gstreamer/gst/rtpmux/gstrtpmux.c
2009-02-21 17:48:56 +01:00

563 lines
16 KiB
C

/* 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
* @short_description: Muxer that takes one or several RTP streams
* and muxes them to a single rtp stream.
*
* <refsect2>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gstrtpmux.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug);
#define GST_CAT_DEFAULT gst_rtp_mux_debug
/* elementfactory information */
static const GstElementDetails gst_rtp_mux_details =
GST_ELEMENT_DETAILS ("RTP muxer",
"Codec/Muxer",
"multiplex N rtp streams into one",
"Zeeshan Ali <first.last@nokia.com>");
enum
{
ARG_0,
PROP_CLOCK_RATE,
PROP_TIMESTAMP_OFFSET,
PROP_SEQNUM_OFFSET,
PROP_SEQNUM,
PROP_SSRC
};
#define DEFAULT_TIMESTAMP_OFFSET -1
#define DEFAULT_SEQNUM_OFFSET -1
#define DEFAULT_SSRC -1
#define DEFAULT_CLOCK_RATE 0
typedef struct {
gboolean have_base;
guint clock_base;
} 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 void gst_rtp_mux_base_init (gpointer g_class);
static void gst_rtp_mux_class_init (GstRTPMuxClass * klass);
static void gst_rtp_mux_init (GstRTPMux * rtp_mux);
static void gst_rtp_mux_finalize (GObject * object);
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);
static GstFlowReturn gst_rtp_mux_chain (GstPad * pad,
GstBuffer * buffer);
static gboolean gst_rtp_mux_setcaps (GstPad *pad, GstCaps *caps);
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 gboolean gst_rtp_mux_src_event (GstPad * pad, GstEvent * event);
static GstElementClass *parent_class = NULL;
GType
gst_rtp_mux_get_type (void)
{
static GType rtp_mux_type = 0;
if (!rtp_mux_type) {
static const GTypeInfo rtp_mux_info = {
sizeof (GstRTPMuxClass),
gst_rtp_mux_base_init,
NULL,
(GClassInitFunc) gst_rtp_mux_class_init,
NULL,
NULL,
sizeof (GstRTPMux),
0,
(GInstanceInitFunc) gst_rtp_mux_init,
};
rtp_mux_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstRTPMux",
&rtp_mux_info, 0);
}
return rtp_mux_type;
}
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 (element_class, &gst_rtp_mux_details);
}
static void
gst_rtp_mux_class_init (GstRTPMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_rtp_mux_finalize;
gobject_class->get_property = gst_rtp_mux_get_property;
gobject_class->set_property = gst_rtp_mux_set_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_CLOCK_RATE,
g_param_spec_uint ("clock-rate", "clockrate",
"The clock-rate of the RTP streams",
0, G_MAXUINT, DEFAULT_CLOCK_RATE, G_PARAM_READWRITE));
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));
gstelement_class->request_new_pad = gst_rtp_mux_request_new_pad;
gstelement_class->release_pad = gst_rtp_mux_release_pad;
gstelement_class->change_state = gst_rtp_mux_change_state;
klass->chain_func = gst_rtp_mux_chain;
}
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) {
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
gst_rtp_mux_init (GstRTPMux * rtp_mux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtp_mux);
rtp_mux->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_event_function (rtp_mux->srcpad, gst_rtp_mux_src_event);
gst_element_add_pad (GST_ELEMENT (rtp_mux), rtp_mux->srcpad);
rtp_mux->ssrc = DEFAULT_SSRC;
rtp_mux->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
rtp_mux->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
rtp_mux->clock_rate = DEFAULT_CLOCK_RATE;
}
static void
gst_rtp_mux_finalize (GObject * object)
{
GstRTPMux *rtp_mux;
rtp_mux = GST_RTP_MUX (object);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstPad *
gst_rtp_mux_create_sinkpad (GstRTPMux * rtp_mux, GstPadTemplate * templ)
{
GstPad *newpad = NULL;
GstPadTemplate * class_templ;
class_templ = gst_element_class_get_pad_template (
GST_ELEMENT_GET_CLASS (rtp_mux), "sink_%d");
if (templ == class_templ) {
gchar *name;
/* create new pad with the name */
name = g_strdup_printf ("sink_%02d", rtp_mux->numpads);
newpad = gst_pad_new_from_template (templ, name);
g_free (name);
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);
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);
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_pad_get_element_private (pad);
if (padpriv)
g_slice_free (GstRTPMuxPadPrivate, padpriv);
gst_pad_set_element_private (pad, NULL);
gst_element_remove_pad (element, pad);
}
/* 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_pad_get_element_private (pad);
if (padpriv->have_base)
sink_ts_base = padpriv->clock_base;
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;
GstStructure * structure;
GstFlowReturn ret;
rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
buffer = gst_buffer_make_writable(buffer);
rtp_mux->seqnum++;
gst_rtp_buffer_set_seq (buffer, rtp_mux->seqnum);
GST_BUFFER_CAPS (buffer) = gst_caps_make_writable(GST_BUFFER_CAPS (buffer));
structure = gst_caps_get_structure (GST_BUFFER_CAPS (buffer), 0U);
gst_structure_set (structure, "seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base, NULL);
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));
gst_buffer_set_caps (buffer, GST_PAD_CAPS (rtp_mux->srcpad));
ret = gst_pad_push (rtp_mux->srcpad, buffer);
gst_object_unref (rtp_mux);
return ret;
}
static gboolean
gst_rtp_mux_set_clock_rate (GstRTPMux *rtp_mux, gint clock_rate)
{
gint ret = TRUE;
if (rtp_mux->clock_rate == 0) {
rtp_mux->clock_rate = clock_rate;
ret = TRUE;
}
else if (rtp_mux->clock_rate != clock_rate) {
GST_WARNING_OBJECT (rtp_mux, "Clock-rate already set to: %u",
rtp_mux->clock_rate);
ret = FALSE;
}
return ret;
}
static gboolean
gst_rtp_mux_setcaps (GstPad *pad, GstCaps *caps)
{
GstRTPMux *rtp_mux;
GstStructure *structure;
gboolean ret = TRUE;
gint clock_rate;
GstRTPMuxPadPrivate *padpriv = gst_pad_get_element_private (pad);
rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_get_int (structure, "clock-rate", &clock_rate)) {
ret = gst_rtp_mux_set_clock_rate (rtp_mux, clock_rate);
}
if (!ret)
goto out;
if (gst_structure_get_uint (structure, "clock-base", &padpriv->clock_base)) {
padpriv->have_base = TRUE;
}
caps = gst_caps_copy (caps);
gst_caps_set_simple (caps,
"clock-base", G_TYPE_UINT, rtp_mux->ts_base,
"seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base,
NULL);
GST_DEBUG_OBJECT (rtp_mux,
"setting caps %" GST_PTR_FORMAT " on src pad..", caps);
ret = gst_pad_set_caps (rtp_mux->srcpad, caps);
gst_caps_unref (caps);
out:
gst_object_unref (rtp_mux);
return ret;
}
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_CLOCK_RATE:
g_value_set_uint (value, rtp_mux->clock_rate);
break;
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:
g_value_set_uint (value, rtp_mux->seqnum);
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_CLOCK_RATE:
rtp_mux->clock_rate = g_value_get_uint (value);
break;
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)
{
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;
GST_DEBUG_OBJECT (rtp_mux, "set clock-base to %u", rtp_mux->ts_base);
}
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)
{
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);
}