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-rw-r--r--gst/equalizer/demo.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/gst/equalizer/demo.c b/gst/equalizer/demo.c
new file mode 100644
index 00000000..7e7fae4a
--- /dev/null
+++ b/gst/equalizer/demo.c
@@ -0,0 +1,246 @@
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <gst/gst.h>
+#include <gtk/gtk.h>
+
+#define NBANDS 10
+
+static GtkWidget *drawingarea = NULL;
+static guint spect_height = 128;
+static guint spect_bands = 256;
+static gfloat height_scale = 2.0;
+
+static void
+on_window_destroy (GtkObject * object, gpointer user_data)
+{
+ drawingarea = NULL;
+ gtk_main_quit ();
+}
+
+static gboolean
+on_configure_event (GtkWidget * widget, GdkEventConfigure * event,
+ gpointer user_data)
+{
+ GstElement *spectrum = GST_ELEMENT (user_data);
+
+ /*GST_INFO ("%d x %d", event->width, event->height); */
+ spect_height = event->height;
+ height_scale = event->height / 64.0;
+ spect_bands = event->width;
+
+ g_object_set (G_OBJECT (spectrum), "bands", spect_bands, NULL);
+ return FALSE;
+}
+
+/* control gains */
+static void
+on_gain_changed (GtkRange * range, gpointer user_data)
+{
+ GstObject *band = GST_OBJECT (user_data);
+ gdouble value = gtk_range_get_value (range);
+
+ g_object_set (band, "gain", value, NULL);
+}
+
+/* control bandwidths */
+static void
+on_bandwidth_changed (GtkRange * range, gpointer user_data)
+{
+ GstObject *band = GST_OBJECT (user_data);
+ gdouble value = gtk_range_get_value (range);
+
+ g_object_set (band, "bandwidth", value, NULL);
+}
+
+/* control frequency */
+static void
+on_freq_changed (GtkRange * range, gpointer user_data)
+{
+ GstObject *band = GST_OBJECT (user_data);
+ gdouble value = gtk_range_get_value (range);
+
+ /* hbox */
+ GtkWidget *parent = gtk_widget_get_parent (GTK_WIDGET (range));
+
+ /* frame */
+ GtkWidget *parent_parent = gtk_widget_get_parent (parent);
+ gchar *label = g_strdup_printf ("%d Hz", (int) (value + 0.5));
+
+ gtk_frame_set_label (GTK_FRAME (parent_parent), label);
+ g_free (label);
+
+ g_object_set (band, "freq", value, NULL);
+}
+
+/* draw frequency spectrum as a bunch of bars */
+static void
+draw_spectrum (gfloat * data)
+{
+ gint i;
+ GdkRectangle rect = { 0, 0, spect_bands, spect_height };
+
+ if (!drawingarea)
+ return;
+
+ gdk_window_begin_paint_rect (drawingarea->window, &rect);
+ gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
+ TRUE, 0, 0, spect_bands, spect_height);
+ for (i = 0; i < spect_bands; i++) {
+ gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
+ TRUE, i, spect_height - data[i], 1, data[i]);
+ }
+ gdk_window_end_paint (drawingarea->window);
+}
+
+/* receive spectral data from element message */
+gboolean
+message_handler (GstBus * bus, GstMessage * message, gpointer data)
+{
+ if (message->type == GST_MESSAGE_ELEMENT) {
+ const GstStructure *s = gst_message_get_structure (message);
+ const gchar *name = gst_structure_get_name (s);
+
+ if (strcmp (name, "spectrum") == 0) {
+ gfloat spect[spect_bands];
+ const GValue *list;
+ const GValue *value;
+ guint i;
+
+ list = gst_structure_get_value (s, "magnitude");
+ for (i = 0; i < spect_bands; ++i) {
+ value = gst_value_list_get_value (list, i);
+ spect[i] = height_scale * g_value_get_float (value);
+ }
+ draw_spectrum (spect);
+ }
+ }
+ return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+ GstElement *bin;
+ GstElement *src, *capsfilter, *equalizer, *spectrum, *audioconvert, *sink;
+ GstCaps *caps;
+ GstBus *bus;
+ GtkWidget *appwindow, *vbox, *hbox, *widget;
+
+ gst_init (&argc, &argv);
+ gtk_init (&argc, &argv);
+
+ bin = gst_pipeline_new ("bin");
+
+ src = gst_element_factory_make ("audiotestsrc", "src");
+ g_object_set (G_OBJECT (src), "wave", 5, NULL); /* White noise */
+
+ /* Force float32 samples */
+ capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
+ caps =
+ gst_caps_new_simple ("audio/x-raw-float", "width", G_TYPE_INT, 32, NULL);
+ g_object_set (capsfilter, "caps", caps, NULL);
+
+ equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
+ g_object_set (G_OBJECT (equalizer), "num-bands", NBANDS, NULL);
+
+ spectrum = gst_element_factory_make ("spectrum", "spectrum");
+ g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
+ "message", TRUE, "interval", 500 * GST_MSECOND, NULL);
+
+ audioconvert = gst_element_factory_make ("audioconvert", "audioconvert");
+
+ sink = gst_element_factory_make ("autoaudiosink", "sink");
+
+ gst_bin_add_many (GST_BIN (bin), src, capsfilter, equalizer, spectrum,
+ audioconvert, sink, NULL);
+ if (!gst_element_link_many (src, capsfilter, equalizer, spectrum,
+ audioconvert, sink, NULL)) {
+ fprintf (stderr, "can't link elements\n");
+ exit (1);
+ }
+
+ bus = gst_element_get_bus (bin);
+ gst_bus_add_watch (bus, message_handler, NULL);
+ gst_object_unref (bus);
+
+ appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ g_signal_connect (G_OBJECT (appwindow), "destroy",
+ G_CALLBACK (on_window_destroy), NULL);
+ vbox = gtk_vbox_new (FALSE, 6);
+
+ drawingarea = gtk_drawing_area_new ();
+ gtk_widget_set_size_request (drawingarea, spect_bands, spect_height);
+ g_signal_connect (G_OBJECT (drawingarea), "configure-event",
+ G_CALLBACK (on_configure_event), (gpointer) spectrum);
+ gtk_box_pack_start (GTK_BOX (vbox), drawingarea, TRUE, TRUE, 0);
+
+ hbox = gtk_hbox_new (FALSE, 30);
+
+ int i;
+
+ for (i = 0; i < NBANDS; i++) {
+ GstObject *band;
+ gdouble freq;
+ gdouble bw;
+ gdouble gain;
+ gchar *label;
+ GtkWidget *frame, *scales_hbox;
+
+ band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i);
+ g_assert (band != NULL);
+ g_object_get (G_OBJECT (band), "freq", &freq, NULL);
+ g_object_get (G_OBJECT (band), "bandwidth", &bw, NULL);
+ g_object_get (G_OBJECT (band), "gain", &gain, NULL);
+
+ label = g_strdup_printf ("%d Hz", (int) (freq + 0.5));
+ frame = gtk_frame_new (label);
+ g_free (label);
+
+ scales_hbox = gtk_hbox_new (FALSE, 6);
+
+ widget = gtk_vscale_new_with_range (-24.0, 12.0, 0.5);
+ gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
+ gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
+ gtk_range_set_value (GTK_RANGE (widget), gain);
+ gtk_widget_set_size_request (widget, 25, 150);
+ g_signal_connect (G_OBJECT (widget), "value-changed",
+ G_CALLBACK (on_gain_changed), (gpointer) band);
+ gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
+
+ widget = gtk_vscale_new_with_range (1.0, 20000.0, 5.0);
+ gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
+ gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
+ gtk_range_set_value (GTK_RANGE (widget), bw);
+ gtk_widget_set_size_request (widget, 25, 150);
+ g_signal_connect (G_OBJECT (widget), "value-changed",
+ G_CALLBACK (on_bandwidth_changed), (gpointer) band);
+ gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
+
+ widget = gtk_vscale_new_with_range (20.0, 20000.0, 5.0);
+ gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
+ gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
+ gtk_range_set_value (GTK_RANGE (widget), freq);
+ gtk_widget_set_size_request (widget, 25, 150);
+ g_signal_connect (G_OBJECT (widget), "value-changed",
+ G_CALLBACK (on_freq_changed), (gpointer) band);
+ gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
+
+ gtk_container_add (GTK_CONTAINER (frame), scales_hbox);
+
+ gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
+ }
+
+ gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
+
+ gtk_container_add (GTK_CONTAINER (appwindow), vbox);
+ gtk_widget_show_all (appwindow);
+
+ gst_element_set_state (bin, GST_STATE_PLAYING);
+ gtk_main ();
+ gst_element_set_state (bin, GST_STATE_NULL);
+
+ gst_object_unref (bin);
+
+ return 0;
+}
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