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bpm-tools
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This commit is contained in:
Mark Hills 2011-12-06 15:40:21 +00:00
parent 9d7dcb001c
commit e3cfa32fc8
1 changed files with 46 additions and 19 deletions
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65
bpm.c
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@ -25,8 +25,8 @@
#include <sysexits.h>
#include <unistd.h>
#define BANNER "tempo 0.1 (C) Copyright 2011 Mark Hills <mark@pogo.org.uk>"
#define NAME "tempo"
#define BANNER "bpm 0.1 (C) Copyright 2011 Mark Hills <mark@pogo.org.uk>"
#define NAME "bpm"
#define RATE 44100 /* of input data */
@ -122,7 +122,7 @@ double scan_for_bpm(float nrg[], size_t len,
double slowest, double fastest,
unsigned int steps,
unsigned int samples,
bool graph)
FILE *file)
{
double step, interval, trough, height;
unsigned int s;
@ -140,8 +140,8 @@ 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",
if (file != NULL) {
fprintf(file, "%lf\t%lf\n",
interval_to_bpm(interval),
t / samples);
}
@ -161,17 +161,18 @@ void usage(FILE *f)
{
fprintf(f, "Usage: " NAME " [options]\n"
"Analyse the tempo (in beats-per-minute, BPM) of incoming audio\n\n"
" -g Output autodifference graph to stdout\n"
" -f Print format for final BPM value (default \"%%0.1f\")\n"
" -v Print progress information to stderr\n"
" -h Display this help message and exit\n\n");
" -g <path> Output autodifference data to file\n"
" -e <path> Output energy data to file\n"
" -f Print format for final BPM value (default \"%%0.1f\")\n"
" -v Print progress information to stderr\n"
" -h Display this help message and exit\n\n");
fprintf(f, "Incoming audio is raw audio on stdin at %dHz, mono, 32-bit float; eg.\n"
" $ sox file.mp3 -t raw -r %d -e float -c 1 | ./" NAME "\n\n",
" $ sox file.mp3 -t raw -r %d -e float -c 1 - | ./" NAME "\n\n",
RATE, RATE);
fprintf(f, "To view autodifference graph:\n"
" $ sox [...] | ./tempo -g > file.dat\n"
fprintf(f, "To view autodifference or energy data:\n"
" $ sox [...] | ./tempo -g file.dat\n"
" $ gnuplot\n"
" gnuplot> plot \"file.dat\"\n\n");
}
@ -183,11 +184,12 @@ int main(int argc, char *argv[])
off_t n = 0;
float bpm, v = 0.0;
const char *format = "%0.1f";
FILE *fdiff = NULL, *fnrg = NULL;
for (;;) {
int c;
c = getopt(argc, argv, "vf:gh");
c = getopt(argc, argv, "vf:g:e:h");
if (c == -1)
break;
@ -197,7 +199,19 @@ int main(int argc, char *argv[])
break;
case 'g':
format = NULL;
fdiff = fopen(optarg, "w");
if (fdiff == NULL) {
perror(optarg);
return -1;
}
break;
case 'e':
fnrg = fopen(optarg, "w");
if (fnrg == NULL) {
perror(optarg);
return -1;
}
break;
case 'h':
@ -253,17 +267,30 @@ int main(int argc, char *argv[])
buf = n;
}
if (fnrg != NULL) {
fprintf(fnrg, "%lf\t%lf\n",
(double)len * INTERVAL / RATE, v);
}
nrg[len++] = v;
}
bpm = scan_for_bpm(nrg, len, 60.0, 170.0, 800, 1000, (format == NULL));
bpm = scan_for_bpm(nrg, len, 72.0, 168.0, 1200, 1200, fdiff);
if (format != NULL) {
printf(format, bpm);
putc('\n', stdout);
}
printf(format, bpm);
putc('\n', stdout);
free(nrg);
if (fdiff != NULL) {
if (fclose(fdiff) != 0)
perror("fclose");
}
if (fnrg != NULL) {
if (fclose(fnrg) != 0)
perror("fclose");
}
return 0;
}