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408 lines
12 KiB
C
408 lines
12 KiB
C
/* ALSA mixer implementation.
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* Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
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*
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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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*
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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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*
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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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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstalsamixer.h"
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/* elementfactory information */
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static GstElementDetails gst_alsa_mixer_details = GST_ELEMENT_DETAILS (
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"Alsa Mixer",
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"Generic/Audio",
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"Control sound input and output levels with ALSA",
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"Leif Johnson <leif@ambient.2y.net>"
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);
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static void gst_alsa_interface_init (GstImplementsInterfaceClass *klass);
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static void gst_alsa_mixer_class_init (gpointer g_class,
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gpointer class_data);
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static void gst_alsa_mixer_init (GstAlsaMixer * mixer);
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static void gst_alsa_mixer_dispose (GObject * object);
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static void gst_alsa_mixer_interface_init (GstMixerClass* klass);
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static gboolean gst_alsa_mixer_supported (GstImplementsInterface * iface,
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GType iface_type);
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/* GStreamer stuff */
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static GstElementStateReturn gst_alsa_mixer_change_state (GstElement * element);
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static void gst_alsa_mixer_build_list (GstAlsaMixer * mixer);
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static void gst_alsa_mixer_free_list (GstAlsaMixer * mixer);
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/* interface implementation */
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static const GList * gst_alsa_mixer_list_tracks (GstMixer * mixer);
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static void gst_alsa_mixer_set_volume (GstMixer * mixer,
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GstMixerTrack* track,
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gint * volumes);
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static void gst_alsa_mixer_get_volume (GstMixer * mixer,
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GstMixerTrack* track,
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gint * volumes);
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static void gst_alsa_mixer_set_record (GstMixer * mixer,
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GstMixerTrack* track,
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gboolean record);
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static void gst_alsa_mixer_set_mute (GstMixer * mixer,
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GstMixerTrack* track,
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gboolean mute);
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/*** GOBJECT STUFF ************************************************************/
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static GstAlsa *parent_class = NULL;
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GType
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gst_alsa_mixer_get_type (void)
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{
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static GType alsa_mixer_type = 0;
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if (!alsa_mixer_type) {
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static const GTypeInfo alsa_mixer_info = {
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sizeof (GstAlsaMixerClass),
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NULL,
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NULL,
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gst_alsa_mixer_class_init,
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NULL,
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NULL,
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sizeof (GstAlsaMixer),
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0,
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(GInstanceInitFunc) gst_alsa_mixer_init,
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};
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static const GInterfaceInfo alsa_iface_info = {
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(GInterfaceInitFunc) gst_alsa_interface_init,
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NULL,
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NULL,
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};
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static const GInterfaceInfo alsa_mixer_iface_info = {
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(GInterfaceInitFunc) gst_alsa_mixer_interface_init,
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NULL,
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NULL,
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};
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alsa_mixer_type = g_type_register_static (GST_TYPE_ALSA, "GstAlsaMixer", &alsa_mixer_info, 0);
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g_type_add_interface_static (alsa_mixer_type, GST_TYPE_IMPLEMENTS_INTERFACE, &alsa_iface_info);
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g_type_add_interface_static (alsa_mixer_type, GST_TYPE_MIXER, &alsa_mixer_iface_info);
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}
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return alsa_mixer_type;
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}
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static void
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gst_alsa_mixer_class_init (gpointer g_class, gpointer class_data)
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{
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GObjectClass *object_class;
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GstElementClass *element_class;
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GstAlsaClass *klass;
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klass = (GstAlsaClass *)g_class;
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object_class = (GObjectClass *) g_class;
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element_class = (GstElementClass *) g_class;
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if (parent_class == NULL)
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parent_class = g_type_class_ref (GST_TYPE_ALSA);
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object_class->dispose = gst_alsa_mixer_dispose;
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element_class->change_state = gst_alsa_mixer_change_state;
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gst_element_class_set_details (element_class, &gst_alsa_mixer_details);
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}
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static void
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gst_alsa_mixer_init (GstAlsaMixer * mixer)
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{
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gint err;
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GstAlsa *alsa = GST_ALSA (mixer);
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mixer->mixer_handle = (snd_mixer_t *) -1;
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/* open and initialize the mixer device */
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err = snd_mixer_open(&mixer->mixer_handle, 0);
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if (err < 0 || mixer->mixer_handle == NULL) {
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GST_ERROR_OBJECT (GST_OBJECT (mixer), "Cannot open mixer device.");
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mixer->mixer_handle = (snd_mixer_t *) -1;
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return;
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}
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if ((err = snd_mixer_attach(mixer->mixer_handle, alsa->device)) < 0) {
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GST_ERROR_OBJECT (GST_OBJECT (mixer),
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"Cannot attach mixer to sound device `%s'.",
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alsa->device);
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goto error;
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}
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if ((err = snd_mixer_selem_register(mixer->mixer_handle, NULL, NULL)) < 0) {
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GST_ERROR_OBJECT (GST_OBJECT (mixer), "Cannot register mixer elements.");
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goto error;
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}
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if ((err = snd_mixer_load(mixer->mixer_handle)) < 0) {
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GST_ERROR_OBJECT (GST_OBJECT (mixer), "Cannot load mixer settings.");
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goto error;
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}
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return;
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error:
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snd_mixer_close (mixer->mixer_handle);
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mixer->mixer_handle = (snd_mixer_t *) -1;
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}
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static void
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gst_alsa_mixer_dispose (GObject * object)
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{
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GstAlsaMixer *mixer = GST_ALSA_MIXER (object);
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if (((gint) mixer->mixer_handle) == -1) return;
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snd_mixer_close (mixer->mixer_handle);
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mixer->mixer_handle = (snd_mixer_t *) -1;
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_alsa_interface_init (GstImplementsInterfaceClass *klass)
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{
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klass->supported = gst_alsa_mixer_supported;
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}
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static void
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gst_alsa_mixer_interface_init (GstMixerClass *klass)
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{
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GST_MIXER_TYPE (klass) = GST_MIXER_HARDWARE;
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/* set up the interface hooks */
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klass->list_tracks = gst_alsa_mixer_list_tracks;
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klass->set_volume = gst_alsa_mixer_set_volume;
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klass->get_volume = gst_alsa_mixer_get_volume;
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klass->set_mute = gst_alsa_mixer_set_mute;
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klass->set_record = gst_alsa_mixer_set_record;
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}
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gboolean
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gst_alsa_mixer_supported (GstImplementsInterface *iface, GType iface_type)
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{
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g_assert (iface_type == GST_TYPE_MIXER);
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return (((gint) GST_ALSA_MIXER (iface)->mixer_handle) != -1);
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}
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static void
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gst_alsa_mixer_build_list (GstAlsaMixer *mixer)
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{
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gint i, count;
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snd_mixer_elem_t *element;
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GstMixerTrack *track;
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g_return_if_fail (((gint) mixer->mixer_handle) != -1);
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count = snd_mixer_get_count(mixer->mixer_handle);
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element = snd_mixer_first_elem(mixer->mixer_handle);
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/* build track list */
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for (i = 0; i < count; i++) {
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gint channels = 0;
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if (! snd_mixer_selem_is_active(element)) continue;
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/* find out if this element can be an input */
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if (snd_mixer_selem_has_capture_channel(element, 0) ||
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snd_mixer_selem_has_capture_switch(element) ||
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snd_mixer_selem_is_capture_mono(element)) {
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while (snd_mixer_selem_has_capture_channel(element, channels))
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channels++;
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track = gst_alsa_mixer_track_new
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(element, i, channels, GST_MIXER_TRACK_INPUT);
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mixer->tracklist = g_list_append (mixer->tracklist, track);
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}
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/* find out if this element can also be an output */
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channels = 0;
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if (snd_mixer_selem_has_playback_channel(element, 0) ||
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snd_mixer_selem_has_playback_switch(element) ||
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snd_mixer_selem_is_playback_mono(element)) {
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while (snd_mixer_selem_has_playback_channel(element, channels))
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channels++;
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track = gst_alsa_mixer_track_new
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(element, i, channels, GST_MIXER_TRACK_OUTPUT);
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mixer->tracklist = g_list_append (mixer->tracklist, track);
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}
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element = snd_mixer_elem_next(element);
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}
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}
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static void
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gst_alsa_mixer_free_list (GstAlsaMixer *mixer)
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{
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g_return_if_fail (((gint) mixer->mixer_handle) != -1);
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g_list_foreach (mixer->tracklist, (GFunc) gst_alsa_mixer_track_free, NULL);
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g_list_free (mixer->tracklist);
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mixer->tracklist = NULL;
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}
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/*** GSTREAMER FUNCTIONS ******************************************************/
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static GstElementStateReturn
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gst_alsa_mixer_change_state (GstElement *element)
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{
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GstAlsaMixer *this;
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g_return_val_if_fail (element != NULL, FALSE);
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this = GST_ALSA_MIXER (element);
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switch (GST_STATE_TRANSITION (element)) {
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case GST_STATE_NULL_TO_READY:
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gst_alsa_mixer_build_list (this); break;
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case GST_STATE_READY_TO_NULL:
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gst_alsa_mixer_free_list (this); break;
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default:
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g_assert_not_reached();
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}
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if (GST_ELEMENT_CLASS (parent_class)->change_state)
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return GST_ELEMENT_CLASS (parent_class)->change_state (element);
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return GST_STATE_SUCCESS;
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}
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/*** INTERFACE IMPLEMENTATION *************************************************/
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static const GList *
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gst_alsa_mixer_list_tracks (GstMixer *mixer)
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{
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GstAlsaMixer *alsa_mixer = GST_ALSA_MIXER (mixer);
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g_return_val_if_fail (((gint) alsa_mixer->mixer_handle) != -1, NULL);
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return (const GList *) alsa_mixer->tracklist;
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}
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static void
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gst_alsa_mixer_get_volume (GstMixer *mixer,
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GstMixerTrack *track,
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gint *volumes)
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{
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gint i;
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GstAlsaMixer *alsa_mixer = GST_ALSA_MIXER (mixer);
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GstAlsaMixerTrack *alsa_track = (GstAlsaMixerTrack *) track;
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g_return_if_fail (((gint) alsa_mixer->mixer_handle) != -1);
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if (track->flags & GST_MIXER_TRACK_MUTE) {
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for (i = 0; i < track->num_channels; i++)
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volumes[i] = alsa_track->volumes[i];
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} else {
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for (i = 0; i < track->num_channels; i++) {
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long tmp;
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if (snd_mixer_selem_has_playback_channel(alsa_track->element, i)) {
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snd_mixer_selem_get_playback_volume(alsa_track->element, i, &tmp);
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volumes[i] = (gint) tmp;
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} else if (snd_mixer_selem_has_capture_channel(alsa_track->element, i)) {
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snd_mixer_selem_get_capture_volume(alsa_track->element, i, &tmp);
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volumes[i] = (gint) tmp;
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}
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}
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}
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}
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static void
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gst_alsa_mixer_set_volume (GstMixer *mixer,
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GstMixerTrack *track,
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gint *volumes)
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{
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gint i;
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GstAlsaMixer *alsa_mixer = GST_ALSA_MIXER (mixer);
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GstAlsaMixerTrack *alsa_track = (GstAlsaMixerTrack *) track;
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g_return_if_fail (((gint) alsa_mixer->mixer_handle) != -1);
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/* only set the volume with ALSA lib if the track isn't muted. */
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if (! (track->flags & GST_MIXER_TRACK_MUTE)) {
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for (i = 0; i < track->num_channels; i++) {
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if (snd_mixer_selem_has_playback_channel(alsa_track->element, i))
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snd_mixer_selem_set_playback_volume(alsa_track->element, i, (long) volumes[i]);
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else if (snd_mixer_selem_has_capture_channel(alsa_track->element, i))
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snd_mixer_selem_set_capture_volume(alsa_track->element, i, (long) volumes[i]);
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}
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}
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for (i = 0; i < track->num_channels; i++)
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alsa_track->volumes[i] = volumes[i];
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}
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static void
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gst_alsa_mixer_set_mute (GstMixer *mixer,
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GstMixerTrack *track,
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gboolean mute)
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{
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gint i;
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GstAlsaMixer *alsa_mixer = GST_ALSA_MIXER (mixer);
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GstAlsaMixerTrack *alsa_track = (GstAlsaMixerTrack *) track;
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g_return_if_fail (((gint) alsa_mixer->mixer_handle) != -1);
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if (mute) {
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track->flags |= GST_MIXER_TRACK_MUTE;
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for (i = 0; i < track->num_channels; i++) {
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if (snd_mixer_selem_has_capture_channel(alsa_track->element, i))
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snd_mixer_selem_set_capture_volume(alsa_track->element, i, 0);
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else if (snd_mixer_selem_has_playback_channel(alsa_track->element, i))
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snd_mixer_selem_set_playback_volume(alsa_track->element, i, 0);
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}
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} else {
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track->flags &= ~GST_MIXER_TRACK_MUTE;
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for (i = 0; i < track->num_channels; i++) {
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if (snd_mixer_selem_has_capture_channel(alsa_track->element, i))
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snd_mixer_selem_set_capture_volume(alsa_track->element, i,
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alsa_track->volumes[i]);
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else if (snd_mixer_selem_has_playback_channel(alsa_track->element, i))
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snd_mixer_selem_set_playback_volume(alsa_track->element, i,
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alsa_track->volumes[i]);
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}
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}
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}
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static void
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gst_alsa_mixer_set_record (GstMixer *mixer,
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GstMixerTrack *track,
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gboolean record)
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{
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GstAlsaMixer *alsa_mixer = GST_ALSA_MIXER (mixer);
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g_return_if_fail (((gint) alsa_mixer->mixer_handle) != -1);
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if (record) {
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track->flags |= GST_MIXER_TRACK_RECORD;
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} else {
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track->flags &= ~GST_MIXER_TRACK_RECORD;
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}
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}
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