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