CN111756583A - Dual-code-stream video switching method and video switching system - Google Patents
Dual-code-stream video switching method and video switching system Download PDFInfo
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- CN111756583A CN111756583A CN202010648568.XA CN202010648568A CN111756583A CN 111756583 A CN111756583 A CN 111756583A CN 202010648568 A CN202010648568 A CN 202010648568A CN 111756583 A CN111756583 A CN 111756583A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The invention provides a dual-code-stream video switching method and a video switching system, and relates to the technical field of communication. The double-code-stream video switching method provided by the invention comprises the following steps: receiving two paths of video stream data; identifying two paths of video stream data, and determining an output path corresponding to each video stream data, wherein the output path comprises a main link and an auxiliary link, the video stream data corresponding to the main link is defined as first video stream data, and the video stream data corresponding to the auxiliary link is defined as second video stream data; transmitting the first video stream data to the primary link, forwarding the second video stream data to the secondary link; when the main link or the auxiliary link fails, determining a failed output path; switching to the normal output path. The technical scheme of the invention can realize quick automatic switching when any link of the dual code streams fails.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a dual stream video switching method and a video switching system.
Background
With the widespread application of distributed processors in the field of display control, a video transmission mode mainly based on single code stream and low image quality cannot well meet the target requirements of users, so that a transmission mode with double code streams, high image quality and low delay is generated at present, and the distributed processors have a multi-network-port hot backup function. The function can simultaneously transmit multi-channel signal sources on two links of the same equipment, and when a certain link of one equipment fails, the other link can be automatically switched to, so that the continuous playing of videos is realized.
The realization method is mainly characterized in that network switching chips are simply added on a signal source and a display side, two paths of coded network data are respectively output to two convergence switches through the coding side network switching chips, then are respectively distributed to a decoding side network switching chip through the convergence switches, and network data interaction is carried out through the decoding side network switching chip, so that video coding and decoding are realized.
However, the inventor found that when two links of the encoding side network switch chip respectively transmit data to two aggregation switches to transmit the data to two links of the decoding side network switch chip, a closed loop is formed between the two network switch chips and the two aggregation switches, and because the same IP address exists in each link, when the aggregation switches start the links with the same IP, the time delay is large, and real-time high-dynamic correspondence cannot be achieved during switching.
Disclosure of Invention
The invention provides a dual-stream video switching method and a video switching system, which can realize quick and automatic switching when any link of dual streams fails.
In a first aspect, the present invention provides a method for switching dual stream video, which adopts the following technical scheme:
the dual-code stream video switching method comprises the following steps:
receiving two paths of video stream data;
identifying two paths of video stream data, and determining an output path corresponding to each video stream data, wherein the output path comprises a main link and an auxiliary link, the video stream data corresponding to the main link is defined as first video stream data, and the video stream data corresponding to the auxiliary link is defined as second video stream data;
transmitting the first video stream data to the primary link, forwarding the second video stream data to the secondary link;
when the main link or the auxiliary link fails, determining a failed output path;
switching to the normal output path.
Optionally, the data formats and data protocols of the two paths of video stream data are different; the data protocols of the main link and the auxiliary link are different and are respectively matched with one path of video stream data.
Further, the data protocol of the main link is a UDP data packet encapsulating an own protocol; the data protocol of the auxiliary link is standard UDP packets.
Optionally, the receiving two paths of video stream data includes: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts.
Further, the identifying two paths of video stream data and determining the output path corresponding to each of the video stream data includes: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link, if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
Optionally, when the primary link or the secondary link fails, determining the failed output path includes: and when the main link or the auxiliary link fails, determining a failed output path according to the condition of the first video stream data or the second video stream data.
In a second aspect, the present invention provides a dual stream video switching system, which adopts the following technical scheme:
the dual stream video switching system comprises:
the data receiving module is used for receiving two paths of video stream data;
the path determining module is used for identifying two paths of video stream data and determining an output path corresponding to each path of the video stream data, wherein the output path comprises a main link and an auxiliary link, the video stream data corresponding to the main link is defined as first video stream data, and the video stream data corresponding to the auxiliary link is defined as second video stream data;
the data transmission module is used for transmitting the first video stream data to the main link and forwarding the second video stream data to the auxiliary link;
the fault judgment module is used for determining a faulted output path when the main link or the auxiliary link has faults;
and the path switching module is used for switching to a normal output path.
Optionally, the data receiving module is specifically configured to: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts.
Further, the path determination module is specifically configured to: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link, if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
Optionally, the fault determining module is specifically configured to: and when the main link or the auxiliary link fails, determining a failed output path according to the condition of the first video stream data or the second video stream data.
The invention provides a dual-stream video switching method and a video switching system, wherein the dual-stream video switching method comprises the following steps: receiving two paths of video stream data; identifying two paths of video stream data, determining output paths corresponding to the video stream data respectively, wherein the output paths comprise a main link and an auxiliary link, and defining the video stream data corresponding to the main link as first video stream data and the video stream data corresponding to the auxiliary link as second video stream data; transmitting the first video stream data to the main link, and forwarding the second video stream data to the auxiliary link; when the main link or the auxiliary link fails, determining a failed output path; and switching to a normal output path to output the video. The method comprises the steps of identifying two paths of video stream data, determining output paths corresponding to the video stream data respectively, and determining the output paths with faults when a main link or an auxiliary link has faults.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a dual stream video switching method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a normal output process of a dual-stream video according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dual stream video switching system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the technical features in the embodiments of the present invention may be combined with each other without conflict.
The dual-stream video switching method and the dual-stream video switching system provided by the embodiment of the invention are suitable for a dual-stream distributed processor, and the dual-stream distributed processor comprises but is not limited to a convergence switch, a main link chip, a main link network port, an auxiliary link chip and a video interface.
An embodiment of the present invention provides a dual stream video switching method, and specifically, as shown in fig. 1 and fig. 2, fig. 1 is a flowchart of the dual stream video switching method provided in the embodiment of the present invention, and fig. 2 is a schematic diagram of a normal output process of a dual stream video provided in the embodiment of the present invention, where the dual stream video switching method includes:
step S1, receiving two paths of video stream data;
the above receiving process may be performed by the function p _ bufreev _ ETH _ Data (u32p _ Len). It is necessary to ensure that the main link port and the auxiliary link port of the dual-stream distributed processor are inserted into the external network cable before the operation, so as to ensure that the network connection and the convergence switch are in a normal connection state and ensure that the input source link at the encoding side is smooth. Step S1 may be performed by the main link chip.
Optionally, the two paths of video stream data in the network have different data formats and data protocols.
Illustratively, the specific process of receiving two paths of video stream data includes: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts. For example, the packet length is split by a function memcpy and custom arrays Rcv _ Buf _ Head and Rcv _ Buf _ Data.
Step S2, identifying two paths of video stream data, and determining output paths corresponding to the video stream data respectively;
the output path comprises a main link and an auxiliary link, video stream data corresponding to the main link is defined as first video stream data, and video stream data corresponding to the auxiliary link is defined as second video stream data.
The above identification process may be performed by the system functions strcat and memcpy.
Optionally, the two paths of video stream data have different data formats and data protocols, and the main link and the auxiliary link have different data protocols and are respectively matched with one path of video stream data. For example, the data protocol of the main link is a UDP packet encapsulating the own protocol, and is used as a main basis for private decoding and determining whether to receive the packet; the data protocol of the auxiliary link is a standard UDP data packet, which contains the protocols with the functions of identification, handshake communication and the like required by the auxiliary link chip at the opposite end, and the data packet is judged and identified by the main link chip at the main link side and is determined to be forwarded or not.
For example, after the data packet of the two paths of video stream data is split into the packet header and the packet part in step S1, the specific process of identifying the two paths of video stream data and determining the output paths corresponding to the video stream data in step S2 includes: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link (for example, matching the analyzed packet header information with the formulated private protocol content), if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
Step S2 may be executed by the main link chip, and after the main link network interface receives the two paths of video stream data, because the main link data protocol is different from the auxiliary link data protocol, the main link chip may perform data flow direction judgment according to the data protocol that can be recognized by itself, and perform data packet header judgment and analysis through an internal program of the main link chip, thereby determining the output path.
Step S3, transmitting the first video stream data to the main link, and forwarding the second video stream data to the auxiliary link;
illustratively, the first video stream Data is transferred to the primary Link by a function u32Link _ Main _ Data (u32p _ Data, u32Len), and the second video stream Data is forwarded to the secondary Link by a function u32Link _ AUX _ Data (u32p _ Data, u32 Len).
It should be noted that "transmission" in the embodiment of the present invention may be an operation within the same hardware, or may be an operation between different hardware, which is determined according to actual situations. For example, since step S2 is performed by the main link chip, "transfer" in step S3 occurs inside the main link chip.
When the main link is normal, the main link chip can directly perform data decoding processing on the first video stream data, and the first video stream data is decoded into a video and output to the video interface. When the internal program of the main link chip recognizes that the second video stream data is not the data required by the main link chip in step S2, the second video stream data is forwarded to the auxiliary port of the auxiliary link and output to the auxiliary link chip of the auxiliary link through the auxiliary port. The auxiliary link chip can perform handshake identification with the opposite terminal and request stream information, and when the stream information is received, data decoding processing is performed on second video stream data, and the second video stream data is decoded into a video and output to the video interface.
Step S4, when the main link or the auxiliary link fails, determining the failed output path;
optionally, when the primary link or the secondary link fails, the specific process of determining the failed output path includes: and when the main link or the auxiliary link fails, determining the output path with the failure according to the condition of the first video stream data or the second video stream data. Illustratively, when a failure occurs in the primary Link or the secondary Link, the failed output path is determined by obtaining a function Eth _ Link _ ithandler (netif).
Step S4 may be executed by the main link chip, and when any one of the video streams fails or the bit information is incorrect, the main link chip may determine the output path where the failure occurs according to the traffic and/or protocol information of the current video stream data (the first video stream data or the second video stream data). Exemplarily, if the current is the first video stream data required by the main link chip, but the main link chip does not receive the required data protocol within 5s, determining that the main link is failed; and if the second video stream data required by the auxiliary link chip is currently, but the required data protocol is not received within 5s, determining that the auxiliary link is failed.
And step S5, switching to a normal output path.
Illustratively, if the primary link is determined to be failed in step S4, the video output is switched to the secondary link, and if the secondary link is determined to be failed in step S4, the video output is switched to the primary link, thereby implementing a seamless switching operation. Step S5 may be performed by the main link chip. The switching of the normal output path can be realized by the function u32Switch _ LINK (u8LINK _ Name).
In addition, the dual stream video switching method in the embodiment of the present invention may further include: and reporting the switching state to a server at the same time of or after switching to a normal output path, for example, through a function UDP _ data send (str _ board _ msg, strlen (char) str _ board _ msg)), and updating the video state to another path of decoded output.
The double-code-stream video switching method provided by the invention has the advantages that two paths of video stream data are identified, the time for determining the output paths corresponding to the video stream data is extremely short, when the main link or the auxiliary link fails, the time for determining the failed output path is also extremely short, the normal output path can be quickly switched to for video output, and the above processes can be realized without any peripheral equipment or personnel operation.
In addition, compared with the prior art, the dual-code stream video switching method in the embodiment of the invention is established on the basis of all controls, the main link chip collects and monitors the link information of the main link and the auxiliary link in real time, and the link layer is adopted for forwarding, so that the link state information can be updated and reported and the faulty link can be bypassed in a very short time according to the data packet condition and the data flow. The method adopts a mode of software detection and hardware switching, depends on a switching mechanism in the device, has low requirement on external network connection, and simultaneously realizes automatic switching in real time when a fault occurs, can be realized without any peripheral equipment and personnel operation, and meets the application requirement.
In addition, an embodiment of the present invention further provides a dual stream video switching system, and specifically, as shown in fig. 3, fig. 3 is a schematic diagram of the dual stream video switching system provided in the embodiment of the present invention, where the dual stream video switching system includes:
the data receiving module 1 is used for receiving two paths of video stream data;
the path determining module 2 is configured to identify two paths of video stream data, determine an output path corresponding to each video stream data, where the output path includes a main link and an auxiliary link, and define video stream data corresponding to the main link as first video stream data and video stream data corresponding to the auxiliary link as second video stream data;
the data transmission module 3 is used for transmitting the first video stream data to the main link and forwarding the second video stream data to the auxiliary link;
the failure judgment module 4 is used for determining a failed output path when the main link or the auxiliary link fails;
and the path switching module 5 is used for switching to a normal output path.
Optionally, the data receiving module 1, the path determining module 2, the data transmitting module 3, the failure determining module 4, and the path switching module 5 are all integrated inside a main link chip.
Optionally, the data receiving module 1 is specifically configured to: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts.
Further, the path determining module 2 is specifically configured to: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link, if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
Optionally, the fault determining module 4 is specifically configured to: and when the main link or the auxiliary link fails, determining the output path with the failure according to the condition of the first video stream data or the second video stream data.
It should be noted that, the details related to the dual stream video switching method in the embodiment of the present invention are all applicable to the dual stream video switching system, and are not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A dual stream video switching method is characterized by comprising the following steps:
receiving two paths of video stream data;
identifying two paths of video stream data, and determining an output path corresponding to each video stream data, wherein the output path comprises a main link and an auxiliary link, the video stream data corresponding to the main link is defined as first video stream data, and the video stream data corresponding to the auxiliary link is defined as second video stream data;
transmitting the first video stream data to the primary link, forwarding the second video stream data to the secondary link;
when the main link or the auxiliary link fails, determining a failed output path;
switching to the normal output path.
2. The dual stream video switching method according to claim 1, wherein the data formats and data protocols of the two paths of video stream data are different; the data protocols of the main link and the auxiliary link are different and are respectively matched with one path of video stream data.
3. The dual stream video switching method according to claim 2, wherein the data protocol of the main link is UDP packets encapsulating an own protocol; the data protocol of the auxiliary link is standard UDP packets.
4. The dual stream video switching method according to claim 2, wherein said receiving two paths of video stream data comprises: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts.
5. The dual stream video switching method of claim 4, wherein the identifying two streams of video stream data and determining the output path corresponding to each of the video stream data comprises: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link, if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
6. The dual stream video switching method of claim 1, wherein the determining the failed output path when the main link or the auxiliary link fails comprises: and when the main link or the auxiliary link fails, determining a failed output path according to the condition of the first video stream data or the second video stream data.
7. A dual stream video switching system, comprising:
the data receiving module is used for receiving two paths of video stream data;
the path determining module is used for identifying two paths of video stream data and determining an output path corresponding to each path of the video stream data, wherein the output path comprises a main link and an auxiliary link, the video stream data corresponding to the main link is defined as first video stream data, and the video stream data corresponding to the auxiliary link is defined as second video stream data;
the data transmission module is used for transmitting the first video stream data to the main link and forwarding the second video stream data to the auxiliary link;
the fault judgment module is used for determining a faulted output path when the main link or the auxiliary link has faults;
and the path switching module is used for switching to a normal output path.
8. The dual stream video switching system according to claim 7, wherein the data receiving module is specifically configured to: and receiving the two paths of video stream data, splitting the two paths of video stream data according to the packet length of the two paths of video stream data, and splitting the packets of the two paths of video stream data into packet headers and message parts.
9. The dual stream video switching system of claim 8, wherein the path determining module is specifically configured to: analyzing the packet header of the video stream data, matching the analysis result with the data protocol of the main link, if the matching is successful, determining the output path corresponding to the video stream data as the main link, and if the matching is failed, determining the output path corresponding to the video stream data as the auxiliary link.
10. The dual stream video switching system according to claim 7, wherein the failure determination module is specifically configured to: and when the main link or the auxiliary link fails, determining a failed output path according to the condition of the first video stream data or the second video stream data.
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