Is it possible to decode one single frame of MP3 data (all of main data from
previous frame(s) concatenated) to 1152 samples of PCM, and then encode it to
just one MP3 frame with LAME?
Well, it is quite problematic because mp3 is using mdct, and this is an overlapping transform.
I'm developing an application that would reencode only those frames that don't
have coupled blocks in L & R channel (problem with HW players), but I have
noticed that LAME has some ENC/DEC delays, and that worries me.
It will not be a single frame. In current Lame, this would be at least 3 granules. Short blocks need transition blocks before and after, so you have (minimal case) the following succession of sizes: long - start - short - stop - long.
You need to change the whole start-short-stop sequence.
My suggestion would be the following:
*Decode the whole bitstream to pcm
*correct the offsets if needed in the pcm stream
*encode it again in full stereo
*do your cooking/mixing between the original mp3 and the new frames that you can grab from the new mp3.
Regards,
--
Gabriel Bouvigne www.mp3-tech.org personal page: http://gabriel.mp3-tech.org
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