Originally committed as revision 21924 to svn://svn.ffmpeg.org/ffmpeg/trunk
// ^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(log2f(10.0) * 0.05 *
+ exp2f(M_LOG2_10 * 0.05 *
(ff_dot_productf(pred_table, prediction_error, 4) +
energy_mean)) /
sqrtf(fixed_mean_energy);
#ifndef M_LN10
#define M_LN10 2.30258509299404568402 /* log_e 10 */
#endif
+#ifndef M_LOG2_10
+#define M_LOG2_10 3.32192809488736218171 /* log_2 10 */
+#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846 /* pi */
#endif