df5d0960dd
This commit adds support for piecewise linear interpolation tapers to GtkDial and the gain widget so that the 4th Gen 4i4 volume knob taper can be modelled correctly.
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
// SPDX-FileCopyrightText: 2022-2024 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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struct gain {
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struct alsa_elem *elem;
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GtkWidget *vbox;
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GtkWidget *dial;
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GtkWidget *label;
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int zero_is_off;
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float scale;
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};
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static void gain_changed(GtkWidget *widget, struct gain *data) {
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int value = gtk_dial_get_value(GTK_DIAL(data->dial));
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alsa_set_elem_value(data->elem, value);
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}
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static void gain_updated(
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struct alsa_elem *elem,
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void *private
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) {
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struct gain *data = private;
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int is_writable = alsa_get_elem_writable(elem);
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gtk_widget_set_sensitive(data->dial, is_writable);
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int alsa_value = alsa_get_elem_value(elem);
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gtk_dial_set_value(GTK_DIAL(data->dial), alsa_value);
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char s[20];
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char *p = s;
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float value = (float)alsa_value * data->scale + elem->min_dB;
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if (value > elem->max_dB)
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value = elem->max_dB;
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else if (value < elem->min_dB)
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value = elem->min_dB;
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if (data->zero_is_off && alsa_value == 0) {
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p += sprintf(p, "−∞");
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} else {
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if (value < 0)
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p += sprintf(p, "−");
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if (data->scale < 1)
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p += sprintf(p, "%.1f", fabs(value));
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else
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p += sprintf(p, "%.0f", fabs(value));
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}
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if (data->scale >= 1)
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p += sprintf(p, "dB");
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gtk_label_set_text(GTK_LABEL(data->label), s);
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}
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//GList *make_gain_alsa_elem(struct alsa_elem *elem) {
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GtkWidget *make_gain_alsa_elem(
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struct alsa_elem *elem,
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int zero_is_off,
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int widget_taper
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) {
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struct gain *data = g_malloc(sizeof(struct gain));
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data->elem = elem;
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data->vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
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gtk_widget_set_hexpand(data->vbox, TRUE);
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data->scale = (float)(elem->max_dB - elem->min_dB) /
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(elem->max_val - elem->min_val);
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data->dial = gtk_dial_new_with_range(
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elem->min_val,
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elem->max_val,
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1,
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3 / data->scale
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);
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// calculate 0dB value
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int zero_db_value = (int)((0 - elem->min_dB) / data->scale + elem->min_val);
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gtk_dial_set_zero_db(GTK_DIAL(data->dial), zero_db_value);
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// convert from widget_taper to gtk_dial_taper
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int gtk_dial_taper;
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if (widget_taper == WIDGET_GAIN_TAPER_LINEAR)
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gtk_dial_taper = GTK_DIAL_TAPER_LINEAR;
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else if (widget_taper == WIDGET_GAIN_TAPER_LOG)
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gtk_dial_taper = GTK_DIAL_TAPER_LOG;
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else
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gtk_dial_taper = GTK_DIAL_TAPER_LINEAR;
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gtk_dial_set_taper(GTK_DIAL(data->dial), gtk_dial_taper);
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if (widget_taper == WIDGET_GAIN_TAPER_GEN4_VOLUME)
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gtk_dial_set_taper_linear_breakpoints(
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GTK_DIAL(data->dial),
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(const double[]){ 0.488, 0.76 },
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(const double[]){ 0.07, 0.4 },
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2
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);
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data->label = gtk_label_new(NULL);
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gtk_widget_set_vexpand(data->dial, TRUE);
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data->zero_is_off = zero_is_off;
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g_signal_connect(
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data->dial, "value-changed", G_CALLBACK(gain_changed), data
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);
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alsa_elem_add_callback(elem, gain_updated, data);
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gain_updated(elem, data);
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gtk_box_append(GTK_BOX(data->vbox), data->dial);
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gtk_box_append(GTK_BOX(data->vbox), data->label);
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return data->vbox;
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}
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