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usr.sbin/virtual_oss/virtual_equalizer/equalizer.c

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/*-
* Copyright (c) 2019 Google LLC, written by Richard Kralovic <riso@google.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/soundcard.h>
#include <sys/types.h>
#include <sys/un.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fftw3.h>
#include <getopt.h>
#include <math.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "virtual_oss.h"
struct Equalizer {
double rate;
int block_size;
int do_normalize;
/* (block_size * 2) elements, time domain */
double *fftw_time;
/* (block_size * 2) elements, half-complex, freq domain */
double *fftw_freq;
fftw_plan forward;
fftw_plan inverse;
};
static int be_silent = 0;
static void
message(const char *fmt,...)
{
va_list list;
if (be_silent)
return;
va_start(list, fmt);
vfprintf(stderr, fmt, list);
va_end(list);
}
/*
* Masking window value for -1 < x < 1.
*
* Window must be symmetric, thus, this function is queried for x >= 0
* only. Currently a Hann window.
*/
static double
equalizer_get_window(double x)
{
return (0.5 + 0.5 * cos(M_PI * x));
}
static int
equalizer_load_freq_amps(struct Equalizer *e, const char *config)
{
double prev_f = 0.0;
double prev_amp = 1.0;
double next_f = 0.0;
double next_amp = 1.0;
int i;
if (strncasecmp(config, "normalize", 4) == 0) {
while (*config != 0) {
if (*config == '\n') {
config++;
break;
}
config++;
}
e->do_normalize = 1;
} else {
e->do_normalize = 0;
}
for (i = 0; i <= (e->block_size / 2); ++i) {
const double f = (i * e->rate) / e->block_size;
while (f >= next_f) {
prev_f = next_f;
prev_amp = next_amp;
if (*config == 0) {
next_f = e->rate;
next_amp = prev_amp;
} else {
int len;
if (sscanf(config, "%lf %lf %n", &next_f, &next_amp, &len) == 2) {
config += len;
if (next_f < prev_f) {
message("Parse error: Nonincreasing sequence of frequencies.\n");
return (0);
}
} else {
message("Parse error.\n");
return (0);
}
}
if (prev_f == 0.0)
prev_amp = next_amp;
}
e->fftw_freq[i] = ((f - prev_f) / (next_f - prev_f)) * (next_amp - prev_amp) + prev_amp;
}
return (1);
}
static void
equalizer_init(struct Equalizer *e, int rate, int block_size)
{
size_t buffer_size;
e->rate = rate;
e->block_size = block_size;
buffer_size = sizeof(double) * e->block_size;
e->fftw_time = (double *)malloc(buffer_size);
e->fftw_freq = (double *)malloc(buffer_size);
e->forward = fftw_plan_r2r_1d(block_size, e->fftw_time, e->fftw_freq,
FFTW_R2HC, FFTW_MEASURE);
e->inverse = fftw_plan_r2r_1d(block_size, e->fftw_freq, e->fftw_time,
FFTW_HC2R, FFTW_MEASURE);
}
static int
equalizer_load(struct Equalizer *eq, const char *config)
{
int retval = 0;
int N = eq->block_size;
int buffer_size = sizeof(double) * N;
int i;
memset(eq->fftw_freq, 0, buffer_size);
message("\n\nReloading amplification specifications:\n%s\n", config);
if (!equalizer_load_freq_amps(eq, config))
goto end;
double *requested_freq = (double *)malloc(buffer_size);
memcpy(requested_freq, eq->fftw_freq, buffer_size);
fftw_execute(eq->inverse);
/* Multiply by symmetric window and shift */
for (i = 0; i < (N / 2); ++i) {
double weight = equalizer_get_window(i / (double)(N / 2)) / N;
eq->fftw_time[N / 2 + i] = eq->fftw_time[i] * weight;
}
for (i = (N / 2 - 1); i > 0; --i) {
eq->fftw_time[i] = eq->fftw_time[N - i];
}
eq->fftw_time[0] = 0;
fftw_execute(eq->forward);
for (i = 0; i < N; ++i) {
eq->fftw_freq[i] /= (double)N;
}
/* Debug output */
for (i = 0; i <= (N / 2); ++i) {
double f = (eq->rate / N) * i;
double a = sqrt(pow(eq->fftw_freq[i], 2.0) +
((i > 0 && i < N / 2) ? pow(eq->fftw_freq[N - i], 2.0) : 0));
a *= N;
double r = requested_freq[i];
message("%3.1lf Hz: requested %2.2lf, got %2.7lf (log10 = %.2lf), %3.7lfdb\n",
f, r, a, log(a) / log(10), (log(a / r) / log(10.0)) * 10.0);
}
/* Normalize FIR filter, if any */
if (eq->do_normalize) {
double sum = 0;
for (i = 0; i < N; ++i)
sum += fabs(eq->fftw_time[i]);
if (sum != 0.0) {
for (i = 0; i < N; ++i)
eq->fftw_time[i] /= sum;
}
}
for (i = 0; i < N; ++i) {
message("%.3lf ms: %.10lf\n", 1000.0 * i / eq->rate, eq->fftw_time[i]);
}
/* End of debug */
retval = 1;
free(requested_freq);
end:
return (retval);
}
static void
equalizer_done(struct Equalizer *eq)
{
fftw_destroy_plan(eq->forward);
fftw_destroy_plan(eq->inverse);
free(eq->fftw_time);
free(eq->fftw_freq);
}
static struct option equalizer_opts[] = {
{"device", required_argument, NULL, 'd'},
{"part", required_argument, NULL, 'p'},
{"channels", required_argument, NULL, 'c'},
{"what", required_argument, NULL, 'w'},
{"off", no_argument, NULL, 'o'},
{"quiet", no_argument, NULL, 'q'},
{"file", no_argument, NULL, 'f'},
{"help", no_argument, NULL, 'h'},
};
static void
usage(void)
{
message("Usage: virtual_equalizer -d /dev/vdsp.ctl \n"
"\t -d, --device [control device]\n"
"\t -w, --what [rx_dev,tx_dev,rx_loop,tx_loop, default tx_dev]\n"
"\t -p, --part [part number, default 0]\n"
"\t -c, --channels [channels, default -1]\n"
"\t -f, --file [read input from file, default standard input]\n"
"\t -o, --off [disable equalizer]\n"
"\t -q, --quiet\n"
"\t -h, --help\n");
exit(EX_USAGE);
}
int
main(int argc, char **argv)
{
struct virtual_oss_fir_filter fir = {};
struct virtual_oss_io_info info = {};
struct Equalizer e;
char buffer[65536];
unsigned cmd_fir_set = VIRTUAL_OSS_SET_TX_DEV_FIR_FILTER;
unsigned cmd_fir_get = VIRTUAL_OSS_GET_TX_DEV_FIR_FILTER;
unsigned cmd_info = VIRTUAL_OSS_GET_DEV_INFO;
const char *dsp = NULL;
int rate;
int channels = -1;
int part = 0;
int opt;
int len;
int offset;
int disable = 0;
int f = STDIN_FILENO;
while ((opt = getopt_long(argc, argv, "d:c:f:op:w:qh",
equalizer_opts, NULL)) != -1) {
switch (opt) {
case 'd':
dsp = optarg;
break;
case 'c':
channels = atoi(optarg);
if (channels == 0) {
message("Wrong number of channels\n");
usage();
}
break;
case 'p':
part = atoi(optarg);
if (part < 0) {
message("Invalid part number\n");
usage();
}
break;
case 'w':
if (strcmp(optarg, "rx_dev") == 0) {
cmd_fir_set = VIRTUAL_OSS_SET_RX_DEV_FIR_FILTER;
cmd_fir_get = VIRTUAL_OSS_GET_RX_DEV_FIR_FILTER;
cmd_info = VIRTUAL_OSS_GET_DEV_INFO;
} else if (strcmp(optarg, "tx_dev") == 0) {
cmd_fir_set = VIRTUAL_OSS_SET_TX_DEV_FIR_FILTER;
cmd_fir_get = VIRTUAL_OSS_GET_TX_DEV_FIR_FILTER;
cmd_info = VIRTUAL_OSS_GET_DEV_INFO;
} else if (strcmp(optarg, "rx_loop") == 0) {
cmd_fir_set = VIRTUAL_OSS_SET_RX_LOOP_FIR_FILTER;
cmd_fir_get = VIRTUAL_OSS_GET_RX_LOOP_FIR_FILTER;
cmd_info = VIRTUAL_OSS_GET_LOOP_INFO;
} else if (strcmp(optarg, "tx_loop") == 0) {
cmd_fir_set = VIRTUAL_OSS_SET_TX_LOOP_FIR_FILTER;
cmd_fir_get = VIRTUAL_OSS_GET_TX_LOOP_FIR_FILTER;
cmd_info = VIRTUAL_OSS_GET_LOOP_INFO;
} else {
message("Bad -w argument not recognized\n");
usage();
}
break;
case 'f':
if (f != STDIN_FILENO) {
message("Can only specify one file\n");
usage();
}
f = open(optarg, O_RDONLY);
if (f < 0) {
message("Cannot open specified file\n");
usage();
}
break;
case 'o':
disable = 1;
break;
case 'q':
be_silent = 1;
break;
default:
usage();
}
}
fir.number = part;
info.number = part;
int fd = open(dsp, O_RDWR);
if (fd < 0) {
message("Cannot open DSP device\n");
return (EX_SOFTWARE);
}
if (ioctl(fd, VIRTUAL_OSS_GET_SAMPLE_RATE, &rate) < 0) {
message("Cannot get sample rate\n");
return (EX_SOFTWARE);
}
if (ioctl(fd, cmd_fir_get, &fir) < 0) {
message("Cannot get current FIR filter\n");
return (EX_SOFTWARE);
}
if (disable) {
for (fir.channel = 0; fir.channel != channels; fir.channel++) {
if (ioctl(fd, cmd_fir_set, &fir) < 0) {
if (fir.channel == 0) {
message("Cannot disable FIR filter\n");
return (EX_SOFTWARE);
}
break;
}
}
return (0);
}
equalizer_init(&e, rate, fir.filter_size);
equalizer_load(&e, "");
if (f == STDIN_FILENO) {
if (ioctl(fd, cmd_info, &info) < 0) {
message("Cannot read part information\n");
return (EX_SOFTWARE);
}
message("Please enter EQ layout for %s, <freq> <gain>:\n", info.name);
}
offset = 0;
while (1) {
if (offset == (int)(sizeof(buffer) - 1)) {
message("Too much input data\n");
return (EX_SOFTWARE);
}
len = read(f, buffer + offset, sizeof(buffer) - 1 - offset);
if (len <= 0)
break;
offset += len;
}
buffer[offset] = 0;
close(f);
if (f == STDIN_FILENO)
message("Loading new EQ layout\n");
if (equalizer_load(&e, buffer) == 0) {
message("Invalid equalizer data\n");
return (EX_SOFTWARE);
}
fir.filter_data = e.fftw_time;
for (fir.channel = 0; fir.channel != channels; fir.channel++) {
if (ioctl(fd, cmd_fir_set, &fir) < 0) {
if (fir.channel == 0)
message("Cannot set FIR filter on channel\n");
break;
}
}
close(fd);
equalizer_done(&e);
return (0);
}