mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-26 19:51:11 +00:00
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
#include <stdio.h>
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#include <gtk/gtk.h>
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#include <gst/gst.h>
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#include <sys/soundcard.h>
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static gint quit_live(GtkWidget *window, GdkEventAny *e, gpointer data) {
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gtk_main_quit();
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return FALSE;
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}
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//static void volume_changed(GtkAdjustment *adj,GstElement *element) {
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//fprintf(stderr,"setting volume to %f\n",adj->value);
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// gtk_object_set(GTK_OBJECT(element),"volume",adj->value,NULL);
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//}
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static void dynparm_value_changed(GtkAdjustment *adj,GstDParam *dparam) {
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GValue **point;
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g_return_if_fail(dparam != NULL);
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g_return_if_fail(GST_IS_DPARAM (dparam));
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point = GST_DPARAM_GET_POINT(dparam, 0LL);
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GST_DPARAM_LOCK(dparam);
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g_print("setting value from %f to %f\n", g_value_get_float(point[0]), adj->value);
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g_value_set_float(point[0], adj->value);
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GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
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GST_DPARAM_UNLOCK(dparam);
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}
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int main(int argc,char *argv[]) {
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GtkWidget *window;
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GtkWidget *hbox;
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GtkAdjustment *volume_adj;
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GtkAdjustment *freq_adj;
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GtkWidget *volume_slider;
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GtkWidget *freq_slider;
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GstElement *thread, *sinesrc, *osssink;
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GstDParamManager *dpman;
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GstDParam *volume;
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GstDParam *freq;
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GValue **vol_vals;
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gtk_init(&argc,&argv);
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gst_init(&argc,&argv);
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/***** set up the GUI *****/
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window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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g_signal_connect(window,"delete_event",GTK_SIGNAL_FUNC(quit_live),NULL);
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hbox = gtk_hbox_new(TRUE,0);
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gtk_container_add(GTK_CONTAINER(window),hbox);
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volume_adj = (GtkAdjustment*)gtk_adjustment_new(1.0, 0.0, 1.0, 0.1, 0.01, 0.01);
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volume_slider = gtk_vscale_new(volume_adj);
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gtk_box_pack_start(GTK_BOX(hbox),volume_slider,TRUE,TRUE,0);
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freq_adj = (GtkAdjustment*)gtk_adjustment_new(440.0, 0.0, 2000.0, 1.0, 5.0, 5.0);
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freq_slider = gtk_vscale_new(freq_adj);
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gtk_box_pack_start(GTK_BOX(hbox),freq_slider,TRUE,TRUE,0);
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/***** construct the pipeline *****/
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g_print("creating elements\n");
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thread = gst_thread_new("live-example");
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sinesrc = gst_elementfactory_make("sinesrc","sine-source");
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osssink = gst_elementfactory_make("osssink","sound-sink");
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gst_bin_add(GST_BIN(thread),sinesrc);
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gst_bin_add(GST_BIN(thread),osssink);
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gst_element_connect(sinesrc,"src",osssink,"sink");
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g_object_set(G_OBJECT(sinesrc),"buffersize",64,NULL);
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dpman = GST_ELEMENT_DPARAM_MANAGER(sinesrc);
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freq = gst_dparam_new(G_TYPE_FLOAT);
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//volume = gst_dparam_new(G_TYPE_FLOAT);
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volume = gst_dparam_smooth_new(G_TYPE_FLOAT);
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vol_vals = GST_DPARAM_GET_POINT(volume, 0LL);
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// this defines the maximum slope that this
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// param can change. This says that in 10ms
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// the value can change by a maximum of 0.2
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g_value_set_float(vol_vals[1], 0.2);
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g_value_set_float(vol_vals[2], 10000000.0);
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// set the default update period to 0.5ms, or 2000Hz
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GST_DPARAM_DEFAULT_UPDATE_PERIOD(volume) = 2000000LL;
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g_assert(gst_dpman_attach_dparam (dpman, "volume", volume));
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g_assert(gst_dpman_attach_dparam (dpman, "freq", freq));
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gst_dpman_set_mode(dpman, "synchronous");
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/***** set up the handlers and such *****/
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//gtk_signal_connect(volume_adj,"value-changed",GTK_SIGNAL_FUNC(volume_changed),sinesrc);
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g_signal_connect(volume_adj,"value-changed",
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GTK_SIGNAL_FUNC(dynparm_value_changed),
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volume);
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g_signal_connect(freq_adj,"value-changed",
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GTK_SIGNAL_FUNC(dynparm_value_changed),
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freq);
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gtk_adjustment_value_changed(volume_adj);
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gtk_adjustment_value_changed(freq_adj);
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g_print("starting pipeline\n");
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/***** start everything up *****/
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gst_element_set_state(thread,GST_STATE_PLAYING);
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gtk_widget_show_all(window);
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gtk_main();
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return 0;
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}
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