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162 lines
6.4 KiB
C
162 lines
6.4 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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#ifndef __RTP_ULPFEC_COMMON_H__
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#define __RTP_ULPFEC_COMMON_H__
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#include <gst/gst.h>
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#include <gst/rtp/rtp.h>
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G_BEGIN_DECLS
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#define GST_WARNING_RTP_PACKET(obj, name, pkt) rtp_ulpfec_log_rtppacket (GST_CAT_DEFAULT, GST_LEVEL_WARNING, obj, name, pkt)
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#define GST_LOG_RTP_PACKET(obj, name, pkt) rtp_ulpfec_log_rtppacket (GST_CAT_DEFAULT, GST_LEVEL_LOG, obj, name, pkt)
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#define GST_DEBUG_RTP_PACKET(obj, name, pkt) rtp_ulpfec_log_rtppacket (GST_CAT_DEFAULT, GST_LEVEL_DEBUG, obj, name, pkt)
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#define GST_INFO_RTP_PACKET(obj, name, pkt) rtp_ulpfec_log_rtppacket (GST_CAT_DEFAULT, GST_LEVEL_INFO, obj, name, pkt)
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#define GST_WARNING_FEC_PACKET(obj, pkt) rtp_ulpfec_log_fec_packet (GST_CAT_DEFAULT, GST_LEVEL_WARNING, obj, pkt)
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#define GST_DEBUG_FEC_PACKET(obj, pkt) rtp_ulpfec_log_fec_packet (GST_CAT_DEFAULT, GST_LEVEL_DEBUG, obj, pkt)
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#define GST_INFO_FEC_PACKET(obj, pkt) rtp_ulpfec_log_fec_packet (GST_CAT_DEFAULT, GST_LEVEL_INFO, obj, pkt)
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#define RTP_ULPFEC_PROTECTED_PACKETS_MAX(L) ((L) ? 48 : 16)
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#define RTP_ULPFEC_SEQ_BASE_OFFSET_MAX(L) (RTP_ULPFEC_PROTECTED_PACKETS_MAX(L) - 1)
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/**
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* RtpUlpFecMapInfo: Helper wrapper around GstRTPBuffer
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*
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* @rtp: mapped RTP buffer
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**/
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typedef struct {
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// FIXME: it used to contain more fields now we are left with only GstRTPBuffer.
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// it will be nice to use it directly
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GstRTPBuffer rtp;
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} RtpUlpFecMapInfo;
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/* FIXME: parse/write these properly instead of relying in packed structs */
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#ifdef _MSC_VER
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#pragma pack(push, 1)
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#define ATTRIBUTE_PACKED
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#else
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#define ATTRIBUTE_PACKED __attribute__ ((packed))
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#endif
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/* RFC 5109 */
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|E|L|P|X| CC |M| PT recovery | SN base |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| TS recovery |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| length recovery |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 3: FEC Header Format
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*/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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typedef struct {
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guint8 CC:4;
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guint8 X:1;
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guint8 P:1;
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guint8 L:1;
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guint8 E:1;
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guint8 pt:7;
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guint8 M:1;
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guint16 seq;
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guint32 timestamp;
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guint16 len;
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} ATTRIBUTE_PACKED RtpUlpFecHeader;
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#else
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typedef struct {
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guint8 E:1;
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guint8 L:1;
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guint8 P:1;
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guint8 X:1;
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guint8 CC:4;
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guint8 M:1;
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guint8 pt:7;
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guint16 seq;
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guint32 timestamp;
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guint16 len;
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} ATTRIBUTE_PACKED RtpUlpFecHeader;
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#endif
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Protection Length | mask |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| mask cont. (present only when L = 1) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 4: ULP Level Header Format
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*/
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typedef struct
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{
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guint16 protection_len;
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guint16 mask;
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guint32 mask_continued;
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} ATTRIBUTE_PACKED RtpUlpFecLevelHeader;
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#ifdef _MSC_VER
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#pragma pack(pop)
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#else
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#undef ATTRIBUTE_PACKED
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#endif
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gboolean rtp_ulpfec_map_info_map (GstBuffer *buffer, RtpUlpFecMapInfo *info);
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void rtp_ulpfec_map_info_unmap (RtpUlpFecMapInfo *info);
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void rtp_buffer_to_ulpfec_bitstring (GstRTPBuffer *rtp, GArray *dst_arr,
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gboolean fec_buffer, gboolean fec_mask_long);
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GstBuffer * rtp_ulpfec_bitstring_to_media_rtp_buffer (GArray *arr,
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gboolean fec_mask_long, guint32 ssrc, guint16 seq);
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GstBuffer * rtp_ulpfec_bitstring_to_fec_rtp_buffer (GArray *arr, guint16 seq_base, gboolean fec_mask_long,
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guint64 fec_mask, gboolean marker, guint8 pt, guint16 seq,
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guint32 timestamp, guint32 ssrc);
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#ifndef GST_DISABLE_GST_DEBUG
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void rtp_ulpfec_log_rtppacket (GstDebugCategory * cat, GstDebugLevel level,
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gpointer object, const gchar *name,
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GstRTPBuffer *rtp);
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void rtp_ulpfec_log_fec_packet (GstDebugCategory * cat, GstDebugLevel level,
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gpointer object, GstRTPBuffer *fecrtp);
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#else
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#define rtp_ulpfec_log_rtppacket(cat,level,obj,name,rtp) /* NOOP */
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#define rtp_ulpfec_log_fec_packet(cat,level,obj,fecrtp) /* NOOP */
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#endif
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RtpUlpFecHeader * rtp_ulpfec_buffer_get_fechdr (GstRTPBuffer *rtp);
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guint rtp_ulpfec_get_headers_len (gboolean fec_mask_long);
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guint16 rtp_ulpfec_hdr_get_protection_len (RtpUlpFecHeader const *fec_hdr);
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guint64 rtp_ulpfec_packet_mask_from_seqnum (guint16 seq, guint16 fec_seq_base, gboolean fec_mask_long);
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guint64 rtp_ulpfec_buffer_get_mask (GstRTPBuffer *rtp);
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guint16 rtp_ulpfec_buffer_get_seq_base (GstRTPBuffer *rtp);
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gboolean rtp_ulpfec_mask_is_long (guint64 mask);
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gboolean rtp_ulpfec_buffer_is_valid (GstRTPBuffer * rtp);
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G_END_DECLS
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#endif
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