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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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949 lines
25 KiB
C
949 lines
25 KiB
C
/* GStreamer
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* Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
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*
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* RTP SSRC demuxer
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-rtpssrcdemux
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*
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* rtpssrcdemux acts as a demuxer for RTP packets based on the SSRC of the
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* packets. Its main purpose is to allow an application to easily receive and
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* decode an RTP stream with multiple SSRCs.
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*
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* For each SSRC that is detected, a new pad will be created and the
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* #GstRtpSsrcDemux::new-ssrc-pad signal will be emitted.
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*
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* <refsect2>
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* <title>Example pipelines</title>
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* |[
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* gst-launch-1.0 udpsrc caps="application/x-rtp" ! rtpssrcdemux ! fakesink
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* ]| Takes an RTP stream and send the RTP packets with the first detected SSRC
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* to fakesink, discarding the other SSRCs.
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* </refsect2>
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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 <string.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include <gst/rtp/gstrtcpbuffer.h>
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#include "gstrtpssrcdemux.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_ssrc_demux_debug);
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#define GST_CAT_DEFAULT gst_rtp_ssrc_demux_debug
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/* generic templates */
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static GstStaticPadTemplate rtp_ssrc_demux_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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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 rtp_ssrc_demux_rtcp_sink_template =
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GST_STATIC_PAD_TEMPLATE ("rtcp_sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtcp")
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);
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static GstStaticPadTemplate rtp_ssrc_demux_src_template =
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GST_STATIC_PAD_TEMPLATE ("src_%u",
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GST_PAD_SRC,
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GST_PAD_SOMETIMES,
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GST_STATIC_CAPS ("application/x-rtp")
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);
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static GstStaticPadTemplate rtp_ssrc_demux_rtcp_src_template =
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GST_STATIC_PAD_TEMPLATE ("rtcp_src_%u",
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GST_PAD_SRC,
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GST_PAD_SOMETIMES,
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GST_STATIC_CAPS ("application/x-rtcp")
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);
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#define GST_PAD_LOCK(obj) (g_rec_mutex_lock (&(obj)->padlock))
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#define GST_PAD_UNLOCK(obj) (g_rec_mutex_unlock (&(obj)->padlock))
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typedef enum
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{
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RTP_PAD,
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RTCP_PAD
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} PadType;
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/* signals */
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enum
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{
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SIGNAL_NEW_SSRC_PAD,
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SIGNAL_REMOVED_SSRC_PAD,
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SIGNAL_CLEAR_SSRC,
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LAST_SIGNAL
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};
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#define gst_rtp_ssrc_demux_parent_class parent_class
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G_DEFINE_TYPE (GstRtpSsrcDemux, gst_rtp_ssrc_demux, GST_TYPE_ELEMENT);
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/* GObject vmethods */
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static void gst_rtp_ssrc_demux_dispose (GObject * object);
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static void gst_rtp_ssrc_demux_finalize (GObject * object);
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/* GstElement vmethods */
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static GstStateChangeReturn gst_rtp_ssrc_demux_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux,
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guint32 ssrc);
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/* sinkpad stuff */
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static GstFlowReturn gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static gboolean gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad,
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GstObject * parent, GstBuffer * buf);
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static GstIterator *gst_rtp_ssrc_demux_iterate_internal_links_sink (GstPad *
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pad, GstObject * parent);
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/* srcpad stuff */
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static gboolean gst_rtp_ssrc_demux_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstIterator *gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad * pad,
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GstObject * parent);
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static gboolean gst_rtp_ssrc_demux_src_query (GstPad * pad, GstObject * parent,
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GstQuery * query);
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static guint gst_rtp_ssrc_demux_signals[LAST_SIGNAL] = { 0 };
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/*
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* Item for storing GstPad <-> SSRC pairs.
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*/
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struct _GstRtpSsrcDemuxPad
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{
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guint32 ssrc;
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GstPad *rtp_pad;
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GstCaps *caps;
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GstPad *rtcp_pad;
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gboolean pushed_initial_rtp_events;
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gboolean pushed_initial_rtcp_events;
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};
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/* find a src pad for a given SSRC, returns NULL if the SSRC was not found
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*/
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static GstRtpSsrcDemuxPad *
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find_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
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{
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GSList *walk;
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for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
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GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
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if (pad->ssrc == ssrc)
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return pad;
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}
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return NULL;
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}
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static GstEvent *
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add_ssrc_and_ref (GstEvent * event, guint32 ssrc)
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{
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/* Set the ssrc on the output caps */
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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GstCaps *newcaps;
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GstStructure *s;
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gst_event_parse_caps (event, &caps);
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newcaps = gst_caps_copy (caps);
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s = gst_caps_get_structure (newcaps, 0);
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gst_structure_set (s, "ssrc", G_TYPE_UINT, ssrc, NULL);
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event = gst_event_new_caps (newcaps);
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gst_caps_unref (newcaps);
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break;
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}
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default:
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gst_event_ref (event);
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break;
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}
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return event;
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}
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struct ForwardStickyEventData
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{
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GstPad *pad;
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guint32 ssrc;
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};
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static gboolean
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forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
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{
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struct ForwardStickyEventData *data = user_data;
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GstEvent *newevent;
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newevent = add_ssrc_and_ref (*event, data->ssrc);
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gst_pad_push_event (data->pad, newevent);
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return TRUE;
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}
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static void
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forward_initial_events (GstRtpSsrcDemux * demux, guint32 ssrc, GstPad * pad,
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PadType padtype)
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{
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struct ForwardStickyEventData fdata;
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GstPad *sinkpad = NULL;
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if (padtype == RTP_PAD)
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sinkpad = demux->rtp_sink;
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else if (padtype == RTCP_PAD)
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sinkpad = demux->rtcp_sink;
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else
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g_assert_not_reached ();
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fdata.ssrc = ssrc;
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fdata.pad = pad;
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gst_pad_sticky_events_foreach (sinkpad, forward_sticky_events, &fdata);
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}
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static GstPad *
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find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc,
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PadType padtype)
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{
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GstPad *rtp_pad, *rtcp_pad;
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GstElementClass *klass;
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GstPadTemplate *templ;
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gchar *padname;
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GstRtpSsrcDemuxPad *demuxpad;
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GstPad *retpad;
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gulong rtp_block, rtcp_block;
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GST_PAD_LOCK (demux);
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demuxpad = find_demux_pad_for_ssrc (demux, ssrc);
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if (demuxpad != NULL) {
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gboolean forward = FALSE;
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switch (padtype) {
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case RTP_PAD:
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retpad = gst_object_ref (demuxpad->rtp_pad);
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if (!demuxpad->pushed_initial_rtp_events) {
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forward = TRUE;
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demuxpad->pushed_initial_rtp_events = TRUE;
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}
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break;
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case RTCP_PAD:
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retpad = gst_object_ref (demuxpad->rtcp_pad);
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if (!demuxpad->pushed_initial_rtcp_events) {
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forward = TRUE;
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demuxpad->pushed_initial_rtcp_events = TRUE;
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}
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break;
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default:
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retpad = NULL;
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g_assert_not_reached ();
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}
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GST_PAD_UNLOCK (demux);
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if (forward)
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forward_initial_events (demux, ssrc, retpad, padtype);
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return retpad;
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}
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GST_DEBUG_OBJECT (demux, "creating new pad for SSRC %08x", ssrc);
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klass = GST_ELEMENT_GET_CLASS (demux);
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templ = gst_element_class_get_pad_template (klass, "src_%u");
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padname = g_strdup_printf ("src_%u", ssrc);
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rtp_pad = gst_pad_new_from_template (templ, padname);
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g_free (padname);
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templ = gst_element_class_get_pad_template (klass, "rtcp_src_%u");
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padname = g_strdup_printf ("rtcp_src_%u", ssrc);
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rtcp_pad = gst_pad_new_from_template (templ, padname);
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g_free (padname);
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/* wrap in structure and add to list */
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demuxpad = g_new0 (GstRtpSsrcDemuxPad, 1);
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demuxpad->ssrc = ssrc;
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demuxpad->rtp_pad = rtp_pad;
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demuxpad->rtcp_pad = rtcp_pad;
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gst_pad_set_element_private (rtp_pad, demuxpad);
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gst_pad_set_element_private (rtcp_pad, demuxpad);
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demux->srcpads = g_slist_prepend (demux->srcpads, demuxpad);
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gst_pad_set_query_function (rtp_pad, gst_rtp_ssrc_demux_src_query);
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gst_pad_set_iterate_internal_links_function (rtp_pad,
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gst_rtp_ssrc_demux_iterate_internal_links_src);
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gst_pad_set_event_function (rtp_pad, gst_rtp_ssrc_demux_src_event);
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gst_pad_use_fixed_caps (rtp_pad);
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gst_pad_set_active (rtp_pad, TRUE);
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gst_pad_set_event_function (rtcp_pad, gst_rtp_ssrc_demux_src_event);
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gst_pad_set_iterate_internal_links_function (rtcp_pad,
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gst_rtp_ssrc_demux_iterate_internal_links_src);
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gst_pad_use_fixed_caps (rtcp_pad);
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gst_pad_set_active (rtcp_pad, TRUE);
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if (padtype == RTP_PAD) {
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demuxpad->pushed_initial_rtp_events = TRUE;
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forward_initial_events (demux, ssrc, rtp_pad, padtype);
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} else if (padtype == RTCP_PAD) {
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demuxpad->pushed_initial_rtcp_events = TRUE;
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forward_initial_events (demux, ssrc, rtcp_pad, padtype);
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} else {
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g_assert_not_reached ();
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}
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gst_element_add_pad (GST_ELEMENT_CAST (demux), rtp_pad);
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gst_element_add_pad (GST_ELEMENT_CAST (demux), rtcp_pad);
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switch (padtype) {
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case RTP_PAD:
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retpad = gst_object_ref (demuxpad->rtp_pad);
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break;
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case RTCP_PAD:
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retpad = gst_object_ref (demuxpad->rtcp_pad);
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break;
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default:
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retpad = NULL;
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g_assert_not_reached ();
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}
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gst_object_ref (rtp_pad);
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gst_object_ref (rtcp_pad);
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rtp_block = gst_pad_add_probe (rtp_pad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM,
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NULL, NULL, NULL);
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rtcp_block = gst_pad_add_probe (rtcp_pad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM,
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NULL, NULL, NULL);
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GST_PAD_UNLOCK (demux);
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g_signal_emit (G_OBJECT (demux),
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gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
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gst_pad_remove_probe (rtp_pad, rtp_block);
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gst_pad_remove_probe (rtcp_pad, rtcp_block);
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gst_object_unref (rtp_pad);
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gst_object_unref (rtcp_pad);
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return retpad;
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}
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static void
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gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
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{
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GObjectClass *gobject_klass;
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GstElementClass *gstelement_klass;
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GstRtpSsrcDemuxClass *gstrtpssrcdemux_klass;
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gobject_klass = (GObjectClass *) klass;
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gstelement_klass = (GstElementClass *) klass;
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gstrtpssrcdemux_klass = (GstRtpSsrcDemuxClass *) klass;
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gobject_klass->dispose = gst_rtp_ssrc_demux_dispose;
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gobject_klass->finalize = gst_rtp_ssrc_demux_finalize;
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/**
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* GstRtpSsrcDemux::new-ssrc-pad:
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* @demux: the object which received the signal
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* @ssrc: the SSRC of the pad
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* @pad: the new pad.
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*
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* Emited when a new SSRC pad has been created.
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*/
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gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD] =
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g_signal_new ("new-ssrc-pad",
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G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, new_ssrc_pad),
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NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
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GST_TYPE_PAD);
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/**
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* GstRtpSsrcDemux::removed-ssrc-pad:
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* @demux: the object which received the signal
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* @ssrc: the SSRC of the pad
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* @pad: the removed pad.
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*
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* Emited when a SSRC pad has been removed.
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*/
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gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD] =
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g_signal_new ("removed-ssrc-pad",
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G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, removed_ssrc_pad),
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NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
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GST_TYPE_PAD);
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/**
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* GstRtpSsrcDemux::clear-ssrc:
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* @demux: the object which received the signal
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* @ssrc: the SSRC of the pad
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*
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* Action signal to remove the pad for SSRC.
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*/
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gst_rtp_ssrc_demux_signals[SIGNAL_CLEAR_SSRC] =
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g_signal_new ("clear-ssrc",
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G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
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G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, clear_ssrc),
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NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 1, G_TYPE_UINT);
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gstelement_klass->change_state =
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GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_change_state);
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gstrtpssrcdemux_klass->clear_ssrc =
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GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_clear_ssrc);
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gst_element_class_add_pad_template (gstelement_klass,
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gst_static_pad_template_get (&rtp_ssrc_demux_sink_template));
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gst_element_class_add_pad_template (gstelement_klass,
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gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_sink_template));
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gst_element_class_add_pad_template (gstelement_klass,
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gst_static_pad_template_get (&rtp_ssrc_demux_src_template));
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gst_element_class_add_pad_template (gstelement_klass,
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gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_src_template));
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gst_element_class_set_static_metadata (gstelement_klass, "RTP SSRC Demux",
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"Demux/Network/RTP",
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"Splits RTP streams based on the SSRC",
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"Wim Taymans <wim.taymans@gmail.com>");
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GST_DEBUG_CATEGORY_INIT (gst_rtp_ssrc_demux_debug,
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"rtpssrcdemux", 0, "RTP SSRC demuxer");
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}
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static void
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gst_rtp_ssrc_demux_init (GstRtpSsrcDemux * demux)
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{
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (demux);
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demux->rtp_sink =
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gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
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"sink"), "sink");
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gst_pad_set_chain_function (demux->rtp_sink, gst_rtp_ssrc_demux_chain);
|
|
gst_pad_set_event_function (demux->rtp_sink, gst_rtp_ssrc_demux_sink_event);
|
|
gst_pad_set_iterate_internal_links_function (demux->rtp_sink,
|
|
gst_rtp_ssrc_demux_iterate_internal_links_sink);
|
|
gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtp_sink);
|
|
|
|
demux->rtcp_sink =
|
|
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
|
|
"rtcp_sink"), "rtcp_sink");
|
|
gst_pad_set_chain_function (demux->rtcp_sink, gst_rtp_ssrc_demux_rtcp_chain);
|
|
gst_pad_set_event_function (demux->rtcp_sink, gst_rtp_ssrc_demux_sink_event);
|
|
gst_pad_set_iterate_internal_links_function (demux->rtcp_sink,
|
|
gst_rtp_ssrc_demux_iterate_internal_links_sink);
|
|
gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtcp_sink);
|
|
|
|
g_rec_mutex_init (&demux->padlock);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ssrc_demux_reset (GstRtpSsrcDemux * demux)
|
|
{
|
|
GSList *walk;
|
|
|
|
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
|
|
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
|
|
|
|
gst_pad_set_active (dpad->rtp_pad, FALSE);
|
|
gst_pad_set_active (dpad->rtcp_pad, FALSE);
|
|
|
|
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
|
|
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
|
|
g_free (dpad);
|
|
}
|
|
g_slist_free (demux->srcpads);
|
|
demux->srcpads = NULL;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ssrc_demux_dispose (GObject * object)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (object);
|
|
|
|
gst_rtp_ssrc_demux_reset (demux);
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ssrc_demux_finalize (GObject * object)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (object);
|
|
g_rec_mutex_clear (&demux->padlock);
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
|
|
{
|
|
GstRtpSsrcDemuxPad *dpad;
|
|
|
|
GST_PAD_LOCK (demux);
|
|
dpad = find_demux_pad_for_ssrc (demux, ssrc);
|
|
if (dpad == NULL) {
|
|
GST_PAD_UNLOCK (demux);
|
|
goto unknown_pad;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
|
|
|
|
demux->srcpads = g_slist_remove (demux->srcpads, dpad);
|
|
GST_PAD_UNLOCK (demux);
|
|
|
|
gst_pad_set_active (dpad->rtp_pad, FALSE);
|
|
gst_pad_set_active (dpad->rtcp_pad, FALSE);
|
|
|
|
g_signal_emit (G_OBJECT (demux),
|
|
gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD], 0, ssrc,
|
|
dpad->rtp_pad);
|
|
|
|
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
|
|
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
|
|
|
|
g_free (dpad);
|
|
|
|
return;
|
|
|
|
/* ERRORS */
|
|
unknown_pad:
|
|
{
|
|
GST_WARNING_OBJECT (demux, "unknown SSRC %08x", ssrc);
|
|
return;
|
|
}
|
|
}
|
|
|
|
struct ForwardEventData
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
GstEvent *event;
|
|
gboolean res;
|
|
GstPad *pad;
|
|
};
|
|
|
|
static gboolean
|
|
forward_event (GstPad * pad, gpointer user_data)
|
|
{
|
|
struct ForwardEventData *fdata = user_data;
|
|
GSList *walk = NULL;
|
|
GstEvent *newevent = NULL;
|
|
|
|
GST_PAD_LOCK (fdata->demux);
|
|
for (walk = fdata->demux->srcpads; walk; walk = walk->next) {
|
|
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
|
|
|
|
/* Only forward the event if the initial events have been through first,
|
|
* the initial events should be forwarded before any other event
|
|
* or buffer is pushed */
|
|
if ((pad == dpad->rtp_pad && dpad->pushed_initial_rtp_events) ||
|
|
(pad == dpad->rtcp_pad && dpad->pushed_initial_rtcp_events)) {
|
|
newevent = add_ssrc_and_ref (fdata->event, dpad->ssrc);
|
|
break;
|
|
}
|
|
}
|
|
GST_PAD_UNLOCK (fdata->demux);
|
|
|
|
if (newevent)
|
|
fdata->res &= gst_pad_push_event (pad, newevent);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstObject * parent,
|
|
GstEvent * event)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
struct ForwardEventData fdata;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
fdata.demux = demux;
|
|
fdata.pad = pad;
|
|
fdata.event = event;
|
|
fdata.res = TRUE;
|
|
|
|
gst_pad_forward (pad, forward_event, &fdata);
|
|
|
|
gst_event_unref (event);
|
|
|
|
return fdata.res;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
|
|
{
|
|
GstFlowReturn ret;
|
|
GstRtpSsrcDemux *demux;
|
|
guint32 ssrc;
|
|
GstRTPBuffer rtp = { NULL };
|
|
GstPad *srcpad;
|
|
GstRtpSsrcDemuxPad *dpad;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
|
|
goto invalid_payload;
|
|
|
|
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
|
|
|
|
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTP_PAD);
|
|
if (srcpad == NULL)
|
|
goto create_failed;
|
|
|
|
/* push to srcpad */
|
|
ret = gst_pad_push (srcpad, buf);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
/* check if the ssrc still there, may have been removed */
|
|
GST_PAD_LOCK (demux);
|
|
dpad = find_demux_pad_for_ssrc (demux, ssrc);
|
|
if (dpad == NULL || dpad->rtp_pad != srcpad) {
|
|
/* SSRC was removed during the push ... ignore the error */
|
|
ret = GST_FLOW_OK;
|
|
}
|
|
GST_PAD_UNLOCK (demux);
|
|
}
|
|
|
|
gst_object_unref (srcpad);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
invalid_payload:
|
|
{
|
|
/* this is fatal and should be filtered earlier */
|
|
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
|
|
("Dropping invalid RTP payload"));
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
create_failed:
|
|
{
|
|
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
|
|
("Could not create new pad"));
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstObject * parent,
|
|
GstBuffer * buf)
|
|
{
|
|
GstFlowReturn ret;
|
|
GstRtpSsrcDemux *demux;
|
|
guint32 ssrc;
|
|
GstRTCPPacket packet;
|
|
GstRTCPBuffer rtcp = { NULL, };
|
|
GstPad *srcpad;
|
|
GstRtpSsrcDemuxPad *dpad;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
if (!gst_rtcp_buffer_validate (buf))
|
|
goto invalid_rtcp;
|
|
|
|
gst_rtcp_buffer_map (buf, GST_MAP_READ, &rtcp);
|
|
if (!gst_rtcp_buffer_get_first_packet (&rtcp, &packet)) {
|
|
gst_rtcp_buffer_unmap (&rtcp);
|
|
goto invalid_rtcp;
|
|
}
|
|
|
|
/* first packet must be SR or RR or else the validate would have failed */
|
|
switch (gst_rtcp_packet_get_type (&packet)) {
|
|
case GST_RTCP_TYPE_SR:
|
|
/* get the ssrc so that we can route it to the right source pad */
|
|
gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, NULL, NULL,
|
|
NULL);
|
|
break;
|
|
case GST_RTCP_TYPE_RR:
|
|
ssrc = gst_rtcp_packet_rr_get_ssrc (&packet);
|
|
break;
|
|
default:
|
|
goto unexpected_rtcp;
|
|
}
|
|
gst_rtcp_buffer_unmap (&rtcp);
|
|
|
|
GST_DEBUG_OBJECT (demux, "received RTCP of SSRC %08x", ssrc);
|
|
|
|
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTCP_PAD);
|
|
if (srcpad == NULL)
|
|
goto create_failed;
|
|
|
|
/* push to srcpad */
|
|
ret = gst_pad_push (srcpad, buf);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
/* check if the ssrc still there, may have been removed */
|
|
GST_PAD_LOCK (demux);
|
|
dpad = find_demux_pad_for_ssrc (demux, ssrc);
|
|
if (dpad == NULL || dpad->rtcp_pad != srcpad) {
|
|
/* SSRC was removed during the push ... ignore the error */
|
|
ret = GST_FLOW_OK;
|
|
}
|
|
GST_PAD_UNLOCK (demux);
|
|
}
|
|
|
|
gst_object_unref (srcpad);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
invalid_rtcp:
|
|
{
|
|
/* this is fatal and should be filtered earlier */
|
|
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
|
|
("Dropping invalid RTCP packet"));
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
unexpected_rtcp:
|
|
{
|
|
GST_DEBUG_OBJECT (demux, "dropping unexpected RTCP packet");
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_OK;
|
|
}
|
|
create_failed:
|
|
{
|
|
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
|
|
("Could not create new pad"));
|
|
gst_buffer_unref (buf);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
static GstRtpSsrcDemuxPad *
|
|
find_demux_pad_for_pad (GstRtpSsrcDemux * demux, GstPad * pad)
|
|
{
|
|
GSList *walk;
|
|
|
|
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
|
|
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
|
|
if (dpad->rtp_pad == pad || dpad->rtcp_pad == pad) {
|
|
return dpad;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_rtp_ssrc_demux_src_event (GstPad * pad, GstObject * parent,
|
|
GstEvent * event)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
const GstStructure *s;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CUSTOM_UPSTREAM:
|
|
case GST_EVENT_CUSTOM_BOTH:
|
|
case GST_EVENT_CUSTOM_BOTH_OOB:
|
|
s = gst_event_get_structure (event);
|
|
if (s && !gst_structure_has_field (s, "ssrc")) {
|
|
GstRtpSsrcDemuxPad *dpad = find_demux_pad_for_pad (demux, pad);
|
|
|
|
if (dpad) {
|
|
GstStructure *ws;
|
|
|
|
event = gst_event_make_writable (event);
|
|
ws = gst_event_writable_structure (event);
|
|
gst_structure_set (ws, "ssrc", G_TYPE_UINT, dpad->ssrc, NULL);
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return gst_pad_event_default (pad, parent, event);
|
|
}
|
|
|
|
static GstIterator *
|
|
gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad * pad, GstObject * parent)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
GstPad *otherpad = NULL;
|
|
GstIterator *it = NULL;
|
|
GSList *current;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
GST_PAD_LOCK (demux);
|
|
for (current = demux->srcpads; current; current = g_slist_next (current)) {
|
|
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) current->data;
|
|
|
|
if (pad == dpad->rtp_pad) {
|
|
otherpad = demux->rtp_sink;
|
|
break;
|
|
} else if (pad == dpad->rtcp_pad) {
|
|
otherpad = demux->rtcp_sink;
|
|
break;
|
|
}
|
|
}
|
|
if (otherpad) {
|
|
GValue val = { 0, };
|
|
|
|
g_value_init (&val, GST_TYPE_PAD);
|
|
g_value_set_object (&val, otherpad);
|
|
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
|
|
g_value_unset (&val);
|
|
|
|
}
|
|
GST_PAD_UNLOCK (demux);
|
|
|
|
return it;
|
|
}
|
|
|
|
/* Should return 0 for elements to be included */
|
|
static gint
|
|
src_pad_compare_func (gconstpointer a, gconstpointer b)
|
|
{
|
|
GstPad *pad = GST_PAD (g_value_get_object (a));
|
|
const gchar *prefix = g_value_get_string (b);
|
|
gint res;
|
|
|
|
/* 0 means equal means we accept the pad, accepted if there is a name
|
|
* and it starts with the prefix */
|
|
GST_OBJECT_LOCK (pad);
|
|
res = !GST_PAD_NAME (pad) || !g_str_has_prefix (GST_PAD_NAME (pad), prefix);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstIterator *
|
|
gst_rtp_ssrc_demux_iterate_internal_links_sink (GstPad * pad,
|
|
GstObject * parent)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
GstIterator *it = NULL;
|
|
GValue gval = { 0, };
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
g_value_init (&gval, G_TYPE_STRING);
|
|
if (pad == demux->rtp_sink)
|
|
g_value_set_static_string (&gval, "src_");
|
|
else if (pad == demux->rtcp_sink)
|
|
g_value_set_static_string (&gval, "rtcp_src_");
|
|
else
|
|
g_assert_not_reached ();
|
|
|
|
it = gst_element_iterate_src_pads (GST_ELEMENT_CAST (demux));
|
|
it = gst_iterator_filter (it, src_pad_compare_func, &gval);
|
|
|
|
return it;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_rtp_ssrc_demux_src_query (GstPad * pad, GstObject * parent,
|
|
GstQuery * query)
|
|
{
|
|
GstRtpSsrcDemux *demux;
|
|
gboolean res = FALSE;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (parent);
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_LATENCY:
|
|
{
|
|
|
|
if ((res = gst_pad_peer_query (demux->rtp_sink, query))) {
|
|
gboolean live;
|
|
GstClockTime min_latency, max_latency;
|
|
GstRtpSsrcDemuxPad *demuxpad;
|
|
|
|
demuxpad = gst_pad_get_element_private (pad);
|
|
|
|
gst_query_parse_latency (query, &live, &min_latency, &max_latency);
|
|
|
|
GST_DEBUG_OBJECT (demux, "peer min latency %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (min_latency));
|
|
|
|
GST_DEBUG_OBJECT (demux, "latency for SSRC %08x", demuxpad->ssrc);
|
|
|
|
gst_query_set_latency (query, live, min_latency, max_latency);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
res = gst_pad_query_default (pad, parent, query);
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_rtp_ssrc_demux_change_state (GstElement * element,
|
|
GstStateChange transition)
|
|
{
|
|
GstStateChangeReturn ret;
|
|
GstRtpSsrcDemux *demux;
|
|
|
|
demux = GST_RTP_SSRC_DEMUX (element);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
gst_rtp_ssrc_demux_reset (demux);
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|