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i3status/src/print_volume.c

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// vim:ts=4:sw=4:expandtab
#include <config.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <ctype.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#ifdef __linux__
#include <alsa/asoundlib.h>
#include <alloca.h>
#include <math.h>
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__)
#include <fcntl.h>
#include <unistd.h>
#include <sys/soundcard.h>
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
#include <fcntl.h>
#include <unistd.h>
#include <sys/audioio.h>
#include <sys/ioctl.h>
#endif
#include "i3status.h"
#include "queue.h"
#define STRING_SIZE 10
#define ALSA_VOLUME(channel) \
err = snd_mixer_selem_get_##channel##_dB_range(elem, &min, &max) || \
snd_mixer_selem_get_##channel##_dB(elem, 0, &val); \
if (err != 0 || min >= max) { \
err = snd_mixer_selem_get_##channel##_volume_range(elem, &min, &max) || \
snd_mixer_selem_get_##channel##_volume(elem, 0, &val); \
force_linear = true; \
}
#define ALSA_MUTE_SWITCH(channel) \
if ((err = snd_mixer_selem_get_##channel##_switch(elem, 0, &pbval)) < 0) \
fprintf(stderr, "i3status: ALSA: " #channel "_switch: %s\n", snd_strerror(err)); \
if (!pbval) { \
START_COLOR("color_degraded"); \
ctx->fmt = ctx->fmt_muted; \
}
static char *apply_volume_format(const char *fmt, int ivolume, const char *devicename) {
char string_volume[STRING_SIZE];
snprintf(string_volume, STRING_SIZE, "%d%s", ivolume, pct_mark);
placeholder_t placeholders[] = {
{.name = "%%", .value = pct_mark},
{.name = "%volume", .value = string_volume},
{.name = "%devicename", .value = devicename}};
const size_t num = sizeof(placeholders) / sizeof(placeholder_t);
return format_placeholders(fmt, &placeholders[0], num);
}
void print_volume(volume_ctx_t *ctx) {
char *outwalk = ctx->buf;
int pbval = 1;
/* Printing volume works with ALSA and PulseAudio at the moment */
if (output_format == O_I3BAR) {
char *instance;
asprintf(&instance, "%s.%s.%d", ctx->device, ctx->mixer, ctx->mixer_idx);
INSTANCE(instance);
free(instance);
}
#if HAS_PULSEAUDIO
/* Try PulseAudio first */
/* If the device name has the format "pulse[:N]" where N is the
* index of the PulseAudio sink then force PulseAudio, optionally
* overriding the default sink */
if (!strncasecmp(ctx->device, "pulse", strlen("pulse"))) {
uint32_t sink_idx = ctx->device[strlen("pulse")] == ':' ? (uint32_t)atoi(ctx->device + strlen("pulse:")) : DEFAULT_SINK_INDEX;
const char *sink_name = ctx->device[strlen("pulse")] == ':' &&
!isdigit(ctx->device[strlen("pulse:")])
? ctx->device + strlen("pulse:")
: NULL;
int cvolume = 0;
char description[MAX_SINK_DESCRIPTION_LEN] = {'\0'};
if (pulse_initialize()) {
cvolume = volume_pulseaudio(sink_idx, sink_name);
/* false result means error, stick to empty-string */
if (!description_pulseaudio(sink_idx, sink_name, description)) {
description[0] = '\0';
}
}
int ivolume = DECOMPOSE_VOLUME(cvolume);
bool muted = DECOMPOSE_MUTED(cvolume);
if (muted) {
START_COLOR("color_degraded");
pbval = 0;
}
/* negative result means error, stick to 0 */
if (ivolume < 0)
ivolume = 0;
char *formatted = apply_volume_format(muted ? ctx->fmt_muted : ctx->fmt,
ivolume,
description);
OUTPUT_FORMATTED;
free(formatted);
goto out_with_format;
} else if (!strcasecmp(ctx->device, "default") && pulse_initialize()) {
/* no device specified or "default" set */
char description[MAX_SINK_DESCRIPTION_LEN];
bool success = description_pulseaudio(DEFAULT_SINK_INDEX, NULL, description);
int cvolume = volume_pulseaudio(DEFAULT_SINK_INDEX, NULL);
int ivolume = DECOMPOSE_VOLUME(cvolume);
bool muted = DECOMPOSE_MUTED(cvolume);
if (ivolume >= 0 && success) {
if (muted) {
START_COLOR("color_degraded");
pbval = 0;
}
char *formatted = apply_volume_format(muted ? ctx->fmt_muted : ctx->fmt,
ivolume,
description);
OUTPUT_FORMATTED;
free(formatted);
goto out_with_format;
}
/* negative result or NULL description means error, fail PulseAudio attempt */
}
/* If some other device was specified or PulseAudio is not detected,
* proceed to ALSA / OSS */
#endif
#ifdef __linux__
const long MAX_LINEAR_DB_SCALE = 24;
int err;
snd_mixer_t *m;
snd_mixer_selem_id_t *sid;
snd_mixer_elem_t *elem;
long min, max, val;
const char *mixer_name;
bool force_linear = false;
int avg;
if ((err = snd_mixer_open(&m, 0)) < 0) {
fprintf(stderr, "i3status: ALSA: Cannot open mixer: %s\n", snd_strerror(err));
goto out;
}
/* Attach this mixer handle to the given device */
if ((err = snd_mixer_attach(m, ctx->device)) < 0) {
fprintf(stderr, "i3status: ALSA: Cannot attach mixer to device: %s\n", snd_strerror(err));
snd_mixer_close(m);
goto out;
}
/* Register this mixer */
if ((err = snd_mixer_selem_register(m, NULL, NULL)) < 0) {
fprintf(stderr, "i3status: ALSA: snd_mixer_selem_register: %s\n", snd_strerror(err));
snd_mixer_close(m);
goto out;
}
if ((err = snd_mixer_load(m)) < 0) {
fprintf(stderr, "i3status: ALSA: snd_mixer_load: %s\n", snd_strerror(err));
snd_mixer_close(m);
goto out;
}
snd_mixer_selem_id_malloc(&sid);
if (sid == NULL) {
snd_mixer_close(m);
goto out;
}
/* Find the given mixer */
snd_mixer_selem_id_set_index(sid, ctx->mixer_idx);
snd_mixer_selem_id_set_name(sid, ctx->mixer);
if (!(elem = snd_mixer_find_selem(m, sid))) {
fprintf(stderr, "i3status: ALSA: Cannot find mixer %s (index %u)\n",
snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
snd_mixer_close(m);
snd_mixer_selem_id_free(sid);
goto out;
}
/* Get the volume range to convert the volume later */
snd_mixer_handle_events(m);
if (!strncasecmp(ctx->mixer, "capture", strlen("capture"))) {
ALSA_VOLUME(capture)
} else {
ALSA_VOLUME(playback)
}
if (err != 0) {
fprintf(stderr, "i3status: ALSA: Cannot get playback volume.\n");
goto out;
}
mixer_name = snd_mixer_selem_get_name(elem);
if (!mixer_name) {
fprintf(stderr, "i3status: ALSA: NULL mixer_name.\n");
goto out;
}
/* Use linear mapping for raw register values or small ranges of 24 dB */
if (force_linear || max - min <= MAX_LINEAR_DB_SCALE * 100) {
float avgf = ((float)(val - min) / (max - min)) * 100;
avg = (int)avgf;
avg = (avgf - avg < 0.5 ? avg : (avg + 1));
} else {
/* mapped volume to be more natural for the human ear */
double normalized = exp10((val - max) / 6000.0);
if (min != SND_CTL_TLV_DB_GAIN_MUTE) {
double min_norm = exp10((min - max) / 6000.0);
normalized = (normalized - min_norm) / (1 - min_norm);
}
avg = lround(normalized * 100);
}
/* Check for mute */
if (snd_mixer_selem_has_playback_switch(elem)) {
ALSA_MUTE_SWITCH(playback)
} else if (snd_mixer_selem_has_capture_switch(elem)) {
ALSA_MUTE_SWITCH(capture)
}
char *formatted = apply_volume_format(ctx->fmt, avg, mixer_name);
OUTPUT_FORMATTED;
free(formatted);
snd_mixer_close(m);
snd_mixer_selem_id_free(sid);
goto out_with_format;
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
char *mixerpath;
char defaultmixer[] = "/dev/mixer";
int mixfd, vol, devmask = 0;
const char *devicename = "UNSUPPORTED"; /* TODO: implement support for this */
pbval = 1;
if (ctx->mixer_idx > 0)
asprintf(&mixerpath, "/dev/mixer%d", ctx->mixer_idx);
else
mixerpath = defaultmixer;
if ((mixfd = open(mixerpath, O_RDWR)) < 0) {
#if defined(__NetBSD__) || defined(__OpenBSD__)
warn("audioio: Cannot open mixer");
#else
warn("OSS: Cannot open mixer");
#endif
goto out;
}
if (ctx->mixer_idx > 0)
free(mixerpath);
#if defined(__NetBSD__) || defined(__OpenBSD__)
int oclass_idx = -1, master_idx = -1, master_mute_idx = -1;
int master_next = AUDIO_MIXER_LAST;
mixer_devinfo_t devinfo, devinfo2;
mixer_ctrl_t vinfo;
devinfo.index = 0;
while (ioctl(mixfd, AUDIO_MIXER_DEVINFO, &devinfo) >= 0) {
if (devinfo.type != AUDIO_MIXER_CLASS) {
devinfo.index++;
continue;
}
if (strncmp(devinfo.label.name, AudioCoutputs, MAX_AUDIO_DEV_LEN) == 0)
oclass_idx = devinfo.index;
devinfo.index++;
}
devinfo2.index = 0;
while (ioctl(mixfd, AUDIO_MIXER_DEVINFO, &devinfo2) >= 0) {
if ((devinfo2.type == AUDIO_MIXER_VALUE) && (devinfo2.mixer_class == oclass_idx) && (strncmp(devinfo2.label.name, AudioNmaster, MAX_AUDIO_DEV_LEN) == 0)) {
master_idx = devinfo2.index;
master_next = devinfo2.next;
}
if ((devinfo2.type == AUDIO_MIXER_ENUM) && (devinfo2.mixer_class == oclass_idx) && (strncmp(devinfo2.label.name, AudioNmute, MAX_AUDIO_DEV_LEN) == 0))
if (master_next == devinfo2.index)
master_mute_idx = devinfo2.index;
if (master_next != AUDIO_MIXER_LAST)
master_next = devinfo2.next;
devinfo2.index++;
}
if (master_idx == -1)
goto out;
devinfo.index = master_idx;
if (ioctl(mixfd, AUDIO_MIXER_DEVINFO, &devinfo) == -1)
goto out;
vinfo.dev = master_idx;
vinfo.type = AUDIO_MIXER_VALUE;
vinfo.un.value.num_channels = devinfo.un.v.num_channels;
if (ioctl(mixfd, AUDIO_MIXER_READ, &vinfo) == -1)
goto out;
if (AUDIO_MAX_GAIN != 100) {
float avgf = ((float)vinfo.un.value.level[AUDIO_MIXER_LEVEL_MONO] / AUDIO_MAX_GAIN) * 100;
vol = (int)avgf;
vol = (avgf - vol < 0.5 ? vol : (vol + 1));
} else {
vol = (int)vinfo.un.value.level[AUDIO_MIXER_LEVEL_MONO];
}
if (master_mute_idx != -1) {
vinfo.dev = master_mute_idx;
vinfo.type = AUDIO_MIXER_ENUM;
if (ioctl(mixfd, AUDIO_MIXER_READ, &vinfo) == -1)
goto out;
if (vinfo.un.ord) {
START_COLOR("color_degraded");
ctx->fmt = ctx->fmt_muted;
pbval = 0;
}
}
#else
if (ioctl(mixfd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
warn("OSS: Cannot read mixer information");
goto out;
}
if (ioctl(mixfd, MIXER_READ(0), &vol) == -1) {
warn("OSS: Cannot read mixer information");
goto out;
}
if (((vol & 0x7f) == 0) && (((vol >> 8) & 0x7f) == 0)) {
START_COLOR("color_degraded");
pbval = 0;
}
#endif
ctx->buf = apply_volume_format(ctx->fmt, vol & 0x7f, devicename);
close(mixfd);
goto out_with_format;
#endif
out:
if (!pbval)
END_COLOR;
OUTPUT_FULL_TEXT(ctx->buf);
return;
out_with_format:
if (!pbval)
END_COLOR;
OUTPUT_FULL_TEXT(ctx->buf);
}
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