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-rw-r--r--util/spkmodem_recv/.gitignore1
-rw-r--r--util/spkmodem_recv/Makefile30
-rw-r--r--util/spkmodem_recv/spkmodem-recv.c313
3 files changed, 0 insertions, 344 deletions
diff --git a/util/spkmodem_recv/.gitignore b/util/spkmodem_recv/.gitignore
deleted file mode 100644
index 2f5c946c..00000000
--- a/util/spkmodem_recv/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-spkmodem-recv
diff --git a/util/spkmodem_recv/Makefile b/util/spkmodem_recv/Makefile
deleted file mode 100644
index 293d7475..00000000
--- a/util/spkmodem_recv/Makefile
+++ /dev/null
@@ -1,30 +0,0 @@
-# SPDX-License-Identifier: MIT
-# SPDX-FileCopyrightText: 2022,2026 Leah Rowe <leah@libreboot.org>
-# SPDX-FileCopyrightText: 2023 Riku Viitanen <riku.viitanen@protonmail.com>
-
-CC?=cc
-CFLAGS?=-Os -Wall -Wextra -Werror -pedantic -std=c90
-DESTDIR?=
-PREFIX?=/usr/local
-INSTALL?=install
-
-PROG=spkmodem-recv
-
-all: $(PROG)
-
-$(PROG): spkmodem-recv.c
- $(CC) $(CFLAGS) spkmodem-recv.c -o $(PROG)
-
-install: $(PROG)
- mkdir -p $(DESTDIR)$(PREFIX)/bin/
- install -c $(PROG) $(DESTDIR)$(PREFIX)/bin/
-
-uninstall:
- rm -f $(DESTDIR)$(PREFIX)/bin/$(PROG)
-
-clean:
- rm -f $(PROG)
-
-distclean: clean
-
-.PHONY: all install uninstall clean distclean
diff --git a/util/spkmodem_recv/spkmodem-recv.c b/util/spkmodem_recv/spkmodem-recv.c
deleted file mode 100644
index d448c84b..00000000
--- a/util/spkmodem_recv/spkmodem-recv.c
+++ /dev/null
@@ -1,313 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* SPDX-FileCopyrightText: 2013 Free Software Foundation, Inc. */
-/* Usage: parec --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */
-
-/* Forked from coreboot's version, at util/spkmodem_recv/ in coreboot.git,
- * revision 5c2b5fcf2f9c9259938fd03cfa3ea06b36a007f0 as of 3 January 2022.
- * This version is heavily modified, re-written based on OpenBSD Kernel Source
- * File Style Guide (KNF); this change is Copyright 2023,2026 Leah Rowe. */
-
-#define _POSIX_SOURCE
-
-/*
- * For OpenBSD define, to detect version
- * for deciding whether to use pledge(2)
- */
-#ifdef __OpenBSD__
-#include <sys/param.h>
-#endif
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#define SAMPLES_PER_FRAME 240
-#define MAX_SAMPLES (2 * SAMPLES_PER_FRAME)
-
-#define FREQ_SEP_MIN 5
-#define FREQ_SEP_MAX 15
-
-#define FREQ_DATA_MIN 15
-#define FREQ_DATA_THRESHOLD 25
-#define FREQ_DATA_MAX 60
-
-#define THRESHOLD 500
-
-#define READ_BUF 4096
-
-struct decoder_state {
- signed short frame[MAX_SAMPLES];
- unsigned char pulse[MAX_SAMPLES];
-
- signed short inbuf[READ_BUF];
- size_t inpos;
- size_t inlen;
-
- int ringpos;
- int sep_pos;
-
- /*
- * Sliding window pulse counters
- * used to detect modem tones
- */
- int freq_data;
- int freq_separator;
- int sample_count;
-
- int ascii_bit;
- unsigned char ascii;
-
- int debug;
-};
-
-static const char *argv0;
-
-static void handle_audio(struct decoder_state *st);
-static int valid_signal(struct decoder_state *st);
-static void decode_pulse(struct decoder_state *st);
-static signed short read_sample(struct decoder_state *st);
-static int set_ascii_bit(struct decoder_state *st);
-static void print_char(struct decoder_state *st);
-static void print_stats(struct decoder_state *st);
-static void reset_char(struct decoder_state *st);
-
-static void err(int errval, const char *msg, ...);
-static void usage(void);
-static const char *progname(void);
-
-int getopt(int, char * const *, const char *);
-extern char *optarg;
-extern int optind;
-extern int opterr;
-extern int optopt;
-
-#ifndef errno
-extern int errno;
-#endif
-
-int
-main(int argc, char **argv)
-{
- struct decoder_state st;
- int c;
-
-#if defined (__OpenBSD__) && defined(OpenBSD)
-#if OpenBSD >= 509
- if (pledge("stdio", NULL) == -1)
- err(errno, "pledge");
-#endif
-#endif
-
- memset(&st, 0, sizeof(st));
- st.ascii_bit = 7;
-
- st.ringpos = 0;
- st.sep_pos = SAMPLES_PER_FRAME;
-
- argv0 = argv[0];
-
- while ((c = getopt(argc, argv, "d")) != -1) {
- switch (c) {
- case 'd':
- st.debug = 1;
- break;
- default:
- usage();
- }
- }
-
- setvbuf(stdout, NULL, _IONBF, 0);
-
- for (;;)
- handle_audio(&st);
-
- return EXIT_SUCCESS;
-}
-
-static void
-handle_audio(struct decoder_state *st)
-{
- int sample;
-
- if (st->sample_count > (3 * SAMPLES_PER_FRAME))
- reset_char(st);
-
- if (valid_signal(st)) {
-
- if (set_ascii_bit(st) < 0)
- print_char(st);
-
- st->sample_count = 0;
-
- for (sample = 0; sample < SAMPLES_PER_FRAME; sample++)
- decode_pulse(st);
-
- } else {
- decode_pulse(st);
- }
-}
-
-static int
-valid_signal(struct decoder_state *st)
-{
- return (st->freq_separator > FREQ_SEP_MIN &&
- st->freq_separator < FREQ_SEP_MAX &&
- st->freq_data > FREQ_DATA_MIN &&
- st->freq_data < FREQ_DATA_MAX);
-}
-
-static void
-decode_pulse(struct decoder_state *st)
-{
- unsigned char old_ring, old_sep;
- unsigned char new_pulse;
-
- old_ring = st->pulse[st->ringpos];
- old_sep = st->pulse[st->sep_pos];
-
- st->freq_data -= old_ring;
- st->freq_data += old_sep;
- st->freq_separator -= old_sep;
-
- st->frame[st->ringpos] = read_sample(st);
-
- if (st->frame[st->ringpos] > THRESHOLD ||
- st->frame[st->ringpos] < -THRESHOLD)
- new_pulse = 1;
- else
- new_pulse = 0;
-
- st->pulse[st->ringpos] = new_pulse;
- st->freq_separator += new_pulse;
-
- st->ringpos++;
- if (st->ringpos >= MAX_SAMPLES)
- st->ringpos = 0;
-
- st->sep_pos++;
- if (st->sep_pos >= MAX_SAMPLES)
- st->sep_pos = 0;
-
- st->sample_count++;
-}
-
-static signed short
-read_sample(struct decoder_state *st)
-{
- size_t n;
-
- while (st->inpos >= st->inlen) {
-
- n = fread(st->inbuf, sizeof(st->inbuf[0]),
- READ_BUF, stdin);
-
- if (n == 0) {
- if (feof(stdin))
- exit(EXIT_SUCCESS);
- err(errno, "stdin read");
- }
-
- st->inpos = 0;
- st->inlen = n;
- }
-
- return st->inbuf[st->inpos++];
-}
-
-static int
-set_ascii_bit(struct decoder_state *st)
-{
- if (st->debug)
- print_stats(st);
-
- if (st->freq_data < FREQ_DATA_THRESHOLD)
- st->ascii |= (1 << st->ascii_bit);
-
- st->ascii_bit--;
-
- return st->ascii_bit;
-}
-
-static void
-print_char(struct decoder_state *st)
-{
- if (st->debug)
- printf("<%c,%x>", st->ascii, st->ascii);
- else
- putchar(st->ascii);
-
- reset_char(st);
-}
-
-static void
-print_stats(struct decoder_state *st)
-{
- long pos;
-
- pos = ftell(stdin);
-
- if (pos == -1) {
- printf("%d %d %d\n",
- st->freq_data,
- st->freq_separator,
- FREQ_DATA_THRESHOLD);
- return;
- }
-
- printf("%d %d %d @%ld\n",
- st->freq_data,
- st->freq_separator,
- FREQ_DATA_THRESHOLD,
- pos - sizeof(st->frame));
-}
-
-static void
-reset_char(struct decoder_state *st)
-{
- st->ascii = 0;
- st->ascii_bit = 7;
-}
-
-static void
-err(int errval, const char *msg, ...)
-{
- va_list ap;
-
- fprintf(stderr, "%s: ", progname());
-
- va_start(ap, msg);
- vfprintf(stderr, msg, ap);
- va_end(ap);
-
- if (!errno)
- errno = errval;
-
- fprintf(stderr, ": %s\n", strerror(errno));
- exit(EXIT_FAILURE);
-}
-
-static void
-usage(void)
-{
- fprintf(stderr, "usage: %s [-d]\n", progname());
- exit(EXIT_FAILURE);
-}
-
-static const char *
-progname(void)
-{
- const char *p;
-
- if (argv0 == NULL || *argv0 == '\0')
- return "";
-
- p = strrchr(argv0, '/');
-
- if (p)
- return p + 1;
- else
- return argv0;
-}
generated by cgit v1.2.1 (git 2.18.0) at 2026-03-12 23:39:41 +0000