mpd/src/volume.c
Eric Wong 27fad52c6b start using prefixcmp()
LOC reduction and less noise makes things easier for
tired old folks to follow.
2008-09-23 20:48:12 +02:00

535 lines
12 KiB
C

/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "volume.h"
#include "conf.h"
#include "log.h"
#include "player_control.h"
#include "utils.h"
#include "os_compat.h"
#include "../config.h"
#ifdef HAVE_OSS
#include <sys/soundcard.h>
#endif
#ifdef HAVE_ALSA
#include <alsa/asoundlib.h>
#endif
#define VOLUME_MIXER_TYPE_SOFTWARE 0
#define VOLUME_MIXER_TYPE_OSS 1
#define VOLUME_MIXER_TYPE_ALSA 2
#define VOLUME_MIXER_SOFTWARE_DEFAULT ""
#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
#define VOLUME_MIXER_ALSA_DEFAULT "default"
#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM"
#define SW_VOLUME_STATE "sw_volume: "
#ifdef HAVE_OSS
#define VOLUME_MIXER_TYPE_DEFAULT VOLUME_MIXER_TYPE_OSS
#define VOLUME_MIXER_DEVICE_DEFAULT VOLUME_MIXER_OSS_DEFAULT
#else
#ifdef HAVE_ALSA
#define VOLUME_MIXER_TYPE_DEFAULT VOLUME_MIXER_TYPE_ALSA
#define VOLUME_MIXER_DEVICE_DEFAULT VOLUME_MIXER_ALSA_DEFAULT
#else
#define VOLUME_MIXER_TYPE_DEFAULT VOLUME_MIXER_TYPE_SOFTWARE
#define VOLUME_MIXER_DEVICE_DEFAULT VOLUME_MIXER_SOFTWARE_DEFAULT
#endif
#endif
static int volume_mixerType = VOLUME_MIXER_TYPE_DEFAULT;
static const char *volume_mixerDevice = VOLUME_MIXER_DEVICE_DEFAULT;
static int volume_softwareSet = 100;
#ifdef HAVE_OSS
static int volume_ossFd = -1;
static int volume_ossControl = SOUND_MIXER_PCM;
#endif
#ifdef HAVE_ALSA
static snd_mixer_t *volume_alsaMixerHandle;
static snd_mixer_elem_t *volume_alsaElem;
static long volume_alsaMin;
static long volume_alsaMax;
static int volume_alsaSet = -1;
#endif
#ifdef HAVE_OSS
#include <alloca.h> /* only alloca user in mpd atm, may change ... */
static void closeOssMixer(void)
{
while (close(volume_ossFd) && errno == EINTR) ;
volume_ossFd = -1;
}
static int prepOssMixer(const char *device)
{
ConfigParam *param;
if ((volume_ossFd = open(device, O_RDONLY)) < 0) {
WARNING("unable to open oss mixer \"%s\"\n", device);
return -1;
}
if ((param = getConfigParam(CONF_MIXER_CONTROL))) {
const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
int i;
int devmask = 0;
if (ioctl(volume_ossFd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
WARNING("errors getting read_devmask for oss mixer\n");
closeOssMixer();
return -1;
}
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
ssize_t len = strlen(labels[i]);
char *duplicated = alloca(len + 1);
/* eliminate spaces at the end */
memcpy(duplicated, labels[i], len + 1);
len -= 2;
while (len >= 0 && duplicated[len] == ' ')
duplicated[len--] = '\0';
if (strcasecmp(duplicated, param->value) == 0)
break;
}
if (i >= SOUND_MIXER_NRDEVICES) {
WARNING("mixer control \"%s\" not found at line %i\n",
param->value, param->line);
closeOssMixer();
return -1;
} else if (!((1 << i) & devmask)) {
WARNING("mixer control \"%s\" not usable at line %i\n",
param->value, param->line);
closeOssMixer();
return -1;
}
volume_ossControl = i;
}
return 0;
}
static int ensure_oss_open(void)
{
if ((volume_ossFd < 0 && prepOssMixer(volume_mixerDevice) < 0))
return -1;
return 0;
}
static int getOssVolumeLevel(void)
{
int left, right, level;
if (ensure_oss_open() < 0)
return -1;
if (ioctl(volume_ossFd, MIXER_READ(volume_ossControl), &level) < 0) {
closeOssMixer();
WARNING("unable to read volume\n");
return -1;
}
left = level & 0xff;
right = (level & 0xff00) >> 8;
if (left != right) {
WARNING("volume for left and right is not the same, \"%i\" and "
"\"%i\"\n", left, right);
}
return left;
}
static int changeOssVolumeLevel(int change, int rel)
{
int current;
int new;
int level;
if (rel) {
if ((current = getOssVolumeLevel()) < 0)
return -1;
new = current + change;
} else {
if (ensure_oss_open() < 0)
return -1;
new = change;
}
if (new < 0)
new = 0;
else if (new > 100)
new = 100;
level = (new << 8) + new;
if (ioctl(volume_ossFd, MIXER_WRITE(volume_ossControl), &level) < 0) {
closeOssMixer();
return -1;
}
return 0;
}
#endif
#ifdef HAVE_ALSA
static void closeAlsaMixer(void)
{
snd_mixer_close(volume_alsaMixerHandle);
volume_alsaMixerHandle = NULL;
}
static int prepAlsaMixer(const char *card)
{
int err;
snd_mixer_elem_t *elem;
const char *controlName = VOLUME_MIXER_ALSA_CONTROL_DEFAULT;
ConfigParam *param;
err = snd_mixer_open(&volume_alsaMixerHandle, 0);
snd_config_update_free_global();
if (err < 0) {
WARNING("problems opening alsa mixer: %s\n", snd_strerror(err));
return -1;
}
if ((err = snd_mixer_attach(volume_alsaMixerHandle, card)) < 0) {
closeAlsaMixer();
WARNING("problems attaching alsa mixer: %s\n",
snd_strerror(err));
return -1;
}
if ((err =
snd_mixer_selem_register(volume_alsaMixerHandle, NULL,
NULL)) < 0) {
closeAlsaMixer();
WARNING("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
return -1;
}
if ((err = snd_mixer_load(volume_alsaMixerHandle)) < 0) {
closeAlsaMixer();
WARNING("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
return -1;
}
elem = snd_mixer_first_elem(volume_alsaMixerHandle);
param = getConfigParam(CONF_MIXER_CONTROL);
if (param) {
controlName = param->value;
}
while (elem) {
if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
if (strcasecmp(controlName,
snd_mixer_selem_get_name(elem)) == 0) {
break;
}
}
elem = snd_mixer_elem_next(elem);
}
if (elem) {
volume_alsaElem = elem;
snd_mixer_selem_get_playback_volume_range(volume_alsaElem,
&volume_alsaMin,
&volume_alsaMax);
return 0;
}
WARNING("can't find alsa mixer_control \"%s\"\n", controlName);
closeAlsaMixer();
return -1;
}
static int prep_alsa_get_level(long *level)
{
const char *cmd;
int err;
if (!volume_alsaMixerHandle && prepAlsaMixer(volume_mixerDevice) < 0)
return -1;
if ((err = snd_mixer_handle_events(volume_alsaMixerHandle)) < 0) {
cmd = "handle_events";
goto error;
}
if ((err = snd_mixer_selem_get_playback_volume(volume_alsaElem,
SND_MIXER_SCHN_FRONT_LEFT,
level)) < 0) {
cmd = "selem_get_playback_volume";
goto error;
}
return 0;
error:
WARNING("problems getting alsa volume: %s (snd_mixer_%s)\n",
snd_strerror(err), cmd);
closeAlsaMixer();
return -1;
}
static int getAlsaVolumeLevel(void)
{
int ret;
long level;
long max = volume_alsaMax;
long min = volume_alsaMin;
if (prep_alsa_get_level(&level) < 0)
return -1;
ret = ((volume_alsaSet / 100.0) * (max - min) + min) + 0.5;
if (volume_alsaSet > 0 && ret == level) {
ret = volume_alsaSet;
} else
ret = (int)(100 * (((float)(level - min)) / (max - min)) + 0.5);
return ret;
}
static int changeAlsaVolumeLevel(int change, int rel)
{
float vol;
long level;
long test;
long max = volume_alsaMax;
long min = volume_alsaMin;
int err;
if (prep_alsa_get_level(&level) < 0)
return -1;
if (rel) {
test = ((volume_alsaSet / 100.0) * (max - min) + min) + 0.5;
if (volume_alsaSet >= 0 && level == test) {
vol = volume_alsaSet;
} else
vol = 100.0 * (((float)(level - min)) / (max - min));
vol += change;
} else
vol = change;
volume_alsaSet = vol + 0.5;
volume_alsaSet = volume_alsaSet > 100 ? 100 :
(volume_alsaSet < 0 ? 0 : volume_alsaSet);
level = (long)(((vol / 100.0) * (max - min) + min) + 0.5);
level = level > max ? max : level;
level = level < min ? min : level;
if ((err =
snd_mixer_selem_set_playback_volume_all(volume_alsaElem,
level)) < 0) {
WARNING("problems setting alsa volume: %s\n",
snd_strerror(err));
closeAlsaMixer();
return -1;
}
return 0;
}
#endif
static int prepMixer(const char *device)
{
switch (volume_mixerType) {
#ifdef HAVE_ALSA
case VOLUME_MIXER_TYPE_ALSA:
return prepAlsaMixer(device);
#endif
#ifdef HAVE_OSS
case VOLUME_MIXER_TYPE_OSS:
return prepOssMixer(device);
#endif
}
return 0;
}
void finishVolume(void)
{
switch (volume_mixerType) {
#ifdef HAVE_ALSA
case VOLUME_MIXER_TYPE_ALSA:
closeAlsaMixer();
break;
#endif
#ifdef HAVE_OSS
case VOLUME_MIXER_TYPE_OSS:
closeOssMixer();
break;
#endif
}
}
void initVolume(void)
{
ConfigParam *param = getConfigParam(CONF_MIXER_TYPE);
if (param) {
if (0) ;
#ifdef HAVE_ALSA
else if (strcmp(param->value, VOLUME_MIXER_ALSA) == 0) {
volume_mixerType = VOLUME_MIXER_TYPE_ALSA;
volume_mixerDevice = VOLUME_MIXER_ALSA_DEFAULT;
}
#endif
#ifdef HAVE_OSS
else if (strcmp(param->value, VOLUME_MIXER_OSS) == 0) {
volume_mixerType = VOLUME_MIXER_TYPE_OSS;
volume_mixerDevice = VOLUME_MIXER_OSS_DEFAULT;
}
#endif
else if (strcmp(param->value, VOLUME_MIXER_SOFTWARE) == 0) {
volume_mixerType = VOLUME_MIXER_TYPE_SOFTWARE;
volume_mixerDevice = VOLUME_MIXER_SOFTWARE_DEFAULT;
} else {
FATAL("unknown mixer type %s at line %i\n",
param->value, param->line);
}
}
param = getConfigParam(CONF_MIXER_DEVICE);
if (param) {
volume_mixerDevice = param->value;
}
}
void openVolumeDevice(void)
{
if (prepMixer(volume_mixerDevice) < 0) {
WARNING("using software volume\n");
volume_mixerType = VOLUME_MIXER_TYPE_SOFTWARE;
}
}
static int getSoftwareVolume(void)
{
return volume_softwareSet;
}
int getVolumeLevel(void)
{
switch (volume_mixerType) {
#ifdef HAVE_ALSA
case VOLUME_MIXER_TYPE_ALSA:
return getAlsaVolumeLevel();
#endif
#ifdef HAVE_OSS
case VOLUME_MIXER_TYPE_OSS:
return getOssVolumeLevel();
#endif
case VOLUME_MIXER_TYPE_SOFTWARE:
return getSoftwareVolume();
default:
return -1;
}
}
static int changeSoftwareVolume(int change, int rel)
{
int new = change;
if (rel)
new += volume_softwareSet;
if (new > 100)
new = 100;
else if (new < 0)
new = 0;
volume_softwareSet = new;
/*new = 100.0*(exp(new/50.0)-1)/(M_E*M_E-1)+0.5; */
if (new >= 100)
new = 1000;
else if (new <= 0)
new = 0;
else
new =
1000.0 * (exp(new / 25.0) - 1) / (54.5981500331F - 1) + 0.5;
setPlayerSoftwareVolume(new);
return 0;
}
int changeVolumeLevel(int change, int rel)
{
switch (volume_mixerType) {
#ifdef HAVE_ALSA
case VOLUME_MIXER_TYPE_ALSA:
return changeAlsaVolumeLevel(change, rel);
#endif
#ifdef HAVE_OSS
case VOLUME_MIXER_TYPE_OSS:
return changeOssVolumeLevel(change, rel);
#endif
case VOLUME_MIXER_TYPE_SOFTWARE:
return changeSoftwareVolume(change, rel);
default:
return 0;
}
}
void read_sw_volume_state(FILE *fp)
{
char buf[sizeof(SW_VOLUME_STATE) + sizeof("100") - 1];
char *end = NULL;
long int sv;
if (volume_mixerType != VOLUME_MIXER_TYPE_SOFTWARE)
return;
while (myFgets(buf, sizeof(buf), fp)) {
if (prefixcmp(buf, SW_VOLUME_STATE))
continue;
sv = strtol(buf + strlen(SW_VOLUME_STATE), &end, 10);
if (mpd_likely(!*end))
changeSoftwareVolume(sv, 0);
else
ERROR("Can't parse software volume: %s\n", buf);
return;
}
}
void save_sw_volume_state(FILE *fp)
{
if (volume_mixerType == VOLUME_MIXER_TYPE_SOFTWARE)
fprintf(fp, SW_VOLUME_STATE "%d\n", volume_softwareSet);
}