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When connected to an upstream rtpfunnel element, payload-type, ssrc and clock-rate will not be present in the received caps. rtprtxsend can already deal with only the clock rate being present there, a new property is exposed to allow users to provide a payload-type -> clock-rate map, this enables the use of the max-size-time property for bundled streams.
1006 lines
31 KiB
C
1006 lines
31 KiB
C
/* RTP Retransmission sender element for GStreamer
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*
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* gstrtprtxsend.c:
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*
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* Copyright (C) 2013 Collabora Ltd.
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* @author Julien Isorce <julien.isorce@collabora.co.uk>
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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-rtprtxsend
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* @title: rtprtxsend
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*
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* See #GstRtpRtxReceive for examples
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*
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* The purpose of the sender RTX object is to keep a history of RTP packets up
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* to a configurable limit (max-size-time or max-size-packets). It will listen
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* for upstream custom retransmission events (GstRTPRetransmissionRequest) that
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* comes from downstream (#GstRtpSession). When receiving a request it will
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* look up the requested seqnum in its list of stored packets. If the packet
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* is available, it will create a RTX packet according to RFC 4588 and send
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* this as an auxiliary stream. RTX is SSRC-multiplexed
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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 <stdlib.h>
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#include "gstrtprtxsend.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_rtx_send_debug);
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#define GST_CAT_DEFAULT gst_rtp_rtx_send_debug
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#define DEFAULT_RTX_PAYLOAD_TYPE 0
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#define DEFAULT_MAX_SIZE_TIME 0
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#define DEFAULT_MAX_SIZE_PACKETS 100
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enum
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{
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PROP_0,
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PROP_SSRC_MAP,
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PROP_PAYLOAD_TYPE_MAP,
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PROP_MAX_SIZE_TIME,
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PROP_MAX_SIZE_PACKETS,
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PROP_NUM_RTX_REQUESTS,
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PROP_NUM_RTX_PACKETS,
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PROP_CLOCK_RATE_MAP,
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};
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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",
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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 gboolean gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
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guint visible, guint bytes, guint64 time, gpointer checkdata);
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static gboolean gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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static GstFlowReturn gst_rtp_rtx_send_chain_list (GstPad * pad,
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GstObject * parent, GstBufferList * list);
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static void gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx);
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static gboolean gst_rtp_rtx_send_activate_mode (GstPad * pad,
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GstObject * parent, GstPadMode mode, gboolean active);
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static GstStateChangeReturn gst_rtp_rtx_send_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_rtp_rtx_send_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_rtx_send_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_rtp_rtx_send_finalize (GObject * object);
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G_DEFINE_TYPE (GstRtpRtxSend, gst_rtp_rtx_send, GST_TYPE_ELEMENT);
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typedef struct
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{
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guint16 seqnum;
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guint32 timestamp;
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GstBuffer *buffer;
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} BufferQueueItem;
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static void
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buffer_queue_item_free (BufferQueueItem * item)
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{
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gst_buffer_unref (item->buffer);
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g_slice_free (BufferQueueItem, item);
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}
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typedef struct
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{
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guint32 rtx_ssrc;
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guint16 seqnum_base, next_seqnum;
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gint clock_rate;
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/* history of rtp packets */
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GSequence *queue;
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} SSRCRtxData;
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static SSRCRtxData *
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ssrc_rtx_data_new (guint32 rtx_ssrc)
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{
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SSRCRtxData *data = g_slice_new0 (SSRCRtxData);
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data->rtx_ssrc = rtx_ssrc;
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data->next_seqnum = data->seqnum_base = g_random_int_range (0, G_MAXUINT16);
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data->queue = g_sequence_new ((GDestroyNotify) buffer_queue_item_free);
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return data;
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}
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static void
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ssrc_rtx_data_free (SSRCRtxData * data)
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{
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g_sequence_free (data->queue);
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g_slice_free (SSRCRtxData, data);
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}
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static void
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gst_rtp_rtx_send_class_init (GstRtpRtxSendClass * 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_rtx_send_get_property;
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gobject_class->set_property = gst_rtp_rtx_send_set_property;
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gobject_class->finalize = gst_rtp_rtx_send_finalize;
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g_object_class_install_property (gobject_class, PROP_SSRC_MAP,
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g_param_spec_boxed ("ssrc-map", "SSRC Map",
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"Map of SSRCs to their retransmission SSRCs for SSRC-multiplexed mode"
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" (default = random)", GST_TYPE_STRUCTURE,
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G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PAYLOAD_TYPE_MAP,
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g_param_spec_boxed ("payload-type-map", "Payload Type Map",
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"Map of original payload types to their retransmission payload types",
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GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
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g_param_spec_uint ("max-size-time", "Max Size Time",
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"Amount of ms to queue (0 = unlimited)", 0, G_MAXUINT,
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DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAX_SIZE_PACKETS,
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g_param_spec_uint ("max-size-packets", "Max Size Packets",
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"Amount of packets to queue (0 = unlimited)", 0, G_MAXINT16,
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DEFAULT_MAX_SIZE_PACKETS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_NUM_RTX_REQUESTS,
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g_param_spec_uint ("num-rtx-requests", "Num RTX Requests",
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"Number of retransmission events received", 0, G_MAXUINT,
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0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_NUM_RTX_PACKETS,
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g_param_spec_uint ("num-rtx-packets", "Num RTX Packets",
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" Number of retransmission packets sent", 0, G_MAXUINT,
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0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_CLOCK_RATE_MAP,
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g_param_spec_boxed ("clock-rate-map", "Clock Rate Map",
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"Map of payload types to their clock rates",
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GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
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gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP Retransmission Sender", "Codec",
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"Retransmit RTP packets when needed, according to RFC4588",
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"Julien Isorce <julien.isorce@collabora.co.uk>");
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_change_state);
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}
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static void
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gst_rtp_rtx_send_reset (GstRtpRtxSend * rtx)
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{
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GST_OBJECT_LOCK (rtx);
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gst_data_queue_flush (rtx->queue);
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g_hash_table_remove_all (rtx->ssrc_data);
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g_hash_table_remove_all (rtx->rtx_ssrcs);
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rtx->num_rtx_requests = 0;
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rtx->num_rtx_packets = 0;
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GST_OBJECT_UNLOCK (rtx);
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}
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static void
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gst_rtp_rtx_send_finalize (GObject * object)
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{
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GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
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g_hash_table_unref (rtx->ssrc_data);
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g_hash_table_unref (rtx->rtx_ssrcs);
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if (rtx->external_ssrc_map)
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gst_structure_free (rtx->external_ssrc_map);
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g_hash_table_unref (rtx->rtx_pt_map);
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if (rtx->rtx_pt_map_structure)
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gst_structure_free (rtx->rtx_pt_map_structure);
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g_hash_table_unref (rtx->clock_rate_map);
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if (rtx->clock_rate_map_structure)
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gst_structure_free (rtx->clock_rate_map_structure);
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g_object_unref (rtx->queue);
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G_OBJECT_CLASS (gst_rtp_rtx_send_parent_class)->finalize (object);
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}
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static void
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gst_rtp_rtx_send_init (GstRtpRtxSend * rtx)
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{
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GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtx);
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rtx->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_PROXY_CAPS (rtx->srcpad);
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GST_PAD_SET_PROXY_ALLOCATION (rtx->srcpad);
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gst_pad_set_event_function (rtx->srcpad,
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_src_event));
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gst_pad_set_activatemode_function (rtx->srcpad,
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_activate_mode));
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gst_element_add_pad (GST_ELEMENT (rtx), rtx->srcpad);
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rtx->sinkpad =
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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_PROXY_CAPS (rtx->sinkpad);
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GST_PAD_SET_PROXY_ALLOCATION (rtx->sinkpad);
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gst_pad_set_event_function (rtx->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_sink_event));
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gst_pad_set_chain_function (rtx->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain));
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gst_pad_set_chain_list_function (rtx->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain_list));
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gst_element_add_pad (GST_ELEMENT (rtx), rtx->sinkpad);
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rtx->queue = gst_data_queue_new (gst_rtp_rtx_send_queue_check_full, NULL,
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NULL, rtx);
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rtx->ssrc_data = g_hash_table_new_full (g_direct_hash, g_direct_equal,
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NULL, (GDestroyNotify) ssrc_rtx_data_free);
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rtx->rtx_ssrcs = g_hash_table_new (g_direct_hash, g_direct_equal);
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rtx->rtx_pt_map = g_hash_table_new (g_direct_hash, g_direct_equal);
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rtx->clock_rate_map = g_hash_table_new (g_direct_hash, g_direct_equal);
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rtx->max_size_time = DEFAULT_MAX_SIZE_TIME;
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rtx->max_size_packets = DEFAULT_MAX_SIZE_PACKETS;
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}
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static void
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gst_rtp_rtx_send_set_flushing (GstRtpRtxSend * rtx, gboolean flush)
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{
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GST_OBJECT_LOCK (rtx);
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gst_data_queue_set_flushing (rtx->queue, flush);
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gst_data_queue_flush (rtx->queue);
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GST_OBJECT_UNLOCK (rtx);
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}
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static gboolean
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gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
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guint visible, guint bytes, guint64 time, gpointer checkdata)
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{
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return FALSE;
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}
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static void
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gst_rtp_rtx_data_queue_item_free (gpointer item)
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{
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GstDataQueueItem *data = item;
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if (data->object)
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gst_mini_object_unref (data->object);
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g_slice_free (GstDataQueueItem, data);
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}
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static gboolean
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gst_rtp_rtx_send_push_out (GstRtpRtxSend * rtx, gpointer object)
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{
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GstDataQueueItem *data;
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gboolean success;
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data = g_slice_new0 (GstDataQueueItem);
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data->object = GST_MINI_OBJECT (object);
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data->size = 1;
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data->duration = 1;
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data->visible = TRUE;
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data->destroy = gst_rtp_rtx_data_queue_item_free;
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success = gst_data_queue_push (rtx->queue, data);
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if (!success)
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data->destroy (data);
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return success;
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}
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static guint32
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gst_rtp_rtx_send_choose_ssrc (GstRtpRtxSend * rtx, guint32 choice,
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gboolean consider_choice)
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{
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guint32 ssrc = consider_choice ? choice : g_random_int ();
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/* make sure to be different than any other */
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while (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc)) ||
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g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
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ssrc = g_random_int ();
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}
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return ssrc;
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}
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static SSRCRtxData *
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gst_rtp_rtx_send_get_ssrc_data (GstRtpRtxSend * rtx, guint32 ssrc)
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{
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SSRCRtxData *data;
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guint32 rtx_ssrc = 0;
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gboolean consider = FALSE;
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if (G_UNLIKELY (!g_hash_table_contains (rtx->ssrc_data,
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GUINT_TO_POINTER (ssrc)))) {
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if (rtx->external_ssrc_map) {
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gchar *ssrc_str;
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ssrc_str = g_strdup_printf ("%" G_GUINT32_FORMAT, ssrc);
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consider = gst_structure_get_uint (rtx->external_ssrc_map, ssrc_str,
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&rtx_ssrc);
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g_free (ssrc_str);
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}
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rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, rtx_ssrc, consider);
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data = ssrc_rtx_data_new (rtx_ssrc);
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g_hash_table_insert (rtx->ssrc_data, GUINT_TO_POINTER (ssrc), data);
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g_hash_table_insert (rtx->rtx_ssrcs, GUINT_TO_POINTER (rtx_ssrc),
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GUINT_TO_POINTER (ssrc));
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} else {
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data = g_hash_table_lookup (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
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}
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return data;
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}
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/* Copy fixed header and extension. Add OSN before to copy payload
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* Copy memory to avoid to manually copy each rtp buffer field.
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*/
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static GstBuffer *
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gst_rtp_rtx_buffer_new (GstRtpRtxSend * rtx, GstBuffer * buffer)
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{
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GstMemory *mem = NULL;
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GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
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GstRTPBuffer new_rtp = GST_RTP_BUFFER_INIT;
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GstBuffer *new_buffer = gst_buffer_new ();
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GstMapInfo map;
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guint payload_len = 0;
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SSRCRtxData *data;
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guint32 ssrc;
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guint16 seqnum;
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guint8 fmtp;
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gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
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/* get needed data from GstRtpRtxSend */
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ssrc = gst_rtp_buffer_get_ssrc (&rtp);
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data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
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ssrc = data->rtx_ssrc;
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seqnum = data->next_seqnum++;
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fmtp = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_pt_map,
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GUINT_TO_POINTER (gst_rtp_buffer_get_payload_type (&rtp))));
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GST_DEBUG_OBJECT (rtx, "creating rtx buffer, orig seqnum: %u, "
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"rtx seqnum: %u, rtx ssrc: %X", gst_rtp_buffer_get_seq (&rtp),
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seqnum, ssrc);
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/* gst_rtp_buffer_map does not map the payload so do it now */
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gst_rtp_buffer_get_payload (&rtp);
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/* copy fixed header */
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mem = gst_memory_copy (rtp.map[0].memory, 0, rtp.size[0]);
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gst_buffer_append_memory (new_buffer, mem);
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/* copy extension if any */
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if (rtp.size[1]) {
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mem = gst_allocator_alloc (NULL, rtp.size[1], NULL);
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gst_memory_map (mem, &map, GST_MAP_WRITE);
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memcpy (map.data, rtp.data[1], rtp.size[1]);
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gst_memory_unmap (mem, &map);
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gst_buffer_append_memory (new_buffer, mem);
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}
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/* copy payload and add OSN just before */
|
|
payload_len = 2 + rtp.size[2];
|
|
mem = gst_allocator_alloc (NULL, payload_len, NULL);
|
|
|
|
gst_memory_map (mem, &map, GST_MAP_WRITE);
|
|
GST_WRITE_UINT16_BE (map.data, gst_rtp_buffer_get_seq (&rtp));
|
|
if (rtp.size[2])
|
|
memcpy (map.data + 2, rtp.data[2], rtp.size[2]);
|
|
gst_memory_unmap (mem, &map);
|
|
gst_buffer_append_memory (new_buffer, mem);
|
|
|
|
/* everything needed is copied */
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
/* set ssrc, seqnum and fmtp */
|
|
gst_rtp_buffer_map (new_buffer, GST_MAP_WRITE, &new_rtp);
|
|
gst_rtp_buffer_set_ssrc (&new_rtp, ssrc);
|
|
gst_rtp_buffer_set_seq (&new_rtp, seqnum);
|
|
gst_rtp_buffer_set_payload_type (&new_rtp, fmtp);
|
|
/* RFC 4588: let other elements do the padding, as normal */
|
|
gst_rtp_buffer_set_padding (&new_rtp, FALSE);
|
|
gst_rtp_buffer_unmap (&new_rtp);
|
|
|
|
/* Copy over timestamps */
|
|
gst_buffer_copy_into (new_buffer, buffer, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
|
|
|
|
return new_buffer;
|
|
}
|
|
|
|
static gint
|
|
buffer_queue_items_cmp (BufferQueueItem * a, BufferQueueItem * b,
|
|
gpointer user_data)
|
|
{
|
|
/* gst_rtp_buffer_compare_seqnum returns the opposite of what we want,
|
|
* it returns negative when seqnum1 > seqnum2 and we want negative
|
|
* when b > a, i.e. a is smaller, so it comes first in the sequence */
|
|
return gst_rtp_buffer_compare_seqnum (b->seqnum, a->seqnum);
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
|
|
gboolean res;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_CUSTOM_UPSTREAM:
|
|
{
|
|
const GstStructure *s = gst_event_get_structure (event);
|
|
|
|
/* This event usually comes from the downstream gstrtpsession */
|
|
if (gst_structure_has_name (s, "GstRTPRetransmissionRequest")) {
|
|
guint seqnum = 0;
|
|
guint ssrc = 0;
|
|
GstBuffer *rtx_buf = NULL;
|
|
|
|
/* retrieve seqnum of the packet that need to be retransmitted */
|
|
if (!gst_structure_get_uint (s, "seqnum", &seqnum))
|
|
seqnum = -1;
|
|
|
|
/* retrieve ssrc of the packet that need to be retransmitted */
|
|
if (!gst_structure_get_uint (s, "ssrc", &ssrc))
|
|
ssrc = -1;
|
|
|
|
GST_DEBUG_OBJECT (rtx, "got rtx request for seqnum: %u, ssrc: %X",
|
|
seqnum, ssrc);
|
|
|
|
GST_OBJECT_LOCK (rtx);
|
|
/* check if request is for us */
|
|
if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
|
|
SSRCRtxData *data;
|
|
GSequenceIter *iter;
|
|
BufferQueueItem search_item;
|
|
|
|
/* update statistics */
|
|
++rtx->num_rtx_requests;
|
|
|
|
data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
|
|
|
|
search_item.seqnum = seqnum;
|
|
iter = g_sequence_lookup (data->queue, &search_item,
|
|
(GCompareDataFunc) buffer_queue_items_cmp, NULL);
|
|
if (iter) {
|
|
BufferQueueItem *item = g_sequence_get (iter);
|
|
GST_LOG_OBJECT (rtx, "found %u", item->seqnum);
|
|
rtx_buf = gst_rtp_rtx_buffer_new (rtx, item->buffer);
|
|
}
|
|
#ifndef GST_DISABLE_DEBUG
|
|
else {
|
|
BufferQueueItem *item = NULL;
|
|
|
|
iter = g_sequence_get_begin_iter (data->queue);
|
|
if (!g_sequence_iter_is_end (iter))
|
|
item = g_sequence_get (iter);
|
|
|
|
if (item && seqnum < item->seqnum) {
|
|
GST_DEBUG_OBJECT (rtx, "requested seqnum %u has already been "
|
|
"removed from the rtx queue; the first available is %u",
|
|
seqnum, item->seqnum);
|
|
} else {
|
|
GST_WARNING_OBJECT (rtx, "requested seqnum %u has not been "
|
|
"transmitted yet in the original stream; either the remote end "
|
|
"is not configured correctly, or the source is too slow",
|
|
seqnum);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
if (rtx_buf)
|
|
gst_rtp_rtx_send_push_out (rtx, rtx_buf);
|
|
|
|
gst_event_unref (event);
|
|
res = TRUE;
|
|
|
|
/* This event usually comes from the downstream gstrtpsession */
|
|
} else if (gst_structure_has_name (s, "GstRTPCollision")) {
|
|
guint ssrc = 0;
|
|
|
|
if (!gst_structure_get_uint (s, "ssrc", &ssrc))
|
|
ssrc = -1;
|
|
|
|
GST_DEBUG_OBJECT (rtx, "got ssrc collision, ssrc: %X", ssrc);
|
|
|
|
GST_OBJECT_LOCK (rtx);
|
|
|
|
/* choose another ssrc for our retransmitted stream */
|
|
if (g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
|
|
guint master_ssrc;
|
|
SSRCRtxData *data;
|
|
|
|
master_ssrc = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_ssrcs,
|
|
GUINT_TO_POINTER (ssrc)));
|
|
data = gst_rtp_rtx_send_get_ssrc_data (rtx, master_ssrc);
|
|
|
|
/* change rtx_ssrc and update the reverse map */
|
|
data->rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, 0, FALSE);
|
|
g_hash_table_remove (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc));
|
|
g_hash_table_insert (rtx->rtx_ssrcs,
|
|
GUINT_TO_POINTER (data->rtx_ssrc),
|
|
GUINT_TO_POINTER (master_ssrc));
|
|
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
/* no need to forward to payloader because we make sure to have
|
|
* a different ssrc
|
|
*/
|
|
gst_event_unref (event);
|
|
res = TRUE;
|
|
} else {
|
|
/* if master ssrc has collided, remove it from our data, as it
|
|
* is not going to be used any longer */
|
|
if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
|
|
SSRCRtxData *data;
|
|
data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
|
|
g_hash_table_remove (rtx->rtx_ssrcs,
|
|
GUINT_TO_POINTER (data->rtx_ssrc));
|
|
g_hash_table_remove (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
|
|
}
|
|
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
/* forward event to payloader in case collided ssrc is
|
|
* master stream */
|
|
res = gst_pad_event_default (pad, parent, event);
|
|
}
|
|
} else {
|
|
res = gst_pad_event_default (pad, parent, event);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
res = gst_pad_event_default (pad, parent, event);
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH_START:
|
|
gst_pad_push_event (rtx->srcpad, event);
|
|
gst_rtp_rtx_send_set_flushing (rtx, TRUE);
|
|
gst_pad_pause_task (rtx->srcpad);
|
|
return TRUE;
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_pad_push_event (rtx->srcpad, event);
|
|
gst_rtp_rtx_send_set_flushing (rtx, FALSE);
|
|
gst_pad_start_task (rtx->srcpad,
|
|
(GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
|
|
return TRUE;
|
|
case GST_EVENT_EOS:
|
|
GST_INFO_OBJECT (rtx, "Got EOS - enqueueing it");
|
|
gst_rtp_rtx_send_push_out (rtx, event);
|
|
return TRUE;
|
|
case GST_EVENT_CAPS:
|
|
{
|
|
GstCaps *caps;
|
|
GstStructure *s;
|
|
guint ssrc;
|
|
gint payload;
|
|
gpointer rtx_payload;
|
|
SSRCRtxData *data;
|
|
|
|
gst_event_parse_caps (event, &caps);
|
|
|
|
s = gst_caps_get_structure (caps, 0);
|
|
if (!gst_structure_get_uint (s, "ssrc", &ssrc))
|
|
ssrc = -1;
|
|
if (!gst_structure_get_int (s, "payload", &payload))
|
|
payload = -1;
|
|
|
|
if (payload == -1 || ssrc == G_MAXUINT)
|
|
break;
|
|
|
|
if (payload == -1)
|
|
GST_WARNING_OBJECT (rtx, "No payload in caps");
|
|
|
|
GST_OBJECT_LOCK (rtx);
|
|
data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
|
|
if (!g_hash_table_lookup_extended (rtx->rtx_pt_map,
|
|
GUINT_TO_POINTER (payload), NULL, &rtx_payload))
|
|
rtx_payload = GINT_TO_POINTER (-1);
|
|
|
|
if (GPOINTER_TO_INT (rtx_payload) == -1 && payload != -1)
|
|
GST_WARNING_OBJECT (rtx, "Payload %d not in rtx-pt-map", payload);
|
|
|
|
GST_DEBUG_OBJECT (rtx,
|
|
"got caps for payload: %d->%d, ssrc: %u->%u : %" GST_PTR_FORMAT,
|
|
payload, GPOINTER_TO_INT (rtx_payload), ssrc, data->rtx_ssrc, caps);
|
|
|
|
gst_structure_get_int (s, "clock-rate", &data->clock_rate);
|
|
|
|
/* The session might need to know the RTX ssrc */
|
|
caps = gst_caps_copy (caps);
|
|
gst_caps_set_simple (caps, "rtx-ssrc", G_TYPE_UINT, data->rtx_ssrc,
|
|
"rtx-seqnum-offset", G_TYPE_UINT, data->seqnum_base, NULL);
|
|
|
|
if (GPOINTER_TO_INT (rtx_payload) != -1)
|
|
gst_caps_set_simple (caps, "rtx-payload", G_TYPE_INT,
|
|
GPOINTER_TO_INT (rtx_payload), NULL);
|
|
|
|
GST_DEBUG_OBJECT (rtx, "got clock-rate from caps: %d for ssrc: %u",
|
|
data->clock_rate, ssrc);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
gst_event_unref (event);
|
|
event = gst_event_new_caps (caps);
|
|
gst_caps_unref (caps);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
return gst_pad_event_default (pad, parent, event);
|
|
}
|
|
|
|
/* like rtp_jitter_buffer_get_ts_diff() */
|
|
static guint32
|
|
gst_rtp_rtx_send_get_ts_diff (SSRCRtxData * data)
|
|
{
|
|
guint64 high_ts, low_ts;
|
|
BufferQueueItem *high_buf, *low_buf;
|
|
guint32 result;
|
|
|
|
high_buf =
|
|
g_sequence_get (g_sequence_iter_prev (g_sequence_get_end_iter
|
|
(data->queue)));
|
|
low_buf = g_sequence_get (g_sequence_get_begin_iter (data->queue));
|
|
|
|
if (!high_buf || !low_buf || high_buf == low_buf)
|
|
return 0;
|
|
|
|
high_ts = high_buf->timestamp;
|
|
low_ts = low_buf->timestamp;
|
|
|
|
/* it needs to work if ts wraps */
|
|
if (high_ts >= low_ts) {
|
|
result = (guint32) (high_ts - low_ts);
|
|
} else {
|
|
result = (guint32) (high_ts + G_MAXUINT32 + 1 - low_ts);
|
|
}
|
|
|
|
/* return value in ms instead of clock ticks */
|
|
return (guint32) gst_util_uint64_scale_int (result, 1000, data->clock_rate);
|
|
}
|
|
|
|
/* Must be called with lock */
|
|
static void
|
|
process_buffer (GstRtpRtxSend * rtx, GstBuffer * buffer)
|
|
{
|
|
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
|
BufferQueueItem *item;
|
|
SSRCRtxData *data;
|
|
guint16 seqnum;
|
|
guint8 payload_type;
|
|
guint32 ssrc, rtptime;
|
|
|
|
/* read the information we want from the buffer */
|
|
gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
|
|
seqnum = gst_rtp_buffer_get_seq (&rtp);
|
|
payload_type = gst_rtp_buffer_get_payload_type (&rtp);
|
|
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
|
|
rtptime = gst_rtp_buffer_get_timestamp (&rtp);
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
GST_TRACE_OBJECT (rtx, "Processing buffer seqnum: %u, ssrc: %X", seqnum,
|
|
ssrc);
|
|
|
|
/* do not store the buffer if it's payload type is unknown */
|
|
if (g_hash_table_contains (rtx->rtx_pt_map, GUINT_TO_POINTER (payload_type))) {
|
|
data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
|
|
|
|
if (data->clock_rate == 0 && rtx->clock_rate_map_structure) {
|
|
data->clock_rate =
|
|
GPOINTER_TO_INT (g_hash_table_lookup (rtx->clock_rate_map,
|
|
GUINT_TO_POINTER (payload_type)));
|
|
}
|
|
|
|
/* add current rtp buffer to queue history */
|
|
item = g_slice_new0 (BufferQueueItem);
|
|
item->seqnum = seqnum;
|
|
item->timestamp = rtptime;
|
|
item->buffer = gst_buffer_ref (buffer);
|
|
g_sequence_append (data->queue, item);
|
|
|
|
/* remove oldest packets from history if they are too many */
|
|
if (rtx->max_size_packets) {
|
|
while (g_sequence_get_length (data->queue) > rtx->max_size_packets)
|
|
g_sequence_remove (g_sequence_get_begin_iter (data->queue));
|
|
}
|
|
if (rtx->max_size_time) {
|
|
while (gst_rtp_rtx_send_get_ts_diff (data) > rtx->max_size_time)
|
|
g_sequence_remove (g_sequence_get_begin_iter (data->queue));
|
|
}
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
|
|
GstFlowReturn ret;
|
|
|
|
GST_OBJECT_LOCK (rtx);
|
|
process_buffer (rtx, buffer);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
ret = gst_pad_push (rtx->srcpad, buffer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
process_buffer_from_list (GstBuffer ** buffer, guint idx, gpointer user_data)
|
|
{
|
|
process_buffer (user_data, *buffer);
|
|
return TRUE;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_rtx_send_chain_list (GstPad * pad, GstObject * parent,
|
|
GstBufferList * list)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
|
|
GstFlowReturn ret;
|
|
|
|
GST_OBJECT_LOCK (rtx);
|
|
gst_buffer_list_foreach (list, process_buffer_from_list, rtx);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
ret = gst_pad_push_list (rtx->srcpad, list);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx)
|
|
{
|
|
GstDataQueueItem *data;
|
|
|
|
if (gst_data_queue_pop (rtx->queue, &data)) {
|
|
GST_LOG_OBJECT (rtx, "pushing rtx buffer %p", data->object);
|
|
|
|
if (G_LIKELY (GST_IS_BUFFER (data->object))) {
|
|
GST_OBJECT_LOCK (rtx);
|
|
/* Update statistics just before pushing. */
|
|
rtx->num_rtx_packets++;
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
|
|
gst_pad_push (rtx->srcpad, GST_BUFFER (data->object));
|
|
} else if (GST_IS_EVENT (data->object)) {
|
|
gst_pad_push_event (rtx->srcpad, GST_EVENT (data->object));
|
|
|
|
/* after EOS, we should not send any more buffers,
|
|
* even if there are more requests coming in */
|
|
if (GST_EVENT_TYPE (data->object) == GST_EVENT_EOS) {
|
|
gst_rtp_rtx_send_set_flushing (rtx, TRUE);
|
|
}
|
|
} else {
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
data->object = NULL; /* we no longer own that object */
|
|
data->destroy (data);
|
|
} else {
|
|
GST_LOG_OBJECT (rtx, "flushing");
|
|
gst_pad_pause_task (rtx->srcpad);
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_rtx_send_activate_mode (GstPad * pad, GstObject * parent,
|
|
GstPadMode mode, gboolean active)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
|
|
gboolean ret = FALSE;
|
|
|
|
switch (mode) {
|
|
case GST_PAD_MODE_PUSH:
|
|
if (active) {
|
|
gst_rtp_rtx_send_set_flushing (rtx, FALSE);
|
|
ret = gst_pad_start_task (rtx->srcpad,
|
|
(GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
|
|
} else {
|
|
gst_rtp_rtx_send_set_flushing (rtx, TRUE);
|
|
ret = gst_pad_stop_task (rtx->srcpad);
|
|
}
|
|
GST_INFO_OBJECT (rtx, "activate_mode: active %d, ret %d", active, ret);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_rtx_send_get_property (GObject * object,
|
|
guint prop_id, GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_PAYLOAD_TYPE_MAP:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_boxed (value, rtx->rtx_pt_map_structure);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_MAX_SIZE_TIME:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_uint (value, rtx->max_size_time);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_MAX_SIZE_PACKETS:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_uint (value, rtx->max_size_packets);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_NUM_RTX_REQUESTS:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_uint (value, rtx->num_rtx_requests);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_NUM_RTX_PACKETS:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_uint (value, rtx->num_rtx_packets);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_CLOCK_RATE_MAP:
|
|
GST_OBJECT_LOCK (rtx);
|
|
g_value_set_boxed (value, rtx->clock_rate_map_structure);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
structure_to_hash_table (GQuark field_id, const GValue * value, gpointer hash)
|
|
{
|
|
const gchar *field_str;
|
|
guint field_uint;
|
|
guint value_uint;
|
|
|
|
field_str = g_quark_to_string (field_id);
|
|
field_uint = atoi (field_str);
|
|
value_uint = g_value_get_uint (value);
|
|
g_hash_table_insert ((GHashTable *) hash, GUINT_TO_POINTER (field_uint),
|
|
GUINT_TO_POINTER (value_uint));
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_rtx_send_set_property (GObject * object,
|
|
guint prop_id, const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_SSRC_MAP:
|
|
GST_OBJECT_LOCK (rtx);
|
|
if (rtx->external_ssrc_map)
|
|
gst_structure_free (rtx->external_ssrc_map);
|
|
rtx->external_ssrc_map = g_value_dup_boxed (value);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_PAYLOAD_TYPE_MAP:
|
|
GST_OBJECT_LOCK (rtx);
|
|
if (rtx->rtx_pt_map_structure)
|
|
gst_structure_free (rtx->rtx_pt_map_structure);
|
|
rtx->rtx_pt_map_structure = g_value_dup_boxed (value);
|
|
g_hash_table_remove_all (rtx->rtx_pt_map);
|
|
gst_structure_foreach (rtx->rtx_pt_map_structure, structure_to_hash_table,
|
|
rtx->rtx_pt_map);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_MAX_SIZE_TIME:
|
|
GST_OBJECT_LOCK (rtx);
|
|
rtx->max_size_time = g_value_get_uint (value);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_MAX_SIZE_PACKETS:
|
|
GST_OBJECT_LOCK (rtx);
|
|
rtx->max_size_packets = g_value_get_uint (value);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
case PROP_CLOCK_RATE_MAP:
|
|
GST_OBJECT_LOCK (rtx);
|
|
if (rtx->clock_rate_map_structure)
|
|
gst_structure_free (rtx->clock_rate_map_structure);
|
|
rtx->clock_rate_map_structure = g_value_dup_boxed (value);
|
|
g_hash_table_remove_all (rtx->clock_rate_map);
|
|
gst_structure_foreach (rtx->clock_rate_map_structure,
|
|
structure_to_hash_table, rtx->clock_rate_map);
|
|
GST_OBJECT_UNLOCK (rtx);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_rtp_rtx_send_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstStateChangeReturn ret;
|
|
GstRtpRtxSend *rtx;
|
|
|
|
rtx = GST_RTP_RTX_SEND (element);
|
|
|
|
switch (transition) {
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret =
|
|
GST_ELEMENT_CLASS (gst_rtp_rtx_send_parent_class)->change_state (element,
|
|
transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
gst_rtp_rtx_send_reset (rtx);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
gboolean
|
|
gst_rtp_rtx_send_plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (gst_rtp_rtx_send_debug, "rtprtxsend", 0,
|
|
"rtp retransmission sender");
|
|
|
|
return gst_element_register (plugin, "rtprtxsend", GST_RANK_NONE,
|
|
GST_TYPE_RTP_RTX_SEND);
|
|
}
|