From 1ba01acdc040bd21dc2219ec17d7b331eee40078 Mon Sep 17 00:00:00 2001 From: Jan Schmidt Date: Sat, 9 Feb 2008 01:45:32 +0000 Subject: Add a simple example application for the spectrum element, include it in the docs, and fix some documentation ambigui... Original commit message from CVS: * docs/plugins/Makefile.am: * gst/spectrum/gstspectrum.c: * tests/examples/spectrum/.cvsignore: * tests/examples/spectrum/Makefile.am: * tests/examples/spectrum/spectrum-example.c: Add a simple example application for the spectrum element, include it in the docs, and fix some documentation ambiguities. Fixes: #348085 --- tests/examples/spectrum/.gitignore | 1 + tests/examples/spectrum/Makefile.am | 6 +- tests/examples/spectrum/spectrum-example.c | 122 +++++++++++++++++++++++++++++ 3 files changed, 128 insertions(+), 1 deletion(-) create mode 100644 tests/examples/spectrum/spectrum-example.c (limited to 'tests/examples') diff --git a/tests/examples/spectrum/.gitignore b/tests/examples/spectrum/.gitignore index d1d65d58..8e5a3cf9 100644 --- a/tests/examples/spectrum/.gitignore +++ b/tests/examples/spectrum/.gitignore @@ -1,2 +1,3 @@ demo-audiotest demo-osssrc +spectrum-example diff --git a/tests/examples/spectrum/Makefile.am b/tests/examples/spectrum/Makefile.am index 0fd2ef17..a0a71629 100644 --- a/tests/examples/spectrum/Makefile.am +++ b/tests/examples/spectrum/Makefile.am @@ -1,5 +1,5 @@ if HAVE_GTK -noinst_PROGRAMS = demo-osssrc demo-audiotest +noinst_PROGRAMS = demo-osssrc demo-audiotest spectrum-example endif demo_osssrc_SOURCES = demo-osssrc.c @@ -10,3 +10,7 @@ demo_audiotest_SOURCES = demo-audiotest.c demo_audiotest_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GTK_CFLAGS) demo_audiotest_LDFLAGS = $(GST_BASE_LIBS) $(GST_LIBS) $(GTK_LIBS) +spectrum_example_SOURCES = spectrum-example.c +spectrum_example_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GTK_CFLAGS) +spectrum_example_LDFLAGS = $(GST_BASE_LIBS) $(GST_LIBS) $(GTK_LIBS) + diff --git a/tests/examples/spectrum/spectrum-example.c b/tests/examples/spectrum/spectrum-example.c new file mode 100644 index 00000000..7c20e279 --- /dev/null +++ b/tests/examples/spectrum/spectrum-example.c @@ -0,0 +1,122 @@ +/* GStreamer + * Copyright (C) 2006 Stefan Kost + * Copyright (C) 2008 Jan Schmidt + * + * 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. + */ + +#include +#include + +static guint spect_bands = 20; + +#define AUDIOFREQ 32000 + +/* receive spectral data from element message */ +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); + GstClockTime endtime; + + if (strcmp (name, "spectrum") == 0) { + const GValue *magnitudes; + const GValue *phases; + const GValue *mag, *phase; + gdouble freq; + guint i; + + if (!gst_structure_get_clock_time (s, "endtime", &endtime)) + endtime = GST_CLOCK_TIME_NONE; + + g_print ("New spectrum message, endtime %" GST_TIME_FORMAT "\n", + GST_TIME_ARGS (endtime)); + + magnitudes = gst_structure_get_value (s, "magnitude"); + phases = gst_structure_get_value (s, "phase"); + + for (i = 0; i < spect_bands; ++i) { + freq = (gdouble) ((AUDIOFREQ / 2) * i + AUDIOFREQ / 4) / spect_bands; + mag = gst_value_list_get_value (magnitudes, i); + phase = gst_value_list_get_value (phases, i); + + if (mag != NULL && phase != NULL) { + g_print ("band %d (freq %g): magnitude %f dB phase %f\n", i, freq, + g_value_get_float (mag), g_value_get_float (phase)); + } + } + g_print ("\n"); + } + } + return TRUE; +} + +int +main (int argc, char *argv[]) +{ + GstElement *bin; + GstElement *src, *audioconvert, *spectrum, *sink; + GstBus *bus; + GstCaps *caps; + GMainLoop *loop; + + gst_init (&argc, &argv); + + bin = gst_pipeline_new ("bin"); + + src = gst_element_factory_make ("audiotestsrc", "src"); + g_object_set (G_OBJECT (src), "wave", 0, "freq", 6000.0, NULL); + audioconvert = gst_element_factory_make ("audioconvert", NULL); + g_assert (audioconvert); + + spectrum = gst_element_factory_make ("spectrum", "spectrum"); + g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80, + "message", TRUE, "message-phase", TRUE, NULL); + + sink = gst_element_factory_make ("fakesink", "sink"); + g_object_set (G_OBJECT (sink), "sync", TRUE, NULL); + + gst_bin_add_many (GST_BIN (bin), src, audioconvert, spectrum, sink, NULL); + + caps = gst_caps_new_simple ("audio/x-raw-int", + "rate", G_TYPE_INT, AUDIOFREQ, NULL); + + if (!gst_element_link (src, audioconvert) || + !gst_element_link_filtered (audioconvert, spectrum, caps) || + !gst_element_link (spectrum, sink)) { + fprintf (stderr, "can't link elements\n"); + exit (1); + } + gst_caps_unref (caps); + + bus = gst_element_get_bus (bin); + gst_bus_add_watch (bus, message_handler, NULL); + gst_object_unref (bus); + + gst_element_set_state (bin, GST_STATE_PLAYING); + + /* we need to run a GLib main loop to get the messages */ + loop = g_main_loop_new (NULL, FALSE); + g_main_loop_run (loop); + + gst_element_set_state (bin, GST_STATE_NULL); + + gst_object_unref (bin); + + return 0; +} -- cgit