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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.
This commit is contained in:
Sebastian Dröge
parent
3b838968c2
commit
0f6e8ea21f
4 changed files with 296 additions and 12 deletions
14
ChangeLog
14
ChangeLog
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@ -1,3 +1,17 @@
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2007-10-30 Sebastian Dröge <slomo@circular-chaos.org>
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* gst/equalizer/Makefile.am:
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* gst/equalizer/demo.c: (on_window_destroy), (on_configure_event),
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(on_gain_changed), (on_bandwidth_changed), (on_freq_changed),
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(draw_spectrum), (message_handler), (main):
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Add small demo application based on the spectrum demo applications
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that gets white noise as input, pushes it through an equalizer and
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paints the spectrum. For every equalizer band it's possible to set
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gain, bandwidth and frequency.
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* gst/equalizer/gstiirequalizer.c: (setup_filter):
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Add some guarding against too large or too small frequencies and
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bandwidths. Also improve debugging a bit.
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2007-10-30 Sebastian Dröge <slomo@circular-chaos.org>
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* gst/equalizer/gstiirequalizer.c:
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@ -11,3 +11,12 @@ libgstequalizer_la_LIBADD = $(GST_LIBS) $(GST_PLUGINS_BASE_LIBS) -lgstaudio-$(GS
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libgstequalizer_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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noinst_HEADERS = gstiirequalizer.h
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if HAVE_GTK
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noinst_PROGRAMS = demo
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endif
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demo_SOURCES = demo.c
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demo_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GTK_CFLAGS)
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demo_LDFLAGS = $(GST_BASE_LIBS) $(GST_LIBS) $(GTK_LIBS)
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246
gst/equalizer/demo.c
Normal file
246
gst/equalizer/demo.c
Normal file
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@ -0,0 +1,246 @@
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <gst/gst.h>
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#include <gtk/gtk.h>
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#define NBANDS 10
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static GtkWidget *drawingarea = NULL;
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static guint spect_height = 128;
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static guint spect_bands = 256;
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static gfloat height_scale = 2.0;
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static void
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on_window_destroy (GtkObject * object, gpointer user_data)
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{
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drawingarea = NULL;
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gtk_main_quit ();
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}
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static gboolean
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on_configure_event (GtkWidget * widget, GdkEventConfigure * event,
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gpointer user_data)
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{
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GstElement *spectrum = GST_ELEMENT (user_data);
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/*GST_INFO ("%d x %d", event->width, event->height); */
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spect_height = event->height;
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height_scale = event->height / 64.0;
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spect_bands = event->width;
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g_object_set (G_OBJECT (spectrum), "bands", spect_bands, NULL);
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return FALSE;
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}
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/* control gains */
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static void
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on_gain_changed (GtkRange * range, gpointer user_data)
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{
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GstObject *band = GST_OBJECT (user_data);
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gdouble value = gtk_range_get_value (range);
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g_object_set (band, "gain", value, NULL);
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}
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/* control bandwidths */
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static void
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on_bandwidth_changed (GtkRange * range, gpointer user_data)
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{
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GstObject *band = GST_OBJECT (user_data);
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gdouble value = gtk_range_get_value (range);
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g_object_set (band, "bandwidth", value, NULL);
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}
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/* control frequency */
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static void
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on_freq_changed (GtkRange * range, gpointer user_data)
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{
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GstObject *band = GST_OBJECT (user_data);
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gdouble value = gtk_range_get_value (range);
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/* hbox */
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GtkWidget *parent = gtk_widget_get_parent (GTK_WIDGET (range));
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/* frame */
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GtkWidget *parent_parent = gtk_widget_get_parent (parent);
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gchar *label = g_strdup_printf ("%d Hz", (int) (value + 0.5));
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gtk_frame_set_label (GTK_FRAME (parent_parent), label);
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g_free (label);
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g_object_set (band, "freq", value, NULL);
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}
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/* draw frequency spectrum as a bunch of bars */
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static void
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draw_spectrum (gfloat * data)
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{
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gint i;
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GdkRectangle rect = { 0, 0, spect_bands, spect_height };
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if (!drawingarea)
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return;
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gdk_window_begin_paint_rect (drawingarea->window, &rect);
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gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
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TRUE, 0, 0, spect_bands, spect_height);
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for (i = 0; i < spect_bands; i++) {
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gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
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TRUE, i, spect_height - data[i], 1, data[i]);
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}
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gdk_window_end_paint (drawingarea->window);
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}
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/* receive spectral data from element message */
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gboolean
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message_handler (GstBus * bus, GstMessage * message, gpointer data)
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{
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if (message->type == GST_MESSAGE_ELEMENT) {
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const GstStructure *s = gst_message_get_structure (message);
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const gchar *name = gst_structure_get_name (s);
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if (strcmp (name, "spectrum") == 0) {
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gfloat spect[spect_bands];
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const GValue *list;
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const GValue *value;
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guint i;
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list = gst_structure_get_value (s, "magnitude");
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for (i = 0; i < spect_bands; ++i) {
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value = gst_value_list_get_value (list, i);
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spect[i] = height_scale * g_value_get_float (value);
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}
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draw_spectrum (spect);
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}
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}
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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GstElement *bin;
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GstElement *src, *capsfilter, *equalizer, *spectrum, *audioconvert, *sink;
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GstCaps *caps;
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GstBus *bus;
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GtkWidget *appwindow, *vbox, *hbox, *widget;
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gst_init (&argc, &argv);
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gtk_init (&argc, &argv);
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bin = gst_pipeline_new ("bin");
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src = gst_element_factory_make ("audiotestsrc", "src");
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g_object_set (G_OBJECT (src), "wave", 5, NULL); /* White noise */
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/* Force float32 samples */
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capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
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caps =
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gst_caps_new_simple ("audio/x-raw-float", "width", G_TYPE_INT, 32, NULL);
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g_object_set (capsfilter, "caps", caps, NULL);
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equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
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g_object_set (G_OBJECT (equalizer), "num-bands", NBANDS, NULL);
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spectrum = gst_element_factory_make ("spectrum", "spectrum");
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g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
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"message", TRUE, "interval", 500 * GST_MSECOND, NULL);
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audioconvert = gst_element_factory_make ("audioconvert", "audioconvert");
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sink = gst_element_factory_make ("autoaudiosink", "sink");
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gst_bin_add_many (GST_BIN (bin), src, capsfilter, equalizer, spectrum,
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audioconvert, sink, NULL);
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if (!gst_element_link_many (src, capsfilter, equalizer, spectrum,
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audioconvert, sink, NULL)) {
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fprintf (stderr, "can't link elements\n");
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exit (1);
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}
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bus = gst_element_get_bus (bin);
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gst_bus_add_watch (bus, message_handler, NULL);
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gst_object_unref (bus);
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appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (G_OBJECT (appwindow), "destroy",
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G_CALLBACK (on_window_destroy), NULL);
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vbox = gtk_vbox_new (FALSE, 6);
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drawingarea = gtk_drawing_area_new ();
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gtk_widget_set_size_request (drawingarea, spect_bands, spect_height);
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g_signal_connect (G_OBJECT (drawingarea), "configure-event",
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G_CALLBACK (on_configure_event), (gpointer) spectrum);
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gtk_box_pack_start (GTK_BOX (vbox), drawingarea, TRUE, TRUE, 0);
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hbox = gtk_hbox_new (FALSE, 30);
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int i;
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for (i = 0; i < NBANDS; i++) {
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GstObject *band;
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gdouble freq;
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gdouble bw;
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gdouble gain;
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gchar *label;
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GtkWidget *frame, *scales_hbox;
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band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i);
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g_assert (band != NULL);
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g_object_get (G_OBJECT (band), "freq", &freq, NULL);
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g_object_get (G_OBJECT (band), "bandwidth", &bw, NULL);
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g_object_get (G_OBJECT (band), "gain", &gain, NULL);
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label = g_strdup_printf ("%d Hz", (int) (freq + 0.5));
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frame = gtk_frame_new (label);
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g_free (label);
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scales_hbox = gtk_hbox_new (FALSE, 6);
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widget = gtk_vscale_new_with_range (-24.0, 12.0, 0.5);
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gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
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gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
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gtk_range_set_value (GTK_RANGE (widget), gain);
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gtk_widget_set_size_request (widget, 25, 150);
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g_signal_connect (G_OBJECT (widget), "value-changed",
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G_CALLBACK (on_gain_changed), (gpointer) band);
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gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
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widget = gtk_vscale_new_with_range (1.0, 20000.0, 5.0);
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gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
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gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
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gtk_range_set_value (GTK_RANGE (widget), bw);
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gtk_widget_set_size_request (widget, 25, 150);
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g_signal_connect (G_OBJECT (widget), "value-changed",
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G_CALLBACK (on_bandwidth_changed), (gpointer) band);
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gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
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widget = gtk_vscale_new_with_range (20.0, 20000.0, 5.0);
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gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
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gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
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gtk_range_set_value (GTK_RANGE (widget), freq);
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gtk_widget_set_size_request (widget, 25, 150);
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g_signal_connect (G_OBJECT (widget), "value-changed",
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G_CALLBACK (on_freq_changed), (gpointer) band);
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gtk_box_pack_start (GTK_BOX (scales_hbox), widget, FALSE, FALSE, 0);
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gtk_container_add (GTK_CONTAINER (frame), scales_hbox);
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gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
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}
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gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
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gtk_container_add (GTK_CONTAINER (appwindow), vbox);
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gtk_widget_show_all (appwindow);
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gst_element_set_state (bin, GST_STATE_PLAYING);
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gtk_main ();
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gst_element_set_state (bin, GST_STATE_NULL);
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gst_object_unref (bin);
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return 0;
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}
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@ -1,6 +1,7 @@
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/* GStreamer
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* Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
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* <2007> Stefan Kost <ensonic@users.sf.net>
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* <2007> Sebastian Dröge <slomo@circular-chaos.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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@ -33,7 +34,6 @@
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GST_DEBUG_CATEGORY (equalizer_debug);
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#define GST_CAT_DEFAULT equalizer_debug
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static void gst_iir_equalizer_child_proxy_interface_init (gpointer g_iface,
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gpointer iface_data);
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@ -376,17 +376,32 @@ setup_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
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* - we need shelf-filter for 1st and last band
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*/
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{
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gdouble gain = arg_to_scale (band->gain);
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gdouble frequency = band->freq / GST_AUDIO_FILTER (equ)->format.rate;
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gdouble omega = 2.0 * M_PI * frequency;
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gdouble bw =
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2.0 * M_PI * (band->width / GST_AUDIO_FILTER (equ)->format.rate);
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gdouble gain, omega, bw;
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gdouble edge_gain, gamma;
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gdouble alpha, beta;
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gdouble edge_gain = sqrt (gain);
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gdouble gamma = tan (bw / 2.0);
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gdouble alpha = gamma * edge_gain;
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gdouble beta = gamma / edge_gain;
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gain = arg_to_scale (band->gain);
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if (band->freq / GST_AUDIO_FILTER (equ)->format.rate > 0.5)
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omega = M_PI;
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else if (band->freq < 0.0)
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omega = 0.0;
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else
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omega = 2.0 * M_PI * (band->freq / GST_AUDIO_FILTER (equ)->format.rate);
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if (band->width / GST_AUDIO_FILTER (equ)->format.rate > 0.5)
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bw = M_PI;
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else if (band->width <= 1.0)
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bw = 2.0 * M_PI * (1.0 / GST_AUDIO_FILTER (equ)->format.rate);
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else
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bw = 2.0 * M_PI * (band->width / GST_AUDIO_FILTER (equ)->format.rate);
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edge_gain = sqrt (gain);
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gamma = tan (bw / 2.0);
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alpha = gamma * edge_gain;
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beta = gamma / edge_gain;
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band->a0 = (1.0 + alpha) / (1.0 + beta);
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band->a1 = (-2.0 * cos (omega)) / (1.0 + beta);
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@ -396,8 +411,8 @@ setup_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
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GST_INFO
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("gain = %7.5g, , bandwidth= %7.5g, frequency = %7.5g, a0 = %7.5g, a1 = %7.5g, a2=%7.5g b1 = %7.5g, b2 = %7.5g",
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gain, band->width, frequency, band->a0, band->a1, band->a2, band->b1,
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band->b2);
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band->gain, band->width, band->freq, band->a0, band->a1, band->a2,
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band->b1, band->b2);
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}
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}
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