gstreamer/gst/rtpmux/gstrtpmux.c

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/* RTP muxer element for GStreamer
*
* gstrtpmux.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-rtpmux
*
* The rtp muxer takes multiple RTP streams having the same clock-rate and
* muxes into a single stream with a single SSRC.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <string.h>
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#include "gstrtpmux.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug);
#define GST_CAT_DEFAULT gst_rtp_mux_debug
enum
{
ARG_0,
PROP_TIMESTAMP_OFFSET,
PROP_SEQNUM_OFFSET,
PROP_SEQNUM,
PROP_SSRC
};
#define DEFAULT_TIMESTAMP_OFFSET -1
#define DEFAULT_SEQNUM_OFFSET -1
#define DEFAULT_SSRC -1
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typedef struct
{
gboolean have_clock_base;
guint clock_base;
GstCaps *out_caps;
} GstRTPMuxPadPrivate;
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_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstPad *gst_rtp_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad);
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static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_rtp_mux_getcaps (GstPad * pad);
static GstStateChangeReturn gst_rtp_mux_change_state (GstElement *
element, GstStateChange transition);
static void gst_rtp_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rtp_mux_dispose (GObject * object);
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GST_BOILERPLATE (GstRTPMux, gst_rtp_mux, GstElement, GST_TYPE_ELEMENT);
static void
gst_rtp_mux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (element_class, "RTP muxer",
"Codec/Muxer",
"multiplex N rtp streams into one", "Zeeshan Ali <first.last@nokia.com>");
}
static void
gst_rtp_mux_class_init (GstRTPMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->get_property = gst_rtp_mux_get_property;
gobject_class->set_property = gst_rtp_mux_set_property;
gobject_class->dispose = gst_rtp_mux_dispose;
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset",
"Timestamp Offset",
"Offset to add to all outgoing timestamps (-1 = random)", -1,
G_MAXINT, DEFAULT_TIMESTAMP_OFFSET, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET,
g_param_spec_int ("seqnum-offset", "Sequence number Offset",
"Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT,
DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM,
g_param_spec_uint ("seqnum", "Sequence number",
"The RTP sequence number of the last processed packet",
0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
g_param_spec_uint ("ssrc", "SSRC",
"The SSRC of the packets (-1 == random)",
0, G_MAXUINT, DEFAULT_SSRC, G_PARAM_READWRITE));
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gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_mux_request_new_pad);
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_rtp_mux_release_pad);
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_mux_change_state);
klass->chain_func = gst_rtp_mux_chain;
}
static void
gst_rtp_mux_dispose (GObject * object)
{
GList *item;
restart:
for (item = GST_ELEMENT_PADS (object); item; item = g_list_next (item)) {
GstPad *pad = GST_PAD (item->data);
if (GST_PAD_IS_SINK (pad)) {
gst_element_release_request_pad (GST_ELEMENT (object), pad);
goto restart;
}
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
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static gboolean
gst_rtp_mux_src_event (GstPad * pad, GstEvent * event)
{
GstElement *rtp_mux;
GstIterator *iter;
GstPad *sinkpad;
gboolean result = FALSE;
gboolean done = FALSE;
rtp_mux = gst_pad_get_parent_element (pad);
g_return_val_if_fail (rtp_mux != NULL, FALSE);
iter = gst_element_iterate_sink_pads (rtp_mux);
while (!done) {
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switch (gst_iterator_next (iter, (gpointer) & sinkpad)) {
case GST_ITERATOR_OK:
gst_event_ref (event);
result |= gst_pad_push_event (sinkpad, event);
gst_object_unref (sinkpad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (iter);
result = FALSE;
break;
case GST_ITERATOR_ERROR:
GST_WARNING_OBJECT (rtp_mux, "Error iterating sinkpads");
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
gst_iterator_free (iter);
gst_object_unref (rtp_mux);
gst_event_unref (event);
return result;
}
static void
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gst_rtp_mux_init (GstRTPMux * object, GstRTPMuxClass * g_class)
{
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (object);
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object->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
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gst_pad_set_event_function (object->srcpad,
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GST_DEBUG_FUNCPTR (gst_rtp_mux_src_event));
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gst_element_add_pad (GST_ELEMENT (object), object->srcpad);
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object->ssrc = DEFAULT_SSRC;
object->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
object->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
}
static GstPad *
gst_rtp_mux_create_sinkpad (GstRTPMux * rtp_mux, GstPadTemplate * templ,
const gchar * req_name)
{
GstPad *newpad = NULL;
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GstPadTemplate *class_templ;
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class_templ =
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (rtp_mux),
"sink_%d");
if (templ == class_templ) {
gchar *tmpname = NULL;
const gchar *name = NULL;
/* create new pad with the name */
if (req_name)
name = req_name;
else
name = tmpname = g_strdup_printf ("sink_%02d", rtp_mux->numpads);
newpad = gst_pad_new_from_template (templ, name);
g_free (tmpname);
rtp_mux->numpads++;
} else {
GST_WARNING_OBJECT (rtp_mux, "this is not our template!\n");
}
return newpad;
}
static void
gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad)
{
GstRTPMuxClass *klass;
GstRTPMuxPadPrivate *padpriv = g_slice_new0 (GstRTPMuxPadPrivate);
klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
/* setup some pad functions */
gst_pad_set_setcaps_function (sinkpad, gst_rtp_mux_setcaps);
gst_pad_set_getcaps_function (sinkpad, gst_rtp_mux_getcaps);
if (klass->chain_func)
gst_pad_set_chain_function (sinkpad, klass->chain_func);
if (klass->sink_event_func)
gst_pad_set_event_function (sinkpad, klass->sink_event_func);
/* This could break with gstreamer 0.10.9 */
gst_pad_set_active (sinkpad, TRUE);
gst_pad_set_element_private (sinkpad, padpriv);
/* dd the pad to the element */
gst_element_add_pad (GST_ELEMENT (rtp_mux), sinkpad);
}
static GstPad *
gst_rtp_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name)
{
GstRTPMux *rtp_mux;
GstPad *newpad;
g_return_val_if_fail (templ != NULL, NULL);
g_return_val_if_fail (GST_IS_RTP_MUX (element), NULL);
rtp_mux = GST_RTP_MUX (element);
if (templ->direction != GST_PAD_SINK) {
GST_WARNING_OBJECT (rtp_mux, "request pad that is not a SINK pad");
return NULL;
}
newpad = gst_rtp_mux_create_sinkpad (rtp_mux, templ, req_name);
if (newpad)
gst_rtp_mux_setup_sinkpad (rtp_mux, newpad);
else
GST_WARNING_OBJECT (rtp_mux, "failed to create request pad");
return newpad;
}
static void
gst_rtp_mux_release_pad (GstElement * element, GstPad * pad)
{
GstRTPMuxPadPrivate *padpriv;
GST_OBJECT_LOCK (element);
padpriv = gst_pad_get_element_private (pad);
gst_pad_set_element_private (pad, NULL);
GST_OBJECT_UNLOCK (element);
gst_element_remove_pad (element, pad);
if (padpriv) {
gst_caps_replace (&padpriv->out_caps, NULL);
g_slice_free (GstRTPMuxPadPrivate, padpriv);
}
}
/* Put our own clock-base on the buffer */
static void
gst_rtp_mux_readjust_rtp_timestamp (GstRTPMux * rtp_mux, GstPad * pad,
GstBuffer * buffer)
{
guint32 ts;
guint32 sink_ts_base = 0;
GstRTPMuxPadPrivate *padpriv;
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (padpriv && padpriv->have_clock_base)
sink_ts_base = padpriv->clock_base;
GST_OBJECT_UNLOCK (rtp_mux);
ts = gst_rtp_buffer_get_timestamp (buffer) - sink_ts_base + rtp_mux->ts_base;
GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u",
gst_rtp_buffer_get_timestamp (buffer), ts);
gst_rtp_buffer_set_timestamp (buffer, ts);
}
static GstFlowReturn
gst_rtp_mux_chain (GstPad * pad, GstBuffer * buffer)
{
GstRTPMux *rtp_mux;
GstFlowReturn ret;
GstRTPMuxPadPrivate *padpriv;
rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
if (!gst_rtp_buffer_validate (buffer)) {
GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer");
gst_object_unref (rtp_mux);
return GST_FLOW_ERROR;
}
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buffer = gst_buffer_make_writable (buffer);
GST_OBJECT_LOCK (rtp_mux);
rtp_mux->seqnum++;
gst_rtp_buffer_set_seq (buffer, rtp_mux->seqnum);
padpriv = gst_pad_get_element_private (pad);
if (padpriv)
gst_buffer_set_caps (buffer, padpriv->out_caps);
GST_OBJECT_UNLOCK (rtp_mux);
gst_rtp_buffer_set_ssrc (buffer, rtp_mux->current_ssrc);
gst_rtp_mux_readjust_rtp_timestamp (rtp_mux, pad, buffer);
GST_LOG_OBJECT (rtp_mux, "Pushing packet size %d, seq=%d, ts=%u",
GST_BUFFER_SIZE (buffer), rtp_mux->seqnum,
gst_rtp_buffer_get_timestamp (buffer));
if (!padpriv) {
ret = GST_FLOW_NOT_LINKED;
gst_buffer_unref (buffer);
goto out;
}
ret = gst_pad_push (rtp_mux->srcpad, buffer);
out:
gst_object_unref (rtp_mux);
return ret;
}
static gboolean
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gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps)
{
GstRTPMux *rtp_mux;
GstStructure *structure;
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gboolean ret = FALSE;
GstRTPMuxPadPrivate *padpriv;
rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
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if (!structure)
goto out;
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (padpriv &&
gst_structure_get_uint (structure, "clock-base", &padpriv->clock_base)) {
padpriv->have_clock_base = TRUE;
}
GST_OBJECT_UNLOCK (rtp_mux);
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caps = gst_caps_copy (caps);
gst_caps_set_simple (caps,
"clock-base", G_TYPE_UINT, rtp_mux->ts_base,
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"seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base, NULL);
GST_DEBUG_OBJECT (rtp_mux,
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"setting caps %" GST_PTR_FORMAT " on src pad..", caps);
ret = gst_pad_set_caps (rtp_mux->srcpad, caps);
if (rtp_mux->ssrc == -1) {
if (gst_structure_has_field_typed (structure, "ssrc", G_TYPE_UINT)) {
rtp_mux->current_ssrc = g_value_get_uint
(gst_structure_get_value (structure, "ssrc"));
}
}
if (ret) {
GST_OBJECT_LOCK (rtp_mux);
padpriv = gst_pad_get_element_private (pad);
if (padpriv)
gst_caps_replace (&padpriv->out_caps, caps);
GST_OBJECT_UNLOCK (rtp_mux);
}
gst_caps_unref (caps);
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out:
gst_object_unref (rtp_mux);
return ret;
}
static void
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clear_caps (GstCaps * caps, gboolean only_clock_rate)
{
gint i, j;
/* Lets only match on the clock-rate */
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstStructure *s = gst_caps_get_structure (caps, i);
for (j = 0; j < gst_structure_n_fields (s); j++) {
const gchar *name = gst_structure_nth_field_name (s, j);
if (strcmp (name, "clock-rate") && (only_clock_rate ||
(strcmp (name, "ssrc")))) {
gst_structure_remove_field (s, name);
j--;
}
}
}
}
static gboolean
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same_clock_rate_fold (gpointer item, GValue * ret, gpointer user_data)
{
GstPad *mypad = user_data;
GstPad *pad = item;
GstCaps *peercaps;
GstCaps *othercaps;
const GstCaps *accumcaps;
GstCaps *intersect;
if (pad == mypad) {
gst_object_unref (pad);
return TRUE;
}
peercaps = gst_pad_peer_get_caps (pad);
if (!peercaps) {
gst_object_unref (pad);
return TRUE;
}
othercaps = gst_caps_intersect (peercaps,
gst_pad_get_pad_template_caps (pad));
gst_caps_unref (peercaps);
accumcaps = gst_value_get_caps (ret);
clear_caps (othercaps, TRUE);
intersect = gst_caps_intersect (accumcaps, othercaps);
g_value_take_boxed (ret, intersect);
gst_caps_unref (othercaps);
gst_object_unref (pad);
return !gst_caps_is_empty (intersect);
}
static GstCaps *
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gst_rtp_mux_getcaps (GstPad * pad)
{
GstRTPMux *mux = GST_RTP_MUX (gst_pad_get_parent (pad));
GstCaps *caps = NULL;
GstIterator *iter = NULL;
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GValue v = { 0 };
GstIteratorResult res;
GstCaps *peercaps = gst_pad_peer_get_caps (mux->srcpad);
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GstCaps *othercaps = NULL;
if (peercaps) {
othercaps = gst_caps_intersect (peercaps,
gst_pad_get_pad_template_caps (pad));
gst_caps_unref (peercaps);
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} else {
othercaps = gst_caps_copy (gst_pad_get_pad_template_caps (mux->srcpad));
}
clear_caps (othercaps, FALSE);
g_value_init (&v, GST_TYPE_CAPS);
iter = gst_element_iterate_sink_pads (GST_ELEMENT (mux));
do {
gst_value_set_caps (&v, othercaps);
res = gst_iterator_fold (iter, same_clock_rate_fold, &v, pad);
} while (res == GST_ITERATOR_RESYNC);
gst_iterator_free (iter);
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caps = (GstCaps *) gst_value_get_caps (&v);
if (res == GST_ITERATOR_ERROR) {
gst_caps_unref (caps);
caps = gst_caps_new_empty ();
}
if (othercaps)
gst_caps_unref (othercaps);
gst_object_unref (mux);
return caps;
}
static void
gst_rtp_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (object);
switch (prop_id) {
case PROP_TIMESTAMP_OFFSET:
g_value_set_int (value, rtp_mux->ts_offset);
break;
case PROP_SEQNUM_OFFSET:
g_value_set_int (value, rtp_mux->seqnum_offset);
break;
case PROP_SEQNUM:
GST_OBJECT_LOCK (rtp_mux);
g_value_set_uint (value, rtp_mux->seqnum);
GST_OBJECT_UNLOCK (rtp_mux);
break;
case PROP_SSRC:
g_value_set_uint (value, rtp_mux->ssrc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (object);
switch (prop_id) {
case PROP_TIMESTAMP_OFFSET:
rtp_mux->ts_offset = g_value_get_int (value);
break;
case PROP_SEQNUM_OFFSET:
rtp_mux->seqnum_offset = g_value_get_int (value);
break;
case PROP_SSRC:
rtp_mux->ssrc = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_mux_ready_to_paused (GstRTPMux * rtp_mux)
{
GST_OBJECT_LOCK (rtp_mux);
if (rtp_mux->ssrc == -1)
rtp_mux->current_ssrc = g_random_int ();
else
rtp_mux->current_ssrc = rtp_mux->ssrc;
if (rtp_mux->seqnum_offset == -1)
rtp_mux->seqnum_base = g_random_int_range (0, G_MAXUINT16);
else
rtp_mux->seqnum_base = rtp_mux->seqnum_offset;
rtp_mux->seqnum = rtp_mux->seqnum_base;
if (rtp_mux->ts_offset == -1)
rtp_mux->ts_base = g_random_int ();
else
rtp_mux->ts_base = rtp_mux->ts_offset;
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GST_DEBUG_OBJECT (rtp_mux, "set clock-base to %u", rtp_mux->ts_base);
GST_OBJECT_UNLOCK (rtp_mux);
}
static GstStateChangeReturn
gst_rtp_mux_change_state (GstElement * element, GstStateChange transition)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtp_mux_ready_to_paused (rtp_mux);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
gboolean
gst_rtp_mux_plugin_init (GstPlugin * plugin)
{
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GST_DEBUG_CATEGORY_INIT (gst_rtp_mux_debug, "rtpmux", 0, "rtp muxer");
return gst_element_register (plugin, "rtpmux", GST_RANK_NONE,
GST_TYPE_RTP_MUX);
}