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Re: [Discuss-gnuradio] [GSoC 17] DAB: Updates

From: Matthias Brändli
Subject: Re: [Discuss-gnuradio] [GSoC 17] DAB: Updates
Date: Thu, 24 Aug 2017 14:35:00 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

Hello Marcus, Hello all,

On 19/08/17 15:00, Marcus Müller wrote:
> So, if you'd want to wrap that, you'd be very much more than welcome! In
> fact, I'd head over to [1], and look at mp4_encode_sb , rip out the DAB+
> specific parametrizations and put in the DRM specific ones (but I'm,
> alas, not aware which those are).

FDK-AAC defines additional AOTs that are DRM+ specific, in the same way
it does for DAB+. The code even contains some remnants of DRM+ logic,
but I cannot assess how much is missing. It should be possible to modify
the library to be compatible with both DAB+ and DRM.

The frame lengths might be the same because both use the 960 transform
length, however the framing at the output is probably different, as we
had to add the DAB+ one.

I'd be happy to accepts patches for this against the fdk-aac fork at

Supporting an open-source implementation of DRM+ is very much in-line
with the goals of the Opendigitalradio association!


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