mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-27 10:17:45 +00:00
89 lines
3.5 KiB
C++
89 lines
3.5 KiB
C++
/*
|
|
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
|
|
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
|
|
|
|
#include <list>
|
|
|
|
#include "webrtc/modules/interface/module_common_types.h"
|
|
#include "webrtc/typedefs.h"
|
|
|
|
namespace webrtc {
|
|
|
|
// Struct for holding RTP packets.
|
|
struct Packet {
|
|
RTPHeader header;
|
|
uint8_t* payload; // Datagram excluding RTP header and header extension.
|
|
int payload_length;
|
|
bool primary; // Primary, i.e., not redundant payload.
|
|
int waiting_time;
|
|
bool sync_packet;
|
|
|
|
// Constructor.
|
|
Packet()
|
|
: payload(NULL),
|
|
payload_length(0),
|
|
primary(true),
|
|
waiting_time(0),
|
|
sync_packet(false) {
|
|
}
|
|
|
|
// Comparison operators. Establish a packet ordering based on (1) timestamp,
|
|
// (2) sequence number, (3) regular packet vs sync-packet and (4) redundancy.
|
|
// Timestamp and sequence numbers are compared taking wrap-around into
|
|
// account. If both timestamp and sequence numbers are identical and one of
|
|
// the packets is sync-packet, the regular packet is considered earlier. For
|
|
// two regular packets with the same sequence number and timestamp a primary
|
|
// payload is considered "smaller" than a secondary.
|
|
bool operator==(const Packet& rhs) const {
|
|
return (this->header.timestamp == rhs.header.timestamp &&
|
|
this->header.sequenceNumber == rhs.header.sequenceNumber &&
|
|
this->primary == rhs.primary &&
|
|
this->sync_packet == rhs.sync_packet);
|
|
}
|
|
bool operator!=(const Packet& rhs) const { return !operator==(rhs); }
|
|
bool operator<(const Packet& rhs) const {
|
|
if (this->header.timestamp == rhs.header.timestamp) {
|
|
if (this->header.sequenceNumber == rhs.header.sequenceNumber) {
|
|
// Timestamp and sequence numbers are identical. A sync packet should
|
|
// be recognized "larger" (i.e. "later") compared to a "network packet"
|
|
// (regular packet from network not sync-packet). If none of the packets
|
|
// are sync-packets, then deem the left hand side to be "smaller"
|
|
// (i.e., "earlier") if it is primary, and right hand side is not.
|
|
//
|
|
// The condition on sync packets to be larger than "network packets,"
|
|
// given same RTP sequence number and timestamp, guarantees that a
|
|
// "network packet" to be inserted in an earlier position into
|
|
// |packet_buffer_| compared to a sync packet of same timestamp and
|
|
// sequence number.
|
|
if (rhs.sync_packet)
|
|
return true;
|
|
if (this->sync_packet)
|
|
return false;
|
|
return (this->primary && !rhs.primary);
|
|
}
|
|
return (static_cast<uint16_t>(rhs.header.sequenceNumber
|
|
- this->header.sequenceNumber) < 0xFFFF / 2);
|
|
}
|
|
return (static_cast<uint32_t>(rhs.header.timestamp
|
|
- this->header.timestamp) < 0xFFFFFFFF / 2);
|
|
}
|
|
bool operator>(const Packet& rhs) const { return rhs.operator<(*this); }
|
|
bool operator<=(const Packet& rhs) const { return !operator>(rhs); }
|
|
bool operator>=(const Packet& rhs) const { return !operator<(rhs); }
|
|
};
|
|
|
|
// A list of packets.
|
|
typedef std::list<Packet*> PacketList;
|
|
|
|
} // namespace webrtc
|
|
#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_PACKET_H_
|