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bpm-tools
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This commit is contained in:
Mark Hills 2011-12-05 23:05:53 +00:00
parent e232f223da
commit 7f1cb8bd33
1 changed files with 27 additions and 21 deletions
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48
tempo.c
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@ -1,3 +1,22 @@
/*
* Copyright (C) 2011 Mark Hills <mark@pogo.org.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2, as published by the Free Software Foundation.
*
* 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 version 2 for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <assert.h>
#include <math.h>
#include <stdbool.h>
@ -45,7 +64,7 @@ double autodifference(float nrg[], size_t len, double interval)
size_t n;
double mid, v, diff;
static const double beats[] = { -32, -16, -8, -4, -2, -1, 1, 2, 4, 8, 16, 32 },
nobeats[] = { -0.5, -0.25, 0.25, 0.5 };
nobeats[] = { -0.5, -0.5, 0.5, 0.5 };
mid = drand() * len;
v = sample(nrg, len, mid);
@ -65,7 +84,7 @@ double autodifference(float nrg[], size_t len, double interval)
diff -= fabs(y - v);
}
return diff;
return diff / (ARRAY_SIZE(beats) + ARRAY_SIZE(nobeats));
}
/*
@ -121,8 +140,11 @@ double scan_for_bpm(float nrg[], size_t len,
for (s = 0; s < samples; s++)
t += autodifference(nrg, len, interval);
if (graph)
printf("%lf\t%lf\n", interval_to_bpm(interval), t);
if (graph) {
printf("%lf\t%lf\n",
interval_to_bpm(interval),
t / samples);
}
/* Track the lowest value */
@ -161,7 +183,6 @@ int main(int argc, char *argv[])
off_t n = 0;
float bpm, v = 0.0;
const char *format = "%0.1f";
bool verbose = false;
for (;;) {
int c;
@ -171,10 +192,6 @@ int main(int argc, char *argv[])
break;
switch (c) {
case 'v':
verbose = true;
break;
case 'f':
format = optarg;
break;
@ -200,11 +217,6 @@ int main(int argc, char *argv[])
return EX_USAGE;
}
if (verbose) {
fputs(BANNER "\n", stderr);
fprintf(stderr, "Metering incoming audio\n");
}
for (;;) {
float z;
@ -244,10 +256,7 @@ int main(int argc, char *argv[])
nrg[len++] = v;
}
if (verbose)
fprintf(stderr, "Sampling tempo range\n");
bpm = scan_for_bpm(nrg, len, 60.0, 180.0, 400, 1000, (format == NULL));
bpm = scan_for_bpm(nrg, len, 60.0, 170.0, 800, 1000, (format == NULL));
if (format != NULL) {
printf(format, bpm);
@ -256,8 +265,5 @@ int main(int argc, char *argv[])
free(nrg);
if (verbose)
fprintf(stderr, "Done\n");
return 0;
}