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a5d952f4be
Reland with fixes for fuzzer found crashes. This refactoring helps to reduce unnecessary memcpy calls on the receive side. This CL replaces |uint8 data[IP_PACKET_SIZE]| with |rtc::CopyOnWriteBuffer data| in Packet class, removes |length| field there, and does necessary changes. Original Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145332 Bug: webrtc:10750 Change-Id: I6775a701bcb2ae25ec1666e1db90041cd49013b7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/151131 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29116}
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
/*
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* Copyright (c) 2012 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_ULPFEC_GENERATOR_H_
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#define MODULES_RTP_RTCP_SOURCE_ULPFEC_GENERATOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <list>
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#include <memory>
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#include <vector>
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#include "modules/include/module_fec_types.h"
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#include "modules/rtp_rtcp/source/forward_error_correction.h"
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namespace webrtc {
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class FlexfecSender;
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class RedPacket {
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public:
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explicit RedPacket(size_t length);
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~RedPacket();
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void CreateHeader(const uint8_t* rtp_header,
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size_t header_length,
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int red_payload_type,
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int payload_type);
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void SetSeqNum(int seq_num);
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void AssignPayload(const uint8_t* payload, size_t length);
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void ClearMarkerBit();
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uint8_t* data() const;
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size_t length() const;
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private:
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std::unique_ptr<uint8_t[]> data_;
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size_t length_;
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size_t header_length_;
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};
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class UlpfecGenerator {
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friend class FlexfecSender;
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public:
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UlpfecGenerator();
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~UlpfecGenerator();
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void SetFecParameters(const FecProtectionParams& params);
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// Adds a media packet to the internal buffer. When enough media packets
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// have been added, the FEC packets are generated and stored internally.
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// These FEC packets are then obtained by calling GetFecPacketsAsRed().
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int AddRtpPacketAndGenerateFec(const rtc::CopyOnWriteBuffer& data_buffer,
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size_t rtp_header_length);
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// Returns true if there are generated FEC packets available.
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bool FecAvailable() const;
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size_t NumAvailableFecPackets() const;
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// Returns the overhead, per packet, for FEC (and possibly RED).
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size_t MaxPacketOverhead() const;
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// Returns generated FEC packets with RED headers added.
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std::vector<std::unique_ptr<RedPacket>> GetUlpfecPacketsAsRed(
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int red_payload_type,
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int ulpfec_payload_type,
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uint16_t first_seq_num);
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private:
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explicit UlpfecGenerator(std::unique_ptr<ForwardErrorCorrection> fec);
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// Overhead is defined as relative to the number of media packets, and not
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// relative to total number of packets. This definition is inherited from the
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// protection factor produced by video_coding module and how the FEC
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// generation is implemented.
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int Overhead() const;
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// Returns true if the excess overhead (actual - target) for the FEC is below
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// the amount |kMaxExcessOverhead|. This effects the lower protection level
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// cases and low number of media packets/frame. The target overhead is given
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// by |params_.fec_rate|, and is only achievable in the limit of large number
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// of media packets.
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bool ExcessOverheadBelowMax() const;
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// Returns true if the number of added media packets is at least
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// |min_num_media_packets_|. This condition tries to capture the effect
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// that, for the same amount of protection/overhead, longer codes
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// (e.g. (2k,2m) vs (k,m)) are generally more effective at recovering losses.
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bool MinimumMediaPacketsReached() const;
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void ResetState();
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std::unique_ptr<ForwardErrorCorrection> fec_;
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ForwardErrorCorrection::PacketList media_packets_;
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size_t last_media_packet_rtp_header_length_;
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std::list<ForwardErrorCorrection::Packet*> generated_fec_packets_;
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int num_protected_frames_;
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int min_num_media_packets_;
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FecProtectionParams params_;
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FecProtectionParams new_params_;
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};
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_ULPFEC_GENERATOR_H_
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