JP2009159472A - Information processor, key processor, and information processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor, a key processor and an information processing method, for reducing the processing quantity on software in detecting a top transport stream packet of a section. <P>SOLUTION: A payload unit start indicator comparison part 303 of a PID filter 202 compares the payload unit start indicators of TS packets on hardware, and when the TS packet is the top TS packet of the section, a buffer control part 203 writes the top TS packet of the section in a buffer 204, and executes key processing to the following TS packets of the section. Thus, it is not necessary to repeat the section top detection processing on the software, and it is possible to reduce processing quantity on the software. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information processing device, a key processing device, and an information processing method, and in particular, an information processing device for processing broadcast data transmitted by a section composed of transport stream packets of MPEG2 (Motion Picture Experts Group 2), and key processing. The present invention relates to an apparatus and an information processing method.

  Broadcast data such as terrestrial digital broadcasting is transmitted by a section composed of a plurality of MPEG-2 compliant transport stream packets (Transport Stream Packets). In this case, the broadcast data is broadcast after being encrypted so that limited reception is possible. As an apparatus for reproducing such broadcast data, an IC card on which information necessary for key processing (descrambling processing) is recorded, a CPU, a tuner of a plurality of systems, and a key of broadcast data that has been encrypted and broadcasted A digital broadcast receiver including a descrambling unit that performs processing is known. In recent years, a format has been proposed in which broadcast data is transmitted by including information necessary for key processing in a transport stream packet of broadcast data without using an IC card.

  As an apparatus for processing such broadcast data, for example, Patent Document 1 discloses a synchronization unit that extracts data in units of transport stream packets from an input transport stream, and an input transport stream. PID filtering means for filtering packets according to PID (Packet Identifier), descrambling means for descrambling the transport stream packet subjected to PID filtering, and PID filtering and descrambled data. A digital broadcast receiver comprising section filtering means for detecting a section and filtering according to a section pattern is disclosed.

In such a system in which broadcast data is transmitted by including information necessary for key processing in a transport stream packet of broadcast data without using an IC card, the amount of information necessary for key processing included in the broadcast data increases. Not only one transport stream packet but also a plurality of transport stream packets included in one section are transmitted including information necessary for key processing. In this case, the reception side detects the first transport stream packet of one section with respect to the buffered broadcast data on software, and sequentially acquires information necessary for key processing from the first transport stream packet. Acquire and perform key processing of broadcast data.
JP 2006-54861 A

  However, in the above technique, depending on the timing at which the receiving side issues a key processing operation start command, the process of detecting the transport stream packet at the head of one section may have to be repeatedly executed. That is, for example, when an operation start command is issued immediately after the first transport stream packet of one section is transmitted in a state where a 4096-byte section is divided into 23 transport stream packets and transmitted. The receiving side performs 22 section head detection processes until the next section head transport stream packet is transmitted on the software. In such a case, the processing amount on the receiving side software increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an information processing apparatus and a key processing apparatus capable of reducing the amount of software processing when detecting a transport stream packet at the beginning of a section. And providing an information processing method.

  The present invention relates to broadcast data acquisition means for acquiring broadcast data transmitted by a section made up of MPEG2 (Motion Picture Experts Group 2) transport stream packets, and data processing means for processing broadcast data acquired by a broadcast data acquisition unit. And data reproducing / recording means for reproducing and recording broadcast data processed by the data processing means, and the data processing means detects the transport stream packet at the head of the section in the broadcast data on the hardware. The information processing apparatus includes detection means and key processing means for performing key processing on broadcast data related to a section on software in accordance with a transport stream packet at the head of the section detected by the section head detection means.

  The present invention also relates to a key processing device for performing key processing of broadcast data transmitted by a section made up of a transport stream packet of MPEG2 (Motion Picture Experts Group 2). Section head detecting means for detecting a packet on hardware, and key processing means for performing key processing on the broadcast data related to the section on software according to the transport stream packet at the head of the section detected by the section head detecting means. Key processing device.

  Further, according to the present invention, the broadcast data acquisition means acquires broadcast data transmitted by a section made up of MPEG2 (Motion Picture Experts Group 2) transport stream packets, and the data processing means acquires the broadcast data acquisition section. An information processing method for processing broadcast data, wherein a data reproduction / recording means reproduces and records the broadcast data processed by the data processing means, and a section head detection means of the data processing means The transport stream packet is detected on hardware, and the key processing means of the data processing means performs key processing on the broadcast data related to the section on the software according to the transport stream packet at the head of the section detected by the section head detecting means. This is an information processing method.

  According to the information processing device, the key processing device, and the information processing method of the present invention, it is possible to reduce the processing amount on software when detecting the transport stream packet at the head of the section.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic block diagram showing a digital tuner built-in system according to this embodiment. The digital tuner built-in system 100 of this embodiment is a system that supports reception of digital broadcasts as an information processing apparatus. As shown in FIG. 1, the digital tuner built-in system 100 of this embodiment includes a CPU 101, a host controller 102, a main memory 103, a display controller 104, a display memory 105, an I / O controller 106, a storage device 107, and an audio controller 108. A general-purpose I / O 109, a display device 111, a speaker 112, a digital tuner 121, a content protection control unit 122, and a TV antenna 131.

  The CPU 101 is a processor provided to control the digital tuner built-in system 100, and executes an OS and various programs loaded from the storage device 107 to the main memory 103. In the digital tuner built-in system 100, a television playback program is installed in advance as one of the programs. This television reproduction program is a program for reproducing broadcast data received by the digital tuner 121.

  The host controller 102 is a bridge for connecting the local bus of the CPU 101 and the I / O controller 106. The host controller 102 includes a memory controller that controls access to the main memory 103.

  The display controller 104 controls the display device 111 of the digital tuner built-in system 100. A display memory 105 is connected to the display controller 104, and data drawn in the display memory by an OS or a program is displayed on the display device 111. Video data is also written under the control of the television playback program. The display controller 104 reads data from the display memory 105 and displays it on the display device 111.

  The I / O controller 106 includes a controller for controlling the storage device 107. The I / O controller 106 also controls devices connected to the general-purpose I / F 109.

  The audio controller 21 controls the speaker 22. Audio data (PCM or the like) sent from the OS or program is converted into an electrical signal, and sound is reproduced by driving the speaker 112.

  The CPU 101, host controller 102, main memory 103, display controller 104, display memory 105, I / O controller 106, storage device 107, audio controller 108, general-purpose I / O 109, display device 111, and speaker 112 are data It functions as a reproducing / recording means.

  The digital tuner 121 is a device for receiving broadcast data such as a digital broadcast television program, and receives broadcast data of a channel number designated by a command from the television reproduction program. A TV antenna 131 is connected to the digital tuner 121. The digital tuner 121 demodulates the received broadcast data and generates a transport stream packet (hereinafter referred to as a TS packet) in the MPEG2-TS format. The digital tuner 121 functions as broadcast data acquisition means.

  The content protection control unit 122 receives the TS packet output from the digital tuner 121, performs key processing (descrambling), which is decryption processing of the TS packet, using key data generated from the input TS packet, and is unnecessary. After filtering the TS packet, encryption processing (local encryption) is performed again and the result is written in the main memory 103. The content protection control unit 122 functions as a data processing unit.

  Note that the above-described television playback program decrypts the encrypted TS packet stored in the main memory 103 and separates it into additional information such as video / audio / data broadcast. If it is an image, the separated image data is decoded to generate display image data and write it to the display memory 105. If it is sound, the separated sound data is decoded to generate sound data for reproduction, and is sent to the audio controller 108. If it is data broadcast data, the data is analyzed, display data is generated, and written into the display memory 105.

  FIG. 2 is a block diagram showing a system configuration of the content protection control unit 122 of FIG. As shown in FIG. 2, the content protection control unit 122 includes a descrambler 201, a PID filter 202, a buffer control unit 203, a buffer 204, an encryption processing unit 205, a host I / F 206, a tuner I / F 207, and a microcomputer 208. ing.

  The descrambler 201 performs decryption processing of the encrypted TS packet using key data generated by the microcomputer 208 from the input TS packet on the software. The descrambler 201 receives the TS packet encrypted from the digital tuner 121 on the software, and outputs the decrypted TS packet to the PID filter 202. The operation setting of the descrambler 201 is performed by the microcomputer 208.

  The PID filter 202 compares the PID (Packet Identifier) of TS packets input from the descrambler 201 on the hardware, and filters unnecessary TS packets. The PID filter 202 outputs the TS packet for generating key data to the buffer control unit 203 and outputs the TS packet output to the host I / F 206 to the encryption processing unit 205 on the hardware. The operation setting of the PID filter 202 is performed by the microcomputer 208.

  The buffer control unit 203 performs control to store the TS packet output from the PID filter 202 in the buffer 204. The buffer control unit 203 is controlled by the command shown in FIG. 5 from the microcomputer 208, and performs the operation shown in the state transition diagram of FIG. In this embodiment, the buffer control unit 203 also receives a payload unit start indicator comparison result output from the PID filter 202.

  The buffer 204 is for storing TS packets output from the buffer control unit 203. In this embodiment, a buffer 204 capable of storing all TS packets for a maximum size of 4096 bytes in one section is installed. The microcomputer 208 generates key data to be set in the descrambler 201 from the TS packet stored in the buffer 204.

  The encryption processing unit 205 is for performing encryption processing (local encryption) again on the TS packets filtered by the PID filter 202.

  The host I / F 206 is a circuit that outputs the TS packet output from the encryption processing unit 205 to the host I / F 206, converts the TS packet to the timing of the host I / F 206, and outputs the data to the I / O controller 106. . Output data is written to the main memory 103.

  The tuner I / F 207 is for converting the channel setting command from the microcomputer 208 into the timing of the digital tuner 121 and outputting it.

  The microcomputer 208 performs processing for generating key data to be set in the descrambler 201 from one section of the TS packet stored in the buffer 204. In addition, the microcomputer 208 performs operation settings of the descrambler 201, the PID filter 202, the buffer processing unit 203, the encryption processing unit 205, and the tuner I / F 207.

  The descrambler 201, the buffer control unit 203, the buffer 204, and the microcomputer 208 described above function as a key processing unit. The PID filter 202 functions as section head detection means.

  FIG. 3 is a block diagram showing a system configuration of the PID filter 202 of FIG. As shown in FIG. 3, the PID filter 202 includes an internal buffer output PID filter 301, a host I / F output PID filter 302, and a payload unit start indicator comparison unit 303.

  The internal buffer output PID filter 301 includes a PID table 301a and a PID comparison unit 301b. A value set by the microcomputer 208 is written in the PID table 301a. The PID comparison unit 301b compares the value in the PID table 301a with the PID of the TS packet input from the descrambler 201, and outputs only the TS packet with the matching value to the buffer control unit 203.

  The host I / F output PID filter 302 includes a PID table 302a and a PID comparison unit 302b. A value set by the microcomputer 208 is written in the PID table 302a. The PID comparison unit 302b compares the value in the PID table 302a with the PID of the TS packet input from the descrambler 201, and outputs only the TS packet whose value matches to the encryption processing unit 205.

  The payload unit start indicator comparison unit 303 sets “1” when a payload unit start indicator of a TS packet (described later) input from the descrambler 201 is “1”, otherwise sets “0” to the buffer control unit 203 and the microcomputer. To 208.

  4A to 4C are diagrams showing the data structures of sections, transport streams, and packet headers in MPEG2, respectively. As shown in FIGS. 4A and 4B, the section is data having a maximum length of 4096 bytes, and information for generating key data used in program information, data broadcasting data, and TS packet decryption processing (descrambling). Stored. The section is transmitted after being divided into payload portions of TS packets. For example, in the case of a 4096-byte section, it is divided into 23 TS packets (4096 bytes / 184 bytes = 22.26≈23) and transmitted. In addition, the same information is transmitted at regular intervals as information for generating key data used in the TS packet decryption process (descrambling).

  As shown in FIG. 4B, the TS packet is data having a fixed length of 188 bytes, the head 4 bytes (32 bits) is a packet header, and the remaining 184 bytes are a payload and an adaptation field.

  As shown in FIG. 4C, the packet header includes a synchronization byte (8 bits, data is 0 × 47) indicating the head of the packet, and a payload unit start indicator (1 bit) indicating that the head data such as a section is included. , PID (13 bits) that is packet identification information.

  Hereinafter, operations of the PID filter 202 and the buffer control unit 203 in the digital tuner built-in system 100 of the present embodiment will be described. FIG. 6 is a state transition diagram showing the operation of the state machine inside the buffer control unit 203. FIG. 5 shows commands for the microcomputer 208 to control the buffer control unit 203.

  As shown in FIG. 6, the IDLE state S101 is a state indicating that the operation of the buffer control unit 203 is stopped. When the operation start command 11 is issued from the microcomputer 208, the IDLE state S101 transitions to the section head detection state S102.

  The section head detection state S102 is a state indicating that an operation start command is issued from the microcomputer 208 and that input of a TS packet including the head of the section is awaiting input. The section head detection state S102 transits to the buffer write state S103 when the comparison result of the payload unit start indicator output from the payload unit start indicator comparison unit 303 of the PID filter 202 is “1”. When the operation stop command 10 is issued from the microcomputer 208, the microcomputer transitions to the IDLE state and stops the operation.

  The buffer write state S103 is a state indicating that the buffer control unit 203 is writing a TS packet to the buffer 204. The buffer write state S103 transitions to the TS packet head detection state S104 when the writing of all the TS packets 188 bytes is completed. When the operation stop command 10 is issued from the microcomputer 208, the buffer write state S103 transitions to the IDLE state S101 and stops its operation.

  The TS packet head detection state S104 is a state of waiting for input of TS packets after the second section of the section divided into the payload of the TS packet. When the TS packet is output from the PID filter 202, the TS packet head detection state S104 transitions to the buffer write state S103. When an operation stop command is issued from the microcomputer 208, the TS packet head detection state S104 transitions to the IDLE state S101 and stops operating.

  FIG. 7 is a flowchart showing a procedure for detecting the head of a conventional section. As shown in FIG. 7, conventionally, the microcomputer issues an operation start command to the buffer control unit (S201). After one TS packet is written in the buffer (S202), if the TS packet at the head of the section has been processed, the process proceeds to a process for generating descrambler key data (S205).

  On the other hand, when the TS packet at the head of the section has not been processed (S203), the process proceeds to the transport start indicator determination process of the TS packet header (S204). When the transport start indicator in the packet header of the TS packet stored in the buffer is read and the transport start indicator is “1”, the TS packet written in the buffer is the TS packet at the head of the section. The processing proceeds to descrambler key data generation processing (S205). When the transport start indicator is “0”, since the TS packet written in the buffer is not the TS packet at the head of the section, the next one TS packet is written in the buffer (S202), and the transport start indicator is Until the TS packet at the head of the section “1” is detected, the processes of S202 to S204 are repeated.

  If all the sections have not been processed (S206), the next TS packet is written into the buffer (S202), and the processes of S202 to S205 are repeated.

  The processing after the TS packet of S202 of FIG. 7 is written into the buffer can be classified into the section head detection processing of S202 to S204 and the descrambler key data generation processing of S202 to S206. Here, in the section head detection process, for example, as in the present embodiment, a 4096-byte section is transmitted after being divided into 23 transport stream packets, and the first TS packet of one section is transmitted. When the operation start command is issued immediately after the reception, the receiving side performs 22 section head detection processes until the next section head transport stream packet is transmitted on the software. . In such a case, the processing amount on the receiving side software increases.

  Therefore, in this embodiment, the payload unit start indicator comparison unit 303 of the PID filter 202 compares the payload unit start indicator of the TS packet on hardware, and only when the TS packet is the first TS packet of the section, The buffer control unit 203 writes the first TS packet of the section in the buffer 204 and performs key processing on the TS packets after the section. For this reason, unlike the conventional method shown in FIG. 7, the section head detection process is not repeated on the software, so that the processing amount on the software can be reduced.

  In the present embodiment, the payload unit start indicator comparison unit 303, which is hardware that performs section head detection processing, is mounted on the PID filter 202, and the section head detection processing is executed simultaneously with the PID filtering processing, thereby adding an additional circuit. There is an advantage that there is no delay in operation due to.

  Furthermore, in the present embodiment, a circuit that analyzes the TS packet header used in the PID filter 202 by mounting the payload unit start indicator comparison unit 303, which is hardware that performs section head detection processing, in the PID filter 202. There is an advantage that the section head detection processing by hardware can be realized only by adding a small circuit.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

It is a schematic block diagram which shows the digital tuner built-in system which concerns on this embodiment. It is a block diagram which shows the system configuration | structure of the content protection control part of FIG. It is a block diagram which shows the system configuration | structure of the PID filter of FIG. (A)-(c) is a figure which shows the data structure of the section in MPEG2, a transport stream, and a packet header, respectively. It is a table | surface which shows the list of the control command of a buffer control part. It is a state machine state transition diagram of the buffer control unit. It is a flowchart which shows the procedure which detects the head of the conventional section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Digital tuner built-in system, 101 ... CPU, 102 ... Host controller, 103 ... Main memory, 104 ... Display controller, 105 ... Display memory, 106 ... I / O controller, 107 ... Storage device, 108 ... Audio controller, 109 ... General purpose I / F, 111 ... Display device, 112 ... Speaker, 121 ... Digital tuner, 122 ... Content protection control unit, 131 ... TV antenna, 201 ... Descrambler, 202 ... PID filter, 203 ... Buffer control unit, 204 ... Buffer 205: Encryption processing unit 206 206 Host I / F 207 Tuner I / F 208 Microcomputer 301 Internal PID filter for output buffer 301a PID table 301b PID comparison unit 302 Host I / F output PID file Motor, 302a ... PID table, 302b ... PID comparison unit 303 ... payload unit start indicator comparing unit.

Claims (6)

Broadcast data acquisition means for acquiring broadcast data transmitted by a section composed of transport stream packets of MPEG2 (Motion Picture Experts Group 2);
Data processing means for processing the broadcast data acquired by the broadcast data acquisition unit;
Data reproduction / recording means for reproducing and recording the broadcast data processed by the data processing means;
With
The data processing means includes
Section head detection means for detecting the transport stream packet at the head of the section in the broadcast data on hardware;
In accordance with the transport stream packet at the head of the section detected by the section head detection means, key processing means for performing key processing on the broadcast data related to the section on software,
An information processing apparatus.   The hardware of the section head detection means is mounted on a PID filter that filters the transport stream packet according to a PID (Packet Identifier), and simultaneously with the filtering process of the PID filter, the section head of the section in the broadcast data The information processing apparatus according to claim 1, wherein the information processing apparatus detects a transport stream packet. A key processing device that performs key processing of broadcast data transmitted by a section composed of transport stream packets of MPEG2 (Motion Picture Experts Group 2),
Section head detection means for detecting the transport stream packet at the head of the section in the broadcast data on hardware;
In accordance with the transport stream packet at the head of the section detected by the section head detection means, key processing means for performing key processing on the broadcast data related to the section on software,
A key processing device.   The hardware of the section head detection means is mounted on a PID filter that filters the transport stream packet according to a PID (Packet Identifier), and simultaneously with the filtering process of the PID filter, the section head of the section in the broadcast data The key processing device according to claim 3, wherein the key processing device detects a transport stream packet. Broadcast data acquisition means acquires broadcast data transmitted by a section composed of transport stream packets of MPEG2 (Motion Picture Experts Group 2),
Data processing means processes the broadcast data acquired by the broadcast data acquisition unit,
A data reproduction / recording means is an information processing method for reproducing and recording the broadcast data processed by the data processing means,
The section head detecting means of the data processing means detects the transport stream packet at the head of the section in the broadcast data on hardware,
The information processing method, wherein the key processing means of the data processing means performs key processing on the broadcast data related to the section on software according to the transport stream packet at the head of the section detected by the section head detection means.   The hardware of the section head detection means is mounted on a PID filter that filters the transport stream packet according to a PID (Packet Identifier), and simultaneously with the filtering process of the PID filter, the section head of the section in the broadcast data The information processing method according to claim 5, wherein a transport stream packet is detected.

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