CN111556340B - Safe cross-platform video stream playing method - Google Patents
Safe cross-platform video stream playing method Download PDFInfo
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- CN111556340B CN111556340B CN202010437782.0A CN202010437782A CN111556340B CN 111556340 B CN111556340 B CN 111556340B CN 202010437782 A CN202010437782 A CN 202010437782A CN 111556340 B CN111556340 B CN 111556340B
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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
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/858—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot
- H04N21/8586—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot by using a URL
Abstract
The invention discloses a safe cross-platform video stream playing method, which comprises the following steps: 1. the method comprises the steps that HTTPS connection is established between a client and a DASH server, and the client initiates an MPD index file request; 2. the DASH server packs the original video stream into a DASH video fragment and an MPD index file to complete the encryption of the URL tag attributes of the video fragment and the MPD file; 3. the method comprises the steps that a server receives a request of a client for initiating an MPD index file, and sends an encrypted MPD index file, a decryption key of each DASH video fragment and a server CRC (cyclic redundancy check) value; 4. the client receives a file sent by the server; 5. comparing the CRC value of the server side with the CRC value of the client side; 6. and the client dynamically selects a proper URL to initiate a video fragment request to the DASH server according to the current network condition, analyzes the video fragments according to the decryption key value corresponding to each video fragment, and finishes the playing of the video stream. The method of the invention provides encryption protection for the video stream fragments in the transmission process, and improves the safety in the video transmission process.
Description
Technical Field
The invention belongs to the technical field of internet streaming media, and particularly relates to a safe cross-platform video stream playing method.
Background
With the development of Streaming media technology and HTML5 technology, the HTTP Adaptive transport protocol gradually replaces the traditional real-time Streaming transport protocol (RTP and RTSP), and the widely used Adaptive transport protocols mainly include HDS from Adobe, MSS from microsoft, and HLS from apple, but all of them have their own data segmentation formats, and based on this, the MPEG, in conjunction with other 3GPP, etc., promulgates the dash (dynamic Adaptive Streaming over HTTP) protocol international standard.
By means of the cross-platform property of the browser, the DASH protocol can conveniently complete the playing of cross-platform adaptive streaming media by means of the mse (media Source extension) extension technology provided by the HTML5 standard, and the two most important parts of the DASH protocol are an MPD (media Presentation description) index file and video clips, wherein the MPD file is in an XML format and describes detailed information such as the frame rate, resolution, URL and the like of the current clip. The client requests the MPD file in real time to the server and completes analysis, selects a proper URL tag in the MPD file according to the current network condition, and then initiates a video slicing request to the server by using the URL to complete the playing of the video stream. Nowadays more and more companies choose DASH technology on video streaming technology options, such as YouTube, Google, Facebook, arckian, etc.
However, in a common system for transmitting video stream based on DASH, in view of the openness of HTTP protocol, the whole video slicing request and transmission process are performed in clear text; some mobile devices also buffer some video fragments locally for offline reading in order to improve user experience, but these video fragments are not encrypted, and only simple file merging is needed to view a complete video, so that great potential safety hazards exist in file transmission.
The application provides a safe cross-platform video stream playing method, which has important practical application value for preventing video fragments from being leaked and video copyright from being damaged due to the fact that an MPD file is stolen.
Disclosure of Invention
The invention aims to provide a safe cross-platform video stream playing method, which completes cross-platform playing of videos on the basis of a DASH protocol, and can effectively improve the safety of a video data transmission process by carrying out encryption transmission and storage on video fragments and MPD file contents.
The technical scheme adopted by the invention is that a safe cross-platform video stream playing method specifically comprises the following steps:
step 1, establishing an HTTPS connection request between a client and a server, and initiating an MPD index file request by the client;
step 2, the DASH server of the server packs the original video stream into a plurality of DASH video fragments and MPD index files, simultaneously encrypts URL tags of each DASH video fragment and each MPD index file respectively to obtain and store the encrypted MPD index files and decryption key values of each DASH video fragment, and calculates CRC values of the server;
step 3, the DASH server receives an MPD index file request initiated by the client, and transmits the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC value to the client through an RPC interface according to a fixed format;
step 4, the client receives the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC check value transmitted by the DASH server, and calculates the client CRC check value;
step 5, the client compares the CRC value of the server with the CRC value of the client:
if the CRC value of the server side is the same as the CRC value of the client side, the client side further analyzes to finish decryption of a URL (uniform resource locator) tag of an MPD (MPD media stream index) file, and analyzes and stores a decryption key value of each DASH video fragment;
if the server side CRC check value is different from the client side CRC check value, the client side discards the encrypted MPD index file, each DASH video fragment decryption key value and the server side CRC check value transmitted by the DASH server in the step 3, selects a new original video stream and repeats the steps 1-4 until the server side CRC check value is the same as the client side CRC check value, and the client side further analyzes to complete decryption of the URL label of the MPD index file and simultaneously analyzes and stores each DASH video fragment decryption key value;
and step 6, the client dynamically selects a proper URL tag of the MPD index file according to the current network condition, initiates a video request to the DASH server, and when the DASH server receives the video request, the client decrypts each DASH video fragment according to each DASH video fragment decryption key value stored in the step 5 to finish the playing of the original video stream.
The present invention is also characterized in that,
the specific process of step 1 is as follows:
step 1.1, starting a DASH server at a service end to enable the DASH server to be in a monitoring state and waiting for a client connection request;
and step 1.2, logging in the client, and initiating an MPD index file request to a DASH server program by carrying token information and a timestamp returned after successful logging in.
The process of packing the original video stream in step 2 specifically comprises: the DASH server starts a video processing thread, packs and processes original video streams into an MPEG-DASH format, generates a plurality of DASH video fragments and MPD index files, and stores the DASH video fragments and the MPD index files in a server side.
In the step 2, DASH video segments are encrypted and stored in an AES-128 encryption mode, and URL tags of MPD index files are encrypted and stored in an exclusive-or encryption algorithm;
and in the step 2, each DASH video fragment decryption key value is dynamically generated according to token information, a timestamp and equipment information returned after the client successfully logs in, so that different video fragment decryption algorithms are ensured, and the safety of the whole video file is ensured.
In step 2, the CRC check value is calculated by writing into two parts of contents, namely, an MPD index file and a DASH video segment decryption secret key value.
The fixed format of file delivery in step 3 is: 2-byte MPD file content length + MPD file content + 2-byte server CRC check value length + server CRC check value + 4-byte DASH video segment decryption key value length + DASH video segment decryption key value.
In the method of the present invention, depending on the adaptivity of the DASH protocol, each segment may have a plurality of corresponding URLs, and the client dynamically selects a suitable URL according to the current network status, initiates a video segment request to the server, decrypts the returned video segment, and completes the video stream playing.
The invention has the beneficial effects that: the invention relates to a safe cross-platform video stream playing method, which combines the characteristics of a DASH protocol, completes the encryption transmission of video fragment files on the basis of the cross-platform transmission playing of video streams, further increases the difficulty of video cracking because the key values required by the decryption of each fragment are different, improves the safety of video stream data transmitted in a DASH system, and plays a good role in promoting the copyright protection of video files.
Drawings
Fig. 1 is a flowchart of a secure cross-platform video stream playing method according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a safe cross-platform video stream playing method, which specifically comprises the following steps as shown in figure 1:
step 1, starting a DASH server at a server side to enable the DASH server to be in a monitoring state, establishing an HTTPS connection request between a client side and the server side, and initiating an MPD index file request to a DASH server program by the client side after logging in and carrying token information and a timestamp returned after the logging in is successful;
step 2, starting a video processing thread by the DASH server, packaging and processing an original video stream into an MPEG-DASH format, generating a plurality of DASH video fragments and an MPD index file and storing the DASH video fragments and the MPD index file in a server, and simultaneously respectively encrypting each DASH video fragment by adopting an AES-128 encryption mode; encrypting the URL tag of the MPD index file by using an XOR encryption algorithm to obtain and store the encrypted MPD index file and each DASH video fragment decryption key value, and calculating a CRC value of a server;
and each DASH video fragment decryption key value is dynamically generated according to token information, a timestamp and equipment information returned after the client successfully logs in, so that different video fragment decryption algorithms are ensured, and the safety of the whole video file is ensured.
Step 3, the DASH server receives an MPD index file request initiated by the client, and transmits the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC value to the client through an RPC interface according to a fixed format;
the fixed format is specifically as follows: 2-byte MPD file content length + MPD file content + 2-byte server CRC check value length + server CRC check value + 4-byte DASH video segment decryption key value length + DASH video segment decryption key value.
Step 4, the client receives the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC check value transmitted by the DASH server, and calculates the client CRC check value;
step 5, the client compares the CRC value of the server with the CRC value of the client:
if the CRC value of the server side is the same as the CRC value of the client side, the client side further analyzes to finish decryption of a URL (uniform resource locator) tag of an MPD (MPD media stream index) file, and analyzes and stores a decryption key value of each DASH video fragment;
if the server side CRC check value is different from the client side CRC check value, the client side discards the encrypted MPD index file, each DASH video fragment decryption key value and the server side CRC check value transmitted by the DASH server in the step 3, selects a new original video stream and repeats the steps 1-4 until the server side CRC check value is the same as the client side CRC check value, and the client side further analyzes to complete decryption of the URL label of the MPD index file and simultaneously analyzes and stores each DASH video fragment decryption key value;
and step 6, the client dynamically selects a proper URL tag of the MPD index file according to the current network condition, initiates a video request to the DASH server, and when the DASH server receives the video request, the client decrypts each DASH video fragment according to each DASH video fragment decryption key value stored in the step 5 to finish the playing of the original video stream.
In the method, the CRC value is obtained by calculating two parts of contents, namely, a decryption secret key value written into an MPD index file and a DASH video fragment, in order to ensure efficiency and safety, a DASH server encrypts an attribute value of an important part URL tag of the MPD index file, and simultaneously writes a DASH video fragment decryption key corresponding to the URL into the tail part of the MPD index file to calculate the CRC value of the whole file.
Depending on the adaptivity of the DASH protocol, each DASH video fragment may have a plurality of corresponding URLs, and the client dynamically selects a suitable URL according to the current network condition, initiates a video fragment request to the server, decrypts the returned video fragment, and completes video stream playing.
The method of the invention completes the encryption transmission of the video fragment files on the basis of the cross-platform transmission and playing of the video stream, and ensures that each video fragment decryption algorithm is different because each DASH video fragment decryption key value is dynamically generated according to the token information, the timestamp and the equipment information returned after the successful login of the client, thereby further increasing the difficulty of video decryption, improving the security of the video stream data transmitted in the DASH system, and having important practical application value for preventing the video fragment leakage and the video copyright damage caused by the MPD file stealing.
Claims (3)
1. A safe cross-platform video stream playing method is characterized by comprising the following steps:
step 1, establishing an HTTPS connection request between a client and a server, and initiating an MPD index file request by the client;
the specific process is as follows:
step 1.1, starting a DASH server at a service end to enable the DASH server to be in a monitoring state and waiting for a client connection request;
step 1.2, a client logs in and initiates an MPD index file request to a DASH server with token information and a timestamp returned after successful login;
step 2, the DASH server of the server packs the original video stream into a plurality of DASH video fragments and MPD index files, simultaneously encrypts URL tags of each DASH video fragment and each MPD index file respectively to obtain and store the encrypted MPD index files and decryption key values of each DASH video fragment, and calculates CRC values of the server;
the process of the original video stream packing processing specifically comprises the following steps: starting a video processing thread by a DASH server, packaging and processing an original video stream into an MPEG-DASH format, generating a plurality of DASH video fragments and an MPD index file, and storing the DASH video fragments and the MPD index file in a server;
the DASH video segments are encrypted and stored in an AES-128 encryption mode, and URL tags of MPD index files are encrypted and stored in an exclusive-or encryption algorithm;
step 3, the DASH server receives an MPD index file request initiated by the client, and transmits the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC value to the client through an RPC interface according to a fixed format;
each DASH video fragment decryption key value is dynamically generated according to token information, a timestamp and equipment information returned after a client successfully logs in, so that different video fragment decryption algorithms are guaranteed, and the safety of the whole video file is guaranteed;
step 4, the client receives the encrypted MPD index file, each DASH video fragment decryption key value and the server CRC check value transmitted by the DASH server, and calculates the client CRC check value;
step 5, the client compares the CRC value of the server with the CRC value of the client:
if the CRC value of the server side is the same as the CRC value of the client side, the client side further analyzes to finish decryption of a URL (uniform resource locator) tag of an MPD (MPD media stream index) file, and analyzes and stores a decryption key value of each DASH video fragment;
if the server side CRC check value is different from the client side CRC check value, the client side discards the encrypted MPD index file, each DASH video fragment decryption key value and the server side CRC check value transmitted by the DASH server in the step 3, selects a new original video stream and repeats the steps 1-4 until the server side CRC check value is the same as the client side CRC check value, and the client side further analyzes to complete decryption of the URL label of the MPD index file and simultaneously analyzes and stores each DASH video fragment decryption key value;
and step 6, the client dynamically selects a proper URL tag of the MPD index file according to the current network condition, initiates a video request to the DASH server, and when the DASH server receives the video request, the client decrypts each DASH video fragment according to each DASH video fragment decryption key value stored in the step 5 to finish the playing of the original video stream.
2. The method of claim 1, wherein the CRC check value in step 2 is calculated by writing both contents of MPD index file and decryption secret key value of DASH video segment.
3. The method as claimed in claim 1, wherein the fixed format of file delivery in step 3 is: 2-byte MPD file content length + MPD file content + 2-byte server CRC check value length + server CRC check value + 4-byte DASH video segment decryption key value length + DASH video segment decryption key value.
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| CN112188308B (en) * | 2020-08-31 | 2022-08-12 | 北京火眼目测科技有限公司 | Method and device for generating encrypted video file library |
| CN112511862B (en) * | 2020-11-12 | 2022-09-13 | 江苏大学 | Method for checking MPEG-DASH video stream in NDN |
| CN112738560A (en) * | 2020-12-28 | 2021-04-30 | 厦门市美亚柏科信息股份有限公司 | Video data transmission method, receiving method, server and client |
| CN112702582B (en) * | 2021-01-06 | 2022-07-15 | 贵州大学 | Secure transmission method and device for monitoring video based on SM2 |
| CN112860920A (en) * | 2021-01-19 | 2021-05-28 | 中国联合网络通信集团有限公司 | Media stream data storage method, electronic device and computer readable medium |
| CN114786042A (en) * | 2022-04-12 | 2022-07-22 | 北京字节跳动网络技术有限公司 | Video playing method, device, equipment and storage medium |
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