gstreamer/tests/examples/spectrum/demo-osssrc.c
2012-06-20 10:01:57 +02:00

208 lines
6 KiB
C

/* GStreamer
* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gtk/gtk.h>
#ifndef DEFAULT_AUDIOSRC
#define DEFAULT_AUDIOSRC "alsasrc"
#endif
static guint spect_height = 64;
static guint spect_bands = 256;
static gfloat height_scale = 1.0;
static GtkWidget *drawingarea = NULL;
static GstClock *sync_clock = NULL;
static void
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;
}
/* 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);
cairo_set_source_rgb (cr, 1, 1, 1);
for (i = 0; i < spect_bands; i++) {
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));
}
/* process delayed message */
static gboolean
delayed_idle_spectrum_update (gpointer user_data)
{
draw_spectrum ((gfloat *) user_data);
g_free (user_data);
return (FALSE);
}
static gboolean
delayed_spectrum_update (GstClock * sync_clock, GstClockTime time,
GstClockID id, gpointer user_data)
{
if (GST_CLOCK_TIME_IS_VALID (time))
g_idle_add (delayed_idle_spectrum_update, user_data);
else
g_free (user_data);
return (TRUE);
}
/* 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) {
GstElement *spectrum = GST_ELEMENT (GST_MESSAGE_SRC (message));
GstClockTime timestamp, duration;
GstClockTime waittime = GST_CLOCK_TIME_NONE;
if (gst_structure_get_clock_time (s, "running-time", &timestamp) &&
gst_structure_get_clock_time (s, "duration", &duration)) {
/* wait for middle of buffer */
waittime = timestamp + duration / 2;
} else if (gst_structure_get_clock_time (s, "endtime", &timestamp)) {
waittime = timestamp;
}
if (GST_CLOCK_TIME_IS_VALID (waittime)) {
GstClockID clock_id;
GstClockTime basetime = gst_element_get_base_time (spectrum);
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);
}
clock_id =
gst_clock_new_single_shot_id (sync_clock, waittime + basetime);
gst_clock_id_wait_async (clock_id, delayed_spectrum_update,
(gpointer) spect, NULL);
gst_clock_id_unref (clock_id);
}
}
}
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GstBus *bus;
GtkWidget *appwindow;
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make (DEFAULT_AUDIOSRC, "src");
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
"message", TRUE, NULL);
sink = gst_element_factory_make ("fakesink", "sink");
gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
if (!gst_element_link_many (src, spectrum, 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);
sync_clock = gst_pipeline_get_clock (GST_PIPELINE (bin));
appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (G_OBJECT (appwindow), "destroy",
G_CALLBACK (on_window_destroy), NULL);
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_container_add (GTK_CONTAINER (appwindow), drawingarea);
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 (sync_clock);
gst_object_unref (bin);
return 0;
}