1 files changed, 61 insertions, 0 deletions
diff --git a/noatun-plugins/nexscope/convolve.h b/noatun-plugins/nexscope/convolve.h
new file mode 100644
index 0000000..4940c62
--- /dev/null
+++ b/noatun-plugins/nexscope/convolve.h
@@ -0,0 +1,61 @@
+/* convolve.h: Header for convolutions.
+ *
+ *  Copyright (C) 1999 Ralph Loader <suckfish@ihug.co.nz>
+ *
+ *  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 program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef CONVOLVE_H
+#define CONVOLVE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* convolve_match takes two blocks, one twice the size of the other.  The
+ * sizes of these are CONVOLVE_BIG and CONVOLVE_SMALL respectively. */
+#define CONVOLVE_DEPTH 8
+#define CONVOLVE_SMALL (1 << CONVOLVE_DEPTH)
+#define CONVOLVE_BIG (CONVOLVE_SMALL * 2)
+
+typedef union stack_entry_s
+{
+	struct {const double * left, * right; double * out;} v;
+	struct {double * main, * null;} b;
+
+} stack_entry;
+
+#define STACK_SIZE (CONVOLVE_DEPTH * 3)
+
+typedef struct convolve_state {
+	double left [CONVOLVE_BIG];
+	double right [CONVOLVE_SMALL * 3];
+	double scratch [CONVOLVE_SMALL * 3];
+	stack_entry stack[STACK_SIZE];
+} convolve_state;
+
+
+convolve_state *convolve_init (void);
+void convolve_close (convolve_state * state);
+
+int convolve_match (float * lastchoice,
+		    float * input,
+		    convolve_state * state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif