gstreamer/tests/examples/equalizer/demo.c

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/* GStreamer
* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/* TODO: We use gdk_cairo_create() and others, which are deprecated */
#define GDK_DISABLE_DEPRECATION_WARNINGS
#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
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on_window_destroy (GObject * 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 };
cairo_t *cr;
if (!drawingarea)
return;
gdk_window_begin_paint_rect (gtk_widget_get_window (drawingarea), &rect);
cr = gdk_cairo_create (gtk_widget_get_window (drawingarea));
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_rectangle (cr, 0, 0, spect_bands, spect_height);
cairo_fill (cr);
for (i = 0; i < spect_bands; i++) {
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_rectangle (cr, i, -data[i], 1, spect_height + data[i]);
cairo_fill (cr);
}
cairo_destroy (cr);
gdk_window_end_paint (gtk_widget_get_window (drawingarea));
}
static void
dynamic_link (GstPadTemplate * templ, GstPad * newpad, gpointer user_data)
{
GstPad *target = GST_PAD (user_data);
gst_pad_link (newpad, target);
gst_object_unref (target);
}
/* receive spectral data from element message */
static 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 = g_new (gfloat, 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);
g_free (spect);
}
}
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *decodebin, *decconvert;
GstElement *capsfilter, *equalizer, *spectrum, *sinkconvert, *sink;
GstCaps *caps;
GstBus *bus;
GtkWidget *appwindow, *vbox, *hbox, *scale;
int i, num_bands = NBANDS;
GOptionEntry options[] = {
{"bands", 'b', 0, G_OPTION_ARG_INT, &num_bands,
"Number of bands", NULL},
{NULL}
};
GOptionContext *ctx;
GError *err = NULL;
ctx = g_option_context_new ("- demo of audio equalizer");
g_option_context_add_main_entries (ctx, options, NULL);
g_option_context_add_group (ctx, gst_init_get_option_group ());
g_option_context_add_group (ctx, gtk_get_option_group (TRUE));
if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
g_print ("Error initializing: %s\n", err->message);
g_option_context_free (ctx);
g_clear_error (&err);
exit (1);
}
g_option_context_free (ctx);
if (argc < 2) {
g_print ("Usage: %s <uri to play>\n", argv[0]);
g_print (" For optional arguments: --help\n");
exit (-1);
}
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
/* Uri decoding */
decodebin = gst_element_factory_make ("uridecodebin", "decoder");
g_object_set (G_OBJECT (decodebin), "uri", argv[1], NULL);
/* Force float32 samples */
decconvert = gst_element_factory_make ("audioconvert", "decconvert");
capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
caps =
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gst_caps_new_simple ("audio/x-raw", "format", G_TYPE_STRING, "F32LE",
NULL);
g_object_set (capsfilter, "caps", caps, NULL);
equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
g_object_set (G_OBJECT (equalizer), "num-bands", num_bands, NULL);
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
"post-messages", TRUE, "interval", 500 * GST_MSECOND, NULL);
sinkconvert = gst_element_factory_make ("audioconvert", "sinkconvert");
sink = gst_element_factory_make ("autoaudiosink", "sink");
gst_bin_add_many (GST_BIN (bin), decodebin, decconvert, capsfilter, equalizer,
spectrum, sinkconvert, sink, NULL);
if (!gst_element_link_many (decconvert, capsfilter, equalizer, spectrum,
sinkconvert, sink, NULL)) {
fprintf (stderr, "can't link elements\n");
exit (1);
}
/* Handle dynamic pads */
g_signal_connect (G_OBJECT (decodebin), "pad-added",
G_CALLBACK (dynamic_link), gst_element_get_static_pad (decconvert,
"sink"));
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);
gtk_window_set_title (GTK_WINDOW (appwindow), "Equalizer Demo");
g_signal_connect (G_OBJECT (appwindow), "destroy",
G_CALLBACK (on_window_destroy), NULL);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 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_box_new (GTK_ORIENTATION_HORIZONTAL, 20);
for (i = 0; i < num_bands; i++) {
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GObject *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);
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g_object_get (band, "freq", &freq, NULL);
g_object_get (band, "bandwidth", &bw, NULL);
g_object_get (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_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
/* Create gain scale */
scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
-24.0, 12.0, 0.5);
gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_value (GTK_RANGE (scale), gain);
gtk_widget_set_size_request (scale, 35, 150);
g_signal_connect (G_OBJECT (scale), "value-changed",
G_CALLBACK (on_gain_changed), (gpointer) band);
gtk_box_pack_start (GTK_BOX (scales_hbox), scale, FALSE, FALSE, 0);
/* Create bandwidth scale */
scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
0.0, 20000.0, 5.0);
gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_value (GTK_RANGE (scale), bw);
gtk_widget_set_size_request (scale, 45, 150);
g_signal_connect (G_OBJECT (scale), "value-changed",
G_CALLBACK (on_bandwidth_changed), (gpointer) band);
gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);
/* Create frequency scale */
scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
20.0, 20000.0, 5.0);
gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_value (GTK_RANGE (scale), freq);
gtk_widget_set_size_request (scale, 45, 150);
g_signal_connect (G_OBJECT (scale), "value-changed",
G_CALLBACK (on_freq_changed), (gpointer) band);
gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);
gtk_container_add (GTK_CONTAINER (frame), scales_hbox);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 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;
}