/* GStreamer * Copyright (C) 2011 Tiago Katcipis * Copyright (C) 2011 Paulo Pizarro * * 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. * * * Example launch line * |[ * gst-launch -v -m filesrc location="audiofile" ! decodebin2 ! removesilence remove=true ! wavenc ! filesink location=without_audio.wav * ]| * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #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 \n \ Paulo Pizarro "); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&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);