DAB/DAB+ encoding

Revision as of 01:05, 29 December 2010

Encoding the sound to MPEG-2 Layer II for DAB, MPEG-4 HE-AACv2 for DAB+ or video in MPEG-4 H.264 for T-DMB beforefeeding it to the multiplexer.

DAB audio encoding with toolame

• toolame MPEG-Layer II encoder (DAB)

mpg123 input

toolame can take a file or a raw PCM stream as input.

• mpg123 can be used to take Internet radio stream and convert them from mp3 to raw PCM samples. Be careful, it has been noticed that earlier version have a memory leak when resampling. We use version 1.4.3 to avoid the problem.

Example that decode an mp3 stream, resample it to 48kHz and output the raw samples to stdout:

mpg123 -b 1024 -r 48000 -s http://maxxima.mine.nu:8000

DAB+ audio encoding with crc-dabplus

• CRC-dabplus HE-AAC encoder (DAB+) from CRC (warning, it is not free/open source because of royalty)

jack input

Example of jackplug input (ALSA emulation), encoding at 48kbps, output to a FIFO file:

crc-dabplus -i card://jackplug -c 2 -b 48 -o file://2.ff

Tools for data services encoding

• CRC-Slideshow : slideshow generator from CRC. TO BE DOCUMENTED.
• DAB-EPG API from Global Radio Labs