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-rw-r--r--tests/examples/level/Makefile.am4
-rwxr-xr-xtests/examples/level/Makefile.in834
-rw-r--r--tests/examples/level/level-example.c140
3 files changed, 978 insertions, 0 deletions
diff --git a/tests/examples/level/Makefile.am b/tests/examples/level/Makefile.am
new file mode 100644
index 0000000..67ca719
--- /dev/null
+++ b/tests/examples/level/Makefile.am
@@ -0,0 +1,4 @@
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+level_example_LDADD = $(GST_LIBS) $(LIBM)
+
diff --git a/tests/examples/level/Makefile.in b/tests/examples/level/Makefile.in
new file mode 100755
index 0000000..c6b6def
--- /dev/null
+++ b/tests/examples/level/Makefile.in
@@ -0,0 +1,834 @@
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/tests/examples/level/level-example.c b/tests/examples/level/level-example.c
new file mode 100644
index 0000000..a953176
--- /dev/null
+++ b/tests/examples/level/level-example.c
@@ -0,0 +1,140 @@
+/* GStreamer
+ * Copyright (C) 2000,2001,2002,2003,2005
+ * Thomas Vander Stichele <thomas at apestaart dot org>
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <string.h>
+#include <math.h>
+
+#define GLIB_DISABLE_DEPRECATION_WARNINGS
+
+#include <gst/gst.h>
+
+static 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);
+
+ if (strcmp (name, "level") == 0) {
+ gint channels;
+ GstClockTime endtime;
+ gdouble rms_dB, peak_dB, decay_dB;
+ gdouble rms;
+ const GValue *array_val;
+ const GValue *value;
+ GValueArray *rms_arr, *peak_arr, *decay_arr;
+ gint i;
+
+ if (!gst_structure_get_clock_time (s, "endtime", &endtime))
+ g_warning ("Could not parse endtime");
+
+ /* the values are packed into GValueArrays with the value per channel */
+ array_val = gst_structure_get_value (s, "rms");
+ rms_arr = (GValueArray *) g_value_get_boxed (array_val);
+
+ array_val = gst_structure_get_value (s, "peak");
+ peak_arr = (GValueArray *) g_value_get_boxed (array_val);
+
+ array_val = gst_structure_get_value (s, "decay");
+ decay_arr = (GValueArray *) g_value_get_boxed (array_val);
+
+ /* we can get the number of channels as the length of any of the value
+ * arrays */
+ channels = rms_arr->n_values;
+ g_print ("endtime: %" GST_TIME_FORMAT ", channels: %d\n",
+ GST_TIME_ARGS (endtime), channels);
+ for (i = 0; i < channels; ++i) {
+
+ g_print ("channel %d\n", i);
+ value = g_value_array_get_nth (rms_arr, i);
+ rms_dB = g_value_get_double (value);
+
+ value = g_value_array_get_nth (peak_arr, i);
+ peak_dB = g_value_get_double (value);
+
+ value = g_value_array_get_nth (decay_arr, i);
+ decay_dB = g_value_get_double (value);
+ g_print (" RMS: %f dB, peak: %f dB, decay: %f dB\n",
+ rms_dB, peak_dB, decay_dB);
+
+ /* converting from dB to normal gives us a value between 0.0 and 1.0 */
+ rms = pow (10, rms_dB / 20);
+ g_print (" normalized rms value: %f\n", rms);
+ }
+ }
+ }
+ /* we handled the message we want, and ignored the ones we didn't want.
+ * so the core can unref the message for us */
+ return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+ GstElement *audiotestsrc, *audioconvert, *level, *fakesink;
+ GstElement *pipeline;
+ GstCaps *caps;
+ GstBus *bus;
+ guint watch_id;
+ GMainLoop *loop;
+
+ gst_init (&argc, &argv);
+
+ caps = gst_caps_from_string ("audio/x-raw,channels=2");
+
+ pipeline = gst_pipeline_new (NULL);
+ g_assert (pipeline);
+ audiotestsrc = gst_element_factory_make ("audiotestsrc", NULL);
+ g_assert (audiotestsrc);
+ audioconvert = gst_element_factory_make ("audioconvert", NULL);
+ g_assert (audioconvert);
+ level = gst_element_factory_make ("level", NULL);
+ g_assert (level);
+ fakesink = gst_element_factory_make ("fakesink", NULL);
+ g_assert (fakesink);
+
+ gst_bin_add_many (GST_BIN (pipeline), audiotestsrc, audioconvert, level,
+ fakesink, NULL);
+ if (!gst_element_link (audiotestsrc, audioconvert))
+ g_error ("Failed to link audiotestsrc and audioconvert");
+ if (!gst_element_link_filtered (audioconvert, level, caps))
+ g_error ("Failed to link audioconvert and level");
+ if (!gst_element_link (level, fakesink))
+ g_error ("Failed to link level and fakesink");
+
+ /* make sure we'll get messages */
+ g_object_set (G_OBJECT (level), "post-messages", TRUE, NULL);
+ /* run synced and not as fast as we can */
+ g_object_set (G_OBJECT (fakesink), "sync", TRUE, NULL);
+
+ bus = gst_element_get_bus (pipeline);
+ watch_id = gst_bus_add_watch (bus, message_handler, NULL);
+
+ gst_element_set_state (pipeline, 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);
+
+ g_source_remove (watch_id);
+ g_main_loop_unref (loop);
+ return 0;
+}