Support and General Use > Audio Playback, Database and Playlists

ReplayGain Implementation

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Carson Dyle:
Does Rockbox read and utilize ReplayGain peak fields, perhaps to avoid clipping?

REPLAYGAIN_TRACK_PEAK
REPLAYGAIN_ALBUM_PEAK

Or does it only use the gain values?

REPLAYGAIN_TRACK_GAIN
REPLAYGAIN_ALBUM_GAIN

What about reference loudness?

REPLAYGAIN_REFERENCE_LOUDNESS

tpijag:
Gain type and whether to protect from clipping is up to you - via the settings.
Regarding reference loudness, I assume that is adjusted via pre-amp settings.

For the sansa clip that I use it is all in the manual. http://download.rockbox.org/daily/manual/rockbox-sansaclip/rockbox-buildch7.html#x10-1220007.7

Carson Dyle:
Right, I'm aware of the available settings.  I was just wondering whether the other RG values are used in the implementation or if they were ignored.

saratoga:

--- Quote from: Carson Dyle on December 14, 2010, 09:41:00 PM ---Right, I'm aware of the available settings.  I was just wondering whether the other RG values are used in the implementation or if they were ignored.

--- End quote ---

You can't prevent clipping without using the PEAK tag.  Literally whats done is that you take the peak tag and compare it to 1.  If its greater, you divide every sample in the song by that amount.  If you don't have that tag theres no way to avoid clipping (since you have no idea if the song is going to clip).

Carson Dyle:

--- Quote from: saratoga on December 15, 2010, 12:05:20 AM ---You can't prevent clipping without using the PEAK tag.  Literally whats done is that you take the peak tag and compare it to 1.
--- End quote ---

Thanks. Are you talking about the raw value of the PEAK fields or some computed value?  The RG track and album PEAK values can't be greater than 1.

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