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We expose a set of new elements: * ULPFEC encoder / decoder * A storage element, which should be placed before jitterbuffers, and is used to store packets in order to attempt reconstruction after the jitterbuffer has sent PacketLost events * RED encoder / decoder (RFC 2198), these are necessary to use FEC in webrtc, as browsers will propose and expect ulpfec packets to be wrapped in red packets With contributions from: Mathieu Duponchelle <mathieu@centricular.com> Sebastian Dröge <sebastian@centricular.com> https://bugzilla.gnome.org/show_bug.cgi?id=792696
90 lines
2.5 KiB
C
90 lines
2.5 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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#include "rtpredcommon.h"
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gsize
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rtp_red_block_header_get_length (gboolean is_redundant)
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{
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return is_redundant ? sizeof (RedBlockHeader) : 1;
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}
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gboolean
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rtp_red_block_is_redundant (gpointer red_block)
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{
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return ((RedBlockHeader *) red_block)->F;
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}
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guint8
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rtp_red_block_get_payload_type (gpointer red_block)
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{
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return ((RedBlockHeader *) red_block)->pt;
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}
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guint16
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rtp_red_block_get_payload_length (gpointer red_block)
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{
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RedBlockHeader *hdr = (RedBlockHeader *) red_block;
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return (hdr->length_hi << 8) | hdr->length_lo;
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}
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guint16
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rtp_red_block_get_timestamp_offset (gpointer red_block)
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{
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RedBlockHeader *hdr = (RedBlockHeader *) red_block;
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return (hdr->timestamp_offset_hi << 6) | hdr->timestamp_offset_lo;
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}
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void
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rtp_red_block_set_payload_type (gpointer red_block, guint8 pt)
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{
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((RedBlockHeader *) red_block)->pt = pt;
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}
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void
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rtp_red_block_set_is_redundant (gpointer red_block, gboolean is_redundant)
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{
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((RedBlockHeader *) red_block)->F = is_redundant;
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}
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void
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rtp_red_block_set_timestamp_offset (gpointer red_block,
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guint16 timestamp_offset)
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{
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RedBlockHeader *hdr = (RedBlockHeader *) red_block;
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g_assert (rtp_red_block_is_redundant (red_block));
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g_assert_cmpint (timestamp_offset, <=, RED_BLOCK_TIMESTAMP_OFFSET_MAX);
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hdr->timestamp_offset_lo = timestamp_offset & 0x3f;
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hdr->timestamp_offset_hi = timestamp_offset >> 6;
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}
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void
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rtp_red_block_set_payload_length (gpointer red_block, guint16 length)
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{
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RedBlockHeader *hdr = (RedBlockHeader *) red_block;
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g_assert (rtp_red_block_is_redundant (red_block));
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g_assert_cmpint (length, <=, RED_BLOCK_LENGTH_MAX);
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hdr->length_lo = length & 0xff;
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hdr->length_hi = length >> 8;
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}
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