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Apply pulses to unscaled coefficients rather than scaled.

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Slight reworking of a patch by Alex Converse (alex converse gmail com)

Originally committed as revision 15314 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse
2008-09-13 20:51:36 +00:00
committed by Robert Swain
parent 408992bae2
commit 5143684891
1 changed files with 9 additions and 2 deletions
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11
libavcodec/aac.c
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@@ -754,12 +754,19 @@ static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBit
}
if (pulse_present) {
idx = 0;
for(i = 0; i < pulse->num_pulse; i++){
float co = coef_base[ pulse->pos[i] ];
while(offsets[idx + 1] <= pulse->pos[i])
idx++;
if (band_type[idx] != NOISE_BT && sf[idx]) {
float ico = -pulse->amp[i];
if (co)
if (co) {
co /= sf[idx];
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 * sf[idx];
}
}
}
return 0;