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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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211 lines
6.1 KiB
C
211 lines
6.1 KiB
C
/* GStreamer
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* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
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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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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* TODO: We use gdk_cairo_create() and others, which are deprecated */
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#define GDK_DISABLE_DEPRECATION_WARNINGS
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#include <stdio.h>
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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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#ifndef DEFAULT_AUDIOSRC
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#define DEFAULT_AUDIOSRC "alsasrc"
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#endif
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static guint spect_height = 64;
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static guint spect_bands = 256;
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static gfloat height_scale = 1.0;
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static GtkWidget *drawingarea = NULL;
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static GstClock *sync_clock = NULL;
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static void
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on_window_destroy (GObject * 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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/* 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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cairo_t *cr;
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if (!drawingarea)
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return;
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gdk_window_begin_paint_rect (gtk_widget_get_window (drawingarea), &rect);
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cr = gdk_cairo_create (gtk_widget_get_window (drawingarea));
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_rectangle (cr, 0, 0, spect_bands, spect_height);
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cairo_fill (cr);
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cairo_set_source_rgb (cr, 1, 1, 1);
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for (i = 0; i < spect_bands; i++) {
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cairo_rectangle (cr, i, -data[i], 1, spect_height + data[i]);
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cairo_fill (cr);
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}
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cairo_destroy (cr);
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gdk_window_end_paint (gtk_widget_get_window (drawingarea));
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}
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/* process delayed message */
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static gboolean
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delayed_idle_spectrum_update (gpointer user_data)
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{
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draw_spectrum ((gfloat *) user_data);
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g_free (user_data);
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return (FALSE);
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}
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static gboolean
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delayed_spectrum_update (GstClock * sync_clock, GstClockTime time,
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GstClockID id, gpointer user_data)
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{
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if (GST_CLOCK_TIME_IS_VALID (time))
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g_idle_add (delayed_idle_spectrum_update, user_data);
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else
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g_free (user_data);
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return (TRUE);
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}
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/* receive spectral data from element message */
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static 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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GstElement *spectrum = GST_ELEMENT (GST_MESSAGE_SRC (message));
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GstClockTime timestamp, duration;
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GstClockTime waittime = GST_CLOCK_TIME_NONE;
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if (gst_structure_get_clock_time (s, "running-time", ×tamp) &&
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gst_structure_get_clock_time (s, "duration", &duration)) {
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/* wait for middle of buffer */
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waittime = timestamp + duration / 2;
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} else if (gst_structure_get_clock_time (s, "endtime", ×tamp)) {
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waittime = timestamp;
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}
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if (GST_CLOCK_TIME_IS_VALID (waittime)) {
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GstClockID clock_id;
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GstClockTime basetime = gst_element_get_base_time (spectrum);
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gfloat *spect = g_new (gfloat, 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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clock_id =
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gst_clock_new_single_shot_id (sync_clock, waittime + basetime);
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gst_clock_id_wait_async (clock_id, delayed_spectrum_update,
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(gpointer) spect, NULL);
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gst_clock_id_unref (clock_id);
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}
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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, *spectrum, *sink;
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GstBus *bus;
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GtkWidget *appwindow;
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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 (DEFAULT_AUDIOSRC, "src");
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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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"post-messages", TRUE, NULL);
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sink = gst_element_factory_make ("fakesink", "sink");
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gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
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if (!gst_element_link_many (src, spectrum, 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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sync_clock = gst_pipeline_get_clock (GST_PIPELINE (bin));
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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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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_container_add (GTK_CONTAINER (appwindow), drawingarea);
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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 (sync_clock);
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gst_object_unref (bin);
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return 0;
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}
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