gstreamer/ext/alsa/gstalsamixer.c
Blaise Gassend 185a8ddcaa alsamixer: Store return values of poll functions in a signed integer
Negative return values are used for errors and storing
them in an unsigned integer will make it impossible to
detect the errors.

Fixes bug #644845.
2011-03-15 19:48:21 +01:00

957 lines
27 KiB
C

/* ALSA mixer implementation.
* Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-alsamixer
* @see_also: alsasink, alsasrc
*
* This element controls various aspects such as the volume and balance
* of an audio device using the ALSA api.
*
* The application should query and use the interfaces provided by this
* element to control the device.
*
* Last reviewed on 2006-03-01 (0.10.4)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstalsamixer.h"
#include <errno.h>
static void gst_alsa_mixer_update_option (GstAlsaMixer * mixer,
GstAlsaMixerOptions * alsa_opts);
static void gst_alsa_mixer_update_track (GstAlsaMixer * mixer,
GstAlsaMixerTrack * alsa_track);
static int gst_alsa_mixer_handle_callback (snd_mixer_t * handle,
unsigned int mask, snd_mixer_elem_t * elem);
/* First some utils, then the mixer implementation */
static gboolean
gst_alsa_mixer_open (GstAlsaMixer * mixer)
{
gint err;
snd_ctl_t *ctl;
snd_ctl_card_info_t *card_info;
g_return_val_if_fail (mixer->handle == NULL, FALSE);
/* open and initialize the mixer device */
err = snd_mixer_open (&mixer->handle, 0);
if (err < 0 || mixer->handle == NULL)
goto open_failed;
if ((err = snd_mixer_attach (mixer->handle, mixer->device)) < 0) {
GST_WARNING ("Cannot open mixer for sound device '%s': %s", mixer->device,
snd_strerror (err));
goto error;
}
if ((err = snd_mixer_selem_register (mixer->handle, NULL, NULL)) < 0) {
GST_WARNING ("Cannot register mixer elements: %s", snd_strerror (err));
goto error;
}
if ((err = snd_mixer_load (mixer->handle)) < 0) {
GST_WARNING ("Cannot load mixer settings: %s", snd_strerror (err));
goto error;
}
snd_mixer_set_callback_private (mixer->handle, mixer);
snd_mixer_set_callback (mixer->handle, gst_alsa_mixer_handle_callback);
/* now get the device name, any of this is not fatal */
g_free (mixer->cardname);
if ((err = snd_ctl_open (&ctl, mixer->device, 0)) < 0) {
GST_WARNING ("Cannot open CTL: %s", snd_strerror (err));
goto no_card_name;
}
snd_ctl_card_info_malloc (&card_info);
if ((err = snd_ctl_card_info (ctl, card_info)) < 0) {
GST_WARNING ("Cannot get card info: %s", snd_strerror (err));
snd_ctl_close (ctl);
goto no_card_name;
}
mixer->cardname = g_strdup (snd_ctl_card_info_get_name (card_info));
GST_DEBUG ("Card name = %s", GST_STR_NULL (mixer->cardname));
snd_ctl_card_info_free (card_info);
snd_ctl_close (ctl);
no_card_name:
if (mixer->cardname == NULL) {
mixer->cardname = g_strdup ("Unknown");
GST_DEBUG ("Cannot find card name");
}
GST_INFO ("Successfully opened mixer for device '%s'.", mixer->device);
return TRUE;
/* ERROR */
open_failed:
{
GST_WARNING ("Cannot open mixer: %s", snd_strerror (err));
mixer->handle = NULL;
return FALSE;
}
error:
{
snd_mixer_close (mixer->handle);
mixer->handle = NULL;
return FALSE;
}
}
static snd_mixer_elem_t *
gst_alsa_mixer_find_master_mixer (GstAlsaMixer * mixer, snd_mixer_t * handle)
{
snd_mixer_elem_t *element;
gint i, count;
count = snd_mixer_get_count (handle);
g_static_rec_mutex_lock (mixer->rec_mutex);
/* Check if we have a playback mixer labelled as 'Master' */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
strcmp (snd_mixer_selem_get_name (element), "Master") == 0) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, check if we have a playback mixer labelled as 'Front' */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
strcmp (snd_mixer_selem_get_name (element), "Front") == 0) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, check if we have a playback mixer labelled as 'PCM' */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
strcmp (snd_mixer_selem_get_name (element), "PCM") == 0) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, check if we have a playback mixer labelled as 'Speaker' */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
strcmp (snd_mixer_selem_get_name (element), "Speaker") == 0) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, check if we have a playback mixer with both volume and switch that
* is not mono */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
snd_mixer_selem_has_playback_switch (element) &&
!snd_mixer_selem_is_playback_mono (element)) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, check if we have any playback mixer with both volume and switch */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element) &&
snd_mixer_selem_has_playback_switch (element)) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
/* If not, take any playback mixer with a volume control */
element = snd_mixer_first_elem (handle);
for (i = 0; i < count; i++) {
if (snd_mixer_selem_has_playback_volume (element)) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return element;
}
element = snd_mixer_elem_next (element);
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
/* Looks like we're out of luck ... */
return NULL;
}
static void
gst_alsa_mixer_update (GstAlsaMixer * mixer, snd_mixer_elem_t * elem)
{
GList *item;
g_return_if_fail (mixer != NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
for (item = mixer->tracklist; item != NULL; item = item->next) {
if (GST_IS_ALSA_MIXER_TRACK (item->data)) {
if (elem && (GST_ALSA_MIXER_TRACK (item->data)->element != elem))
continue;
gst_alsa_mixer_update_track (mixer, GST_ALSA_MIXER_TRACK (item->data));
} else if (GST_IS_ALSA_MIXER_OPTIONS (item->data)) {
if (elem && (GST_ALSA_MIXER_OPTIONS (item->data)->element != elem))
continue;
gst_alsa_mixer_update_option (mixer, GST_ALSA_MIXER_OPTIONS (item->data));
}
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
static int
gst_alsa_mixer_elem_handle_callback (snd_mixer_elem_t * elem, unsigned int mask)
{
GstAlsaMixer *mixer =
(GstAlsaMixer *) snd_mixer_elem_get_callback_private (elem);
GST_LOG ("ALSA elem cb");
g_return_val_if_fail (mixer != NULL, 1);
gst_alsa_mixer_update (mixer, elem);
return 0;
}
static int
gst_alsa_mixer_handle_callback (snd_mixer_t * handle, unsigned int mask,
snd_mixer_elem_t * elem)
{
GstAlsaMixer *mixer =
(GstAlsaMixer *) snd_mixer_get_callback_private (handle);
GST_LOG ("ALSA cb");
g_return_val_if_fail (mixer != NULL, 1);
/* Hopefully won't be call recursively and will handle pending elem events */
snd_mixer_handle_events (mixer->handle);
gst_alsa_mixer_update (mixer, elem);
return 0;
}
static void
gst_alsa_mixer_ensure_track_list (GstAlsaMixer * mixer)
{
gint i, count;
snd_mixer_elem_t *element, *master;
GList *item;
g_return_if_fail (mixer->handle != NULL);
if (mixer->tracklist)
return;
g_static_rec_mutex_lock (mixer->rec_mutex);
master = gst_alsa_mixer_find_master_mixer (mixer, mixer->handle);
count = snd_mixer_get_count (mixer->handle);
element = snd_mixer_first_elem (mixer->handle);
/* build track list
*
* Some ALSA tracks may have playback and capture capabilities.
* Here we model them as two separate GStreamer tracks.
*/
for (i = 0; i < count; i++) {
GstMixerTrack *play_track = NULL;
GstMixerTrack *cap_track = NULL;
const gchar *name;
GList *item;
gint samename = 0;
name = snd_mixer_selem_get_name (element);
/* prevent dup names */
for (item = mixer->tracklist; item != NULL; item = item->next) {
snd_mixer_elem_t *temp;
if (GST_IS_ALSA_MIXER_OPTIONS (item->data))
temp = GST_ALSA_MIXER_OPTIONS (item->data)->element;
else
temp = GST_ALSA_MIXER_TRACK (item->data)->element;
if (strcmp (name, snd_mixer_selem_get_name (temp)) == 0)
samename++;
}
GST_LOG ("[%s] probing element #%u, mixer->dir=%u", name, i, mixer->dir);
if (mixer->dir & GST_ALSA_MIXER_PLAYBACK) {
gboolean has_playback_switch, has_playback_volume;
has_playback_switch = snd_mixer_selem_has_playback_switch (element);
has_playback_volume = snd_mixer_selem_has_playback_volume (element);
GST_LOG ("[%s] PLAYBACK: has_playback_volume=%d, has_playback_switch=%d"
"%s", name, has_playback_volume, has_playback_switch,
(element == master) ? " MASTER" : "");
if (has_playback_volume) {
gint flags = GST_MIXER_TRACK_OUTPUT;
if (element == master)
flags |= GST_MIXER_TRACK_MASTER;
play_track = gst_alsa_mixer_track_new (element, samename, i,
flags, FALSE, NULL, FALSE);
} else if (has_playback_switch) {
/* simple mute switch */
play_track = gst_alsa_mixer_track_new (element, samename, i,
GST_MIXER_TRACK_OUTPUT, TRUE, NULL, FALSE);
}
if (snd_mixer_selem_is_enumerated (element)) {
GstMixerOptions *opts = gst_alsa_mixer_options_new (element, i);
GST_LOG ("[%s] is enumerated (%d)", name, i);
mixer->tracklist = g_list_append (mixer->tracklist, opts);
}
}
if (mixer->dir & GST_ALSA_MIXER_CAPTURE) {
gboolean has_capture_switch, has_common_switch;
gboolean has_capture_volume, has_common_volume;
has_capture_switch = snd_mixer_selem_has_capture_switch (element);
has_common_switch = snd_mixer_selem_has_common_switch (element);
has_capture_volume = snd_mixer_selem_has_capture_volume (element);
has_common_volume = snd_mixer_selem_has_common_volume (element);
GST_LOG ("[%s] CAPTURE: has_capture_volume=%d, has_common_volume=%d, "
"has_capture_switch=%d, has_common_switch=%d, play_track=%p", name,
has_capture_volume, has_common_volume, has_capture_switch,
has_common_switch, play_track);
if (has_capture_volume && !(play_track && has_common_volume)) {
cap_track = gst_alsa_mixer_track_new (element, samename, i,
GST_MIXER_TRACK_INPUT, FALSE, NULL, play_track != NULL);
} else if (has_capture_switch && !(play_track && has_common_switch)) {
cap_track = gst_alsa_mixer_track_new (element, samename, i,
GST_MIXER_TRACK_INPUT, TRUE, NULL, play_track != NULL);
}
}
if (play_track && cap_track) {
GST_ALSA_MIXER_TRACK (play_track)->shared_mute =
GST_ALSA_MIXER_TRACK (cap_track);
GST_ALSA_MIXER_TRACK (cap_track)->shared_mute =
GST_ALSA_MIXER_TRACK (play_track);
}
if (play_track)
mixer->tracklist = g_list_append (mixer->tracklist, play_track);
if (cap_track)
mixer->tracklist = g_list_append (mixer->tracklist, cap_track);
element = snd_mixer_elem_next (element);
}
for (item = mixer->tracklist; item != NULL; item = item->next) {
snd_mixer_elem_t *temp;
if (GST_IS_ALSA_MIXER_OPTIONS (item->data))
temp = GST_ALSA_MIXER_OPTIONS (item->data)->element;
else
temp = GST_ALSA_MIXER_TRACK (item->data)->element;
snd_mixer_elem_set_callback (temp, gst_alsa_mixer_elem_handle_callback);
snd_mixer_elem_set_callback_private (temp, mixer);
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
static void
task_monitor_alsa (gpointer data)
{
struct pollfd *pfds;
int nfds, rnfds;
unsigned short revents;
GstAlsaMixer *mixer = (GstAlsaMixer *) data;
gint ret;
g_static_rec_mutex_lock (mixer->rec_mutex);
nfds = snd_mixer_poll_descriptors_count (mixer->handle);
if (nfds <= 0) {
GST_ERROR ("snd_mixer_poll_descriptors_count <= 0: %d", nfds);
/* FIXME: sleep ? stop monitoring ? */
g_static_rec_mutex_unlock (mixer->rec_mutex);
return;
}
pfds = g_newa (struct pollfd, nfds + 1);
rnfds = snd_mixer_poll_descriptors (mixer->handle, pfds, nfds);
g_assert (rnfds <= nfds);
if (rnfds < 0) {
GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), ("alsa error: %s",
snd_strerror (rnfds)));
gst_task_pause (mixer->task);
g_static_rec_mutex_unlock (mixer->rec_mutex);
return;
}
pfds[rnfds].fd = mixer->pfd[0];
pfds[rnfds].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
pfds[rnfds].revents = 0;
g_static_rec_mutex_unlock (mixer->rec_mutex);
GST_LOG ("task loop");
ret = poll (pfds, rnfds + 1, -1);
if (ret < 0) {
GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
gst_task_pause (mixer->task);
return;
}
g_static_rec_mutex_lock (mixer->rec_mutex);
ret =
snd_mixer_poll_descriptors_revents (mixer->handle, pfds, nfds, &revents);
if (ret < 0) {
GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), ("alsa error: %s",
snd_strerror (ret)));
gst_task_pause (mixer->task);
} else if (revents & (POLLIN | POLLPRI)) {
GST_DEBUG ("Handling events");
snd_mixer_handle_events (mixer->handle);
} else if (revents & (POLLERR | POLLNVAL | POLLHUP)) {
GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), (NULL));
gst_task_pause (mixer->task);
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
/* API */
GstAlsaMixer *
gst_alsa_mixer_new (const char *device, GstAlsaMixerDirection dir)
{
GstAlsaMixer *ret = NULL;
g_return_val_if_fail (device != NULL, NULL);
ret = g_new0 (GstAlsaMixer, 1);
if (pipe (ret->pfd) == -1)
goto error;
ret->rec_mutex = g_new (GStaticRecMutex, 1);
g_static_rec_mutex_init (ret->rec_mutex);
ret->task_mutex = g_new (GStaticRecMutex, 1);
g_static_rec_mutex_init (ret->task_mutex);
ret->task = gst_task_create (task_monitor_alsa, ret);
gst_task_set_lock (ret->task, ret->task_mutex);
ret->device = g_strdup (device);
ret->dir = dir;
if (!gst_alsa_mixer_open (ret))
goto error;
if (gst_task_start (ret->task) == FALSE) {
GST_WARNING ("Could not start alsamixer task");
}
return ret;
/* ERRORS */
error:
{
gst_alsa_mixer_free (ret);
return NULL;
}
}
void
gst_alsa_mixer_free (GstAlsaMixer * mixer)
{
g_return_if_fail (mixer != NULL);
if (mixer->task) {
if (write (mixer->pfd[1], "stop", 5) <= 0) {
GST_ERROR ("Cannot send " "stop" " to alsamixer task");
close (mixer->pfd[1]);
mixer->pfd[1] = -1;
}
if (gst_task_join (mixer->task) == FALSE) {
GST_ERROR ("Cannot join alsamixer task");
}
gst_object_unref (mixer->task);
mixer->task = NULL;
}
g_static_rec_mutex_free (mixer->task_mutex);
g_free (mixer->task_mutex);
mixer->task_mutex = NULL;
if (mixer->pfd[0] > 0) {
close (mixer->pfd[0]);
mixer->pfd[0] = -1;
}
if (mixer->pfd[1] > 0) {
close (mixer->pfd[1]);
mixer->pfd[1] = -1;
}
if (mixer->interface) {
g_object_unref (G_OBJECT (mixer->interface));
mixer->interface = NULL;
}
if (mixer->device) {
g_free (mixer->device);
mixer->device = NULL;
}
if (mixer->cardname) {
g_free (mixer->cardname);
mixer->cardname = NULL;
}
if (mixer->tracklist) {
g_list_foreach (mixer->tracklist, (GFunc) g_object_unref, NULL);
g_list_free (mixer->tracklist);
mixer->tracklist = NULL;
}
if (mixer->handle) {
snd_mixer_close (mixer->handle);
mixer->handle = NULL;
}
g_static_rec_mutex_free (mixer->rec_mutex);
g_free (mixer->rec_mutex);
mixer->rec_mutex = NULL;
g_free (mixer);
}
const GList *
gst_alsa_mixer_list_tracks (GstAlsaMixer * mixer)
{
g_return_val_if_fail (mixer->handle != NULL, NULL);
gst_alsa_mixer_ensure_track_list (mixer);
return (const GList *) mixer->tracklist;
}
void
gst_alsa_mixer_get_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
gint * volumes)
{
gint i;
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
g_return_if_fail (mixer->handle != NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
gst_alsa_mixer_track_update (alsa_track);
if (track->flags & GST_MIXER_TRACK_OUTPUT) { /* return playback volume */
/* Is emulated mute flag activated? */
if (track->flags & GST_MIXER_TRACK_MUTE &&
!(alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PSWITCH)) {
for (i = 0; i < track->num_channels; i++)
volumes[i] = alsa_track->volumes[i];
} else {
for (i = 0; i < track->num_channels; i++) {
long tmp = 0;
snd_mixer_selem_get_playback_volume (alsa_track->element, i, &tmp);
alsa_track->volumes[i] = volumes[i] = (gint) tmp;
}
}
} else if (track->flags & GST_MIXER_TRACK_INPUT) { /* return capture volume */
/* Is emulated record flag activated? */
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH ||
track->flags & GST_MIXER_TRACK_RECORD) {
for (i = 0; i < track->num_channels; i++) {
long tmp = 0;
snd_mixer_selem_get_capture_volume (alsa_track->element, i, &tmp);
alsa_track->volumes[i] = volumes[i] = (gint) tmp;
}
} else {
for (i = 0; i < track->num_channels; i++)
volumes[i] = alsa_track->volumes[i];
}
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
static gboolean
check_if_volumes_are_the_same (guint num_channels, gint * volumes)
{
guint i;
if (num_channels <= 1)
return TRUE;
for (i = 1; i < num_channels; i++) {
if (volumes[i] != volumes[0])
return FALSE;
}
return TRUE;
}
void
gst_alsa_mixer_set_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
gint * volumes)
{
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
gint i;
g_return_if_fail (mixer->handle != NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
gst_alsa_mixer_track_update (alsa_track);
if (track->flags & GST_MIXER_TRACK_OUTPUT) {
/* Is emulated mute flag activated? */
if (track->flags & GST_MIXER_TRACK_MUTE &&
!(alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PSWITCH)) {
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[i];
} else {
if (check_if_volumes_are_the_same (track->num_channels, volumes)) {
snd_mixer_selem_set_playback_volume_all (alsa_track->element,
volumes[0]);
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[0];
} else {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_playback_volume (alsa_track->element, i,
volumes[i]);
}
}
}
} else if (track->flags & GST_MIXER_TRACK_INPUT) {
/* Is emulated record flag activated? */
if (track->flags & GST_MIXER_TRACK_RECORD ||
alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH) {
if (check_if_volumes_are_the_same (track->num_channels, volumes)) {
snd_mixer_selem_set_capture_volume_all (alsa_track->element,
volumes[0]);
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[0];
} else {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_capture_volume (alsa_track->element, i,
volumes[i]);
}
}
} else {
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[i];
}
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
void
gst_alsa_mixer_set_mute (GstAlsaMixer * mixer, GstMixerTrack * track,
gboolean mute)
{
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
g_return_if_fail (mixer->handle != NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
gst_alsa_mixer_track_update (alsa_track);
if (! !(mute) == ! !(track->flags & GST_MIXER_TRACK_MUTE)) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return;
}
if (mute) {
track->flags |= GST_MIXER_TRACK_MUTE;
if (alsa_track->shared_mute)
((GstMixerTrack *) (alsa_track->shared_mute))->flags |=
GST_MIXER_TRACK_MUTE;
} else {
track->flags &= ~GST_MIXER_TRACK_MUTE;
if (alsa_track->shared_mute)
((GstMixerTrack *) (alsa_track->shared_mute))->flags &=
~GST_MIXER_TRACK_MUTE;
}
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PSWITCH) {
snd_mixer_selem_set_playback_switch_all (alsa_track->element, mute ? 0 : 1);
} else {
gint i;
GstAlsaMixerTrack *ctrl_track;
if ((track->flags & GST_MIXER_TRACK_INPUT)
&& alsa_track->shared_mute != NULL)
ctrl_track = alsa_track->shared_mute;
else
ctrl_track = alsa_track;
for (i = 0; i < ((GstMixerTrack *) ctrl_track)->num_channels; i++) {
long vol =
mute ? ((GstMixerTrack *) ctrl_track)->
min_volume : ctrl_track->volumes[i];
snd_mixer_selem_set_playback_volume (ctrl_track->element, i, vol);
}
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
void
gst_alsa_mixer_set_record (GstAlsaMixer * mixer,
GstMixerTrack * track, gboolean record)
{
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
g_return_if_fail (mixer->handle != NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
gst_alsa_mixer_track_update (alsa_track);
if (! !(record) == ! !(track->flags & GST_MIXER_TRACK_RECORD)) {
g_static_rec_mutex_unlock (mixer->rec_mutex);
return;
}
if (record) {
track->flags |= GST_MIXER_TRACK_RECORD;
} else {
track->flags &= ~GST_MIXER_TRACK_RECORD;
}
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH) {
snd_mixer_selem_set_capture_switch_all (alsa_track->element,
record ? 1 : 0);
/* update all tracks in same exlusive cswitch group */
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH_EXCL) {
GList *item;
for (item = mixer->tracklist; item != NULL; item = item->next) {
if (GST_IS_ALSA_MIXER_TRACK (item->data)) {
GstAlsaMixerTrack *item_alsa_track =
GST_ALSA_MIXER_TRACK (item->data);
if (item_alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH_EXCL &&
item_alsa_track->capture_group == alsa_track->capture_group) {
gst_alsa_mixer_track_update (item_alsa_track);
}
}
}
}
} else {
gint i;
for (i = 0; i < track->num_channels; i++) {
long vol = record ? alsa_track->volumes[i] : track->min_volume;
snd_mixer_selem_set_capture_volume (alsa_track->element, i, vol);
}
}
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
void
gst_alsa_mixer_set_option (GstAlsaMixer * mixer,
GstMixerOptions * opts, gchar * value)
{
gint idx = -1, n = 0;
GList *item;
GstAlsaMixerOptions *alsa_opts = GST_ALSA_MIXER_OPTIONS (opts);
g_return_if_fail (mixer->handle != NULL);
for (item = opts->values; item != NULL; item = item->next, n++) {
if (!strcmp (item->data, value)) {
idx = n;
break;
}
}
if (idx == -1)
return;
g_static_rec_mutex_lock (mixer->rec_mutex);
snd_mixer_selem_set_enum_item (alsa_opts->element, 0, idx);
g_static_rec_mutex_unlock (mixer->rec_mutex);
}
const gchar *
gst_alsa_mixer_get_option (GstAlsaMixer * mixer, GstMixerOptions * opts)
{
gint ret;
guint idx;
GstAlsaMixerOptions *alsa_opts = GST_ALSA_MIXER_OPTIONS (opts);
g_return_val_if_fail (mixer->handle != NULL, NULL);
g_static_rec_mutex_lock (mixer->rec_mutex);
ret = snd_mixer_selem_get_enum_item (alsa_opts->element, 0, &idx);
g_static_rec_mutex_unlock (mixer->rec_mutex);
if (ret == 0)
return g_list_nth_data (opts->values, idx);
else
return snd_strerror (ret); /* feeble attempt at error handling */
}
GstMixerFlags
gst_alsa_mixer_get_mixer_flags (GstAlsaMixer * mixer)
{
g_return_val_if_fail (mixer != NULL, GST_MIXER_FLAG_NONE);
return GST_MIXER_FLAG_AUTO_NOTIFICATIONS;
}
static void
gst_alsa_mixer_update_option (GstAlsaMixer * mixer,
GstAlsaMixerOptions * alsa_opts)
{
gint ret;
guint idx;
/* const */ gchar *option;
if (mixer->interface == NULL) {
GST_WARNING ("Cannot send update notifications, no GstMixer * given");
return;
}
g_static_rec_mutex_lock (mixer->rec_mutex);
ret = snd_mixer_selem_get_enum_item (alsa_opts->element, 0, &idx);
g_static_rec_mutex_unlock (mixer->rec_mutex);
if (ret == 0) {
option = g_list_nth_data (GST_MIXER_OPTIONS (alsa_opts)->values, idx);
gst_mixer_option_changed (mixer->interface, GST_MIXER_OPTIONS (alsa_opts),
option);
}
}
static void
gst_alsa_mixer_update_track (GstAlsaMixer * mixer,
GstAlsaMixerTrack * alsa_track)
{
GstMixerTrack *track = (GstMixerTrack *) alsa_track;
gboolean old_mute;
gboolean old_record;
gint i, n_channels;
gint *old_volumes;
GST_DEBUG ("Updating track %" GST_PTR_FORMAT, alsa_track);
if (mixer->interface == NULL) {
GST_WARNING ("Cannot send update notifications, no GstMixer * given");
return;
}
old_mute = ! !(GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_MUTE));
old_record = ! !(GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_RECORD));
old_volumes = g_new (gint, track->num_channels);
n_channels = track->num_channels;
memcpy (old_volumes, alsa_track->volumes,
sizeof (gint) * track->num_channels);
gst_alsa_mixer_track_update (alsa_track);
if (old_record !=
! !(GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_RECORD))) {
gst_mixer_record_toggled (mixer->interface, track,
! !GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_RECORD));
}
if (old_mute != ! !(GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_MUTE))) {
gst_mixer_mute_toggled (mixer->interface, track,
! !GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_MUTE));
}
n_channels = MIN (n_channels, track->num_channels);
for (i = 0; i < n_channels; i++) {
if (old_volumes[i] != alsa_track->volumes[i]) {
gst_mixer_volume_changed (mixer->interface, track, alsa_track->volumes);
break;
}
}
g_free (old_volumes);
}
/* utility function for gstalsamixerelement to set the interface */
void
_gst_alsa_mixer_set_interface (GstAlsaMixer * mixer, GstMixer * interface)
{
g_return_if_fail (mixer != NULL && mixer->interface == NULL);
g_return_if_fail (interface != NULL);
mixer->interface = g_object_ref (G_OBJECT (interface));
}