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Correct pulse amplitude application - a negative or 0 coefficient implies the

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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
This commit is contained in:
Robert Swain
2008-09-11 01:22:34 +00:00
parent 67ce33162a
commit febcbd65fa
1 changed files with 3 additions and 1 deletions
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4
libavcodec/aac.c
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@ -753,7 +753,9 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
if (pulse_present) { if (pulse_present) {
for(i = 0; i < pulse->num_pulse; i++){ for(i = 0; i < pulse->num_pulse; i++){
float co = coef_base[ pulse->pos[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; coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico;
} }
} }