gstreamer/gst/sine/demo-dparams.c
Steve Baker d66933e37f sinesrc:
Original commit message from CVS:
sinesrc:
- fixed timestamp calculation (again)
- renamed buffer_size to the less ambigious samples_per_buffer
demo_dparams:
- replaced clumsy g_object_set_property with g_object_set
- use volume element for volume (just for testing)
2002-05-05 15:46:05 +00:00

146 lines
4.8 KiB
C

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <gtk/gtk.h>
#include <gst/gst.h>
#include <gst/control/control.h>
#define ZERO(mem) memset(&mem, 0, sizeof(mem))
static gint quit_live(GtkWidget *window, GdkEventAny *e, gpointer data) {
gtk_main_quit();
return FALSE;
}
static void dynparm_log_value_changed(GtkAdjustment *adj,GstDParam *dparam) {
gfloat value;
g_return_if_fail(dparam != NULL);
g_return_if_fail(GST_IS_DPARAM (dparam));
value = exp(adj->value);
g_print("setting value to %f\n", value);
g_object_set(G_OBJECT(dparam), "value_float", value, NULL);
}
static void dynparm_value_changed(GtkAdjustment *adj,GstDParam *dparam) {
g_return_if_fail(dparam != NULL);
g_return_if_fail(GST_IS_DPARAM (dparam));
g_print("setting value to %f\n", adj->value);
g_object_set(G_OBJECT(dparam), "value_float", (gfloat)adj->value, NULL);
}
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, *volfilter, *osssink;
GstDParamManager *dpman;
GstDParam *volume;
GstDParam *freq;
GParamSpecFloat *spec;
gtk_init(&argc,&argv);
gst_init(&argc,&argv);
gst_control_init(&argc,&argv);
/***** construct the pipeline *****/
g_print("creating elements\n");
thread = gst_thread_new("live-example");
sinesrc = gst_element_factory_make("sinesrc","sine-source");
osssink = gst_element_factory_make("osssink","sound-sink");
volfilter = gst_element_factory_make("volume","volume-filter");
gst_bin_add_many(GST_BIN(thread), sinesrc, volfilter, osssink, NULL);
gst_element_connect_many(sinesrc, volfilter, osssink, NULL);
/* this breaks with current alsa oss compat lib */
g_object_set(G_OBJECT(osssink),"fragment",0x00180008,NULL);
g_object_set(G_OBJECT(sinesrc),"samplesperbuffer",64,NULL);
/***** 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);
/***** set up the dparams *****/
freq = gst_dpsmooth_new(G_TYPE_FLOAT);
g_object_set(G_OBJECT(freq), "update_period", 2000000LL, NULL);
/* 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_object_set(G_OBJECT(freq), "slope_delta_float", 0.693F, NULL);
g_object_set(G_OBJECT(freq), "slope_time", 50000000LL, NULL);
dpman = gst_dpman_get_manager (sinesrc);
g_assert(gst_dpman_attach_dparam (dpman, "freq", freq));
gst_dpman_set_mode(dpman, "synchronous");
spec = (GParamSpecFloat*)gst_dpman_get_param_spec (dpman, "freq");
freq_adj = (GtkAdjustment*)gtk_adjustment_new((gfloat)log(spec->default_value),
(gfloat)log(spec->minimum),
(gfloat)log(spec->maximum), 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);
volume = gst_dpsmooth_new(G_TYPE_FLOAT);
g_object_set(G_OBJECT(volume), "update_period", 2000000LL, NULL);
/* this defines the maximum slope that this *
* param can change. This says that in 50ms *
* the value can change from 0.0 to 1.0 */
g_object_set(G_OBJECT(volume), "slope_delta_float", 1.0F, NULL);
g_object_set(G_OBJECT(volume), "slope_time", 50000000LL, NULL);
dpman = gst_dpman_get_manager (volfilter);
g_assert(gst_dpman_attach_dparam (dpman, "volume", volume));
gst_dpman_set_mode(dpman, "synchronous");
g_object_set(G_OBJECT(volfilter), "mute", FALSE, NULL);
spec = (GParamSpecFloat*)gst_dpman_get_param_spec (dpman, "volume");
volume_adj = (GtkAdjustment*)gtk_adjustment_new(spec->default_value, 0.0, 1.2, 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);
/***** 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;
}