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aacenc: Remove energy 'normalization' modification from the 3GPP psymodel

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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
This commit is contained in:
Nathan Caldwell 2010-10-27 06:36:47 +00:00 committed by Anton Khirnov
parent 4df5aebb81
commit c8dcb9dee1
1 changed files with 0 additions and 1 deletions
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libavcodec/aacpsy.c
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@ -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];