAD of DAB and DAB+ for setting current DLS (song titles).

Config sample:

[server]
host:       localhost
port:       8000
user:       source
password:   hackme

[channel]
mount:      r5_live
sid:        0xc228

[channel]
name:       Custom channel name2
mount:      r1
sid:        0xc221

[channel]
#stream name will be auto-detected
#name:       Custom channel name3
mount:      r6music
sid:        0xc22b
# extract_pad - use DLS info as icecast metadata, enabled by default
extract_pad: 1
#extract_dabplus - converts DAB+ stream into AAC-ADTS,
#which is playable by the internet-radio players, enabled by default
#If this option is disabled, this stream can be directly passed to ODR-DabMod
extract_dabplus: 1

[channel]
# just write to file, no streaming to server.
sid:        0xc223
extract_pad: 0
file:       /run/station7.fifo

[channel]
# pass DAB/DAB+ stream to ODR-DabMUX.
sid:        0xc224
extract_pad: 0
zmq:       tcp://127.0.0.1:9001

In [server] section the parameters of Icecast2 server must be set. In [channel] sections at least service ID of the channel must be presented.

If you wish to write stream to a file, then use file to specify its location. If stream to Icecast2 server is needed, then specify mount-point on the icecast server.

If you wish to re-stream to ODR-DabMUX then set destination of the ZeroMQ URI to muxing server. To get list of service IDs, use ni2http --list -i <inputfile>

Satellite DAB(+) feeds

This is a list of satellite feeds that you can use with the tool ts2na:

Stream Name	Sat	Freq	SR/FEC	Modulation	PID	SID	Offset	Check
DR 5C	23.5ºE	12641V	1342 5/6	QPSK/DVB-S	--	--	-3	OK
WDR 11D	23.5ºE	12645V	1489 3/4	QPSK/DVB-S	--	--	-3	OK
BR 11D	7.0ºE	12537V	996 2/3	QPSK/DVB-S	1025	??	??	Pending
BBC DAB	4.5ºE	12303H	25546 7/8	QPSK/DVB-S	1061	70	12	OK
D1 DAB	4.5ºE	12303H	25546 7/8	QPSK/DVB-S	1062	60	12	OK
SDL NATL	4.5ºE	12303H	25546 7/8	QPSK/DVB-S	1063	80	12	OK
NRK	1.0ºW	10704V	4200 3/4	8PSK/ACM	MIS=171	??	--	Pending (EDI?)

If you want to use one of these feeds, here's a guide about how to do it (see below for an example):

• Source: You need to capture the feed with a SAT tuner. Our recomendation is to use one of them to stream the feed to a multicast address. Then you can use this stream from any computer on your network (not only the one with the SAT tuner).
  • If your SAT tuner is a SAT>IP server, then you can use this URI for getting an MPEG-TS with the three DAB bitstreams present in the MUX of 4.5ºE:
    • satip://server:554/?src=1&freq=12303&pol=h&msys=dvbs&mtype=qpsk&sr=25546&fec=78 &pids=0,1,16,17,18,20,1061,1062,1063,5060,5070,5080"
• Unpacking: You need to process the multicast stream to obtain the ETI DAB ensemble. You can do this on any computer on your network. The input must be the MPEG-TS and the output will be the ETI-NI bitstream. You can save it in a file, FIFO or PIPE. Required tools: SOCAT, ts2na & na2ni.
• Play: Finally you need to reproduce the DAB ensemble. You can use any DAB player with ETI-NI input support (for example DABlin).

Here an "all-in-one" example:

• Producer: Using the DVBlast tool in a computer with a DVB-S tuner, for streaming all three DAB ensembles from 4.5ºE in 12303-H, to the multicast address udp://@239.1.1.1:1234 from the source address 192.168.1.33 (IP of this computer):
  • dvblast -f 12303000 -s 25546000 -v 18 -S 1 -d "239.1.1.10:[email protected]/udp 1 0 0,1,16,17,18,20,1061,1062,1063,5060,5070,5080"
• Consumer: Use DABlin to consume the MPEG-TS from udp://@239.1.1.1:1234 and tune the ensemble "BBC DAB" at pid 1061:
  • socat UDP4-RECV:5018,bind=239.1.1.10,ip-add-membership=239.1.1.10:eth0,reuseaddr - | ts2na -p 1061 -s 12 | na2ni | dablin -p