From 0f6e8ea21f39ae041ea0a453cc69985cf137a3cc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= Date: Tue, 30 Oct 2007 21:37:49 +0000 Subject: gst/equalizer/: Add small demo application based on the spectrum demo applications that gets white noise as input, pu... Original commit message from CVS: * gst/equalizer/Makefile.am: * gst/equalizer/demo.c: (on_window_destroy), (on_configure_event), (on_gain_changed), (on_bandwidth_changed), (on_freq_changed), (draw_spectrum), (message_handler), (main): Add small demo application based on the spectrum demo applications that gets white noise as input, pushes it through an equalizer and paints the spectrum. For every equalizer band it's possible to set gain, bandwidth and frequency. * gst/equalizer/gstiirequalizer.c: (setup_filter): Add some guarding against too large or too small frequencies and bandwidths. Also improve debugging a bit. --- gst/equalizer/demo.c | 246 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 gst/equalizer/demo.c (limited to 'gst/equalizer/demo.c') 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 +#include +#include +#include +#include + +#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; +} -- cgit v1.2.1