CN102148813B - Media content transmission method and system - Google Patents

Abstract

Embodiments of the present invention provide a method and system for transmitting media content. The method mainly includes: after receiving the transmission request of the media content sent by the user terminal, the control server establishes a transmission control protocol TCP connection with the user terminal, and sends transmission parameters of the media content and a transmission instruction of the media content to the media server, and the media content The transmission parameters include the source address of the TCP connection of the control server, the destination address and the current sequence number of the TCP message, so that the media server constructs the TCP message of the media content according to the transmission parameters of the media content, and according to the media content The content transmission instruction sends the TCP packet of the media content to the user terminal. The embodiment of the present invention realizes that the media server uses the TCP connection between the control server and the user terminal to transmit media content to the user terminal, thus avoiding the problem of NAT traversal in UDP mode interaction, and overcoming the need to occupy two bandwidths on the control server side and Problems with excessive consumption of control server resources.

Description

Method and system for transmitting media content

technical field

The present invention relates to the field of communication technology, in particular to a method and system for transmitting media content.

Background technique

As an important form of "integration of three networks", interactive TV has become the key business direction of the development of the communication industry, and the scale of its end users is expanding rapidly. The main business form of interactive TV is to provide users with audio and video services such as live broadcast, on-demand, recorded broadcast, time-shifting, and other value-added media services based on IP networks through user terminals.

In order to ensure the service experience of end users, a CDN (Content Delivery Network) system is usually dedicated to pushing media content to a media server deployed at the edge of the network, and providing media content transmission services to edge nodes through the media server. Due to the huge number of edge nodes, storing all content on the edge nodes of the CDN will require a large amount of storage resources. Due to the long tail effect, about 80% of user requests will focus on 20% of the media content. Based on this phenomenon, CDNs often only store popular content on edge nodes. However, with the continuous deepening of media digitization, the amount of media content is growing explosively. Even if only the top 20% of popular content is stored on CDN edge nodes, it will still consume a large amount of storage resources. Further analysis of the end user's access model to media content, that is, media files, reveals that the number of accesses to the header of the media file is greater than the amount of access to the tail of the media file. In this case, each file is divided into multiple segments , storing only some of the hotter segments in edge nodes can further reduce the storage consumption of edge nodes. Another advantage of using fragmented storage is that fragments of a piece of media content can be evenly distributed on multiple servers at the edge node, which can achieve load balancing of the edge node servers to a large extent and realize the resource allocation of server resources. Take advantage of.

In the prior art, the first method for a media server to transmit media content to a user terminal is as follows: the user terminal sends a transmission request of media content, that is, a media file, to the control server, and the control server selects the corresponding media server according to the storage conditions of the above-mentioned media files, The media server sends the fragmented data packets of the media file to the user terminal until the entire media file is sent or the user terminal actively chooses to quit receiving the media file.

In the process of implementing the present invention, the inventors found that the first method in the prior art for transmitting media content from a media server to a user terminal has at least the following problems: there is a NAT (Network Address Translation, Network Address Translation) traversal problem. In this method, a TCP (Transmission Control Protocol, Transmission Control Protocol) mode is used for interaction between the control server and the user terminal, and a UDP (User Datagram Protocol, User Datagram Protocol) mode is used for interaction between the media server and the user terminal. When the user terminal is in the private network and the media server is in the public network, the media server is a NAT device. If the mapping relationship between the public network address and the private network address is not preset on the NAT device, the NAT device will not be able to forward UDP packets. to the user terminal. In addition, the interaction between the media server and the user terminal adopts the UDP mode, and the transmission quality of the media content needs to be guaranteed by an additional mechanism.

The second method in the prior art for a media server to transmit media content to a user terminal is as follows: the user terminal sends a transmission request for media content, that is, a media file, to the control server, and the control server selects a corresponding media server according to the storage conditions of the above-mentioned media files, The media server sends the data packet of the media file to the control server, and the control server forwards the received data packet to the user terminal until the entire media file is sent or the user terminal actively chooses to quit receiving the media file.

In the process of implementing the present invention, the inventors found that the second method of media server transmission of media content to user terminals in the prior art has at least the following problems: it needs to occupy double bandwidth to provide media content transmission services for a user terminal, and control The server also needs to undertake the forwarding function of data packets, which limits the concurrent processing capability of the control server.

Contents of the invention

Embodiments of the present invention provide a method and system for transmitting media content, so that the media server can transmit media content to the user terminal by utilizing the TCP connection between the control server and the user terminal.

A transmission system for media content, comprising: a control server, configured to establish a transmission control protocol TCP connection with the user terminal after receiving a transmission request of the media content sent by the user terminal, and send the media content to the media server Content transmission parameters; a media server configured to construct a TCP message of the media content according to the transmission parameters of the media content sent by the control server, and send the TCP message to the user terminal.

A control server, comprising: a transmission control protocol TCP connection processing module, configured to establish a bidirectional TCP connection with the user terminal when receiving a media content transmission request sent by the user terminal; a transmission control module, configured to The media content information selects a media server that provides corresponding media content to the user terminal, and sends a transmission instruction of the media content to the media server; and a TCP flow control module, configured to send the media content to the media server transmission parameters, so that the media server transmits the media content to the user terminal according to the transmission instruction and transmission parameters of the media content.

A media server, comprising: transmission control protocol TCP flow control module, used to receive transmission parameters and transmission instructions of media content sent by the control server; TCP message construction module, used to construct media content according to the transmission parameters of the media content and a transmission control module, configured to send the TCP message of the media content to the user terminal according to the transmission instruction of the media content.

It can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention that the embodiments of the present invention realize that the media server transmits media content to the user terminal using the TCP connection between the control server and the user terminal, which avoids the gap between the media server and the user terminal. The problem of NAT traversal when using UDP to interact with each other, and overcomes the problem of occupying two bandwidths and excessive consumption of server resources on the server side.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a system for transmitting media content to a user terminal according to Embodiment 1 of the present invention;

FIG. 2 is a specific structural diagram of a control server provided in Embodiment 1 of the present invention;

FIG. 3 is a specific structural diagram of a media server provided by Embodiment 1 of the present invention;

FIG. 4 is a processing flowchart of a method for transmitting media content to a user terminal provided by Embodiment 2 of the present invention;

FIG. 5 is a processing flowchart of a method for transmitting media content to a user terminal according to Embodiment 3 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to facilitate the understanding of the embodiments of the present invention, several specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

Embodiment one

A schematic structural diagram of a system for transmitting media content to a user terminal provided in this embodiment is shown in FIG. 1 , including the following devices:

The control server 11 is used to establish a two-way TCP connection with the user terminal 13 after receiving the transmission request of the media content sent by the user terminal 13, and send the transmission parameters of the media content and the transmission instructions of the media content to the media server 12, so as to realize Control of media content delivery. The transmission parameters of the media content include the source address, the destination address and the current sequence number of the TCP message of the TCP connection between the control server 11 and the user terminal 13 . ,

The media server 12 is configured to construct the TCP message of the media content according to the transmission parameters of the media content sent by the control server 11, and send the transmission instruction of the media content sent by the control server 11 to the user terminal 13. TCP packets describing the media content. The media server 12 may specifically be a streaming server.

The user terminal 13 is configured to establish a two-way TCP connection with the control server 11, and receive the TCP message of the media content sent by the media server 12. For the successfully received TCP message of the media content, a TCP response is sent to the control server 11; for the TCP message of the media content lost in network transmission, a TCP retransmission request is sent to the control server 11.

The concrete structure of above-mentioned control server 11 is shown in Figure 2, and above-mentioned control server 11 specifically can comprise:

The TCP connection processing module 111 is configured to establish a two-way TCP connection with the user terminal through TCP negotiation with the user terminal after receiving the media content transmission request sent by the user terminal 13 .

The transmission control module 112 is used to select the media server that provides the corresponding media content to the user terminal 13 according to the media content information in the transmission request after the TCP connection processing module 111 establishes the TCP connection with the user terminal 13 12. Send a media content transmission instruction to the media server 12.

The TCP flow control module 113 is used to send the transmission parameters of the media content to the media server 12 selected by the transmission control module 112, and the transmission parameters include the source address and the destination address of the TCP connection between the control server 11 and the user terminal 13 and the current sequence number of the TCP packet.

Further, the TCP connection processing module 111 is also used to perform heartbeat detection with the user terminal 13 to detect whether the TCP connection with the user terminal is normal.

Further, the transmission control module 112 is also configured to send a corresponding state switching instruction to the media server 12 according to the interaction information with the user terminal 13, to control the media server 12 to fast forward, rewind, jump , pause, play and other states to switch.

Further, the transmission control module 112 is also configured to send the TCP response response or TCP retransmission request to the media server 12 after receiving the TCP response response or the TCP retransmission request sent by the user terminal 13; During the switching process of the media server 12, after receiving the TCP response response or the TCP retransmission request sent by the user terminal 13, if the TCP sequence number corresponding to the TCP response response or the TCP retransmission request is less than or equal to that of the media server 12 before switching If the TCP sequence number corresponding to the TCP response or the TCP retransmission request is greater than the last TCP sequence of the media server 12 before switching, the TCP response or the TCP retransmission request is sent to the media server 12 before switching. number, send the TCP response response or the TCP retransmission request to the switched media server 12.

When the segments of the media content requested by the above-mentioned user terminal 13 are stored on multiple media servers 12:

Further, the transmission control module 112 is also used to select a plurality of media servers 12 to send media content to the user terminal 13, when the control server 11 receives the last TCP packet sent by the last media server 12 After the notification message of the serial number, the transmission instruction of the media content is sent to the next media server 12 .

Further, the TCP flow control module 113 is also used to send the media to the next media server 12 after the control server 11 receives the notification message carrying the sequence number of the last TCP message sent by the previous media server 12. The transmission parameters of the content, the transmission parameters include the source address and destination address of the TCP connection between the control server 11 and the user terminal 13, and the sequence number of the last TCP message carried in the notification message.

Thus, the next media server 12 takes over from the previous media server 12 and continues to send the TCP message of the media content to the user terminal 13 according to the received media content transmission instruction and media content transmission parameters.

The concrete structure of above-mentioned media server 12 is as shown in Figure 3, and above-mentioned media server 12 specifically can comprise:

The TCP flow control module 121 is configured to receive the transmission parameters of the above media content sent by the control server 11, and the transmission parameters include the source address, destination address and TCP message of the TCP connection between the control server 11 and the user terminal 13 the current serial number of . The above-mentioned transmission parameters of the media content are transmitted to the TCP packet construction module 122 .

The TCP message construction module 122 is configured to construct a TCP message of the media content according to the received transmission parameters of the media content sent by the TCP flow control module 121 . The sequence number of the first TCP message constructed by the TCP message construction module 121 is the current sequence number of the TCP message in the transmission parameter of the above-mentioned media content plus one, and the TCP message constructed by the TCP message construction module 121 is The source address and destination address are the source address and destination address in the transmission parameters of the media content.

The transmission control module 123 is configured to receive the transmission instruction of the above media content sent by the control server 11, and send the TCP message construction module 122 constructed by the TCP message construction module 122 to the user terminal 13 according to the above transmission instruction in the identity of the control server 11. TCP packets.

Further, the transmission control module 123 is also configured to switch between states such as fast forward, fast rewind, jump, pause, and play according to the state switching instruction sent by the control server 11 .

Further, the transmission control module 123 is also used for sending the next TCP message to the user terminal 13 after receiving the TCP response from the user terminal 13 forwarded by the control server 11; After forwarding the TCP retransmission request from the user terminal 13, the server 11 retransmits the corresponding TCP message to the user terminal 13.

Further, the transmission control module 123 is also configured to send all media in the fragments stored by the media servers 12 to the user terminal 13 when the fragments of the media content are stored on multiple media servers 12. After the content, send to the control server 11 a notification message carrying the sequence number of the last TCP message it sent.

This embodiment realizes that the media server uses the source address and destination address of the TCP connection between the control server and the user terminal to send a TCP message to the user terminal as the control server. Since the media server and the user terminal do not use the UDP method for interaction, the NAT traversal problem in the UDP method interaction is avoided, and the transmission quality of the media content does not need an additional mechanism to guarantee. Since the media data is sent to the user terminal through the media server instead of the control server, the problems of occupying two shares of bandwidth and excessive consumption of control server resources on the control server side are overcome.

This embodiment transmits the TCP message of the media content to the user terminal by storing the fragments of the media content on multiple media servers and combining with the TCP connection, thereby realizing that multiple media servers take over the sending of the media content to the user terminal. The TCP message can realize the load balancing of the media server and realize the full utilization of the media service resources.

In this embodiment, by controlling the server to forward the received TCP response or TCP retransmission request sent by the user terminal to the media server, it is realized that the media server sends subsequent or TCP packets for retransmitting media content.

Embodiment two

Based on the system for transmitting media content to a user terminal shown in FIG. 1 above, the processing flow of a method for transmitting media content to a user terminal provided by this embodiment is shown in FIG. 4 , including the following processing steps:

Step 41: After receiving the media content transmission request sent by the user terminal 13, the control server 11 establishes a TCP connection with the user terminal 13, and sends the media content transmission parameters and media content transmission instructions to the media server 12.

After receiving the media content transmission request sent by the user terminal 13, the control server 11 negotiates with the user terminal 13 on a protocol for transmitting media content, and determines which protocol is used to transmit the media content. The protocol for transmitting the media content may be TCP or UDP. When the TCP protocol is used for media content transmission, the control server 11 and the user terminal 13 establish a TCP connection through TCP negotiation.

The control server 11 determines the transmission parameters of the media content, and the transmission parameters include: the TCP source address of the TCP connection between the control server 11 and the user terminal 13, the TCP destination address, and the current sequence number of the TCP message of the TCP connection.

The control server 11 selects the media server 12 that provides media content to the user terminal 13 according to the media content information in the received transmission request, and sends the media content transmission parameters and media content transmission instructions to the media server 12.

Step 42, the media server 12 constructs a TCP message of the media content according to the received transmission parameters of the media content, and sends the TCP message of the media content to the user terminal 13 according to the received transmission instruction of the media content.

After receiving the transmission instruction of the media content and the transmission parameters of the media content, the media server 12 constructs a TCP message according to the transmission parameters of the media content. The sequence number of the first TCP message constructed by the above-mentioned media server 12 is the current sequence number of the TCP message in the transmission parameter of the above-mentioned media content plus one, and the source address and destination address of the constructed TCP message are the described The source address and destination address in the transmission parameters of the media content.

Then, the above-mentioned media server 12 sends the above-mentioned TCP message to the user terminal 13 in the identity of the control server 11 according to the transmission instruction of the above-mentioned media content.

This embodiment realizes that the media server uses the source address and destination address of the TCP connection between the control server and the user terminal to send a TCP message to the user terminal as the control server. Since the interaction between the media server and the user terminal does not use the UDP method, the NAT traversal problem in the UDP method interaction is avoided. Since the media data is sent to the user terminal through the media server instead of the control server, the problems of occupying two shares of bandwidth and excessive consumption of control server resources on the control server side are overcome.

Embodiment Three

Based on the system for transmitting media content to user terminals shown in Figure 1 above, and the specific structural diagrams of the control server shown in Figure 2 and the media server shown in Figure 3 above, this embodiment provides a system for transmitting media content to user terminals The processing flow of the content method is shown in Figure 5, including the following processing steps:

Step 51 , the control server 11 establishes a TCP connection with the user terminal 13 after receiving the media content transmission request sent by the user terminal 13 .

After the TCP connection processing module 111 in the control server 11 receives the transmission request of the media content sent by the user terminal 13, the above-mentioned TCP connection processing module 111 and the user terminal 13 negotiate a protocol for transmitting the media content, and determine which protocol to use for transmission media content. The above protocol for transmitting media content may be TCP protocol or UDP protocol. When negotiating to use TCP protocol to transmit media content, the TCP connection processing module 111 and the user terminal 13 establish a TCP connection through TCP negotiation.

The above-mentioned media content may include: media content such as RTSP (Real-time Transport Streaming Protocol, real-time streaming media transmission protocol), HTTP (Hypertext Transfer Protocol, hypertext transfer protocol) flow.

The user terminal 13 needs to periodically send a heartbeat message to the control server 11, and the TCP connection processing module 111 in the control server 11 returns a heartbeat response to the user terminal 13, and detects the above-mentioned user terminal through the heartbeat detection between the above-mentioned user terminal 13 and the control server 11 11 and the state of the TCP connection between the control server 13.

Step 52, the control server 11 sends the media content transmission parameters and the media content transmission instruction to the media server 13.

The TCP flow control module 113 in the above-mentioned control server 11 determines the transmission parameters of the media content, and the transmission parameters include: the TCP source address of the TCP connection between the control server 11 and the user terminal 13, the TCP destination address and the TCP message of the TCP connection current serial number etc.

The transmission control module 112 in the above-mentioned control server 11 selects the media server 12 that provides the corresponding media content to the user terminal 13 according to the media content information in the above-mentioned transmission request received, and sends the transmission parameters and media content of the above-mentioned media content to the media server 12. Content transfer instructions.

In practical applications, when the segments of the media content requested by the user terminal 13 to be transmitted are stored on multiple media servers 12, the transmission control module 112 in the control server 11 selects the multiple media servers 12 to send the media to the user terminal 13. content, sending the transmission parameters of the media content and the transmission instruction of the media content to the first media content server 12 among the plurality of media servers 12 that stores the initial segment of the media content.

Step 53: The media server 12 constructs a TCP message of the media content according to the received transmission parameters of the media content, and sends the TCP message of the media content to the user terminal 13 according to the received transmission instruction of the media content.

The TCP flow control module 121 in the media server 12 transmits the transmission parameters to the TCP message construction module 122 in the media server 12 after receiving the transmission parameters for transmitting the media content. Above-mentioned TCP message construction module 122 constructs TCP message according to the transmission parameter of above-mentioned media content, the sequence number of the first TCP message of structure is the current sequence number of the TCP message in the transmission parameter of above-mentioned media content plus one, The source address and destination address of the constructed TCP message are the source address and destination address in the transmission parameters of the media content.

Then, the transmission control module 123 in the media server 12 sends the above-mentioned TCP message to the user terminal 13 in the identity of the control server 11 according to the transmission instruction of the media content.

When the fragments of the media content requested by the above-mentioned user terminal 13 are stored on multiple media servers 12, after one media server 12 finishes sending the fragments of the media content it saves, the transmission control in the above-mentioned media server 12 The module 123 sends to the control server 11 a notification message carrying the sequence number of the last TCP packet sent by it. Control server 11 selects other media servers 12 to continue sending media content to the above-mentioned user terminal according to the sequence number of the last TCP message carried in the above-mentioned notification message and the storage situation of all fragments of the above-mentioned media content in each media server 12 , and send the transmission parameters of the media content and the transmission instruction of the media content including the serial number of the last TCP packet to the other media server 12. The other media server 12 constructs a TCP message according to the transmission parameters of the media content, and sends the TCP message to the user terminal 13 according to the transmission instruction of the media content.

The transmission control module 112 in the above-mentioned control server 11 is also used to send a corresponding state switching instruction to the media server 12 according to the interaction information with the user terminal 13, and the transmission control module 123 in the media server 12 receives the above-mentioned State switching command, switch between states such as fast forward, fast rewind, jump, pause, and play.

Step 54, after the user terminal 13 receives the TCP message of the media content sent by the media server 12, it returns a TCP response response or a TCP retransmission request to the control server 11, and the above-mentioned control server 11 forwards the above-mentioned TCP response response or TCP retransmission request to the media server 12.

After receiving the TCP message of the media content sent by the media server 12, the user terminal 13 sends a TCP response response to the control server 11 for the successfully received TCP message; Send a TCP retransmission request. The transmission control module 112 in the control server 11 forwards the received TCP response or TCP retransmission request sent by the user terminal 13 to the media server 12 .

During the process of media server switching, the control server 11 will still receive the TCP reply response or TCP retransmission request sent by the user terminal 13 . In this case, the control server 11 will forward the above-mentioned TCP response response or TCP retransmission request according to the following principles:

1. If the TCP sequence number corresponding to the TCP response or the TCP retransmission request is less than or equal to the last TCP sequence number of the media server 12 before switching, the transmission control module 112 in the control server 11 sends the TCP response response or the TCP retransmission request Send to the media server 12 before switching;

2. If the TCP sequence number corresponding to the TCP response or the TCP retransmission request is greater than the last TCP sequence number of the media server 12 before switching, then the transmission control module 112 in the control server 11 sends the TCP response response or the TCP retransmission request to The media server 12 after switching.

Step 55 , the media server 12 sends a follow-up or retransmission TCP message of the media content to the user terminal 13 according to the received TCP response or TCP retransmission request.

The transmission control module 123 in the media server 12, after receiving the TCP response that the control server 11 forwards, continues to send the TCP message of the follow-up media content to the user terminal; After receiving the TCP retransmission request, retransmit the A TCP packet of the corresponding media content.

In the process of switching the media server 12, the control server 12 receives the transmission parameters of the media content and the transmission instruction of the media content containing the sequence number of the last TCP message sent by the last media server 12 sent by the control server 11, the above-mentioned The media server 12 constructs a TCP message according to the transmission parameters of the media content, and sends the TCP message to the user terminal 13 taking over from the previous media server 12 .

This embodiment realizes that the media server uses the source address and destination address of the TCP connection between the control server and the user terminal to send a TCP message to the user terminal as the control server. Since the interaction between the media server and the user terminal does not use the UDP method, the NAT traversal problem in the UDP method interaction is avoided. Since the media data is sent to the user terminal through the media server instead of the control server, the problems of occupying two shares of bandwidth and excessive consumption of control server resources on the control server side are overcome.

This embodiment transmits the TCP message of the media content to the user terminal by storing the fragments of the media content on multiple media servers and combining with the TCP connection, thereby realizing that multiple media servers take over the sending of the media content to the user terminal. The TCP message can realize the load balancing of the media server and realize the full utilization of the media service resource.

In this embodiment, by controlling the server to forward the received TCP response or TCP retransmission request sent by the user terminal to the media server, it is realized that the media server sends subsequent or TCP packets for retransmitting media content.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

To sum up, the embodiment of the present invention realizes that the media server uses the source address and destination address of the TCP connection between the control server and the user terminal to send a TCP message to the user terminal as the control server. Since the interaction between the media server and the user terminal does not use the UDP method, the NAT traversal problem in the UDP method interaction is avoided. Since the media data is sent to the user terminal through the media server instead of the control server, the problems of occupying two shares of bandwidth and excessive consumption of control server resources on the control server side are overcome.

This embodiment transmits the TCP message of the media content to the user terminal by storing the fragments of the media content on multiple media servers and combining with the TCP connection, thereby realizing that multiple media servers take over the sending of the media content to the user terminal. The TCP message can realize the load balancing of the media server and realize the full utilization of the media service resource.

In this embodiment, by controlling the server to forward the received TCP response or TCP retransmission request sent by the user terminal to the media server, it is realized that the media server sends subsequent or TCP packets for retransmitting media content.

The embodiment of the present invention does not need to introduce an additional reliability mechanism of the application layer, has no additional requirements on user terminals and network equipment, reduces the complexity of implementation, and is suitable for the transmission of various media files such as RTSP, HTTP, and HTTP Streaming.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (11)

1. A transmission system for media content, characterized in that, comprising: The control server is used to establish a transmission control protocol TCP connection with the user terminal after receiving the transmission request of the media content sent by the user terminal, and send the transmission parameters of the media content to the media server; The media server is configured to construct a TCP message of the media content according to the transmission parameters of the media content sent by the control server, and send the TCP message to the user terminal; The transmission parameters of the media content include: the source address and destination address of the TCP connection established between the control server and the user terminal, and the current sequence number of the TCP message. 2. A control server, characterized in that, comprising: A Transmission Control Protocol TCP connection processing module, configured to establish a bidirectional TCP connection with the user terminal when receiving a media content transmission request sent by the user terminal; A transmission control module, configured to select a media server that provides corresponding media content to the user terminal according to the media content information in the transmission request, and send a transmission instruction of the media content to the media server; and A TCP flow control module, configured to send transmission parameters of the media content to the media server, so that the media server transmits the media content to the user terminal according to the transmission instructions and transmission parameters of the media content; The transmission parameters of the media content include: the source address of the TCP connection established between the control server and the user terminal, the destination address and the current serial number of the TCP message. 3. The control server according to claim 2, characterized in that: The TCP connection processing module is also used for performing heartbeat detection with the user terminal to detect whether the TCP connection between the control server and the user terminal is normal. 4. The control server according to claim 2, characterized in that: The transmission control module is further configured to send the TCP response response or TCP retransmission request to the media server after receiving the TCP response response or the TCP retransmission request sent by the user terminal; During the process of media server switching, after receiving the TCP response response or TCP retransmission request sent by the user terminal, if the TCP sequence number corresponding to the TCP response response or TCP retransmission request is less than or equal to the media server before switching If the last TCP sequence number of the TCP response or TCP retransmission request is sent to the media server before switching; if the TCP sequence number corresponding to the TCP response or TCP retransmission request is greater than the last TCP sequence number of the media server before switching TCP sequence number, then send the TCP response or TCP retransmission request to the switched media server. 5. The control server according to claim 2, wherein when the fragments of the media content requested by the user terminal are stored on multiple media servers: The transmission control module is also used to select a plurality of media servers to send media content to the user terminal, when the transmission control module receives the notification message carrying the serial number of the last TCP message sent by the previous media server , sending a transmission instruction of the media content to the next media server; The TCP flow control module is also used for sending the transmission parameters of the media content to the next media server after the transmission control module receives the notification message carrying the serial number of the last TCP message sent by the previous media server. 6. A media server, characterized in that, comprising: The transmission control protocol TCP flow control module is used to receive the transmission parameters and transmission instructions of the media content sent by the control server; A TCP message construction module, configured to construct a TCP message of the media content according to the transmission parameters of the media content; and A transmission control module, configured to send a TCP message of the media content to the user terminal according to a transmission instruction of the media content; The transmission parameters of the media content include: the source address of the TCP connection established between the control server and the user terminal, the destination address and the current serial number of the TCP message. 7. The media server according to claim 6, characterized in that: The transmission control module is further configured to send a subsequent TCP message to the user terminal after receiving the TCP response from the user terminal forwarded by the control server; After receiving the TCP retransmission request of the user terminal, retransmit the corresponding TCP message to the user terminal. 8. A method for transmitting media content, comprising: The control server receives the transmission request of the media content sent by the user terminal; Establishing a transmission control protocol TCP connection between the control server and the user terminal; Sending the transmission parameters of the media content and the transmission instructions of the media content to the media server, so that the media server constructs the TCP message of the media content according to the transmission parameters of the media content, and according to the transmission parameters of the media content a transmission instruction to send a TCP message of the media content to the user terminal; The transmission parameters of the media content include: the source address and destination address of the TCP connection established between the control server and the user terminal, and the current sequence number of the TCP message. 9. The transmission method of media content according to claim 8, is characterized in that, described method also comprises: After receiving the TCP response response or the TCP retransmission request sent by the user terminal, the TCP response response or the TCP retransmission request is sent to the media server. 10. The transmission method of media content according to claim 8, is characterized in that, described method also comprises: After receiving the TCP response response or the TCP retransmission request sent by the user terminal, if the TCP sequence number corresponding to the TCP response response or the TCP retransmission request is less than or equal to the last TCP sequence number of the media server before switching, then the The TCP response or the TCP retransmission request is sent to the media server before the switch; if the TCP sequence number corresponding to the TCP response or the TCP retransmission request is greater than the last TCP sequence number of the media server before the switch, the TCP A reply response or a TCP retransmission request is sent to the switched media server. 11. The transmission method of media content according to claim 8, is characterized in that, described method also comprises: When the fragmentation of the media content requested by the user terminal is stored on multiple media servers, select multiple media servers to send the media content to the user terminal, and when receiving the last TCP message sent by the last media server After the notification message of the sequence number of the text, send the transmission instruction of the media content and the transmission parameters of the media content to the next media server, and the transmission parameters include the TCP connection between the control server and the user terminal source address, destination address, and the sequence number of the last TCP packet carried in the notification message.

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