From c8dcb9dee1c5f337dc97f805eb868207064252e9 Mon Sep 17 00:00:00 2001
From: Nathan Caldwell <saintdev@gmail.com>
Date: Wed, 27 Oct 2010 06:36:47 +0000
Subject: [PATCH] aacenc: Remove energy 'normalization' modification from the
3GPP psymodel
This greatly improves bitrate handling. You will now get within a few
kbps of your requested bitrate instead of 20-40kbps higher.
There is absolutely no analog to this line in the 3GPP spec, that I
can find.
patch by Nathan Caldwell saintdev (at) gmail
Originally committed as revision 25589 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/aacpsy.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/libavcodec/aacpsy.c b/libavcodec/aacpsy.c
index 77eebb92d78..a3618ce57f9 100644
--- a/libavcodec/aacpsy.c
+++ b/libavcodec/aacpsy.c
@@ -404,7 +404,6 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel,
band->energy = 0.0f;
for (i = 0; i < band_sizes[g]; i++)
band->energy += coefs[start+i] * coefs[start+i];
- band->energy *= 1.0f / (512*512);
band->thr = band->energy * 0.001258925f;
start += band_sizes[g];
--
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