Re: [LAD] DAB Audio frame decoder

Fred,

It's exactly what I was thinking to do. In my case, decoding MPEG audio part
is easy. I have just to extract and to decode PAD now.
I found a book which explains the PAD part: "Digital Audio Broadcasting:
Principles and Applications".
Thank for your time.

Regards,

Sylvain

----- Original Message -----
From: "Fred Gleason" <fredg@email-addr-hidden>
To: "smprocess" <machel@email-addr-hidden>;
<linux-audio-dev@email-addr-hidden>
Sent: Wednesday, October 29, 2008 2:16 PM
Subject: Re: [LAD] DAB Audio frame decoder

> On Wednesday 29 October 2008 05:18:34 am smprocess wrote:
>> The audio stream that I would like to decode is composed of MPEG frame +
>> PAD (ancillary data). Of course, I could separate both parts and decode
>> them in two process.
>> Because I didn't find API to do this, I think that I will do it my self.
>
> I'd start by looking in the LibMad sources. Extracting the raw ancillary
> data
> from L2 frames is pretty straightforward (unlike L3, where the bitstream
> must
> be partially uncompressed first). Another doc that may be of some help
> is:
>
> http://www.audioscience.com/internet/download/notes/note0001_MPEG_energy.pdf
>
> Not PAD specific, but it does illustrate one technique for accessing the
> ancillary channel.
>
> Cheers!
>
>
> |-------------------------------------------------------------------------|
> | Frederick F. Gleason, Jr. | Chief Developer
> |
> | | Paravel Systems
> |
> |-------------------------------------------------------------------------|
> | Fresco's Discovery:
> |
> | If you knew what you were doing you'd probably be bored.
> |
> |-------------------------------------------------------------------------|

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Received on Wed Oct 29 16:15:02 2008