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711 lines
22 KiB
C
711 lines
22 KiB
C
/* GStreamer plugin for forward error correction
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* Copyright (C) 2017 Pexip
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Author: Mikhail Fludkov <misha@pexip.com>
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*/
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/**
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* SECTION:element-rtpulpfecenc
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* @short_description: Generic RTP Forward Error Correction (FEC) encoder
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* @title: rtpulpfecenc
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*
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* Generic Forward Error Correction (FEC) encoder using Uneven Level
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* Protection (ULP) as described in RFC 5109.
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*
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* It differs from the RFC in one important way, it multiplexes the
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* FEC packets in the same sequence number as media packets. This is to be
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* compatible with libwebrtc as using in Google Chrome and with Microsoft
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* Lync / Skype for Business.
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*
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* Be warned that after using this element, it is no longer possible to know if
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* there is a gap in the media stream based on the sequence numbers as the FEC
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* packets become interleaved with the media packets.
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*
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* This element will insert protection packets in any RTP stream, which
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* can then be used on the receiving side to recover lost packets.
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*
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* This element rewrites packets' seqnums, which means that when combined
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* with retransmission elements such as #GstRtpRtxSend, it *must* be
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* placed upstream of those, otherwise retransmission requests will request
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* incorrect seqnums.
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*
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* A payload type for the protection packets *must* be specified, different
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* from the payload type of the protected packets, with the GstRtpUlpFecEnc:pt
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* property.
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*
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* The marker bit of RTP packets is used to determine sets of packets to
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* protect as a unit, in order to modulate the level of protection, this
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* behaviour can be disabled with GstRtpUlpFecEnc:multipacket, but should
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* be left enabled for video streams.
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*
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* The level of protection can be configured with two properties,
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* #GstRtpUlpFecEnc:percentage and #GstRtpUlpFecEnc:percentage-important,
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* the element will determine which percentage to use for a given set of
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* packets based on the presence of the #GST_BUFFER_FLAG_NON_DROPPABLE
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* flag, upstream payloaders are expected to set this flag on "important"
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* packets such as those making up a keyframe.
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*
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* The percentage is expressed not in terms of bytes, but in terms of
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* packets, this for implementation convenience. The drawback with this
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* approach is that when using a percentage different from 100 %, and a
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* low bitrate, entire frames may be contained in a single packet, leading
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* to some packets not being protected, thus lowering the overall recovery
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* rate on the receiving side.
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*
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* When using #GstRtpBin, this element should be inserted through the
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* #GstRtpBin::request-fec-encoder signal.
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*
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* ## Example pipeline
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*
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* |[
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* gst-launch-1.0 videotestsrc ! x264enc ! video/x-h264, profile=baseline ! rtph264pay pt=96 ! rtpulpfecenc percentage=100 pt=122 ! udpsink port=8888
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* ]| This example will receive a stream with FEC and try to reconstruct the packets.
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*
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* Example programs are available at
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* <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/blob/master/examples/src/bin/rtpfecserver.rs>
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* and
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* <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/blob/master/examples/src/bin/rtpfecclient.rs>
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*
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* See also: #GstRtpUlpFecDec, #GstRtpBin
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* Since: 1.14
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*/
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#include <gst/rtp/gstrtp-enumtypes.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include "rtpulpfeccommon.h"
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#include "gstrtpulpfecenc.h"
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static GstStaticPadTemplate sinktemplate = 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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static GstStaticPadTemplate srctemplate = 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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#define UNDEF_PT 255
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#define DEFAULT_PT UNDEF_PT
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#define DEFAULT_PCT 0
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#define DEFAULT_PCT_IMPORTANT 0
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#define DEFAULT_MULTIPACKET TRUE
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#define PACKETS_BUF_MAX_LENGTH (RTP_ULPFEC_PROTECTED_PACKETS_MAX(TRUE))
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GST_DEBUG_CATEGORY (gst_rtp_ulpfec_enc_debug);
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#define GST_CAT_DEFAULT (gst_rtp_ulpfec_enc_debug)
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G_DEFINE_TYPE (GstRtpUlpFecEnc, gst_rtp_ulpfec_enc, GST_TYPE_ELEMENT);
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enum
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{
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PROP_0,
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PROP_PT,
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PROP_MULTIPACKET,
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PROP_PROTECTED,
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PROP_PERCENTAGE,
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PROP_PERCENTAGE_IMPORTANT,
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};
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#define RTP_FEC_MAP_INFO_NTH(ctx, data) (&g_array_index (\
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((GstRtpUlpFecEncStreamCtx *)ctx)->info_arr, \
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RtpUlpFecMapInfo, \
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GPOINTER_TO_UINT(data)))
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static void
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gst_rtp_ulpfec_enc_stream_ctx_start (GstRtpUlpFecEncStreamCtx * ctx,
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GQueue * packets, guint fec_packets)
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{
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GList *it = packets->tail;
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guint i;
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g_array_set_size (ctx->info_arr, packets->length);
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for (i = 0; i < packets->length; ++i) {
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GstBuffer *buffer = it->data;
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RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (ctx, i);
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if (!rtp_ulpfec_map_info_map (gst_buffer_ref (buffer), info))
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g_assert_not_reached ();
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GST_LOG_RTP_PACKET (ctx->parent, "rtp header (incoming)", &info->rtp);
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it = g_list_previous (it);
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}
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ctx->fec_packets = fec_packets;
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ctx->fec_packet_idx = 0;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_stop (GstRtpUlpFecEncStreamCtx * ctx)
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{
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g_array_set_size (ctx->info_arr, 0);
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g_array_set_size (ctx->scratch_buf, 0);
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ctx->fec_packets = 0;
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ctx->fec_packet_idx = 0;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_get_protection_parameters
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(GstRtpUlpFecEncStreamCtx * ctx, guint16 * dst_seq_base, guint64 * dst_mask,
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guint * dst_start, guint * dst_end)
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{
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guint media_packets = ctx->info_arr->len;
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guint start = ctx->fec_packet_idx * media_packets / ctx->fec_packets;
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guint end =
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((ctx->fec_packet_idx + 1) * media_packets + ctx->fec_packets -
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1) / ctx->fec_packets - 1;
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guint len = end - start + 1;
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guint64 mask = 0;
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guint16 seq_base = 0;
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guint i;
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len = MIN (len, RTP_ULPFEC_PROTECTED_PACKETS_MAX (TRUE));
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end = start + len - 1;
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for (i = start; i <= end; ++i) {
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RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (ctx, i);
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guint16 seq = gst_rtp_buffer_get_seq (&info->rtp);
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if (mask) {
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gint diff = gst_rtp_buffer_compare_seqnum (seq_base, seq);
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if (diff < 0) {
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seq_base = seq;
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mask = mask >> (-diff);
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}
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mask |= rtp_ulpfec_packet_mask_from_seqnum (seq, seq_base, TRUE);
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} else {
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seq_base = seq;
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mask = rtp_ulpfec_packet_mask_from_seqnum (seq, seq_base, TRUE);
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}
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}
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*dst_start = start;
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*dst_end = end;
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*dst_mask = mask;
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*dst_seq_base = seq_base;
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}
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static GstBuffer *
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gst_rtp_ulpfec_enc_stream_ctx_protect (GstRtpUlpFecEncStreamCtx * ctx,
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guint8 pt, guint16 seq, guint32 timestamp, guint32 ssrc)
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{
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guint end = 0;
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guint start = 0;
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guint64 fec_mask = 0;
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guint16 seq_base = 0;
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GstBuffer *ret;
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guint64 tmp_mask;
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gboolean fec_mask_long;
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guint i;
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if (ctx->fec_packet_idx >= ctx->fec_packets)
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return NULL;
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g_array_set_size (ctx->scratch_buf, 0);
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gst_rtp_ulpfec_enc_stream_ctx_get_protection_parameters (ctx, &seq_base,
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&fec_mask, &start, &end);
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tmp_mask = fec_mask;
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fec_mask_long = rtp_ulpfec_mask_is_long (fec_mask);
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for (i = start; i <= end; ++i) {
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RtpUlpFecMapInfo *info = RTP_FEC_MAP_INFO_NTH (ctx, i);
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guint64 packet_mask =
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rtp_ulpfec_packet_mask_from_seqnum (gst_rtp_buffer_get_seq (&info->rtp),
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seq_base,
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TRUE);
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if (tmp_mask & packet_mask) {
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tmp_mask ^= packet_mask;
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rtp_buffer_to_ulpfec_bitstring (&info->rtp, ctx->scratch_buf, FALSE,
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fec_mask_long);
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}
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}
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g_assert (tmp_mask == 0);
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ret =
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rtp_ulpfec_bitstring_to_fec_rtp_buffer (ctx->scratch_buf, seq_base,
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fec_mask_long, fec_mask, FALSE, pt, seq, timestamp, ssrc);
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++ctx->fec_packet_idx;
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return ret;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_report_budget (GstRtpUlpFecEncStreamCtx * ctx)
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{
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GST_TRACE_OBJECT (ctx->parent, "budget = %f budget_important = %f",
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ctx->budget, ctx->budget_important);
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_increment_budget (GstRtpUlpFecEncStreamCtx * ctx,
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GstBuffer * buffer)
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{
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if (ctx->percentage == 0 && ctx->percentage_important == 0) {
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if (ctx->budget > 0) {
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ctx->budget = 0;
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ctx->budget_important = 0;
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}
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if (ctx->budget < 0)
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ctx->budget += ctx->budget_inc;
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return;
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}
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ctx->budget += ctx->budget_inc;
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_NON_DROPPABLE)) {
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ctx->budget_important += ctx->budget_inc_important;
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}
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gst_rtp_ulpfec_enc_stream_ctx_report_budget (ctx);
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_decrement_budget (GstRtpUlpFecEncStreamCtx * ctx,
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guint fec_packets_num)
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{
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if (ctx->budget_important >= 1.)
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ctx->budget_important -= fec_packets_num;
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ctx->budget -= fec_packets_num;
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gst_rtp_ulpfec_enc_stream_ctx_report_budget (ctx);
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}
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static guint
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gst_rtp_ulpfec_enc_stream_ctx_get_fec_packets_num (GstRtpUlpFecEncStreamCtx *
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ctx)
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{
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g_assert_cmpfloat (ctx->budget_important, >=, 0.);
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if (ctx->budget_important >= 1.)
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return ctx->budget_important;
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return ctx->budget > 0. ? (guint) ctx->budget : 0;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_free_packets_buf (GstRtpUlpFecEncStreamCtx * ctx)
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{
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while (ctx->packets_buf.length)
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gst_buffer_unref (g_queue_pop_tail (&ctx->packets_buf));
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_prepend_to_fec_buffer (GstRtpUlpFecEncStreamCtx *
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ctx, GstRTPBuffer * rtp, guint buf_max_size)
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{
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GList *new_head;
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if (ctx->packets_buf.length == buf_max_size) {
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new_head = g_queue_pop_tail_link (&ctx->packets_buf);
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} else {
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new_head = g_list_alloc ();
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}
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gst_buffer_replace ((GstBuffer **) & new_head->data, rtp->buffer);
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g_queue_push_head_link (&ctx->packets_buf, new_head);
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g_assert_cmpint (ctx->packets_buf.length, <=, buf_max_size);
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}
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static GstFlowReturn
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gst_rtp_ulpfec_enc_stream_ctx_push_fec_packets (GstRtpUlpFecEncStreamCtx * ctx,
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guint8 pt, guint16 seq, guint32 timestamp, guint32 ssrc)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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guint fec_packets_num =
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gst_rtp_ulpfec_enc_stream_ctx_get_fec_packets_num (ctx);
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if (fec_packets_num) {
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guint fec_packets_pushed = 0;
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GstBuffer *latest_packet = ctx->packets_buf.head->data;
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GstBuffer *fec = NULL;
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gst_rtp_ulpfec_enc_stream_ctx_start (ctx, &ctx->packets_buf,
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fec_packets_num);
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while (NULL != (fec =
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gst_rtp_ulpfec_enc_stream_ctx_protect (ctx, pt,
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seq + fec_packets_pushed, timestamp, ssrc))) {
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gst_buffer_copy_into (fec, latest_packet, GST_BUFFER_COPY_TIMESTAMPS, 0,
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-1);
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ret = gst_pad_push (ctx->srcpad, fec);
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if (GST_FLOW_OK == ret)
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++fec_packets_pushed;
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else
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break;
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}
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gst_rtp_ulpfec_enc_stream_ctx_stop (ctx);
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g_assert_cmpint (fec_packets_pushed, <=, fec_packets_num);
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ctx->num_packets_protected += ctx->packets_buf.length;
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ctx->num_packets_fec += fec_packets_pushed;
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ctx->seqnum_offset += fec_packets_pushed;
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ctx->seqnum += fec_packets_pushed;
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}
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gst_rtp_ulpfec_enc_stream_ctx_decrement_budget (ctx, fec_packets_num);
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return ret;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_cache_packet (GstRtpUlpFecEncStreamCtx * ctx,
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GstRTPBuffer * rtp, gboolean * dst_empty_packet_buffer,
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gboolean * dst_push_fec)
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{
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if (ctx->multipacket) {
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gst_rtp_ulpfec_enc_stream_ctx_prepend_to_fec_buffer (ctx, rtp,
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PACKETS_BUF_MAX_LENGTH);
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gst_rtp_ulpfec_enc_stream_ctx_increment_budget (ctx, rtp->buffer);
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*dst_empty_packet_buffer = gst_rtp_buffer_get_marker (rtp);
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*dst_push_fec = *dst_empty_packet_buffer;
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} else {
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gboolean push_fec;
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gst_rtp_ulpfec_enc_stream_ctx_prepend_to_fec_buffer (ctx, rtp, 1);
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push_fec = ctx->fec_nth == 0 ? FALSE :
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0 == (ctx->num_packets_received % ctx->fec_nth);
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ctx->budget = push_fec ? 1 : 0;
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ctx->budget_important = 0;
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*dst_push_fec = push_fec;
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*dst_empty_packet_buffer = FALSE;
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}
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_configure (GstRtpUlpFecEncStreamCtx * ctx,
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guint pt, guint percentage, guint percentage_important,
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gboolean multipacket)
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{
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ctx->pt = pt;
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ctx->percentage = percentage;
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ctx->percentage_important = percentage_important;
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ctx->multipacket = multipacket;
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ctx->fec_nth = percentage ? 100 / percentage : 0;
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if (percentage) {
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ctx->budget_inc = percentage / 100.;
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ctx->budget_inc_important = percentage > percentage_important ?
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ctx->budget_inc : percentage_important / 100.;
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}
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/*
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else {
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ctx->budget_inc = 0.0;
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}
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*/
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ctx->budget_inc_important = percentage > percentage_important ?
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ctx->budget_inc : percentage_important / 100.;
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}
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static GstRtpUlpFecEncStreamCtx *
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gst_rtp_ulpfec_enc_stream_ctx_new (guint ssrc,
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GstElement * parent, GstPad * srcpad,
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guint pt, guint percentage, guint percentage_important,
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gboolean multipacket)
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{
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GstRtpUlpFecEncStreamCtx *ctx = g_new0 (GstRtpUlpFecEncStreamCtx, 1);
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ctx->ssrc = ssrc;
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ctx->parent = parent;
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ctx->srcpad = srcpad;
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ctx->seqnum = g_random_int_range (0, G_MAXUINT16 / 2);
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ctx->info_arr = g_array_new (FALSE, TRUE, sizeof (RtpUlpFecMapInfo));
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g_array_set_clear_func (ctx->info_arr,
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(GDestroyNotify) rtp_ulpfec_map_info_unmap);
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ctx->parent = parent;
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ctx->scratch_buf = g_array_new (FALSE, TRUE, sizeof (guint8));
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gst_rtp_ulpfec_enc_stream_ctx_configure (ctx, pt,
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percentage, percentage_important, multipacket);
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return ctx;
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}
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static void
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gst_rtp_ulpfec_enc_stream_ctx_free (GstRtpUlpFecEncStreamCtx * ctx)
|
|
{
|
|
if (ctx->num_packets_received) {
|
|
GST_INFO_OBJECT (ctx->parent, "Actual FEC overhead is %4.2f%% (%u/%u)\n",
|
|
ctx->num_packets_fec * (double) 100. / ctx->num_packets_received,
|
|
ctx->num_packets_fec, ctx->num_packets_received);
|
|
}
|
|
gst_rtp_ulpfec_enc_stream_ctx_free_packets_buf (ctx);
|
|
|
|
g_assert (0 == ctx->info_arr->len);
|
|
g_array_free (ctx->info_arr, TRUE);
|
|
g_array_free (ctx->scratch_buf, TRUE);
|
|
g_slice_free1 (sizeof (GstRtpUlpFecEncStreamCtx), ctx);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_ulpfec_enc_stream_ctx_process (GstRtpUlpFecEncStreamCtx * ctx,
|
|
GstBuffer * buffer)
|
|
{
|
|
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
|
GstFlowReturn ret;
|
|
gboolean push_fec = FALSE;
|
|
gboolean empty_packet_buffer = FALSE;
|
|
|
|
ctx->num_packets_received++;
|
|
|
|
if (ctx->seqnum_offset > 0) {
|
|
buffer = gst_buffer_make_writable (buffer);
|
|
if (!gst_rtp_buffer_map (buffer,
|
|
GST_MAP_READWRITE | GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtp))
|
|
g_assert_not_reached ();
|
|
gst_rtp_buffer_set_seq (&rtp,
|
|
gst_rtp_buffer_get_seq (&rtp) + ctx->seqnum_offset);
|
|
} else {
|
|
if (!gst_rtp_buffer_map (buffer,
|
|
GST_MAP_READ | GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtp))
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
gst_rtp_ulpfec_enc_stream_ctx_cache_packet (ctx, &rtp, &empty_packet_buffer,
|
|
&push_fec);
|
|
|
|
if (push_fec) {
|
|
guint32 fec_timestamp = gst_rtp_buffer_get_timestamp (&rtp);
|
|
guint32 fec_ssrc = gst_rtp_buffer_get_ssrc (&rtp);
|
|
guint16 fec_seq = gst_rtp_buffer_get_seq (&rtp) + 1;
|
|
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
ret = gst_pad_push (ctx->srcpad, buffer);
|
|
if (GST_FLOW_OK == ret)
|
|
ret =
|
|
gst_rtp_ulpfec_enc_stream_ctx_push_fec_packets (ctx, ctx->pt, fec_seq,
|
|
fec_timestamp, fec_ssrc);
|
|
} else {
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
ret = gst_pad_push (ctx->srcpad, buffer);
|
|
}
|
|
|
|
if (empty_packet_buffer)
|
|
gst_rtp_ulpfec_enc_stream_ctx_free_packets_buf (ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static GstRtpUlpFecEncStreamCtx *
|
|
gst_rtp_ulpfec_enc_aquire_ctx (GstRtpUlpFecEnc * fec, guint ssrc)
|
|
{
|
|
GstRtpUlpFecEncStreamCtx *ctx;
|
|
|
|
GST_OBJECT_LOCK (fec);
|
|
ctx = g_hash_table_lookup (fec->ssrc_to_ctx, GUINT_TO_POINTER (ssrc));
|
|
if (ctx == NULL) {
|
|
ctx =
|
|
gst_rtp_ulpfec_enc_stream_ctx_new (ssrc, GST_ELEMENT_CAST (fec),
|
|
fec->srcpad, fec->pt, fec->percentage,
|
|
fec->percentage_important, fec->multipacket);
|
|
g_hash_table_insert (fec->ssrc_to_ctx, GUINT_TO_POINTER (ssrc), ctx);
|
|
}
|
|
GST_OBJECT_UNLOCK (fec);
|
|
|
|
return ctx;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_rtp_ulpfec_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
|
|
{
|
|
GstRtpUlpFecEnc *fec = GST_RTP_ULPFEC_ENC (parent);
|
|
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
|
|
GstFlowReturn ret;
|
|
guint ssrc = 0;
|
|
GstRtpUlpFecEncStreamCtx *ctx;
|
|
|
|
if (fec->pt == UNDEF_PT)
|
|
return gst_pad_push (fec->srcpad, buffer);
|
|
|
|
/* FIXME: avoid this additional mapping of the buffer to get the
|
|
ssrc! */
|
|
if (!gst_rtp_buffer_map (buffer,
|
|
GST_MAP_READ | GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtp)) {
|
|
g_assert_not_reached ();
|
|
}
|
|
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
|
|
gst_rtp_buffer_unmap (&rtp);
|
|
|
|
ctx = gst_rtp_ulpfec_enc_aquire_ctx (fec, ssrc);
|
|
|
|
ret = gst_rtp_ulpfec_enc_stream_ctx_process (ctx, buffer);
|
|
|
|
/* FIXME: does not work for multiple ssrcs */
|
|
fec->num_packets_protected = ctx->num_packets_protected;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_configure_ctx (gpointer key, gpointer value,
|
|
gpointer user_data)
|
|
{
|
|
GstRtpUlpFecEnc *fec = user_data;
|
|
GstRtpUlpFecEncStreamCtx *ctx = value;
|
|
|
|
gst_rtp_ulpfec_enc_stream_ctx_configure (ctx, fec->pt,
|
|
fec->percentage, fec->percentage_important, fec->multipacket);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpUlpFecEnc *fec = GST_RTP_ULPFEC_ENC (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_PT:
|
|
fec->pt = g_value_get_uint (value);
|
|
break;
|
|
case PROP_MULTIPACKET:
|
|
fec->multipacket = g_value_get_boolean (value);
|
|
break;
|
|
case PROP_PERCENTAGE:
|
|
fec->percentage = g_value_get_uint (value);
|
|
break;
|
|
case PROP_PERCENTAGE_IMPORTANT:
|
|
fec->percentage_important = g_value_get_uint (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (fec);
|
|
g_hash_table_foreach (fec->ssrc_to_ctx, gst_rtp_ulpfec_enc_configure_ctx,
|
|
fec);
|
|
GST_OBJECT_UNLOCK (fec);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpUlpFecEnc *fec = GST_RTP_ULPFEC_ENC (object);
|
|
switch (prop_id) {
|
|
case PROP_PT:
|
|
g_value_set_uint (value, fec->pt);
|
|
break;
|
|
case PROP_PROTECTED:
|
|
g_value_set_uint (value, fec->num_packets_protected);
|
|
break;
|
|
case PROP_PERCENTAGE:
|
|
g_value_set_uint (value, fec->percentage);
|
|
break;
|
|
case PROP_PERCENTAGE_IMPORTANT:
|
|
g_value_set_uint (value, fec->percentage_important);
|
|
break;
|
|
case PROP_MULTIPACKET:
|
|
g_value_set_boolean (value, fec->multipacket);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_dispose (GObject * obj)
|
|
{
|
|
GstRtpUlpFecEnc *fec = GST_RTP_ULPFEC_ENC (obj);
|
|
|
|
g_hash_table_destroy (fec->ssrc_to_ctx);
|
|
|
|
G_OBJECT_CLASS (gst_rtp_ulpfec_enc_parent_class)->dispose (obj);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_init (GstRtpUlpFecEnc * fec)
|
|
{
|
|
fec->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
|
|
gst_element_add_pad (GST_ELEMENT (fec), fec->srcpad);
|
|
|
|
fec->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
|
|
GST_PAD_SET_PROXY_CAPS (fec->sinkpad);
|
|
GST_PAD_SET_PROXY_ALLOCATION (fec->sinkpad);
|
|
gst_pad_set_chain_function (fec->sinkpad,
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_enc_chain));
|
|
gst_element_add_pad (GST_ELEMENT (fec), fec->sinkpad);
|
|
|
|
fec->ssrc_to_ctx = g_hash_table_new_full (NULL, NULL, NULL,
|
|
(GDestroyNotify) gst_rtp_ulpfec_enc_stream_ctx_free);
|
|
}
|
|
|
|
static void
|
|
gst_rtp_ulpfec_enc_class_init (GstRtpUlpFecEncClass * klass)
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
|
|
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
|
|
|
GST_DEBUG_CATEGORY_INIT (gst_rtp_ulpfec_enc_debug, "rtpulpfecenc", 0,
|
|
"FEC encoder element");
|
|
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&srctemplate));
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&sinktemplate));
|
|
|
|
gst_element_class_set_static_metadata (element_class,
|
|
"RTP FEC Encoder",
|
|
"Codec/Payloader/Network/RTP",
|
|
"Encodes RTP FEC (RFC5109)", "Mikhail Fludkov <misha@pexip.com>");
|
|
|
|
gobject_class->set_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_enc_set_property);
|
|
gobject_class->get_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_enc_get_property);
|
|
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_rtp_ulpfec_enc_dispose);
|
|
|
|
g_object_class_install_property (gobject_class, PROP_PT,
|
|
g_param_spec_uint ("pt", "payload type",
|
|
"The payload type of FEC packets", 0, 255, DEFAULT_PT,
|
|
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (gobject_class, PROP_MULTIPACKET,
|
|
g_param_spec_boolean ("multipacket", "Multipacket",
|
|
"Apply FEC on multiple packets", DEFAULT_MULTIPACKET,
|
|
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (gobject_class, PROP_PERCENTAGE,
|
|
g_param_spec_uint ("percentage", "Percentage",
|
|
"FEC overhead percentage for the whole stream", 0, 100, DEFAULT_PCT,
|
|
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (gobject_class, PROP_PERCENTAGE_IMPORTANT,
|
|
g_param_spec_uint ("percentage-important", "Percentage important",
|
|
"FEC overhead percentage for important packets",
|
|
0, 100, DEFAULT_PCT_IMPORTANT,
|
|
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (gobject_class, PROP_PROTECTED,
|
|
g_param_spec_uint ("protected", "Protected",
|
|
"Count of protected packets", 0, G_MAXUINT32, 0,
|
|
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
|
|
}
|