[Speex-dev] st->nb_loudness_adapt removal patch
Thorvald Natvig
speex at natvig.com
Thu Feb 21 06:57:36 PST 2008
Hi,
I've been looking a bit at the VAD/AGC situation. I noticed a leftover
variable declaration. The AGC used to use nb_loudness_adapt to count the
number of frames so far, but it now uses nb_adapt which is shared by all
the functions. However, it still allocates and updates nb_loudness_adapt.
This patch saves 4 bytes of memory and a partial cycle of CPU power ;)
-------------- next part --------------
Index: libspeex/preprocess.c
===================================================================
--- libspeex/preprocess.c (revision 14530)
+++ libspeex/preprocess.c (working copy)
@@ -236,7 +236,6 @@
float *loudness_weight; /**< Perceptual loudness curve */
float loudness; /**< Loudness estimate */
float agc_gain; /**< Current AGC gain */
- int nb_loudness_adapt; /**< Number of frames used for loudness adaptation so far */
float max_gain; /**< Maximum gain allowed */
float max_increase_step; /**< Maximum increase in gain from one frame to another */
float max_decrease_step; /**< Maximum decrease in gain from one frame to another */
@@ -516,7 +515,6 @@
/*st->loudness = pow(AMP_SCALE*st->agc_level,LOUDNESS_EXP);*/
st->loudness = 1e-15;
st->agc_gain = 1;
- st->nb_loudness_adapt = 0;
st->max_gain = 30;
st->max_increase_step = exp(0.11513f * 12.*st->frame_size / st->sampling_rate);
st->max_decrease_step = exp(-0.11513f * 40.*st->frame_size / st->sampling_rate);
@@ -585,7 +583,6 @@
loudness*2 > pow(st->loudness, 1.0/LOUDNESS_EXP))*/
if (Pframe>.3f)
{
- st->nb_loudness_adapt++;
/*rate=2.0f*Pframe*Pframe/(1+st->nb_loudness_adapt);*/
rate = .03*Pframe*Pframe;
st->loudness = (1-rate)*st->loudness + (rate)*pow(AMP_SCALE*loudness, LOUDNESS_EXP);
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