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c270b7e123
Original commit message from CVS: * gst/spectrum/Makefile.am: Link to base libraries * gst/spectrum/demo-osssrc.c: (main): use new threshhold property * gst/spectrum/gstspectrum.c: (gst_spectrum_class_init), (gst_spectrum_init), (gst_spectrum_dispose), (gst_spectrum_set_property), (gst_spectrum_set_sink_caps), (gst_spectrum_get_sink_caps), (gst_spectrum_chain), (gst_spectrum_change_state): * gst/spectrum/gstspectrum.h: Use gst_adapter, support multiple-channels, add threshold property for result, add docs, fix resulting spectrum range (was including mirrored results)
75 lines
2 KiB
C
75 lines
2 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 DEFAULT_AUDIOSRC "alsasrc"
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#define SPECT_BANDS 256
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GtkWidget *drawingarea;
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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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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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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;
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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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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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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 (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 (bin);
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return 0;
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}
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