From 1fb0d4b8a65bc0b631ea2afdb2e0b80800efe82f Mon Sep 17 00:00:00 2001
From: Kenan Gillet <kenan.gillet@gmail.com>
Date: Thu, 30 Oct 2008 21:05:37 +0000
Subject: Add a LPC filter Part of the QCELP patch by Kenan Gillet,
 kenan.gillet gmail com

Originally committed as revision 15754 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/celp_filters.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'libavcodec/celp_filters.c')

diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c
index 758c9b0a90..3d983c4f75 100644
--- a/libavcodec/celp_filters.c
+++ b/libavcodec/celp_filters.c
@@ -84,3 +84,24 @@ int ff_celp_lp_synthesis_filter(
 
     return 0;
 }
+
+void ff_celp_lp_synthesis_filterf(
+        float *out,
+        const float* filter_coeffs,
+        const float* in,
+        int buffer_length,
+        int filter_length)
+{
+    int i,n;
+
+    // These two lines are to avoid a -1 subtraction in the main loop
+    filter_length++;
+    filter_coeffs--;
+
+    for(n=0; n<buffer_length; n++)
+    {
+        out[n] = in[n];
+        for(i=1; i<filter_length; i++)
+            out[n] += filter_coeffs[i] * out[n-i];
+    }
+}
-- 
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