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/* GStreamer OSS4 mixer enumeration control
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* Copyright (C) 2007-2008 Tim-Philipp Müller <tim centricular net>
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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/* An 'enum' in gnome-volume-control / GstMixer is represented by a
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* GstMixerOptions object
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#include <gst/gst-i18n-plugin.h>
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#define NO_LEGACY_MIXER
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#include "oss4-mixer.h"
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#include "oss4-mixer-enum.h"
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#include "oss4-soundcard.h"
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GST_DEBUG_CATEGORY_EXTERN (oss4mixer_debug);
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#define GST_CAT_DEFAULT oss4mixer_debug
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static GList *gst_oss4_mixer_enum_get_values (GstMixerOptions * options);
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/* GstMixerTrack is a plain GObject, so let's just use the GLib macro here */
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G_DEFINE_TYPE (GstOss4MixerEnum, gst_oss4_mixer_enum, GST_TYPE_MIXER_OPTIONS);
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gst_oss4_mixer_enum_init (GstOss4MixerEnum * e)
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e->need_update = TRUE;
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gst_oss4_mixer_enum_dispose (GObject * obj)
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GstMixerOptions *options = GST_MIXER_OPTIONS (obj);
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/* our list is a flat list with constant strings, but the GstMixerOptions
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* dispose will try to g_free the contained strings, so clean up the list
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* before chaining up to GstMixerOptions */
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g_list_free (options->values);
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options->values = NULL;
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G_OBJECT_CLASS (gst_oss4_mixer_enum_parent_class)->dispose (obj);
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gst_oss4_mixer_enum_class_init (GstOss4MixerEnumClass * klass)
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstMixerOptionsClass *mixeroptions_class = (GstMixerOptionsClass *) klass;
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gobject_class->dispose = gst_oss4_mixer_enum_dispose;
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mixeroptions_class->get_values = gst_oss4_mixer_enum_get_values;
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gst_oss4_mixer_enum_get_values_locked (GstMixerOptions * options)
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GstOss4MixerEnum *e = GST_OSS4_MIXER_ENUM_CAST (options);
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GList *oldlist, *list = NULL;
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/* if current list of values is empty, update/re-check in any case */
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if (!e->need_update && options->values != NULL)
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return options->values;
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GST_LOG_OBJECT (e, "updating available values for %s", e->mc->mixext.extname);
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for (i = 0; i < e->mc->mixext.maxvalue; ++i) {
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s = g_quark_to_string (e->mc->enum_vals[i]);
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if (MIXEXT_ENUM_IS_AVAILABLE (e->mc->mixext, i)) {
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GST_LOG_OBJECT (e, "option '%s' is available", s);
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list = g_list_prepend (list, (gpointer) s);
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GST_LOG_OBJECT (e, "option '%s' is currently not available", s);
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list = g_list_reverse (list);
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/* this is not thread-safe, but then the entire GstMixer API isn't really,
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* since we return foo->list and not a copy and don't take any locks, so
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* not much we can do here but pray; we're usually either called from _new()
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* or from within _get_values() though, so it should be okay. We could use
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* atomic ops here, but I'm not sure how much more that really buys us.*/
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oldlist = options->values; /* keep window small */
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options->values = list;
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g_list_free (oldlist);
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e->need_update = FALSE;
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return options->values;
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gst_oss4_mixer_enum_get_values (GstMixerOptions * options)
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GstOss4MixerEnum *e = GST_OSS4_MIXER_ENUM (options);
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/* we take the lock here mostly to serialise ioctls with the watch thread */
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GST_OBJECT_LOCK (e->mixer);
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list = gst_oss4_mixer_enum_get_values_locked (options);
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GST_OBJECT_UNLOCK (e->mixer);
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gst_oss4_mixer_enum_get_current_value (GstOss4MixerEnum * e)
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const gchar *cur_val = NULL;
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if (e->mc->enum_vals != NULL && e->mc->last_val < e->mc->mixext.maxvalue) {
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cur_val = g_quark_to_string (e->mc->enum_vals[e->mc->last_val]);
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gst_oss4_mixer_enum_update_current (GstOss4MixerEnum * e)
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if (!gst_oss4_mixer_get_control_val (e->mixer, e->mc, &cur))
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if (cur < 0 || cur >= e->mc->mixext.maxvalue) {
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GST_WARNING_OBJECT (e, "read value %d out of bounds [0-%d]", cur,
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e->mc->mixext.maxvalue - 1);
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gst_oss4_mixer_enum_set_option (GstOss4MixerEnum * e, const gchar * value)
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q = g_quark_try_string (value);
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GST_WARNING_OBJECT (e, "unknown option '%s'", value);
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for (i = 0; i < e->mc->mixext.maxvalue; ++i) {
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if (q == e->mc->enum_vals[i])
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if (i >= e->mc->mixext.maxvalue) {
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GST_WARNING_OBJECT (e, "option '%s' is not valid for this control", value);
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GST_LOG_OBJECT (e, "option '%s' = %d", value, i);
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if (!MIXEXT_ENUM_IS_AVAILABLE (e->mc->mixext, i)) {
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GST_WARNING_OBJECT (e, "option '%s' is not selectable currently", value);
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if (!gst_oss4_mixer_set_control_val (e->mixer, e->mc, i)) {
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GST_WARNING_OBJECT (e, "could not set option '%s' (%d)", value, i);
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/* and re-read current value with sanity checks (or could just assign here) */
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gst_oss4_mixer_enum_update_current (e);
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gst_oss4_mixer_enum_get_option (GstOss4MixerEnum * e)
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const gchar *cur_str = NULL;
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if (!gst_oss4_mixer_enum_update_current (e)) {
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GST_WARNING_OBJECT (e, "failed to read current value");
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cur_str = gst_oss4_mixer_enum_get_current_value (e);
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GST_LOG_OBJECT (e, "%s (%d)", GST_STR_NULL (cur_str), e->mc->last_val);
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gst_oss4_mixer_enum_new (GstOss4Mixer * mixer, GstOss4MixerControl * mc)
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GstMixerTrack *track;
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e = g_object_new (GST_TYPE_OSS4_MIXER_ENUM, "untranslated-label",
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mc->mixext.extname, NULL);
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track = GST_MIXER_TRACK (e);
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/* caller will set track->label and track->flags */
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track->num_channels = 0;
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track->min_volume = 0;
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track->max_volume = 0;
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(void) gst_oss4_mixer_enum_get_values_locked (GST_MIXER_OPTIONS (track));
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if (!gst_oss4_mixer_enum_update_current (e)) {
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GST_WARNING_OBJECT (track, "failed to read current value, returning NULL");
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g_object_unref (track);
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GST_LOG_OBJECT (e, "current value: %d (%s)", e->mc->last_val,
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gst_oss4_mixer_enum_get_current_value (e));
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/* This is called from the watch thread */
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gst_oss4_mixer_enum_process_change_unlocked (GstMixerTrack * track)
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GstOss4MixerEnum *e = GST_OSS4_MIXER_ENUM_CAST (track);
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if (!e->mc->changed && !e->mc->list_changed)
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if (e->mc->list_changed) {
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gst_mixer_options_list_changed (GST_MIXER (e->mixer),
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GST_MIXER_OPTIONS (e));
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GST_OBJECT_LOCK (e->mixer);
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cur = (gchar *) gst_oss4_mixer_enum_get_current_value (e);
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GST_OBJECT_UNLOCK (e->mixer);
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gst_mixer_option_changed (GST_MIXER (e->mixer), GST_MIXER_OPTIONS (e), cur);
added
removed
sys/oss4/oss4-mixer-enum.c
