From: Frederic Devernay <frederic.devernay_at_m4x.org>
Date: Wed, 10 Aug 2005 19:35:13 +0200

err... MP3Gain (not ReplayGain) stores the ReplayGain gain (rounded to the
closest 0.5dB) in each MP3 packet and adds replaygain info (as APEv2 tags, which
still aren't yet supported by rockbox but ask me for a patch) to the file.

ReplayGain is just the way you compute these gains (using the so-called "equal
loudness" heuristic) plus some recommendations on how to store this in a few
file formats:
http://replaygain.hydrogenaudio.org/file_format.html
(this link was in my original message)

-MPC, Ogg and APE have native ReplayGain support.

-MP3 has no native support for the ReplayGain tags (thus the use of mp3gain is
recommended), but such tags can be read by the player from the id3v2 or APEv2
tags. Rockbox supports id3v2 tags. Foobar2000 supports APEv2 and id3v2 tags.

-for WAV, you can either use APEv2 tags (anything after the end of the "data"
chunk should be ignored), of store the gains in an extra RIFF chunk.

Fred

BlueChip wrote:
>
>>> I would need that part which parses binary replaygain info to
>>> implement replaygain on WAV files too, so if id3v2 should use it also
>>> then that binary parsing function should be done in replaygain.c I
>>> guess.
>>
>>
>> Where would the tag be stored for wavs? But extracting the values from
>> the RGAD frame and converting them to something usable for
>> replaygain.c should be easy enough... (And I'll soon commit something
>> that should make it a little bit easier :).
>
>
> ReplayGain is a tool to tweak MP3 packet headers, as such it only works
> with MP3's. I suppose you could implements a system that will work with
> WAV files, but it will not be "ReplayGain" it will be "Magnus' WavGain"
> - although if Rockbox pick it up as a new standard, it might stand a
> chance of reaching the public eye :)
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>
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Received on 2005-08-10