gstreamer/gst/rtpmanager/gstrtpdtmfmux.c

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/* RTP DTMF muxer element for GStreamer
*
* gstrtpdtmfmux.c:
*
* Copyright (C) <2007> Nokia Corporation.
* Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000,2005 Wim Taymans <wim@fluendo.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-rtpdtmfmux
* @short_description: mixes RTP DTMF streams into other RTP streams
* <refsect2>
* <para>
* The RTPDTMFMuxer mixes/muxes RTP DTMF stream(s) into other RTP
* streams. It does exactly what it's parent (RTPMuxer) does, except
* that it allows upstream peer elements to request exclusive access
* to the stream, which is required by the RTP DTMF standards (see RFC
* 2833, section 3.2, para 1 for details). The peer upstream element
* requests the acquisition and release of a stream lock beginning
* using custom downstream gstreamer events. To request the acquisition
* of the lock, the peer element must send an event of type
* GST_EVENT_CUSTOM_DOWNSTREAM_OOB, having a
* structure of name "stream-lock" with only one boolean field:
* "lock". If this field is set to TRUE, the request is for the
* acquisition of the lock, otherwise it is for release of the lock.
* </para>
* <para>For example, the following code in an upstream peer element
* requests the acquisition of the stream lock:
* </para>
* <para>
* <programlisting>
* GstEvent *event;
* GstStructure *structure;
* GstPad *srcpad;
*
* ... /\* srcpad initialization goes here \*\/
*
* structure = gst_structure_new ("stream-lock",
* "lock", G_TYPE_BOOLEAN, TRUE, NULL);
*
* event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM_OOB, structure);
* gst_pad_push_event (dtmfsrc->srcpad, event);
* </programlisting>
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gstrtpdtmfmux.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_rtp_dtmf_mux_debug);
#define GST_CAT_DEFAULT gst_rtp_dtmf_mux_debug
/* elementfactory information */
static const GstElementDetails gst_rtp_dtmf_mux_details =
GST_ELEMENT_DETAILS ("RTP muxer",
"Codec/Muxer",
"mixes RTP DTMF streams into other RTP streams",
"Zeeshan Ali <first.last@nokia.com>");
static void gst_rtp_dtmf_mux_base_init (gpointer g_class);
static void gst_rtp_dtmf_mux_class_init (GstRTPDTMFMuxClass * klass);
static void gst_rtp_dtmf_mux_finalize (GObject * object);
static gboolean gst_rtp_dtmf_mux_sink_event (GstPad * pad,
GstEvent * event);
static GstFlowReturn gst_rtp_dtmf_mux_chain (GstPad * pad,
GstBuffer * buffer);
static GstRTPMuxClass *parent_class = NULL;
GType
gst_rtp_dtmf_mux_get_type (void)
{
static GType mux_type = 0;
if (!mux_type) {
static const GTypeInfo mux_info = {
sizeof (GstRTPDTMFMuxClass),
gst_rtp_dtmf_mux_base_init,
NULL,
(GClassInitFunc) gst_rtp_dtmf_mux_class_init,
NULL,
NULL,
sizeof (GstRTPDTMFMux),
0,
(GInstanceInitFunc) NULL,
};
mux_type =
g_type_register_static (GST_TYPE_RTP_MUX, "GstRTPDTMFMux",
&mux_info, 0);
}
return mux_type;
}
static void
gst_rtp_dtmf_mux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_rtp_dtmf_mux_details);
}
static void
gst_rtp_dtmf_mux_class_init (GstRTPDTMFMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPMuxClass *gstrtpmux_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpmux_class = (GstRTPMuxClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_rtp_dtmf_mux_finalize;
gstrtpmux_class->chain_func = gst_rtp_dtmf_mux_chain;
gstrtpmux_class->sink_event_func = gst_rtp_dtmf_mux_sink_event;
}
static void
gst_rtp_dtmf_mux_finalize (GObject * object)
{
GstRTPDTMFMux *mux;
mux = GST_RTP_DTMF_MUX (object);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstFlowReturn
gst_rtp_dtmf_mux_chain (GstPad * pad, GstBuffer * buffer)
{
GstRTPDTMFMux *mux;
GstFlowReturn ret;
mux = GST_RTP_DTMF_MUX (gst_pad_get_parent (pad));
GST_OBJECT_LOCK (mux);
if (mux->special_pad != NULL && mux->special_pad != pad) {
/* Drop the buffer */
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
GST_OBJECT_UNLOCK (mux);
}
else {
GST_OBJECT_UNLOCK (mux);
if (parent_class->chain_func)
ret = parent_class->chain_func (pad, buffer);
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else {
gst_buffer_unref (buffer);
ret = GST_FLOW_ERROR;
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}
}
gst_object_unref (mux);
return ret;
}
static void
gst_rtp_dtmf_mux_lock_stream (GstRTPDTMFMux *mux, GstPad * pad)
{
if (mux->special_pad != NULL)
GST_WARNING_OBJECT (mux,
"Stream lock already acquired by pad %s",
GST_ELEMENT_NAME (mux->special_pad));
else {
GST_DEBUG_OBJECT (mux,
"Stream lock acquired by pad %s",
GST_ELEMENT_NAME (pad));
mux->special_pad = gst_object_ref (pad);
}
}
static void
gst_rtp_dtmf_mux_unlock_stream (GstRTPDTMFMux *mux, GstPad * pad)
{
if (mux->special_pad == NULL)
GST_WARNING_OBJECT (mux,
"Stream lock not acquired, can't release it");
else if (pad != mux->special_pad)
GST_WARNING_OBJECT (mux,
"pad %s attempted to release Stream lock"
" which was acquired by pad %s", GST_ELEMENT_NAME (pad),
GST_ELEMENT_NAME (mux->special_pad));
else {
GST_DEBUG_OBJECT (mux,
"Stream lock released by pad %s",
GST_ELEMENT_NAME (mux->special_pad));
gst_object_unref (mux->special_pad);
mux->special_pad = NULL;
}
}
static gboolean
gst_rtp_dtmf_mux_handle_stream_lock_event (GstRTPDTMFMux *mux, GstPad * pad,
const GstStructure * event_structure)
{
gboolean lock;
if (!gst_structure_get_boolean (event_structure, "lock", &lock))
return FALSE;
GST_OBJECT_LOCK (mux);
if (lock)
gst_rtp_dtmf_mux_lock_stream (mux, pad);
else
gst_rtp_dtmf_mux_unlock_stream (mux, pad);
GST_OBJECT_UNLOCK (mux);
return TRUE;
}
static gboolean
gst_rtp_dtmf_mux_handle_downstream_event (GstRTPDTMFMux *mux,
GstPad * pad, GstEvent * event)
{
const GstStructure *structure;
gboolean ret = FALSE;
structure = gst_event_get_structure (event);
/* FIXME: is this event generic enough to be given a generic name? */
if (structure && gst_structure_has_name (structure, "stream-lock"))
ret = gst_rtp_dtmf_mux_handle_stream_lock_event (mux, pad, structure);
return ret;
}
static gboolean
gst_rtp_dtmf_mux_ignore_event (GstPad * pad, GstEvent * event)
{
gboolean ret;
if (parent_class->sink_event_func)
/* Give the parent a chance to handle the event first */
ret = parent_class->sink_event_func (pad, event);
else
ret = gst_pad_event_default (pad, event);
return ret;
}
static gboolean
gst_rtp_dtmf_mux_sink_event (GstPad * pad, GstEvent * event)
{
GstRTPDTMFMux *mux;
GstEventType type;
gboolean ret = FALSE;
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
mux = (GstRTPDTMFMux *) gst_pad_get_parent (pad);
switch (type) {
case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
ret = gst_rtp_dtmf_mux_handle_downstream_event (mux, pad, event);
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gst_event_unref (event);
break;
default:
ret = gst_rtp_dtmf_mux_ignore_event (pad, event);
break;
}
gst_object_unref (mux);
return ret;
}
gboolean
gst_rtp_dtmf_mux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_rtp_dtmf_mux_debug, "rtpdtmfmux", 0,
"rtp dtmf muxer");
return gst_element_register (plugin, "rtpdtmfmux", GST_RANK_NONE,
GST_TYPE_RTP_DTMF_MUX);
}