From 0c50f8e6ccda2ff0b265d36412fae103b276af2e Mon Sep 17 00:00:00 2001 From: "Reynaldo H. Verdejo Pinochet" Date: Wed, 4 Nov 2009 19:29:29 +0000 Subject: Implement ff_scale_vector_to_given_sum_of_squares() to aid generic gain control routines. Changes for qcelp are included. Patch Collin McQuillan. Originally committed as revision 20450 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/acelp_vectors.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'libavcodec/acelp_vectors.c') diff --git a/libavcodec/acelp_vectors.c b/libavcodec/acelp_vectors.c index 2d9aa1ad79..e6979205b9 100644 --- a/libavcodec/acelp_vectors.c +++ b/libavcodec/acelp_vectors.c @@ -22,6 +22,7 @@ #include #include "avcodec.h" +#include "celp_math.h" #include "acelp_vectors.h" #include "celp_math.h" @@ -177,3 +178,14 @@ void ff_adaptative_gain_control(float *buf_out, float speech_energ, *gain_mem = mem; } + +void ff_scale_vector_to_given_sum_of_squares(float *out, const float *in, + float sum_of_squares, const int n) +{ + int i; + float scalefactor = ff_dot_productf(in, in, n); + if (scalefactor) + scalefactor = sqrt(sum_of_squares / scalefactor); + for (i = 0; i < n; i++) + out[i] = in[i] * scalefactor; +} -- cgit v1.2.3