From a722a9eef828781ee0c924db787815f19c037d4f Mon Sep 17 00:00:00 2001 From: Lucas Date: Tue, 12 May 2020 23:54:27 +0000 Subject: [PATCH] initial commit --- COPYING | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 41 +++++++++++++++++++ err.c | 86 +++++++++++++++++++++++++++++++++++++++ err.h | 21 ++++++++++ main.c | 96 +++++++++++++++++++++++++++++++++++++++++++ note.c | 65 ++++++++++++++++++++++++++++++ note.h | 27 +++++++++++++ synth.c | 38 +++++++++++++++++ synth.h | 18 +++++++++ 9 files changed, 513 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 err.c create mode 100644 err.h create mode 100644 main.c create mode 100644 note.c create mode 100644 note.h create mode 100644 synth.c create mode 100644 synth.h 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. 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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);