CN108390794B - Method and system for calculating packet loss rate of streaming media data - Google Patents

Method and system for calculating packet loss rate of streaming media data Download PDF

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CN108390794B
CN108390794B CN201810111639.5A CN201810111639A CN108390794B CN 108390794 B CN108390794 B CN 108390794B CN 201810111639 A CN201810111639 A CN 201810111639A CN 108390794 B CN108390794 B CN 108390794B
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CN108390794A (en
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祝振东
刘强
曾信
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Fiberhome Telecommunication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0829—Packet loss
    • H04L43/0835—One way packet loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A method and a system for calculating the packet loss rate of streaming media data relate to the field of streaming media, and comprise a detection module, a data processing module and a calculation module, wherein the detection module detects whether a network data packet received by a client contains a PCR code, the data processing module analyzes the data packet containing the PCR code to obtain related data of the PCR code, and the result is the packet loss rate by calculating (number of bytes lost/(number of bytes actually received + number of bytes lost)) × 100%.

Description

Method and system for calculating packet loss rate of streaming media data
Technical Field
The present invention relates to the field of streaming media, and in particular, to a method and a system for calculating a packet loss rate of streaming media data.
Background
Today, internet transmission research is receiving wide attention, wherein the packet loss rate as an index for measuring network transmission performance is one of the research hotspots, and particularly in the application aspect of internet multimedia, the packet loss rate is related to audio/video playing and is even taken as an important index for measuring playing performance.
In multimedia applications, a media Stream is subjected to TS (Transport Stream) Packet encapsulation, and then encapsulated by using UDP (User data Packet Protocol) or RTP (Real-time Transport Protocol) before being sent out, because both UDP and RTP are not reliable transmission modes, Packet Loss inevitably occurs in a network transmission process, and the like, the so-called Packet Loss Rate (Loss traffic or Packet Loss Rate) refers to the ratio of the number of lost packets to the sent data group, the calculation method is that the number of lost packets/(the number of received packets + the number of lost packets) is × 100% ", the Packet Loss Rate is related to the Packet length and the Packet sending frequency, and the network Packet Loss Rate should be controlled within a certain range during normal transmission.
In an IPTV (Interactive personal TV, internet protocol television) system, if streaming media data is transmitted in a manner with an RTP packet header, a terminal may count a lost network data packet and a received network data packet by obtaining a sequence number field in the RTP packet header, calculate a packet loss rate of data in a network by using the lost network data packet and the received network data packet, and further determine a network status of the IPTV.
However, in the IPTV system, if the streaming media data does not carry the RTP packet header for data transmission, this method is not applicable. Therefore, for the situation that the streaming media data does not carry the RTP packet header, the packet loss rate of the data in the network cannot be calculated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for calculating the packet loss rate of streaming media data, which can calculate the packet loss rate of the data in an IPTV system under the condition that the streaming media data does not carry an RTP packet header for data transmission.
In order to achieve the above purpose, the invention adopts a method for calculating the packet loss rate of streaming media data, which comprises the steps that a client calculates the currently lost byte number through the time and the byte number of a currently received PCR code, a previously received PCR code and a first received PCR code, and the result is the packet loss rate through the calculation of [ the number of bytes lost/(the number of bytes actually received + the number of bytes lost) ] × 100%.
On the basis of the technical scheme, the client analyzes the data packet of the network, and records the time value of the first PCR code and the current system time of the PCR code.
On the basis of the technical scheme, when the client analyzes the currently received PCR code, according to the time value of the PCR code, the time difference T1 between the time value and the time value of the PCR code received last time and the number of bytes L1 actually received in the time difference T1 are calculated, and the current real-time code rate is calculated by dividing the number of bytes L1 by the time difference T1.
On the basis of the above technical solution, the client analyzes the currently received PCR code, and calculates the system time difference T2 between the PCR code and the PCR code received for the first time, and the number of bytes L2 received in the system time difference T2, L2 being the number of bytes of the received data packet in the time difference T2, according to the current system time of receiving the PCR code.
On the basis of the technical scheme, the system time difference T2 between the current received PCR code and the PCR code received for the first time is multiplied by the current real-time code rate to obtain the number of bytes received theoretically at present, and then the number of bytes actually received in the system time difference T2 is subtracted to obtain the number of bytes lost in the time difference T2.
On the basis of the technical scheme, the client and the server are connected, the data packet sent by the server is received, the data packet is unpacked into the TS sub-packet, and the PCR code exists in part of the TS sub-packet.
The invention also provides a system for calculating the packet loss rate of the streaming media data, which comprises the following steps:
the detection module is used for detecting whether the network data packet received by the client contains the PCR code;
the data processing module is used for analyzing the data packet containing the PCR code so as to obtain and record the related data of the PCR code;
and the calculating module is used for calculating the packet loss rate according to the acquired related data of the PCR code.
On the basis of the technical scheme, the data processing module comprises an analysis unit and a recording unit;
the analysis unit is used for analyzing the data packet containing the PCR code;
the recording unit is used for recording the related data of the PCR code analyzed by the analyzing unit.
On the basis of the technical scheme, the related data of the PCR code comprises the PCR code value, the current system time of receiving the PCR code and the number of bytes of the received data packet when the PCR code is received.
On the basis of the technical scheme, the calculation module comprises a time difference calculation unit and a byte calculation unit;
a time difference calculation unit for calculating a time difference T1 between a time value of a current PCR code and a time value of a previously received PCR code, and for calculating a system time difference T2 between the current PCR code and the first received PCR code;
and the byte calculation unit is used for calculating the number of bytes L1 actually received in the time difference T1 and calculating the number of bytes L2 actually received in the time difference T2, wherein L2 is the number of bytes of the accumulated received data packets in the time difference T2.
On the basis of the above technical solution, the calculation module calculates the current real-time code rate by dividing the byte number L1 by the time difference T1.
On the basis of the technical scheme, the calculation module multiplies the current real-time code rate by the system time difference T2 of the PCR code and the PCR code received for the first time to obtain the number of bytes received theoretically at present; and subtracting the actually received byte number L2 in the time difference T2 to obtain the missing byte number in the time difference T2.
The invention has the beneficial effects that:
since in the calculation of the packet loss rate of the streaming media data, the number of lost network packets is equal to the number of bytes lost divided by the size of the packet, and the number of received network packets is equal to the number of bytes actually received divided by the size of the packet, when the packet loss rate is calculated by [ the number of lost packets/(the number of received packets + the number of lost packets) ]' × 100%, the packet sizes of the numerator and the denominator cancel each other, that is, [ the number of bytes lost/(the number of actually received bytes + the number of bytes lost) ] - × 100% and the packet loss rate can be calculated by fully using the number of bytes of the packet.
The invention can calculate the packet loss rate of the network at the current time only by the byte number of the received data packet at the client when the transmission stream does not contain the RTP packet head on the basis of not modifying the network transmission protocol, thereby providing the measurement index of the IPTV playing quality and reflecting the network condition of the IPTV set-top box end in real time.
Drawings
Fig. 1 is a flowchart illustrating a method for calculating a packet loss rate of streaming media data according to a second embodiment of the present invention;
fig. 2 is a flowchart of a method for calculating a packet loss rate of streaming media data according to a third embodiment of the present invention;
fig. 3 is a schematic diagram of a system for calculating a packet loss rate of streaming media data according to a fourth embodiment of the present invention;
fig. 4 is a schematic diagram of a system for calculating a packet loss rate of streaming media data according to a fifth embodiment of the present invention;
fig. 5 is a schematic diagram of a system for calculating a packet loss rate of streaming media data according to a sixth embodiment of the present invention;
reference numerals:
the device comprises a detection module 1, a data processing module 2, an analysis unit 21, a recording unit 22, a calculation module 3, a time difference calculation unit 31 and a byte calculation unit 32.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention discloses a method for calculating the packet loss rate of streaming media data, which comprises the steps that a client calculates the number of currently lost bytes through the time and the number of bytes of a currently received PCR (program clock Reference) code, a PCR code received last time and a PCR code received first time, and calculates the packet loss rate through (number of bytes lost/(number of bytes actually received + number of bytes lost) ] × 100%.
The first embodiment:
the method for calculating the packet loss rate of the streaming media data is used in an IPTV system and can be used under the condition that the streaming media data does not carry an RTP packet header.
Firstly, a client establishes connection with a server, and the server starts to issue a data packet. And when receiving the data packet sent by the server, the client unpacks the data packet of the network into a plurality of TS sub-packets. When the client receives the TS sub-packet with the PCR code for the first time, the TS sub-packet is analyzed, and the related data of the first PCR code is recorded, wherein the related data comprises the PCR code value, the current system time of receiving the PCR code and the number of bytes of the data packet received cumulatively when the PCR code is received. The PCR code is the current time of the server injected into the TS sub-packets when the server side packs the data stream, and is used as the reference of the stream sending time of the server side. Because each data packet does not have a PCR code, the interval of the PCR specification is not more than 100ms, and a plurality of data packets are transmitted in the process of 100ms, PCR codes exist in some TS sub-packets, and PCR codes do not exist in some TS sub-packets. If the PCR code does not exist in the TS packet, recording is not performed.
Then, each time the client receives the PCR code, the code value of the current PCR code, the system time of receiving the current PCR code, and the number of bytes of the received data packet when receiving the PCR code are recorded, and the currently lost number of bytes is calculated according to the time difference T1 between the time value of the current received PCR code and the time value of the PCR code received last time, the number of bytes actually received L1 in the time difference T1 (L1 is the number of bytes of the data packet received in the time difference T1), the system time difference T2 between the current received PCR code and the PCR code received first time, and the number of bytes actually received L2 in the system time difference T2 (L2 is the number of bytes of the data packet received in the system time difference T2).
Then, the packet loss rate is calculated by [ number of bytes lost/(number of bytes actually received + number of bytes lost) ] × 100%.
Second embodiment:
as shown in fig. 1, the method for calculating the packet loss rate of streaming media data according to the present invention includes the following steps:
s201, the client side and the server side are connected, and the server side starts to send data packets. And when receiving the data packet sent by the server, the client unpacks the data packet of the network into a plurality of TS sub-packets.
S202, when the client receives the TS sub-packets with the PCR codes for the first time, analyzing the TS sub-packets, and recording the time value of the first PCR code and the system time for analyzing the PCR codes.
S203, when the client analyzes that a new PCR code arrives, firstly, recording the current PCR code value, calculating the time difference T1 between the time value of the current PCR code and the time value of the PCR code received last time and the number of bytes L1 actually received in the time difference T1 (L1 is the number of bytes of the data packet received in the time difference T1), taking the number of bytes L1 as a sampling value, and dividing the sampling value by the time difference T1 to calculate the current real-time code rate.
And S204, the client calculates the system time difference T2 between the PCR code and the PCR code received for the first time according to the current system time of receiving the PCR code, the number of bytes L2 actually received in the system time difference T2, and the number of bytes L2 is the number of bytes of the data packet received in the time difference T2.
S205, multiplying the current real-time code rate by the system time difference T2 between the current received PCR code and the PCR code received for the first time to obtain the number of bytes received in theory at present. And subtracting the actually received byte number L2 in the system time difference T2 from the theoretically received byte number to obtain the lost byte number.
S206, according to the [ number of bytes lost/(number of bytes actually received + number of bytes lost) ] × 100%, the calculated result is the packet loss rate.
The third embodiment:
as shown in fig. 2, the method for calculating the packet loss rate of streaming media data according to the present invention includes the following steps:
s301, the client side and the server side are connected, and the server side starts to issue data packets. And when receiving the data packet sent by the server, the client unpacks the data packet of the network into a plurality of TS sub-packets.
S302, when the client receives the TS sub-packets with the PCR codes for the first time, analyzing the TS sub-packets, and recording the time value of the first PCR code and the system time for analyzing the PCR codes.
And S303, when the client analyzes that a new PCR code arrives, firstly, recording the current PCR code value, calculating the time difference T1 between the time value of the current PCR code and the time value of the PCR code received last time and the number of bytes L1 actually received in the time difference T1 (L1 is the number of bytes of the data packet received in the time difference T1) according to the time value of the current PCR code, taking the number of bytes L1 as a sampling value, and dividing the sampling value by the time difference T1 to calculate the current real-time code rate.
Meanwhile, the client calculates the system time difference T2 between the PCR code and the PCR code received for the first time, and the number of bytes L2 actually received in the system time difference T2, i.e., the number of bytes L2 of the accumulated received data packet in the time difference T2, according to the current system time when the PCR code is received.
S304, multiplying the current real-time code rate by the system time difference T2 between the current received PCR code and the PCR code received for the first time to obtain the number of bytes received in theory at present. And subtracting the actually received byte number L2 in the system time difference T2 from the theoretically received byte number to obtain the lost byte number.
S305, according to [ the number of bytes lost/(the number of bytes actually received + the number of bytes lost) ] × 100%, the calculated result is the packet loss rate at the current time.
The steps of this embodiment are basically the same as those of the second embodiment, but in this embodiment, the real-time bitrate, the system time difference T2 and the number of actually received bytes L2 in the time difference T2 are calculated at the same time, and in the second embodiment, the real-time bitrate is calculated first, and then the number of actually received bytes L2 in the system time difference T2 and the time difference T2 are calculated.
The fourth embodiment:
the system for calculating the packet loss rate of streaming media data according to the present invention, as shown in fig. 3, includes a detection module 1, a data processing module 2, and a calculation module 3.
The detection module 1 is used for detecting whether the network data packet received by the client contains the PCR code. The client establishes connection with the server, the server starts to issue data packets, and the client receives the issued data packets and unpacks the data packets into TS sub-packets. The detection module 1 checks the TS packets to see if PCR codes are included.
The data processing module 2 is configured to parse a data packet containing the PCR code, where in this embodiment, the index TS packet is parsed to obtain related data of the PCR code, and record the related data. The related data of the PCR code comprises the PCR code value, the current system time of receiving the PCR code and the number of bytes of the received data packet when the PCR code is received.
The calculating module 3 is configured to calculate a packet loss rate according to the obtained related data of the PCR code. Specifically, according to the time value of the current PCR code, a time difference T1 between the time value and the time value of the PCR code received last time is calculated, and the number of bytes L1 actually received in the time difference T1 (L1 is the number of bytes of the data packet received in the time difference T1), and the current real-time code rate is calculated by dividing the number of bytes L1 by the time difference T1.
The calculating module 3 calculates the system time difference T2 between the PCR code and the PCR code received for the first time and the number of bytes L2 received in the system time difference T2, i.e. the number of bytes of the received data packet accumulated in the time difference T2, according to the current system time when the PCR code is received.
And multiplying the current real-time code rate by the time difference T2 between the current received PCR code and the first received PCR code to obtain the number of bytes which are theoretically received at present. And subtracting the number of actually received bytes in the system time difference T2 from the theoretically received number of bytes to obtain the number of lost bytes.
And (4) calculating according to (number of bytes lost/(number of bytes actually received + number of bytes lost)) × 100%, wherein the obtained result is the packet loss rate.
Fifth embodiment:
as shown in fig. 4, the system for calculating the packet loss rate of streaming media data in this embodiment includes a detection module 1, a data processing module 2 and a calculation module 3, where the data processing module 2 includes an analysis unit 21 and a recording unit 22.
The detection module 1 is used for detecting whether the network data packet received by the client contains the PCR code. The client establishes connection with the server, the server starts to issue data packets, and the client receives the issued data packets and unpacks the data packets into TS sub-packets. The detection module 1 checks the TS packets to see if PCR codes are included.
In the data processing module 2, the parsing unit 21 is configured to parse the TS packet to obtain data related to the PCR code. The recording unit 22 is used for recording the PCR code related data parsed by the parsing unit 21. The data related to the PCR code includes the PCR code value, the current system time when the PCR code is received, and the number of bytes of the received data packet accumulated when the PCR code is received, which are recorded by the recording unit 22.
The calculating module 3 is configured to calculate a packet loss rate according to the obtained related data of the PCR code.
Sixth embodiment:
as shown in fig. 5, the system for calculating the packet loss rate of streaming media data in this embodiment includes a detection module 1, a data processing module 2, and a calculation module 3. The data processing module 2 comprises an analysis unit 21 and a recording unit 22; the calculation module 3 includes a time difference calculation unit 31 and a byte calculation unit 32.
The detection module 1 is used for detecting whether the network data packet received by the client contains the PCR code. The client establishes connection with the server, the server starts to issue data packets, and the client receives the issued data packets and unpacks the data packets into TS sub-packets. The detection module 1 checks the TS packets to see if PCR codes are included.
The parsing unit 21 is configured to parse the TS packet to obtain data related to the PCR code. The recording unit 22 is used for recording the PCR code related data parsed by the parsing unit 21. The related data of the PCR code comprises the PCR code value, the current system time of receiving the PCR code and the number of bytes of the received data packet when the PCR code is received. The recording unit 22 records the code value of the PCR code, the system time, and the number of bytes of the packet each time it is received.
A time difference calculating unit 31, configured to calculate a time difference T1 from a time value of a PCR code received last time according to a time value of a current PCR code; the time difference calculating unit 31 is further configured to calculate a system time difference T2 between the PCR code and the first received PCR code according to the current system time of receiving the PCR code. The byte calculation unit 32 is used for calculating the number of bytes actually received L1 in the time difference T1 and also calculating the number of bytes received L2 in the system time difference T2.
The calculation module 3 calculates the current real-time code rate by dividing the time difference T1 by the number of bytes L1, and then obtains the theoretical received number of bytes by the theoretical received number of bytes being × T2, and finally calculates the packet loss rate by [ the number of bytes lost/(the number of bytes actually received + the number of bytes lost) ] × 100%.
The invention can completely use the byte number of the data packet to calculate the packet loss rate when the transport stream does not have the RTP packet head, thereby providing the measurement index of the IPTV playing quality and reflecting the network condition of the IPTV set-top box end in real time.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims (8)

1. A method for calculating the packet loss rate of streaming media data not carrying an RTP packet header is characterized by comprising the following steps:
the client calculates the number of bytes lost currently according to the time and the number of bytes of the PCR code received currently, the PCR code received last time and the PCR code received for the first time;
calculating by [ number of bytes lost/(number of bytes actually received + number of bytes lost) ] × 100%, wherein the result is the packet loss rate;
analyzing a data packet of a network by a client, and recording a time value of a first PCR code and the current system time of analyzing the PCR code;
when the client analyzes the currently received PCR code, calculating a time difference T1 between the time value of the PCR code and the time value of the PCR code received last time and the number of bytes L1 actually received in the time difference T1 according to the time value of the PCR code, and calculating the current real-time code rate by dividing the number of bytes L1 by the time difference T1;
the client analyzes the current received PCR code, and calculates the system time difference T2 between the PCR code and the PCR code received for the first time and the number of bytes L2 and L2 actually received in the system time difference T2, namely the number of bytes of the data packet received in the time difference T2 according to the current system time of receiving the PCR code;
and multiplying the current real-time code rate by the system time difference T2 between the current received PCR code and the PCR code received for the first time to obtain the number of bytes received theoretically at present, and subtracting the number of bytes L2 actually received in the system time difference T2 to obtain the number of bytes lost in the time difference T2.
2. The method for calculating packet loss rate of streaming media data according to claim 1, wherein: the client end is connected with the server end, receives the data packet sent by the server end, unpacks the data packet into TS sub-packets, and the PCR code exists in partial TS sub-packets.
3. A computing system for the method for computing packet loss probability of streaming media data according to claim 1, comprising:
the detection module is used for detecting whether the network data packet received by the client contains the PCR code;
the data processing module is used for analyzing the data packet containing the PCR code so as to obtain and record the related data of the PCR code;
and the calculating module is used for calculating the packet loss rate according to the acquired related data of the PCR code.
4. The computing system of claim 3, wherein: the data processing module comprises a parsing unit and a recording unit,
the analysis unit is used for analyzing the data packet containing the PCR code;
the recording unit is used for recording the related data of the PCR code analyzed by the analyzing unit.
5. The computing system of claim 4, wherein: the related data of the PCR code comprises PCR code value, current system time of receiving the PCR code and the number of bytes of the received data packet when the PCR code is received.
6. The computing system of claim 5, wherein: the calculation module includes a time difference calculation unit and a byte calculation unit,
a time difference calculation unit for calculating a time difference T1 between a time value of a current PCR code and a time value of a previously received PCR code, and for calculating a system time difference T2 between the current PCR code and the first received PCR code;
and the byte calculation unit is used for calculating the number of bytes L1 actually received in the time difference T1 and calculating the number of bytes L2 actually received in the time difference T2, wherein L2 is the number of bytes of the accumulated received data packets in the time difference T2.
7. The computing system of claim 6, wherein: the calculation module calculates the current real-time code rate by dividing the byte number L1 by the time difference T1.
8. The computing system of claim 7, wherein: the calculation module multiplies the current real-time code rate by the system time difference T2 of the PCR code and the PCR code received for the first time to obtain the number of bytes received in the current theory; and subtracting the actually received byte number L2 in the time difference T2 to obtain the missing byte number in the time difference T2.
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