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-rw-r--r--panels/sound/cc-level-bar.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/panels/sound/cc-level-bar.c b/panels/sound/cc-level-bar.c
new file mode 100644
index 0000000..8d8b2c9
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+++ b/panels/sound/cc-level-bar.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2018 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cc-level-bar.h"
+#include "cc-sound-enums.h"
+#include "gvc-mixer-stream-private.h"
+
+struct _CcLevelBar
+{
+ GtkWidget parent_instance;
+
+ CcStreamType type;
+ pa_stream *level_stream;
+ gdouble last_input_peak;
+
+ gdouble value;
+};
+
+G_DEFINE_TYPE (CcLevelBar, cc_level_bar, GTK_TYPE_WIDGET)
+
+#define LED_WIDTH 12
+#define LED_HEIGHT 3
+#define LED_SPACING 4
+
+#define DECAY_STEP .15
+
+static void
+set_peak (CcLevelBar *self,
+ gdouble value)
+{
+ if (value < 0)
+ value = 0;
+ if (value > 1)
+ value = 1;
+
+ if (self->last_input_peak >= DECAY_STEP &&
+ value < self->last_input_peak - DECAY_STEP)
+ value = self->last_input_peak - DECAY_STEP;
+ self->last_input_peak = value;
+
+ self->value = value;
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+read_cb (pa_stream *stream,
+ size_t length,
+ void *userdata)
+{
+ CcLevelBar *self = userdata;
+ const void *data;
+ gdouble value;
+
+ if (pa_stream_peek (stream, &data, &length) < 0)
+ {
+ g_warning ("Failed to read data from stream");
+ return;
+ }
+
+ if (!data)
+ {
+ pa_stream_drop (stream);
+ return;
+ }
+
+ assert (length > 0);
+ assert (length % sizeof (float) == 0);
+
+ value = ((const float *) data)[length / sizeof (float) -1];
+
+ pa_stream_drop (stream);
+
+ set_peak (self, value);
+}
+
+static void
+suspended_cb (pa_stream *stream,
+ void *userdata)
+{
+ CcLevelBar *self = userdata;
+
+ if (pa_stream_is_suspended (stream))
+ {
+ g_debug ("Stream suspended");
+ self->value = 0.0;
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+ }
+}
+
+static void
+cc_level_bar_get_preferred_height (GtkWidget *widget,
+ gint *minimum,
+ gint *natural)
+{
+ *minimum = *natural = LED_HEIGHT;
+}
+
+static void
+set_source_blend (cairo_t *cr, GdkRGBA *a, GdkRGBA *b, gdouble f)
+{
+ cairo_set_source_rgb (cr,
+ (1.0 - f) * a->red + f * b->red,
+ (1.0 - f) * a->green + f * b->green,
+ (1.0 - f) * a->blue + f * b->blue);
+}
+
+static gboolean
+cc_level_bar_draw (GtkWidget *widget,
+ cairo_t *cr)
+{
+ CcLevelBar *self = CC_LEVEL_BAR (widget);
+ GtkAllocation allocation;
+ GdkRGBA inactive_color, active_color;
+ int i, n_leds;
+ double level;
+ double spacing, x_offset = 0.0;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ n_leds = allocation.width / (LED_WIDTH + LED_SPACING);
+ spacing = (double) (allocation.width - (n_leds * LED_WIDTH)) / (n_leds - 1);
+ level = self->value * n_leds;
+
+ gdk_rgba_parse (&inactive_color, "#C0C0C0");
+ switch (self->type)
+ {
+ default:
+ case CC_STREAM_TYPE_OUTPUT:
+ gdk_rgba_parse (&active_color, "#4a90d9");
+ break;
+ case CC_STREAM_TYPE_INPUT:
+ gdk_rgba_parse (&active_color, "#ff0000");
+ break;
+ }
+
+ for (i = 0; i < n_leds; i++)
+ {
+ double led_level;
+
+ led_level = level - i;
+ if (led_level < 0.0)
+ led_level = 0.0;
+ else if (led_level > 1.0)
+ led_level = 1.0;
+
+ cairo_rectangle (cr,
+ x_offset, 0,
+ LED_WIDTH, allocation.height);
+ set_source_blend (cr, &inactive_color, &active_color, led_level);
+ cairo_fill (cr);
+ x_offset += LED_WIDTH + spacing;
+ }
+
+ return FALSE;
+}
+
+static void
+close_stream (pa_stream *stream)
+{
+ if (stream == NULL)
+ return;
+
+ /* Stop receiving data */
+ pa_stream_set_read_callback (stream, NULL, NULL);
+ pa_stream_set_suspended_callback (stream, NULL, NULL);
+
+ /* Disconnect from the stream */
+ pa_stream_disconnect (stream);
+}
+
+static void
+cc_level_bar_dispose (GObject *object)
+{
+ CcLevelBar *self = CC_LEVEL_BAR (object);
+
+ close_stream (self->level_stream);
+ g_clear_pointer (&self->level_stream, pa_stream_unref);
+
+ G_OBJECT_CLASS (cc_level_bar_parent_class)->dispose (object);
+}
+
+void
+cc_level_bar_class_init (CcLevelBarClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->dispose = cc_level_bar_dispose;
+
+ widget_class->get_preferred_height = cc_level_bar_get_preferred_height;
+ widget_class->draw = cc_level_bar_draw;
+}
+
+void
+cc_level_bar_init (CcLevelBar *self)
+{
+ gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+}
+
+void
+cc_level_bar_set_stream (CcLevelBar *self,
+ GvcMixerStream *stream,
+ CcStreamType type)
+{
+ pa_context *context;
+ pa_sample_spec sample_spec;
+ pa_proplist *proplist;
+ pa_buffer_attr attr;
+ g_autofree gchar *device = NULL;
+
+ g_return_if_fail (CC_IS_LEVEL_BAR (self));
+
+ close_stream (self->level_stream);
+ g_clear_pointer (&self->level_stream, pa_stream_unref);
+
+ self->type = type;
+
+ if (stream == NULL)
+ {
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+ return;
+ }
+
+ context = gvc_mixer_stream_get_pa_context (stream);
+
+ if (pa_context_get_server_protocol_version (context) < 13)
+ {
+ g_warning ("Unsupported version of PulseAudio");
+ return;
+ }
+
+ sample_spec.channels = 1;
+ sample_spec.format = PA_SAMPLE_FLOAT32;
+ sample_spec.rate = 25;
+
+ proplist = pa_proplist_new ();
+ pa_proplist_sets (proplist, PA_PROP_APPLICATION_ID, "org.gnome.VolumeControl");
+ self->level_stream = pa_stream_new_with_proplist (context, "Peak detect", &sample_spec, NULL, proplist);
+ pa_proplist_free (proplist);
+ if (self->level_stream == NULL)
+ {
+ g_warning ("Failed to create monitoring stream");
+ return;
+ }
+
+ pa_stream_set_read_callback (self->level_stream, read_cb, self);
+ pa_stream_set_suspended_callback (self->level_stream, suspended_cb, self);
+
+ memset (&attr, 0, sizeof (attr));
+ attr.fragsize = sizeof (float);
+ attr.maxlength = (uint32_t) -1;
+ device = g_strdup_printf ("%u", gvc_mixer_stream_get_index (stream));
+ if (pa_stream_connect_record (self->level_stream,
+ device,
+ &attr,
+ (pa_stream_flags_t) (PA_STREAM_DONT_MOVE |
+ PA_STREAM_PEAK_DETECT |
+ PA_STREAM_ADJUST_LATENCY)) < 0)
+ {
+ g_warning ("Failed to connect monitoring stream");
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
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