CN100589553C

CN100589553C - Method for playing the interference-added TV program at the mobile phone TV terminal

Info

Publication number: CN100589553C
Application number: CN200710098237A
Authority: CN
Inventors: 罗青生
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-04-20
Filing date: 2007-04-20
Publication date: 2010-02-10
Anticipated expiration: 2027-04-20
Also published as: CN101035256A

Abstract

The invention discloses a method that cellphone TV terminal plays scrambled TV programs, comprising: according to whether the received session description protocol (SDP) file has m=data rows, streaming media platform judges whether the program the SDP file wants to play is a scrambled program stream: if yes, executing next step; key management system agent (KDA) of conditional access system generates secret key according to the received entitle management message (EMM) and entitle control message (ECM) and sends the secret key to a descrambler; the streaming media platform feeds the received scrambled TV program into the descrambler so that the descrambler decrypts the encrypted data and returns the decrypted data to video and audio decoders for decoding and playing. And the invention doesnot change the program structure of the original streaming media platform, having clear flow, easy to implement and stable. If using the same buffer memory to buffer the encrypted and decrypted videoand audio data, this can extremely raise the efficiency.

Description

A kind of mobile phone TV terminal is play the method for scrambled television program

Technical field

The present invention relates to field of mobile phone, relate in particular to the method that a kind of mobile phone TV terminal is play the scrambled television program.

Background technology

The steaming media platform of mobile phone TV terminal, it is development platform with playing stream media, usually setting up stream according to SDP (Session Description Protocol) file connects, receive RTP (real time transport protocol) data, then look, voice data parse give look, audio decoder carries out playing stream media, broadcast all be not have the audio/video flow encrypted.Streaming Media development platform (as the QTV platform of high pass) commonly used at present can not be play the audio/video flow of encryption.

Condition inserts (CA, Conditional Access) technology, is to follow DVB (Digital VideoBroadcast, digital video broadcasting) and next a kind of technology in order to the encryption and decryption Streaming Media.The technology of main flow is all followed Open Security Framework (Open Security framework).Its structure chart as shown in Figure 1, in end side, conditional access system mainly comprises KDA (KMS proxy for equipment, key management system agency), UICC (smart card), Descrambler (descrambler), wherein Descrambler carries out descrambling to the media stream of scrambling.

But this Open Security framework does not propose how to use the audio/video flow of descrambler descrambles encryption, thereby plays the TV programme of scrambling; And, need consider efficient during descrambling, problem such as stable.

Summary of the invention

The technical problem to be solved in the present invention just provides the method that a kind of mobile phone TV terminal is play the scrambled television program, realizes the audio/video flow by the descrambler descrambles encryption, thereby plays the TV programme of scrambling.

In order to solve the problems of the technologies described above, the invention provides the method that a kind of mobile phone TV terminal is play the scrambled television program, comprise the steps:

(1) steaming media platform judges according to whether having m=data capable in the Session Description Protocol SDP file that receives whether the program that this SDP file will be play is the program stream of scrambling, if, execution in step (2) then;

(2) key management system of conditional access system is acted on behalf of KDA according to the entitlement management message EMM and the Entitlement Control Message ECM that receive, produces key, sends to descrambler;

(3) steaming media platform is sent into descrambler to the scrambled television program data that receives, and descrambler utilizes described key that described scrambled television program data is carried out descrambling;

(4) steaming media platform stream medium data that descrambling is obtained is decrypted the audio, video data that obtains, and described audio, video data is sent back to the audio/video decoder broadcast of decoding.

Further, in the described step (1), if judge that the program that described SDP file will be play is the program stream of scrambling, what then identify current session broadcast is the program of scrambling.

Further, in the described step (1), if judge that the program that described SDP file will be play is the program stream of scrambling, then according to the capable IP and the port that identifies ECM stream of m=data of this SDP file; The KDA of conditional access system connects network according to the IP and the port of ECM stream, receives ECM stream.

Further, in the described step (1), steaming media platform connects network also according to the capable identification video of m=video, m=audio of SDP file, the IP and the port of audio stream, receives audio and video data streams.

Further, described method also further comprises: the audio, video data of encryption and the audio, video data after the deciphering are deposited in the same buffer memory.

The present invention does not change the original program structure of steaming media platform, and clear process is realized easily, and stable.If looking after the buffer memory of looking of encrypting, voice data and the deciphering, voice data buffer memory are same, can greatly raise the efficiency.

Description of drawings

Fig. 1 is the structural representation of Open Security framework;

The system block diagram of Fig. 2 embodiment of the invention;

Fig. 3 is an application example flow chart of the present invention.

Embodiment

In the Streaming Media development platform (as the QTV platform of high pass) commonly used at present, do not comprise Descrambler (descrambler),, need to add Descrambler (descrambler) to carry out descrambling if will play the channel of scrambling.

As shown in Figure 2, add Descrambler (descrambler),, play the scrambled television program with the steaming media platform cooperation in CAS (conditional access system) end side.If be the program of non-scrambling, then steaming media platform is worked according to normal mode, the data parsing of mobile TV chip output is come out to give look, audio decoder decode plays; If the program of scrambling, then give steaming media platform the RTP data of encrypting, steaming media platform is given descrambler data and is carried out descrambling, the stream medium data of the plaintext after the descrambling is sent back to steaming media platform, steaming media platform is resolved again, look, audio frequency is given and is looked, audio decoder decode is play.

Present embodiment comprises the steps:

Step 1, steaming media platform connect network according to the capable identification video of m=video, m=audio of SDP (Session Description Protocol) file, the IP and the port of audio stream, receive audio and video data streams.

Step 2, steaming media platform is according to the capable IP and the port that identifies ECM (EntitlementControl Message) stream of m=data of SDP file, judging the program that this SDP (Session Description Protocol) file will play simultaneously is the program stream of scrambling, and what identify that current session plays is the program of scrambling.

Wherein, step 1 and step 2 can be executed in parallel;

What common steaming media platform was play is non-encrypted audio/video flow, just can begin normal play audio/video program stream after step 1 is carried out; Common steaming media platform is in the time will playing the audio/video flow of encryption, just can not work, present embodiment is according to existing m=data capable at SDP (Session Description Protocol) file, and judging is the audio/video flow of encrypting, and what identify that current session plays is the program of scrambling.

Step 3 is a scrambled channel if judge, and KDA connects network according to the IP and the port of ECM (Entitlement ControlMessage, Entitlement Control Message) stream, receives ECM stream; KDA produces Control World (control word, i.e. key) according to EMM (Entitlement Management Message, Entitlement Management Message) that receives and ECM data, and this control word is sent into descrambler.Descrambler is in ready state, can start working.Wherein, the receiving course of EMM is IP address and the port that finds EMM according to the SDP file of EMM correspondence, just begins to connect, always in the monitoring reception data after KDA starts.

Step 4, steaming media platform is set up session connection, reception is looked, voice data, number indicate video or audio stream with different channel (channel), receive look, in the audio stream, for unencryptedly look, audio stream is directly sent into these data and is looked, audio decoder is decoded broadcast; For looking of encrypting, audio stream the enciphered data that receives is sent into descrambler, descrambler work, the data after deciphering are sent back to look, audio decoder is decoded broadcast.

In order to raise the efficiency, looking after the Buffer (buffer memory) of the looking of encryption, voice data and the deciphering, voice data Buffer are preferably same.

As described in Figure 3, be a concrete application example, comprise the steps:

Step 301, the TV player requests is play the channel that the user selects;

Step 302, multimedia platform obtain the SDP file of this channel correspondence by the mobile TV chip;

Step 303, multimedia platform are analyzed this SDP file, carry out parallel two branch's flow processs of A, B;

A branch flow process:

Step 304 is searched according to the m=data of SDP file capable;

Step 305, it is capable to judge whether to comprise m=data;

Step 306; If not comprise m=data capable, identify then that this looks, the channel of audio frequency (channel) is not for being the channel of encrypting, and finishes to carry out A branch flow process;

Step 307 if to comprise m=data capable, identifies then that this looks, the channel of the channel of audio frequency for encrypting;

Step 308, steaming media platform is the IP and the port of ECM stream according to capable the identifying of m=data of SDP file;

Step 309, the KDA of conditional access system connects network according to the IP and the port of ECM stream, receives ECM stream;

Step 310, KDA is according to receiving to such an extent that EMM and ECM data produce Control World (control word, i.e. key); Descrambler is in ready state, can start working, and finishes A branch flow process;

B branch flow process:

Step 311 is according to the capable identification video of m=video, m=audio of SDP file, the IP and the port of audio stream;

Step 312 connects network, and foundation is looked, audio frequency connects, and reception is looked, audio data stream;

Step 313 judges according to step 306,307 sign whether channel is encrypted, if do not encrypt, then execution in step 316; If encrypt, then enter next step;

Step 314 is sent into looking of encrypting, voice data descrambler and is carried out descrambling, and this step need just can be carried out after step 310 is complete;

Step 315 judges whether descrambling is successful, if not success then finishes B branch flow process; If success is then carried out next step;

Step 316, the data after the deciphering are sent back to look, audio decoder is decoded broadcasts, end B branch flow process.

The present invention can be easily based on steaming media platform, and descrambler is added in expansion, and the audio/video flow that descrambling is encrypted is in order to play the TV programme of scrambling; The present invention simultaneously guarantees the integrality of former steaming media platform, efficient stable, and method is simple, plays the scrambled television program a kind of method is provided for realize mobile phone TV terminal fast based on steaming media platform.

Claims

1. the method for a mobile phone TV terminal broadcast scrambled television program is characterized in that, comprises the steps:

(1) whether steaming media platform has m=data capable according in the Session Description Protocol SDP file that receives, judge whether the program that this SDP file will be play is the program stream of scrambling, if, then execution in step (2) is play otherwise come out to give video-audio decoder with the data parsing of chip for cell phone output;

(2) increase descrambler in the conditional access system end side, the key management system of conditional access system is acted on behalf of KDA according to the entitlement management message EMM and the Entitlement Control Message ECM that receive, produces key, sends to described descrambler;

2. method according to claim 1 is characterized in that, in the described step (1), if judge that the program that described SDP file will be play is the program stream of scrambling, what then identify current session broadcast is the program of scrambling.

3. method according to claim 1 is characterized in that, in the described step (1), if judge that the program that described SDP file will be play is the program stream of scrambling, then according to the capable IP and the port that identifies ECM stream of m=data of this SDP file; The KDA of conditional access system connects network according to the IP and the port of ECM stream, receives ECM stream.

4. method according to claim 1 is characterized in that, in the described step (1), steaming media platform connects network also according to the capable identification video of m=video, m=audio of SDP file, the IP and the port of audio stream, receives audio and video data streams.

5. method according to claim 1 is characterized in that, described method also further comprises: the audio, video data of encryption and the audio, video data after the deciphering are deposited in the same buffer memory.