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bde7c6ad11
Changed FinalizeFecHeader to recieve a list of `ProtectedStream` struct, in order to prepare for receiving multiple ssrcs to protect in the same FEC packet header. Implementation of the multistream case will follow in next CL. Change-Id: I697ef9172a07797a6f500b9ec3a9916f8f45bc04 Bug: webrtc:15002 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/307620 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40269}
67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
/*
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* Copyright (c) 2023 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_RTP_RTCP_SOURCE_FLEXFEC_HEADER_READER_WRITER_H_
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#define MODULES_RTP_RTCP_SOURCE_FLEXFEC_HEADER_READER_WRITER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "modules/rtp_rtcp/source/forward_error_correction.h"
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namespace webrtc {
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// FlexFEC header in flexible mode (R=0, F=0), minimum 12 bytes.
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// https://datatracker.ietf.org/doc/html/rfc8627#section-4.2.2.1
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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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// 0 |0|0|P|X| CC |M| PT recovery | length recovery |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// 4 | TS recovery |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// 8 | SN base_i |k| Mask [0-14] |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// 12 |k| Mask [15-45] (optional) |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// 16 | Mask [46-109] (optional) |
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// 20 | |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | ... next SN base and Mask for CSRC_i in CSRC list ... |
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//
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class FlexfecHeaderReader : public FecHeaderReader {
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public:
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FlexfecHeaderReader();
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~FlexfecHeaderReader() override;
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bool ReadFecHeader(
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ForwardErrorCorrection::ReceivedFecPacket* fec_packet) const override;
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};
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class FlexfecHeaderWriter : public FecHeaderWriter {
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public:
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FlexfecHeaderWriter();
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~FlexfecHeaderWriter() override;
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size_t MinPacketMaskSize(const uint8_t* packet_mask,
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size_t packet_mask_size) const override;
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size_t FecHeaderSize(size_t packet_mask_row_size) const override;
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void FinalizeFecHeader(
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rtc::ArrayView<const ProtectedStream> protected_streams,
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ForwardErrorCorrection::Packet& fec_packet) const override;
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};
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_FLEXFEC_HEADER_READER_WRITER_H_
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