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freq slider now uses smooth log dparam. sounds real smooth now

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Original commit message from CVS:
freq slider now uses smooth log dparam. sounds real smooth now
This commit is contained in:
Steve Baker 2001-09-17 19:31:53 +00:00
parent c4630dfcee
commit fa71b53ffa
1 changed files with 38 additions and 11 deletions
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49
test/sinesliders.c
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@ -1,4 +1,5 @@
#include <stdio.h>
#include <math.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <sys/soundcard.h>
@ -13,6 +14,20 @@ static gint quit_live(GtkWidget *window, GdkEventAny *e, gpointer data) {
// gtk_object_set(GTK_OBJECT(element),"volume",adj->value,NULL);
//}
static void dynparm_log_value_changed(GtkAdjustment *adj,GstDParam *dparam) {
GValue **point;
g_return_if_fail(dparam != NULL);
g_return_if_fail(GST_IS_DPARAM (dparam));
point = GST_DPARAM_GET_POINT(dparam, 0LL);
GST_DPARAM_LOCK(dparam);
g_print("setting value from %f to %f\n", g_value_get_float(point[0]), (gfloat)exp(adj->value));
g_value_set_float(point[0], (gfloat)exp(adj->value));
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
GST_DPARAM_UNLOCK(dparam);
}
static void dynparm_value_changed(GtkAdjustment *adj,GstDParam *dparam) {
GValue **point;
g_return_if_fail(dparam != NULL);
@ -42,7 +57,7 @@ int main(int argc,char *argv[]) {
GstDParam *freq;
GstDParamSpec *spec;
GValue **vol_vals;
GValue **vals;
gtk_init(&argc,&argv);
gst_init(&argc,&argv);
@ -59,18 +74,30 @@ int main(int argc,char *argv[]) {
g_object_set(G_OBJECT(sinesrc),"buffersize",64,NULL);
dpman = GST_ELEMENT_DPARAM_MANAGER(sinesrc);
freq = gst_dparam_new(G_TYPE_FLOAT);
//volume = gst_dparam_new(G_TYPE_FLOAT);
freq = gst_dparam_smooth_new(G_TYPE_FLOAT);
vals = GST_DPARAM_GET_POINT(freq, 0LL);
g_value_set_float(vals[0], 10.0);
// this defines the maximum slope that this
// param can change. This says that in 50ms
// the value can change by a maximum of one semitone
// (the log of one semitone is 0.693)
g_value_set_float(vals[1], 0.693);
g_value_set_float(vals[2], 50000000.0);
// set the default update period to 0.5ms, or 2000Hz
GST_DPARAM_DEFAULT_UPDATE_PERIOD(freq) = 2000000LL;
volume = gst_dparam_smooth_new(G_TYPE_FLOAT);
vol_vals = GST_DPARAM_GET_POINT(volume, 0LL);
vals = GST_DPARAM_GET_POINT(volume, 0LL);
// this defines the maximum slope that this
// param can change. This says that in 10ms
// the value can change by a maximum of 0.2
g_value_set_float(vol_vals[1], 0.2);
g_value_set_float(vol_vals[2], 10000000.0);
g_value_set_float(vals[1], 0.2);
g_value_set_float(vals[2], 10000000.0);
// set the default update period to 0.5ms, or 2000Hz
GST_DPARAM_DEFAULT_UPDATE_PERIOD(volume) = 2000000LL;
@ -94,9 +121,9 @@ int main(int argc,char *argv[]) {
gtk_box_pack_start(GTK_BOX(hbox),volume_slider,TRUE,TRUE,0);
spec = gst_dpman_get_dparam_spec (dpman, "freq");
freq_adj = (GtkAdjustment*)gtk_adjustment_new(g_value_get_float(spec->default_val),
g_value_get_float(spec->min_val),
g_value_get_float(spec->max_val), 0.1, 0.01, 0.01);
freq_adj = (GtkAdjustment*)gtk_adjustment_new((gfloat)log(g_value_get_float(spec->default_val)),
(gfloat)log(g_value_get_float(spec->min_val)),
(gfloat)log(g_value_get_float(spec->max_val)), 0.1, 0.01, 0.01);
freq_slider = gtk_vscale_new(freq_adj);
gtk_box_pack_start(GTK_BOX(hbox),freq_slider,TRUE,TRUE,0);
@ -108,7 +135,7 @@ int main(int argc,char *argv[]) {
volume);
g_signal_connect(freq_adj,"value-changed",
GTK_SIGNAL_FUNC(dynparm_value_changed),
GTK_SIGNAL_FUNC(dynparm_log_value_changed),
freq);
gtk_adjustment_value_changed(volume_adj);
gtk_adjustment_value_changed(freq_adj);