CN111464880A

CN111464880A - Digital movie copy transmission system based on IPv4 and IPv9 hybrid network

Info

Publication number: CN111464880A
Application number: CN202010147611.4A
Authority: CN
Inventors: 楼培德; 赵思行; 谢建平; 许凌
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-07-28

Abstract

A digital cinema copy transmission system based on IPv4 and IPv9 hybrid networks, comprising: the server comprises an encoding module, a sending module and a control module, wherein the encoding module receives and encodes the digital movie file and sends the encoded digital movie file to the sending module; the client comprises a receiving module, a decoding module and a self-adaptive module; the decoding module receives and decodes the encoded digital movie file; the sending module sends the coded digital movie file to the receiving module through a UPD protocol in an IPv4/IPv9 network; the self-adaptive module calculates and records network parameters in a fixed time period, predicts the data transmission condition and feeds back the data transmission condition to the control module, and the control module controls the coding rate of the coding module and the sending rate of the sending module according to the feedback. The invention adopts UDP protocol as data transmission means, and dynamically adjusts the coding scheme and sending rate of the sender through the self-adaptive module, so that the transmission speed is ensured and improved to a certain extent.

Description

Digital movie copy transmission system based on IPv4 and IPv9 hybrid network

Technical Field

The invention relates to the technical field of digital film distribution, in particular to a digital film distribution and projection system.

Background

With the development of the film industry and the increase of the well-blowout type entertainment demand, the traditional digital film copy issuing mode has the problems of limited daily issuing quantity, inflexible issuing means and the like. Typically, a movie with a duration of 120min will reach a size of 200GB or more, and include multiple versions such as 2D, 3D, IMAX, macroscreen, etc. If a distributor plans to distribute a movie to theaters in various cities across the country using physical storage as a medium, about 2000 digital copies are required, totaling about 60 to 80 ten thousand yuan, with a large amount of work and low economic cost. In consideration of time cost, the period of disk mailing fluctuates widely between an online city and a remote area, and there is a risk of copyright leakage. If satellite transmission is used, it generally takes 6 hours to complete a transmission, which may result in data loss if severe weather is encountered, and additional requests for additional packets of data via an internet connection are required, which will certainly reduce transmission efficiency.

On the other hand, as can be seen from the current development situation of smart cities at home and abroad, the bottleneck problem of insufficient IP address resources in the Internet of things is not neglected, so that internet experts in China use foreign concepts and technologies for reference, an IPV9 protocol concept is provided, exploration and research for over ten years are carried out, finally breakthrough and substantial progress is achieved, and at present, related theories and technologies are developed and gradually popularized and commercialized. The IPV9 is no longer just a concept, a noun, but a core supporting technology for future network standards with proprietary intellectual property labels in our country. In the long run, the characteristics of rich address resources, high network bandwidth, high security and the like of the IPV9 undoubtedly provide a whole set of brand new innovative technical scheme for the development of new generation internet of things and for the intelligent network construction of cities.

Currently in the cinema field, the network still employs the conventional IPV4 technology. With the development of intelligent cities, the conventional IPV4 network technology has failed to satisfy the requirements of intelligence due to the problems of security and address, etc., and the IPV6 has not been popularized effectively due to insufficient compatibility. Cinema, a nationwide network entity, can be intelligentized by means of a new generation of internet technology IPV 9.

Digital cinema abandons the traditional form of film as a carrier, and video streams and audio streams of the cinema are made into a form of digital files by using a digital technology and then are distributed and propagated to showing sites through a physical disk, a satellite network and an IP network. However, physical disks are limited in geographical range and have a long mailing period in remote areas; satellite transmissions are subject to severe weather conditions that result in increased cost of repackaging. The larger transmission bandwidth and wider network coverage of the IP network are particularly advantageous for the digital cinema copy with large data volume. However, the traditional network distribution process has the problems of insufficient address capacity, limited user bandwidth, no guarantee of security, lack of centralized control and the like. IPv9, as a successor version of the internet protocol, can solve the drawbacks of current cinema networks and enable the networking of digital cinema distribution.

Disclosure of Invention

The purpose of the invention is realized by the following technical scheme.

In the scheme of digital film network distribution, IPv9 is used to configure IPv9 addresses for the film management servers of server and client to be accessed by external network and to be transmitted at high speed, so that the equipment can be managed uniformly.

Specifically, the invention provides a digital cinema copy transmission system based on IPv4 and IPv9 hybrid network, comprising: the server comprises an encoding module, a sending module and a control module, wherein the encoding module receives and encodes the digital movie file and sends the encoded digital movie file to the sending module; the client comprises a receiving module, a decoding module and a self-adaptive module; the decoding module receives and decodes the encoded digital movie file; the sending module sends the coded digital movie file to the receiving module through a UPD protocol in an IPv4/IPv9 network; the self-adaptive module calculates and records network parameters in a fixed time period, predicts the data transmission condition and feeds back the data transmission condition to the control module, and the control module controls the coding rate of the coding module and the sending rate of the sending module according to the feedback.

Preferably, the client sends a request message containing the distribution content to the server; the server analyzes the request message and performs segmentation processing on the digital movie file to obtain sub-file blocks; and the server side reads data from the subfile block, writes related information of the data to be sent into a data message, and performs RS interleaving encoding operation of a data message layer.

Preferably, the data packet is transformed based on a UDP packet header structure, including: source port number, destination port number, message byte length, checksum, message type, network status message, timestamp, coding and interleaving scheme information, sub-file unit serial number of the sub-file, data message coding and grouping number, and data message serial number.

Preferably, the server and the client configure an IPv4/IPv9 address and a UDP process port, respectively, to perform address communication handshake confirmation; the client side sequentially receives the data messages and manages and judges the missing condition of the messages through the dynamic dictionary; and after receiving the retransmission request, the server extracts the triple numbers to be retransmitted and forwards the triple numbers to the sending process of the server, and enters a stage of waiting for retransmission.

Preferably, the client uses a dynamic dictionary to store the information related to the sequence number in the received data packet, and uses the sequence number of the sub-file unit to which the client belongs as the key value of the outermost layer of the dynamic dictionary, the number of the data packet coding group as the key value of the second layer, and the sequence number of the data packet as the domain value to write into the array of the innermost layer: reading corresponding fields to update the dynamic dictionary after the client receives a data message; when the dynamic dictionary receives the update of the repeated sequence number, the newly received data message and the data content which is originally stored in the buffer area to be decoded are discarded, and the corresponding items in the dynamic dictionary are emptied.

Preferably, the predicting the data transmission condition comprises predicting the average packet loss rate and the average time delay in a certain period of the future by using the network parameters based on an L STM prediction model.

Preferably, the L STM model needs to be trained in advance, and the training comprises data acquisition and processing, decapsulation analysis, data cleaning, correlation analysis, data conversion and data reduction on network data packet files, data set partitioning, namely dividing an input data set into subsets comprising a training set, a verification set and an independent test set, and model training comprising model initialization, iterative training and model compression.

Preferably, the adaptive module determines the adjustment direction and amplitude of the coding scheme and the sending rate according to a difference congestion control formula of the prediction result and the upper limit tolerance range.

Preferably, the client performs a reverse interleaving operation on the received data packet blocks, and then performs RS decoding of the data packet hierarchy on the ordered data packet sequence.

Preferably, the system further includes a post-processing module, and after the preset upper timing limit is exceeded, the post-processing module verifies and recovers the whole block, writes data with integrity into a temporary file, or feeds back to the server and requests retransmission according to a packet loss condition recorded in the dynamic dictionary.

The invention discloses a digital film copy transmission system based on IPv4 and IPv9 mixed networks, which has the following beneficial effects: by adopting a network scheme of mixing IPv4 and IPv9, the method can realize that each movie management server of each cinema is configured with an IPv9 address which can be accessed by an external network and is transmitted at high speed, and can be compatible with the current IPv 4. In order to realize the issuing system, a UDP protocol is mainly adopted as a data transmission means, and the coding scheme and the sending rate of a sending party are dynamically adjusted through a self-adaptive module, so that the transmission speed is ensured and improved to a certain extent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 shows the modular composition of a digital cinema copy transmission system based on a hybrid network of IPv4 and IPv 9;

fig. 2 is a schematic diagram showing a structural variation of a UDP message header of a digital cinema copy transmission system based on a hybrid network of IPv4 and IPv 9;

FIG. 3 shows a file processing and encoding/decoding module of a digital cinema copy transmission system based on a hybrid network of IPv4 and IPv 9;

FIG. 4 is a flow and operation diagram illustrating interleaving and forward error correction coding according to an embodiment of the present invention;

FIG. 5 illustrates a transmit and receive communication framework diagram of a digital cinema copy transmission system according to an embodiment of the present invention;

fig. 6 is a diagram showing a dynamic dictionary management structure of a digital cinema copy transmission system according to an embodiment of the present invention.

Fig. 7 shows a flow diagram of adaptive rectification based on the prediction results.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the scheme of digital film networked distribution, IPv9 is used to configure IPv9 addresses for the film management servers of server and client to be accessed by external network and to be transmitted at high speed, so that the equipment can be managed uniformly.

Specifically, as shown in fig. 1, the present invention provides a digital cinema copy transmission system based on a mixed network of IPv4 and IPv9, which includes: the server comprises an encoding module, a sending module and a control module, wherein the encoding module receives and encodes the digital movie file and sends the encoded digital movie file to the sending module; the client comprises a receiving module, a decoding module and a self-adaptive module; the decoding module receives and decodes the encoded digital movie file; the sending module sends the coded digital movie file to the receiving module through a UPD protocol in an IPv4/IPv9 network; the self-adaptive module calculates and records network parameters in a fixed time period, predicts the data transmission condition and feeds back the data transmission condition to the control module, and the control module controls the coding rate of the coding module and the sending rate of the sending module according to the feedback.

The specific working process of the invention is as follows:

a1: the client sends request information containing distribution content to the server; and the server analyzes and synchronizes information from the request data message, and simultaneously, the server performs segmentation processing on the whole file.

As shown in fig. 2, the data packet is partially transformed based on the UDP packet header structure, and in addition to the original source port number, destination port number, packet byte length, checksum, the following are added:

the message type: the method is used for recording the type of the data message, occupies 2 bits, and has the main types of the data message of the sending message, the data message of the request message and the data message of the feedback state;

network status messages: the method mainly aims at the condition that the message type is a feedback message, occupies 30 bits and is responsible for transmitting network state information which is fed back by a client in a certain future time period on the basis of a prediction model and a congestion control algorithm according to corresponding receiving time and equivalent packet loss rate;

timestamp: the system is used for transmitting the sending time of the server to the client, occupies 4 bytes and is mainly used for helping the client to calculate the sending time interval of the data message;

coding and interleaving scheme: the device is used for recording the coding scheme and the interleaving degree adopted by the data packet, occupies 20 bits, and is convenient for the client to allocate the size of a storage area and decode;

the sub file unit sequence number: the system is responsible for identifying the sequence number of the sub-file unit to which the large file belongs after being divided, occupies 12 bits and mainly solves the transmission problem in multiple processes;

data message code group number: the system is responsible for identifying the code packet serial number to which the current data message belongs, namely the number of code packets sent to the client occupies 24 bits;

data packet sequence number: the relative sequence number of the data message in the coding packet is responsible for occupying 8 bits;

a2: and the server reads data from the subfile block, writes related information of the data to be sent into a data message, and performs RS interleaving encoding operation of a data message layer. RS coding, also known as Reed-solomon codes, is a type of forward error correction channel coding that is effective on the polynomial generated by correcting the oversampled data. When the receiver correctly receives enough points, it can recover the original polynomial even if many points on the received polynomial are distorted by noise interference. Interleaving coding is a communication technique for improving fading of mobile communication signals in an actual mobile communication environment. Burst errors in digital signal transmission are generated, and the burst errors can be dispersed and corrected by using an interleaving coding technique, thereby improving the transmission characteristics of mobile communication.

As shown in fig. 3 and fig. 4, each data packet has a unique three-segment identifier, which is the sub-file unit number, the coding group number, and the data packet serial number:

first, a preset redundancy is required;

RS encoding the data message sequence, namely performing dot product operation on the data block with the sequence and an encoding matrix, wherein a Good Cauchy distribution matrix is selected in the aspect of the encoding matrix;

then, interleaving operation is carried out on the basis of the coded data message blocks, namely, a certain rule is adopted to disturb the original sequence of the data blocks, and continuous burst packet loss errors are mainly dealt with;

as shown in fig. 1, 5 and 6, the basic communication framework of the sending module and the receiving module of the present invention is:

b1: and the server side transmits data to the receiving process port through the UDP process port in the IPv4/IPv9 network. And the server and the client configure IPv4/IPv9 addresses and UDP process ports respectively and perform address communication handshake confirmation.

B2: the client receives the data messages in sequence, and manages and judges the missing condition of the messages through a dynamic dictionary. The client uses a dynamic dictionary to store the information related to the sequence number in the received data packet, uses the sequence number of the belonged sub-file unit as the key value of the outmost layer of the dictionary, uses the data packet coding group number as the key value of the second layer, and writes the data packet sequence number as the domain value into the array of the innermost layer:

after each client receives a data message, reading the corresponding field to update the dynamic dictionary;

when the dynamic dictionary receives the update of the repeated sequence number, discarding both the newly received data message and the data content which is originally stored in the buffer area to be decoded, and emptying the corresponding item in the dynamic dictionary;

b3: and after receiving the retransmission request, the server extracts the triple numbers to be retransmitted and forwards the triple numbers to the sending process of the server, and enters a stage of waiting for retransmission. The server side extracts the triple number of the key data message lacking in the packet from the data message requesting retransmission:

a sending process forwarded to the server, entering a queue waiting for resending;

retrieve the data packets not received again during the new timing procedure;

as shown in fig. 1 and fig. 7, the control module and the adaptive module of the present invention work as follows:

and C1, calculating and recording network parameters in a fixed time period by the client through an adaptive module, and predicting the average packet loss rate and the average time delay in a certain future time period by using the parameter data of the stage on the basis of a L STM prediction model, wherein L STM (L ong Short-Term Memory) is a long-Short Term Memory network, is a time cycle neural network and is suitable for processing and predicting important events with relatively long intervals and relatively long delays in a time sequence.

The adaptive module of the client is responsible for calculating and recording parameter data which can be used as the input of an L STM prediction model, and on the basis, the average packet loss rate and the average time delay in a certain period in the future are predicted, wherein the model needs to be trained in advance and comprises the following steps:

acquisition and processing of data: decapsulation analysis, data cleaning, correlation analysis, data conversion, data reduction and the like of network data packet files;

partitioning the data set: dividing an input data set into more accurate subsets which are a training set, a verification set and an independent test set respectively;

model training: model initialization, iterative training, model compression and the like;

c2: and determining the adjustment direction and amplitude of the coding scheme and the sending rate according to the difference congestion control formula of the prediction result and the upper limit tolerance range.

After obtaining the prediction results, use:

calculating and deciding a transmission rate to be adjusted based on an adjustment function of the transmission rate;

calculating and deciding a coding scheme to be adjusted based on a coding scheme adjustment function;

c3: and the client returns the calculation result of the self-adaptive module to the server. The client synchronously updates the adjustment direction and the content and sends an adjustment signaling to the server, and each result may generate three adjustment strategies:

maintain the current protocol unchanged;

increased coding redundancy or increased transmission rate at maximum tolerance;

reduced coding redundancy or reduced transmission rate at minimum tolerance;

c4: after receiving the state feedback message, the server side adjusts the coding rate and the sending rate according to the message requirement, and updates the coding rate and the sending rate to the corresponding information segment of the data message in the next sending block implementation scheme. After the client sends the state feedback message:

emptying the data buffer of the previous monitoring and counting link;

preparing to receive the data message of the next time interval;

after receiving the state feedback message, the server:

adjusting the coding rate and the transmission rate;

updating the information segment corresponding to the next data message block to be sent;

as shown in fig. 1 and 3, the post-processing module and the decoding module of the present invention work as follows:

d1: the client performs reverse interleaving operation on the received data message blocks, and then performs RS decoding of the data message levels on the ordered data message sequence. The client performs the following operations on the received data message block:

inversely interleaving and sequencing and updating the received data message membership number to the dynamic dictionary;

then RS decoding of data message level is carried out on the ordered data message sequence;

d2: and after the preset upper limit of timing is exceeded, starting verification and recovering the whole block, if the data part has integrity, writing the content into a temporary file, otherwise, feeding back to the server side according to the packet loss condition recorded in the dynamic dictionary and requesting retransmission.

After the timing upper limit is exceeded, the whole block is verified and recovered, namely the data block and the check block which are not lost are recombined into a matrix and then the matrix and the inverse matrix of the encoding matrix are subjected to dot product operation:

if the decoding is successful, writing the part of the content into a temporary file;

and if the decoding fails, feeding back to the server side according to the packet loss condition recorded in the dynamic dictionary and requesting retransmission.

The invention discloses a digital movie copy transmission method based on IPv4 and IPv9 mixed networks, which has the following beneficial effects: by adopting a network scheme of mixing IPv4 and IPv9, the method can realize that each movie management server of each cinema is configured with an IPv9 address which can be accessed by an external network and is transmitted at high speed, and can be compatible with the current IPv 4. In order to realize the issuing method, a UDP protocol is mainly adopted as a data transmission means, and the coding scheme and the sending rate of a sending party are dynamically adjusted through a self-adaptive module, so that the transmission speed is ensured and improved to a certain extent.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A digital cinema copy transmission system based on IPv4 and IPv9 hybrid networks, comprising:

the server comprises an encoding module, a sending module and a control module, wherein the encoding module receives and encodes the digital movie file and sends the encoded digital movie file to the sending module;

the client comprises a receiving module, a decoding module and a self-adaptive module; the decoding module receives and decodes the encoded digital movie file; wherein the content of the first and second substances,

the sending module sends the coded digital movie file to the receiving module through a UPD protocol in an IPv4/IPv9 network;

the self-adaptive module calculates and records network parameters in a fixed time period, predicts the data transmission condition and feeds back the data transmission condition to the control module, and the control module controls the coding rate of the coding module and the sending rate of the sending module according to the feedback.

2. The system for transferring digital cinema copy according to claim 1 based on IPv4 and IPv9 hybrid network,

the client sends a request message containing distribution content to the server; the server analyzes the request message and performs segmentation processing on the digital movie file to obtain sub-file blocks;

and the server side reads data from the subfile block, writes related information of the data to be sent into a data message, and performs RS interleaving encoding operation of a data message layer.

3. The system for transferring digital cinema copy according to claim 2 based on IPv4 and IPv9 hybrid network,

the data message is transformed based on a UDP message header structure, and the method comprises the following steps: source port number, destination port number, message byte length, checksum, message type, network status message, timestamp, coding and interleaving scheme information, sub-file unit serial number of the sub-file, data message coding and grouping number, and data message serial number.

4. The system for transferring digital cinema copy according to claim 3 based on IPv4 and IPv9 hybrid network,

the server and the client are respectively configured with an IPv4/IPv9 address and a UDP process port for address communication handshake confirmation;

the client side sequentially receives the data messages and manages and judges the missing condition of the messages through the dynamic dictionary;

and after receiving the retransmission request, the server extracts the triple numbers to be retransmitted and forwards the triple numbers to the sending process of the server, and enters a stage of waiting for retransmission.

5. The system for transferring digital cinema copy according to claim 4 based on IPv4 and IPv9 hybrid network,

the client uses the dynamic dictionary to store the information related to the sequence number in the received data packet, and uses the sequence number of the belonged sub-file unit as the key value of the outermost layer of the dynamic dictionary, the code division group number of the data packet as the key value of the second layer, and the sequence number of the data packet as the domain value to be written into the array of the innermost layer: reading corresponding fields to update the dynamic dictionary after the client receives a data message; when the dynamic dictionary receives the update of the repeated sequence number, the newly received data message and the data content which is originally stored in the buffer area to be decoded are discarded, and the corresponding items in the dynamic dictionary are emptied.

6. The system for transferring digital cinema copy according to claim 1 based on IPv4 and IPv9 hybrid network,

the predicting the data transmission condition comprises:

and based on an L STM prediction model, predicting the average packet loss rate and the average time delay in a certain period of the future by using the network parameters.

7. The system for transferring digital cinema copy according to claim 6 based on IPv4 and IPv9 hybrid network,

the L STM model needs to be trained in advance, including:

data acquisition and processing, namely decapsulation analysis, data cleaning, correlation analysis, data conversion and data reduction of network data packet files;

dividing a data set, namely dividing an input data set into subsets, wherein the subsets comprise a training set, a verification set and an independent test set;

and model training, including model initialization, iterative training and model compression.

8. The system for transferring digital cinema copy according to claim 1 based on IPv4 and IPv9 hybrid network,

and the self-adaptive module determines the adjustment direction and amplitude of the coding scheme and the sending rate according to the prediction result and a difference congestion control formula of the upper limit tolerance range.

9. The system for transferring digital cinema copy according to claim 2 based on IPv4 and IPv9 hybrid network,

and the client performs reverse interleaving operation on the received data message blocks and then performs RS decoding of the data message hierarchy on the ordered data message sequence.

10. The system for transferring digital cinema copy according to claim 9 based on a hybrid network of IPv4 and IPv9,

the system further comprises a post-processing module, and after the preset timing upper limit is exceeded, the post-processing module verifies and recovers the whole block, and writes data with integrity into a temporary file, or feeds back to the server side according to the packet loss condition recorded in the dynamic dictionary and requests retransmission.