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632 lines
17 KiB
C
632 lines
17 KiB
C
/* RTP muxer element for GStreamer
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*
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* gstrtpmux.c:
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*
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* Copyright (C) <2007> Nokia Corporation.
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* Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-rtpmux
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*
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* The rtp muxer takes multiple RTP streams having the same clock-rate and
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* muxes into a single stream with a single SSRC.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include "gstrtpmux.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug);
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#define GST_CAT_DEFAULT gst_rtp_mux_debug
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/* elementfactory information */
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static const GstElementDetails gst_rtp_mux_details =
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GST_ELEMENT_DETAILS ("RTP muxer",
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"Codec/Muxer",
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"multiplex N rtp streams into one",
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"Zeeshan Ali <first.last@nokia.com>");
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enum
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{
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ARG_0,
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PROP_TIMESTAMP_OFFSET,
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PROP_SEQNUM_OFFSET,
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PROP_SEQNUM,
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PROP_SSRC
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};
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#define DEFAULT_TIMESTAMP_OFFSET -1
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#define DEFAULT_SEQNUM_OFFSET -1
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#define DEFAULT_SSRC -1
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typedef struct
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{
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gboolean have_clock_base;
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guint clock_base;
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GstCaps *out_caps;
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} GstRTPMuxPadPrivate;
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp")
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);
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
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GST_PAD_SINK,
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GST_PAD_REQUEST,
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GST_STATIC_CAPS ("application/x-rtp")
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);
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static GstPad *gst_rtp_mux_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * name);
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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);
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static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps);
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static GstCaps *gst_rtp_mux_getcaps (GstPad * pad);
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static GstStateChangeReturn gst_rtp_mux_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_rtp_mux_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_mux_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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GST_BOILERPLATE (GstRTPMux, gst_rtp_mux, GstElement, GST_TYPE_ELEMENT);
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static void
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gst_rtp_mux_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_factory));
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gst_element_class_set_details (element_class, &gst_rtp_mux_details);
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}
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static void
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gst_rtp_mux_class_init (GstRTPMuxClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->get_property = gst_rtp_mux_get_property;
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gobject_class->set_property = gst_rtp_mux_set_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass),
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PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset",
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"Timestamp Offset",
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"Offset to add to all outgoing timestamps (-1 = random)", -1,
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G_MAXINT, DEFAULT_TIMESTAMP_OFFSET, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET,
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g_param_spec_int ("seqnum-offset", "Sequence number Offset",
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"Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT,
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DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM,
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g_param_spec_uint ("seqnum", "Sequence number",
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"The RTP sequence number of the last processed packet",
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0, G_MAXUINT, 0, G_PARAM_READABLE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
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g_param_spec_uint ("ssrc", "SSRC",
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"The SSRC of the packets (-1 == random)",
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0, G_MAXUINT, DEFAULT_SSRC, G_PARAM_READWRITE));
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gstelement_class->request_new_pad =
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GST_DEBUG_FUNCPTR (gst_rtp_mux_request_new_pad);
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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);
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klass->chain_func = gst_rtp_mux_chain;
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}
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static gboolean
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gst_rtp_mux_src_event (GstPad * pad, GstEvent * event)
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{
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GstElement *rtp_mux;
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GstIterator *iter;
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GstPad *sinkpad;
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gboolean result = FALSE;
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gboolean done = FALSE;
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rtp_mux = gst_pad_get_parent_element (pad);
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g_return_val_if_fail (rtp_mux != NULL, FALSE);
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iter = gst_element_iterate_sink_pads (rtp_mux);
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while (!done) {
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switch (gst_iterator_next (iter, (gpointer) & sinkpad)) {
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case GST_ITERATOR_OK:
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gst_event_ref (event);
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result |= gst_pad_push_event (sinkpad, event);
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gst_object_unref (sinkpad);
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break;
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case GST_ITERATOR_RESYNC:
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gst_iterator_resync (iter);
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result = FALSE;
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break;
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case GST_ITERATOR_ERROR:
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GST_WARNING_OBJECT (rtp_mux, "Error iterating sinkpads");
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case GST_ITERATOR_DONE:
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done = TRUE;
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break;
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}
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}
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gst_iterator_free (iter);
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gst_object_unref (rtp_mux);
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gst_event_unref (event);
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return result;
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}
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static void
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gst_rtp_mux_init (GstRTPMux * object, GstRTPMuxClass * g_class)
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{
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (object);
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object->srcpad =
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gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
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"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;
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object->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
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object->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
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}
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static GstPad *
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gst_rtp_mux_create_sinkpad (GstRTPMux * rtp_mux, GstPadTemplate * templ)
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{
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GstPad *newpad = NULL;
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GstPadTemplate *class_templ;
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class_templ =
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gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (rtp_mux),
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"sink_%d");
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if (templ == class_templ) {
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gchar *name;
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/* create new pad with the name */
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name = g_strdup_printf ("sink_%02d", rtp_mux->numpads);
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newpad = gst_pad_new_from_template (templ, name);
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g_free (name);
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rtp_mux->numpads++;
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} else {
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GST_WARNING_OBJECT (rtp_mux, "this is not our template!\n");
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}
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return newpad;
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}
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static void
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gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad)
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{
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GstRTPMuxClass *klass;
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GstRTPMuxPadPrivate *padpriv = g_slice_new0 (GstRTPMuxPadPrivate);
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klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
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/* setup some pad functions */
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gst_pad_set_setcaps_function (sinkpad, gst_rtp_mux_setcaps);
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gst_pad_set_getcaps_function (sinkpad, gst_rtp_mux_getcaps);
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if (klass->chain_func)
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gst_pad_set_chain_function (sinkpad, klass->chain_func);
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if (klass->sink_event_func)
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gst_pad_set_event_function (sinkpad, klass->sink_event_func);
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/* This could break with gstreamer 0.10.9 */
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gst_pad_set_active (sinkpad, TRUE);
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gst_pad_set_element_private (sinkpad, padpriv);
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/* dd the pad to the element */
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gst_element_add_pad (GST_ELEMENT (rtp_mux), sinkpad);
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}
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static GstPad *
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gst_rtp_mux_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * req_name)
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{
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GstRTPMux *rtp_mux;
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GstPad *newpad;
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g_return_val_if_fail (templ != NULL, NULL);
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g_return_val_if_fail (GST_IS_RTP_MUX (element), NULL);
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rtp_mux = GST_RTP_MUX (element);
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if (templ->direction != GST_PAD_SINK) {
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GST_WARNING_OBJECT (rtp_mux, "request pad that is not a SINK pad");
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return NULL;
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}
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newpad = gst_rtp_mux_create_sinkpad (rtp_mux, templ);
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if (newpad)
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gst_rtp_mux_setup_sinkpad (rtp_mux, newpad);
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else
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GST_WARNING_OBJECT (rtp_mux, "failed to create request pad");
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return newpad;
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}
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static void
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gst_rtp_mux_release_pad (GstElement * element, GstPad * pad)
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{
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GstRTPMuxPadPrivate *padpriv;
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GST_OBJECT_LOCK (element);
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padpriv = gst_pad_get_element_private (pad);
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gst_pad_set_element_private (pad, NULL);
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GST_OBJECT_UNLOCK (element);
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gst_element_remove_pad (element, pad);
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if (padpriv) {
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gst_caps_replace (&padpriv->out_caps, NULL);
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g_slice_free (GstRTPMuxPadPrivate, padpriv);
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}
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}
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/* Put our own clock-base on the buffer */
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static void
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gst_rtp_mux_readjust_rtp_timestamp (GstRTPMux * rtp_mux, GstPad * pad,
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GstBuffer * buffer)
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{
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guint32 ts;
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guint32 sink_ts_base = 0;
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GstRTPMuxPadPrivate *padpriv;
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GST_OBJECT_LOCK (rtp_mux);
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padpriv = gst_pad_get_element_private (pad);
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if (padpriv && padpriv->have_clock_base)
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sink_ts_base = padpriv->clock_base;
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GST_OBJECT_UNLOCK (rtp_mux);
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ts = gst_rtp_buffer_get_timestamp (buffer) - sink_ts_base + rtp_mux->ts_base;
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GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u",
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gst_rtp_buffer_get_timestamp (buffer), ts);
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gst_rtp_buffer_set_timestamp (buffer, ts);
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}
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static GstFlowReturn
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gst_rtp_mux_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstRTPMux *rtp_mux;
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GstFlowReturn ret;
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GstRTPMuxPadPrivate *padpriv;
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rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
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if (!gst_rtp_buffer_validate (buffer)) {
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GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer");
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gst_object_unref (rtp_mux);
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return GST_FLOW_ERROR;
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}
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buffer = gst_buffer_make_writable (buffer);
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GST_OBJECT_LOCK (rtp_mux);
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rtp_mux->seqnum++;
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gst_rtp_buffer_set_seq (buffer, rtp_mux->seqnum);
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padpriv = gst_pad_get_element_private (pad);
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if (padpriv)
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gst_buffer_set_caps (buffer, padpriv->out_caps);
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GST_OBJECT_UNLOCK (rtp_mux);
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gst_rtp_buffer_set_ssrc (buffer, rtp_mux->current_ssrc);
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gst_rtp_mux_readjust_rtp_timestamp (rtp_mux, pad, buffer);
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GST_LOG_OBJECT (rtp_mux, "Pushing packet size %d, seq=%d, ts=%u",
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GST_BUFFER_SIZE (buffer), rtp_mux->seqnum,
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gst_rtp_buffer_get_timestamp (buffer));
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if (!padpriv) {
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ret = GST_FLOW_NOT_LINKED;
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gst_buffer_unref (buffer);
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goto out;
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}
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ret = gst_pad_push (rtp_mux->srcpad, buffer);
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out:
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gst_object_unref (rtp_mux);
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return ret;
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}
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static gboolean
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gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstRTPMux *rtp_mux;
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GstStructure *structure;
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gboolean ret = FALSE;
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GstRTPMuxPadPrivate *padpriv;
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rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad));
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structure = gst_caps_get_structure (caps, 0);
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if (!structure)
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goto out;
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GST_OBJECT_LOCK (rtp_mux);
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padpriv = gst_pad_get_element_private (pad);
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if (padpriv &&
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gst_structure_get_uint (structure, "clock-base", &padpriv->clock_base)) {
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padpriv->have_clock_base = TRUE;
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}
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GST_OBJECT_UNLOCK (rtp_mux);
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caps = gst_caps_copy (caps);
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gst_caps_set_simple (caps,
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"clock-base", G_TYPE_UINT, rtp_mux->ts_base,
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"seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base, NULL);
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GST_DEBUG_OBJECT (rtp_mux,
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"setting caps %" GST_PTR_FORMAT " on src pad..", caps);
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ret = gst_pad_set_caps (rtp_mux->srcpad, caps);
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if (ret) {
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GST_OBJECT_LOCK (rtp_mux);
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padpriv = gst_pad_get_element_private (pad);
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if (padpriv)
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gst_caps_replace (&padpriv->out_caps, caps);
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GST_OBJECT_UNLOCK (rtp_mux);
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}
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gst_caps_unref (caps);
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out:
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gst_object_unref (rtp_mux);
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return ret;
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}
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static void
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clear_caps (GstCaps * caps, gboolean only_clock_rate)
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{
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gint i, j;
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/* Lets only match on the clock-rate */
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for (i = 0; i < gst_caps_get_size (caps); i++) {
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GstStructure *s = gst_caps_get_structure (caps, i);
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for (j = 0; j < gst_structure_n_fields (s); j++) {
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const gchar *name = gst_structure_nth_field_name (s, j);
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if (strcmp (name, "clock-rate") && (only_clock_rate ||
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(strcmp (name, "ssrc")))) {
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gst_structure_remove_field (s, name);
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j--;
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}
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}
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}
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}
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static gboolean
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same_clock_rate_fold (gpointer item, GValue * ret, gpointer user_data)
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{
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GstPad *mypad = user_data;
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GstPad *pad = item;
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GstCaps *peercaps;
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GstCaps *othercaps;
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const GstCaps *accumcaps;
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GstCaps *intersect;
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if (pad == mypad) {
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gst_object_unref (pad);
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return TRUE;
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}
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peercaps = gst_pad_peer_get_caps (pad);
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if (!peercaps) {
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gst_object_unref (pad);
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return TRUE;
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}
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othercaps = gst_caps_intersect (peercaps,
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gst_pad_get_pad_template_caps (pad));
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gst_caps_unref (peercaps);
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accumcaps = gst_value_get_caps (ret);
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clear_caps (othercaps, TRUE);
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intersect = gst_caps_intersect (accumcaps, othercaps);
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g_value_take_boxed (ret, intersect);
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gst_caps_unref (othercaps);
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gst_object_unref (pad);
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return !gst_caps_is_empty (intersect);
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|
}
|
|
|
|
static GstCaps *
|
|
gst_rtp_mux_getcaps (GstPad * pad)
|
|
{
|
|
GstRTPMux *mux = GST_RTP_MUX (gst_pad_get_parent (pad));
|
|
GstCaps *caps = NULL;
|
|
GstIterator *iter = NULL;
|
|
GValue v = { 0 };
|
|
GstIteratorResult res;
|
|
GstCaps *peercaps = gst_pad_peer_get_caps (mux->srcpad);
|
|
GstCaps *othercaps = NULL;
|
|
|
|
if (peercaps) {
|
|
othercaps = gst_caps_intersect (peercaps,
|
|
gst_pad_get_pad_template_caps (pad));
|
|
gst_caps_unref (peercaps);
|
|
} 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);
|
|
|
|
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;
|
|
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)
|
|
{
|
|
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);
|
|
}
|