CN109246486B - Method and device for framing - Google Patents
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- CN109246486B CN109246486B CN201811204718.7A CN201811204718A CN109246486B CN 109246486 B CN109246486 B CN 109246486B CN 201811204718 A CN201811204718 A CN 201811204718A CN 109246486 B CN109246486 B CN 109246486B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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Abstract
The embodiment of the invention provides a framing method and a framing device, which are applied to a video network. The method comprises the following steps: the video networking terminal receives a video data packet which is issued by the video networking server based on a video networking protocol, wherein the video data packet comprises a packet sequence number and a frame sequence number; the video networking terminal utilizes the video data packet to frame according to the packet sequence number and the frame sequence number; if the video network terminal judges that the video frame of the current framing is lost, determining whether to discard the video frame; and if the video networking terminal determines to discard, deleting the video data packet belonging to the video frame. The processing method in the embodiment of the invention is more accurate, avoids discarding the video frames without real packet loss, reduces the number of the discarded video frames, does not cause the phenomenon of screen splash when playing the video data, and improves the user experience.
Description
Technical Field
The present invention relates to the field of video networking technologies, and in particular, to a framing method and a framing apparatus.
Background
With the rapid development of network technologies, bidirectional communications such as video conferences, video teaching, video phones, and the like are widely popularized in the aspects of life, work, learning, and the like of users. In the communication process, video data can be mutually transmitted between the terminals of the two communication parties. However, during the transmission of video data, packet loss may occur due to various reasons, such as the terminal device itself, the network connection, and so on.
In the prior art, for the packet loss phenomenon, if a certain video frame is found to be lost, all data packets belonging to the video frame are discarded, and the video frame is not framed. However, this processing method is not accurate, and it may be that the video frames are discarded according to the packet loss without actually losing the packet, and if a large number of video frames are discarded, the phenomenon of screen splash and the like occurs when the video data is played, which reduces the user experience.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are proposed to provide a framing method and a corresponding framing apparatus that overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention discloses a framing method, which is applied to a video network, where the video network includes a video network terminal and a video network server, and the method includes:
the video networking terminal receives a video data packet issued by the video networking server based on a video networking protocol; the video data packet comprises a packet sequence number and a frame sequence number;
the video networking terminal utilizes the video data packet to frame according to the packet sequence number and the frame sequence number;
if the video networking terminal judges that the video frame currently undergoing framing has lost the packet, determining whether to discard the video frame;
and if the video networking terminal determines to discard, deleting the video data packet belonging to the video frame.
Preferably, the step of determining whether to discard the video frame comprises: the video networking terminal judges whether framing of the video frames is successful or not before the video data packets which are continuously received reach the set number; and when the judgment result is unsuccessful, the video network terminal determines to discard the video frame.
Preferably, before the step that the video networking terminal determines whether framing of the video frames is successful before the video data packets continuously received reach the set number, the method further includes: the video network terminal judges whether the video frame is an I frame; when the video network terminal judges that the video frame is not the I frame, the video network terminal determines to discard the video frame; and when the video network terminal judges that the video data packets are I frames, the video network terminal executes the step that whether the framing of the video frames is successful or not before the video data packets which are continuously received reach the set number.
Preferably, after the step of deleting all video data packets belonging to the video frame if the video networking terminal determines to discard, the method further includes: and if the video network terminal judges that the video frame is the I frame, deleting the video data packet of the P frame between the video frame and the next I frame.
Preferably, the step of the video networking terminal receiving the video data packet sent by the video networking server based on the video networking protocol includes: and the video networking terminal receives a video data packet which is issued by the video networking server based on a video networking protocol according to a downlink communication link configured for the video networking terminal.
On the other hand, the embodiment of the invention also discloses a framing device, which is applied to the video network, wherein the video network comprises a video network terminal and a video network server, and the video network terminal comprises:
the receiving module is used for receiving the video data packet sent by the video networking server based on the video networking protocol; the video data packet comprises a packet sequence number and a frame sequence number;
the framing module is used for framing by utilizing the video data packet according to the packet sequence number and the frame sequence number;
the determining module is used for determining whether to discard the video frame if the video frame which is currently subjected to framing is determined to be lost;
a first deleting module, configured to delete the video data packet belonging to the video frame if the determining module determines to discard the video data packet.
Preferably, the determining module comprises: the first judging unit is used for judging whether framing of the video frames is successful or not before the number of video data packets which are continuously received reaches the set number; and the first determining unit is used for determining to discard the video frame when the judgment result of the first judging unit is unsuccessful.
Preferably, before the step that the video networking terminal determines whether framing of the video frames is successful before the video data packets continuously received reach the set number, the determining module further includes: the second judging unit is used for judging whether the video frame is an I frame; a second determining unit, configured to determine to discard the video frame when the second determination result is that the video frame is not an I frame; the first determining unit is specifically configured to determine, when the second determining unit determines that the video data packet is an I frame, whether framing of the video frame is successful before the number of video data packets that are continuously received reaches a set number.
Preferably, the video network terminal further comprises: and the second deleting module is used for deleting the video data packet of the P frame between the video frame and the next I frame if the video frame is judged to be the I frame.
Preferably, the receiving module is specifically configured to receive a video data packet that is sent by the video networking server based on a video networking protocol according to a downlink communication link configured for the video networking terminal.
In the embodiment of the invention, a video networking terminal receives a video networking server and transmits a video data packet based on a video networking protocol; the video networking terminal performs framing by using the video data packet according to the packet sequence number and the frame sequence number; if the video network terminal judges that the video frame of the current framing is lost, determining whether to discard the video frame; and if the video networking terminal determines to discard, deleting the video data packets belonging to the video frame. Therefore, in the embodiment of the present invention, when a video frame is lost, the video frame is not directly discarded, but it is further determined whether the video frame really needs to be discarded. Therefore, the processing mode is more accurate, the phenomenon that the video frames which do not really lose packets are discarded is avoided, the number of the discarded video frames is reduced, the phenomenon of screen splash when the video data are played is avoided, and the user experience is improved.
Drawings
FIG. 1 is a schematic networking diagram of a video network of the present invention;
FIG. 2 is a schematic diagram of a hardware architecture of a node server according to the present invention;
fig. 3 is a schematic diagram of a hardware structure of an access switch of the present invention;
fig. 4 is a schematic diagram of a hardware structure of an ethernet protocol conversion gateway according to the present invention;
FIG. 5 is a flowchart illustrating steps of a method for framing according to an embodiment of the present invention;
fig. 6 is a block diagram of a framing apparatus according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The video networking is an important milestone for network development, is a real-time network, can realize high-definition video real-time transmission, and pushes a plurality of internet applications to high-definition video, and high-definition faces each other.
The video networking adopts a real-time high-definition video exchange technology, can integrate required services such as dozens of services of video, voice, pictures, characters, communication, data and the like on a system platform on a network platform, such as high-definition video conference, video monitoring, intelligent monitoring analysis, emergency command, digital broadcast television, delayed television, network teaching, live broadcast, VOD on demand, television mail, Personal Video Recorder (PVR), intranet (self-office) channels, intelligent video broadcast control, information distribution and the like, and realizes high-definition quality video broadcast through a television or a computer.
To better understand the embodiments of the present invention, the following description refers to the internet of view:
some of the technologies applied in the video networking are as follows:
network Technology (Network Technology)
Network technology innovation in video networking has improved over traditional Ethernet (Ethernet) to face the potentially enormous video traffic on the network. Unlike pure network Packet Switching (Packet Switching) or network Circuit Switching (Circuit Switching), the Packet Switching is adopted by the technology of the video networking to meet the Streaming requirement. The video networking technology has the advantages of flexibility, simplicity and low price of packet switching, and simultaneously has the quality and safety guarantee of circuit switching, thereby realizing the seamless connection of the whole network switching type virtual circuit and the data format.
Switching Technology (Switching Technology)
The video network adopts two advantages of asynchronism and packet switching of the Ethernet, eliminates the defects of the Ethernet on the premise of full compatibility, has end-to-end seamless connection of the whole network, is directly communicated with a user terminal, and directly bears an IP data packet. The user data does not require any format conversion across the entire network. The video networking is a higher-level form of the Ethernet, is a real-time exchange platform, can realize the real-time transmission of the whole-network large-scale high-definition video which cannot be realized by the existing Internet, and pushes a plurality of network video applications to high-definition and unification.
Server Technology (Server Technology)
The server technology on the video networking and unified video platform is different from the traditional server, the streaming media transmission of the video networking and unified video platform is established on the basis of connection orientation, the data processing capacity of the video networking and unified video platform is independent of flow and communication time, and a single network layer can contain signaling and data transmission. For voice and video services, the complexity of video networking and unified video platform streaming media processing is much simpler than that of data processing, and the efficiency is greatly improved by more than one hundred times compared with that of a traditional server.
Storage Technology (Storage Technology)
The super-high speed storage technology of the unified video platform adopts the most advanced real-time operating system in order to adapt to the media content with super-large capacity and super-large flow, the program information in the server instruction is mapped to the specific hard disk space, the media content is not passed through the server any more, and is directly sent to the user terminal instantly, and the general waiting time of the user is less than 0.2 second. The optimized sector distribution greatly reduces the mechanical motion of the magnetic head track seeking of the hard disk, the resource consumption only accounts for 20% of that of the IP internet of the same grade, but concurrent flow which is 3 times larger than that of the traditional hard disk array is generated, and the comprehensive efficiency is improved by more than 10 times.
Network Security Technology (Network Security Technology)
The structural design of the video network completely eliminates the network security problem troubling the internet structurally by the modes of independent service permission control each time, complete isolation of equipment and user data and the like, generally does not need antivirus programs and firewalls, avoids the attack of hackers and viruses, and provides a structural carefree security network for users.
Service Innovation Technology (Service Innovation Technology)
The unified video platform integrates services and transmission, and is not only automatically connected once whether a single user, a private network user or a network aggregate. The user terminal, the set-top box or the PC are directly connected to the unified video platform to obtain various multimedia video services in various forms. The unified video platform adopts a menu type configuration table mode to replace the traditional complex application programming, can realize complex application by using very few codes, and realizes infinite new service innovation.
Networking of the video network is as follows:
the video network is a centralized control network structure, and the network can be a tree network, a star network, a ring network and the like, but on the basis of the centralized control node, the whole network is controlled by the centralized control node in the network.
As shown in fig. 1, the video network is divided into an access network and a metropolitan network.
The devices of the access network part can be mainly classified into 3 types: node server, access switch, terminal (including various set-top boxes, coding boards, memories, etc.). The node server is connected to an access switch, which may be connected to a plurality of terminals and may be connected to an ethernet network.
The node server is a node which plays a centralized control function in the access network and can control the access switch and the terminal. The node server can be directly connected with the access switch or directly connected with the terminal.
Similarly, devices of the metropolitan network portion may also be classified into 3 types: a metropolitan area server, a node switch and a node server. The metro server is connected to a node switch, which may be connected to a plurality of node servers.
The node server is a node server of the access network part, namely the node server belongs to both the access network part and the metropolitan area network part.
The metropolitan area server is a node which plays a centralized control function in the metropolitan area network and can control a node switch and a node server. The metropolitan area server can be directly connected with the node switch or directly connected with the node server.
Therefore, the whole video network is a network structure with layered centralized control, and the network controlled by the node server and the metropolitan area server can be in various structures such as tree, star and ring.
The access network part can form a unified video platform (the part in the dotted circle), and a plurality of unified video platforms can form a video network; each unified video platform may be interconnected via metropolitan area and wide area video networking.
1. Video networking device classification
1.1 devices in the video network of the embodiment of the present invention can be mainly classified into 3 types: servers, switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.). The video network as a whole can be divided into a metropolitan area network (or national network, global network, etc.) and an access network.
1.2 wherein the devices of the access network part can be mainly classified into 3 types: node servers, access switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.).
The specific hardware structure of each access network device is as follows:
a node server:
as shown in fig. 2, the system mainly includes a network interface module 201, a switching engine module 202, a CPU module 203, and a disk array module 204;
the network interface module 201, the CPU module 203, and the disk array module 204 all enter the switching engine module 202; the switching engine module 202 performs an operation of looking up the address table 205 on the incoming packet, thereby obtaining the direction information of the packet; and stores the packet in a queue of the corresponding packet buffer 206 based on the packet's steering information; if the queue of the packet buffer 206 is nearly full, it is discarded; the switching engine module 202 polls all packet buffer queues for forwarding if the following conditions are met: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero. The disk array module 204 mainly implements control over the hard disk, including initialization, read-write, and other operations on the hard disk; the CPU module 203 is mainly responsible for protocol processing with an access switch and a terminal (not shown in the figure), configuring an address table 205 (including a downlink protocol packet address table, an uplink protocol packet address table, and a data packet address table), and configuring the disk array module 204.
The access switch:
as shown in fig. 3, the network interface module mainly includes a network interface module (a downlink network interface module 301 and an uplink network interface module 302), a switching engine module 303 and a CPU module 304;
wherein, the packet (uplink data) coming from the downlink network interface module 301 enters the packet detection module 305; the packet detection module 305 detects whether the Destination Address (DA), the Source Address (SA), the packet type, and the packet length of the packet meet the requirements, and if so, allocates a corresponding stream identifier (stream-id) and enters the switching engine module 303, otherwise, discards the stream identifier; the packet (downstream data) coming from the upstream network interface module 302 enters the switching engine module 303; the data packet coming from the CPU module 204 enters the switching engine module 303; the switching engine module 303 performs an operation of looking up the address table 306 on the incoming packet, thereby obtaining the direction information of the packet; if the packet entering the switching engine module 303 is from the downstream network interface to the upstream network interface, the packet is stored in the queue of the corresponding packet buffer 307 in association with the stream-id; if the queue of the packet buffer 307 is nearly full, it is discarded; if the packet entering the switching engine module 303 is not from the downlink network interface to the uplink network interface, the data packet is stored in the queue of the corresponding packet buffer 307 according to the guiding information of the packet; if the queue of the packet buffer 307 is nearly full, it is discarded.
The switching engine module 303 polls all packet buffer queues, which in this embodiment of the present invention is divided into two cases:
if the queue is from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queued packet counter is greater than zero; 3) obtaining a token generated by a code rate control module;
if the queue is not from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero.
The rate control module 208 is configured by the CPU module 204, and generates tokens for packet buffer queues from all downstream network interfaces to upstream network interfaces at programmable intervals to control the rate of upstream forwarding.
The CPU module 304 is mainly responsible for protocol processing with the node server, configuration of the address table 306, and configuration of the code rate control module 308.
Ethernet protocol conversion gateway：
As shown in fig. 4, the apparatus mainly includes a network interface module (a downlink network interface module 401 and an uplink network interface module 402), a switching engine module 403, a CPU module 404, a packet detection module 405, a rate control module 408, an address table 406, a packet buffer 407, a MAC adding module 409, and a MAC deleting module 410.
Wherein, the data packet coming from the downlink network interface module 401 enters the packet detection module 405; the packet detection module 405 detects whether the ethernet MAC DA, the ethernet MAC SA, the ethernet length or frame type, the video network destination address DA, the video network source address SA, the video network packet type, and the packet length of the packet meet the requirements, and if so, allocates a corresponding stream identifier (stream-id); then, the MAC deletion module 410 subtracts MAC DA, MAC SA, length or frame type (2byte) and enters the corresponding receiving buffer, otherwise, discards it;
the downlink network interface module 401 detects the sending buffer of the port, and if there is a packet, obtains the ethernet MAC DA of the corresponding terminal according to the video networking destination address DA of the packet, adds the ethernet MAC DA of the terminal, the MAC SA of the ethernet coordination gateway, and the ethernet length or frame type, and sends the packet.
The other modules in the ethernet protocol gateway function similarly to the access switch.
A terminal:
the system mainly comprises a network interface module, a service processing module and a CPU module; for example, the set-top box mainly comprises a network interface module, a video and audio coding and decoding engine module and a CPU module; the coding board mainly comprises a network interface module, a video and audio coding engine module and a CPU module; the memory mainly comprises a network interface module, a CPU module and a disk array module.
1.3 devices of the metropolitan area network part can be mainly classified into 2 types: node server, node exchanger, metropolitan area server. The node switch mainly comprises a network interface module, a switching engine module and a CPU module; the metropolitan area server mainly comprises a network interface module, a switching engine module and a CPU module.
2. Video networking packet definition
2.1 Access network packet definition
The data packet of the access network mainly comprises the following parts: destination Address (DA), Source Address (SA), reserved bytes, payload (pdu), CRC.
As shown in the following table, the data packet of the access network mainly includes the following parts:
| DA | SA | Reserved | Payload | CRC |
wherein:
the Destination Address (DA) is composed of 8 bytes (byte), the first byte represents the type of the data packet (such as various protocol packets, multicast data packets, unicast data packets, etc.), there are 256 possibilities at most, the second byte to the sixth byte are metropolitan area network addresses, and the seventh byte and the eighth byte are access network addresses;
the Source Address (SA) is also composed of 8 bytes (byte), defined as the same as the Destination Address (DA);
the reserved byte consists of 2 bytes;
the payload part has different lengths according to different types of data packets, and is 64 bytes if the data packet is a variety of protocol packets, and is 32+1024 or 1056 bytes if the data packet is a unicast data packet, of course, the length is not limited to the above 2 types;
the CRC consists of 4 bytes and is calculated in accordance with the standard ethernet CRC algorithm.
2.2 metropolitan area network packet definition
The topology of a metropolitan area network is a graph and there may be 2, or even more than 2, connections between two devices, i.e., there may be more than 2 connections between a node switch and a node server, a node switch and a node switch, and a node switch and a node server. However, the metro network address of the metro network device is unique, and in order to accurately describe the connection relationship between the metro network devices, parameters are introduced in the embodiment of the present invention: a label to uniquely describe a metropolitan area network device.
In this specification, the definition of the Label is similar to that of the Label of MPLS (Multi-Protocol Label Switch), and assuming that there are two connections between the device a and the device B, there are 2 labels for the packet from the device a to the device B, and 2 labels for the packet from the device B to the device a. The label is classified into an incoming label and an outgoing label, and assuming that the label (incoming label) of the packet entering the device a is 0x0000, the label (outgoing label) of the packet leaving the device a may become 0x 0001. The network access process of the metro network is a network access process under centralized control, that is, address allocation and label allocation of the metro network are both dominated by the metro server, and the node switch and the node server are both passively executed, which is different from label allocation of MPLS, and label allocation of MPLS is a result of mutual negotiation between the switch and the server.
As shown in the following table, the data packet of the metro network mainly includes the following parts:
| DA | SA | Reserved | label (R) | Payload | CRC |
Namely Destination Address (DA), Source Address (SA), Reserved byte (Reserved), tag, payload (pdu), CRC. The format of the tag may be defined by reference to the following: the tag is 32 bits with the upper 16 bits reserved and only the lower 16 bits used, and its position is between the reserved bytes and payload of the packet.
Example one
The framing method of the embodiment of the invention can be applied to the video network. The video network terminal and the video network server (specifically, the node server) may be included in the video network, and one video network server may access a plurality of video network terminals. The framing method of the embodiment of the invention can be particularly applied to video networking terminals. The video network terminal is a video network service landing device, an actual participant or a server of the video network service, and the video network terminal can be various set top boxes, streaming media gateways, storage gateways, media synthesizers, code boards and the like. The terminal of the video network needs to be registered on the video network server to carry out normal service.
Referring to fig. 5, a flowchart illustrating steps of a framing method according to a first embodiment of the present invention is shown.
The framing method of the embodiment of the invention can comprise the following steps:
The framing method of the embodiment of the invention can be applied to the communication process based on the video network, such as video conference, video teaching, video telephone, broadcasting live broadcast, watching live broadcast and the like.
For example, taking a video conference as an example, in a communication process of the video conference, a video networking terminal (such as a conference speaking party) of a sender may encapsulate collected video data into a video data packet based on a video networking protocol, and send the video data packet to a video networking server through the video networking. The video data packet may include information of a video networking terminal of the sender and information of a video networking terminal of the receiver, and the video networking server may issue the video data packet to the video networking terminal of the receiver (such as a conference participant) through the video networking based on a video networking protocol.
The embodiment of the invention mainly describes the framing process of the video network terminal of the receiver after receiving the video data packet sent by the video network server. Therefore, the video network terminal related in the embodiment of the invention is a video network terminal of a receiving party.
In a preferred embodiment, the video networking server may issue, based on a video networking protocol, a video data packet to the video networking terminal according to a downlink communication link configured for the video networking terminal (i.e., the video networking terminal of the receiving party), where the video data packet may be specifically a video data packet sent by the video networking terminal of the sending party to the video networking server.
In practical applications, the video network is a network with a centralized control function, and includes a master control server and a lower level network device, where the lower level network device includes a terminal, and one of the core concepts of the video network is to configure a table for a downlink communication link of a current service by notifying a switching device by the master control server, and then transmit a data packet based on the configured table.
Namely, the communication method in the video network includes:
and the master control server configures the downlink communication link of the current service.
And transmitting the data packet of the current service sent by the source terminal (such as the video network terminal of the sender) to the target terminal (such as the video network terminal of the receiver) according to the downlink communication link.
In the embodiment of the present invention, configuring the downlink communication link of the current service includes: and informing the switching equipment related to the downlink communication link of the current service to allocate the table.
Further, transmitting according to the downlink communication link includes: the configured table is consulted, and the switching equipment transmits the received data packet through the corresponding port.
In particular implementations, the services include unicast communication services and multicast communication services. Namely, whether multicast communication or unicast communication, the core concept of the table matching-table can be adopted to realize communication in the video network.
As mentioned above, the video network includes an access network portion, in which the master server is a node server and the lower-level network devices include an access switch and a terminal.
For the unicast communication service in the access network, the step of configuring the downlink communication link of the current service by the master server may include the following steps:
and a substep S11, the main control server obtains the downlink communication link information of the current service according to the service request protocol packet initiated by the source terminal, wherein the downlink communication link information includes the downlink communication port information of the main control server and the access switch participating in the current service.
In the substep S12, the main control server sets a downlink port to which a packet of the current service is directed in a packet address table inside the main control server according to the downlink communication port information of the main control server; and sending a port configuration command to the corresponding access switch according to the downlink communication port information of the access switch.
In sub-step S13, the access switch sets the downstream port to which the packet of the current service is directed in its internal packet address table according to the port configuration command.
For a multicast communication service (e.g., video conference) in the access network, the step of the master server obtaining downlink information of the current service may include the following sub-steps:
in sub-step S21, the main control server obtains a service request protocol packet initiated by the target terminal and applying for the multicast communication service, where the service request protocol packet includes service type information, service content information, and an access network address of the target terminal.
Wherein, the service content information includes a service number.
And a substep S22, the main control server extracts the access network address of the source terminal in a preset content-address mapping table according to the service number.
In the substep of S23, the main control server obtains the multicast address corresponding to the source terminal and distributes the multicast address to the target terminal; and acquiring the communication link information of the current multicast service according to the service type information and the access network addresses of the source terminal and the target terminal.
And 502, framing by using the video data packet by the video networking terminal according to the packet sequence number and the frame sequence number.
The video network terminal receives video data packets sent by the video network server one by one, each video data packet may include a packet sequence number and a frame sequence number, and one video frame may include a plurality of video data packets, for example, 10 or 20 video data packets, and so on. The video networking terminal can utilize the video data packet to frame according to the packet sequence number and the frame sequence number of the video data packet. In the framing process for a certain video frame, the video data packets are arranged according to the sequence of the packet sequence numbers of the video data packets belonging to the video frame.
For example, if the frame number of the 1 st video data packet received by the video network terminal is 1 and the packet number is 1, the video data packet is placed at the position of the 1 st data packet in the video frame with the frame number of 1; if the frame number of the received 2 nd video data packet is 1 and the packet number is 3, placing the video data packet at the position behind the video data packet with the frame number of 1 in the video frame with the frame number of 1; if the frame number of the received 3 rd video data packet is 1 and the packet number is 2, placing the video data packet at the position after the video data packet with the frame number of 1 and before the video data packet with the packet number of 3 in the video frame with the frame number of 1; if the frame number of the received 4 th video data packet is 1 and the packet number is 5, placing the video data packet at the position behind the video data packet with the frame number of 3 in the video frame with the frame number of 1; if the frame number of the received 5 th video data packet is 1 and the packet number is 6, placing the video data packet at the position behind the video data packet with the frame number of 5 in the video frame with the frame number of 1; and if the frame number of the received 6 th video data packet is 1 and the packet number is 7, placing the video data packet at the position behind the video data packet with the frame number of 6 in the video frame with the frame number of 1. And by analogy, the framing process of the video frame with the frame number of 1 is carried out.
In step 503, if the video network terminal determines that the video frame currently undergoing framing has lost, it determines whether to discard the video frame.
And the video networking terminal can also judge whether the video frame currently undergoing framing has lost the packet or not in the process of framing by utilizing the video data packet according to the packet sequence number and the frame sequence number.
In a specific implementation manner, the following manner may be adopted for determining whether the video frame is lost: after detecting that a video frame which is currently subjected to framing appears in a video frame which is temporarily lost, the video networking terminal judges whether to receive the temporarily lost video data packet before the video data packet which is continuously received reaches a set number threshold; if not, determining that the video frame has lost the packet; if the video frame is received, it is determined that the video frame has not lost a packet, and the video frame may be out of order. The set number threshold here may be set to any applicable value according to practical situations, for example, may be set to 2, 3, 4, and so on, and the embodiment of the present invention is not limited thereto.
For example, the set number threshold may be set to be 2, and according to the above example, the frame number of the received 2 nd video data packet is 1, and the packet number is 3; the frame number of the received 2 nd video data packet is 1, and the packet number is 3; at this time, it can be detected that the video frame with the frame number of 1 has a video data packet that is temporarily lost, that is, the video data packet with the packet number of 2, and the frame number of the 3 rd video data packet that is continuously received is 1 and the packet number is 2, so it can be known that the video data packet with the frame number of 1 and the packet number of 2 has only a disorder, and is not a packet loss. The frame number of the received 2 nd video data packet is 1, and the packet number is 3; the frame number of the received 3 rd video data packet is 1, and the packet number is 2; the frame number of the received 4 th video data packet is 1, and the packet number is 5; at this time, it can be detected that the video frame with the frame number of 1 has a video data packet which is temporarily lost, that is, the video data packet with the packet number of 4, while the frame number of the continuously received 5 th video data packet is 1, and the packet number is 6; the frame number of the 6 th video data packet is 1, the packet number is 7, and the video data packet with the frame number of 1 and the packet number of 4 has not been received, so that it can be known that the video data packet with the frame number of 1 and the packet number of 4 has lost a packet, rather than has been out of order.
If the video network terminal judges that the video frame currently undergoing framing is lost, the video frame is not directly discarded, but whether the video frame really needs to be discarded can be further determined.
In a preferred embodiment, the step of determining whether to drop the video frame may comprise: the video networking terminal judges whether framing of the video frames is successful or not before the video data packets which are continuously received reach the set number; when the judgment result is unsuccessful, the video networking terminal determines to discard the video frame; and when the judgment result is successful, determining to reserve the video frame. The set number here may be set to any suitable value according to practical situations, for example, may be set to 40, 50, 60, and so on, and the embodiment of the present invention is not limited thereto.
Wherein, judging whether the video frame is successfully framed may be: and judging whether all video data packets included in the video frame are placed in sequence or not to form a complete video frame. For example, if a video frame with a frame number of 1 includes 20 video data packets, then if 20 video data packets with a frame number of 1, a packet number of 1, and a frame number of 1, and a packet number of 20 are all placed in sequence to form a complete video frame, the framing of the video frame with a frame number of 1 is successful.
In this way, the video networking terminal can continue to receive the video data packets after determining that the video frame currently undergoing framing has lost packets, and if the video frame cannot be made complete while continuing to receive the set number of video data packets, it is determined that the video frame can be discarded indeed.
In another preferred embodiment, the step of determining whether to drop the video frame may comprise: the video network terminal judges whether the video frame is an I frame; when the judgment result is that the frame is not the I frame, determining to discard the video frame; when the judgment result is that the frame is the I frame, the video networking terminal can further judge whether the framing of the video frame is successful before the video data packets which are continuously received reach the set number; when the judgment result is unsuccessful, determining to discard the video frame; and when the judgment result is successful, determining to reserve the video frame.
The video data packet further includes a frame type identifier, and the frame type identifier may be an I frame, a P frame, or a B frame. Determining whether the video frame is an I frame may be: and judging whether the video frame is an I frame or not according to the frame type identifier of the video data packet included in the video frame.
In this way, the video network terminal firstly judges the type of the video frame, if the video frame is not an I frame, it can be considered that the influence generated after discarding the video frame is not too large, and thus the video frame can be determined to be discarded; if the video frame is an I-frame, it may be considered that the influence generated after discarding the video frame may be large, and therefore the video frame may not be discarded temporarily, and the above-described determination process may be further performed to further determine whether to actually discard the video frame.
And step 504, if the video network terminal determines to discard, deleting the video data packet belonging to the video frame.
If it is determined that the video frame is discarded, the video networking terminal may delete all video packets belonging to the video frame.
Preferably, in the embodiment of the present invention, after deleting the video data packet belonging to the video frame, the video network terminal may further perform a subsequent processing procedure according to the type of the food. For example, the video network terminal determines whether the video frame is an I frame; if the video frame is judged not to be the I frame, no processing is carried out; if the video frame is determined to be an I-frame, deleting a video data packet belonging to a P-frame between the video frame and the next I-frame, that is, deleting a Group of Pictures (GOP) in which the video frame is located, where the GOP represents all P-frames between two I-frames.
If the dropped video frame is an I frame, the video network terminal may continue to receive video data packets at a later time, and if the video frame to which the video data packet belongs is determined to be a P frame, delete the video data packets belonging to the P frame.
For a complete video frame which is not discarded and successfully framed, the video network terminal can decode and play the video frame, so as to realize the transmission of video data between the video network terminals.
In the embodiment of the invention, when the video frame is lost, the video frame is not directly discarded, but whether the video frame really needs to be discarded is further determined. Therefore, the processing mode is more accurate, the phenomenon that the video frames which do not really lose packets are discarded is avoided, the number of the discarded video frames is reduced, the phenomenon of screen splash when the video data are played is avoided, and the user experience is improved.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Example two
Referring to fig. 6, a block diagram of a framing apparatus according to a second embodiment of the present invention is shown. The framing device provided by the embodiment of the invention can be applied to the video network, and the video network comprises a video network terminal and a video network server.
The framing device of the embodiment of the invention can be particularly applied to a video networking terminal, and can comprise the following modules positioned in the video networking terminal:
the video networking terminal includes:
a receiving module 601, configured to receive a video data packet sent by the video networking server based on a video networking protocol; the video data packet comprises a packet sequence number and a frame sequence number;
a framing module 602, configured to perform framing by using the video data packet according to the packet sequence number and the frame sequence number;
a determining module 603, configured to determine whether to discard a video frame if it is determined that the video frame currently being framed loses packet;
a first deleting module 604, configured to delete the video data packet belonging to the video frame if the determining module determines to discard the video data packet.
In a preferred embodiment, the determining module comprises: the first judging unit is used for judging whether framing of the video frames is successful or not before the number of video data packets which are continuously received reaches the set number; and the first determining unit is used for determining to discard the video frame when the judgment result of the first judging unit is unsuccessful.
In a preferred embodiment, before the step that the video network terminal determines whether the framing of the video frames is successful before the video data packets continuously received reach the set number, the determining module further includes: the second judging unit is used for judging whether the video frame is an I frame; a second determining unit, configured to determine to discard the video frame when the second determination result is that the video frame is not an I frame; the first determining unit is specifically configured to determine, when the second determining unit determines that the video data packet is an I frame, whether framing of the video frame is successful before the number of video data packets that are continuously received reaches a set number.
In a preferred embodiment, the video network terminal further includes: and the second deleting module is used for deleting the video data packet of the P frame between the video frame and the next I frame if the video frame is judged to be the I frame.
In a preferred embodiment, the receiving module is specifically configured to receive a video data packet that is sent by the video networking server based on a video networking protocol according to a downlink communication link configured for the video networking terminal.
In the embodiment of the invention, when the video frame is lost, the video frame is not directly discarded, but whether the video frame really needs to be discarded is further determined. Therefore, the processing mode is more accurate, the phenomenon that the video frames which do not really lose packets are discarded is avoided, the number of the discarded video frames is reduced, the phenomenon of screen splash when the video data are played is avoided, and the user experience is improved.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above detailed description of a framing method and a framing apparatus provided by the present invention, and the specific examples applied herein have been provided to explain the principles and embodiments of the present invention, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A framing method is applied to an Internet of view, wherein the Internet of view comprises an Internet of view terminal and an Internet of view server, and the method comprises the following steps:
the video networking terminal receives a video data packet issued by the video networking server based on a video networking protocol; the video data packet comprises a packet sequence number and a frame sequence number;
the video networking terminal utilizes the video data packet to frame according to the packet sequence number and the frame sequence number;
after detecting that a video frame which is currently subjected to framing appears in a video data packet which is temporarily lost, the video networking terminal judges whether the video data packet which is temporarily lost is received before the video data packet which is continuously received reaches a set number threshold;
if the video data packet which is temporarily lost is not received, determining that the video frame has lost the packet;
if the video networking terminal judges that the video frame currently undergoing framing has lost the packet, determining whether to discard the video frame;
if the video networking terminal determines to discard, deleting the video data packet belonging to the video frame;
wherein the step of determining whether to drop the video frame comprises:
judging whether the video frame is an I frame;
if the judgment result is not the I frame, the video networking terminal determines to discard the video frame;
if the video frame is the I frame, the video networking terminal further judges whether framing of the video frame is successful before the video data packets continuously received reach the set number; when the judgment result is unsuccessful, determining to discard the video frame; and when the judgment result is successful, determining to reserve the video frame.
2. The method according to claim 1, further comprising, after the step of deleting all video packets belonging to the video frame if the video networking terminal determines to discard, the step of:
and if the video network terminal judges that the video frame is the I frame, deleting the video data packet of the P frame between the video frame and the next I frame.
3. The method according to claim 1, wherein the step of receiving the video data packet sent by the video networking server based on the video networking protocol by the video networking terminal comprises:
and the video networking terminal receives a video data packet which is issued by the video networking server based on a video networking protocol according to a downlink communication link configured for the video networking terminal.
4. A framing device, wherein the device is applied to a video network, the video network comprises a video network terminal and a video network server, the video network terminal comprises:
the receiving module is used for receiving the video data packet sent by the video networking server based on the video networking protocol; the video data packet comprises a packet sequence number and a frame sequence number;
the framing module is used for framing by utilizing the video data packet according to the packet sequence number and the frame sequence number;
the device comprises a determining module, a judging module and a sending module, wherein the determining module is used for judging whether the video data packets which are temporarily lost are received before the video data packets which are continuously received reach a set number threshold value after the video frames which are currently subjected to framing are detected to have the temporarily lost video data packets; if the video data packet which is temporarily lost is not received, determining that the video frame has lost the packet;
the determining module is further used for determining whether to discard the video frame if the video frame currently undergoing framing is determined to be lost;
a first deleting module, configured to delete the video data packet belonging to the video frame if the determining module determines to discard the video data packet;
wherein the determining module further comprises:
the second judging unit is used for judging whether the video frame is an I frame;
a second determining unit, configured to determine to discard the video frame when the second determination result is that the video frame is not an I frame;
a first judging unit, configured to, when the second judging unit judges that the video data packet is an I frame, judge whether framing of the video frame is successful before the video data packet that is continuously received reaches a set number;
a first determining unit, configured to determine to discard the video frame when the determination result of the first determining unit is unsuccessful; and when the judgment result is successful, determining to reserve the video frame.
5. The apparatus of claim 4, wherein the video networking terminal further comprises:
and the second deleting module is used for deleting the video data packet of the P frame between the video frame and the next I frame if the video frame is judged to be the I frame.
6. The apparatus of claim 4,
the receiving module is specifically configured to receive a video data packet that is sent by the video networking server based on a video networking protocol according to a downlink communication link configured for the video networking terminal.
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| CN109996127A (en) * | 2019-03-20 | 2019-07-09 | 视联动力信息技术股份有限公司 | Data transmission method and device based on view networking |
| CN111343501A (en) * | 2020-03-06 | 2020-06-26 | 随锐科技集团股份有限公司 | Packet loss detection method and system, and computer readable storage medium |
| CN111601178B (en) * | 2020-05-26 | 2022-09-23 | 维沃移动通信有限公司 | Video data processing method and device and electronic equipment |
| CN112399253A (en) * | 2020-11-30 | 2021-02-23 | 武汉噢易云计算股份有限公司 | Method and system for reducing USB BULK image equipment redirection flow |
| CN113099272A (en) * | 2021-04-12 | 2021-07-09 | 上海商汤智能科技有限公司 | Video processing method and device, electronic equipment and storage medium |
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