78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* delay.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2019 Warren Pratt, NR0V
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#ifndef _delay_h
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#define _delay_h
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#define WSDEL 1025 // number of supported whole sample delays
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typedef struct _delay
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{
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int run; // run
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int size; // number of input samples per buffer
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double* in; // input buffer
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double* out; // output buffer
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int rate; // samplerate
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double tdelta; // delay increment required (seconds)
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double tdelay; // delay requested (seconds)
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int L; // interpolation factor
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int ncoef; // number of coefficients
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int cpp; // coefficients per phase
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double ft; // normalized cutoff frequency
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double* h; // coefficients
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int snum; // starting sample number (0 for sub-sample delay)
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int phnum; // phase number
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int idx_in; // index for input into ring
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int rsize; // ring size in complex samples
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double* ring; // ring buffer
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double adelta; // actual delay increment
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double adelay; // actual delay
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CRITICAL_SECTION cs_update;
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} delay, *DELAY;
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extern DELAY create_delay (int run, int size, double* in, double* out, int rate, double tdelta, double tdelay);
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extern void destroy_delay (DELAY a);
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extern void flush_delay (DELAY a);
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extern void xdelay (DELAY a);
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// Properties
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extern void SetDelayRun (DELAY a, int run);
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extern double SetDelayValue (DELAY a, double delay); // returns actual delay in seconds
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extern void SetDelayBuffs (DELAY a, int size, double* in, double* out);
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#endif
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