gstreamer/ext/alsa/gstalsamixer.c
Wim Taymans 4b10da5bce ext/alsa/gstalsamixer.c: Less uglyness..
Original commit message from CVS:
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_open):
Less uglyness..
2006-08-14 10:50:15 +00:00

458 lines
12 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
* @short_description: control properties of an audio device
* @see_also: alsasink, alsasrc
*
* <refsect2>
* <para>
* This element controls various aspects such as the volume and balance
* of an audio device using the ALSA api.
* </para>
* <para>
* The application should query and use the interfaces provided by this
* element to control the device.
* </para>
* </refsect2>
*
* Last reviewed on 2006-03-01 (0.10.4)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstalsamixer.h"
/* 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;
}
/* 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_alloca (&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_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 void
gst_alsa_mixer_ensure_track_list (GstAlsaMixer * mixer)
{
gint i, count;
snd_mixer_elem_t *element;
GstMixerTrack *track;
GstMixerOptions *opts;
gboolean first = TRUE;
g_return_if_fail (mixer->handle != NULL);
if (mixer->tracklist)
return;
count = snd_mixer_get_count (mixer->handle);
element = snd_mixer_first_elem (mixer->handle);
/* build track list */
for (i = 0; i < count; i++) {
GList *item;
gint channels = 0, samename = 0;
gint flags = GST_MIXER_TRACK_OUTPUT;
gboolean got_it = FALSE;
if (snd_mixer_selem_has_capture_switch (element)) {
if (!(mixer->dir & GST_ALSA_MIXER_CAPTURE))
goto next;
flags = GST_MIXER_TRACK_INPUT;
} else {
if (!(mixer->dir & GST_ALSA_MIXER_PLAYBACK))
goto next;
}
/* 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 (snd_mixer_selem_get_name (element),
snd_mixer_selem_get_name (temp)))
samename++;
}
if (snd_mixer_selem_has_capture_volume (element)) {
while (snd_mixer_selem_has_capture_channel (element, channels))
channels++;
track = gst_alsa_mixer_track_new (element, samename,
i, channels, flags, GST_ALSA_MIXER_TRACK_CAPTURE);
mixer->tracklist = g_list_append (mixer->tracklist, track);
got_it = TRUE;
/* there might be another volume slider; make that playback */
flags &= ~GST_MIXER_TRACK_INPUT;
flags |= GST_MIXER_TRACK_OUTPUT;
}
if (snd_mixer_selem_has_playback_volume (element)) {
while (snd_mixer_selem_has_playback_channel (element, channels))
channels++;
if (first) {
first = FALSE;
flags |= GST_MIXER_TRACK_MASTER;
}
track = gst_alsa_mixer_track_new (element, samename,
i, channels, flags, GST_ALSA_MIXER_TRACK_PLAYBACK);
mixer->tracklist = g_list_append (mixer->tracklist, track);
got_it = TRUE;
}
if (snd_mixer_selem_is_enumerated (element)) {
opts = gst_alsa_mixer_options_new (element, i);
mixer->tracklist = g_list_append (mixer->tracklist, opts);
got_it = TRUE;
}
if (!got_it) {
if (flags == GST_MIXER_TRACK_OUTPUT &&
snd_mixer_selem_has_playback_switch (element)) {
/* simple mute switch */
track = gst_alsa_mixer_track_new (element, samename,
i, 0, flags, GST_ALSA_MIXER_TRACK_PLAYBACK);
mixer->tracklist = g_list_append (mixer->tracklist, track);
}
}
next:
element = snd_mixer_elem_next (element);
}
}
/* 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);
ret->device = g_strdup (device);
ret->dir = dir;
if (!gst_alsa_mixer_open (ret))
goto error;
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->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_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;
}
static void
gst_alsa_mixer_update (GstAlsaMixer * mixer, GstAlsaMixerTrack * alsa_track)
{
GstMixerTrack *track = (GstMixerTrack *) alsa_track;
int v = 0;
snd_mixer_handle_events (mixer->handle);
if (!alsa_track)
return;
/* Any updates in flags? */
if (snd_mixer_selem_has_playback_switch (alsa_track->element)) {
snd_mixer_selem_get_playback_switch (alsa_track->element, 0, &v);
if (v)
track->flags &= ~GST_MIXER_TRACK_MUTE;
else
track->flags |= GST_MIXER_TRACK_MUTE;
}
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CAPTURE) {
snd_mixer_selem_get_capture_switch (alsa_track->element, 0, &v);
if (!v)
track->flags &= ~GST_MIXER_TRACK_RECORD;
else
track->flags |= GST_MIXER_TRACK_RECORD;
}
}
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);
gst_alsa_mixer_update (mixer, alsa_track);
if (track->flags & GST_MIXER_TRACK_MUTE &&
!snd_mixer_selem_has_playback_switch (alsa_track->element)) {
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;
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PLAYBACK) {
snd_mixer_selem_get_playback_volume (alsa_track->element, i, &tmp);
} else if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CAPTURE) {
snd_mixer_selem_get_capture_volume (alsa_track->element, i, &tmp);
}
alsa_track->volumes[i] = volumes[i] = (gint) tmp;
}
}
}
void
gst_alsa_mixer_set_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
gint * volumes)
{
gint i;
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
g_return_if_fail (mixer->handle != NULL);
gst_alsa_mixer_update (mixer, alsa_track);
/* only set the volume with ALSA lib if the track isn't muted. */
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
if (!(track->flags & GST_MIXER_TRACK_MUTE) ||
snd_mixer_selem_has_playback_switch (alsa_track->element)) {
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PLAYBACK) {
snd_mixer_selem_set_playback_volume (alsa_track->element, i,
(long) volumes[i]);
} else if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CAPTURE) {
snd_mixer_selem_set_capture_volume (alsa_track->element, i,
(long) volumes[i]);
}
}
}
}
void
gst_alsa_mixer_set_mute (GstAlsaMixer * mixer, GstMixerTrack * track,
gboolean mute)
{
gint i;
GstAlsaMixerTrack *alsa_track = GST_ALSA_MIXER_TRACK (track);
g_return_if_fail (mixer->handle != NULL);
gst_alsa_mixer_update (mixer, alsa_track);
if (mute) {
track->flags |= GST_MIXER_TRACK_MUTE;
} else {
track->flags &= ~GST_MIXER_TRACK_MUTE;
}
if (snd_mixer_selem_has_playback_switch (alsa_track->element)) {
snd_mixer_selem_set_playback_switch_all (alsa_track->element, mute ? 0 : 1);
} else {
for (i = 0; i < track->num_channels; i++) {
long vol = mute ? 0 : alsa_track->volumes[i];
if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CAPTURE) {
snd_mixer_selem_set_capture_volume (alsa_track->element, i, vol);
} else if (alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_PLAYBACK) {
snd_mixer_selem_set_playback_volume (alsa_track->element, i, vol);
}
}
}
}
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);
gst_alsa_mixer_update (mixer, alsa_track);
if (record) {
track->flags |= GST_MIXER_TRACK_RECORD;
} else {
track->flags &= ~GST_MIXER_TRACK_RECORD;
}
snd_mixer_selem_set_capture_switch_all (alsa_track->element, record ? 1 : 0);
}
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);
gst_alsa_mixer_update (mixer, NULL);
for (item = opts->values; item != NULL; item = item->next, n++) {
if (!strcmp (item->data, value)) {
idx = n;
break;
}
}
if (idx == -1)
return;
snd_mixer_selem_set_enum_item (alsa_opts->element, 0, idx);
}
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);
gst_alsa_mixer_update (mixer, NULL);
ret = snd_mixer_selem_get_enum_item (alsa_opts->element, 0, &idx);
if (ret == 0)
return g_list_nth_data (opts->values, idx);
else
return snd_strerror (ret); /* feeble attempt at error handling */
}