common/: a simple py script to generate valid xml from a C example probably...

common/: a simple py script to generate valid xml from a C example probably also need to strip an MIT license when we...

Original commit message from CVS:

* common/c-to-xml.py:
* common/gtk-doc-plugins.mak:
a simple py script to generate valid xml from a C example
probably also need to strip an MIT license when we decide
* docs/plugins/Makefile.am:
* gst/level/Makefile.am:
* gst/level/gstlevel.c: (gst_level_init):
* gst/level/level-example.c: (message_handler), (main):
add an example to level that will show up in the docs
* gst/rtp/TODO:
add a note for the future
parent 1b61a0a3
2005-09-14 Thomas Vander Stichele <thomas at apestaart dot org>
* common/c-to-xml.py:
* common/gtk-doc-plugins.mak:
a simple py script to generate valid xml from a C example
probably also need to strip an MIT license when we decide
* docs/plugins/Makefile.am:
* gst/level/Makefile.am:
* gst/level/gstlevel.c: (gst_level_init):
* gst/level/level-example.c: (message_handler), (main):
add an example to level that will show up in the docs
* gst/rtp/TODO:
add a note for the future
2005-09-14 Michael Smith <msmith@fluendo.com>
* gst/wavenc/gstwavenc.c: (gst_wavenc_class_init):
......
common @ 22ed1176
Subproject commit 30a1fc4dc24133cc411e0232af87790ae2f845b2
Subproject commit 22ed11765884ef97b7346f0723ffc0e7fe540640
......@@ -77,6 +77,10 @@ EXTRA_HFILES = \
$(top_srcdir)/gst/level/gstlevel.h \
$(top_srcdir)/gst/goom/gstgoom.h
# example code that needs to be converted to xml and placed in xml/
EXAMPLE_CFILES = \
$(top_srcdir)/gst/level/level-example.c
# Images to copy into HTML directory.
HTML_IMAGES =
......
......@@ -6,3 +6,7 @@ libgstlevel_la_LIBADD = $(GST_BASE_LIBS)
libgstlevel_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = gstlevel.h
noinst_PROGRAMS = level-example
level_example_CFLAGS = $(GST_CFLAGS)
level_example_LDADD = $(GST_LIBS)
......@@ -19,6 +19,38 @@
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-level
*
* <refsect2>
* <para>
* Level analyses incoming audio buffers and generates an application
* message per given interval of time.
* The message's structure contains four fields:
* <itemizedlist>
* <listitem>
* <para>
* <link linkend="gdouble">gdouble</link>
* <classname>&quot;endtime&quot;</classname>:
* the end time of the buffer that
* triggered the message</para>
* </listitem>
* <listitem>
* <para>
* <link linkend="gdouble">gdouble</link>
* <classname>&quot;endtime&quot;</classname>:
* the end time of the buffer that
* triggered the message</para>
* </listitem>
* </itemizedlist>
* </para>
* <title>Example application</title>
* <para>
* <include xmlns="http://www.w3.org/2003/XInclude" href="element-level-example.xml" />
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
......@@ -146,6 +178,8 @@ gst_level_init (GstLevel * filter, GstLevelClass * g_class)
filter->interval = 0.1;
filter->decay_peak_ttl = 0.4;
filter->decay_peak_falloff = 10.0; /* dB falloff (/sec) */
filter->message = TRUE;
}
static void
......@@ -257,6 +291,9 @@ gst_level_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
* samples for multiple channels are interleaved
* input sample data enters in *in_data as 8 or 16 bit data
* this filter only accepts signed audio data, so mid level is always 0
*
* for 16 bit, this code considers the non-existant 32768 value to be
* full-scale; so 32767 will not map to 1.0
*/
#define DEFINE_LEVEL_CALCULATOR(TYPE) \
......@@ -268,7 +305,7 @@ gst_level_calculate_##TYPE (TYPE * in, guint num, gint channels, \
double squaresum = 0.0; /* square sum of the integer samples */ \
register double square = 0.0; /* Square */ \
register double PSS = 0.0; /* Peak Square Sample */ \
gdouble normalizer; /* divisor to get a [-1, - 1] range */ \
gdouble normalizer; /* divisor to get a [-1.0, 1.0] range */ \
\
*CS = 0.0; /* Cumulative Square for this block */ \
\
......
#include <string.h>
#include <math.h>
#include <gst/gst.h>
gboolean
message_handler (GstBus * bus, GstMessage * message, gpointer data)
{
if (message->type == GST_MESSAGE_APPLICATION) {
const GstStructure *s = gst_message_get_structure (message);
const gchar *name = gst_structure_get_name (s);
if (strcmp (name, "level") == 0) {
gint channels;
gdouble endtime, rms_dB, peak_dB, decay_dB;
gdouble rms;
const GValue *list;
const GValue *value;
if (!gst_structure_get_double (s, "endtime", &endtime))
g_warning ("Could not parse endtime");
list = gst_structure_get_value (s, "rms");
/* we can get the number of channels as the length of any of the value
* lists */
channels = gst_value_list_get_size (list);
/* we will only get values for the first channel, since we know sinesrc
* is mono */
value = gst_value_list_get_value (list, 0);
rms_dB = g_value_get_double (value);
list = gst_structure_get_value (s, "peak");
value = gst_value_list_get_value (list, 0);
peak_dB = g_value_get_double (value);
list = gst_structure_get_value (s, "decay");
value = gst_value_list_get_value (list, 0);
decay_dB = g_value_get_double (value);
g_print ("endtime: %f, channels: %d\n", endtime, channels);
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 *sinesrc, *level, *fakesink;
GstElement *pipeline;
GstBus *bus;
gint watch_id;
GMainLoop *loop;
gst_init (&argc, &argv);
pipeline = gst_pipeline_new (NULL);
g_assert (pipeline);
sinesrc = gst_element_factory_make ("sinesrc", NULL);
g_assert (sinesrc);
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), sinesrc, level, fakesink, NULL);
gst_element_link (sinesrc, level);
gst_element_link (level, fakesink);
/* make sure we'll get messages */
g_object_set (G_OBJECT (level), "message", 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);
return 0;
}
......@@ -7,3 +7,5 @@
*For Video:
* payload_t
* sequence number should not start at 0, but randomly
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