diff -r 000000000000 -r 0e761a78d257 gst_plugins_base/ext/alsa/gstalsamixertrack.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/ext/alsa/gstalsamixertrack.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,339 @@
+/* ALSA mixer track 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst-i18n-plugin.h>
+
+#include "gstalsamixertrack.h"
+
+static void gst_alsa_mixer_track_init (GstAlsaMixerTrack * alsa_track);
+static void gst_alsa_mixer_track_class_init (gpointer g_class,
+    gpointer class_data);
+
+static GstMixerTrackClass *parent_class = NULL;
+
+GType
+gst_alsa_mixer_track_get_type (void)
+{
+  static GType track_type = 0;
+
+  if (!track_type) {
+    static const GTypeInfo track_info = {
+      sizeof (GstAlsaMixerTrackClass),
+      NULL,
+      NULL,
+      gst_alsa_mixer_track_class_init,
+      NULL,
+      NULL,
+      sizeof (GstAlsaMixerTrack),
+      0,
+      (GInstanceInitFunc) gst_alsa_mixer_track_init,
+      NULL
+    };
+
+    track_type =
+        g_type_register_static (GST_TYPE_MIXER_TRACK, "GstAlsaMixerTrack",
+        &track_info, 0);
+  }
+
+  return track_type;
+}
+
+static void
+gst_alsa_mixer_track_class_init (gpointer g_class, gpointer class_data)
+{
+  parent_class = g_type_class_peek_parent (g_class);
+}
+
+static void
+gst_alsa_mixer_track_init (GstAlsaMixerTrack * alsa_track)
+{
+}
+
+static void
+gst_alsa_mixer_track_update_alsa_capabilities (GstAlsaMixerTrack * alsa_track)
+{
+  alsa_track->alsa_flags = 0;
+  alsa_track->capture_group = -1;
+
+  if (snd_mixer_selem_has_common_volume (alsa_track->element))
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_VOLUME;
+
+  if (snd_mixer_selem_has_playback_volume (alsa_track->element))
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_PVOLUME;
+
+  if (snd_mixer_selem_has_capture_volume (alsa_track->element))
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CVOLUME;
+
+  if (snd_mixer_selem_has_common_switch (alsa_track->element))
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_SWITCH;
+
+  if (snd_mixer_selem_has_playback_switch (alsa_track->element))
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_PSWITCH;
+
+  if (snd_mixer_selem_has_capture_switch (alsa_track->element)) {
+    alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CSWITCH;
+
+    if (snd_mixer_selem_has_capture_switch_exclusive (alsa_track->element)) {
+      alsa_track->alsa_flags |= GST_ALSA_MIXER_TRACK_CSWITCH_EXCL;
+      alsa_track->capture_group =
+          snd_mixer_selem_get_capture_group (alsa_track->element);
+    }
+  }
+
+  GST_LOG ("[%s] alsa_flags=0x%08x, capture_group=%d",
+      snd_mixer_selem_get_name (alsa_track->element),
+      alsa_track->alsa_flags, alsa_track->capture_group);
+}
+
+inline static gboolean
+alsa_track_has_cap (GstAlsaMixerTrack * alsa_track, guint32 flag)
+{
+  return ((alsa_track->alsa_flags & flag) != 0);
+}
+
+GstMixerTrack *
+gst_alsa_mixer_track_new (snd_mixer_elem_t * element,
+    gint num, gint track_num, gint flags, gboolean sw,
+    GstAlsaMixerTrack * shared_mute_track, gboolean append_capture)
+{
+  GstAlsaMixerTrack *alsa_track;
+  GstMixerTrack *track;
+  const gchar *name;
+  const gchar *label;
+  gint i;
+  long min = 0, max = 0;
+  const struct
+  {
+    const gchar orig[12];
+    const gchar trans[12];
+  } alsa_track_labels[] = {
+    {
+    "Master", N_("Master")}, {
+    "Bass", N_("Bass")}, {
+    "Treble", N_("Treble")}, {
+    "PCM", N_("PCM")}, {
+    "Synth", N_("Synth")}, {
+    "Line", N_("Line-in")}, {
+    "CD", N_("CD")}, {
+    "Mic", N_("Microphone")}, {
+    "PC Speaker", N_("PC Speaker")}, {
+    "Playback", N_("Playback")}, {
+    "Capture", N_("Capture")}
+  };
+
+  name = snd_mixer_selem_get_name (element);
+
+  GST_LOG ("[%s] num=%d,track_num=%d,flags=0x%08x,sw=%s,shared_mute_track=%p",
+      name, num, track_num, flags, (sw) ? "true" : "false", shared_mute_track);
+
+  track = (GstMixerTrack *) g_object_new (GST_ALSA_MIXER_TRACK_TYPE,
+      "untranslated-label", name, NULL);
+
+  alsa_track = (GstAlsaMixerTrack *) track;
+
+  GST_LOG ("[%s] created new mixer track %p", name, track);
+
+  /* This reflects the assumptions used for GstAlsaMixerTrack */
+  if (!(!!(flags & GST_MIXER_TRACK_OUTPUT) ^ !!(flags & GST_MIXER_TRACK_INPUT))) {
+    GST_ERROR ("Mixer track must be either output or input!");
+    g_return_val_if_reached (NULL);
+  }
+
+  track->flags = flags;
+  alsa_track->element = element;
+  alsa_track->shared_mute = shared_mute_track;
+  alsa_track->track_num = track_num;
+  alsa_track->alsa_channels = 0;
+
+  gst_alsa_mixer_track_update_alsa_capabilities (alsa_track);
+
+  if (flags & GST_MIXER_TRACK_OUTPUT) {
+    while (alsa_track->alsa_channels < GST_ALSA_MAX_CHANNELS &&
+        snd_mixer_selem_has_playback_channel (element,
+            alsa_track->alsa_channels)) {
+      alsa_track->alsa_channels++;
+    }
+    GST_LOG ("[%s] %d output channels", name, alsa_track->alsa_channels);
+  } else if (flags & GST_MIXER_TRACK_INPUT) {
+    while (alsa_track->alsa_channels < GST_ALSA_MAX_CHANNELS &&
+        snd_mixer_selem_has_capture_channel (element,
+            alsa_track->alsa_channels)) {
+      alsa_track->alsa_channels++;
+    }
+    GST_LOG ("[%s] %d input channels", name, alsa_track->alsa_channels);
+  } else {
+    g_assert_not_reached ();
+  }
+
+  if (sw)
+    track->num_channels = 0;
+  else
+    track->num_channels = alsa_track->alsa_channels;
+
+  /* translate the name if we can */
+  label = name;
+  for (i = 0; i < G_N_ELEMENTS (alsa_track_labels); ++i) {
+    if (g_utf8_collate (label, alsa_track_labels[i].orig) == 0) {
+      label = _(alsa_track_labels[i].trans);
+      break;
+    }
+  }
+
+  if (num == 0) {
+    track->label = g_strdup_printf ("%s%s%s", label,
+        append_capture ? " " : "", append_capture ? _("Capture") : "");
+  } else {
+    track->label = g_strdup_printf ("%s%s%s %d", label,
+        append_capture ? " " : "", append_capture ? _("Capture") : "", num);
+  }
+
+  /* set volume information */
+  if (track->num_channels > 0) {
+    if ((flags & GST_MIXER_TRACK_OUTPUT))
+      snd_mixer_selem_get_playback_volume_range (element, &min, &max);
+    else
+      snd_mixer_selem_get_capture_volume_range (element, &min, &max);
+  }
+  track->min_volume = (gint) min;
+  track->max_volume = (gint) max;
+
+  for (i = 0; i < track->num_channels; i++) {
+    long tmp = 0;
+
+    if (flags & GST_MIXER_TRACK_OUTPUT)
+      snd_mixer_selem_get_playback_volume (element, i, &tmp);
+    else
+      snd_mixer_selem_get_capture_volume (element, i, &tmp);
+
+    alsa_track->volumes[i] = (gint) tmp;
+  }
+
+  gst_alsa_mixer_track_update (alsa_track);
+
+  return track;
+}
+
+void
+gst_alsa_mixer_track_update (GstAlsaMixerTrack * alsa_track)
+{
+  GstMixerTrack *track = (GstMixerTrack *) alsa_track;
+  gint i;
+  gint audible = !(track->flags & GST_MIXER_TRACK_MUTE);
+
+  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PVOLUME)) {
+    /* update playback volume */
+    for (i = 0; i < track->num_channels; i++) {
+      long vol = 0;
+
+      snd_mixer_selem_get_playback_volume (alsa_track->element, i, &vol);
+      alsa_track->volumes[i] = (gint) vol;
+    }
+  }
+
+  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CVOLUME)) {
+    /* update capture volume */
+    for (i = 0; i < track->num_channels; i++) {
+      long vol = 0;
+
+      snd_mixer_selem_get_capture_volume (alsa_track->element, i, &vol);
+      alsa_track->volumes[i] = (gint) vol;
+    }
+  }
+
+  /* Any updates in flags? */
+  if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PSWITCH)) {
+    int v = 0;
+
+    audible = 0;
+    for (i = 0; i < alsa_track->alsa_channels; ++i) {
+      snd_mixer_selem_get_playback_switch (alsa_track->element, i, &v);
+      audible += v;
+    }
+
+  } else if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_PVOLUME) &&
+      track->flags & GST_MIXER_TRACK_MUTE) {
+    /* check if user has raised volume with a parallel running application */
+
+    for (i = 0; i < track->num_channels; i++) {
+      long vol = 0;
+
+      snd_mixer_selem_get_playback_volume (alsa_track->element, i, &vol);
+
+      if (vol > track->min_volume) {
+        audible = 1;
+        break;
+      }
+    }
+  }
+
+  if (!!(audible) != !(track->flags & GST_MIXER_TRACK_MUTE)) {
+    if (audible) {
+      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 (track->flags & GST_MIXER_TRACK_INPUT) {
+    gint recording = track->flags & GST_MIXER_TRACK_RECORD;
+
+    if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CSWITCH)) {
+      int v = 0;
+
+      recording = 0;
+      for (i = 0; i < alsa_track->alsa_channels; ++i) {
+        snd_mixer_selem_get_capture_switch (alsa_track->element, i, &v);
+        recording += v;
+      }
+
+    } else if (alsa_track_has_cap (alsa_track, GST_ALSA_MIXER_TRACK_CVOLUME) &&
+        !(track->flags & GST_MIXER_TRACK_RECORD)) {
+      /* check if user has raised volume with a parallel running application */
+
+      for (i = 0; i < track->num_channels; i++) {
+        long vol = 0;
+
+        snd_mixer_selem_get_capture_volume (alsa_track->element, i, &vol);
+
+        if (vol > track->min_volume) {
+          recording = 1;
+          break;
+        }
+      }
+    }
+
+    if (recording)
+      track->flags |= GST_MIXER_TRACK_RECORD;
+    else
+      track->flags &= ~GST_MIXER_TRACK_RECORD;
+  }
+
+}