From b5716df4cb2837bbbc42195cf1aefcf03e21d6a6 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Fri, 24 Jun 2011 01:25:21 -0400
Subject: Build librbcodec with DSP and metadata.

All associated files are moved to /lib/rbcodec.

Change-Id: I572ddd2b8a996aae1e98c081d06b1ed356dce222
---
 lib/rbcodec/dsp/eq.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 lib/rbcodec/dsp/eq.h

(limited to 'lib/rbcodec/dsp/eq.h')

diff --git a/lib/rbcodec/dsp/eq.h b/lib/rbcodec/dsp/eq.h
new file mode 100644
index 0000000000..a44e9153ac
--- /dev/null
+++ b/lib/rbcodec/dsp/eq.h
@@ -0,0 +1,50 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006-2007 Thom Johansen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _EQ_H
+#define _EQ_H
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+/* These depend on the fixed point formats used by the different filter types
+   and need to be changed when they change.
+ */
+#define FILTER_BISHELF_SHIFT 5
+#define EQ_PEAK_SHIFT 4
+#define EQ_SHELF_SHIFT 6
+
+struct eqfilter {
+    int32_t coefs[5];        /* Order is b0, b1, b2, a1, a2 */
+    int32_t history[2][4];
+};
+
+void filter_shelf_coefs(unsigned long cutoff, long A, bool low, int32_t *c);
+void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high,
+                          long A_low, long A_high, long A, int32_t *c);
+void eq_pk_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
+void eq_ls_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
+void eq_hs_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
+void eq_filter(int32_t **x, struct eqfilter *f, unsigned num,
+               unsigned channels, unsigned shift);
+
+#endif
+
-- 
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