679e43f144
My motivation is to experiment quirc on macOS, where neither of SDL1 or V4L2 work. ``` % brew install opencv % brew install pkg-config % brew install bsdmake % bsdmake quirc-demo-opencv % ./quirc-demo-opencv ``` Note: the macOS version of GNU make (/usr/bin/make) is a bit old for quirc's Makefile.
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* quirc -- QR-code recognition library
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* Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef DTHASH_H_
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#define DTHASH_H_
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#include <stdint.h>
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#include <time.h>
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#include "quirc.h"
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/* Detector hash.
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*
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* This structure keeps track of codes that have been seen within the
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* last N seconds, and allows us to print out codes at a reasonable
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* rate as we see them.
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*/
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#define DTHASH_MAX_CODES 32
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struct dthash_code {
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uint32_t hash;
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time_t when;
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};
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struct dthash {
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struct dthash_code codes[DTHASH_MAX_CODES];
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int count;
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int timeout;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Initialise a detector hash with the given timeout. */
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void dthash_init(struct dthash *d, int timeout);
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/* When a code is discovered, this function should be called to see if
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* it should be printed. The hash will record having seen the code, and
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* return non-zero if it's the first time we've seen it within the
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* configured timeout period.
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*/
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int dthash_seen(struct dthash *d, const struct quirc_data *data);
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#ifdef __cplusplus
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}
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#endif
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#endif
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