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

Original commit message from CVS:
freq slider now uses smooth log dparam. sounds real smooth now

diff --git a/test/sinesliders.c b/test/sinesliders.c
index 48d4c70..04d9911 100644 (file)
--- a/test/sinesliders.c
+++ b/test/sinesliders.c
@@ -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_smooth_new(G_TYPE_FLOAT);
+  vals = GST_DPARAM_GET_POINT(freq, 0LL);
   
-  freq = gst_dparam_new(G_TYPE_FLOAT);
-  //volume = gst_dparam_new(G_TYPE_FLOAT);
+  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);