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Diffstat (limited to 'libavcodec/acelp_pitch_delay.c')
-rw-r--r--libavcodec/acelp_pitch_delay.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/libavcodec/acelp_pitch_delay.c b/libavcodec/acelp_pitch_delay.c
index c2155a5c0c..66d65a6903 100644
--- a/libavcodec/acelp_pitch_delay.c
+++ b/libavcodec/acelp_pitch_delay.c
@@ -105,9 +105,20 @@ int16_t ff_acelp_decode_gain_code(
for(i=0; i<ma_pred_order; i++)
mr_energy += quant_energy[i] * ma_prediction_coeff[i];
+#ifdef G729_BITEXACT
+ mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
+
+ mr_energy = (5439 * (mr_energy >> 15)) >> 8; // (0.15) = (0.15) * (7.23)
+
+ return bidir_sal(
+ ((ff_exp2(mr_energy & 0x7fff) + 16) >> 5) * (gain_corr_factor >> 1),
+ (mr_energy >> 15) - 25
+ );
+#else
mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) /
sqrt(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0));
return mr_energy >> 12;
+#endif
}
float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,