From 84614fd69da71e72fe25181b9b49c0f50f431f42 Mon Sep 17 00:00:00 2001
From: Admir Memic <shimshir@users.noreply.github.com>
Date: Tue, 7 Jul 2015 01:22:34 +0200
Subject: [PATCH] Implemented decimating FIR filter

I didn't understand what is mean by "This function retains the address of the delay filter memory containing the previous delayed values to allow consecutive processing of blocks."
---
 src/dsp/p_firdec.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/dsp/p_firdec.c b/src/dsp/p_firdec.c
index f5d7623..912840d 100644
--- a/src/dsp/p_firdec.c
+++ b/src/dsp/p_firdec.c
@@ -24,7 +24,19 @@
 void p_firdec_f32(const float *x, const float *h, float *r,
                   int nx, int nh, int df)
 {
+	int t;
+	int i;
+	for (t = 0; t < nh; ++t)
+	{
+	 	r[t] = 0;
+		for (i = 0; i <= t && t * df < nx; ++i) 
+			r[t] += h[i] * x[t * df - i];
+	}
 
-    /*PLACE CODE HERE*/
-
+	for (t = nh; t < nx; ++t)
+	{
+		r[t] = 0;
+		for (i = 0; i < nh && t * df < nx; ++i)
+			r[t] += h[i] * x[t * df - i];
+	}
 }