67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
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// SPDX-License-Identifier: GPL-3.0-or-later
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#include "gtkdial.h"
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#include "widget-gain.h"
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static void gain_changed(GtkWidget *widget, struct alsa_elem *elem) {
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int value = gtk_dial_get_value(GTK_DIAL(widget));
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alsa_set_elem_value(elem, value);
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}
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static void gain_updated(struct alsa_elem *elem) {
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int is_writable = alsa_get_elem_writable(elem);
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gtk_widget_set_sensitive(elem->widget, is_writable);
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int alsa_value = alsa_get_elem_value(elem);
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gtk_dial_set_value(GTK_DIAL(elem->widget), alsa_value);
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char s[20];
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float scale = (float)(elem->max_dB - elem->min_dB) /
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(elem->max_val - elem->min_val);
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float value = (float)alsa_value * scale + elem->min_dB;
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if (scale < 1)
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snprintf(s, 20, "%.1f", value);
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else
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snprintf(s, 20, "%.0fdB", value);
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gtk_label_set_text(GTK_LABEL(elem->widget2), s);
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}
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GtkWidget *make_gain_alsa_elem(struct alsa_elem *elem) {
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GtkWidget *vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
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gtk_widget_set_hexpand(vbox, TRUE);
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GtkWidget *dial = gtk_dial_new_with_range(
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elem->min_val, elem->max_val, 1
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);
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// calculate 0dB value from min/max dB and min/max value
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float scale = (float)(elem->max_dB - elem->min_dB) /
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(elem->max_val - elem->min_val);
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int zero_db_value = (int)((0 - elem->min_dB) / scale + elem->min_val);
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gtk_dial_set_zero_db(GTK_DIAL(dial), zero_db_value);
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gtk_widget_set_vexpand(dial, TRUE);
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g_signal_connect(
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dial, "value-changed", G_CALLBACK(gain_changed), elem
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);
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elem->widget = dial;
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elem->widget_callback = gain_updated;
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GtkWidget *label = gtk_label_new(NULL);
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elem->widget2 = label;
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gain_updated(elem);
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gtk_box_append(GTK_BOX(vbox), dial);
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gtk_box_append(GTK_BOX(vbox), label);
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return vbox;
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}
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