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#include <stdio.h>
#include <math.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <libs/control/gstcontrol.h>
static gint quit_live(GtkWidget *window, GdkEventAny *e, gpointer data) {
gtk_main_quit();
return FALSE;
}
//static void volume_changed(GtkAdjustment *adj,GstElement *element) {
//fprintf(stderr,"setting volume to %f\n",adj->value);
// 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);
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]), adj->value);
g_value_set_float(point[0], adj->value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
GST_DPARAM_UNLOCK(dparam);
}
int main(int argc,char *argv[]) {
GtkWidget *window;
GtkWidget *hbox;
GtkAdjustment *volume_adj;
GtkAdjustment *freq_adj;
GtkWidget *volume_slider;
GtkWidget *freq_slider;
GstElement *thread, *sinesrc, *osssink;
GstDParamManager *dpman;
GstDParam *volume;
GstDParam *freq;
GstDParamSpec *spec;
GValue **vals;
gtk_init(&argc,&argv);
gst_init(&argc,&argv);
/***** construct the pipeline *****/
g_print("creating elements\n");
thread = gst_thread_new("live-example");
sinesrc = gst_elementfactory_make("sinesrc","sine-source");
osssink = gst_elementfactory_make("osssink","sound-sink");
gst_bin_add(GST_BIN(thread),sinesrc);
gst_bin_add(GST_BIN(thread),osssink);
gst_element_connect(sinesrc,"src",osssink,"sink");
g_object_set(G_OBJECT(osssink),"fragment",0x00180008,NULL);
g_object_set(G_OBJECT(sinesrc),"buffersize",64,NULL);
dpman = gst_dpman_get_manager (sinesrc);
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);
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(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;
g_assert(gst_dpman_attach_dparam (dpman, "volume", volume));
g_assert(gst_dpman_attach_dparam (dpman, "freq", freq));
gst_dpman_set_mode(dpman, "synchronous");
/***** set up the GUI *****/
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 80, 400);
g_signal_connect(window,"delete_event",GTK_SIGNAL_FUNC(quit_live),NULL);
hbox = gtk_hbox_new(TRUE,0);
gtk_container_add(GTK_CONTAINER(window),hbox);
spec = gst_dpman_get_dparam_spec (dpman, "volume");
volume_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);
volume_slider = gtk_vscale_new(volume_adj);
gtk_scale_set_digits(GTK_SCALE(volume_slider), 2);
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((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_scale_set_digits(GTK_SCALE(freq_slider), 2);
gtk_box_pack_start(GTK_BOX(hbox),freq_slider,TRUE,TRUE,0);
/***** set up the handlers and such *****/
//gtk_signal_connect(volume_adj,"value-changed",GTK_SIGNAL_FUNC(volume_changed),sinesrc);
g_signal_connect(volume_adj,"value-changed",
GTK_SIGNAL_FUNC(dynparm_value_changed),
volume);
g_signal_connect(freq_adj,"value-changed",
GTK_SIGNAL_FUNC(dynparm_log_value_changed),
freq);
gtk_adjustment_value_changed(volume_adj);
gtk_adjustment_value_changed(freq_adj);
g_print("starting pipeline\n");
/***** start everything up *****/
gst_element_set_state(thread,GST_STATE_PLAYING);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
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