Add FLAC ReplayGain decoding discussion to replay gain post.

diff --git a/posts/Replay_gain.mdwn b/posts/Replay_gain.mdwn
index 61311c8826033410fc22f7b19baa5b27c3e8a68d..b067c9ca6ae407f07c674fbb82d16426a8588be4 100644 (file)
--- a/posts/Replay_gain.mdwn
+++ b/posts/Replay_gain.mdwn
@@ -9,9 +9,32 @@ scripts for tagging FLAC files][post] (the heart of his scripts is
 
     replaygain "album"
 
-to `/etc/mpd.conf` and restart `mpd`.  Voilà!
+to `/etc/mpd.conf` and restart [[mpd]].  Voilà!
 
-[post]: http://www.bobulous.org.uk/misc/Replay-Gain-in-Linux.html
+If you're not using `mpd`, modern versions of [flac][] come with an
+undocumented `--apply-replaygain-which-is-not-lossless` option.  It's
+annoying that they haven't gotten around to documenting this option
+(since 2004!), but the syntax itself is pretty simple (description
+from [this post][syntax]):
+
+    --apply-replaygain-which-is-not-lossless[=<specification>]
+
+where `<specification>` has the format:
+
+    [<preamp>][a|t][l|L][n{0|1|2|3}]
 
+    <preamp>    Floating point dB to add to the existing gain.
+    a|t         Album (a) or track (t) gain.
+    l|L         Peak-limit (l) or 6dB hard limiter (L)
+    n{0|1|2|3}  Noise shaping from none (0) to strong (3) when
+                dithering back to integer amplitudes.
+
+The default is `0aLn1`.  If you look in the `flac` source, this
+documentation is in `doc/html/documentation_tools_flac.html` (where it
+is commented out).
+
+[post]: http://www.bobulous.org.uk/misc/Replay-Gain-in-Linux.html
+[flac]: http://flac.sourceforge.net/
+[syntax]: http://www.hydrogenaudio.org/forums/index.php?showtopic=17293&pid=171075&mode=threaded&start=#entry171075
 [[!tag tags/linux]]
 [[!tag tags/fun]]