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fmlib.c
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/* fmlib.c - simple V4L2 compatible tuner for radio cards
Copyright (C) 2009, 2012 Ben Pfaff <blp@cs.stanford.edu>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fmlib.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
struct tuner_test {
int freq; /* In 1/16 MHz. */
int volume; /* Between 1000 and 2000. */
bool mute; /* Muted? */
};
char *program_name;
static void query_control(const struct tuner *, uint32_t id,
struct v4l2_queryctrl *);
static int32_t get_control(const struct tuner *, uint32_t id);
static void set_control(const struct tuner *, uint32_t id, int32_t value);
static void query_tuner(const struct tuner *, struct v4l2_tuner *);
void
fatal(int error, const char *msg, ...)
{
va_list args;
fprintf(stderr, "%s: ", program_name);
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
if (error)
fprintf(stderr, ": %s", strerror(error));
putc('\n', stderr);
exit(EXIT_FAILURE);
}
static void *
xmalloc(size_t n)
{
void *p = malloc(n ? n : 1);
if (!p)
fatal(0, "out of memory");
return p;
}
void
tuner_open(struct tuner *tuner, const char *device, int index)
{
memset(tuner, 0, sizeof *tuner);
if (!device)
device = "/dev/radio0";
else if (!strcmp(device, "test") || !strncmp(device, "test ", 5)) {
double volume;
int mute;
int n;
n = sscanf(device, "test %lf %d", &volume, &mute);
if (n < 1)
volume = 50;
if (n < 2)
mute = 0;
tuner->test = xmalloc(sizeof *tuner->test);
tuner->test->freq = 90 * 16;
tuner->test->volume = volume >= 0 ? volume * 10 + 1000.5 : 0;
tuner->test->mute = mute != 0;
device = "/dev/null";
}
tuner->fd = open(device, O_RDONLY);
if (tuner->fd < 0)
fatal(errno, "Unable to open %s", device);
tuner->index = index;
query_control(tuner, V4L2_CID_AUDIO_VOLUME, &tuner->volume_ctrl);
query_tuner(tuner, &tuner->tuner);
}
void
tuner_close(struct tuner *tuner)
{
close(tuner->fd);
}
bool
tuner_is_muted(const struct tuner *tuner)
{
return get_control(tuner, V4L2_CID_AUDIO_MUTE);
}
void
tuner_set_mute(struct tuner *tuner, bool mute)
{
set_control(tuner, V4L2_CID_AUDIO_MUTE, mute);
}
bool
tuner_has_volume_control(const struct tuner *tuner)
{
const struct v4l2_queryctrl *vqc = &tuner->volume_ctrl;
return vqc->maximum > vqc->minimum;
}
double
tuner_get_volume(const struct tuner *tuner)
{
if (tuner_has_volume_control(tuner)) {
const struct v4l2_queryctrl *vqc = &tuner->volume_ctrl;
int volume = get_control(tuner, V4L2_CID_AUDIO_VOLUME);
return (100.0
* (volume - vqc->minimum)
/ (vqc->maximum - vqc->minimum));
} else {
return 100.0;
}
}
void
tuner_set_volume(struct tuner *tuner, double volume)
{
if (tuner_has_volume_control(tuner)) {
struct v4l2_queryctrl *vqc = &tuner->volume_ctrl;
set_control(tuner, V4L2_CID_AUDIO_VOLUME,
(volume / 100.0 * (vqc->maximum - vqc->minimum)
+ vqc->minimum));
}
}
long long int
tuner_get_min_freq(const struct tuner *tuner)
{
long long int rangelow = tuner->tuner.rangelow;
if (!(tuner->tuner.capability & V4L2_TUNER_CAP_LOW))
rangelow *= 1000;
return rangelow;
}
long long int
tuner_get_max_freq(const struct tuner *tuner)
{
long long int rangehigh = tuner->tuner.rangehigh;
if (!(tuner->tuner.capability & V4L2_TUNER_CAP_LOW))
rangehigh *= 1000;
return rangehigh;
}
void
tuner_set_freq(const struct tuner *tuner, long long int freq,
bool override_range)
{
long long int adj_freq;
struct v4l2_frequency vf;
adj_freq = freq;
if (!(tuner->tuner.capability & V4L2_TUNER_CAP_LOW))
adj_freq = (adj_freq + 500) / 1000;
if ((adj_freq < tuner->tuner.rangelow
|| adj_freq > tuner->tuner.rangehigh)
&& !override_range)
fatal(0, "Frequency %.1f MHz out of range (%.1f - %.1f MHz)",
freq / 16000.0,
tuner_get_min_freq(tuner) / 16000.0,
tuner_get_max_freq(tuner) / 16000.0);
memset(&vf, 0, sizeof vf);
vf.tuner = tuner->index;
vf.type = tuner->tuner.type;
vf.frequency = adj_freq;
if (tuner->test) {
tuner->test->freq = adj_freq;
}
else if (ioctl(tuner->fd, VIDIOC_S_FREQUENCY, &vf) == -1)
fatal(errno, "VIDIOC_S_FREQUENCY");
}
int
tuner_get_signal(const struct tuner *tuner)
{
struct v4l2_tuner vt;
query_tuner(tuner, &vt);
return vt.signal;
}
void
tuner_usleep(const struct tuner *tuner, int usecs)
{
if (!tuner->test)
usleep(usecs);
}
void
tuner_sleep(const struct tuner *tuner, int secs)
{
if (!tuner->test)
sleep(secs);
}
/* Queries 'tuner' for a property with the given 'id' and fills in 'qc' with
* the result. If 'tuner' doesn't have such a property, clears 'qc' to
* all-zeros. */
static void
query_control(const struct tuner *tuner, uint32_t id,
struct v4l2_queryctrl *qc)
{
memset(qc, 0, sizeof *qc);
qc->id = id;
if (tuner->test) {
assert(id == V4L2_CID_AUDIO_VOLUME);
if (tuner->test->volume) {
qc->minimum = 1000;
qc->maximum = 2000;
}
} else if (ioctl(tuner->fd, VIDIOC_QUERYCTRL, qc) != -1) {
/* Success. */
} else if (errno == ENOTTY) {
/* This tuner doesn't support 'id'. */
memset(qc, 0, sizeof *qc);
} else {
fatal(errno, "VIDIOC_QUERYCTRL");
}
}
static int32_t
get_control(const struct tuner *tuner, uint32_t id)
{
struct v4l2_control control;
memset(&control, 0, sizeof control);
control.id = id;
if (tuner->test) {
if (id == V4L2_CID_AUDIO_VOLUME)
control.value = tuner->test->volume;
else if (id == V4L2_CID_AUDIO_MUTE)
control.value = tuner->test->mute;
else
abort();
} else if (ioctl(tuner->fd, VIDIOC_G_CTRL, &control) == -1)
fatal(errno, "VIDIOC_G_CTRL");
return control.value;
}
static void
set_control(const struct tuner *tuner, uint32_t id, int32_t value)
{
struct v4l2_control control;
memset(&control, 0, sizeof control);
control.id = id;
control.value = value;
if (tuner->test) {
if (id == V4L2_CID_AUDIO_MUTE) {
assert(value == 0 || value == 1);
tuner->test->mute = value;
} else if (id == V4L2_CID_AUDIO_VOLUME) {
assert(value >= 1000 && value <= 2000);
tuner->test->volume = value;
} else {
abort();
}
} else if (ioctl(tuner->fd, VIDIOC_S_CTRL, &control) == -1)
fatal(errno, "VIDIOC_S_CTRL");
}
static void
query_tuner(const struct tuner *tuner, struct v4l2_tuner *vt)
{
memset(vt, 0, sizeof *vt);
vt->index = tuner->index;
if (tuner->test) {
int freq = tuner->test->freq;
vt->rangelow = 16 * 89;
vt->rangehigh = 16 * 91;
vt->signal = (freq == (int) (16 * 89.6 + .5) ? 64000
: freq == (int) (16 * 90.4 + .5) ? 50000
: freq == (int) (16 * 90.5 + .5) ? 40000
: 1000);
} else if (ioctl(tuner->fd, VIDIOC_G_TUNER, vt) == -1)
fatal(errno, "VIDIOC_G_TUNER");
}