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delay.h

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+/*	delay.h
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2013, 2019 Warren Pratt, NR0V
+
+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.
+
+The author can be reached by email at
+
+warren@wpratt.com
+
+*/
+
+#ifndef _delay_h
+#define _delay_h
+
+#define WSDEL	1025	// number of supported whole sample delays
+
+typedef struct _delay
+{
+	int run;			// run
+	int size;			// number of input samples per buffer
+	double* in;			// input buffer
+	double* out;		// output buffer
+	int rate;			// samplerate
+	double tdelta;		// delay increment required (seconds)
+	double tdelay;		// delay requested (seconds)
+
+	int L;				// interpolation factor
+	int ncoef;			// number of coefficients
+	int cpp;			// coefficients per phase
+	double ft;			// normalized cutoff frequency
+	double* h;			// coefficients
+	int snum;			// starting sample number (0 for sub-sample delay)
+	int phnum;			// phase number
+
+	int idx_in;			// index for input into ring
+	int rsize;			// ring size in complex samples
+	double* ring;		// ring buffer
+
+	double adelta;		// actual delay increment
+	double adelay;		// actual delay
+
+	CRITICAL_SECTION cs_update;
+
+} delay, *DELAY;
+
+extern DELAY create_delay (int run, int size, double* in, double* out, int rate, double tdelta, double tdelay);
+
+extern void destroy_delay (DELAY a);
+
+extern void flush_delay (DELAY a);
+
+extern void xdelay (DELAY a);
+
+// Properties
+
+extern void SetDelayRun (DELAY a, int run);
+
+extern double SetDelayValue (DELAY a, double delay);		// returns actual delay in seconds
+
+extern void SetDelayBuffs (DELAY a, int size, double* in, double* out);
+
+#endif