commit a722a9eef828781ee0c924db787815f19c037d4f Author: Lucas Date: Tue May 12 23:54:27 2020 +0000 initial commit diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..0e259d4 --- /dev/null +++ b/COPYING @@ -0,0 +1,121 @@ +Creative Commons Legal Code + +CC0 1.0 Universal + + CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE + LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN + ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS + INFORMATION ON AN "AS-IS" BASIS. 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Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to + this CC0 or use of the Work. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e89dbdd --- /dev/null +++ b/Makefile @@ -0,0 +1,41 @@ +# 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 +# . +.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 diff --git a/err.c b/err.c new file mode 100644 index 0000000..7c30544 --- /dev/null +++ b/err.c @@ -0,0 +1,86 @@ +/* + * 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 + * . + */ + +#include +#include +#include +#include +#include + +#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"); +} diff --git a/err.h b/err.h new file mode 100644 index 0000000..7b0dcda --- /dev/null +++ b/err.h @@ -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 + * . + */ + +extern const char *__progname; + +void err(int, const char *, ...); +void errx(int, const char *, ...); +void warn(const char *, ...); +void warnx(const char *, ...); diff --git a/main.c b/main.c new file mode 100644 index 0000000..91c0862 --- /dev/null +++ b/main.c @@ -0,0 +1,96 @@ +/* + * 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 + * . + */ + +#include +#include +#include +#include +#include + +#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; +} diff --git a/note.c b/note.c new file mode 100644 index 0000000..97e6f0d --- /dev/null +++ b/note.c @@ -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 + * . + */ + +#include + +#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; +} diff --git a/note.h b/note.h new file mode 100644 index 0000000..d2f690f --- /dev/null +++ b/note.h @@ -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 + * . + */ + +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 *); diff --git a/synth.c b/synth.c new file mode 100644 index 0000000..e8f21fa --- /dev/null +++ b/synth.c @@ -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 + * . + */ + +#include + +#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; +} diff --git a/synth.h b/synth.h new file mode 100644 index 0000000..1fbf2f2 --- /dev/null +++ b/synth.h @@ -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 + * . + */ + +double synth_distortion(double, double); +double synth_sinewave(double, double); +double synth_trianglewave(double, double);