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diff --git a/cinelerra-5.1/plugins/timestretch/timestretchengine.h b/cinelerra-5.1/plugins/timestretch/timestretchengine.h
new file mode 100644
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+++ b/cinelerra-5.1/plugins/timestretch/timestretchengine.h
@@ -0,0 +1,74 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef TIMESTRETCHENGINE_H
+#define TIMESTRETCHENGINE_H
+
+#include "samples.inc"
+#include <stdint.h>
+
+
+class TimeStretchEngine
+{
+public:
+// scale = out length / in length
+	TimeStretchEngine(double scale, int sample_rate, int window_time);
+	~TimeStretchEngine();
+
+	void reset();
+	void update(double scale, int sample_rate, int window_time);
+	void overlay(double *out, double *in, int size, int skirt);
+// Returns the number of samples in the output buffer
+	int process(Samples *in_buffer, int in_size);
+	int get_output_size();
+// Return the output buffer
+	double* get_samples();
+// Increment output buffer counters and shift output
+	void read_output(Samples *buffer, int size);
+
+private:
+// ms length of average window
+	int window_time;
+	int sample_rate;
+	int window_size;
+// Queer eye for the straight buffer
+	int window_skirt;
+	double *output;
+	int output_allocation;
+	int output_size;
+// Sample at beginning of output buffer
+	int64_t output_sample;
+	double *input;
+	int input_allocation;
+	int input_size;
+// Sample at beginning of input buffer
+	int64_t input_sample;
+	double scale;
+};
+
+
+
+
+
+#endif
+
+
+