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Subject: Re: replaygain and id3v2 / RGAD tag?

Re: replaygain and id3v2 / RGAD tag?

From: BlueChip <cs_bluechip_at_webtribe.net>
Date: 2005-08-10

AHA! I had not previously realised a difference between MP3Gain and
ReplayGain ...thanks for correcting me :)

BC

>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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Received on Wed Aug 10 20:16:45 2005


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