a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/* spkmodem-recv.c - decode spkmodem signals */
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/*
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* Copyright (C) 2013 Vladimir 'phcoder' Serbinenko
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*
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* spkmodem-recv is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* spkmodem-recv 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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Compilation: gcc -o spkmodem-recv spkmodem-recv */
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/* Usage: parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */
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#define SAMPLES_PER_TRAME 240
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#define FREQ_SEP_MIN 5
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#define FREQ_SEP_MAX 15
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#define FREQ_DATA_MIN 15
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#define FREQ_DATA_THRESHOLD 25
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#define FREQ_DATA_MAX 60
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#define THRESHOLD 500
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#define DEBUG 0
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#define FLUSH_TIMEOUT 1
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static signed short trame[2 * SAMPLES_PER_TRAME];
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static signed short pulse[2 * SAMPLES_PER_TRAME];
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static int ringpos = 0;
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static int pos, f1, f2;
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static int amplitude = 0;
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static int lp = 0;
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static void
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read_sample (void)
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{
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amplitude -= abs (trame[ringpos]);
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f1 -= pulse[ringpos];
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f1 += pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
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f2 -= pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
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fread (trame + ringpos, 1, sizeof (trame[0]), stdin);
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amplitude += abs (trame[ringpos]);
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if (pos ? (trame[ringpos] < -THRESHOLD)
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: (trame[ringpos] > +THRESHOLD))
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{
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pulse[ringpos] = 1;
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pos = !pos;
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f2++;
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}
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else
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pulse[ringpos] = 0;
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ringpos++;
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ringpos %= 2 * SAMPLES_PER_TRAME;
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lp++;
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}
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int
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main ()
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{
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int bitn = 7;
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char c = 0;
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int i;
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int llp = 0;
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while (!feof (stdin))
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{
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if (lp > 3 * SAMPLES_PER_TRAME)
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{
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bitn = 7;
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c = 0;
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lp = 0;
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llp++;
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}
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if (llp == FLUSH_TIMEOUT)
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fflush (stdout);
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if (f2 > FREQ_SEP_MIN && f2 < FREQ_SEP_MAX
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&& f1 > FREQ_DATA_MIN && f1 < FREQ_DATA_MAX)
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{
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#if DEBUG
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printf ("%d %d %d @%d\n", f1, f2, FREQ_DATA_THRESHOLD,
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ftell (stdin) - sizeof (trame));
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#endif
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if (f1 < FREQ_DATA_THRESHOLD)
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c |= (1 << bitn);
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bitn--;
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if (bitn < 0)
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{
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#if DEBUG
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printf ("<%c, %x>", c, c);
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#else
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printf ("%c", c);
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#endif
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bitn = 7;
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c = 0;
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}
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lp = 0;
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llp = 0;
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for (i = 0; i < SAMPLES_PER_TRAME; i++)
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read_sample ();
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continue;
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}
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read_sample ();
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}
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return 0;
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}
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