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lavc/acelp_pitch_delay: replace exp2f(M_LOG2_10 *x) by ff_exp10f(x)

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Suggested-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-12-23 12:24:44 -08:00
parent 25ae086db2
commit 0abdcae5a9
1 changed files with 2 additions and 1 deletions
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3
libavcodec/acelp_pitch_delay.c
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@ -22,6 +22,7 @@
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
@ -132,7 +133,7 @@ float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,
// ^g_c = ^gamma_gc * 100.05 (predicted dB + mean dB - dB of fixed vector)
// Note 10^(0.05 * -10log(average x2)) = 1/sqrt((average x2)).
float val = fixed_gain_factor *
exp2f(M_LOG2_10 * 0.05 *
ff_exp10(0.05 *
(avpriv_scalarproduct_float_c(pred_table, prediction_error, 4) +
energy_mean)) /
sqrtf(fixed_mean_energy);