CN110798650B - Multi-system media stream transmission control method and device based on RTP - Google Patents
Multi-system media stream transmission control method and device based on RTP Download PDFInfo
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- CN110798650B CN110798650B CN201910905344.XA CN201910905344A CN110798650B CN 110798650 B CN110798650 B CN 110798650B CN 201910905344 A CN201910905344 A CN 201910905344A CN 110798650 B CN110798650 B CN 110798650B
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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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- 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
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
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Abstract
The invention provides a multi-system media stream transmission control method based on RTP, which comprises a video conference server and a main control system, and the method comprises the following steps: step 10, the master control system acquires switching information, informs a first system receiving a media stream, and stops processing the media stream; step 20, the master control system sends the switching information and the video conference server information to a second system; step 30, the second system sends an RTP message to the video conference server according to the video conference server information; and step 40, the video conference server receives and analyzes the RTP message, and then sends the media stream to a second system. The invention relates to the technical field of network communication, and discloses a method and a device for realizing the different-screen presentation of a video at a designated server side on the basis of not changing the original system architecture, without influencing the system performance, and ensuring the forwarding efficiency.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a method and an apparatus for controlling transmission of a multi-system media stream based on RTP.
Background
RTP (Real-Time Transport Protocol) is a Real-Time network Transport Protocol established for multimedia data streams and published by IETF as RFC3550 (old version RFC 1889). RTP provides end-to-end delivery services for data with real-time characteristics, such as interactive audio and video. These services include payload type identification, sequence numbering, time stamping, and delivery monitoring. RTP itself only guarantees the transmission of real-time data and does not provide a reliable transport mechanism for the in-sequence delivery of data packets, nor flow control or congestion control.
In a large-scale video conference terminal, because a plurality of video output systems exist, a video stream of a video server side is transmitted to a main control system of the terminal only through RTP. When a user switches a multi-screen layout, the server-side video needs to be supported to be presented on the output screen of the non-master control system. In the prior art, the cross-system RTP stream mutual transmission technology is realized by SIP/H.323, RTSP and the like.
However, the existing technology has at least the following disadvantages that the SIP/h.323 technology needs to set corresponding clients at both ends, and can transmit after SDP negotiation, so that the implementation complexity and difficulty are high, and the establishment of a server is needed to complete the cooperation, which has high requirements for resources such as a CPU and a memory on the device; in the RTSP mode, an RTSP service needs to be implemented in the main control, and the request end can acquire an RTP stream through standard RTSP interaction, but the main control performance is consumed and the forwarding efficiency cannot be guaranteed.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a multi-system media stream transmission control method based on RTP, which realizes the different-screen presentation of the server-side video without changing the original system architecture.
One of the technical problems solved by the invention is realized as follows: a multi-system media stream transmission control method based on RTP comprises a video conference server and a main control system, and the method comprises the following steps:
step 10, the master control system acquires switching information, informs a first system receiving a media stream, and stops processing the media stream;
step 20, the master control system sends the switching information and the video conference server information to a second system;
step 30, the second system sends an RTP message to the video conference server according to the video conference server information;
and step 40, the video conference server receives and analyzes the RTP message, and then sends the media stream to a second system.
Further, the system also comprises at least one non-master control system, and when the first system is a master control system, the second system is a non-master control system; and when the first system is a non-master control system, the second system is a master control system or other non-master control systems.
Further, the handover information includes system layout information and target handover subsystem information, and the step 20 further specifically includes:
and the master control system obtains a second system according to the system layout information and the target switching subsystem information, and sends the switching information and the video conference server information to the second system.
Further, the step 40 is further specifically:
and step 40, the video conference server receives and analyzes the RTP message, performs RTP address learning, and sends the media stream to a second system according to the learning result.
The second technical problem to be solved by the present invention is to provide a multi-system media stream transmission control device based on RTP, which realizes the different-screen presentation of the server-side video without changing the original system architecture.
The second technical problem solved by the invention is realized as follows: a multi-system media stream transmission control device based on RTP comprises a video conference server and a main control system, and is characterized in that: the device comprises a switching information acquisition module, a switching information sending module, a detection message sending module and a media stream sending module;
a switching information acquisition module, configured to acquire switching information by the master control system, notify a first system that receives a media stream, and stop processing the media stream;
the switching information sending module is used for sending the switching information and the video conference server information to a second system by the master control system;
the message sending module is used for sending an RTP message to the video conference server by the second system according to the video conference server information;
and the media stream sending module is used for sending the media stream to the second system by the video conference server according to the RTP message.
Further, when the first system is a master control system, the second system is a non-master control system; and when the first system is a non-master control system, the second system is a master control system or other non-master control systems.
Further, the switching information includes system layout information and target switching subsystem information; the switching information sending module is specifically configured to:
and the master control system obtains a second system according to the system layout information and the target switching subsystem information, and sends the switching information and the video conference server information to the second system.
Further, the media stream sending module is further specifically: and the video conference server is used for learning an RTP address according to the RTP message and sending a media stream to a second system according to the learning result.
The invention has the following advantages:
through the interaction of the main control system and the non-main control system, the main control system performs unified control on the system for receiving the media stream, so that the second system serving as a switching target transmits an RTP message to guide and transmit the server-side media RTP stream to the second system, thereby realizing switching control, realizing that the server-side video stream is switched from the first system to the second system for presentation on the basis of not changing the original system architecture, not influencing the system performance, and ensuring the forwarding efficiency.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic flowchart of a method for controlling transmission of a multi-system media stream based on RTP according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-system media stream transmission control apparatus based on RTP according to an embodiment of the present invention;
fig. 3 is an application scenario diagram of a multi-system media stream transmission control method based on RTP according to an embodiment of the present invention;
FIG. 4 is a timing diagram of media stream transmission control of a RTP-based multi-system media stream transmission control method according to an embodiment of the present invention;
fig. 5 is a timing chart of media stream transmission control of a RTP-based multi-system media stream transmission control method according to another embodiment of the present invention.
Detailed Description
Referring to fig. 1, an embodiment of the present invention provides a method for controlling RTP-based multi-system media streaming, including a video conference server, a master control system, and at least one non-master control system (such as non-master control systems a and B), where the method includes:
step 10, the master control system acquires switching information, informs a first system receiving a media stream, and stops processing the media stream;
step 20, the master control system sends the switching information and the video conference server information to a second system;
step 30, the second system sends an RTP message to the video conference server according to the video conference server information;
and step 40, the video conference server receives and analyzes the RTP message, and then sends the media stream to a second system.
It can be seen that the first system is a current system for receiving and processing a media stream of a video conference server, and the second system is a target system to which the media stream needs to be switched; after switching, the video conference server directly sends the media stream to the second system, and the performance of the master control system cannot be consumed.
Fig. 3 is an application scene diagram of an embodiment of the present invention, after a video terminal accesses a video conference server system, output image presentations of three screens can be provided to a user through a main control system, a non-main control system a and a non-main control system B, respectively; when the first system is a master control system, the second system is a non-master control system (i.e. the media stream is switched from the master control system to a non-master control system a or a non-master control system B); when the first system is a non-master control system, the second system is a master control system or other non-master control systems (namely, the media stream is switched from the non-master control system A to the master control system or the non-master control system B, or the media stream is switched from the non-master control system B to the master control system or the non-master control system A), and the method of the embodiment of the invention realizes the flexible switching and presentation of the remote video among the multiple systems.
Fig. 4 and 5 are timing diagrams of multi-system media stream transmission control, and it can be seen from the diagrams that a control processing module (i.e. a master control processing module) is added in a master control system to perform unified control on systems receiving media streams, and interaction with the master control system is added in a non-master control system; through a simple interactive flow among systems, the RTP stream of the video conference server can be controlled; from the timing chart, the control flow of the embodiment of the present invention and the transmission direction of the actual RTP stream can be clearly understood.
When the first system is a master control system, the processing flow is as follows:
(1) the main control system stops processing the video conference server RTP stream (i.e., media stream) (for example, the main control processing module notifies the main control media module to stop processing the video conference server RTP stream);
(2) the master control system (such as a master control processing module) sends the switching information and the video conference server RTP information to a designated non-master control system (namely a non-master control system A or a non-master control system B);
(3) a non-master control system (namely a non-master control system A or a non-master control system B) sends an RTP message to an RTP port of a video conference server;
(4) the videoconference server resumes destination RTP address learning and sends the RTP stream (i.e., media stream) to the non-master system (i.e., non-master system a or non-master system B).
When the first system is a non-master control system (for example, non-master control system a), the processing flow is as follows:
(1) the main control system (such as a main control processing module) informs the non-main control system A to stop processing the RTP stream (namely the media stream) of the video conference server;
(2) the main control system (such as a main control processing module) sends the switching information and the RTP information of the video conference server to a designated non-main control system B (or a main control system according to the requirement);
(3) a non-main control system B (or a main control system according to the requirement) sends an RTP message to an RTP port of a video conference server;
(4) the video conference server performs the target RTP address learning again, and transfers the RTP stream to the non-master control system B (or the master control system as required).
In the embodiment of the invention, the switching information comprises system layout information and target switching subsystem information, the main control system obtains a second system according to the system layout information and the target switching subsystem information, and the switching information and the video conference server information are sent to the second system.
In a preferred embodiment, the handover information includes the following information:
(1) control field of media handover: instructions for identifying a control;
(2) system layout information: for processing display control;
(3) target switching subsystem information: checking the controlled subsystem information;
(4) media stream information, including media encoding and negotiation parameters: the method is mainly used for decoding after receiving the server-side video RTP.
The master control system obtains a second system according to system layout information and target switching subsystem information, and sends the switching information, video conference server information, a control field of media switching and media stream information to the second system; when the first system is a master control system, the second system is a non-master control system (i.e. the media stream is switched from the master control system to a non-master control system a or a non-master control system B); when the first system is a non-master control system, the second system is a master control system or other non-master control systems (i.e., the media stream is switched from the non-master control system a to the master control system or the non-master control system B, or the media stream is switched from the non-master control system B to the master control system or the non-master control system a).
The second system sends an RTP message to an RTP port of the video conference server according to the control field of the media switching and the information of the video conference server, wherein the RTP message is used for enabling the video conference server to detect an RTP address of the second system;
the video conference server receives and analyzes the RTP message, performs RTP address learning, and sends a media stream to a second system according to the learning result;
the specific process is as follows:
(1) the second system constructs an RTP message and sends the RTP message to an IP (Internet protocol) port and an RTP port of a video conference server;
(2) after forwarding through NAT (Network Address Translation), the Network device will modify the source IP and port into external Address;
(3) after receiving the RTP message, the video conference server end checks the loading content of the RTP message;
(4) and updating the transmitted RTP destination IP and the port.
Through the prior art, such as a media stream traversing method with application number of CN201610770605.8RTP, an SIP server and an SIP communication system, and a method and a device for traversing an RTP multiplexing message through an NATPT device with application number of cn200810246810.x, it can be realized that a video conference server analyzes an RTP message sent by a second system after receiving the RTP message, performs RTP address learning, and sends a media stream to the second system according to the learning result.
And the second system decodes and displays the received media stream sent by the video conference server according to the media stream information in the switching information after receiving the media stream, so that the different-screen presentation of the media stream can be realized.
Based on the same idea, the embodiment of the present invention further provides a device corresponding to the above method, as shown in fig. 2.
Fig. 2 is a schematic structural diagram of an apparatus for controlling RTP-based multi-system media streaming according to an embodiment of the present invention, where the apparatus includes: the system comprises a switching information acquisition module, a switching information sending module, a detection message sending module and a media stream sending module;
a switching information acquisition module, configured to acquire switching information by the master control system, notify a first system that receives a media stream, and stop processing the media stream;
the switching information sending module is used for sending the switching information and the video conference server information to a second system by the master control system;
the message sending module is used for sending an RTP message to the video conference server by the second system according to the video conference server information;
and the media stream sending module is used for sending the media stream to the second system by the video conference server according to the RTP message.
It can be seen that the first system is a current system for receiving and processing a media stream of a video conference server, and the second system is a target system to which the media stream needs to be switched; after switching, the video conference server directly sends the media stream to the second system, and the performance of the master control system cannot be consumed.
Fig. 3 is an application scene diagram of an embodiment of the present invention, after a video terminal accesses a video conference server system, output image presentations of three screens can be provided to a user through a main control system, a non-main control system a and a non-main control system B, respectively; when the first system is a master control system, the second system is a non-master control system (i.e. the media stream is switched from the master control system to a non-master control system a or a non-master control system B); when the first system is a non-master control system, the second system is a master control system or other non-master control systems (namely, the media stream is switched from the non-master control system A to the master control system or the non-master control system B, or the media stream is switched from the non-master control system B to the master control system or the non-master control system A), and the device of the embodiment of the invention realizes the flexible switching and presentation of the remote video among the multiple systems.
Fig. 4 and 5 are timing diagrams of multi-system media stream transmission control, and it can be seen from the diagrams that a control processing module (i.e. a master control processing module) is added in a master control system to perform unified control on systems receiving media streams, and interaction with the master control system is added in a non-master control system; through a simple interactive flow among systems, the RTP stream of the video conference server can be controlled; from the timing chart, the control flow of the embodiment of the present invention and the transmission direction of the actual RTP stream can be clearly understood.
When the first system is a master control system, the processing flow is as follows:
(1) the main control system stops processing the video conference server RTP stream (i.e., media stream) (for example, the main control processing module notifies the main control media module to stop processing the video conference server RTP stream);
(2) the master control system (such as a master control processing module) sends the switching information and the video conference server RTP information to a designated non-master control system (namely a non-master control system A or a non-master control system B);
(3) a non-master control system (namely a non-master control system A or a non-master control system B) sends an RTP message to an RTP port of a video conference server;
(4) the videoconference server resumes destination RTP address learning and sends the RTP stream (i.e., media stream) to the non-master system (i.e., non-master system a or non-master system B).
When the first system is a non-master control system (for example, non-master control system a), the processing flow is as follows:
(1) the main control system (such as a main control processing module) informs the non-main control system A to stop processing the RTP stream (namely the media stream) of the video conference server;
(2) the main control system (such as a main control processing module) sends the switching information and the RTP information of the video conference server to a designated non-main control system B (or a main control system according to the requirement);
(3) a non-main control system B (or a main control system according to the requirement) sends an RTP message to an RTP port of a video conference server;
(4) the video conference server performs the target RTP address learning again, and transfers the RTP stream to the non-master control system B (or the master control system as required).
In the embodiment of the present invention, the handover information includes system layout information and target handover subsystem information; the switching information sending module is specifically configured to: and the master control system obtains a second system according to the system layout information and the target switching subsystem information, and sends the switching information and the video conference server information to the second system.
In a preferred embodiment, the handover information includes the following information:
(1) control field of media handover: instructions for identifying a control;
(2) system layout information: for processing display control;
(3) target switching subsystem information: checking the controlled subsystem information;
(4) media stream information, including media encoding and negotiation parameters: the method is mainly used for decoding after receiving the server-side video RTP.
The master control system obtains a second system according to system layout information and target switching subsystem information, and sends the switching information, video conference server information, a control field of media switching and media stream information to the second system; when the first system is a master control system, the second system is a non-master control system (i.e. the media stream is switched from the master control system to a non-master control system a or a non-master control system B); when the first system is a non-master control system, the second system is a master control system or other non-master control systems (i.e., the media stream is switched from the non-master control system a to the master control system or the non-master control system B, or the media stream is switched from the non-master control system B to the master control system or the non-master control system a).
The media stream sending module is further specifically: and the video conference server is used for learning an RTP address according to the RTP message and sending a media stream to a second system according to the learning result.
The second system sends an RTP message to an RTP port of the video conference server according to the control field of the media switching and the information of the video conference server, wherein the RTP message is used for enabling the video conference server to detect an RTP address of the second system;
the video conference server receives and analyzes the RTP message, performs RTP address learning, and sends a media stream to a second system according to the learning result;
the specific process is as follows:
(1) the second system constructs an RTP message and sends the RTP message to an IP (Internet protocol) port and an RTP port of a video conference server;
(2) after forwarding through NAT (network Address Translation), the network device will modify the source IP and port into external address;
(3) after receiving the RTP message, the video conference server end checks the loading content of the RTP message;
(4) and updating the transmitted RTP destination IP and the port.
Through the prior art, such as a media stream traversing method with application number of CN201610770605.8RTP, an SIP server and an SIP communication system, and a method and a device for traversing an RTP multiplexing message through an NATPT device with application number of cn200810246810.x, it can be realized that a video conference server analyzes an RTP message sent by a second system after receiving the RTP message, performs RTP address learning, and sends a media stream to the second system according to the learning result.
And the second system decodes and displays the received media stream sent by the video conference server according to the media stream information in the switching information after receiving the media stream, so that the different-screen presentation of the media stream can be realized.
The invention realizes the switching control by the interaction of the main control system and the non-main control system and the unified control of the system for receiving the media stream by the main control system, so that the second system which is a switching target transmits the RTP message and transmits the media RTP stream of the server end to the second system from guidance, and the video stream of the server end is switched from the first system to the second system for presentation on the basis of not changing the original system architecture, thereby not influencing the system performance and ensuring the forwarding efficiency. The invention reasonably utilizes the existing RTP address learning technology of the video conference server, the message interaction among subsystems is simpler, the cross-system presentation of the remote RTP stream is realized by using the minimum resource consumption, and the invention has certain superiority compared with the existing mature technology.
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. The processes depicted in the accompanying figures do not necessarily have to be in a particular order or sequential order to achieve desirable results. The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (6)
1. A multi-system media stream transmission control method based on RTP comprises a video conference server, a main control system and at least one non-main control system, and is characterized in that the method comprises the following steps:
step 10, the master control system acquires switching information, informs a first system receiving a media stream, and stops processing the media stream, wherein the switching information comprises system layout information and target switching subsystem information;
step 20, the master control system sends the switching information and the video conference server information to a second system, wherein the video conference server information comprises a video conference server IP address and an RTP port;
step 30, the second system sends an RTP message to the video conference server according to the video conference server information;
step 40, the video conference server receives and analyzes the RTP message, and then sends a media stream to a second system;
when the first system is a non-master control system, the second system is a master control system or other non-master control systems, and the master control system and at least one non-master control system belong to subsystems of the same video terminal.
2. An RTP-based multi-system media streaming control method according to claim 1, wherein: the step 20 is further specifically:
and the master control system obtains a second system according to the system layout information and the target switching subsystem information, and sends the switching information and the video conference server information to the second system.
3. The RTP-based multi-system media stream transmission control method according to claim 1, wherein the step 40 further includes:
and step 40, the video conference server receives and analyzes the RTP message, performs RTP address learning, and sends the media stream to a second system according to the learning result.
4. A multi-system media stream transmission control device based on RTP comprises a video conference server, a main control system and at least one non-main control system, and is characterized in that: the device comprises a switching information acquisition module, a switching information sending module, a detection message sending module and a media stream sending module;
a switching information obtaining module, configured to obtain switching information by the master control system, notify a first system that receives a media stream, and stop processing the media stream, where the switching information includes system layout information and target switching subsystem information;
the switching information sending module is used for sending the switching information and the video conference server information to a second system by the main control system, wherein the video conference server information comprises a video conference server IP address and an RTP port;
the message sending module is used for sending an RTP message to the video conference server by the second system according to the video conference server information;
the media stream sending module is used for sending the media stream to a second system by the video conference server according to the RTP message;
when the first system is a non-master control system, the second system is a master control system or other non-master control systems, and the master control system and at least one non-master control system belong to subsystems of the same video terminal.
5. An apparatus for controlling RTP-based multi-system media stream transmission according to claim 4, wherein: the switching information sending module is specifically configured to:
and the master control system obtains a second system according to the system layout information and the target switching subsystem information, and sends the switching information and the video conference server information to the second system.
6. The RTP-based multi-system media stream transmission control device according to claim 4, wherein the media stream sending module further includes: and the video conference server is used for learning an RTP address according to the RTP message and sending a media stream to a second system according to the learning result.
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