JP6744262B2 - Electronic device and method - Google Patents

Description

Embodiments of the present invention relate to electronic devices and methods.

In the current broadcasting system, for example, a media transport method called MPEG-2 TS (Moving Picture Experts Group-2 Transport Stream) is widely used. MPEG-2 TS is one of the data formats for transmitting and receiving data encoded by the MPEG-2 system, etc., and handles various formats of data such as video, audio, still images, and characters collectively. Is possible.

However, since the MPEG-2 TS system is premised on a single transmission line called broadcasting, there is a limit to the services that can be provided.

Therefore, in recent years, a method called MMT (MPEG Media Transport) has been proposed in place of MPEG-2 TS. According to the MMT method, data can be transmitted and received through a plurality of transmission paths such as broadcasting and communication, and thus it is expected to provide a high-level service in which the broadcasting and communication are linked.

ARIB STD-B32 3.9 version Video coding, audio coding and multiplexing method for digital broadcasting General Incorporated Association ARIB TR-B39 1.1 version Advanced broadband satellite digital broadcasting operational regulations General Incorporated Association

However, when a program (program) is recorded from a broadcast wave transmitted in a broadcasting system adopting the MMT method, the program is efficiently read (reproduced) as compared with the case of using the MPEG-2 TS method. May not be possible.

Therefore, an object of the present invention is to provide an electronic device and method capable of efficiently reading a recorded program in a broadcasting system adopting the MMT method.

The electronic device according to the embodiment includes a receiving unit and a recording unit. The receiving unit receives a broadcast wave including the first program according to the MMT (MPEG Media Transport) method. The recording unit generates an Entry Point MAP indicating at least the position of the I frame of the first program, and records a broadcast wave stream including the first program according to a variable length packet method of TLV (Type Length Value). To record. The recording unit records a first TLV packet of the first program in at least a part of a first read block of the recording medium, and records a second TLV packet next to the first TLV packet in the first read block. Recording is performed in the recording area on the recording medium starting from the beginning of the second read block next to. If the second TLV packet is designated by the Entry Point MAP and the end of the first TLV packet does not match the end of the first read block, the end of the first TLV packet starts from the end of the second read block. Up to the recording area on the recording medium.

FIG. 6 is a diagram showing an example of a configuration of an electronic device according to an embodiment. The figure which shows an example of the protocol stack of the broadcasting system which employ|adopted the MMT system. The schematic diagram which shows the structure of a TLV packet. The figure for explaining the outline of the recording processing by an electronic device. The figure for explaining the outline of the recording processing by an electronic device. The figure for explaining the outline of the recording processing by an electronic device. The figure for explaining the outline of the recording processing by an electronic device. FIG. 3 is a block diagram showing an example of a functional configuration of an optical disc recording unit. The flowchart which shows an example of the processing procedure of an electronic device at the time of recording a program. The flowchart which shows an example of the processing procedure of alignment processing. The flowchart which shows an example of the processing procedure of an electronic device at the time of reproducing a program. 9 is a flowchart showing an example of a processing procedure when an arbitrary TLV packet is recorded in a storage area starting from the beginning of a read block. The figure which shows the TLV packet in the state which is straddling the continuous read block. The figure which shows the state in which the NULL packet was inserted. The figure for explaining an example of the system configuration of an electronic device.

Hereinafter, embodiments will be described with reference to the drawings.
FIG. 1 shows an example of the configuration of the electronic device according to the present embodiment. The electronic device according to the present embodiment is a broadcast receiving device that receives (a stream of) a broadcast wave including a program (program) transmitted according to the MMT method in a broadcasting system that adopts the MMT (MPEG Media Transport) method. .. The MMT method is a media transport method capable of transmitting and receiving data via a plurality of transmission paths such as broadcasting and communication.

The electronic device according to the present embodiment has a function of recording a program in a broadcasting system, and includes, for example, a television (TV), a DVD (Digital Versatile Disk) and a BD (Blu-Ray (registered trademark) Disk) recorder, and a personal computer ( PC) or the like. Further, the electronic device may be, for example, a smartphone or the like connected to the optical drive.

As shown in FIG. 1, the electronic device 10 includes a broadcast receiving unit 11, a CAS decoding unit 12, a separating unit 13, a decoding unit 14, an output unit 15, an HDD recording unit 16, an HDD reproducing unit 17, an optical disc recording unit 18, and an optical disc. The reproducing unit 19 is included.

The broadcast receiving unit 11 receives and selects a broadcast wave transmitted by a transponder (transmitter) not shown. The broadcast waves received by the broadcast receiving unit 11 include broadcast waves of terrestrial digital, BS, CS, advanced BS, advanced CS, and the like.

Here, the broadcast wave in the broadcasting system adopting the above MMT (MPEG Media Transport) system includes a TLV (Type Length Value) packet in which video data and audio data forming a program (data) are multiplexed. Further, according to the MMT method, a maximum of three programs are multiplexed in the broadcast wave transmitted from a single transponder. Further, this broadcast wave (stream thereof) is subjected to encryption processing in, for example, a conditional access system (CAS).

The CAS decoding unit 12 decodes the stream of the broadcast wave received by the broadcast receiving unit 11.

The separation unit 13 separates one program from the broadcast wave stream decoded by the CAS decoding unit 12. The program separated by the separation unit 13 is selected by the user, for example.

Here, one program separated by the separating unit 13 is multiplexed by TLV (/MMT). For this reason, the decoding unit 14 separates the video data (video elementary stream) and the audio data (audio elementary stream) from one program (stream thereof) separated by the separation unit 13.

The video data and the audio data are encoded by a predetermined encoding method. Specifically, the video data is coded by, for example, HEVC (High Efficiency Video Coding). Further, the audio data is encoded by, for example, ACC (Advanced Audio Coding). The decoding unit 14 decodes the video data and audio data encoded in this way.

The output unit 15 outputs the video data, the audio data, and the like decoded by the decoding unit 14. When the electronic device 10 includes a display and a speaker, the output unit 15 outputs video data and audio data to the display and the speaker. Further, the video data and the audio data may be output to an external device of the electronic device 10 via, for example, a video/audio output interface terminal.

Here, it is assumed that a removable HDD (hard disk drive) recording medium 20 is connected to the electronic device 10 according to the present embodiment via, for example, a USB interface. The HDD recording unit 16 records (records) the program separated by the separation unit 13 on the HDD recording medium 20. The HDD recording medium 20 may be built in the electronic device 10.

The HDD reproducing unit 17 reproduces the program recorded on the HDD recording medium 20. When the HDD recording medium 20 is used by being connected to the electronic device 10, the program recorded on the HDD recording medium 20 can be played back only when the HDD recording medium 20 is connected to the electronic device 10. It may be provided with a mechanism such that Even if the electronic device 10 has the HDD recording medium 20 built therein, the program recorded in the HDD recording medium 20 is designed to be reproducible only in the electronic device 10. May be.

Further, for example, an optical disk drive device (not shown) capable of detachably handling the optical disk recording medium 30 is connected to the electronic device 10 according to the present embodiment. The optical disc recording medium 30 includes, for example, a recordable Blu-ray disc.

The optical disc recording unit 18 records (records) the program separated by the separating unit 13 on the optical disc recording medium 30. It is also possible to record the program recorded on the HDD recording medium 20 on the optical disc recording medium 30.

The optical disc reproducing unit 19 reproduces the program recorded on the optical disc recording medium 30. The program recorded on the optical disc recording medium 30 can be reproduced by any device other than the electronic device 10 as long as it is a reproducing device that supports the optical disc recording medium 30.

FIG. 2 shows an example of a protocol stack of a broadcasting system adopting the MMT method in this embodiment.

The protocol stack shown in FIG. 2 includes video data encoded by TLV-SI, IP-SI, MMT-SI, HEVC, audio data encoded by AAC, data for data broadcasting, subtitle data, and existing media ( It is composed of MPEG-2 TS), application/electronic program guide (EPG), content download data, and the like.

As shown in FIG. 2, MMT-SI, video data, audio data, data for data broadcasting, caption data, existing media, and application/EPG are stored in an MMT packet. The IP-SI and MMT packets are converted into IP packets. The TLV packet stores one or more such IP packets. Further, TLV-SI is stored in the TLV packet.

The MMT-SI is transmission control information (service information) indicating a program configuration and the like. The MMT-SI is in the form of an MMT control message, and is MMT packetized as described above. The MMT packet includes identification information (ID) for identifying a program including video data and audio data stored in the MMT packet, for example. IP-SI is transmission control information regarding IP packets. TLV-SI is transmission control information regarding multiplexing of IP packets.

In this embodiment, various media of AV data (video data and audio data) and service information (SI) are packetized by MMT, addressed by UDP/IP, and each packet is multiplexed by TLV. Is transmitted.

FIG. 3 is a schematic diagram showing the structure (structure) of a TLV packet. As shown in FIG. 3, the TLV packet includes 2 bits of “01”, 6 bits of “111111”, a packet type, a data length, and data.

The packet type is 8-bit information for identifying the type of packet stored in the TLV. The packet type includes IPv4 (Internet Protocol Version 4), IPv6 (Internet Protocol Version 6), IP compressed (IP Compressed), NULL, and the like.

The data length is 16-bit information for writing the number of bytes of the subsequent data. After the data length, data of the number of bytes indicated by the data length is arranged.

The data (size) included in the TLV packet is 8×N bits, and the TLV packet is a variable length packet. In such a TLV packet, as shown in FIG. 3, “01”, “111111”, the packet type, the data length, and the data are transmitted in this order. Therefore, even if the TLV packet is a variable length packet, the TLV packet is transmitted. It becomes possible to grasp the end of the packet (and the beginning of the next TLV packet) and successively receive and process consecutive TLV packets (TLV stream).

Here, as described above, the electronic device 10 according to the present embodiment is applied to a broadcasting system that adopts the MMT system, receives a broadcast wave that complies with the MMT system, and records a program included in the broadcast wave. can do. When recording the above-mentioned advanced BS/CS broadcast, etc., one program is extracted from the broadcast wave stream in which a plurality of programs are multiplexed, and the stream of this program (TLV stream) is recorded as a file. To be done.

The outline of the recording process by the electronic device 10 according to the present embodiment will be described below with reference to FIGS. 4 to 7.

When a program included in a broadcast wave is recorded, a packet storing video data, audio data, and the like that compose the program is recorded on a recording medium. When reproducing a program recorded in this way, the packets recorded in the recording medium are sequentially read in units called read blocks (read blocks). The data (packet) in the read block cannot be read from the middle of the read block, and must be read from the beginning of the read block.

In the present embodiment, the program included in the broadcast wave according to the MMT system is recorded. First, referring to FIG. 4, the program included in the broadcast wave according to the MPEG-2 TS system is recorded on the recording medium. The relationship between the MPEG-2 TS packet of the program and the read block in the case of being performed will be described.

Hereinafter, it is assumed that the program is recorded on the optical disc recording medium. If the optical disc recording medium is a Blu-ray disc, the above-mentioned read block is an ECC (Error Correction Code) block for error correction, and the ECC block is 64 KB.

Since the MPEG-2 TS packet has a fixed length (packet) of 192 bytes, the MPEG-2 TS packet 301 of the program recorded on the optical disc recording medium is aligned (arranged) in the read block as shown in FIG. ..

The packets recorded on the optical disc recording medium include a packet corresponding to an I frame (key frame) that holds information on all the frames of a program, and a frame compressed by inter-frame prediction (I frame and And a packet corresponding to a frame holding the information of the difference (1).

Here, it is assumed that an error occurs in reading the data (MPEG-2 TS packet 301) of the second or third layer of the optical disc recording medium.

When an error occurs during reading in this way, the MPEG-2 TS corresponding to the I frame (key frame) of the program in the MPEG-2 TS packet 301 recorded after the position where the error occurred is recorded. It is necessary to read the packet 301 from the MPEG-2 TS packet 301.

For this purpose, it is necessary to find the beginning of the MPEG-2 TS packet 301 corresponding to the I frame, but since the MPEG-2 TS packet 301 is a fixed length packet as described above, the read block as shown in FIG. And the beginning of the MPEG-2 TS packet 301 coincide with each other. Therefore, even if an error occurs as described above, the head of the MPEG-2 TS packet 301 can be found by reading the read block next to the read block in which the error has occurred from the head.

Even if the MPEG-2 TS packet 301 is not the MPEG-2 TS packet 301 corresponding to the I frame, the beginning of the next MPEG-2 TS packet 301 can be found by reading the MPEG-2 TS packet 301. Since the packet 301 can be sequentially read, the head of the MPEG-2 TS packet 301 corresponding to the I frame that is aligned subsequently can be found.

On the other hand, FIG. 5 shows a relationship between a TLV packet and a read block (ECC block) of a program included in a broadcast wave according to the MMT system when the program is recorded on an optical disc recording medium (Blu-ray disc). ..

When a program included in a broadcast wave according to the MMT method is recorded, the program is recorded on the optical disc recording medium in the state of the TLV packet 302, and the TLV packet 302 is the MPEG-2 TS packet 301 described above. Differently, it is a variable length packet. Therefore, the TLV packet 302 of the program recorded on the optical disc recording medium is not necessarily aligned with the read block as shown in FIG.

Here, it is assumed that an error occurs in reading the data (TLV packet 302) of the optical disc recording medium (in the reading block) as described above. In this case, it is necessary to find the beginning (decoding start point) of the subsequent TLV packet 302 (for example, the TLV packet 302 corresponding to the I frame), but since the TLV packet 302 is a variable length packet, FIG. As shown in, the head of the read block and the head of the TLV packet 302 do not always match. Therefore, unlike the case of reading the above-described MPEG-2 TS packet 301, even if the data of the next read block is simply read, the beginning of the TLV packet 302 cannot be found, and it corresponds to the subsequent I frame. The head of the TLV packet 302 cannot be found either.

Therefore, for example, it is possible to prepare an Entry Point MAP (hereinafter referred to as an EP MAP). This EP MAP includes a table indicating the position of the I frame of the recorded program (the position of the head of the TLV packet 302 corresponding to the I frame included in the program).

According to this, for example, when an error occurs in reading the data of the read block 401 shown in FIG. 6, it is possible to find the head of the TLV packet 302 corresponding to the I frame by referring to the EP MAP 501. The TLV packet designated by the EP MAP 501 is shown as the TLV packet 302a in FIG. 6 for convenience.

However, as described above, it is necessary to read the data in the read block from the beginning of the read block. Therefore, as shown in FIG. 6, in order to read from the TLV packet 302a designated by the EP MAP 501, the TLV packets 302 are sequentially read from the beginning of the read block 402, and the leading position of the TLV packet 302a designated by the EP MAP 501 is read. Data (TLV packet) will be discarded. The reading and discarding of the data causes a delay in reading the data (that is, reproduction processing of the recorded program).

Therefore, in the present embodiment, as shown in FIG. 7, the TLV packet 302a is aligned so that the head of the TLV packet 302a in the read block 402 designated by the EP MAP 501 matches the head of the next read block 403. .. In this case, assuming that the TLV packet immediately before the TLV packet 302a designated by the EP MAP 501 is the TLV packet 302b, when the end of the TLV packet 302b does not match the end of the read block 402 (the beginning of the read block 403). A NULL packet, which is a packet including invalid data, is inserted between the end of the TLV packet 302b and the beginning of the read block 403 (the beginning of the TLV packet 302a).

According to this, for example, when an error occurs in the reading of the data in the reading block 402, the TLV packet 302a corresponding to the I frame is read by referring to the EP MAP 501, but in that case, unnecessary data is written. It is possible to read the TLV packet 302a from the beginning of the read block 403 without discarding it.

FIG. 8 is a block diagram showing an example of the functional configuration of the optical disc recording unit 18 shown in FIG. As shown in FIG. 8, the optical disc recording unit 18 includes a TLV processing unit 181, an EP MAP generation unit 182, an alignment processing unit 183, an encryption unit 184, and an output unit 185.

The TLV processing unit 181 recognizes the type (classification) and size of each TLV packet in the TLV stream separated into one program (program) by the separation unit 13. The type and size of the TLV packet can be recognized from the packet type and the data length included in the above TLV packet.

When an I frame (a TLV packet corresponding to the ILV) is detected from the TLV stream, the TLV processing unit 181 determines the time stamp value of the frame, the packet position of the TLV packet (the number of bytes from the beginning of the TLV stream, etc.). And the packet number to the EP MAP generation unit 182.

The EP MAP generation unit 182 generates an EP MAP that indicates at least the position of the I frame, based on the time stamp value, the packet position, and the packet number sent from the TLV processing unit 181. The EP MAP generated by the EP MAP generation unit 182 has an entry point map format data structure.

The alignment processing unit 183 determines whether or not the TLV stream includes a NULL packet based on the type and size of the TLV packet recognized by the TLV processing unit 181. When the TLV stream includes a NULL packet, the alignment processing unit 183 deletes the NULL packet. As a result, the length of the TLV stream can be reduced and pressure on the capacity of the optical disc recording medium 30 can be prevented. When the NULL packet in the TLV stream is deleted, the position of the TLV packet corresponding to the I frame in the TLV stream changes. Therefore, when the NULL packet in the TLV stream is deleted, the EP MAP data generated by the EP MAP generation unit 182 in response to the deletion of the NULL packet (the TLV corresponding to the I frame designated by the EP MAP is deleted). The packet position) shall be modified (updated).

In addition, the alignment processing unit 183 performs a process of allocating (that is, aligning) each TLV packet (TLV stream) of the program to, for example, the recording area of the optical disc recording medium 30 in order to record the program. The alignment processing unit 183 executes the alignment process based on the EP MAP generated by the EP MAP generation unit 182, for example.

The encryption unit 184 performs an encryption process on the TLV stream aligned on the optical disc recording medium 30 by the alignment processing unit 183.

The output unit 185 records the TLV stream encrypted by the encryption unit 184 on the optical disc recording medium 30. The output unit 185 also records the EP MAP generated by the EP MAP generation unit 182 on the optical disc recording medium 30.

Hereinafter, the processing procedure of the electronic device 10 according to the present embodiment when recording a program will be described with reference to the flowchart in FIG. 9. Here, the recorded program is referred to as a target program. The target program is, for example, a program selected (designated) by the user, but may be, for example, a program automatically selected.

First, the broadcast receiving unit 11 receives (a stream of) a broadcast wave including a target program according to the MMT method (step S1). The broadcast wave stream received in step S1 has been subjected to the encryption processing in the conditional access system, and is decrypted by the CAS decryption unit 12.

Next, the separation unit 13 separates the target program from the broadcast wave stream decoded by the CAS decoding unit 12 (step S2). As described above, the MMT packet includes identification information (program identification information) for identifying a program composed of video data and audio data stored in the MMT packet. The separation unit 13 can separate the TLV stream (TLV packet) of the target program based on this program identification information.

In this case, the optical disc recording unit 18 records (the TLV stream of) the target program separated in step S2 on the optical disc recording medium 30 according to the TLV variable length packet system.

Specifically, the TLV processing unit 181 included in the optical disc recording unit 18 detects an I frame from the TLV stream of the target program separated by the separating unit 13. It is assumed that, for example, the I-frame and a frame other than the I-frame are encoded by a different encoding method, and the TLV processing unit 181 can detect the I-frame in the encoding method.

The EP MAP generation unit 182 generates an EP MAP indicating the position of the I frame of the target program detected by the TLV processing unit 181 (step S3). The EP MAP is generated based on the time stamp value of the I frame detected by the TLV processing unit 181, the packet position and the packet number of the TLV packet corresponding to the I frame.

Next, the alignment processing unit 183 executes the alignment process of the TLV stream (step S4). According to the alignment processing, each TLV packet in the TLV stream of the target program is aligned with the storage area of the optical disc recording medium 30, but the TLV packet (the beginning) designated by the EP MAP generated in step S3 is recorded on the optical disc. It is arranged at the head of the read block in the medium 30. Details of this alignment processing will be described later.

When the process of step S4 is executed, the encryption unit 184 executes the encryption process on the TLV stream (TLV packet) aligned on the optical disc recording medium 30 (step S5). In this encryption processing, encryption is performed with a key length of 128 bits in the AES method, for example. As the cipher use mode (encryption mode), for example, a CBC (Cipher Block Chaining) mode and a CTR (Counter) mode can be applied. A series of encryption processing by the encryption unit 184 is performed in the ECC block. It should be noted that the first 4 bytes of the ECC block are not encrypted and are set as plaintext, and the fifth and subsequent bytes are encrypted. Since the AES method is a 16-byte (128-bit) block cipher, a non-encrypted part occurs in the residual of the ECC block, but the residual part is left unencrypted. By making the first 4 bytes of the ECC block non-encrypted, the packet type and the packet length of the TLV packet can be detected without decoding. Note that the ECC block may be encrypted from the beginning. In this case, the residual part can be encrypted. The encryption processing in step S5 may be an encryption of at least a part of (the TLV packet in) the TLV stream.

When the process of step S5 is executed, the TLV stream (TLV packet) of the target program is recorded on the optical disc recording medium 30 based on the result of the alignment process in step S4 (step S5). Thereby, in the present embodiment, the target program is recorded on the optical disc recording medium 30. The EP MAP described above is also recorded on the optical disc recording medium 30.

Next, a processing procedure of the alignment processing shown in FIG. 9 (processing of step S4 shown in FIG. 9) will be described with reference to the flowchart of FIG.

In the alignment process, for example, as shown in FIG. 5, when aligning each TLV packet in the TLV stream of the target program in the recording area in order from the beginning of the TLV stream, the TLV packet (corresponding to the I frame of the target program ( The following processing of steps S11 to S15 is executed for each of the TLV packets designated by the EP MAP. Hereinafter, the TLV packet that is the target of the processing of steps S11 to S15 is referred to as the target TLV packet.

In this case, the alignment processing unit 183 acquires the position of the target TLV packet by referring to the EP MAP generated in step S3 shown in FIG. 9 described above (step S11). The position of the target TLV packet corresponds to the position (number of bytes) from the beginning of the TLV stream of the target program.

Here, when the optical disc recording medium 30 is a Blu-ray disc, the size of the ECC block corresponding to the read block is 64 Kbytes. In this case, assuming that the TLV stream of the target program is recorded from the beginning of a predetermined ECC block, the target TLV packet whose position is acquired in step S11 is aligned so as to match the beginning of the ECC block (read block). The data is recorded (recorded) when the position of the target TLV packet (the number of bytes from the beginning of the TLV stream) is a multiple of 64 Kbytes. The unit of K is 1000 or 1024.

Therefore, the alignment processing unit 183 divides the position of the target TLV packet by the block size of the ECC block (here, 64 Kbytes) (step S12).

Next, the alignment processing unit 183 determines whether or not a surplus has occurred as a result of the process of step S12 (step S13).

Here, if the remainder does not occur when the process of step S12 is executed (that is, the remainder is 0), the beginning of the target TLV packet is located at the beginning of the ECC block (that is, the ECC block). It matches with the beginning of the)). On the other hand, if a remainder occurs when the process of step S12 is executed, it is determined that the head of the target TLV packet is not located at the head of the ECC block (that is, does not match the head of the ECC block). can do.

Therefore, when it is determined that the remainder has occurred (YES in step S13), the alignment processing unit 183 sets the target TLV packet so that the head of the target TLV packet matches the head of the ECC block (read block). A NULL packet is inserted immediately before (step S14). The size of the NULL packet inserted in step S14 is a size corresponding to the remainder that is the result of the process in step S12. In other words, the size of this NULL packet is the recording area from the end of the TLV packet aligned immediately before the target TLV packet to the beginning of the ECC block next to the ECC block where the end of the TLV packet is located. It is a comparable size. Although a NULL TLV packet is assumed as the NULL packet inserted in step S14, a NULL MMT packet may be used, for example.

Note that the EP MAP generated in step S3 shown in FIG. 9 does not consider the presence of the NULL packet inserted in step S14. Therefore, when the process of step S14 is executed, the alignment processing unit 183 specifies the target specified by the EP MAP generated in step S3 shown in FIG. 9 based on the size of the NULL packet inserted in step S14. The position of the TLV packet is corrected (step S15). In this case, the position of the target TLV packet designated by the EP MAP is shifted by the size of the NULL packet inserted in step S14 and corrected so as to match the beginning of the ECC block.

Further, when the position of the target TLV packet is corrected, the position of the TLV packet (that is, the TLV packet corresponding to the I frame) following the target TLV packet also shifts by the size of the NULL packet. Therefore, in step S15, in addition to the position of the target TLV packet, the position of the TLV packet corresponding to the I frame arranged after the target TLV packet is also corrected.

On the other hand, when it is determined that the remainder does not occur (NO in step S13), the head of the target TLV packet and the head of the ECC block match as described above, and therefore the processes of steps S14 and S15 are not executed. ..

In the present embodiment, the processes of steps S11 to S15 described above are repeatedly executed for each TLV packet corresponding to the I frame of the target program. According to this, all TLV packets (that is, all TLV packets specified by EP MAP) corresponding to each of the I frames are recorded in the recording area starting from the beginning of the read block (ECC block). It will be.

On the other hand, when it is determined that there is no unprocessed TLV packet (NO in step S16), the process illustrated in FIG. 10 is ended.

Here, the case where a program is recorded in the electronic device 10 has been mainly described. However, in the electronic device 10, for example, the program recorded in the optical disc recording medium 30 can be reproduced by the optical disc reproducing unit 19. ..

Hereinafter, with reference to the flowchart of FIG. 11, a processing procedure of the electronic device 10 according to the present embodiment when a program recorded on the optical disc recording medium 30 is reproduced will be described. Here, the reproduced program is referred to as a target program. The program to be reproduced is selected (designated) by the user, for example.

In this case, the processes of the following steps S21 to S23 are executed in order from the first TLV packet in the TLV stream of the target program. Hereinafter, the TLV packet that is the target of the processing of steps S21 to S23 is referred to as the target TLV packet.

First, the optical disk reproducing unit 19 reads out the target TLV packet (step S21).

Here, it is determined whether or not an error has occurred in reading the target TLV packet (step S22).

When it is determined that an error has occurred (YES in step S22), the optical disc reproducing unit 19 refers to the EP MAP recorded in the optical disc recording medium 30, and refers to the read block next to the read block in which the target TLV packet is located. The position of the TLV packet corresponding to the I frame located thereafter is acquired (step S23).

When the process of step S23 is executed, the process returns to step S21 and the process is repeated. In the process of step S21 in this case, based on the position acquired in step S23, the TLV packet (that is, the TLV packet corresponding to the I frame) in which the position is acquired is read out.

In this case, since all the TLV packets corresponding to the I frame are recorded in the recording area starting from the beginning of the read block by the alignment processing shown in FIG. 10 described above, unnecessary data is not read in reading the TLV packet. Will never be discarded.

That is, in the reproduction process in the electronic device 10 according to the present embodiment, it is possible to efficiently read the recorded program.

On the other hand, when it is determined in step S22 that no error has occurred (NO in step S22), it is determined whether or not the reading has been completed for the last TLV packet in the TLV stream of the target program (step S24).

When it is determined that the reading of the last TLV packet is not completed (NO in step S24), the process returns to step S21 and the process is repeated. In this case, the TLV packet recorded next to the target TLV packet in the TLV stream of the target program is used as the target TLV packet, and the processes in and after step S21 are executed.

On the other hand, when it is determined that the reading of the last TLV packet is completed (NO in step S24), the process ends.

According to the processing shown in FIG. 11 described above, when an error occurs in the reproduction of the target program (that is, the reading of the recorded TLV stream), it is recorded in the recording area starting from the beginning of the subsequent read block. The reading of the TLV stream can be restarted from the TLV packet (TLV packet corresponding to the I frame).

Although omitted in FIG. 11, the NULL packet inserted in the TLV stream of the target program by the processing shown in FIGS. 9 and 10 described above is skipped, for example. This NULL packet may be deleted, for example.

As described above, in the present embodiment, a broadcast wave including a program (first program) is received according to the MMT method, an EP (Entry Point) MAP indicating at least the position of the I frame of the program is generated, and the program is The stream of the broadcast wave including the data is recorded on the optical disc recording medium 30 according to the variable length packet method of TLV. In this case, the first TLV packet of the program is recorded in at least a part of the first read block of the optical disc recording medium 30, and the second LTV packet next to the first TLV packet is the head of the second read block next to the first read block. It is recorded in the recording area on the optical disc recording medium 30 starting from. In addition, when the second TLV packet is designated by the EP MAP and the end of the first TLV packet does not match the end of the first read block (that is, the head of the second TLV packet does not match the head of the second read block), A NULL packet is inserted in the recording area on the optical disc recording medium 30 from the end of the first TLV packet to the beginning of the second read block.

According to the present embodiment, with such a configuration, even if an error occurs in (reading) data in the first read block, the TLV packet corresponding to the head of the next second read block and the I frame. Since the beginning of the TLV packet is the same, it is not necessary to read and discard unnecessary packets when reading the TLV packet corresponding to the I frame specified by EP MAP, and to realize efficient read processing (reproduction processing). You can

In the present embodiment, EP MAP indicates the position of each I frame of the program, and all TLV packets specified by the EP MAP are recorded in the recording area starting from the beginning of each different read block. It With such a configuration, it is possible to efficiently read the TLV stream of the recorded program regardless of the position where the error occurs.

In the broadcasting system using the MMT method as in the present embodiment, a plurality of programs are multiplexed in the broadcast wave (data series) received from a single transponder. Therefore, in the present embodiment, by separating a recorded program from a plurality of programs that are multiplexed based on the program identification information included in the TLV packet (MMT packet), the TLV stream of the program (the relevant A broadcast wave stream including a program) can be recorded on the optical disc recording medium 30.

In the present embodiment, the optical disc recording medium 30 includes a Blu-ray disc and the read block includes an ECC block. In this case, the TLV packet corresponding to the I frame can be recorded in the recording area starting from the beginning of the ECC block. Further, the TLV packet can be encrypted and recorded in the recording area.

Further, in the present embodiment, it is also possible to read the program recorded on the optical disc recording medium 30 and reproduce the program. If the NULL packet described in FIG. 9 and FIG. 10 is inserted when the TLV stream (TLV packet) is recorded on the optical disc recording medium 30, the NULL packet is skipped during the reproduction (reading) process or Processing such as deletion may be executed.

In the present embodiment, the TLV packet corresponding to the I frame is recorded in the recording area starting from the head of the read block (that is, the head of the TLV packet is matched with the head of the read block). Although it has been described that there is an advantage when an error occurs during the reading of the TLV stream, the TLV packet (TLV packet corresponding to the I frame) specified by EP MAP is used to perform fast-forward reproduction and rewind from the TLV packet. Even when performing at least one of the reproduction, the TLV packet specified by the EP MAP can be read without reading (that is, reading and discarding) unnecessary TLV packets, so that an efficient read process can be realized. It will be possible.

Here, the case in which the MPEG-2 TS packet is recorded is described in FIG. 4 described above, but as shown in FIG. 4, even if the packet is a packet other than the packet corresponding to the I frame, the packet is read. If the packet is recorded in the recording area starting from the beginning of the block, subsequent packets can be sequentially read from the packet, and as a result, the packet corresponding to the I frame can also be read.

Therefore, in the present embodiment, the TLV packet corresponding to the I frame has been described as being recorded in the recording area starting from the beginning of the read block, but any TLV packet (that is, the TLV packet specified by EP MAP or A TLV packet not specified by EP MAP) may be recorded in the recording area starting from the beginning of the read block.

The processing procedure when an arbitrary TLV packet is recorded in the recording area starting from the beginning of the read block will be described below with reference to the flowchart of FIG. The process shown in FIG. 12 may be executed as the alignment process shown in FIG.

Here, for example, as shown in FIG. 5, when aligning each TLV packet in the TLV stream of the target program in the recording area in order from the head of the TLV stream, the following steps S31 to S31 are performed for each of the TLV packets. The process of S34 is executed. Hereinafter, the TLV packet that is the target of the processing of steps S31 to S34 is referred to as the target TLV packet.

In this case, the alignment processing unit 183 acquires the position of the target TLV packet (step S31). Here, assuming that the target TLV packet has the configuration shown in FIG. 3, the alignment processing unit 183 can acquire the size of the target TLV packet. Therefore, the alignment processing unit 183 acquires, as the position of the target TLV packet, the head (position) and the end (position) of the recording area on the recording medium in which the target TLV packet is recorded. The head of the recording area in which the target TLV packet is recorded is, for example, the end of the recording area in which the immediately preceding TLV packet is recorded. When the target TLV packet is the first TLV packet of the TLV stream, the head of the recording area in which the target TLV packet is recorded is the head of the recording area in which the TLV stream is recorded. On the other hand, the end of the recording area in which the target TLV packet is recorded can be calculated based on the head of the recording area in which the target TLV packet is recorded and the size of the target TLV packet.

Next, the alignment processing unit 183 determines, based on the position of the target TLV packet acquired in step S31, that the target TLV packet (that is, the recording area in which the target TLV packet is recorded) defines a boundary between consecutive read blocks. It is determined whether or not to straddle (step S32).

When it is determined that the target TLV packet crosses the boundary of consecutive read blocks (YES in step S32), the alignment processing unit 183 determines that the head of the target TLV packet is the read block in which the head of the target TLV packet is located. A NULL packet is inserted immediately before the target TLV packet so as to match the beginning of the next read block (step S33).

According to the process of step S33, the NULL packet 602 is inserted in order to shift the start position of the target TLV packet 601 which straddles the read blocks 701 and 702 as shown in FIG. 13 as shown in FIG. As a result, the target TLV packet 601 can be recorded in the recording area starting from the beginning of the read block 702.

The size of the NULL packet inserted in step S23 is a size corresponding to the recording area from the position (head) of the target TLV packet 601 acquired in step S21 to the head of the read block 702.

When the NULL packet is inserted as described above, the position of the TLV packet corresponding to the subsequent I frame changes, so the alignment processing unit 183 corrects the position of the TLV packet in the EP MAP (step S34). The process of step S34 corresponds to the process of step S15 shown in FIG.

When it is determined that the target TLV packet does not cross the boundary of continuous read blocks (NO in step S32), the target TLV packet is aligned with the recording area next to the immediately preceding TLV packet, for example, and The processes of S33 and S34 are not executed.

Next, it is determined whether or not the processes of steps S31 to S34 have been executed for all the TLV packets in the TLV stream of the target program (that is, whether there is an unprocessed TLV packet) (step S35).

When it is determined that the process has not been executed for all TLV packets (NO in step S35), the process returns to step S31 and the process is repeated. In this case, the unprocessed TLV packet is set as the target TLV packet, and the processes in and after step S31 are executed.

On the other hand, if it is determined that the processing has been executed for all TLV packets (YES in step S35), the processing ends.

According to the processing shown in FIG. 12 described above, an arbitrary TLV packet (that is, a TLV packet specified by EP MAP or a TLV packet not specified by EP MAP) is recorded in the recording area starting from the beginning of the read block. R. According to such a configuration, since the heads of all the read blocks match the heads of arbitrary TLV packets, even if an error occurs in reading the TLV stream, for example, refer to EP MAP. Instead, reading may be started from the next reading block.

Note that FIG. 12 does not consider whether or not the TLV packet recorded in the recording area starting from the beginning of the read block is the TLV packet specified by EP MAP. However, for example, all the TLV packets specified by EP MAP are aligned so that they are recorded in the recording area starting from the beginning of the read block, and for the read block in which the TLV packet specified by the EP MAP is not recorded, May be aligned so that a TLV packet not specified by EP MAP is recorded in the recording area starting from the beginning. In other words, the TLV packet not specified by the EP MAP may be recorded in the recording area starting from the beginning of the read block other than the read block in which the TLV packet specified by the EP MAP is recorded.

In the present embodiment, the case where a program is recorded (the TLV packet stream is recorded) on the optical disc recording medium 30 has been mainly described, but in the present embodiment, a recording medium other than the optical disc recording medium 30 (for example, , HDD recording medium 20) may be applied when recording a program. It is also possible to record a program on the HDD recording medium 20 by the processing described in the present embodiment and record (record) the program recorded on the HDD recording medium 20 on the optical disc recording medium 30.

An example of the system configuration of the electronic device 10 (computer) according to the present embodiment will be described below with reference to FIG. As shown in FIG. 15, the electronic device 10 includes a CPU 101, a ROM (nonvolatile memory) 102, a RAM (main memory) 103, an input device 104, an output device 105, a communication device 106, and the like.

The CPU 101 is a hardware processor that controls the operation of each component in the electronic device 10. The CPU 101 executes various programs (software) loaded from the storage device ROM 102 to the RAM 103.

It is assumed that some or all of the functional units 11 to 19 included in the electronic device 10 illustrated in FIG. 1 are implemented by causing the CPU 101 to execute a program, that is, software. Further, some or all of these functional units 11 to 19 may be realized by hardware such as an IC (Integrated Circuit), or may be realized as a combined configuration of the software and hardware.

The program executed by the CPU 101 may be stored in a computer-readable storage medium and distributed, or may be downloaded to the electronic device 10 through a network. The program may be processed by one computer, or may be processed in a distributed manner by a plurality of computers.

The input device 104 includes, for example, a keyboard, a mouse, a microphone, and the like. The output device 105 includes, for example, a display capable of displaying a reproduced program and a speaker.

The communication device 106 is, for example, a device configured to perform wireless communication with various devices outside the electronic device 10.

Although not shown in FIG. 15, the electronic device 10 according to the present embodiment includes, for example, a hard disk drive and an optical drive for recording a program on the HDD recording medium 20 and the optical disk recording medium 30 described above. It doesn't matter.

While some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and their modifications are included in the scope of the invention and the scope thereof, as well as in the invention described in the claims and the scope of equivalents thereof.

DESCRIPTION OF SYMBOLS 10... Electronic device, 11... Broadcast receiving part, 12... CAS decoding part, 13... Separation part, 14... Decoding part, 15... Output part, 16... HDD recording part, 17... HDD reproducing part, 18... Optical disk recording part ( Recording unit), 19... Optical disc reproducing unit, 20... HDD recording medium, 30... Optical disc recording medium, 101... CPU, 102... ROM, 103... RAM, 104... Input device, 105... Output device, 106... Communication device.

Claims (20)

A receiving unit for receiving a broadcast wave including the first program according to the MMT (MPEG Media Transport) system;
A recording unit that generates an Entry Point MAP indicating at least the position of the I frame of the first program, and records a stream of a broadcast wave including the first program on a recording medium according to a variable length packet system of TLV (Type Length Value). With and
The recording unit records the first TLV packet of the first program in at least a part of the first read block of the recording medium,
A second TLV packet next to the first TLV packet is recorded in a recording area on the recording medium starting from the beginning of a second read block next to the first read block,
If the second TLV packet is designated by the Entry Point MAP and the end of the first TLV packet does not match the end of the first read block, the end of the first TLV packet starts from the end of the second read block. An electronic device for inserting a NULL packet into the recording area on the recording medium up to. The Entry Point MAP indicates the position of the I frame included in the first program,
The electronic device according to claim 1, wherein the TLV packet specified by the Entry Point MAP is recorded in a recording area on the recording medium starting from the head of each read block. The electronic device according to claim 1, wherein the third TLV packet not designated by the Entry Point MAP is recorded in a recording area on the recording medium starting from the head of the third read block. The receiving unit receives the broadcast wave from a transponder,
A plurality of programs including the first program are multiplexed in the broadcast wave received from the transponder,
The first TLV packet and the second TLV packet include program identification information for identifying the first program,
The recording unit separates the first program from the plurality of multiplexed programs based on the program identification information included in the first TLV packet and the program identification information included in the second TLV packet. The electronic device according to claim 1, wherein a stream of one program is recorded on the recording medium. The recording medium is a Blu-ray disc,
The first read block and the second read block are ECC blocks,
The electronic device according to claim 1, wherein the recording unit records the second TLV packet in the recording area starting from a head of the ECC block. The electronic device according to claim 1, wherein the recording unit encrypts at least a part of the first TLV packet and at least a part of the second TLV packet and records the encrypted area in the recording area. A reproducing unit for reading the first program from the recording medium and reproducing the first program;
The electronic device according to any one of claims 1 to 6, further comprising: a display capable of displaying the reproduced first program. The electronic device according to claim 7, wherein the reproducing unit reads the second TLV packet specified by the Entry Point MAP from the head of the second read block when an error occurs in reading the first TLV packet. 9. The electronic device according to claim 7, wherein the reproducing unit uses a TLV packet specified by the Entry Point MAP to perform at least one of fast-forward reproduction and rewind reproduction. The first program is read from a recording medium in which a broadcast wave stream including the first program received according to the MMT (MPEG Media Transport) system is recorded according to the variable length packet system of TLV (Type Length Value), and the first program is read. A playback unit for playing
The first TLV packet of the first program is recorded in at least a part of the first read block of the recording medium,
A second TLV packet next to the first TLV packet is recorded in a recording area on the recording medium starting from the beginning of a second read block next to the first read block,
The second TLV packet is designated by an Entry Point MAP that indicates at least the position of the I frame of the first program,
The end of the first TLV packet does not match the end of the first read block,
A NULL packet is inserted in the recording area on the recording medium from the end of the first TLV packet to the beginning of the second read block.
The reproducing apparatus may be configured to read the second TLV packet designated by the Entry Point MAP from the beginning of the second read block when an error occurs in the first TLV packet. Receiving a broadcast wave including a first program according to an MMT (MPEG Media Transport) system;
Generating an Entry Point MAP indicating at least the position of the I frame of the first program, and recording a broadcast wave stream including the first program on a recording medium according to a variable length packet method of TLV (Type Length Value) And
The step of recording is
Recording a first TLV packet of the first program in at least a portion of a first read block of the recording medium;
If the second TLV packet next to the first TLV packet is designated by the Entry Point MAP and the end of the first TLV packet does not match the end of the first read block, the end part of the first TLV packet is changed to the end part of the first TLV packet. Inserting a NULL packet into the recording area on the recording medium up to the beginning of the second read block next to the first read block,
Recording the second TLV packet in a recording area on the recording medium starting from the beginning of the second read block. The Entry Point MAP indicates the position of the I frame included in the first program,
The method according to claim 11, wherein the second TLV packet specified by the Entry Point MAP is recorded in a recording area on the recording medium starting from the head of each read block. The method according to claim 11 or 12, wherein the third TLV packet not designated by the Entry Point MAP is recorded in a recording area on the recording medium starting from the beginning of the third read block. In the step of receiving, receiving the broadcast wave from a transponder,
A plurality of programs including the first program are multiplexed in the broadcast wave received from the transponder,
The first TLV packet and the second TLV packet include program identification information for identifying the first program,
The step of recording separates the first program from the plurality of multiplexed programs based on the program identification information included in the first TLV packet and the program identification information included in the second TLV packet, and 14. A method according to any one of claims 11 to 13, comprising recording a stream of a first program on the recording medium. The recording medium is a Blu-ray disc,
The first read block and the second read block are ECC blocks,
15. The method according to claim 11, wherein the recording step includes a step of recording the second TLV packet in the recording area starting from a head of the ECC block. The recording step includes the step of encrypting at least a part of the first TLV packet and at least a part of the second TLV packet and recording the encrypted area in the recording area. the method of. Reading the first program from the recording medium and playing the first program;
18. The method of claim 11, further comprising: displaying the played first program on a display. 18. The method according to claim 17, wherein the reproducing step includes a step of reading a second TLV packet designated by the Entry Point MAP from a head of the second read block when an error occurs in reading the first TLV packet. 19. The method according to claim 17, wherein the reproducing step includes a step of performing at least one of fast-forward reproduction and rewind reproduction using a TLV packet specified by the Entry Point MAP. A broadcast wave stream including a first program received according to an MMT (MPEG Media Transport) system is recorded according to a TLV (Type Length Value) variable length packet system, and the first program is read out to reproduce the first program. The steps of
The first TLV packet of the first program is recorded in at least a part of the first read block of the recording medium,
A second TLV packet next to the first TLV packet is recorded in a recording area on the recording medium starting from the beginning of a second read block next to the first read block,
The second TLV packet is designated by an Entry Point MAP indicating at least the position of the I frame of the first program,
The end of the first TLV packet does not match the end of the first read block,
A NULL packet is inserted in the recording area on the recording medium from the end of the first TLV packet to the beginning of the second read block,
In the reproducing step, when an error occurs in the first TLV packet, the second TLV packet designated by the Entry Point MAP is read from the head of the second read block.

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