gstreamer/gst/level/gstlevel.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 <gst/gst.h>
#include "gstlevel.h"
#include "math.h"
/* elementfactory information */
static GstElementDetails level_details = {
"Level",
"Filter/Audio/Analysis",
"LGPL",
"RMS Level indicator for audio/raw",
VERSION,
"Thomas <thomas@apestaart.org>",
"(C) 2001",
};
/* Filter signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0
};
static GstPadTemplate*
level_src_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template) {
template = gst_pad_template_new (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/raw",
gst_props_new (
"channels", GST_PROPS_INT_RANGE (1, 2),
NULL)),
NULL);
}
return template;
}
static GstPadTemplate*
level_sink_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template) {
template = gst_pad_template_new (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/raw",
gst_props_new (
"channels", GST_PROPS_INT_RANGE (1, 2),
NULL)),
NULL);
}
return template;
}
static void gst_level_class_init (GstLevelClass *klass);
static void gst_level_init (GstLevel *filter);
static void gst_level_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_level_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_level_chain (GstPad *pad, GstBuffer *buf);
static void inline gst_level_fast_16bit_chain (gint16* data, gint16** out_data,
guint numsamples);
static void inline gst_level_fast_8bit_chain (gint8* data, gint8** out_data,
guint numsamples);
static GstElementClass *parent_class = NULL;
/*static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_level_get_type (void)
{
static GType level_type = 0;
if (!level_type)
{
static const GTypeInfo level_info =
{
sizeof (GstLevelClass), NULL, NULL,
(GClassInitFunc) gst_level_class_init, NULL, NULL,
sizeof (GstLevel), 0,
(GInstanceInitFunc) gst_level_init
};
level_type = g_type_register_static (GST_TYPE_ELEMENT, "GstLevel",
&level_info, 0);
}
return level_type;
}
static GstPadLinkReturn
gst_level_connect (GstPad *pad, GstCaps *caps)
{
GstLevel *filter;
GstPad *otherpad;
filter = GST_LEVEL (gst_pad_get_parent (pad));
g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_IS_LEVEL (filter), GST_PAD_LINK_REFUSED);
otherpad = (pad == filter->srcpad ? filter->sinkpad : filter->srcpad);
if (GST_CAPS_IS_FIXED (caps))
{
/*if ( !volume_parse_caps (filter, caps) || */
return gst_pad_try_set_caps (otherpad, caps);
}
return GST_PAD_LINK_DELAYED;
}
static void
gst_level_chain (GstPad *pad, GstBuffer *buf)
{
GstLevel *filter;
gint16 *in_data;
gint16 *out_data;
GstBuffer* outbuf;
gint width;
GstCaps *caps;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
filter = GST_LEVEL (GST_OBJECT_PARENT (pad));
g_return_if_fail (filter != NULL);
g_return_if_fail (GST_IS_LEVEL (filter));
caps = NULL;
caps = GST_PAD_CAPS (pad);
if (caps == NULL)
{
/* FIXME : Please change this to a better warning method ! */
g_error ("WARNING: level: Could not get pad caps - caps nego failed !\n");
}
gst_caps_get_int (caps, "width", &width);
in_data = (gint16 *) GST_BUFFER_DATA(buf);
outbuf = gst_buffer_new();
GST_BUFFER_DATA (outbuf) = (gchar *) g_new (gint16,
GST_BUFFER_SIZE (buf) / 2);
GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf);
out_data = (gint16 *) GST_BUFFER_DATA (outbuf);
g_print ("%s: ", gst_element_get_name (GST_ELEMENT (filter)));
switch (width) {
case 16:
gst_level_fast_16bit_chain (in_data, &out_data,
GST_BUFFER_SIZE (buf) / 2);
break;
case 8:
gst_level_fast_8bit_chain ((gint8 *) in_data,
(gint8 **) &out_data, GST_BUFFER_SIZE(buf));
break;
}
gst_buffer_unref (buf);
gst_pad_push (filter->srcpad,outbuf);
}
static void inline
gst_level_fast_16bit_chain (gint16* in_data, gint16** out_data,
guint num_samples)
#include "filter.func"
static void inline
gst_level_fast_8bit_chain (gint8* in_data, gint8** out_data,
guint num_samples)
#include "filter.func"
static void
gst_level_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstLevel *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_LEVEL (object));
filter = GST_LEVEL (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_level_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstLevel *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_LEVEL (object));
filter = GST_LEVEL (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_level_class_init (GstLevelClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*) klass;
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property = gst_level_set_property;
gobject_class->get_property = gst_level_get_property;
}
static void
gst_level_init (GstLevel *filter)
{
filter->sinkpad = gst_pad_new_from_template (level_sink_factory (), "sink");
gst_pad_set_link_function (filter->sinkpad, gst_level_connect);
filter->srcpad = gst_pad_new_from_template (level_src_factory (), "src");
gst_pad_set_link_function (filter->srcpad, gst_level_connect);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_pad_set_chain_function (filter->sinkpad, gst_level_chain);
filter->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new ("level", GST_TYPE_LEVEL,
&level_details);
g_return_val_if_fail (factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, level_src_factory ());
gst_element_factory_add_pad_template (factory, level_sink_factory ());
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"level",
plugin_init
};