gstreamer/gst/rtpmanager/gstrtprtxqueue.c

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/* RTP Retransmission queue element for GStreamer
*
* gstrtprtxqueue.c:
*
* Copyright (C) 2013 Wim Taymans <wim.taymans@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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-rtprtxqueue
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <string.h>
#include "gstrtprtxqueue.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_rtx_queue_debug);
#define GST_CAT_DEFAULT gst_rtp_rtx_queue_debug
enum
{
PROP_0,
PROP_LAST
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static gboolean gst_rtp_rtx_queue_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_rtp_rtx_queue_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstStateChangeReturn gst_rtp_rtx_queue_change_state (GstElement *
element, GstStateChange transition);
static void gst_rtp_rtx_queue_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_rtx_queue_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rtp_rtx_queue_finalize (GObject * object);
G_DEFINE_TYPE (GstRTPRtxQueue, gst_rtp_rtx_queue, GST_TYPE_ELEMENT);
static void
gst_rtp_rtx_queue_class_init (GstRTPRtxQueueClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_static_metadata (gstelement_class,
"RTP Retransmission Queue", "Codec",
"Keep RTP packets in a queue for retransmission",
"Wim Taymans <wim.taymans@gmail.com>");
gobject_class->get_property = gst_rtp_rtx_queue_get_property;
gobject_class->set_property = gst_rtp_rtx_queue_set_property;
gobject_class->finalize = gst_rtp_rtx_queue_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_rtp_rtx_queue_change_state);
}
static void
gst_rtp_rtx_queue_finalize (GObject * object)
{
GstRTPRtxQueue *rtx = GST_RTP_RTX_QUEUE (object);
g_queue_free (rtx->queue);
G_OBJECT_CLASS (gst_rtp_rtx_queue_parent_class)->finalize (object);
}
static void
gst_rtp_rtx_queue_init (GstRTPRtxQueue * rtx)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtx);
rtx->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
GST_PAD_SET_PROXY_CAPS (rtx->srcpad);
GST_PAD_SET_PROXY_ALLOCATION (rtx->srcpad);
gst_pad_set_event_function (rtx->srcpad,
GST_DEBUG_FUNCPTR (gst_rtp_rtx_queue_src_event));
gst_element_add_pad (GST_ELEMENT (rtx), rtx->srcpad);
rtx->sinkpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"sink"), "sink");
GST_PAD_SET_PROXY_CAPS (rtx->sinkpad);
GST_PAD_SET_PROXY_ALLOCATION (rtx->sinkpad);
gst_pad_set_chain_function (rtx->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_rtx_queue_chain));
gst_element_add_pad (GST_ELEMENT (rtx), rtx->sinkpad);
rtx->queue = g_queue_new ();
}
typedef struct
{
GstRTPRtxQueue *rtx;
guint seqnum;
} RTXData;
static void
push_seqnum (GstBuffer * buffer, RTXData * data)
{
GstRTPRtxQueue *rtx = data->rtx;
GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
guint16 seqnum;
if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtpbuffer))
return;
seqnum = gst_rtp_buffer_get_seq (&rtpbuffer);
gst_rtp_buffer_unmap (&rtpbuffer);
if (seqnum == data->seqnum) {
gst_pad_push (rtx->srcpad, gst_buffer_ref (buffer));
}
}
static gboolean
gst_rtp_rtx_queue_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRTPRtxQueue *rtx = GST_RTP_RTX_QUEUE (parent);
gboolean res;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
const GstStructure *s;
s = gst_event_get_structure (event);
if (gst_structure_has_name (s, "GstRTPRetransmissionRequest")) {
guint seqnum;
RTXData data;
if (!gst_structure_get_uint (s, "seqnum", &seqnum))
seqnum = -1;
data.rtx = rtx;
data.seqnum = seqnum;
g_queue_foreach (rtx->queue, (GFunc) push_seqnum, &data);
gst_event_unref (event);
res = TRUE;
} else {
res = gst_pad_event_default (pad, parent, event);
}
break;
}
default:
res = gst_pad_event_default (pad, parent, event);
break;
}
return res;
}
static GstFlowReturn
gst_rtp_rtx_queue_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstRTPRtxQueue *rtx;
GstFlowReturn ret;
rtx = GST_RTP_RTX_QUEUE (parent);
g_queue_push_head (rtx->queue, gst_buffer_ref (buffer));
while (g_queue_get_length (rtx->queue) > 100) {
gst_buffer_unref (g_queue_pop_tail (rtx->queue));
}
ret = gst_pad_push (rtx->srcpad, buffer);
return ret;
}
static void
gst_rtp_rtx_queue_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_rtx_queue_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_rtp_rtx_queue_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
switch (transition) {
default:
break;
}
ret =
GST_ELEMENT_CLASS (gst_rtp_rtx_queue_parent_class)->change_state (element,
transition);
switch (transition) {
default:
break;
}
return ret;
}
gboolean
gst_rtp_rtx_queue_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_rtp_rtx_queue_debug, "rtprtxqueue", 0,
"rtp retransmission queue");
return gst_element_register (plugin, "rtprtxqueue", GST_RANK_NONE,
GST_TYPE_RTP_RTX_QUEUE);
}