JP2011004274A - Data processing apparatus and method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a data processing apparatus for changing to a transport stream in which character display is added to OSD by adding a character stream to the transport stream and changing attribute information for OSD displaying the character stream.SOLUTION: The data processing apparatus 1 includes: a receiving unit 110 for receiving a transport stream signal S11 through a communication network 4; a generation unit 123 for generating the character stream S20; a change unit 122 for changing PMT on the basis of the character stream S20; an insertion unit 124 for generating a TS packet group S15 including the character stream S20 by inserting the character stream S20 to the TS packet group S12; and a transmission unit 140 for output of the transport stream signal S16 to a display device 3 for displaying broadcast data.

Description

  The present invention relates to a data processing device, a data processing method, and a program in a transport stream that is a transmission standard in broadcast communication.

  In a communication standard using a transport stream such as digital broadcasting, a subtitle stream and section data are added to a broadcast signal in addition to broadcast data. These broadcast data and system data are displayed on the screen by an OSD (On Screen Display) display, and the user can watch the broadcast and operate the OSD.

  Patent Document 1 below discloses a technique in which an OSD display that has received a transport stream controls the displayed OSD. Since the OSD display uses a markup language for the description of the data content, it is possible to display the data content on the OSD without requiring decoding of the video data.

Japanese Patent No. 3790761

  A payload, which is a transmission data storage area of a TS (Transport Stream) packet, is scrambled at the transmission stage, and the transport stream is not created on the premise that the transport stream is changed or added during transmission. Therefore, in order to change the subtitle stream and section data included in the payload, it is necessary to release the scramble once applied to the transport stream. Therefore, changing the data such as adding characters to the OSD display is troublesome.

  An object of the present invention is to add a character stream to a transport stream and change attribute information for OSD display of the character stream, thereby changing the data to a transport stream in which character display is added to the OSD. A processing apparatus, a data processing method, and a program are provided.

  A data processing apparatus according to a first aspect of the present invention communicates a first transport stream including a plurality of packets storing broadcast data and a packet storing attribute information of each of the plurality of packets. Receiving means for receiving via a network; generating means for generating a character stream; changing means for changing the attribute information based on the character stream; and inserting the character stream into the first transport stream In this way, it is characterized by comprising insertion means for generating a second transport stream and output means for outputting the second transport stream to a display means for displaying the broadcast data.

  According to the data processing device of the first aspect, a character stream is added to the first transport stream, and the attribute information for OSD display of the character stream is changed, whereby the second transport The display means that has received the stream can display the added characters.

  In the data processing device according to the second aspect of the present invention, in particular in the data processing device according to the first aspect, the insertion means stores the character stream in a packet, and the packet and the first transport stream The second transport stream is generated by replacing the null packet.

  According to the data processing device according to the second aspect, since the character stream to be added is replaced with a null packet that is originally transmitted, the character stream can be added without deteriorating the transmission efficiency of the transport stream. Is possible. Further, since the number of packets to be transmitted does not change even if a character stream is added, it is not necessary to adjust the number of packets for the transport stream clock recovery function.

  In the data processing device according to the third aspect of the present invention, in the data processing device according to the first or second aspect, the attribute information portion is scrambled in the first transport stream. In addition, it is characterized in that portions other than the attribute information are scrambled.

  According to the data processing device according to the third aspect, since the broadcast data of the part other than the attribute information is scrambled, viewing contrary to the intention of the broadcast data transmission source can be prevented. Furthermore, since the attribute information portion is not scrambled, it is not necessary to execute the descrambling process when changing the attribute information.

  A data processing method according to a fourth aspect of the present invention provides: (A) a first transport stream including a plurality of packets storing broadcast data and a packet storing attribute information of each of the plurality of packets. (B) generating a character stream; (C) changing the attribute information based on the character stream; and (D) the first transformer. Generating a second transport stream by inserting the character stream into a port stream; and (E) outputting the second transport stream to display means for displaying the broadcast data. It is characterized by comprising.

  According to the data processing method of the fourth aspect, by adding a character stream to the first transport stream and changing attribute information for OSD display of the character stream, the second transport The display means that receives the stream can easily display the added character.

  A program according to a fifth aspect of the present invention is a program for causing a computer to process broadcast data. The computer includes (A) a plurality of packets in which broadcast data is stored, and each of the plurality of packets. Receiving a first transport stream including a packet in which attribute information is stored via a communication network; (B) generating a character stream; and (C) based on the character stream, Changing attribute information; (D) generating a second transport stream by inserting the character stream into the first transport stream; and (E) the second transport stream. Outputting to the display means for displaying the broadcast data. It is characterized in.

  According to the program according to the fifth aspect, the display is performed by causing the computer to add a character stream to the first transport stream and further change the attribute information for OSD display of the character stream. By the means, it is possible to obtain a second transport stream in which characters can be additionally displayed.

  According to the present invention, a character stream is added to a transport stream, and the attribute information for OSD display of the character stream is changed to change to a transport stream in which character display is added to the OSD. Is possible.

1 is a block diagram showing an overall configuration of a communication system using a data processing device according to an embodiment of the present invention. It is a block diagram which shows the structure of the data processor which concerns on embodiment of this invention. It is a functional block diagram which shows the function implement | achieved in a signal processing part by running a program. It is a flowchart which shows operation | movement of a data processor. It is a figure regarding the content data of TS packet and PES packet. It is the figure which showed the data structure example of synchronous PES. It is the figure which showed the data structure example of asynchronous type PES. It is the figure which showed the example of the setting parameter of the PES packet in a caption. It is the figure which showed the example of the setting parameter of the PES packet in a character superimposition. It is the figure which showed the example of the data parameter of the data group of a caption. It is the figure which showed the example of the structure of PMT to change. It is the figure which showed the allocation of the stream type described in PMT. It is the comparison figure typically expressed regarding the multiplexing of a stream. It is a block diagram which shows the structure of the Example of this invention. It is a functional block diagram of HGW concerning the example of the present invention. It is the figure which showed the example of the parameter of the caption management data in a caption. It is the figure which showed the example of the parameter of the caption management data in a character superimposition.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a block diagram showing an overall configuration of a communication system using a data processing device 1 according to an embodiment of the present invention. As shown in FIG. 1, the communication system includes a data transmission device 2 (such as an IP broadcast station or a VOD server) that transmits broadcast data, and data processing connected to the data transmission device 2 via a communication network 4 such as an IP network. The apparatus 1 includes a display device 3 such as a television connected to the data processing device 1. However, the data processing device 1 may be built in the display device 3. The data processing device 1 relays broadcast data between the data transmission device 2 and the display device 3, and adds new information to the broadcast data received from the data transmission device 2, as will be described in detail later. It is possible.

  FIG. 2 is a block diagram showing the configuration of the data processing apparatus 1 according to the embodiment of the present invention. The data processing apparatus 1 includes a receiving unit 110, a signal processing unit 120 such as a CPU, a storage unit 130 such as a semiconductor memory, and a transmission unit 140. An input to the data processing device 1 is connected to an input of the receiving unit 110. An output from the receiving unit 110 is connected to an input of the signal processing unit 120. The output of the signal processing unit 120 is connected to the input of the storage unit 130 and the input of the transmission unit 140. The output of the storage unit 130 is connected to the input of the signal processing unit 120. The output of the transmission unit 140 is the output of the data processing device 1.

The data processing device 1 according to the embodiment of the present invention is a computer device, and the signal processing unit 120 reads the program 135 stored in the storage unit 130 and executes the program 135, thereby realizing the functions of the present invention. be able to. When the transport stream signal S11 from the communication network 4 is input to the receiving unit 110, the transport stream signal S11 is input to the signal processing unit 120 and written to the storage unit 130. Then, the signal processing unit 120 reads the program 135 from the storage unit 130, and processes the transport stream signal S11 read from the storage unit 130 in accordance with instructions of the program 135. (Hereinafter, the same applies even when the reading and execution of the program are not specifically described.)

  FIG. 3 is a functional block diagram illustrating functions implemented in the signal processing unit 120 by executing the program 135. In the function that the program 135 is realized by the signal processing unit 120, the input to the signal processing unit 120 is the input to the extraction unit 121 and the insertion unit 124. The output of the extraction unit 121 becomes the input of the change unit 122. The output of the changing unit 122 becomes the input of the inserting unit 124. The output of the generation unit 123 is input to the insertion unit 124 and the change unit 122. The output of the insertion unit 124 becomes the output of the signal processing unit 120.

  Next, the operation of the data processing apparatus 1 according to the embodiment of the present invention will be described using the flowchart of FIG. A data processing apparatus 1 according to an embodiment of the present invention is an apparatus that relays transport stream communication, and a transport stream signal S11 is input to the data processing apparatus 1. The transport stream signal S11 includes a packet including moving image data, a packet including audio data, a packet including section data, a null packet, a packet including attribute information of a transport stream called PMT (Program Map Table), and the like. have. FIG. 5 schematically shows a packet included in the transport. As shown in FIG. 5, PES (Packetized Elementary Stream) packets can be stored in the payload, which is the data storage area of the transport stream. The transport stream also has a packet including section data that cannot be attached to the PES.

  First, in step SP100, the transport stream signal S11 transmitted by packet communication is input to the receiving unit 110. The receiving unit 110 recognizes the transport stream signal S11 as a plurality of TS packets and outputs it as a TS packet group S12.

  Next, in step SP200, the extraction unit 121 searches for a packet including the PMT from the TS packet group S12, and extracts PMT information. The extracted PMT information is sent to the changing unit 122 as a PMT information signal S17.

  Next, in step SP300, the generation unit 123 generates a character stream in the PES data format including character information displayed on the OSD, and outputs the character stream as a character stream S20. Further, stream information S20 of the generated character stream is output. Examples of the PES data structure of the character stream at this time are shown in FIGS. FIG. 6 shows the data structure of a synchronous PES, and FIG. 7 shows the data structure of an asynchronous PES. Furthermore, FIG. 8 shows an example of setting parameters for PES packets in subtitles, and FIG. 9 shows an example of setting parameters for PES packets in character superimposing. FIG. 10 shows an example of data parameters in the data of the caption data group shown in FIGS.

Next, in step SP400, the stream information S18 output from the generation unit 123 is input to the change unit 122. Then, the changing unit 122 changes the PMT information received from the extracting unit 121 based on the stream information S18. An example of the structure of the PMT information to be changed is shown in FIG. FIG. 12 shows the assignment of stream types described in the PMT information. When changing the PMT information, the changing unit 122 changes the PI of the character stream.
D (Packet Identification) is added, a CRC (Cyclic Redundancy Check) corresponding to the PMT for which information has been added is generated, and this is rewritten. Thereafter, the changing unit 122 outputs the new PMT information S19 that has been changed.

  Next, in step SP500, the new PMT information S19 output from the changing unit 122 is input to the inserting unit 124. The character stream S20 generated by the generation unit 123 is also input to the insertion unit 124. The insertion unit 124 inserts the changed PMT information into a packet that includes the original PMT extracted by the extraction unit 121 in the TS packet group S12, and rewrites the new PMT information. Further, the insertion unit 124 adds the character stream S20 to the TS packet group S12 and outputs it as a new TS packet group S15.

  The transmission unit 140 that has received the new TS packet group S15 from the insertion unit 124 performs packet transmission processing and outputs the packet as a transport stream signal S16. This transport stream signal S16 becomes the output of the data processing device 1.

  When the transport stream to which the character stream output from the data processing device 1 is added is input to the OSD display, first, the PAT (Program Association Table) of the transport stream is read, and the PMT described in the PAT is read. PMT is called by the PID of Since the changing unit 122 of the data processing apparatus 1 does not change the PID information of the PMT itself, the OSD display can read the newly inserted PMT information in the same manner as the original transport stream.

  Next, the OSD display calls each broadcast data by the PID of the broadcast data described in the PMT information. At this time, since the PID of the character stream added in the present invention is also called, the OSD display can read the character stream newly added by the data processing apparatus 1 and display it on the OSD.

  As described above, according to the data processing device 1 according to the embodiment of the present invention, a new character stream can be added to a received transport stream before executing a decoding process. Furthermore, the character stream can be displayed on the OSD display without changing the BML (Broadcast Markup Language) file in which the control information of the OSD display of the transport stream is described.

<First Modification>
According to the data processing device 1 according to the first modification, when the insertion unit 124 inserts the character stream into the TS packet group S12 in step SP500, the TS packet group S12 is not multiplexed but the streams are multiplexed. The null packet payload and the PES packet data of the character stream are replaced. FIG. 13 schematically shows TS packets when a general stream is multiplexed and when it is replaced with a null packet and inserted. In FIG. 13, the header part of the TS packet is omitted.

  In general multiplexing between streams, packets are multiplexed in order, so the amount of transmission data increases compared to before adding a stream, whereas when replacing with a null packet and inserting, adding a stream The amount of transmission data is the same as before, and a stream can be added without causing deterioration in transmission efficiency.

In transport stream communication, a clock recovery function is used to synchronize the clock on the transmission side and the clock on the reception side. At this time, if general streams are multiplexed, the number of packets in the stream changes, so in order to correctly recover the clock, it is necessary to adjust the number of packets again to achieve synchronization. However, if the first modified example of the present invention is used, the number of packets to be transmitted does not change before and after data insertion, so there is no need to make adjustments for clock recovery again.

<Second Modification>
According to the data processing device 1 according to the second modification, the broadcast data of the transport stream signal S11 is scrambled, but the PMT is not scrambled. Therefore, the extracting unit 121 can extract PMT information without performing complicated processing such as descrambling, and the inserting unit 124 can also insert new PMT information S19.

  The scramble here is to make broadcast data complicated (rearrangement of bit arrangement, encryption, etc.) in order to prevent unintentional viewing on the broadcast transmission side. The scrambled broadcast data cannot be read as it is. Therefore, in order to process the scrambled broadcast data, it is necessary to release the scramble. However, in the second modification of the present invention, it is not necessary to release scramble when adding display characters to the transport stream.

<Third Modification>
FIG. 14 is a block diagram showing a third modification of the present invention. When watching digital TV at home, a broadcast signal sent from the broadcast network 400 is terminated by an HGW (Home Gateway) 500 and connected to each digital TV 300a, 300b, 300c. ) Transport stream signals are distributed to 200a, 200b, and 200c. Although FIG. 14 distributes three signals to three digital televisions, it is merely an example, and the number of distributions and the number of digital televisions are not limited in the present invention.

  Here, description will be given using the case of the STB 200a and the digital television 300a. When the STB 200a decodes the transport stream signal distributed by the HGW 500, the broadcast transmitted by the transport stream can be viewed on the digital television 300a.

  At this time, when an abnormality is detected by the security sensor 600 installed in the home, an abnormality detection signal is sent to the HGW 500. The data processing apparatus 1 according to the embodiment of the present invention is mounted on the HGW 500, and an abnormality detection signal from the security sensor 600 is input to the generation unit 123. FIG. 15 shows a functional block diagram of the HGW.

  The generation unit 123 to which the abnormality detection signal is input generates a character stream including a sentence “A security sensor has detected an abnormality”, and the data processing apparatus 1 converts the character stream informing the abnormality into a transport stream. to add. At this time, the display mode is set in the items of TMD (Time control Mode) and DMF (Display Mode Flag) in the PES data group of the character stream. FIG. 16 shows the PES parameters of the caption management data in the caption, and FIG. 17 shows the PES parameters of the caption management data in the character superimposing. Here, since automatic display is performed in real time, TMD in FIG. 17 is set to “01”, and DMF is set to “0000”.

The transport stream to which the character stream is added is decoded by the STB 200a in the same manner as the transport stream for performing normal broadcasting, and is received by the digital television 300a. At this time, the digital television reads the PES data of the character stream and operates the OSD so as to automatically display in real time. In this way, the character “security sensor has detected an abnormality” added by the character stream is also displayed on the digital television 300a, so that the viewer of the digital television 300a knows that the security sensor 600 has detected the abnormality. It is possible.

  In the third modification, the case where the HGW 500 is mounted with the data processing device 1 according to the embodiment of the present invention is illustrated, but the present invention is a device on which the data processing device 1 according to the embodiment is to be mounted. It is not intended to be limited. Furthermore, in FIG. 14, even when the data processing apparatus 1 is mounted on the STB 200a, STB 200b, and STB 200c, the same effect can be obtained.

  The application example of the present invention is not limited to the security sensor, and can be used for detecting a fire by a fire alarm or notifying a visitor by an intercom.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

DESCRIPTION OF SYMBOLS 1 Data processing apparatus 3 Display apparatus 4 Communication network 110 Reception part 120 Signal processing part 121 Extraction part 122 Change part 123 Generation part 124 Insertion part 130 Storage part 135 Program 140 Transmission part 200a, 200b, 200c STB
300a, 300b, 300c Digital TV 400 Broadcast network 500 HGW
600 Security sensor

Claims (5)

Receiving means for receiving, via a communication network, a first transport stream including a plurality of packets in which broadcast data is stored and a packet in which attribute information of each of the plurality of packets is stored;
Generating means for generating a character stream;
Changing means for changing the attribute information based on the character stream;
Inserting means for generating a second transport stream by inserting the character stream into the first transport stream;
A data processing apparatus comprising: output means for outputting the second transport stream to display means for displaying the broadcast data.   The said insertion means stores the said character stream in a packet, The said 2nd transport stream is produced | generated by replacing the said packet and the null packet of a said 1st transport stream. Data processing equipment.   3. The data processing device according to claim 1, wherein, in the first transport stream, the attribute information portion is not scrambled, and a portion other than the attribute information is scrambled. 4. . (A) receiving a first transport stream including a plurality of packets storing broadcast data and a packet storing attribute information of each of the plurality of packets via a communication network;
(B) generating a character stream;
(C) changing the attribute information based on the character stream;
(D) generating a second transport stream by inserting the character stream into the first transport stream;
(E) A data processing method comprising: outputting the second transport stream to display means for displaying the broadcast data. A program for causing a computer to process broadcast data,
In the computer,
(A) receiving a first transport stream including a plurality of packets storing broadcast data and a packet storing attribute information of each of the plurality of packets via a communication network;
(B) generating a character stream;
(C) changing the attribute information based on the character stream;
(D) generating a second transport stream by inserting the character stream into the first transport stream;
(E) A program for executing the step of outputting the second transport stream to display means for displaying the broadcast data.

Images