[ID3 Dev] information about Frame decoding

[Brandon Corey]

You don't need any ID3 info to decode the MPEG data..  they're totally
separate.  That said, your request is off topic here, but I'd recommend
getting ahold of the ISO MPEG audio spec (ISO 11172-3).

Brandon

On Sun, Jul 23, 2006 at 04:11:27PM +0200, Torsten Mohr wrote:
> Hi,
> 
> i'm sorry if this is off-topic here, but maybe questions like mine
> are also handled here or somebody can give me help where to search
> for this.
> 
> 
> I'd like to decode an MP3 file.  I can browse the file for the
> synch fields and the data related to it.
> 
> I'd like to decode the frames i've found now to reconstruct the
> raw PCM data.
> 
> There's quite some information about the structure of MP3 files
> available, but not that much about the audio data in the frames.
> 
> 
> What i've understood so far is:
> - the data in the frame may be CRC protected or not
> - i need to Huffman-Decode the frames data
> - what i get then depends on the type of frame, if it is
>   mono, joint-stereo or stereo.
> - the decoded frames represent frequencies and their intensity.
> 
> 
> I now have some questions and it would be great if somebody could
> give me a hints here:
> 
> - Is my understanding described above correct?
> 
> - What ID3 tags do i need to decode the MP3 file?
> 
> - Where can i get more information in detail about the next steps
>   to do (Huffman-decoding and interpretation of the found data)?
> 
> 
> It would be great if anybody could give me a hint here.
> 
> 
> Thanks,
> Torsten.
> 
> 
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