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e7cfdce6ce
Original commit message from CVS: * gst/spectrum/Makefile.am: * gst/spectrum/demo-audiotest.c: (on_frequency_changed), (spectrum_chain), (main): * gst/spectrum/demo-osssrc.c: added another example * sys/v4l2/gstv4l2src.c: fix typo
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gtk/gtk.h>
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#define SPECT_BANDS 256
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static GtkWidget *drawingarea = NULL;
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static gint ct = 0;
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static void
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on_frequency_changed (GtkRange * range, gpointer user_data)
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{
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GstElement *machine = GST_ELEMENT (user_data);
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gdouble value = gtk_range_get_value (range);
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g_object_set (machine, "freq", value, NULL);
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}
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static void
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spectrum_chain (GstElement * sink, GstBuffer * buf, GstPad * pad,
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gpointer unused)
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{
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ct = (ct + 1) & 0x15;
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if (!ct) {
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gint i;
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guchar *data = buf->data;
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gint width = GST_BUFFER_SIZE (buf);
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GdkRectangle rect = { 0, 0, width, 50 };
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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, width, 50);
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for (i = 0; i < width; i++) {
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gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
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TRUE, i, 64 - 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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}
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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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GtkWidget *appwindow, *vbox, *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), "blocksize", (gulong) 1024 * 2, NULL);
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spectrum = gst_element_factory_make ("spectrum", "spectrum");
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g_object_set (G_OBJECT (spectrum), "width", SPECT_BANDS, "threshold", -80,
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NULL);
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sink = gst_element_factory_make ("fakesink", "sink");
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g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE, NULL);
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g_signal_connect (sink, "handoff", G_CALLBACK (spectrum_chain), NULL);
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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, "cant link elements\n");
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exit (1);
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}
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appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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vbox = gtk_vbox_new (FALSE, 6);
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widget = gtk_hscale_new_with_range (50.0, 20000.0, 10);
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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), 440.0);
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g_signal_connect (G_OBJECT (widget), "value-changed",
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G_CALLBACK (on_frequency_changed), (gpointer) src);
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gtk_container_add (GTK_CONTAINER (vbox), widget);
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drawingarea = gtk_drawing_area_new ();
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gtk_drawing_area_size (GTK_DRAWING_AREA (drawingarea), SPECT_BANDS, 64);
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gtk_container_add (GTK_CONTAINER (vbox), drawingarea);
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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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