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" <[EMAIL PROTECTED]> To: "smprocess" <[EMAIL PROTECTED]>; <[email protected]> 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. > | > |-------------------------------------------------------------------------| _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
