CN107770130B - Multimedia content acquisition method and device - Google Patents
Multimedia content acquisition method and device Download PDFInfo
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- CN107770130B CN107770130B CN201610681077.9A CN201610681077A CN107770130B CN 107770130 B CN107770130 B CN 107770130B CN 201610681077 A CN201610681077 A CN 201610681077A CN 107770130 B CN107770130 B CN 107770130B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
Abstract
The embodiment of the invention provides a multimedia content acquisition method and a multimedia content acquisition device, which are applied to terminal equipment, wherein the method comprises the following steps: after acquiring the authority of any tariff multimedia content, sending a Media Presentation Description (MPD) acquisition request corresponding to the tariff multimedia content to a server, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection; receiving an MPD file sent by the server, and acquiring a time-effect code contained in the MPD file; running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; sequentially sending a fragment request containing the names of the multimedia fragments to the server, and receiving the index fragment and the multimedia fragment sent by the server; wherein the index shard has been encrypted using the key. The embodiment of the invention can protect the safety of the tariff multimedia content.
Description
Technical Field
The present invention relates to the field of multimedia processing technologies, and in particular, to a method and an apparatus for acquiring multimedia content.
Background
DASH (Dynamic Adaptive Streaming over HTTP, Dynamic Adaptive Streaming over HTTP based) is a Streaming media Adaptive transmission technology. When the terminal equipment acquires the multimedia content by applying the technology, especially when the multimedia content is acquired in a wireless environment, parameters such as the downloading rate and the like can be adaptively adjusted according to the current bandwidth, so that the user experience is improved. Therefore, the method has better transmission, compatibility and expandability, and has wider market and application prospects.
The operational flow of the conventional DASH streaming technology is as follows: the server acquires multimedia content and encapsulates the multimedia content into data in a format specified by a DASH protocol according to an international standard, and generates a corresponding MPD (Media presentation description) file, wherein the MPD file describes information such as a coding mode, multimedia duration, multimedia type, code rate, URL (Uniform Resource Locator) and the like of the multimedia content.
And the terminal equipment acquires the MPD file from the server by sending an MPD acquisition request, analyzes and selects a proper code rate by combining a code rate decision method. And then sending a fragmentation request to the server to request the multimedia fragments, and finally decoding and playing the obtained multimedia fragments locally.
However, for the multimedia content of the tariff class, when the terminal device sends a fragmentation request to the server after the terminal device obtains the acquisition right of any tariff multimedia content, the request may be intercepted by other terminal devices; or, when the server sends the corresponding multimedia fragment to the terminal device, the multimedia fragment may also be intercepted by other terminal devices. Therefore, how to protect the security of the premium multimedia content is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention aims to provide a multimedia content acquisition method and a multimedia content acquisition device so as to protect the safety of tariff multimedia content. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a multimedia content obtaining method, which is applied to a terminal device, and the method includes:
after acquiring the authority of any tariff multimedia content, sending a Media Presentation Description (MPD) acquisition request corresponding to the tariff multimedia content to a server, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection;
receiving an MPD file sent by the server, and acquiring a time-effect code contained in the MPD file;
running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
sequentially sending a fragment request containing the names of the multimedia fragments to the server, and receiving the index fragment and the multimedia fragment sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
Optionally, after obtaining the acquisition right of any tariff multimedia content, before sending a media presentation description MPD acquisition request corresponding to the tariff multimedia content to a server, the method further includes:
and receiving the preset number of multimedia fragments sent by the server and displaying the multimedia fragments.
Optionally, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
In a second aspect, an embodiment of the present invention provides a multimedia content obtaining method, which is applied to a server, and the method includes:
receiving a Media Presentation Description (MPD) acquisition request sent by a terminal device, and when the requested multimedia content is the tariff multimedia content of which the terminal device has acquired the acquisition permission, operating a preset exchange algorithm to negotiate with the terminal device to obtain a key corresponding to the connection;
sending an MPD file containing a time-efficient code to the terminal equipment;
running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
constructing a corresponding relation between each multimedia fragment name and each multimedia fragment, receiving a fragment request containing the multimedia fragment name sent by the terminal equipment, and sending a corresponding index fragment and the multimedia fragment to the terminal equipment; wherein the index shard has been encrypted using the key.
Optionally, before receiving a media presentation description MPD acquisition request sent by a terminal device, the method further includes:
and sending a preset number of multimedia fragments to the terminal equipment.
Optionally, the receiving a fragment request including a multimedia fragment name sent by the terminal device, and sequentially sending a corresponding index fragment and a corresponding multimedia fragment to the terminal device includes:
receiving a fragment request which is sent by the terminal equipment and contains a multimedia fragment name, determining partial multimedia fragments of the tariff multimedia content which are sent to the terminal equipment according to the corresponding relation between the locally stored terminal equipment identification and the sent multimedia fragment name, and sequentially sending multimedia fragments of the tariff multimedia content which are not sent to the terminal equipment.
Optionally, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
In a third aspect, an embodiment of the present invention provides a multimedia content obtaining apparatus, which is applied to a terminal device, and the apparatus includes:
the execution module is used for sending a Media Presentation Description (MPD) acquisition request corresponding to any tariff multimedia content to the server after the acquisition authority of the tariff multimedia content is acquired, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection;
the receiving module is used for receiving the MPD file sent by the server and acquiring the timeliness code contained in the MPD file;
the operation module is used for operating a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module is used for sequentially sending a fragment request containing the names of the multimedia fragments to the server and receiving the index fragment and the multimedia fragments sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
Optionally, the apparatus further comprises:
and the display module is used for receiving the preset number of multimedia fragments sent by the server and displaying the multimedia fragments.
Optionally, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
In a fourth aspect, an embodiment of the present invention provides a multimedia content obtaining apparatus, which is applied to a server, and the apparatus includes:
the receiving module is used for receiving a Media Presentation Description (MPD) acquisition request sent by a terminal device, and when the request is the tariff multimedia content of which the terminal device has acquired the acquisition permission, a preset exchange algorithm is operated to negotiate with the terminal device to obtain a key corresponding to the connection;
the first sending module is used for sending an MPD file containing a time-efficient code to the terminal equipment;
the operation module is used for operating a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module is used for constructing the corresponding relation between each multimedia fragment name and each multimedia fragment, receiving a fragment request containing the multimedia fragment name sent by the terminal equipment, and sending the corresponding index fragment and the corresponding multimedia fragment to the terminal equipment; wherein the index shard has been encrypted using the key.
Optionally, the apparatus further comprises:
and the second sending module is used for sending the preset number of multimedia fragments to the terminal equipment.
Optionally, the processing module is specifically configured to receive a fragment request that includes names of the multimedia fragments and is sent by the terminal device, determine, according to a correspondence between locally stored identifiers of the terminal device and the names of the sent multimedia fragments, a part of the multimedia fragments of the tariff multimedia content that have been sent to the terminal device, and send, in sequence, the multimedia fragments of the tariff multimedia content that have not been sent to the terminal device.
Optionally, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
The embodiment of the invention provides a method and a device for acquiring multimedia contents, wherein when a terminal device is connected with a server, the terminal device can negotiate with the server to obtain a key corresponding to the connection, the server can determine a time-effect code and send the time-effect code to the terminal device through an MPD (media distribution profile), and then the terminal device can run a preset encryption algorithm according to the key and the time-effect code to obtain the name of each multimedia fragment. And the server can also run the preset encryption algorithm to obtain the names of the multimedia fragments according to the secret key and the time-effect code, and construct the corresponding relation between the names of the multimedia fragments and the multimedia fragments. Therefore, the terminal device may send a fragment request including the names of the multimedia fragments to the server, and obtain the corresponding index fragment and multimedia fragment sent by the server.
Because the key and the time-effect code can be obtained only by the server and the terminal equipment, the name of each multimedia fragment can be obtained only by calculation of the server and the terminal equipment, and the key is effective only in the local connection process, only the terminal equipment can obtain the corresponding multimedia fragment through the name of each multimedia fragment. Even if other terminals intercept the names of the multimedia fragments, when the other terminals send the fragment requests to the server, the server renegotiates the key with the terminal equipment, and the multimedia fragments are not directly sent to the terminal equipment. When the index fragment and the multimedia fragment sent to the terminal equipment by the server are intercepted by other terminal equipment, the terminal equipment can not normally display the multimedia content because the index fragment is encrypted, so that the safety of the tariff multimedia content can be protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a multimedia content obtaining method according to an embodiment of the present invention;
FIG. 2 is another flowchart of a multimedia content obtaining method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multimedia content acquiring apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a multimedia content acquiring apparatus according to an embodiment of the present invention.
Detailed Description
In order to protect the security of tariff multimedia content, the embodiment of the invention provides a multimedia content acquisition method and a multimedia content acquisition device.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to protect the security of premium multimedia content, an embodiment of the present invention provides a multimedia content obtaining method, as shown in fig. 1, the method may include the following steps:
s101, after obtaining the obtaining authority of any tariff multimedia content, sending a Media Presentation Description (MPD) obtaining request corresponding to the tariff multimedia content to a server, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection.
The method provided by the embodiment of the invention can be applied to terminal equipment. Specifically, the terminal device may be a desktop computer, a portable computer, an intelligent mobile terminal, or the like.
In the embodiment of the invention, the terminal equipment can obtain the acquisition right of any tariff multimedia content. For example, the terminal device may pay the fee of the tariff multimedia content through the third party payment platform, and further obtain the acquisition right of the multimedia content.
After obtaining the right to acquire any tariff multimedia content, the terminal device may further request the tariff multimedia content from the server. Specifically, the terminal device may send a media presentation description MPD acquisition request corresponding to the tariff multimedia content to the server, so as to acquire an MPD file.
In the embodiment of the present invention, in order to protect the security of the tariff multimedia content, after the terminal device sends the MPD acquisition request to the server, a preset exchange algorithm may be run, and a key corresponding to the connection is obtained by negotiation with the server. The key may be 16 bits or 32 bits.
The preset algorithm may be a DH (Diffie-Hellman) key exchange algorithm. DH is a secure protocol that allows both parties to establish a key over an insecure channel without any prior knowledge of the other party at all.
It should be noted that, in the process of obtaining the key corresponding to the connection by the terminal device and the server through the preset exchange algorithm, any method in the prior art may be adopted, and the process is not limited in the embodiment of the present invention.
And S102, receiving the MPD file sent by the server, and acquiring the time-lapse code contained in the MPD file.
When the terminal device sends an MPD acquisition request to the server and negotiates to obtain a key, the terminal device may receive an MPD file sent by the server and acquire a time-effect code included in the MPD file.
In the embodiment of the present invention, when the server sends the MPD file to the terminal device, the server may add a timeout code to the MPD file. For example, the server may generate a random code with a predetermined number of bits, such as 16 bits, 32 bits, etc., according to a preset rule, and add the random code as a time-efficient code in the MPD file. The aging code may be added in an aging-code field of the MPD file.
In one implementation, the server may always use the same nonce. Or, in another implementation manner, in order to improve the security of the multimedia content and prevent the MPD file from being intercepted by other terminal devices in the transmission process, the server may use the same one of the timelines codes for a period of time, such as 2 hours, 3 hours, 5 hours, and then replace another one of the timelines codes after the period of time elapses.
Therefore, after receiving the MPD file sent by the server, the terminal device may acquire the time-efficient code included in the MPD file for subsequent encryption operation.
S103, running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; and obtaining the multimedia fragment name obtained for the first time according to the secret key and the timeliness code, and obtaining other multimedia fragment names according to the secret key and the multimedia fragment name obtained for the last time.
After the terminal device obtains the key negotiated with the server and the aging code contained in the MPD file, a preset encryption algorithm may be run to obtain the names of the multimedia fragments in sequence. And obtaining the multimedia fragment name obtained for the first time according to the secret key and the timeliness code, and obtaining other multimedia fragment names according to the secret key and the multimedia fragment name obtained for the last time.
The preset Encryption algorithm may be a Data Encryption Standard (DES) Encryption algorithm.
For example, when the key obtained by negotiation between the terminal device and the server is K and the aging code obtained from the MPD file is a, the terminal device may run a DES encryption algorithm according to the key K and the aging code a to obtain a result B, and use B as the first multimedia segment name. Further, according to the key K and the first multimedia fragment name B, a DES encryption algorithm is run to obtain a result C, and C is used as the second multimedia fragment name. And the rest is analogized, and the following multimedia fragment names are obtained in turn.
It should be noted that, in the process of obtaining the names of the multimedia fragments by the terminal device running the preset encryption algorithm, any existing method may be adopted, and the process is not limited in the embodiment of the present invention.
S104, sequentially sending a fragment request containing the names of the multimedia fragments to the server, and receiving the index fragment and the multimedia fragment sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
In the embodiment of the invention, after the key and the ageing code are determined, the server can also run the preset encryption algorithm which is the same as that of the terminal equipment to obtain the names of the multimedia fragments. In addition, the corresponding relation between each multimedia fragment name and each multimedia fragment can be stored. And obtaining the multimedia fragment name obtained for the first time according to the secret key and the timeliness code, and obtaining other multimedia fragment names according to the secret key and the multimedia fragment name obtained for the last time.
It should be noted that the correspondence between each multimedia fragment name and each multimedia fragment stored by the server is only valid in the local connection process. After the terminal device is reconnected with the server, the terminal device needs to renegotiate the key with the server, and calculate to obtain the name of each multimedia fragment according to the time-effect code and the preset encryption algorithm. Furthermore, the corresponding relation between each multimedia fragment name and each multimedia fragment can be preserved again.
After obtaining the multimedia fragment names, the terminal device may send a fragment request including the multimedia fragment names to the server. After receiving the fragmentation request sent by the terminal device, the server can send the corresponding multimedia fragments to the terminal device according to the corresponding relationship between each multimedia fragmentation request and the multimedia fragment stored locally.
For example, the server may send the locally stored multimedia slice with the same multimedia slice name to the terminal device according to the multimedia slice name included in the slice request. Optionally, when the server does not find the multimedia fragment name included in the fragment request, it may discard the fragment request, do not process it, and disconnect the connection with the terminal device.
In addition, in order to protect the security of the tariff multimedia content, when the server sends the multimedia fragments to the terminal device, the index fragments may be added before each multimedia fragment, and the index fragments may be encrypted by using a key negotiated with the terminal device. By adding the index fragment and encrypting the index fragment, when the terminal equipment wants to acquire the multimedia fragment, the terminal equipment must decrypt the index fragment first and then acquire the multimedia fragment, so that the safety of the multimedia fragment can be protected.
The terminal device can receive the index fragment and the multimedia fragment sent by the server so as to display the tariff multimedia content according to each multimedia fragment.
The embodiment of the invention provides a multimedia content acquisition method, when a terminal device and a server are connected, the terminal device can negotiate with the server to obtain a key corresponding to the connection, the server can determine a time-effect code and send the time-effect code to the terminal device through an MPD (media distribution package) file, and then the terminal device can run a preset encryption algorithm to obtain the name of each multimedia fragment according to the key and the time-effect code. And the server can also run the preset encryption algorithm to obtain the names of the multimedia fragments according to the secret key and the time-effect code, and construct the corresponding relation between the names of the multimedia fragments and the multimedia fragments. Therefore, the terminal device may send a fragment request including the names of the multimedia fragments to the server, and obtain the corresponding index fragment and multimedia fragment sent by the server.
Because the key and the time-effect code can be obtained only by the server and the terminal equipment, the name of each multimedia fragment can be obtained only by calculation of the server and the terminal equipment, and the key is effective only in the local connection process, only the terminal equipment can obtain the corresponding multimedia fragment through the name of each multimedia fragment. Even if other terminals intercept the names of the multimedia fragments, when the other terminals send the fragment requests to the server, the server renegotiates the key with the terminal equipment, and the multimedia fragments are not directly sent to the terminal equipment. When the index fragment and the multimedia fragment sent to the terminal equipment by the server are intercepted by other terminal equipment, the terminal equipment can not normally display the multimedia content because the index fragment is encrypted, so that the safety of the tariff multimedia content can be protected.
As an implementation manner of the embodiment of the present invention, before the terminal device obtains the right to acquire the tariff multimedia content, the server may send the preset number of multimedia fragments of the tariff multimedia content to the terminal device. For example, the first multimedia fragment, the first two multimedia fragments, and the like may be sent, so that the terminal device displays the multimedia fragments sent by the server for the user to preview, and the user may further determine whether to pay to obtain the right to acquire the multimedia content, thereby improving user experience.
As shown in fig. 2, a multimedia content obtaining method provided in an embodiment of the present invention is applied to a server, and the method may include the following steps:
s201, receiving a Media Presentation Description (MPD) acquisition request sent by a terminal device, and when the requested multimedia content is the tariff multimedia content for which the terminal device has acquired the acquisition right, operating a preset exchange algorithm to negotiate with the terminal device to obtain a key corresponding to the connection.
In the embodiment of the invention, the terminal equipment can obtain the acquisition right of any tariff multimedia content. For example, the terminal device may pay the fee of the tariff multimedia content through the third party payment platform, and further obtain the acquisition right of the multimedia content.
After obtaining the right to acquire any tariff multimedia content, the terminal device may further request the tariff multimedia content from the server. Specifically, the terminal device may send a media presentation description MPD acquisition request corresponding to the tariff multimedia content to the server, so as to acquire an MPD file.
Therefore, the server may receive the MPD acquisition request transmitted by the terminal device. And, can judge whether the multimedia content of fee charging requested is the multimedia content of fee charging that the terminal installation has already obtained the authority to obtain. For example, the server may determine whether the terminal device has obtained the acquisition right of the tariff multimedia content through the encapsulation layer.
After determining that the terminal device obtains the acquisition right of the tariff multimedia content, in order to protect the security of the tariff multimedia content, the server may run a preset exchange algorithm to negotiate with the terminal device to obtain a key corresponding to the connection. The key may be 16 bits or 32 bits.
The preset algorithm may be a DH (Diffie-Hellman) key exchange algorithm. DH is a secure protocol that allows both parties to establish a key over an insecure channel without any prior knowledge of the other party at all.
It should be noted that, in the process of obtaining the key corresponding to the connection by the terminal device and the server through the preset exchange algorithm, any method in the prior art may be adopted, and the process is not limited in the embodiment of the present invention.
S202, sending the MPD file containing the timeliness code to the terminal equipment.
In this embodiment of the present invention, the server may send the MPD file to the terminal device. Moreover, a time-lapse code may also be added to the MPD file. For example, the server may generate a random code with a predetermined number of bits, such as 16 bits, 32 bits, etc., according to a preset rule, and add the random code as a time-efficient code in the MPD file. The aging code may be added in an aging-code field of the MPD file.
In one implementation, the server may always use the same nonce. Or, in another implementation manner, in order to improve the security of the multimedia content and prevent the MPD file from being intercepted by other terminal devices in the transmission process, the server may use the same one of the timelines codes for a period of time, such as 2 hours, 3 hours, 5 hours, and then replace another one of the timelines codes after the period of time elapses.
S203, operating a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; and obtaining the multimedia fragment name obtained for the first time according to the secret key and the timeliness code, and obtaining other multimedia fragment names according to the secret key and the multimedia fragment name obtained for the last time.
In the embodiment of the invention, the server can run the preset encryption algorithm to sequentially obtain the names of the multimedia fragments. And obtaining the multimedia fragment name obtained for the first time according to the secret key and the timeliness code, and obtaining other multimedia fragment names according to the secret key and the multimedia fragment name obtained for the last time.
The preset Encryption algorithm may be a Data Encryption Standard (DES) Encryption algorithm.
For example, when the key obtained by the server and the terminal device through negotiation is K and the determined aging code is a, the server may run a DES encryption algorithm according to the key K and the aging code a to obtain a result B, and use B as the first multimedia segment name. Further, according to the key K and the first multimedia fragment name B, a DES encryption algorithm is run to obtain a result C, and C is used as the second multimedia fragment name. And the rest is analogized, and the following multimedia fragment names are obtained in turn.
It should be noted that, in the process of obtaining the names of the multimedia fragments by the server running the preset encryption algorithm, any existing method may be adopted, and the process is not limited in the embodiment of the present invention.
It should be noted that the correspondence between each multimedia fragment name and each multimedia fragment stored by the server is only valid in the local connection process. After the terminal device is reconnected with the server, the terminal device needs to renegotiate the key with the server, and calculate to obtain the name of each multimedia fragment according to the time-effect code and the preset encryption algorithm. Furthermore, the corresponding relation between each multimedia fragment name and each multimedia fragment can be preserved again.
S204, constructing a corresponding relation between each multimedia fragment name and each multimedia fragment, receiving a fragment request containing the multimedia fragment name sent by the terminal equipment, and sending a corresponding index fragment and the multimedia fragment to the terminal equipment; wherein the index shard has been encrypted using the key.
After obtaining the multimedia fragment names, the server can construct the corresponding relationship between the multimedia fragment names and the multimedia fragments. For example, the server may associate a first multimedia slice name B with a first multimedia slice and a second multimedia slice name C with a second multimedia slice.
The server may receive a fragmentation request sent by the terminal device, where the fragmentation request includes any multimedia fragmentation name. Furthermore, the server can send the corresponding multimedia fragments to the terminal device according to the corresponding relationship between the multimedia fragment requests and the multimedia fragments stored locally.
For example, the server may send the locally stored multimedia slice with the same multimedia slice name to the terminal device according to the multimedia slice name included in the slice request. Optionally, when the server does not find the multimedia fragment name included in the fragment request, it may discard the fragment request, do not process it, and disconnect the connection with the terminal device.
In addition, in order to protect the security of the tariff multimedia content, when the server sends the multimedia fragments to the terminal device, the index fragments may be added before each multimedia fragment, and the index fragments may be encrypted by using a key negotiated with the terminal device.
By adding the index fragment and encrypting the index fragment, when the terminal equipment wants to acquire the multimedia fragment, the terminal equipment must decrypt the index fragment first and then acquire the multimedia fragment, so that the safety of the multimedia fragment can be protected.
The embodiment of the invention provides a multimedia content acquisition method, when a terminal device and a server are connected, the terminal device can negotiate with the server to obtain a key corresponding to the connection, the server can determine a time-effect code and send the time-effect code to the terminal device through an MPD (media distribution package) file, and then the terminal device can run a preset encryption algorithm to obtain the name of each multimedia fragment according to the key and the time-effect code. And the server can also run the preset encryption algorithm to obtain the names of the multimedia fragments according to the secret key and the time-effect code, and construct the corresponding relation between the names of the multimedia fragments and the multimedia fragments. Therefore, the terminal device may send a fragment request including the names of the multimedia fragments to the server, and obtain the corresponding index fragment and multimedia fragment sent by the server.
Because the key and the time-effect code can be obtained only by the server and the terminal equipment, the name of each multimedia fragment can be obtained only by calculation of the server and the terminal equipment, and the key is effective only in the local connection process, only the terminal equipment can obtain the corresponding multimedia fragment through the name of each multimedia fragment. Even if other terminals intercept the names of the multimedia fragments, when the other terminals send the fragment requests to the server, the server renegotiates the key with the terminal equipment, and the multimedia fragments are not directly sent to the terminal equipment. When the index fragment and the multimedia fragment sent to the terminal equipment by the server are intercepted by other terminal equipment, the terminal equipment can not normally display the multimedia content because the index fragment is encrypted, so that the safety of the tariff multimedia content can be protected.
As an implementation manner of the embodiment of the present invention, before receiving an MPD request sent by a terminal device, a server may send a preset number of multimedia segments of the tariff multimedia content to the terminal device. For example, the first multimedia fragment, the first two multimedia fragments, and the like may be sent, so that the terminal device displays the multimedia fragments sent by the server for the user to preview, and the user may further determine whether to pay to obtain the right to acquire the multimedia content, thereby improving user experience.
As an implementation manner of the embodiment of the present invention, in some cases, the tariff multimedia content is usually more and longer, and it takes a longer time for the user to view the complete tariff multimedia content. In this case, the user may view the full premium multimedia content multiple times. Also, when the user has viewed a portion of the premium multimedia content, the next time he reopens, he may want to continue viewing from where he last viewed.
Therefore, the server can locally record the corresponding relation between each terminal device identification and the sent multimedia fragment name. The terminal device identifier may be a device number, or a mobile phone number used for user registration.
When the server receives a fragment request containing a multimedia fragment name sent by the terminal device, the server can determine a part of multimedia fragments sent to the terminal device according to the correspondence between the locally stored terminal device identifiers and the sent multimedia fragment names, and sequentially send multimedia fragments which are not sent to the terminal device. Therefore, the multimedia content which is not watched can be continuously displayed for the user, repeated playing is avoided, and user experience is improved.
Corresponding to the above method embodiment, the embodiment of the present invention also provides a corresponding device embodiment.
Fig. 3 is a multimedia content obtaining apparatus provided in an embodiment of the present invention, which is applied to a terminal device, and the apparatus includes:
the executing module 310 is configured to send a Media Presentation Description (MPD) acquisition request corresponding to any tariff multimedia content to a server after acquiring an acquisition permission of the tariff multimedia content, run a preset exchange algorithm, and negotiate with the server to obtain a key corresponding to the connection;
a receiving module 320, configured to receive the MPD file sent by the server, and acquire a time-efficient code included in the MPD file;
the operation module 330 is configured to operate a preset encryption algorithm to obtain names of the multimedia fragments in sequence; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module 340 is configured to sequentially send a fragment request including names of the multimedia fragments to the server, and receive an index fragment and a multimedia fragment sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
The embodiment of the invention provides a multimedia content acquisition device, when a terminal device is connected with a server, the terminal device can negotiate with the server to obtain a key corresponding to the connection, the server can determine a time-effect code and send the time-effect code to the terminal device through an MPD (media distribution package) file, and then the terminal device can run a preset encryption algorithm to obtain the name of each multimedia fragment according to the key and the time-effect code. And the server can also run the preset encryption algorithm to obtain the names of the multimedia fragments according to the secret key and the time-effect code, and construct the corresponding relation between the names of the multimedia fragments and the multimedia fragments. Therefore, the terminal device may send a fragment request including the names of the multimedia fragments to the server, and obtain the corresponding index fragment and multimedia fragment sent by the server.
Because the key and the time-effect code can be obtained only by the server and the terminal equipment, the name of each multimedia fragment can be obtained only by calculation of the server and the terminal equipment, and the key is effective only in the local connection process, only the terminal equipment can obtain the corresponding multimedia fragment through the name of each multimedia fragment. Even if other terminals intercept the names of the multimedia fragments, when the other terminals send the fragment requests to the server, the server renegotiates the key with the terminal equipment, and the multimedia fragments are not directly sent to the terminal equipment. When the index fragment and the multimedia fragment sent to the terminal equipment by the server are intercepted by other terminal equipment, the terminal equipment can not normally display the multimedia content because the index fragment is encrypted, so that the safety of the tariff multimedia content can be protected.
As an implementation manner of the embodiment of the present invention, the apparatus further includes:
and a presentation module (not shown in the figure) configured to receive the preset number of multimedia fragments sent by the server and present the multimedia fragments.
As an implementation manner of the embodiment of the present invention, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
As shown in fig. 4, it shows a multimedia content obtaining apparatus provided in an embodiment of the present invention, applied to a server, the apparatus includes:
a receiving module 410, configured to receive a media presentation description MPD acquisition request sent by a terminal device, and when the request is a tariff multimedia content for which the terminal device has obtained an acquisition permission, run a preset exchange algorithm, and negotiate with the terminal device to obtain a key corresponding to this connection;
a first sending module 420, configured to send an MPD file including a time-efficient code to the terminal device;
the operation module 430 is configured to operate a preset encryption algorithm to obtain multimedia fragment names in sequence; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module 440 is configured to construct a correspondence between each multimedia fragment name and each multimedia fragment, receive a fragment request including a multimedia fragment name sent by the terminal device, and send a corresponding index fragment and a corresponding multimedia fragment to the terminal device; wherein the index shard has been encrypted using the key.
The embodiment of the invention provides a multimedia content acquisition device, when a terminal device is connected with a server, the terminal device can negotiate with the server to obtain a key corresponding to the connection, the server can determine a time-effect code and send the time-effect code to the terminal device through an MPD (media distribution package) file, and then the terminal device can run a preset encryption algorithm to obtain the name of each multimedia fragment according to the key and the time-effect code. And the server can also run the preset encryption algorithm to obtain the names of the multimedia fragments according to the secret key and the time-effect code, and construct the corresponding relation between the names of the multimedia fragments and the multimedia fragments. Therefore, the terminal device may send a fragment request including the names of the multimedia fragments to the server, and obtain the corresponding index fragment and multimedia fragment sent by the server.
Because the key and the time-effect code can be obtained only by the server and the terminal equipment, the name of each multimedia fragment can be obtained only by calculation of the server and the terminal equipment, and the key is effective only in the local connection process, only the terminal equipment can obtain the corresponding multimedia fragment through the name of each multimedia fragment. Even if other terminals intercept the names of the multimedia fragments, when the other terminals send the fragment requests to the server, the server renegotiates the key with the terminal equipment, and the multimedia fragments are not directly sent to the terminal equipment. When the index fragment and the multimedia fragment sent to the terminal equipment by the server are intercepted by other terminal equipment, the terminal equipment can not normally display the multimedia content because the index fragment is encrypted, so that the safety of the tariff multimedia content can be protected.
As an implementation manner of the embodiment of the present invention, the apparatus further includes:
and a second sending module (not shown in the figure) configured to send a preset number of multimedia fragments to the terminal device.
As an implementation manner of the embodiment of the present invention, the processing module 440 is specifically configured to receive a fragment request including names of the multimedia fragments sent by the terminal device, determine, according to a correspondence between locally stored identifiers of the terminal device and names of the sent multimedia fragments, a part of the multimedia fragments of the tariff multimedia content that have been sent to the terminal device, and send, in sequence, the multimedia fragments of the tariff multimedia content that have not been sent to the terminal device.
As an implementation manner of the embodiment of the present invention, the preset exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (14)
1. A multimedia content acquisition method is applied to a terminal device, and comprises the following steps:
after acquiring the authority of any tariff multimedia content, sending a Media Presentation Description (MPD) acquisition request corresponding to the tariff multimedia content to a server, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection;
receiving an MPD file sent by the server, and acquiring a time-effect code contained in the MPD file, wherein the secret key and the time-effect code can only be known by the server and the terminal equipment;
running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
sequentially sending a fragment request containing the names of the multimedia fragments to the server, and receiving the index fragment and the multimedia fragment sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
2. The method according to claim 1, wherein before sending a Media Presentation Description (MPD) acquisition request corresponding to any tariff multimedia content to a server after the acquisition right of the tariff multimedia content has been obtained, the method further comprises:
and receiving the preset number of multimedia fragments sent by the server and displaying the multimedia fragments.
3. The method according to claim 1 or 2, wherein the predetermined exchange algorithm is a diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
4. A multimedia content acquisition method applied to a server, the method comprising:
receiving a Media Presentation Description (MPD) acquisition request sent by a terminal device, and when the requested multimedia content is the tariff multimedia content of which the terminal device has acquired the acquisition permission, operating a preset exchange algorithm to negotiate with the terminal device to obtain a key corresponding to the connection;
sending an MPD file containing a time-efficient code to the terminal equipment, wherein the secret key and the time-efficient code can only be known by the server and the terminal equipment;
running a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
constructing a corresponding relation between each multimedia fragment name and each multimedia fragment, receiving a fragment request containing the multimedia fragment name sent by the terminal equipment, and sending a corresponding index fragment and the multimedia fragment to the terminal equipment; wherein the index shard has been encrypted using the key.
5. The method of claim 4, wherein before the receiving of the Media Presentation Description (MPD) acquisition request sent by the terminal device, the method further comprises:
and sending a preset number of multimedia fragments to the terminal equipment.
6. The method according to claim 4, wherein the receiving a fragmentation request containing a multimedia fragmentation name sent by the terminal device and sequentially sending corresponding index fragments and multimedia fragments to the terminal device comprises:
receiving a fragment request which is sent by the terminal equipment and contains a multimedia fragment name, determining partial multimedia fragments of the tariff multimedia content which are sent to the terminal equipment according to the corresponding relation between the locally stored terminal equipment identification and the sent multimedia fragment name, and sequentially sending multimedia fragments of the tariff multimedia content which are not sent to the terminal equipment.
7. The method according to any of claims 4-6, wherein the pre-defined exchange algorithm is the Diffie-Hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
8. A multimedia content acquisition apparatus, applied to a terminal device, the apparatus comprising:
the execution module is used for sending a Media Presentation Description (MPD) acquisition request corresponding to any tariff multimedia content to the server after the acquisition authority of the tariff multimedia content is acquired, operating a preset exchange algorithm, and negotiating with the server to obtain a key corresponding to the connection;
a receiving module, configured to receive an MPD file sent by the server, and acquire a time-efficient code included in the MPD file, where the key and the time-efficient code are only known by the server and the terminal device;
the operation module is used for operating a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module is used for sequentially sending a fragment request containing the names of the multimedia fragments to the server and receiving the index fragment and the multimedia fragments sent by the server; wherein the index shard has been encrypted using the key; and the server stores the corresponding relation between each multimedia fragment name and each multimedia fragment, and each multimedia fragment name is obtained by the server according to the secret key, the time-effect code and the preset encryption algorithm.
9. The apparatus of claim 8, further comprising:
and the display module is used for receiving the preset number of multimedia fragments sent by the server and displaying the multimedia fragments.
10. The apparatus according to claim 8 or 9, wherein the predetermined exchange algorithm is diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
11. A multimedia content acquisition apparatus, applied to a server, the apparatus comprising:
the receiving module is used for receiving a Media Presentation Description (MPD) acquisition request sent by a terminal device, and when the request is the tariff multimedia content of which the terminal device has acquired the acquisition permission, a preset exchange algorithm is operated to negotiate with the terminal device to obtain a key corresponding to the connection;
a first sending module, configured to send an MPD file including a time-efficient code to the terminal device, where the key and the time-efficient code are only known by the server and the terminal device;
the operation module is used for operating a preset encryption algorithm to sequentially obtain the names of the multimedia fragments; the first obtained multimedia fragment name is obtained according to the secret key and the timeliness code, and other multimedia fragment names are obtained according to the secret key and the last obtained multimedia fragment name;
the processing module is used for constructing the corresponding relation between each multimedia fragment name and each multimedia fragment, receiving a fragment request containing the multimedia fragment name sent by the terminal equipment, and sending the corresponding index fragment and the corresponding multimedia fragment to the terminal equipment; wherein the index shard has been encrypted using the key.
12. The apparatus of claim 11, further comprising:
and the second sending module is used for sending the preset number of multimedia fragments to the terminal equipment.
13. The apparatus according to claim 11, wherein the processing module is specifically configured to receive a fragment request that includes names of multimedia fragments and is sent by the terminal device, determine, according to a correspondence between locally stored identifiers of each terminal device and names of sent multimedia fragments, a part of multimedia fragments of the tariff multimedia content that have been sent to the terminal device, and send, in sequence, multimedia fragments of the tariff multimedia content that have not been sent to the terminal device.
14. The apparatus according to any of claims 11-13, wherein the predetermined exchange algorithm is diffie-hellman DH key exchange algorithm; the preset encryption algorithm is a data encryption standard DES encryption algorithm.
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| CN102571950B (en) * | 2011-12-31 | 2014-11-05 | 华为技术有限公司 | Media content providing and acquiring methods, server and user terminal |
| CN104320377B (en) * | 2014-09-25 | 2017-07-07 | 华为技术有限公司 | The anti-stealing link method and equipment of a kind of files in stream media |
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