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Rockbox mail archiveSubject: Re: MPEG Audio formatRe: MPEG Audio format
From: Bluechip <csbluechip_at_gmail.com>
Date: Sat, 14 Jan 2006 02:51:22 +0000 >>Pretty much got a proper core written for an Audio file processor now. >> >>I have another simple question about MPEG Audio files. >> >>Am I ever likely to encounter an MPEG Audio file which will contain AUDIO >>frames which differ in VERSION, LAYER, SAMPLERATE and/or CHANNELS? Eg. >>Some frames are 48KHz and other frames are 44.1KHz ...or some frames in >>Stereo, some in Joint-Stereo? >> >>I have been unable to find any documentation which explicitly states >>whether this should or shouldn't be allowed by the MPEG standard, and >>nothing to say explicitly whether any players do or don't support this >>type of change. > >When it comes to sample rate, layer and version switching, I think you're >reasonably safe, though it is probably legal. Stereo mode I think you will >find encoders may switch from frame to frame. > >Thom Thanks Thom et al. Three people have said this now. So I will assume Ver/Lyr/Smp to be constant and Chn to be variable. As you say, there seems to be no reason for Ver/Lyr/Smp changes to be ILLEGAL, but generating comprehensive statistics for such files would be an output nightmare - so I would rather avoid it if it is relevantly obscure. BC Received on 2006-01-14 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |