Add ff_dot_productf() to celp_math.{c,h}

Part of the QCELP patch by Kenan Gillet, kenan.gillet gmail com

Originally committed as revision 15753 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 11 insertions, 0 deletions

diff --git a/libavcodec/celp_math.c b/libavcodec/celp_math.c
index 9fa7dfc70d..df05917d20 100644
--- a/libavcodec/celp_math.c
+++ b/libavcodec/celp_math.c
@@ -195,3 +195,14 @@ int ff_log2(uint32_t value)
 
     return (power_int << 15) + value;
 }
+
+float ff_dot_productf(const float* a, const float* b, int length)
+{
+    float sum = 0;
+    int i;
+
+    for(i=0; i<length; i++)
+        sum += a[i] * b[i];
+
+    return sum;
+}