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121
COPYING
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121
COPYING
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@ -0,0 +1,121 @@
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|||||||
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Creative Commons Legal Code
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CC0 1.0 Universal
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CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
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LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
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ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
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INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
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PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
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THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
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HEREUNDER.
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Statement of Purpose
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The laws of most jurisdictions throughout the world automatically confer
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1. Copyright and Related Rights. A Work made available under CC0 may be
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2. Waiver. To the greatest extent permitted by, but not in contravention
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4. Limitations and Disclaimers.
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a. No trademark or patent rights held by Affirmer are waived, abandoned,
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41
Makefile
Normal file
41
Makefile
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|
|||||||
|
# arngment - random music generator
|
||||||
|
#
|
||||||
|
# Written in 2020 by Lucas
|
||||||
|
#
|
||||||
|
# To the extent possible under law, the author(s) have dedicated all
|
||||||
|
# copyright and related and neighboring rights to this software to the
|
||||||
|
# public domain worldwide. This software is distributed without any
|
||||||
|
# warranty.
|
||||||
|
#
|
||||||
|
# You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
# along with this software. If not, see
|
||||||
|
# <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
.POSIX:
|
||||||
|
.SUFFIXES:
|
||||||
|
.SUFFIXES: .c .o
|
||||||
|
|
||||||
|
P = arngment
|
||||||
|
V = 0.0
|
||||||
|
|
||||||
|
LDLIBS = -lm
|
||||||
|
|
||||||
|
HDR = err.h note.h synth.h
|
||||||
|
OBJ = err.o main.o note.o synth.o
|
||||||
|
SRC = ${OBJ:.o=.c}
|
||||||
|
DIST_FILES = COPYING Makefile ${HDR} ${SRC}
|
||||||
|
|
||||||
|
all: arngment
|
||||||
|
|
||||||
|
arngment: ${OBJ}
|
||||||
|
${CC} ${LDFLAGS} -o $@ ${OBJ} ${LDLIBS}
|
||||||
|
|
||||||
|
${OBJ}: ${HDR}
|
||||||
|
|
||||||
|
play: all
|
||||||
|
./arngment ${ARNGMENT_ARGS} | aucat -e s16 -h raw -i -
|
||||||
|
|
||||||
|
clean:
|
||||||
|
rm -f arngment ${OBJ} ${P}-${V}.tgz
|
||||||
|
|
||||||
|
dist: clean
|
||||||
|
pax -ws '@^@${P}-${V}/@' ${DIST_FILES} | gzip >${P}-${V}.tgz
|
||||||
86
err.c
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86
err.c
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|
|||||||
|
/*
|
||||||
|
* orcawm - XCB window manager
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <errno.h>
|
||||||
|
#include <stdarg.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
|
#include "err.h"
|
||||||
|
|
||||||
|
void
|
||||||
|
err(int eval, const char *fmt, ...)
|
||||||
|
{
|
||||||
|
va_list ap;
|
||||||
|
int saved_errno = errno;
|
||||||
|
|
||||||
|
fprintf(stderr, "%s: ", __progname);
|
||||||
|
if (fmt != NULL) {
|
||||||
|
va_start(ap, fmt);
|
||||||
|
vfprintf(stderr, fmt, ap);
|
||||||
|
va_end(ap);
|
||||||
|
fprintf(stderr, ": ");
|
||||||
|
}
|
||||||
|
fprintf(stderr, "%s\n", strerror(saved_errno));
|
||||||
|
|
||||||
|
exit(eval);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
errx(int eval, const char *fmt, ...)
|
||||||
|
{
|
||||||
|
va_list ap;
|
||||||
|
|
||||||
|
fprintf(stderr, "%s: ", __progname);
|
||||||
|
if (fmt != NULL) {
|
||||||
|
va_start(ap, fmt);
|
||||||
|
vfprintf(stderr, fmt, ap);
|
||||||
|
va_end(ap);
|
||||||
|
}
|
||||||
|
fprintf(stderr, "\n");
|
||||||
|
|
||||||
|
exit(eval);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
warn(const char *fmt, ...)
|
||||||
|
{
|
||||||
|
va_list ap;
|
||||||
|
int saved_errno = errno;
|
||||||
|
|
||||||
|
fprintf(stderr, "%s: ", __progname);
|
||||||
|
if (fmt != NULL) {
|
||||||
|
va_start(ap, fmt);
|
||||||
|
vfprintf(stderr, fmt, ap);
|
||||||
|
va_end(ap);
|
||||||
|
fprintf(stderr, ": ");
|
||||||
|
}
|
||||||
|
fprintf(stderr, "%s\n", strerror(saved_errno));
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
warnx(const char *fmt, ...)
|
||||||
|
{
|
||||||
|
va_list ap;
|
||||||
|
|
||||||
|
fprintf(stderr, "%s: ", __progname);
|
||||||
|
if (fmt != NULL) {
|
||||||
|
va_start(ap, fmt);
|
||||||
|
vfprintf(stderr, fmt, ap);
|
||||||
|
va_end(ap);
|
||||||
|
}
|
||||||
|
fprintf(stderr, "\n");
|
||||||
|
}
|
||||||
21
err.h
Normal file
21
err.h
Normal file
@ -0,0 +1,21 @@
|
|||||||
|
/*
|
||||||
|
* orcawm - XCB window manager
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
extern const char *__progname;
|
||||||
|
|
||||||
|
void err(int, const char *, ...);
|
||||||
|
void errx(int, const char *, ...);
|
||||||
|
void warn(const char *, ...);
|
||||||
|
void warnx(const char *, ...);
|
||||||
96
main.c
Normal file
96
main.c
Normal file
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|
|||||||
|
/*
|
||||||
|
* arngment - random music generator
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <limits.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
|
||||||
|
#include "err.h"
|
||||||
|
#include "note.h"
|
||||||
|
#include "synth.h"
|
||||||
|
|
||||||
|
#define nelems(_a) (sizeof(_a) / sizeof((_a)[0]))
|
||||||
|
|
||||||
|
#define GAIN 1.4
|
||||||
|
#define RATE 48000
|
||||||
|
|
||||||
|
static void
|
||||||
|
usage(void)
|
||||||
|
{
|
||||||
|
fprintf(stderr, "Usage: %s base_note\n", __progname);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
main(int argc, char *argv[])
|
||||||
|
{
|
||||||
|
int16_t buf[RATE];
|
||||||
|
int scale[] = {
|
||||||
|
0, 2, 3, 5, 7, 8, 10, 12,
|
||||||
|
0, 2, 3, 5, 7, 8, 10, 12,
|
||||||
|
12, 14, 15, 17, 19, 20, 22, 24,
|
||||||
|
};
|
||||||
|
struct note base_note, note;
|
||||||
|
double l, r, t;
|
||||||
|
size_t i;
|
||||||
|
uint32_t k;
|
||||||
|
int ch;
|
||||||
|
|
||||||
|
while ((ch = getopt(argc, argv, "")) != -1)
|
||||||
|
switch (ch) {
|
||||||
|
default:
|
||||||
|
usage();
|
||||||
|
}
|
||||||
|
argc -= optind;
|
||||||
|
argv += optind;
|
||||||
|
|
||||||
|
if (argc != 1)
|
||||||
|
usage();
|
||||||
|
if (!note_parse(&base_note, argv[0]))
|
||||||
|
errx(1, "Invalid note %s", argv[0]);
|
||||||
|
|
||||||
|
for (;;) {
|
||||||
|
k = arc4random_uniform(nelems(scale));
|
||||||
|
note = base_note;
|
||||||
|
note.offset += scale[k];
|
||||||
|
for (i = 0; i < RATE / 2; i += 2) {
|
||||||
|
t = i / (double)RATE;
|
||||||
|
l = synth_distortion(GAIN,
|
||||||
|
synth_sinewave(t, note_pitch(note)));
|
||||||
|
r = synth_distortion(GAIN,
|
||||||
|
synth_trianglewave(t, note_pitch(note)));
|
||||||
|
buf[i] = l * INT16_MAX;
|
||||||
|
buf[i + 1] = r * INT16_MAX;
|
||||||
|
}
|
||||||
|
|
||||||
|
k = arc4random_uniform(nelems(scale));
|
||||||
|
note = base_note;
|
||||||
|
note.offset += scale[k];
|
||||||
|
for (; i < RATE; i += 2) {
|
||||||
|
t = i / (double)RATE;
|
||||||
|
l = synth_distortion(GAIN,
|
||||||
|
synth_sinewave(t, note_pitch(note)));
|
||||||
|
r = synth_distortion(GAIN,
|
||||||
|
synth_trianglewave(t, note_pitch(note)));
|
||||||
|
buf[i] = l * INT16_MAX;
|
||||||
|
buf[i + 1] = r * INT16_MAX;
|
||||||
|
}
|
||||||
|
fwrite(buf, sizeof(buf[0]), RATE, stdout);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
65
note.c
Normal file
65
note.c
Normal file
@ -0,0 +1,65 @@
|
|||||||
|
/*
|
||||||
|
* arngment - random music generator
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <math.h>
|
||||||
|
|
||||||
|
#include "note.h"
|
||||||
|
|
||||||
|
static int
|
||||||
|
midi(struct note n)
|
||||||
|
{
|
||||||
|
/* C0 is MIDI note 12 */
|
||||||
|
return 12 * (n.octave + 1) + n.offset + n.accident;
|
||||||
|
}
|
||||||
|
|
||||||
|
double
|
||||||
|
note_pitch(struct note n)
|
||||||
|
{
|
||||||
|
int m = midi(n);
|
||||||
|
return 440.0 * pow(2.0, (m - 69) / 12.0);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
note_parse(struct note *note, const char *s)
|
||||||
|
{
|
||||||
|
/* Semitones from C, starting at A */
|
||||||
|
static int offsets[] = {9, 11, 0, 2, 4, 5, 7};
|
||||||
|
struct note n;
|
||||||
|
|
||||||
|
if (*s < 'A' || *s > 'G')
|
||||||
|
return 0;
|
||||||
|
n.offset = offsets[*s - 'A'];
|
||||||
|
s++;
|
||||||
|
|
||||||
|
if (*s == 'b') {
|
||||||
|
n.accident = ACCIDENT_FLAT;
|
||||||
|
s++;
|
||||||
|
} else if (*s == '#') {
|
||||||
|
n.accident = ACCIDENT_SHARP;
|
||||||
|
s++;
|
||||||
|
} else
|
||||||
|
n.accident = ACCIDENT_NATURAL;
|
||||||
|
|
||||||
|
if (*s < '0' || *s > '9')
|
||||||
|
return 0;
|
||||||
|
n.octave = *s - '0';
|
||||||
|
s++;
|
||||||
|
|
||||||
|
if (*s != '\0')
|
||||||
|
return 0;
|
||||||
|
*note = n;
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
27
note.h
Normal file
27
note.h
Normal file
@ -0,0 +1,27 @@
|
|||||||
|
/*
|
||||||
|
* arngment - random music generator
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
struct note {
|
||||||
|
int offset;
|
||||||
|
enum {
|
||||||
|
ACCIDENT_FLAT = -1,
|
||||||
|
ACCIDENT_NATURAL,
|
||||||
|
ACCIDENT_SHARP,
|
||||||
|
} accident;
|
||||||
|
int octave;
|
||||||
|
};
|
||||||
|
|
||||||
|
double note_pitch(struct note);
|
||||||
|
int note_parse(struct note *, const char *);
|
||||||
38
synth.c
Normal file
38
synth.c
Normal file
@ -0,0 +1,38 @@
|
|||||||
|
/*
|
||||||
|
* arngment - random music generator
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <math.h>
|
||||||
|
|
||||||
|
#define CLAMP(x, a, b) ((x) < (a) ? (a) : (x) > (b) ? (b) : (x))
|
||||||
|
|
||||||
|
double
|
||||||
|
synth_distortion(double gain, double x)
|
||||||
|
{
|
||||||
|
double xg = CLAMP(x * gain, -1.0, 1.0);
|
||||||
|
return (x + xg) / 2.0;
|
||||||
|
}
|
||||||
|
|
||||||
|
double
|
||||||
|
synth_sinewave(double t, double a)
|
||||||
|
{
|
||||||
|
return sin(2.0 * M_PI * t * a);
|
||||||
|
}
|
||||||
|
|
||||||
|
double
|
||||||
|
synth_trianglewave(double t, double a)
|
||||||
|
{
|
||||||
|
double x = t * a;
|
||||||
|
return 2.0 * fabs(2.0 * (x - floor(0.5 + x))) - 1.0;
|
||||||
|
}
|
||||||
18
synth.h
Normal file
18
synth.h
Normal file
@ -0,0 +1,18 @@
|
|||||||
|
/*
|
||||||
|
* arngment - random music generator
|
||||||
|
*
|
||||||
|
* Written in 2020 by Lucas
|
||||||
|
*
|
||||||
|
* To the extent possible under law, the author(s) have dedicated all
|
||||||
|
* copyright and related and neighboring rights to this software to the
|
||||||
|
* public domain worldwide. This software is distributed without any
|
||||||
|
* warranty.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the CC0 Public Domain Dedication
|
||||||
|
* along with this software. If not, see
|
||||||
|
* <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
double synth_distortion(double, double);
|
||||||
|
double synth_sinewave(double, double);
|
||||||
|
double synth_trianglewave(double, double);
|
||||||
Loading…
Reference in New Issue
Block a user