CN114221941B - Webrtc-to-onvif audio/video code stream conversion method and device - Google Patents
Webrtc-to-onvif audio/video code stream conversion method and device Download PDFInfo
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- CN114221941B CN114221941B CN202111556301.9A CN202111556301A CN114221941B CN 114221941 B CN114221941 B CN 114221941B CN 202111556301 A CN202111556301 A CN 202111556301A CN 114221941 B CN114221941 B CN 114221941B
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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
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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]
- H04N21/20—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
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- Databases & Information Systems (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
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Abstract
The application provides a method and a device for converting webtc to onvif audio and video code streams, wherein the method comprises the following steps: acquiring a webtc live code stream, analyzing code stream data based on a webtc protocol, and acquiring a target address IP and SDP data; encapsulating the extracted SDP data according to the onvif protocol again, and then outputting a live code stream based on the onvif protocol to a target address IP; the onvif equipment receives a live code stream based on the onvif protocol, and multicasts the live code stream into RTMP audio and video for playing. The device executes the method, and specifically comprises the following steps: a data inlet is connected with and acquires a live code stream based on a webrtc protocol; the protocol analysis unit is used for analyzing the obtained live code stream based on the webrtc protocol to obtain a target address IP and SDP data; the encapsulation unit encapsulates SDP data based on the onvif protocol, adds an HTTP protocol header to the encapsulated data and generates a live code stream based on the onvif protocol; and outputting the live code stream based on the onvif protocol by a data outlet.
Description
Technical Field
The application belongs to the technical field of networks, and particularly relates to a method and a device for converting webtc to onvif audio and video code streams.
Background
Currently, the main live broadcast technology is stable and reliable transmission based on the webtc protocol, supports communication with traditional GB28181 protocol equipment, but fails to realize communication with onvif protocol equipment, and code stream conversion from the webtc to the onvif provides possibility of linkage between different equipment. In fact, the data layer of the webtc protocol or the onvif protocol takes SDP (Session Description Protocol ) as a main data format, that is, the data layer is communicated with the data layer, so that a communication basis is provided for the webtc device and the onvif device.
Disclosure of Invention
The application provides a method and a device for converting webtc to onvif audio and video code streams, which meet the requirements of code stream transmission and conversion and have the following specific technical contents:
the Webrtc-onvif audio and video code stream conversion method comprises the following steps:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP and SDP data;
step 2, the extracted SDP data is encapsulated again according to the onvif protocol, and then a live code stream based on the onvif protocol is output to a target address IP;
and 3, the onvif equipment receives a live code stream based on the onvif protocol to form RTMP audio and video for playing.
Specifically, in step 1, a video source address and an SDP data length are extracted when analyzing the webtc protocol-based code stream data; in step 2, when the SDP data is repackaged, the Content-Type is designated as application/dp in the packet header of the DESCRIBE part, the Content-Base is the video source address, and the Content-Length is the SDP data Length; and packaging the DESCRIBE packet according to the HTTP packet format, and converting the HTTP packet into an HTTP audio/video stream.
The webtc-onvif audio/video code stream conversion device of the application comprises a processor, a memory and a code stream conversion program stored on the memory and capable of being operated by the processor, wherein the processor executes the following steps when executing the code stream conversion program:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP and SDP data;
and step 2, packaging the extracted SDP data again according to the onvif protocol, and then outputting a live code stream based on the onvif protocol to the target address IP.
The webtc-onvif audio/video code stream conversion device of the application comprises:
a data inlet is connected with and acquires a live code stream based on a webrtc protocol;
the protocol analysis unit is used for analyzing the obtained live code stream based on the webrtc protocol to obtain a target address IP and SDP data;
the encapsulation unit encapsulates the SDP data based on the onvif protocol, adds an HTTP protocol header to the encapsulated data and generates a live code stream based on the onvif protocol;
and outputting the live code stream based on the onvif protocol by a data outlet.
The beneficial effects of the application are as follows: the method meets the conversion requirement of live streaming to the onvif protocol output stream based on the webrtc protocol, realizes linkage communication between the webrtc equipment and the onvif equipment, overcomes the defect that two protocol code streams cannot be communicated in the prior art, and has better technical property and practicability.
Drawings
Fig. 1 is a code stream conversion flowchart of the present application.
Fig. 2 is a second code stream conversion flow chart of the present application.
Detailed Description
The scheme of the application is further described as follows:
the code stream data based on the onvif protocol is encapsulated in RTSP format;
the control layer of Onvif is divided into several stages of DESCRIBE/SETUP/PLAY/TEARDW, for the data layer, SDP (Session Description Protocol ) is used as the main data format, and the data layer of webtc is developed based on SDP, so that the control layer instruction is not said that the Onvif protocol data is communicated with the webtc protocol data, thus providing communication possibility for application supporting the webtc protocol and equipment supporting the Onvif protocol, in particular providing possibility for linkage of different protocol equipment.
Referring to fig. 1 and 2, the method for converting webtc to onvif audio/video code stream according to the present application comprises the following steps:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP, SDP data, a video source address and SDP data length; the parsing process removes the signaling data and only retains the audio and video data in SDP format;
step 2, the extracted SDP data is encapsulated again according to the onvif protocol, wherein the method comprises the following steps: the method comprises the steps of designating Content-Type as application/dp in a packet header of a DESCRIBE part, designating Content-Base as a video source address, and designating Content-Length as SDP data Length; packaging the DESCRIBE packet according to the HTTP packet format, and converting the HTTP packet into an HTTP audio/video stream; finally, outputting a live code stream based on an onvif protocol to a target address IP;
and 3, receiving the live code stream based on the onvif protocol by the onvif equipment, multicasting the live code stream into RTMP audio and video for playing.
When the method is applied, the method is laid out on a conversion device, a data inlet of the conversion device acquires a live code stream based on a webrtc protocol, and a data outlet of the conversion device outputs the live code stream based on an onvif protocol; the live code stream generated by the Webrtc application is converted by the Webrtc server to the conversion device, and then output to the onvif server by the onvif client.
The application also claims a webtc-onvif audio/video code stream conversion device for implementing the method, which comprises a processor, a memory and a code stream conversion program stored on the memory and capable of being run by the processor, and is characterized in that the processor executes the following steps when executing the code stream conversion program:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP, SDP data, a video source address and SDP data length; the parsing process removes the signaling data and only retains the audio and video data in SDP format;
and step 2, packaging the extracted SDP data according to the onvif protocol again, wherein the step comprises the following steps: the method comprises the steps of designating Content-Type as application/dp in a packet header of a DESCRIBE part, designating Content-Base as a video source address, and designating Content-Length as SDP data Length; packaging the DESCRIBE packet according to the HTTP packet format, and converting the HTTP packet into an HTTP audio/video stream; and finally outputting the live code stream based on the onvif protocol to the target address IP.
The application also claims a further webtc-onvif audio-video code stream conversion device for implementing the method, which comprises:
a data inlet is connected with and acquires a live code stream based on a webrtc protocol;
the protocol analysis unit is used for analyzing the obtained live code stream based on the webrtc protocol to obtain a target address IP and SDP data;
the encapsulation unit encapsulates the SDP data based on the onvif protocol, adds an HTTP protocol header to the encapsulated data and generates a live code stream based on the onvif protocol;
and outputting the live code stream based on the onvif protocol by a data outlet.
The webtc protocol core is RTMP protocol, the onvif protocol core is RTSP protocol, the webtc is converted into onvif, the SDP data is re-packaged according to the RTSP format, the SDP data is packaged in a DESCRIBE part like HTTP back package, and then the data is sent according to the data, so that the RTMP stream is sent to the conversion device by the webtc, and the RTMP stream is converted into RTSP by the conversion device and sent to the onvif device.
The method meets the conversion requirement of live streaming to the onvif protocol output stream based on the webrtc protocol, realizes linkage communication between the webrtc equipment and the onvif equipment, overcomes the defect that two protocol code streams cannot be communicated in the prior art, and has better technical property and practicability.
The above-mentioned preferred embodiments should be regarded as illustrative examples of embodiments of the present application, and all such technical deductions, substitutions, improvements made on the basis of the same, similar or similar embodiments of the present application should be regarded as the protection scope of the present patent.
Claims (8)
1. A webtc-to-onvif audio-video code stream conversion method, comprising the steps of:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP and SDP data;
step 2, the extracted SDP data is encapsulated again according to the onvif protocol, and then a live code stream based on the onvif protocol is output to a target address IP;
and 3, receiving the live code stream based on the onvif protocol by the onvif equipment, multicasting the live code stream into RTMP audio and video for playing.
2. The method for converting a webtc to an onvif audio video code stream according to claim 1, wherein:
in step 1, extracting a video source address and an SDP data length when analyzing code stream data based on a webtc protocol;
in step 2, when the SDP data is repackaged, the Content-Type is designated as application/dp in the packet header of the DESCRIBE part, the Content-Base is the video source address, and the Content-Length is the SDP data Length;
and packaging the DESCRIBE packet according to the HTTP packet format, and converting the HTTP packet into an HTTP audio/video stream.
3. The method for converting a webtc to an onvif audio video code stream according to claim 1, wherein: in step 1, the parsing process removes the signaling data while retaining only the audio-video data in SDP format.
4. The method for converting a webtc to an onvif audio video code stream according to claim 1, wherein: the code stream based on the webtc protocol is encapsulated in RTMP format, and the code stream based on the onvif protocol is encapsulated in RTSP format.
5. The method for converting a webtc to an onvif audio video code stream according to claim 1, wherein: the method comprises the steps that the method is arranged on a conversion device, a data inlet of the conversion device obtains a live code stream based on a webrtc protocol, and a data outlet of the conversion device outputs the live code stream based on an onvif protocol;
the live code stream generated by the Webrtc application is converted by the Webrtc server to the conversion device, and then output to the onvif server by the onvif client.
6. A webtc-onvif audio-video code stream conversion device, comprising a processor, a memory and a code stream conversion program stored in the memory and capable of being operated by the processor, wherein the processor executes the following steps when executing the code stream conversion program:
step 1, acquiring a webrtc live code stream, analyzing code stream data based on a webrtc protocol, and acquiring a target address IP and SDP data;
and step 2, packaging the extracted SDP data again according to the onvif protocol, and then outputting a live code stream based on the onvif protocol to the target address IP.
7. The apparatus of claim 6, wherein the processor when executing the stream conversion program further comprises the steps of:
in step 1, extracting a video source address and an SDP data length when analyzing code stream data based on a webtc protocol;
in step 2, when the SDP data is repackaged, the Content-Type is designated as application/dp in the packet header of the DESCRIBE part, the Content-Base is the video source address, and the Content-Length is the SDP data Length; and packaging the DESCRIBE packet according to the HTTP packet format, and converting the HTTP packet into an HTTP audio/video stream.
8. A webtc-to-onvif audio/video code stream conversion device, comprising:
a data inlet is connected with and acquires a live code stream based on a webrtc protocol;
the protocol analysis unit is used for analyzing the obtained live code stream based on the webrtc protocol to obtain a target address IP and SDP data;
the encapsulation unit encapsulates the SDP data based on the onvif protocol, adds an HTTP protocol header to the encapsulated data and generates a live code stream based on the onvif protocol;
and outputting the live code stream based on the onvif protocol by a data outlet.
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