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124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
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* Copyright (C) 2008 Jan Schmidt <jan.schmidt@sun.com>
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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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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <gst/gst.h>
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static guint spect_bands = 20;
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#define AUDIOFREQ 32000
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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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GstClockTime endtime;
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if (strcmp (name, "spectrum") == 0) {
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const GValue *magnitudes;
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const GValue *phases;
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const GValue *mag, *phase;
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gdouble freq;
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guint i;
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if (!gst_structure_get_clock_time (s, "endtime", &endtime))
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endtime = GST_CLOCK_TIME_NONE;
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g_print ("New spectrum message, endtime %" GST_TIME_FORMAT "\n",
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GST_TIME_ARGS (endtime));
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magnitudes = gst_structure_get_value (s, "magnitude");
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phases = gst_structure_get_value (s, "phase");
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for (i = 0; i < spect_bands; ++i) {
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freq = (gdouble) ((AUDIOFREQ / 2) * i + AUDIOFREQ / 4) / spect_bands;
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mag = gst_value_list_get_value (magnitudes, i);
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phase = gst_value_list_get_value (phases, i);
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if (mag != NULL && phase != NULL) {
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g_print ("band %d (freq %g): magnitude %f dB phase %f\n", i, freq,
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g_value_get_float (mag), g_value_get_float (phase));
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}
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}
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g_print ("\n");
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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, *audioconvert, *spectrum, *sink;
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GstBus *bus;
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GstCaps *caps;
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GMainLoop *loop;
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gst_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), "wave", 0, "freq", 6000.0, NULL);
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audioconvert = gst_element_factory_make ("audioconvert", NULL);
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g_assert (audioconvert);
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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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"message", TRUE, "message-phase", TRUE, NULL);
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sink = gst_element_factory_make ("fakesink", "sink");
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g_object_set (G_OBJECT (sink), "sync", TRUE, NULL);
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gst_bin_add_many (GST_BIN (bin), src, audioconvert, spectrum, sink, NULL);
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caps = gst_caps_new_simple ("audio/x-raw",
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"rate", G_TYPE_INT, AUDIOFREQ, NULL);
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if (!gst_element_link (src, audioconvert) ||
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!gst_element_link_filtered (audioconvert, spectrum, caps) ||
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!gst_element_link (spectrum, sink)) {
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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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gst_caps_unref (caps);
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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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gst_element_set_state (bin, GST_STATE_PLAYING);
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/* we need to run a GLib main loop to get the messages */
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loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (loop);
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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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