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89 lines
3.5 KiB
C++
89 lines
3.5 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 WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
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#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
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#include <list>
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#include "webrtc/modules/interface/module_common_types.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Struct for holding RTP packets.
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struct Packet {
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RTPHeader header;
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uint8_t* payload; // Datagram excluding RTP header and header extension.
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int payload_length;
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bool primary; // Primary, i.e., not redundant payload.
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int waiting_time;
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bool sync_packet;
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// Constructor.
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Packet()
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: payload(NULL),
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payload_length(0),
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primary(true),
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waiting_time(0),
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sync_packet(false) {
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}
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// Comparison operators. Establish a packet ordering based on (1) timestamp,
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// (2) sequence number, (3) regular packet vs sync-packet and (4) redundancy.
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// Timestamp and sequence numbers are compared taking wrap-around into
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// account. If both timestamp and sequence numbers are identical and one of
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// the packets is sync-packet, the regular packet is considered earlier. For
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// two regular packets with the same sequence number and timestamp a primary
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// payload is considered "smaller" than a secondary.
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bool operator==(const Packet& rhs) const {
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return (this->header.timestamp == rhs.header.timestamp &&
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this->header.sequenceNumber == rhs.header.sequenceNumber &&
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this->primary == rhs.primary &&
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this->sync_packet == rhs.sync_packet);
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}
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bool operator!=(const Packet& rhs) const { return !operator==(rhs); }
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bool operator<(const Packet& rhs) const {
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if (this->header.timestamp == rhs.header.timestamp) {
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if (this->header.sequenceNumber == rhs.header.sequenceNumber) {
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// Timestamp and sequence numbers are identical. A sync packet should
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// be recognized "larger" (i.e. "later") compared to a "network packet"
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// (regular packet from network not sync-packet). If none of the packets
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// are sync-packets, then deem the left hand side to be "smaller"
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// (i.e., "earlier") if it is primary, and right hand side is not.
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//
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// The condition on sync packets to be larger than "network packets,"
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// given same RTP sequence number and timestamp, guarantees that a
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// "network packet" to be inserted in an earlier position into
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// |packet_buffer_| compared to a sync packet of same timestamp and
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// sequence number.
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if (rhs.sync_packet)
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return true;
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if (this->sync_packet)
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return false;
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return (this->primary && !rhs.primary);
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}
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return (static_cast<uint16_t>(rhs.header.sequenceNumber
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- this->header.sequenceNumber) < 0xFFFF / 2);
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}
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return (static_cast<uint32_t>(rhs.header.timestamp
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- this->header.timestamp) < 0xFFFFFFFF / 2);
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}
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bool operator>(const Packet& rhs) const { return rhs.operator<(*this); }
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bool operator<=(const Packet& rhs) const { return !operator>(rhs); }
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bool operator>=(const Packet& rhs) const { return !operator<(rhs); }
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};
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// A list of packets.
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typedef std::list<Packet*> PacketList;
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
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