CN105338341B - Restore the method and device of real-time video code stream - Google Patents
Restore the method and device of real-time video code stream Download PDFInfo
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Abstract
The invention discloses the method and devices of reduction real-time video code stream, wherein this method comprises: crawl network card data, obtains packet capturing file；The read data packet from packet capturing file, from the data packet header acquisition time of data packet stab, and determine data packet packet content in bit stream data length；Bit stream data is extracted from packet content according to determining length；Bit stream data player is sent to according to timestamp to play out.The present invention program can be improved the analysis efficiency of video code flow.
Description
Technical field
The present invention relates to video code flow processing techniques, more particularly to the method and device of reduction real-time video code stream.
Background technique
After data collection terminal carries out data acquisition, client is transferred to by go-between.It is laggard that client receives data
Row plays, to check the scene situation of collection terminal.Under normal circumstances, the video code flow clear and smooth of client terminal playing, can be accurate
The situation of shooting scene is monitored.But in some cases, the video code flow of client terminal playing is abnormal, frame-skipping, card occurs
Phenomena such as pausing, is fuzzy, cannot achieve the purpose that monitoring；In this case, it needs to analyze video code flow, to determine event
Hinder the position occurred, is safeguarded.
The existing scheme analyzed video code flow includes: the video capture device of either client or front end,
All it is that data are sended and received by network interface card, grabs network card data using packet catcher；Then the number artificially packet capturing obtained
It is whether normal with the data at the corresponding network interface card of determination according to being analyzed.The program needs to analyze personnel and has certain network base
Plinth knowledge understands ICP/IP protocol principle and understands the use of packet catcher.The network card data grabbed whithin a period of time
It is all data by network interface card, may includes uninterested data portion, this partial data is unrelated with video code flow；This
Just need to analyze personnel to conscientiously and patiently parsing and identifying outside packet capturing tray, to determine the video codes for passing through network interface card
It whether normal flows.
To sum up, the existing method that video code flow is analyzed need to analyze personnel artificially to packet capturing file carry out parsing and
Identification, efficiency is lower, larger workload.
Summary of the invention
The present invention provides a kind of method for restoring real-time video code stream, this method can be improved the analysis effect of video code flow
Rate.
The present invention provides a kind of device for restoring real-time video code stream, which can be improved point of video code flow
Analyse efficiency.
A method of reduction real-time video code stream, this method comprises:
Network card data is grabbed, packet capturing file is obtained；
The read data packet from packet capturing file is stabbed from the data packet header acquisition time of data packet, and determines data packet
The length of bit stream data in packet content；
Bit stream data is extracted from packet content according to determining length；
Bit stream data player is sent to according to timestamp to play out.
A kind of device restoring real-time video code stream, the device include that packet capturing module, file read module and code stream are sent
Module；
The packet capturing module grabs network card data, obtains packet capturing file；
The file read module, the read data packet from the packet capturing file；It is obtained from the data packet header of data packet
Timestamp, and determine data packet packet content in bit stream data length；According to determining length from packet content
Extract bit stream data；The video code flow of the timestamp and extraction that will acquire is sent to the code stream sending module；
The code stream sending module receives timestamp and bit stream data from the file read module, according to the time
Bit stream data is sent to player and played out by stamp.
From above scheme as can be seen that in the present invention, network card data is grabbed, packet capturing file is obtained；It is read from packet capturing file
Data packet is taken, is stabbed from the data packet header acquisition time of data packet, and bit stream data in the packet content of determining data packet
Length；Bit stream data is extracted from packet content according to determining length；Bit stream data is sent to broadcasting according to timestamp
Device plays out.The video image of broadcasting is the real-time video code stream image of reduction, can be determined by the video image of broadcasting
It is whether normal via the data at corresponding network interface card.Using the present invention program, can automatically by the data convert obtained from network interface card at
Real-time video code stream, thus, the analysis efficiency of video code flow is improved, artificial workload is greatly reduced.
Detailed description of the invention
Fig. 1 is the method schematic flow chart of present invention reduction real-time video code stream；
Fig. 2 is the method flow diagram example of present invention reduction real-time video code stream；
Fig. 3 is the application schematic diagram that client carries out file packet capturing at network interface card；
Fig. 4 is the composed structure schematic diagram of PCAP format packet capturing file；
Fig. 5 is the schematic diagram data that Fig. 4 packet capturing file includes；
Fig. 6 is the composed structure schematic diagram of packet content in Fig. 4；
Fig. 7 is each section schematic diagram data of packet content in Fig. 4；
Fig. 8 is the timestamp field schematic diagram that data packet header includes in Fig. 4；
Fig. 9 is the application scenarios schematic diagram of transmission network error；
Figure 10 is the apparatus structure schematic diagram of present invention reduction real-time video code stream.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is further described.
The existing method analyzed video code flow needs to analyze personnel and artificially packet capturing file is parsed and identified,
Its efficiency is lower, larger workload.In order to solve the technical problem, the present invention obtains packet capturing file from network interface card, and is based on grabbing
APMB package automatic reduction obtains real-time video code stream, can be determined according to the video code flow that reduction obtains via at corresponding network interface card
Whether data are normal.To improve the analysis efficiency of video code flow, greatly reduce artificial workload.
Referring to Fig. 1, for the method schematic flow chart of present invention reduction real-time video code stream comprising following steps:
Step 101, network card data is grabbed, packet capturing file is obtained.
The either video capture device of client or front end is all that data are sended and received by network interface card, is used
Packet catcher grabs network card data, obtains packet capturing file.
Step 102, the read data packet from packet capturing file is stabbed from the data packet header acquisition time of data packet, and is determined
The length of bit stream data in the packet content of data packet.
At least one data packet in packet capturing file comprising grabbing.Comprising in data packet header and data packet in data packet
Hold, include bit stream data in packet content, data packet header includes the timestamp of crawl bit stream data, also, according to data
The auxiliary informations such as packet format can obtain the length of bit stream data via simple calculating.
Bit stream data is usually the data of application layer, and the data packet for including in packet capturing file may be only comprising about code stream
The data packet of data, it is also possible to also include the data packet of other business；For further perfect scheme, from the data packet of data packet
Before head acquisition time stamp, this method further include: whether the application layer data for judging data packet is bit stream data, if so,
Then execute described the step of stabbing from the data packet header acquisition time of data packet；Otherwise, continue to read next in packet capturing file
Data packet executes the step of whether application layer data for judging data packet is bit stream data.
Step 103, bit stream data is extracted from packet content according to determining length.
After knowing length of the bit stream data in packet content, bit stream data can be extracted.
Step 104, bit stream data player is sent to according to timestamp to play out.
After knowing bit stream data and corresponding timestamp, based on timestamp bit stream data can be sent to player into
Row plays, to restore real-time video code stream.Various ways realization can be used in this step, can be set as needed, carry out below
For example:
Current time: being adjusted to the timestamp of first data packet by mode one, in subsequent processing, reaches each data packet
When video code flow timestamp, the broadcasting of corresponding video code stream is just carried out.
Mode two: it is described bit stream data is sent to player and played out according to timestamp include:
Judge whether it is first data packet, is played out if it is, bit stream data is sent to player；Otherwise,
Calculate the difference of the timestamp of current data packet and the timestamp of a upper data packet；
Judge whether the interval between current time and the time for sending upper data packet video code flow reaches the difference,
It is played out if it is, bit stream data is sent to player；Otherwise, it continues waiting for.
Using the present invention program, the bit stream data of various formats can be restored, correspondingly, the packet capturing file grabbed
Include real-time transport protocol (RTP, Real-time Transport Protocol) format, program stream (PS, Program
Stream) the bit stream data of format or transport stream (TS, Transport Stream) format etc..
In the present invention, the read data packet from packet capturing file is stabbed from the data packet header acquisition time of data packet, and is determined
The length of bit stream data in the packet content of data packet；Bit stream data is extracted from packet content according to determining length；
Bit stream data player is sent to according to timestamp to play out.The video image of broadcasting is the real-time video code stream figure of reduction
Picture can be determined by the video image of broadcasting via whether the data at corresponding network interface card are normal.It, can be certainly using the present invention program
The data convert that will be obtained from network interface card is moved into real-time video code stream, thus, the analysis efficiency of video code flow is improved, is subtracted significantly
Artificial workload is lacked.
It is described play out after, further, can also according to client terminal playing code stream situation and data acquire
The code stream situation that end plays carries out accident analysis；The code stream situation in client terminal playing is to carry out network interface card number in client
According to the code stream situation played in the player of standard after crawl；The code stream situation played in data collection terminal is, in number
The code stream situation played in the player of standard after network card data crawl is carried out according to collection terminal.Specifically:
It is also normal in the code stream that data collection terminal plays, it is determined that client if the code stream in client terminal playing is normal
Broadcasting mechanism there are failures；
It is normal in the code stream that data collection terminal plays, it is determined that transmission network if the code stream in client terminal playing is abnormal
There are data transmission failures for network；
If abnormal in the code stream that data collection terminal plays, it is determined that there are failures for the data processing of data collection terminal.
Below by the process of Fig. 2, the method for present invention reduction real-time video code stream is illustrated comprising with
Lower step:
Step 201, network card data is grabbed, packet capturing file is obtained.
The either video capture device of client or front end is all that data are sended and received by network interface card, is used
Packet catcher grabs network card data, obtains packet capturing file.As shown in figure 3, being grabbed at the network interface card of client for packet catcher
Data, be the data that network interface card receives.It is also possible that the data sent to network interface card in video capture device grab.
For network interaction program, can data accurately be transmitted and reception is to application work result quality
Direct acting factor.It is straight usually using packet catcher the case where in order to judge network data transmission during engineering development
Connect and packet capturing carried out to network interface card, essence is exactly all to have copied a duplication to by the data of network interface card, then according to the time and
Agreement etc. is shown, and is saved according to certain format.Common packet catcher is wireshark under Windows,
The most commonly used is tcpdump below linux operating system.In use, opening packet catcher, selection needs the network interface card of packet capturing, then
Selection filter condition (because not all data are all interested target datas) as needed, then starts packet capturing.And
Afterwards, packet capturing program begins to collect network card data；After a certain period of time, stop packet capturing, this period of time can be entered and left
The data of network interface card are accurately got, and then save into file, obtain packet capturing file.So packet capturing file is exactly in a period of time
It is interior, meet the set of all data for flowing through network interface card of filter condition.It is accurate, detailed that it has the characteristics that.And packet capturing be by
It is carried out according to the sequence of data packet one by one.
The selection of packet catcher is illustrated below.Since there are different packet catchers, and the packet capturing text saved
Part format is also not quite similar.Only wireshark packet catcher just has the preservation of 10 multiple formats.And it is directed to each tray
Formula, storage mode of the data in packet capturing file are different.But although format is various, these packet catchers are all
Be it is compatible, can save File As the packet capturing of any format another format, be converted.In the present invention, in order to
Simplify development difficulty, can also only support a kind of analysis of packet capturing format.For the packet capturing file of extended formatting, packet capturing can be used
Tool saves as required format.
As shown in figure 4, the packet capturing file format fairly simple for one kind, referred to as PCAP format.The packet capturing file of the format
It is made of top of file, data packet header and packet content.Each data packet header and corresponding packet content composition one
A data packet.Top of file contains the additional informations such as version, and length is fixed as 24 bytes.It is each data later
The information of packet.Each data packet includes header information and data information two parts again, in the data packet in data information, that is, figure
Hold.Header information describes the information such as length and the timestamp of the data packet, and data information is the data that network interface card really grabs.
Shown in fig. 5 is the binary content of a packet capturing file, it can be found that being consistent with the format that is analyzed above.
Step 202, the read data packet from packet capturing file.
Step 203, whether the application layer data for judging data packet is bit stream data, if so, 204 are thened follow the steps, it is no
Then, continue to read next data packet from packet capturing file, return and execute whether the application layer data for judging data packet is code stream
The step of data.
Bit stream data is usually the data of application layer, and the data packet for including in packet capturing file may be only comprising about code stream
The data packet of data, it is also possible to also include the data packet of other business；In order to be further simplified operation, other business are first excluded
Data packet.
Step 204, it is stabbed from the data packet header acquisition time of data packet.
Packet catcher records crawl corresponding data packet in data packet header in real time during carrying out data packet crawl
Time, i.e. timestamp described in this step.
Step 205, the length of bit stream data in the packet content of data packet is determined.
Since the data in packet capturing file are the data that network interface card sends or receives, not by any network protocol stack
Processing, and bit stream data is usually the data of application layer, need to analyze the information in each packet content, to get really
Bit stream data.In this example, the structure of packet content is as shown in fig. 6, include ethernet data frame head, IP data head
Portion, TCP data head and RTP data, RTP data, that is, bit stream data.
The length of bit stream data can be obtained via simple calculating according to auxiliary informations such as data packet formats.With Fig. 6's
Example is illustrated, and in the example, data packet header contains the total length of corresponding data packet content, and Ethernet data frame head
Portion, IP data header contain the length information of each component part itself again in TCP data head, subtract front with total length
The preceding degree of three component parts can obtain the length of RTP data.Composition data packet content each section has been marked in Fig. 7 in detail
Binary message.
Step 206, bit stream data is extracted from packet content according to determining length.
Know bit stream data packet content length from after, can extract.
Step 207, first data packet for carrying out bit stream data extraction is judged whether it is, if it is, by bit stream data
Player is sent to play out；Otherwise, the difference of the timestamp of current data packet and the timestamp of a upper data packet is calculated.
The player can be specially standard player.
Step 208, judge whether the interval between current time and the time for sending upper data packet video code flow reaches
The difference plays out if it is, bit stream data is sent to player.
The reduction of video code flow is really realized, the problem of there are one the time.The present invention is accurately controlled bit stream data
It is sent to the time of player, improves the accuracy rate of reduction.As shown in figure 8, the temporal information example indicated for binary code.
Step 209, event is carried out according to the code stream situation in client terminal playing and in the code stream situation of data collection terminal broadcasting
Barrier analysis.
This step specifically includes:
It is also normal in the code stream that data collection terminal plays, it is determined that client if the code stream in client terminal playing is normal
Broadcasting mechanism there are failures；
It is normal in the code stream that data collection terminal plays, it is determined that transmission network if the code stream in client terminal playing is abnormal
There are data transmission failures for network；
If abnormal in the code stream that data collection terminal plays, it is determined that there are failures for the data processing of data collection terminal.
When the video code flow of client control is abnormal, it is used for quickly detecting immediately using the present invention program, in client
End and the progress network card data crawl of data collection terminal, and post analysis reason.Example as shown in Figure 9, in client, the view of reduction
4 packet loss of code stream in frequency code stream, and the video code flow restored after the data progress packet capturing sent to data collection terminal network interface card is normal, then
Can determine it is that go-between transmission failure occurs.
When specific implementation, if abnormal phenomenon occurs in the broadcasting of client, first having to judgement is the code stream received
The problem of problem or client terminal playing mechanism.Data grabber is carried out at client NIC at this time, also using the present invention program
Original is at real-time code stream and plays, if played normally, the abnormal phenomenon such as Caton, frame-skipping does not occur, then can quickly determine
Position, which goes out the code stream that receives, is that there is no problem, and determines the code flow broadcasting apparatus system of client handler there are problems；If
There have been the abnormal phenomenon such as Caton, frame-skipping, fuzzy when broadcasting, then it may determine that code stream itself there are problems, need
Further to judge caused by network transmission or code stream source is problematic.
Referring to Figure 10, for the apparatus structure schematic diagram of present invention reduction real-time video code stream, the device include packet capturing module,
File read module and code stream sending module；
The packet capturing module grabs network card data, obtains packet capturing file；
The file read module, the read data packet from the packet capturing file；It is obtained from the data packet header of data packet
Timestamp, and determine data packet packet content in bit stream data length；According to determining length from packet content
Extract bit stream data；The video code flow of the timestamp and extraction that will acquire is sent to the code stream sending module；
The code stream sending module receives timestamp and bit stream data from the file read module, according to the time
Bit stream data is sent to player and played out by stamp.
Preferably, the code stream sending module includes to judge sending submodule, first data packet is judged whether it is, if
It is that bit stream data is then sent to player and is played out；Otherwise, calculate current data packet timestamp and a upper data packet
The difference of timestamp；It is described to judge whether the interval between current time and the time for sending upper data packet video code flow reaches
Difference plays out if it is, bit stream data is sent to player.
Preferably, the file read module also judges data before the data packet header acquisition time of data packet stamp
Whether the application layer data of packet is bit stream data, if so, just stabbing from the data packet header acquisition time of data packet.
Preferably, the device further includes failure analysis module, adopted according to the code stream situation in client terminal playing and in data
Collect the code stream situation that end plays and carry out accident analysis, specifically include: if the code stream in client terminal playing is normal, being acquired in data
Hold the code stream played also normal, it is determined that there are failures for the broadcasting mechanism of client；If client terminal playing code stream not just
Often, normal in the code stream of data collection terminal broadcasting, it is determined that there are data transmission failures for transmission network；If in data collection terminal
The code stream of broadcasting is abnormal, it is determined that there are failures for the data processing of data collection terminal.
Preferably, the packet capturing file that the packet capturing module grabs includes realtime transmission protocol RTP format, program stream PS
The bit stream data of format or transport stream TS format etc..
The present invention analyzes packet capturing file, extracts the bit stream data of the inside, and is reduced into real time according to temporal information
Stream.Since the informative data of packet capturing file, record time are accurate, so that code stream has and original true code in real time made of reduction
Flow quite similar feature.Then again by broadcasting to real-time streams and analysis come search key throat floater the reason of.In this way, greatly
Ground improves efficiency, simplifies operating procedure.
Packet capturing file can be reduced into real-time code stream additionally, due to the device, the simulation of code stream equipment can also be applied to
Above.The ASCII stream file ASCII of different-format is passed into the device, the real-time code stream of corresponding format can be obtained, can be used as difference
The analog machine of code stream format.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (6)
1. a kind of method for restoring real-time video code stream, which is characterized in that this method comprises:
Network card data is grabbed in client and data collection terminal respectively, obtains packet capturing file, it is real when grabbing the network card data
When in data packet header record the time of crawl corresponding data packet, and using the time as timestamp；
The read data packet from packet capturing file is stabbed from the data packet header acquisition time of data packet, and determines the data of data packet
The length of bit stream data in packet content；
Bit stream data is extracted from packet content according to determining length；
Bit stream data local player is sent to according to timestamp to play out；
Wherein, it is described bit stream data is sent to local player and played out according to timestamp include:
Judge whether it is first data packet, is played out if it is, bit stream data is sent to local player；Otherwise,
Calculate the difference of the timestamp of current data packet and the timestamp of a upper data packet；
Judge whether the interval between current time and the time for sending upper data packet video code flow reaches the difference, if
It is that bit stream data is then sent to player and is played out；
According to the code stream situation in client terminal playing and in the code stream situation progress accident analysis that data collection terminal plays, specifically wrap
It includes:
It is also normal in the code stream that data collection terminal plays, it is determined that client is broadcast if the code stream in client terminal playing is normal
Putting mechanism, there are failures；
It is normal in the code stream that data collection terminal plays, it is determined that transmission network is deposited if the code stream in client terminal playing is abnormal
In data transmission failure；
If abnormal in the code stream that data collection terminal plays, it is determined that there are failures for the data processing of data collection terminal.
2. the method as described in claim 1, which is characterized in that described to stab it from the data packet header acquisition time of data packet
Before, this method further include:
Whether the application layer data for judging data packet is bit stream data, if it is, executing the data packet head from data packet
The step of portion's acquisition time is stabbed.
3. method according to claim 1 or 2, which is characterized in that the packet capturing file grabbed includes real-time transport protocol
The bit stream data of RTP format, program stream PS format or transport stream TS format.
4. it is a kind of restore real-time video code stream device, which is characterized in that the device include packet capturing module, file read module,
Code stream sending module and failure analysis module；
The packet capturing module grabs network card data in client and data collection terminal respectively, obtains packet capturing file；Described in crawl
When network card data, the time of crawl corresponding data packet is recorded in data packet header in real time, and using the time as timestamp；
The file read module, the read data packet from the packet capturing file；From the data packet header acquisition time of data packet
Stamp, and determine data packet packet content in bit stream data length；It is extracted from packet content according to determining length
Bit stream data；The video code flow of the timestamp and extraction that will acquire is sent to the code stream sending module；
The code stream sending module receives timestamp and bit stream data from the file read module, will according to timestamp
Bit stream data is sent to player and plays out；
Wherein, the code stream sending module includes to judge sending submodule, judges whether it is first data packet, if it is,
Bit stream data is sent to local player to play out；Otherwise, calculate current data packet timestamp and a upper data packet
The difference of timestamp；It is described to judge whether the interval between current time and the time for sending upper data packet video code flow reaches
Difference plays out if it is, bit stream data is sent to local player；
The failure analysis module, according to client terminal playing code stream situation and data collection terminal play code stream situation into
Row accident analysis, specifically includes: it is also normal in the code stream that data collection terminal plays if the code stream in client terminal playing is normal,
Then there are failures for the broadcasting mechanism of determining client；If the code stream in client terminal playing is abnormal, played in data collection terminal
Code stream it is normal, it is determined that there are data transmission failures for transmission network；If abnormal in the code stream that data collection terminal plays,
Determining the data processing of data collection terminal, there are failures.
5. device as claimed in claim 4, which is characterized in that the file read module is obtained from the data packet header of data packet
Before taking timestamp, also judge whether the application layer data of data packet is bit stream data, if so, just from the data packet of data packet
Head acquisition time stamp.
6. device as described in claim 4 or 5, which is characterized in that the packet capturing file that the packet capturing module grabs includes
The bit stream data of realtime transmission protocol RTP format, program stream PS format or transport stream TS format.
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| CN109451348A (en) * | 2018-10-29 | 2019-03-08 | 视联动力信息技术股份有限公司 | A kind of video flow detection method and apparatus |
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| CN103780610A (en) * | 2014-01-16 | 2014-05-07 | 绵阳师范学院 | Network data recovery method based on protocol characteristics |
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