alsa-utils/alsaloop/control.c

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/*
* A simple PCM loopback utility
* Copyright (c) 2010 by Jaroslav Kysela <perex@perex.cz>
*
* Author: Jaroslav Kysela <perex@perex.cz>
*
*
* 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 <ctype.h>
#include <syslog.h>
#include <alsa/asoundlib.h>
#include "alsaloop.h"
static char *id_str(snd_ctl_elem_id_t *id)
{
static char str[128];
sprintf(str, "%i,%s,%i,%i,%s,%i",
snd_ctl_elem_id_get_numid(id),
snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(id)),
snd_ctl_elem_id_get_device(id),
snd_ctl_elem_id_get_subdevice(id),
snd_ctl_elem_id_get_name(id),
snd_ctl_elem_id_get_index(id));
return str;
}
int control_parse_id(const char *str, snd_ctl_elem_id_t *id)
{
int c, size, numid;
char *ptr;
while (*str == ' ' || *str == '\t')
str++;
if (!(*str))
return -EINVAL;
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER); /* default */
while (*str) {
if (!strncasecmp(str, "numid=", 6)) {
str += 6;
numid = atoi(str);
if (numid <= 0) {
logit(LOG_CRIT, "Invalid numid %d\n", numid);
return -EINVAL;
}
snd_ctl_elem_id_set_numid(id, atoi(str));
while (isdigit(*str))
str++;
} else if (!strncasecmp(str, "iface=", 6)) {
str += 6;
if (!strncasecmp(str, "card", 4)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_CARD);
str += 4;
} else if (!strncasecmp(str, "mixer", 5)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
str += 5;
} else if (!strncasecmp(str, "pcm", 3)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM);
str += 3;
} else if (!strncasecmp(str, "rawmidi", 7)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_RAWMIDI);
str += 7;
} else if (!strncasecmp(str, "timer", 5)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_TIMER);
str += 5;
} else if (!strncasecmp(str, "sequencer", 9)) {
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_SEQUENCER);
str += 9;
} else {
return -EINVAL;
}
} else if (!strncasecmp(str, "name=", 5)) {
char buf[64];
str += 5;
ptr = buf;
size = 0;
if (*str == '\'' || *str == '\"') {
c = *str++;
while (*str && *str != c) {
if (size < (int)sizeof(buf)) {
*ptr++ = *str;
size++;
}
str++;
}
if (*str == c)
str++;
} else {
while (*str && *str != ',') {
if (size < (int)sizeof(buf)) {
*ptr++ = *str;
size++;
}
str++;
}
}
*ptr = '\0';
snd_ctl_elem_id_set_name(id, buf);
} else if (!strncasecmp(str, "index=", 6)) {
str += 6;
snd_ctl_elem_id_set_index(id, atoi(str));
while (isdigit(*str))
str++;
} else if (!strncasecmp(str, "device=", 7)) {
str += 7;
snd_ctl_elem_id_set_device(id, atoi(str));
while (isdigit(*str))
str++;
} else if (!strncasecmp(str, "subdevice=", 10)) {
str += 10;
snd_ctl_elem_id_set_subdevice(id, atoi(str));
while (isdigit(*str))
str++;
}
if (*str == ',') {
str++;
} else {
if (*str)
return -EINVAL;
}
}
return 0;
}
int control_id_match(snd_ctl_elem_id_t *id1, snd_ctl_elem_id_t *id2)
{
if (snd_ctl_elem_id_get_interface(id1) !=
snd_ctl_elem_id_get_interface(id2))
return 0;
if (snd_ctl_elem_id_get_device(id1) !=
snd_ctl_elem_id_get_device(id2))
return 0;
if (snd_ctl_elem_id_get_subdevice(id1) !=
snd_ctl_elem_id_get_subdevice(id2))
return 0;
if (strcmp(snd_ctl_elem_id_get_name(id1),
snd_ctl_elem_id_get_name(id2)) != 0)
return 0;
if (snd_ctl_elem_id_get_index(id1) !=
snd_ctl_elem_id_get_index(id2))
return 0;
return 1;
}
static int control_init1(struct loopback_handle *lhandle,
struct loopback_control *ctl)
{
int err;
snd_ctl_elem_info_set_id(ctl->info, ctl->id);
snd_ctl_elem_value_set_id(ctl->value, ctl->id);
if (lhandle->ctl == NULL) {
logit(LOG_WARNING, "Unable to read control info for '%s'\n", id_str(ctl->id));
return -EIO;
}
err = snd_ctl_elem_info(lhandle->ctl, ctl->info);
if (err < 0) {
logit(LOG_WARNING, "Unable to read control info '%s': %s\n", id_str(ctl->id), snd_strerror(err));
return err;
}
err = snd_ctl_elem_read(lhandle->ctl, ctl->value);
if (err < 0) {
logit(LOG_WARNING, "Unable to read control value (init1) '%s': %s\n", id_str(ctl->id), snd_strerror(err));
return err;
}
return 0;
}
static int copy_value(struct loopback_control *dst,
struct loopback_control *src)
{
snd_ctl_elem_type_t type;
unsigned int count;
int i;
type = snd_ctl_elem_info_get_type(dst->info);
count = snd_ctl_elem_info_get_count(dst->info);
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
for (i = 0; i < count; i++)
snd_ctl_elem_value_set_boolean(dst->value,
i, snd_ctl_elem_value_get_boolean(src->value, i));
break;
case SND_CTL_ELEM_TYPE_INTEGER:
for (i = 0; i < count; i++) {
snd_ctl_elem_value_set_integer(dst->value,
i, snd_ctl_elem_value_get_integer(src->value, i));
}
break;
default:
logit(LOG_CRIT, "Unable to copy control value for type %s\n", snd_ctl_elem_type_name(type));
return -EINVAL;
}
return 0;
}
static int oss_set(struct loopback *loop,
struct loopback_ossmixer *ossmix,
int enable)
{
char buf[128], file[128];
int fd;
if (loop->capt->card_number < 0)
return 0;
if (!enable) {
sprintf(buf, "%s \"\" 0\n", ossmix->oss_id);
} else {
sprintf(buf, "%s \"%s\" %i\n", ossmix->oss_id, ossmix->alsa_id, ossmix->alsa_index);
}
sprintf(file, "/proc/asound/card%i/oss_mixer", loop->capt->card_number);
if (verbose)
snd_output_printf(loop->output, "%s: Initialize OSS volume %s: %s", loop->id, file, buf);
fd = open(file, O_WRONLY);
if (fd >= 0 && write(fd, buf, strlen(buf)) == strlen(buf)) {
close(fd);
return 0;
}
if (fd >= 0)
close(fd);
logit(LOG_INFO, "%s: Unable to initialize OSS Mixer ID '%s'\n", loop->id, ossmix->oss_id);
return -1;
}
static int control_init2(struct loopback *loop,
struct loopback_mixer *mix)
{
snd_ctl_elem_type_t type;
unsigned int count;
int err;
snd_ctl_elem_info_copy(mix->dst.info, mix->src.info);
snd_ctl_elem_info_set_id(mix->dst.info, mix->dst.id);
snd_ctl_elem_value_clear(mix->dst.value);
snd_ctl_elem_value_set_id(mix->dst.value, mix->dst.id);
type = snd_ctl_elem_info_get_type(mix->dst.info);
count = snd_ctl_elem_info_get_count(mix->dst.info);
snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id);
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
err = snd_ctl_elem_add_boolean(loop->capt->ctl,
mix->dst.id, count);
copy_value(&mix->dst, &mix->src);
break;
case SND_CTL_ELEM_TYPE_INTEGER:
err = snd_ctl_elem_add_integer(loop->capt->ctl,
mix->dst.id, count,
snd_ctl_elem_info_get_min(mix->dst.info),
snd_ctl_elem_info_get_max(mix->dst.info),
snd_ctl_elem_info_get_step(mix->dst.info));
copy_value(&mix->dst, &mix->src);
break;
default:
logit(LOG_CRIT, "Unable to handle control type %s\n", snd_ctl_elem_type_name(type));
err = -EINVAL;
break;
}
if (err < 0) {
logit(LOG_CRIT, "Unable to create control '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
err = snd_ctl_elem_unlock(loop->capt->ctl, mix->dst.id);
if (err < 0) {
logit(LOG_CRIT, "Unable to unlock control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
err = snd_ctl_elem_info(loop->capt->ctl, mix->dst.info);
if (err < 0) {
logit(LOG_CRIT, "Unable to read control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
if (snd_ctl_elem_info_is_tlv_writable(mix->dst.info)) {
unsigned int tlv[64];
err = snd_ctl_elem_tlv_read(loop->play->ctl,
mix->src.id,
tlv, sizeof(tlv));
if (err < 0) {
logit(LOG_CRIT, "Unable to read TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
tlv[0] = tlv[1] = 0;
}
err = snd_ctl_elem_tlv_write(loop->capt->ctl,
mix->dst.id,
tlv);
if (err < 0) {
logit(LOG_CRIT, "Unable to write TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
return err;
}
}
err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value);
if (err < 0) {
logit(LOG_CRIT, "Unable to write control value '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
return 0;
}
int control_init(struct loopback *loop)
{
struct loopback_mixer *mix;
struct loopback_ossmixer *ossmix;
int err;
for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next)
oss_set(loop, ossmix, 0);
for (mix = loop->controls; mix; mix = mix->next) {
err = control_init1(loop->play, &mix->src);
if (err < 0) {
logit(LOG_WARNING, "%s: Disabling playback control '%s'\n", loop->id, id_str(mix->src.id));
mix->skip = 1;
continue;
}
err = control_init2(loop, mix);
if (err < 0)
return err;
}
for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) {
err = oss_set(loop, ossmix, 1);
if (err < 0) {
ossmix->skip = 1;
logit(LOG_WARNING, "%s: Disabling OSS mixer ID '%s'\n", loop->id, ossmix->oss_id);
}
}
return 0;
}
int control_done(struct loopback *loop)
{
struct loopback_mixer *mix;
struct loopback_ossmixer *ossmix;
int err;
if (loop->capt->ctl == NULL)
return 0;
for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) {
err = oss_set(loop, ossmix, 0);
if (err < 0)
logit(LOG_WARNING, "%s: Unable to remove OSS control '%s'\n", loop->id, ossmix->oss_id);
}
for (mix = loop->controls; mix; mix = mix->next) {
if (mix->skip)
continue;
err = snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id);
if (err < 0)
logit(LOG_WARNING, "%s: Unable to remove control '%s': %s\n", loop->id, id_str(mix->dst.id), snd_strerror(err));
}
return 0;
}
static int control_event1(struct loopback *loop,
struct loopback_mixer *mix,
snd_ctl_event_t *ev,
int capture)
{
unsigned int mask = snd_ctl_event_elem_get_mask(ev);
int err;
if (mask == SND_CTL_EVENT_MASK_REMOVE)
return 0;
if ((mask & SND_CTL_EVENT_MASK_VALUE) == 0)
return 0;
if (!capture) {
snd_ctl_elem_value_set_id(mix->src.value, mix->src.id);
err = snd_ctl_elem_read(loop->play->ctl, mix->src.value);
if (err < 0) {
logit(LOG_CRIT, "Unable to read control value (event1) '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
return err;
}
copy_value(&mix->dst, &mix->src);
err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value);
if (err < 0) {
logit(LOG_CRIT, "Unable to write control value (event1) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
} else {
err = snd_ctl_elem_read(loop->capt->ctl, mix->dst.value);
if (err < 0) {
logit(LOG_CRIT, "Unable to read control value (event2) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
return err;
}
copy_value(&mix->src, &mix->dst);
err = snd_ctl_elem_write(loop->play->ctl, mix->src.value);
if (err < 0) {
logit(LOG_CRIT, "Unable to write control value (event2) '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
return err;
}
}
return 0;
}
int control_event(struct loopback_handle *lhandle, snd_ctl_event_t *ev)
{
snd_ctl_elem_id_t *id2;
struct loopback_mixer *mix;
int capt = lhandle == lhandle->loopback->capt;
int err;
snd_ctl_elem_id_alloca(&id2);
snd_ctl_event_elem_get_id(ev, id2);
for (mix = lhandle->loopback->controls; mix; mix = mix->next) {
if (mix->skip)
continue;
if (control_id_match(id2, capt ? mix->dst.id : mix->src.id)) {
err = control_event1(lhandle->loopback, mix, ev, capt);
if (err < 0)
return err;
}
}
return 0;
}