WO2023000133A1 - Système de diffusion continue en direct sur internet - Google Patents

Système de diffusion continue en direct sur internet Download PDF

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Publication number
WO2023000133A1
WO2023000133A1 PCT/CN2021/107081 CN2021107081W WO2023000133A1 WO 2023000133 A1 WO2023000133 A1 WO 2023000133A1 CN 2021107081 W CN2021107081 W CN 2021107081W WO 2023000133 A1 WO2023000133 A1 WO 2023000133A1
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WO
WIPO (PCT)
Prior art keywords
audio
domain name
video encoder
internet
live broadcast
Prior art date
Application number
PCT/CN2021/107081
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English (en)
Chinese (zh)
Inventor
吴嵩
贾正东
陆品李
Original Assignee
深圳爱特天翔科技有限公司
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Application filed by 深圳爱特天翔科技有限公司 filed Critical 深圳爱特天翔科技有限公司
Priority to PCT/CN2021/107081 priority Critical patent/WO2023000133A1/fr
Publication of WO2023000133A1 publication Critical patent/WO2023000133A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • 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

Definitions

  • This application relates to the technical field of network audio and video transmission, in particular to an Internet live broadcast system.
  • the most commonly used method is to realize instant live broadcast of audio and video through various live broadcast platforms.
  • live broadcast software in general devices (such as mobile phones, tablet computers, etc.)
  • the platform's streaming server The live broadcast receiver uses the supporting software of the live broadcast platform to connect to the streaming media server of the live broadcast platform, obtains the data stream and decodes and displays it.
  • the transfer of audio and video data through the streaming media server of the third-party live broadcast platform significantly reduces the real-time performance of audio and video transmission, and may also cause data security issues.
  • the present application provides an Internet live broadcast system, which provides a low-latency live broadcast of high-definition video through the Internet conveniently, and the security of the live video data is guaranteed to a certain extent.
  • the first technical solution provided by this application is to provide an Internet live broadcast system, which includes:
  • a mobile hotspot, the audio and video encoder is connected to the Internet through the mobile hotspot;
  • a router, the audio and video decoder is connected to the Internet through the router;
  • the audio and video encoder is used to transmit live data to the audio and video decoder through the Internet.
  • the Internet live broadcast system also includes a dynamic domain name server
  • the audio and video encoder and the audio and video decoder are respectively connected to the dynamic domain name server, and the dynamic domain name server is used to provide the audio and video encoder and/or the audio and video decoder with a dynamic domain name service.
  • the audio and video encoder includes a dynamic domain name module, and the dynamic domain name module is used to send a request instruction to the dynamic domain name server, so that the dynamic domain name server sends the audio and video encoder information according to the request instruction
  • the external network IP address is mapped to a fixed domain name address.
  • the dynamic domain name module is used to read the domain name configuration file of the audio and video encoder, and send the domain name configuration file and the external network IP address of the audio and video encoder to the dynamic domain name server, to request the dynamic domain name server to bind the external network IP address with the domain name configuration file.
  • the dynamic domain name module is further configured to update the domain name configuration file when domain name configuration update information is received.
  • the dynamic domain name module is also used to detect whether the IP address of the external network changes within a preset time after sending the request instruction to the dynamic domain name server, and if not, send the request command to the dynamic domain name server again. Request instructions.
  • the audio-video encoder includes a port program module, and the port program module is used for mapping the local port number of the audio-video encoder to the external network port number of the router.
  • the port program module is used to read the port configuration file of the audio and video encoder, and send the port configuration file to the router to request the router to update the port mapping;
  • the port configuration file includes the local port number of the audio and video encoder, and the external network port number of the router.
  • the audio and video encoder also includes a live transmission protocol program module, and the live transmission protocol program module is used to establish a data connection between the audio and video encoder and the audio and video decoder in the Internet live broadcast system, and to transmit the live broadcast data.
  • the Internet live broadcast system also includes a live program source device
  • the live program source device is connected to the audio and video encoder, and the live program source device is used to provide the audio and video encoder with the live data.
  • the live program source device includes a high-definition multimedia interface
  • the audio-video encoder includes a male interface
  • the male interface is used to connect with the high-definition multimedia interface, so that the audio-video encoder and the Connect to the source device of the live program.
  • the Internet live broadcast system includes: an audio and video encoder; a mobile hotspot, the audio and video encoder connects to the Internet through a mobile hotspot; an audio and video decoder; a router, and the audio and video decoder connects to the Internet through a router; among them, the audio and video encoder, It is used to transmit live data to audio and video decoders through the Internet.
  • the Internet live broadcast system of this application directly realizes point-to-point live broadcast of audio and video encoders and audio and video decoders directly through the Internet.
  • the live broadcast process does not rely on a third-party live broadcast platform, and the Internet live broadcast system is simple and efficient.
  • Fig. 1 is a structural representation of an embodiment of the Internet live broadcast system provided by the application;
  • Fig. 2 is a schematic structural diagram of another embodiment of the Internet live broadcast system provided by the present application.
  • FIG. 3 is a schematic structural diagram of an embodiment of an audio and video encoder provided by the present application.
  • Fig. 4 is a schematic structural diagram of an embodiment of an audio-video decoder provided by the application.
  • Fig. 5 is a schematic flow chart of the operation of the DDNS program module provided by the present application.
  • FIG. 6 is a schematic flowchart of the operation of the UPnP program module provided by the present application.
  • FIG. 1 is a schematic structural diagram of an embodiment of an Internet live broadcast system provided by the present application.
  • the Internet live broadcast system 100 provided by this application at least includes: an audio and video encoder 11 , a mobile hotspot 12 , an audio and video decoder 13 , a router 14 and the Internet 15 .
  • the audio and video encoder 11 can be connected to the Internet 15 through the mobile hotspot 12
  • the audio and video decoder 13 can be connected to the Internet 15 through the router 14 .
  • the audio and video encoder 11 obtains the live output video signal, and compresses and encodes the live output video signal into live data, so as to directly transmit the live data to the audio and video decoder 13 through the Internet 15 end-to-end; wherein, the audio and video decoder 13 receives The live data is decoded and output.
  • the audio and video decoder 13 can be connected to a display (not shown in the figure), so as to output and display the live data through the display.
  • FIG. 2 is a schematic structural diagram of another embodiment of the Internet live broadcast system provided by the present application.
  • the Internet live broadcast system 100 includes an audio and video encoder 11 , a mobile hotspot 12 , an audio and video decoder 13 , a router 14 and the Internet 15 , and also includes a dynamic domain name server 16 and a live program source device 17 .
  • the live program source device 17 includes but is not limited to: a high-definition camera, or an HDMI signal source such as a computer or a set-top box. Taking high-definition cameras as an example, high-definition cameras are used for shooting live video, that is, as providers of live audio and video sources.
  • the audio and video encoder 11 can be used for collecting audio and video sources, encoding, compressing and sending live data.
  • FIG. 3 is a schematic structural diagram of an embodiment of the audio and video encoder provided in this application.
  • the audio and video encoder 11 has a small appearance, and its volume can be set to 30mmx70mmx13mm.
  • the audio and video encoder 11 includes an HDMI input port 101 , an LED two-color indicator light 102 , an analog audio input port 103 , a USB port 104 and an encoder multifunctional key 105 .
  • the HDMI input port 101 is used to connect live video sources, such as high-definition cameras, notebook computers, etc., and can also supply power to the audio and video encoder 11 at the same time.
  • LED two-color indicator light 102 is used to indicate the current device status of the audio and video encoder 11, and the USB port 104 can also be used for auxiliary power supply.
  • the audio and video encoder 11 is equipped with an HDMI Type-A male head, that is, the HDMI input port 101, which can be directly inserted into the HDMI socket of the high-definition camera without an HDMI cable.
  • the audio and video encoder 11 can even directly use the HDMI interface to supply power.
  • the audio and video encoder 11 can be integrated with the high-definition camera without connecting any cables, so that the encoder will not shoot the user's video during the live broadcast. operations have any effect.
  • the HDMI input port 101 of the encoder can be directly inserted into the HDMI socket of the high-definition camera for image acquisition without an HDMI cable.
  • the initiator of the live broadcast request is the audio and video encoder 11
  • the LED indicator light 102 will indicate the current live broadcast status in real time (the green light flashes quickly to indicate that the live broadcast is in progress, and the green light is always on to indicate that the live broadcast is stopped).
  • the audio and video encoder 11 establishes a wireless connection with the mobile hotspot 12 via WiFi to join the Internet 15 . Long press the encoder button 105 to allow the audio and video encoder 11 to enter the setting mode.
  • the audio and video encoder 11 in the setting mode is used as a WI-FI AP device to provide web services and built-in web pages.
  • the third party has a web browser function device, Such as computers, mobile phones, and tablet computers, join this WI-FI network, and use a web browser to open the setting page to modify the working parameters or behavior of the encoder.
  • the audio and video decoder 13 can be used to receive compressed audio and video live data, decode and output to an audio and video terminal, such as a display screen for playback.
  • an audio and video terminal such as a display screen for playback.
  • FIG. 4 is a schematic structural diagram of an embodiment of the audio and video decoder provided in this application.
  • the audio and video decoder 13 includes a decoder multi-function button 201, a first LED indicator light 202, a second LED indicator light 203, an SD card slot 204, an analog audio output port 205, an HDMI output port 206, Gigabit Ethernet port 207 and USB port 208 .
  • the USB port 208 can also be used to supply power to the device.
  • the HDMI output port 206 of the decoder can be connected to a monitor through an HDMI cable to output live video.
  • the initiator of the live broadcast request is the audio and video decoder 13
  • the LED indicator light 201 will indicate the current live broadcast status in real time (the green light flashes quickly to indicate that the live broadcast is in progress, and the green light is always on to indicate that the live broadcast is stopped).
  • the audio and video decoder 13 forms an internal local area network through a wired connection with the router 14, and can access the Internet 15 through the WAN port of the router.
  • Audio-video decoder 13 provides web service and built-in setting webpage
  • the third party has the computer equipment of web browser function can access the local area network that is made up of audio-video decoder 13 and router 14, and uses web browser to open this setting webpage to revise The working parameters or behavior of the audio and video decoder 13.
  • the audio and video decoder 13 has the functions of recording and storing audio and video streams, and playback on demand. To enable this function, an SD card needs to be inserted into the SD card slot 204 of the decoder, and the recording switch should be turned on in the setting web page.
  • the mobile hotspot 12 is mainly used to provide an Internet access point for the audio and video encoder 11 , and the audio and video encoder 11 can establish a connection with the mobile hotspot 12 through a built-in WiFi module to access the Internet 15 .
  • the router 14 is used to bridge the Internet 15 and the local area network where the audio and video decoder 13 is located.
  • the dynamic domain name server 16 in the embodiment of the present application is a third-party dynamic domain name server (DDNS) set on the remote Internet.
  • DDNS third-party dynamic domain name server
  • the dynamic domain name server 16 is used to provide the dynamic domain name service for the audio/video encoder 11 and/or the audio/video decoder 13 .
  • the audio and video encoder 11 and the audio and video decoder 13 in the embodiment of the present application implement an Internet end-to-end data transmission method through DDNS+UPnP+SRT. Specifically, run the DDNS program module (i.e. the dynamic domain name module), the UPnP program module (i.e. the port program module) and the SRT program module (i.e. the live transmission protocol program module) on the audio/video encoder 11 and the audio/video decoder 13 .
  • DDNS program module i.e. the dynamic domain name module
  • the UPnP program module i.e. the port program module
  • the SRT program module i.e. the live transmission protocol program module
  • the DDNS program module maps the unfixed public network IP of the audio and video encoder 11 or the audio and video decoder 13, that is, the external network IP address, to a fixed domain name address by requesting a remote DDNS server.
  • the audio and video encoder 11 and the audio and video decoder 13 are accessed through the domain name address.
  • FIG. 5 is a schematic diagram of the operation flow of the DDNS program module provided by this application.
  • Step 401 Read the domain name configuration file to obtain the DDNS information set by the user.
  • DDNS information such as: DDNS service provider name, registered domain name account number and password, etc.
  • Step 402 Send the current external network IP address and domain name account to the corresponding DDNS server, requesting that the domain name be bound to the current external network IP address.
  • Step 403 Read the feedback information from the DDNS server, and update the status display on the web page of the decoder.
  • Step 404 Detect whether domain name configuration update information is received.
  • the DDNS configuration such as: modifying the DDNS service provider, modifying the domain name
  • Step 405 Updating the domain name configuration file.
  • Step 406 Detect whether the external network IP address of the encoder changes.
  • step 407 Check whether the external network IP address of the encoder has changed. If there is a change, execute step 407 immediately, and then execute step 402 to refresh the domain name binding; if there is no change, execute step 408.
  • Step 407 Clear the timing counter.
  • Step 408 Timing for 1 second, adding 1 to the timing counter.
  • Step 409 Detect whether the value of the timer counter reaches a preset value.
  • step 402 will also be executed to refresh the domain name binding.
  • the purpose of such intermittent refreshing is to solve the problem of original domain name binding failure or invalidation caused by network or DDNS server abnormality, so as to improve system redundancy.
  • the UPnP program module maps the local port number of the audio-video encoder 11 and/or audio-video decoder 13 connected to the router 14 to the router 14 external network port numbers by sending a UPnP port mapping request to the router 14, so as to realize Intranet penetration (that is, access the service port of the internal network device through the external network port number of the router on the public network).
  • FIG. 6 is a schematic flow chart of the operation of the UPnP program module provided in this application.
  • Step 501 Read the UPnP configuration file.
  • UPnP port mapping information set by the user through the UPnP configuration file (ie: codec local port number, router external network port number).
  • Step 502 Send UPnP port mapping information to the router, requesting the router to update the port mapping.
  • Step 503 Detect whether port mapping update information is received.
  • step 504 Check whether the signaling sent by the webpage is received in a loop to determine whether the user has modified the UPnP port mapping configuration, if the user has modified the port mapping configuration, then execute step 504, otherwise, execute step 505.
  • Step 504 Update the port mapping configuration file.
  • Step 505 Detect whether the intranet IP address changes.
  • both the audio and video encoder 11 and the audio and video decoder 13 in the embodiment of the present application support the SRT data transmission protocol.
  • the SRT program module of the embodiment of the present application is used to establish a data connection between the encoder and the decoder of the Internet live broadcast system 100 and transmit data.
  • only the DDNS and UPnP settings of the SRT Listener need to be effective, so that the SRT Caller, as the initiator of the live session, can initiate a live request to the SRT Listener through the domain name and port number.
  • SRT Listener can be audio-video encoder 11, also can be audio-video decoder 13.
  • the initiator of the live broadcast request may also be the audio and video encoder 11, or may be the audio and video decoder 13.
  • the Internet live broadcast system 100 of the embodiment of the present application adopts the SRT (Secure Reliable Transport) protocol in the video transmission link.
  • the SRT protocol is an open source Internet transmission protocol based on the UDP protocol, and has three advantages of safety, reliability, and low delay.
  • SRT provides AES encryption to ensure end-to-end video transmission security.
  • SRT uses a very good packet loss retransmission mechanism to ensure the reliability and real-time performance of video transmission in complex network environments.
  • the SRT protocol has three modes (Caller, Listener, Rendezvous). During the SRT transmission process, the Caller and the Listener must appear in pairs. That is to say, if one of the two devices in the SRT communication is a Caller, the other must be a Listener. ,vice versa.
  • the Caller is the initiator of the SRT streaming session, and the Listener will listen to the SRT streaming on a specific port and wait for the streaming session to start.
  • the Caller device When initiating a session, the Caller device must know the IP address of the Listener and the listening port number.
  • the Rendezvous mode is specially used for occasions where intranet penetration is required, that is, the two devices communicating with the SRT are located in separate local area networks, and the two local area networks are isolated from the public network by a router.
  • the Rendezvous mode does not require any port forwarding settings on the router to establish an SRT connection between the two devices, but the prerequisite is that the router does not change the port number of the packet header when forwarding the internal network data packet to the public network.
  • the router will modify the port number of the packet header when forwarding the packet. That is to say, in most cases, the prerequisites for the application of the Rendezvous mode are not met.
  • the present invention does not use the Rendezvous mode for intranet penetration, but uses codecs as Caller or Listener respectively, and utilizes UPnP (Universal Plug and Play) port mapping for intranet penetration.
  • UPnP Universal Plug and Play
  • the audio and video encoder 11 acts as a Listener
  • the audio and video decoder 13 acts as a Caller
  • the public network IP of the audio and video encoder 11 may change every time the connection between the audio and video encoder 11 and the mobile hotspot 12 is established, that is, the public network IP address of the audio and video encoder 11 is not fixed. It is very inconvenient to access an unfixed public IP address.
  • the dynamic domain name server DDNS is used in the embodiment of this application to map the unfixed public IP address to a fixed domain name address.
  • the port number listened to by the audio/video encoder 11 is the local port number, which is invisible to the remote audio/video decoder 13 .
  • this example uses UPnP (Universal Plug and Play) to map the listening port of the audio and video encoder 11 to the same port number located at the mobile hotspot 12 .
  • UPnP Universal Plug and Play
  • the live broadcast user registers a dynamic domain name (assuming the registered dynamic domain name is encoder.ddns.net) on the website of a third-party DDNS provider (such as: Oray, No-ip, Dyndns, etc.).
  • a third-party DDNS provider such as: Oray, No-ip, Dyndns, etc.
  • the audio and video encoder 11 connects to the hotspot 12 through WiFi (assuming that the intranet IP of the audio and video encoder 11 is 192.168.1.10 and the public network IP is 139.207.170.100 after the connection is successful).
  • the audio and video encoder 11 sends the public network IP address 139.207.170.100 and the dynamic domain name encoder.ddns.net to the corresponding DDNS server according to a certain protocol format, thereby completing the binding of the public network IP and the dynamic domain name.
  • the audio and video encoder 11 starts the SRT process and opens a listening port 8540 .
  • the audio and video encoder 11 sends a UPnP message to request the mobile hotspot 12 to map its local port 8540 to the external network port 8540 of the mobile hotspot 12 .
  • the local port number and the external network port number can be different; the mobile hotspot 12 must support the UPnP protocol and the UPnP function has been turned on
  • the audio and video decoder 13 sends an SRT stream session request to the address srt://encoder.ddns.net:8540, and sets the audio and video decoder 13 as the receiver of the SRT stream.
  • the mobile hotspot 12 forwards the received SRT session request to the audio and video encoder 11 .
  • the audio-video encoder 11 After receiving the SRT session request, the audio-video encoder 11 sends a response to the audio-video decoder 13, and the SRT session enters the protocol handshake stage.
  • the audio and video encoder 11 acts as a Caller
  • the audio and video decoder 13 acts as a Listener
  • the mobile hotspot does not support UPnP.
  • the SRT session request initiated by the audio and video decoder 13 will not be able to penetrate the mobile hotspot 12 and reach the port 8540 of the audio and video encoder 11.
  • most routers all support UPnP, so for overcoming the limitation of the first kind of connection mode, audio and video encoder 11 can be used as the initiator of SRT session, and audio and video decoder 13 is as the listening party of SRT session, router 14 is used to implement UPnP port mapping so as to achieve in-pass access to the audio and video decoder 13.
  • the live broadcast user registers a dynamic domain name for the decoder on the website of a third-party DDNS provider (such as Oray, No-ip, Dyndns, etc.) (assuming that the registered dynamic domain name is decoder.ddns.net).
  • a third-party DDNS provider such as Oray, No-ip, Dyndns, etc.
  • the audio-video decoder 13 establishes a wired network connection with the router 14 (assuming that the intranet IP of the audio-video decoder 13 is 192.168.2.10 after the connection is successful, and the public network IP is 138.208.171.100)
  • the audio and video decoder 13 sends the public network IP address 138.208.171.100 and the dynamic domain name decoder.ddns.net to the corresponding DDNS server according to a certain protocol format, thereby completing the binding of the public network IP and the dynamic domain name.
  • the audio and video decoder 13 starts the SRT process and opens a listening port 8541 .
  • the audio-video decoder 13 sends a UPnP message to request the router 14 to map the port 8541 of its own machine to the external network port 8541 of the router. (Note: The local port number and the external network port number can be different; the UPnP function of the router must be turned on)
  • the audio and video encoder 11 connects to the hotspot 12 through WiFi.
  • the audio and video encoder 11 sends an SRT stream session request to the address srt://decoder.ddns.net:8541, and sets the audio and video encoder 11 as the sender of the SRT stream.
  • the router 14 forwards the received SRT session request to the audio and video decoder 13 .
  • the audio and video decoder 13 After receiving the SRT session request, the audio and video decoder 13 sends a response to the audio and video encoder 11, and the SRT session enters the protocol handshake stage.
  • the SRT session After the SRT protocol handshake is completed, the SRT session officially enters the audio and video stream transmission stage, and the data is transmitted from the audio and video encoder 11 to the audio and video decoder 13 .
  • the point-to-point live broadcast is formed by the audio and video encoder 11 and the audio and video decoder 13.
  • the live broadcast process does not depend on a third-party live broadcast platform.
  • the Internet live broadcast system 100 is simple and efficient; It is simple and convenient to set up and set up.
  • the disclosed methods and devices may be implemented in other ways.
  • the device implementations described above are only illustrative.
  • the division of modules or units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • a unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

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Abstract

La présente invention concerne un système de diffusion continue en direct sur Internet, le système de diffusion continue en direct sur Internet comportant: un codeur audio et vidéo; un point mobile d'accès sans fil, le codeur audio et vidéo étant connecté à Internet au moyen du point mobile d'accès sans fil; un décodeur audio et vidéo; et un routeur, le décodeur audio et vidéo étant connecté à Internet au moyen du routeur; le codeur audio et vidéo étant utilisé pour, au moyen d'Internet, transmettre des données de diffusion continue en direct au décodeur audio et vidéo. Le système de diffusion continue en direct sur Internet selon la présente invention, au moyen d'Internet, réalise directement une diffusion directe continue en direct de point à point entre un codeur audio et vidéo et un décodeur audio et vidéo, et le processus de diffusion continue en direct ne dépend pas d'une plate-forme tierce de diffusion continue en direct, ce qui rend simple et efficient le système de diffusion continue en direct sur Internet.
PCT/CN2021/107081 2021-07-19 2021-07-19 Système de diffusion continue en direct sur internet WO2023000133A1 (fr)

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