moved from Mate-Extra

1 files changed, 552 insertions, 0 deletions

diff --git a/gst-mixer/src/volume.c b/gst-mixer/src/volume.c
new file mode 100644
index 0000000..a3386f1
--- /dev/null
+++ b/gst-mixer/src/volume.c
@@ -0,0 +1,552 @@
+/* MATE Volume Control
+ * Copyright (C) 2003-2004 Ronald Bultje <[email protected]>
+ *
+ * volume.c: representation of a track's volume channels
+ *
+ * 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
+
+#define _ISOC99_SOURCE
+
+#include <math.h>
+#include <glib/gi18n.h>
+#include <gdk/gdkx.h>
+#include <gtk/gtk.h>
+
+#include "volume.h"
+#include "button.h"
+
+G_DEFINE_TYPE (MateVolumeControlVolume, mate_volume_control_volume, GTK_TYPE_FIXED)
+
+
+static void	mate_volume_control_volume_class_init	(MateVolumeControlVolumeClass *klass);
+static void	mate_volume_control_volume_init	(MateVolumeControlVolume *el);
+static void	mate_volume_control_volume_dispose	(GObject   *object);
+
+static void	mate_volume_control_volume_size_req	(GtkWidget *widget,
+							 GtkRequisition *req);
+static void	mate_volume_control_volume_size_alloc	(GtkWidget *widget,
+							 GtkAllocation *alloc);
+static gboolean	mate_volume_control_volume_expose	(GtkWidget *widget,
+							 GdkEventExpose *expose);
+
+static void	cb_volume_changed			(GtkAdjustment *adj,
+							 gpointer   data);
+static void	cb_lock_toggled				(GtkToggleButton *button,
+							 gpointer   data);
+
+static gboolean	cb_check				(gpointer   data);
+
+
+static void
+mate_volume_control_volume_class_init (MateVolumeControlVolumeClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *gtkwidget_class = GTK_WIDGET_CLASS (klass);
+
+  gobject_class->dispose = mate_volume_control_volume_dispose;
+  gtkwidget_class->size_allocate = mate_volume_control_volume_size_alloc;
+  gtkwidget_class->size_request = mate_volume_control_volume_size_req;
+  gtkwidget_class->expose_event = mate_volume_control_volume_expose;
+}
+
+static void
+mate_volume_control_volume_init (MateVolumeControlVolume *vol)
+{
+  #if GTK_CHECK_VERSION(2,18,0)
+  gtk_widget_set_has_window (GTK_WIDGET (vol), TRUE);
+  #else
+  gtk_fixed_set_has_window (GTK_FIXED (vol), TRUE);
+  #endif
+
+  vol->mixer = NULL;
+  vol->track = NULL;
+  vol->padding = 6;
+  vol->scales = NULL;
+  vol->button = NULL;
+  vol->locked = FALSE;
+  vol->id = 0;
+}
+
+static GtkWidget *
+get_scale (MateVolumeControlVolume *vol,
+	   gint num_chan,
+	   gint volume)
+{
+  GtkWidget *slider;
+  GtkObject *adj;
+  AtkObject *accessible;
+  gchar *accessible_name;
+
+  adj = gtk_adjustment_new (volume,
+		vol->track->min_volume, vol->track->max_volume,
+		(vol->track->max_volume - vol->track->min_volume) / 100.0,
+		(vol->track->max_volume - vol->track->min_volume) / 10.0, 0.0);
+  g_signal_connect (adj, "value_changed",
+		    G_CALLBACK (cb_volume_changed), vol);
+  slider = gtk_vscale_new (GTK_ADJUSTMENT (adj));
+  gtk_scale_set_draw_value (GTK_SCALE (slider), FALSE);
+  gtk_range_set_inverted (GTK_RANGE (slider), TRUE);
+
+  /* a11y */
+  accessible = gtk_widget_get_accessible (slider);
+  if (GTK_IS_ACCESSIBLE (accessible)) {
+    if (vol->track->num_channels == 1) {
+      accessible_name = g_strdup_printf (_("Track %s"),
+					 vol->track->label);
+    } else {
+      gchar *accessible_desc = g_strdup_printf (_("Channel %d of track %s"),
+						num_chan + 1,
+						vol->track->label);
+      accessible_name = g_strdup_printf (_("Track %s, channel %d"),
+					 vol->track->label, num_chan + 1);
+      atk_object_set_description (accessible, accessible_desc); 
+      g_free (accessible_desc);
+    }
+    atk_object_set_name (accessible, accessible_name);
+    g_free (accessible_name);
+  }
+
+  return slider;
+}
+
+static void
+get_button (MateVolumeControlVolume *vol,
+	    gint *volumes)
+{
+  AtkObject *accessible;
+  gchar *accessible_name, *msg;
+  gint n;
+
+  msg = g_strdup_printf (_("Lock channels for %s together"), vol->track->label);
+  vol->button = mate_volume_control_button_new ("chain.png",
+						 "chain-broken.png",
+						 msg);
+  g_free (msg);
+  g_signal_connect (vol->button, "clicked",
+		    G_CALLBACK (cb_lock_toggled), vol);
+  for (n = 1; n < vol->track->num_channels; n++) {
+    /* default, unlocked */
+    if (volumes[n] != volumes[0])
+      break;
+  }
+  mate_volume_control_button_set_active (MATE_VOLUME_CONTROL_BUTTON (vol->button),
+					  n == vol->track->num_channels);
+
+  /* a11y */
+  accessible = gtk_widget_get_accessible (vol->button);
+  if (GTK_IS_ACCESSIBLE (accessible)) {
+    accessible_name = g_strdup_printf (_("Track %s: lock channels together"),
+				       vol->track->label);
+    atk_object_set_name (accessible, accessible_name);
+    g_free (accessible_name);
+  }
+}
+
+GtkWidget *
+mate_volume_control_volume_new (GstMixer *mixer,
+				 GstMixerTrack *track,
+				 gint      padding)
+{
+  MateVolumeControlVolume *vol;
+  gint *volumes, n;
+  gchar *msg, *chan;
+  gboolean need_timeout = TRUE;
+
+  need_timeout = ((gst_mixer_get_mixer_flags (GST_MIXER (mixer)) &
+		   GST_MIXER_FLAG_AUTO_NOTIFICATIONS) == 0);
+
+  /* volume */
+  vol = g_object_new (MATE_VOLUME_CONTROL_TYPE_VOLUME, NULL);
+  gst_object_ref (GST_OBJECT (mixer));
+  vol->mixer = mixer;
+  vol->track = g_object_ref (G_OBJECT (track));
+  if (padding >= 0)
+    vol->padding = padding;
+
+  /* sliders */
+  volumes = g_new0 (gint, track->num_channels);
+  gst_mixer_get_volume (mixer, track, volumes);
+  for (n = 0; n < track->num_channels; n++) {
+    GtkWidget *slider;
+
+    /* we will reposition the widget once we're drawing up */
+    slider = get_scale (vol, n, volumes[n]);
+    gtk_fixed_put (GTK_FIXED (vol), slider, 0, 0);
+    gtk_widget_show (slider);
+    vol->scales = g_list_append (vol->scales, slider);
+
+    /* somewhat dirty hack that will suffice for now. 1 chan
+     * means mono, two means stereo (left/right) and > 2 means
+     * alsa, where channel order is front, rear, center, lfe,
+     * side. */
+    if (vol->track->num_channels == 1) {
+        chan = _("mono");
+    } else if (vol->track->num_channels == 2) {
+        chan = (n == 0) ? _("left") : _("right");
+    } else {
+        switch (n) {
+            case 0:  chan = _("front left"); break;
+            case 1:  chan = _("front right"); break;
+            case 2:  chan = _("rear left"); break;
+            case 3:  chan = _("rear right"); break;
+            case 4:  chan = _("front center"); break;
+            /* Translators: This is the name of a surround sound channel. It
+             * stands for "Low-Frequency Effects". If you're not sure that
+             * this has an established and different translation in your
+             * language, leave it unchanged. */
+            case 5:  chan = _("LFE"); break;
+            case 6:  chan = _("side left"); break;
+            case 7:  chan = _("side right"); break;
+            default: chan = _("unknown"); break;
+        }
+    }
+
+    /* Here, we can actually tell people that this
+     * is a slider that will change channel X. */
+    msg = g_strdup_printf (_("Volume of %s channel on %s"),
+            chan, vol->track->label);
+    gtk_widget_set_tooltip_text (slider, msg);
+    g_free (msg);
+  }
+
+  /* chainbutton */
+  get_button (vol, volumes);
+  if (track->num_channels > 1) {
+    gtk_fixed_put (GTK_FIXED (vol), vol->button, 0, 0);
+    gtk_widget_show (vol->button);
+  }
+
+  g_free (volumes);
+
+  /* GStreamer signals */
+  if (need_timeout)
+    vol->id = g_timeout_add (100, cb_check, vol);
+
+  return GTK_WIDGET (vol);
+}
+
+static void
+mate_volume_control_volume_dispose (GObject *object)
+{
+  MateVolumeControlVolume *vol = MATE_VOLUME_CONTROL_VOLUME (object);
+
+  if (vol->id != 0) {
+    g_source_remove (vol->id);
+    vol->id = 0;
+  }
+
+  if (vol->track) {
+    g_object_unref (G_OBJECT (vol->track));
+    vol->track = NULL;
+  }
+
+  if (vol->mixer) {
+    gst_object_unref (GST_OBJECT (vol->mixer));
+    vol->mixer = NULL;
+  }
+
+  if (vol->scales) {
+    g_list_free (vol->scales);
+    vol->scales = NULL;
+  }
+
+  G_OBJECT_CLASS (mate_volume_control_volume_parent_class)->dispose (object);
+}
+
+/*
+ * Gtk/GDK virtual functions for size negotiation.
+ */
+
+static void
+mate_volume_control_volume_size_req (GtkWidget *widget,
+				      GtkRequisition *req)
+{
+  MateVolumeControlVolume *vol = MATE_VOLUME_CONTROL_VOLUME (widget);
+  GtkRequisition but_req, scale_req;
+
+  /* request size of kids */
+  GTK_WIDGET_GET_CLASS (vol->button)->size_request (vol->button, &but_req);
+  GTK_WIDGET_GET_CLASS (vol->scales->data)->size_request (vol->scales->data,
+							  &scale_req);
+  if (scale_req.height < 100)
+    scale_req.height = 100;
+
+  /* calculate our own size from that */
+  req->width = scale_req.width * vol->track->num_channels +
+      vol->padding * (vol->track->num_channels - 1);
+  req->height = scale_req.height + but_req.height /*+ vol->padding*/;
+}
+
+static void
+mate_volume_control_volume_size_alloc (GtkWidget *widget,
+					GtkAllocation *alloc)
+{
+  MateVolumeControlVolume *vol = MATE_VOLUME_CONTROL_VOLUME (widget);
+  GtkRequisition but_req, scale_req;
+  GtkAllocation but_all, scale_all;
+  gint x_offset, but_deco_width, n = 0;
+  GList *scales;
+  GtkAllocation allocation;
+
+  /* loop? */
+  gtk_widget_get_allocation (widget, &allocation);
+  if (alloc->x == allocation.x &&
+      alloc->y == allocation.y &&
+      alloc->width == allocation.width &&
+      alloc->height == allocation.height)
+    return;
+
+  /* request size of kids */
+  GTK_WIDGET_GET_CLASS (vol->button)->size_request (vol->button, &but_req);
+  GTK_WIDGET_GET_CLASS (vol->scales->data)->size_request (vol->scales->data,
+							  &scale_req);
+
+  /* calculate */
+  x_offset = (alloc->width - ((vol->track->num_channels * scale_req.width) +
+      (vol->track->num_channels - 1) * vol->padding)) / 2;
+  scale_all.width = scale_req.width;
+  scale_all.height = alloc->height - but_req.height;
+  scale_all.y = 0;
+  but_deco_width = alloc->width - (2 * x_offset);
+  but_all.width = but_req.width;
+  but_all.height = but_req.height;
+  but_all.x = x_offset + (but_deco_width - but_req.width) / 2;
+  but_all.y = alloc->height - but_req.height;
+
+  /* tell sliders */
+  for (scales = vol->scales; scales != NULL; scales = scales->next, n++) {
+    scale_all.x = x_offset + n * (scale_req.width + vol->padding);
+    gtk_fixed_move (GTK_FIXED (vol), scales->data, scale_all.x, scale_all.y);
+    gtk_widget_set_size_request (scales->data, scale_all.width, scale_all.height);
+  }
+
+  /* tell button */
+  if (vol->track->num_channels > 1) {
+    gtk_fixed_move (GTK_FIXED (vol), vol->button, but_all.x, but_all.y);
+    gtk_widget_set_size_request (vol->button, but_all.width, but_all.height);
+  }
+
+  /* parent will resize window */
+  GTK_WIDGET_CLASS (mate_volume_control_volume_parent_class)->size_allocate (widget, alloc);
+}
+
+static gboolean
+mate_volume_control_volume_expose (GtkWidget *widget,
+				    GdkEventExpose *expose)
+{
+  GtkAllocation allocation;
+  MateVolumeControlVolume *vol = MATE_VOLUME_CONTROL_VOLUME (widget);
+
+  /* clear background */
+  gtk_widget_get_allocation (widget, &allocation);
+  gdk_window_clear_area (gtk_widget_get_window (widget), 0, 0,
+			 allocation.width,
+			 allocation.height);
+
+  if (vol->track->num_channels > 1) {
+    gint x_offset, y_offset, height, width;
+    GtkRequisition scale_req, but_req;
+    GdkPoint points[3];
+    GtkStyle *style;
+    GtkStateType state;
+
+    /* request size of kids */
+    GTK_WIDGET_GET_CLASS (vol->button)->size_request (vol->button, &but_req);
+    GTK_WIDGET_GET_CLASS (vol->scales->data)->size_request (vol->scales->data,
+							    &scale_req);
+
+    /* calculate */
+    gtk_widget_get_allocation (widget, &allocation);
+    x_offset = (allocation.width -
+        ((vol->track->num_channels * scale_req.width) +
+        (vol->track->num_channels - 1) * vol->padding)) / 2;
+    y_offset = allocation.height - but_req.height;
+    width = allocation.width - (2 * x_offset + but_req.width);
+    height = but_req.height / 2;
+    points[0].y = y_offset + 3;
+    points[1].y = points[2].y = points[0].y + height - 3;
+
+    /* draw chainbutton decorations */
+    style = gtk_widget_get_style (widget);
+    state = gtk_widget_get_state (widget);
+
+    points[0].x = points[1].x = x_offset + 3;
+    points[2].x = points[0].x + width - 6;
+    gtk_paint_polygon (style, gtk_widget_get_window (widget),
+		       state,
+		       GTK_SHADOW_ETCHED_IN,
+		       &expose->area, widget, "hseparator",
+		       points, 3, FALSE);
+
+    points[0].x = points[1].x = allocation.width - x_offset - 3;
+    points[2].x = points[0].x - width + 6;
+    gtk_paint_polygon (style, gtk_widget_get_window (widget),
+		       state,
+		       GTK_SHADOW_ETCHED_IN,
+		       &expose->area, widget, "hseparator",
+		       points, 3, FALSE);
+  }
+
+  /* take care of redrawing the kids */
+  return GTK_WIDGET_CLASS (mate_volume_control_volume_parent_class)->expose_event (widget, expose);
+}
+
+/*
+ * Signals handlers.
+ */
+
+static void
+cb_volume_changed (GtkAdjustment *_adj,
+		   gpointer       data)
+{
+  MateVolumeControlVolume *vol = data;
+  gint *volumes, i = 0;
+  GList *scales;
+
+  if (vol->locked)
+    return;
+  vol->locked = TRUE;
+  volumes = g_new (gint, vol->track->num_channels);
+
+  for (scales = vol->scales; scales != NULL; scales = scales->next) {
+    GtkAdjustment *adj = gtk_range_get_adjustment (scales->data);
+
+    if (mate_volume_control_button_get_active (
+            MATE_VOLUME_CONTROL_BUTTON (vol->button))) {
+      gtk_adjustment_set_value (adj, gtk_adjustment_get_value (_adj));
+      volumes[i++] = rint (gtk_adjustment_get_value (_adj));
+    } else {
+      volumes[i++] = rint (gtk_adjustment_get_value (adj));
+    }
+  }
+
+  gst_mixer_set_volume (vol->mixer, vol->track, volumes);
+
+  g_free (volumes);
+  vol->locked = FALSE;
+}
+
+static void
+cb_lock_toggled (GtkToggleButton *button,
+		 gpointer         data)
+{
+  MateVolumeControlVolume *vol = data;
+
+  if (mate_volume_control_button_get_active (
+          MATE_VOLUME_CONTROL_BUTTON (vol->button))) {
+    /* get the mean value, and set it on the first adjustment.
+     * the cb_volume_changed () callback will take care of the
+     * rest. */
+    gint volume = 0, num = 0;
+    GList *scales;
+
+    for (scales = vol->scales ; scales != NULL; scales = scales->next) {
+      GtkAdjustment *adj = gtk_range_get_adjustment (scales->data);
+
+      num++;
+      volume += gtk_adjustment_get_value (adj);
+    }
+
+    /* safety check */
+    if (vol->scales != NULL) {
+      gtk_adjustment_set_value (gtk_range_get_adjustment (vol->scales->data),
+				volume / num);
+    }
+  }
+}
+
+/*
+ * See if our volume is zero.
+ */
+
+void
+mate_volume_control_volume_ask (MateVolumeControlVolume * vol,
+    gboolean *real_zero, gboolean *slider_zero)
+{
+  GList *scales;
+  gint *volumes, n, tot = 0;
+
+  volumes = g_new (gint, vol->track->num_channels);
+  gst_mixer_get_volume (vol->mixer, vol->track, volumes);
+  for (n = 0; n < vol->track->num_channels; n++)
+    tot += volumes[n];
+  g_free (volumes);
+  *real_zero = (tot == 0);
+
+  *slider_zero = TRUE;
+  for (n = 0, scales = vol->scales;
+       scales != NULL; scales = scales->next, n++) {
+    GtkAdjustment *adj = gtk_range_get_adjustment (scales->data);
+                                                                                
+    if (rint (gtk_adjustment_get_value (adj)) != 0) {
+      *slider_zero = FALSE;
+      break;
+    }
+  }
+}
+
+
+void
+mate_volume_control_volume_update (MateVolumeControlVolume *vol)
+{
+  gint *volumes, n;
+  GList *scales;
+
+  /* don't do callbacks */
+  if (vol->locked)
+    return;
+
+  vol->locked = TRUE;
+
+  volumes = g_new (gint, vol->track->num_channels);
+  gst_mixer_get_volume (vol->mixer, vol->track, volumes);
+
+  /* did we change? */
+  for (n = 0, scales = vol->scales;
+       scales != NULL; scales = scales->next, n++) {
+    GtkAdjustment *adj = gtk_range_get_adjustment (scales->data);
+
+    if ((gint) gtk_adjustment_get_value (adj) != volumes[n]) {
+      gtk_range_set_value (scales->data, volumes[n]);
+    }
+
+    /* should we release lock? */
+    if (volumes[n] != volumes[0]) {
+      mate_volume_control_button_set_active (
+	MATE_VOLUME_CONTROL_BUTTON (vol->button), FALSE);
+    }
+  }
+
+  g_free (volumes);
+  vol->locked = FALSE;
+}
+
+/*
+ * Timeout to check for volume changes.
+ */
+
+static gboolean
+cb_check (gpointer data)
+{
+  mate_volume_control_volume_update (data);
+
+  return TRUE;
+}