gstreamer/gst/removesilence/gstremovesilence.c

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/* GStreamer
* Copyright (C) 2011 Tiago Katcipis <tiagokatcipis@gmail.com>
* Copyright (C) 2011 Paulo Pizarro <paulo.pizarro@gmail.com>
*
* 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.
*/
/**
* SECTION:element-removesilence
*
* Removes all silence periods from an audio stream, dropping silence buffers.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v -m filesrc location="audiofile" ! decodebin2 ! removesilence remove=true ! wavenc ! filesink location=without_audio.wav
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/controller/gstcontroller.h>
#include "gstremovesilence.h"
GST_DEBUG_CATEGORY_STATIC (gst_remove_silence_debug);
#define GST_CAT_DEFAULT gst_remove_silence_debug
#define DEFAULT_VAD_HYSTERESIS 480 /* 60 mseg */
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_REMOVE,
PROP_HYSTERESIS
};
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("audio/x-raw-int, "
"rate=[1, MAX], channels=1, endianness=BYTE_ORDER, "
"width=16, depth=16, signed=true"));
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("audio/x-raw-int, "
"rate=[1, MAX], channels=1, endianness=BYTE_ORDER, "
"width=16, depth=16, signed=true"));
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_remove_silence_debug, "removesilence", 0, "removesilence element")
GST_BOILERPLATE_FULL (GstRemoveSilence, gst_remove_silence, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
static void gst_remove_silence_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_remove_silence_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_remove_silence_transform_ip (GstBaseTransform * base,
GstBuffer * buf);
static void gst_remove_silence_finalize (GObject * obj);
static void gst_remove_silence_reset (GstRemoveSilence * filter);
/* GObject vmethod implementations */
static void
gst_remove_silence_base_init (gpointer gclass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
gst_element_class_set_details_simple (element_class,
"RemoveSilence",
"Filter/Effect/Audio",
"Removes all the silence periods from the audio stream.",
"Tiago Katcipis <tiagokatcipis@gmail.com>\n \
Paulo Pizarro <paulo.pizarro@gmail.com>");
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class,
&sink_template);
}
/* initialize the removesilence's class */
static void
gst_remove_silence_class_init (GstRemoveSilenceClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->finalize = gst_remove_silence_finalize;
gobject_class->set_property = gst_remove_silence_set_property;
gobject_class->get_property = gst_remove_silence_get_property;
g_object_class_install_property (gobject_class, PROP_REMOVE,
g_param_spec_boolean ("remove", "Remove",
"Set to true to remove silence from the stream, false otherwhise",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_HYSTERESIS,
g_param_spec_uint64 ("hysteresis",
"Hysteresis",
"Set the hysteresis (on samples) used on the internal VAD",
1, G_MAXUINT64, DEFAULT_VAD_HYSTERESIS, G_PARAM_READWRITE));
GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
GST_DEBUG_FUNCPTR (gst_remove_silence_transform_ip);
}
/* initialize the new element
* instantiate pads and add them to element
* set pad calback functions
* initialize instance structure
*/
static void
gst_remove_silence_init (GstRemoveSilence * filter,
GstRemoveSilenceClass * gclass)
{
filter->vad = vad_new (DEFAULT_VAD_HYSTERESIS);
filter->remove = FALSE;
if (!filter->vad) {
GST_DEBUG ("Error initializing VAD !!");
return;
}
gst_remove_silence_reset (filter);
}
static void
gst_remove_silence_reset (GstRemoveSilence * filter)
{
GST_DEBUG ("Reseting VAD");
if (filter->vad) {
vad_reset (filter->vad);
}
GST_DEBUG ("VAD Reseted");
}
static void
gst_remove_silence_finalize (GObject * obj)
{
GstRemoveSilence *filter = GST_REMOVE_SILENCE (obj);
GST_DEBUG ("Destroying VAD");
vad_destroy (filter->vad);
filter->vad = NULL;
GST_DEBUG ("VAD Destroyed");
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_remove_silence_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRemoveSilence *filter = GST_REMOVE_SILENCE (object);
switch (prop_id) {
case PROP_REMOVE:
filter->remove = g_value_get_boolean (value);
break;
case PROP_HYSTERESIS:
vad_set_hysteresis (filter->vad, g_value_get_uint64 (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_remove_silence_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRemoveSilence *filter = GST_REMOVE_SILENCE (object);
switch (prop_id) {
case PROP_REMOVE:
g_value_set_boolean (value, filter->remove);
break;
case PROP_HYSTERESIS:
g_value_set_uint64 (value, vad_get_hysteresis (filter->vad));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_remove_silence_transform_ip (GstBaseTransform * trans, GstBuffer * inbuf)
{
GstRemoveSilence *filter = NULL;
int frame_type;
filter = GST_REMOVE_SILENCE (trans);
frame_type =
vad_update (filter->vad, (gint16 *) GST_BUFFER_DATA (inbuf),
GST_BUFFER_SIZE (inbuf) / sizeof (gint16));
if (frame_type == VAD_SILENCE) {
GST_DEBUG ("Silence detected");
if (filter->remove) {
GST_DEBUG ("Removing silence");
return GST_BASE_TRANSFORM_FLOW_DROPPED;
}
}
return GST_FLOW_OK;
}
/*Plugin init functions*/
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "removesilence", GST_RANK_NONE,
gst_remove_silence_get_type ());
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"removesilence",
"Removes silence from an audio stream",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);