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| author | Robert Swain <robert.swain@gmail.com> | 2008-09-11 01:22:34 +0000 |
|---|---|---|
| committer | Robert Swain <robert.swain@gmail.com> | 2008-09-11 01:22:34 +0000 |
| commit | febcbd65fa3d00cfdfbfabd1c2a8fb8e659e1ca1 (patch) | |
| tree | 01960d9d11d592e4433a88a95ee157f87a25569c /libavcodec/aac.c | |
| parent | 67ce33162aa93bee1a5f9e8d6f00060329fa67da (diff) | |
Correct pulse amplitude application - a negative or 0 coefficient implies the
pulse is subtracted, else it is added. Also avoid a divide by 0.
Based on a patch by Alex Converse (alex converse gmail com)
Fixes part of issue632
Originally committed as revision 15294 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/aac.c')
| -rw-r--r-- | libavcodec/aac.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libavcodec/aac.c b/libavcodec/aac.c index c59a663bec..cc069ed7c6 100644 --- a/libavcodec/aac.c +++ b/libavcodec/aac.c @@ -753,7 +753,9 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit if (pulse_present) { for(i = 0; i < pulse->num_pulse; i++){ float co = coef_base[ pulse->pos[i] ]; - float ico = co / sqrtf(sqrtf(fabsf(co))) + pulse->amp[i]; + float ico = -pulse->amp[i]; + if (co) + ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico); coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico; } } |