JP2013098721A - Transport stream recording device and transport stream recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transport stream recording device capable of re-multiplex processing even when TS does not include a null packet.SOLUTION: According to an embodiment, a television receiver 1 includes a packet conversion section 31, a null packet register 34, a null packet insertion section 32, and a re-multiplex processing section 20. The packet conversion section 31 converts TS packets so as to output the TS packets by an output clock of a frequency higher than a frequency of an input clock of the TS packets in inputted first TS. The null packet insertion section 32 inserts a null packet stored in the null packet register 34 between the TS packets converted in the packet conversion section 31, and the position of the first TS to insert the null packet can be specified. The re-multiplex processing section 20 outputs second TS for which the null packet inserted in the null packet insertion section 32 is replaced with a section TS packet.

Description

  Embodiments described herein relate generally to a transport stream recording apparatus and a transport stream recording method.

  In recent years, digitalization of broadcasting has progressed, and broadcast receiving apparatuses such as television receivers are also compatible with digital broadcasting. In digital broadcasting, video is generally compressed and broadcast, and the international standard for compression is the so-called transport stream (hereinafter also abbreviated as TS) in the so-called MPEG (Motion Picture Expert Group) system. Is adopted.

  Digital broadcasting includes a large number of channels, and programs with different contents are broadcast for each channel, and viewers can view many programs with high-quality images. In addition, the viewer uses a recorder, a television receiver with a recorder function, or the like to record a desired program from a program included in the digital broadcast on a storage device such as a hard disk device or a recording medium. Can do.

By the way, when content is recorded in a storage device or the like, section information such as PSI (Program Specific Information), SI (Service Information: Service Information), data, and the like, a null packet in the TS (Null Packet). In some cases, the content is recorded as a partial TS by performing a remultiplexing process included in (). Various types of information related to the content included in the content data by such re-multiplexing processing can be used for the playback processing and management of the recorded content.
However, when the received TS does not include a null packet, there is a problem that such re-multiplexing processing cannot be performed.

JP 2003-529296 A

  Therefore, an object of the embodiment is to provide a transport stream recording apparatus and a transport stream recording method capable of performing remultiplexing processing even when a TS does not include a null packet.

  According to the embodiment, the transport stream is output so that the transport stream packet is output at an output clock having a frequency higher than the frequency of the input clock of the transport stream packet in the input first transport stream. A packet conversion unit for converting a packet; a storage unit for storing a null packet; and the transport stream packet converted by the packet conversion unit, the null packet stored in the storage unit being inserted, and the null A position in the first transport stream where the packet is inserted can be specified, and a second packet packet is inserted in the null packet insertion unit, and the second packet is replaced with a packet having the section information. Transport stream And the transport stream output unit for outputting, the transport stream recording apparatus having provided.

It is a block diagram which shows the structure of the television receiver concerning 1st Embodiment. It is a block diagram which shows the structure of TS output part 13 concerning 1st Embodiment. It is a flowchart which shows the flow of a process of TS output part 13 concerning 1st Embodiment. It is a time chart until the received TS is remultiplexed according to the first embodiment. 6 is a flowchart illustrating an example of a processing flow in a PID filter and a remultiplex processing unit 20 according to the first embodiment. It is a block diagram which shows the structure of 1 A of television receivers which concern on 2nd Embodiment. It is a block diagram which shows the structure of 13 A of TS output parts which concern on 2nd Embodiment. It is a flowchart which shows the flow of a process of 13 A of TS output parts based on 2nd Embodiment. It is a flowchart which shows the example of the flow of a process in PID filter 14A based on 2nd Embodiment. It is a time chart until the received TS is remultiplexed according to the second embodiment. It is a time chart for demonstrating the case where n is 3 based on 1st and 2nd embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram illustrating a configuration of a television receiver according to the present embodiment. The television receiver 1 is a digital broadcast receiving device that receives a transport stream (TS), allows a user to watch and record a desired channel. The user can instruct the television receiver 1 which is also a transport stream recording apparatus to execute various functions by operating the remote controller 2.

  The television receiver 1 includes a broadcast receiving interface (I / F) 11, a receiving unit 12, a transport stream output unit (hereinafter referred to as a TS output unit) 13, a PID (packet ID) filter 14, a decoder 15, an image. An output interface (I / F) 16, an audio output interface (I / F) 17, a display device 18, a speaker 19, a remultiplex processing unit 20, a storage device 21 for recording a partial TS of received content, a control unit 22, The light receiving unit 23 is included.

  The television receiver 1 is a television receiver capable of receiving not only terrestrial digital broadcasting but also IP (Internet Protocol) broadcasting. IP broadcasting is broadcasting using an IP network such as the Internet. FIG. 1 shows a circuit related to reception of IP broadcasting, and a receiving circuit such as general terrestrial digital broadcasting is omitted.

  The broadcast receiving interface 11 is connected to a network NW such as the Internet, and the receiving unit 12 receives a broadcast signal via the interface 11. The reception unit 12 includes 12a in the reception buffer, receives the TS, and temporarily stores a plurality of TS packets (hereinafter, also simply referred to as packets) included in the received TS in the reception buffer 12a.

  The TS output unit 13 sequentially reads the received packets stored in the reception buffer 12a, generates a packet with a predetermined high clock frequency, and inserts and outputs a null packet between the packets as will be described later.

  The PID filter 14 extracts a packet with a target PID from the input packet and outputs it. Note that the PID filter 14 does not delete null packets, as will be described later. That is, the PID filter 14 is a filter that performs PID filtering by inputting the TS packet output from the TS output unit 13 without deleting the null packet inserted by the null packet insertion unit 32.

  The decoder 15 deletes the null packet from the packet output from the PID filter 14, decodes the packet, outputs the video signal to the display device 18 via the interface 16, and outputs the audio signal via the interface 17. To the speaker 19.

  The PID filter 14 deletes the null packet from the packet output from the TS output unit 13 and transmits the packet to the decoder 15 so that the packet output to the decoder 15 does not include the null packet. Then, the null packet may not be deleted from the packet output from the PID filter 14.

The remultiplex processing unit 20 replaces the null packet with the packet including the section information for the partial TS prepared by the control unit 22 and deletes the null packet that does not need to be replaced with the partial TS. Output to. The section information includes various information such as PSI and SI. The section information included in the partial TS is determined in advance.
The storage device 21 includes a storage device such as a hard disk drive and has a function of recording the input partial TS.

  The control unit 22 includes a central processing unit (CPU) and the like, and is a control unit that controls the entire television receiver 1. An infrared command from the remote controller 2 operated by the user is received by the light receiving unit 23, and the control unit 22 performs various functions in the television receiver 1 so as to realize a function according to the command received by the light receiving unit 23. Control the circuit.

  For example, when the user instructs a command for viewing a broadcast of a certain channel, the PID filter 14 selects and outputs a packet of the designated channel. The decoder 15 deletes the null packet from the packet output from the PID filter 14 and decodes it. The video signal is output from the interface 16, and the audio signal is output to the interface 17.

  In addition, when the user instructs a command to record the content of a broadcast program of a certain channel, the remultiplex processing unit 20 replaces the null packet in the packet to be recorded with the section information prepared by the control unit 22, and The result is output to the storage device 21 as a TS.

  FIG. 2 is a block diagram showing a configuration of the TS output unit 13. The TS output unit 13 includes a packet conversion unit 31, a null packet insertion unit 32, a packet output unit 33, and a null packet register 34. Further, the null packet insertion unit 32 includes a time stamp calculation unit 35.

  In this example, the received packet is converted into a packet having a higher transmission clock, and then a null packet is inserted. However, after the null packet is inserted, it may be converted into a packet having a higher transmission clock.

  Received packets Pin are sequentially input from the reception buffer 12a to the TS output unit 13. The packet converter 31 is a circuit that increases the frequency of the transmission clock and outputs the received packet without changing the transmission rate of the received packet. More specifically, the packet converter 31 converts the received TS reception packet, and outputs the received packet at a transmission clock higher than the transmission clock of the reception packet Pin.

  Here, the packet converting unit 31 converts the output clock of the received packet into a clock that is n times (n is a positive integer) the transmission clock of the received packet Pin, here twice, and outputs the received packet. To do. For example, when the received packet Pin is input to the TS output unit 18 at a transmission clock frequency f1 of 18 Mhz, the packet converter 31 outputs the received packet at a transmission clock frequency f2 of 36 Mhz.

  Here, an example will be described in which the transmission clock frequency f2 of the output received packet is twice the transmission clock frequency f1 of the received packet. However, the transmission clock frequency f2 of the output packet is 3 of the transmission clock frequency f1 of the received packet. It may be double or quadruple.

  As described above, the packet conversion unit 31 converts the received packet so that the TS packet is output with an output clock having a frequency higher than the frequency of the input clock of the received packet Pin that is a TS packet in the input TS. A packet converting unit.

The null packet insertion unit 32 is a processing unit that inserts a null packet between the received packets converted by the packet conversion unit 31. The null packet register 32 is a circuit as a storage unit that stores null packets.
Here, a register is used as a circuit for storing a null packet, but a memory may be used.

  Since a received packet having a double transmission clock is input to the null packet inserting unit 32, the null packet inserting unit 32 inserts a null packet stored in the null packet register 34 between two consecutive received packets. Output. That is, the null packet insertion unit 32 is a processing unit that inserts a null packet stored in the null packet register 32 that stores a null packet between TS packets converted by the packet conversion unit 31.

The time stamp calculation unit 35 included in the null packet insertion unit 32 is a circuit that calculates a time stamp to be added to the null packet when the received packet is a packet including a time stamp.
The packet output unit 33 outputs the output packet Pout in which a null packet is inserted between two received packets as a TS.

  FIG. 3 is a flowchart showing a process flow of the TS output unit 13. Here, a case where the received packet includes a time stamp will be described. Note that if the received packet does not include a time stamp, the process related to the time stamp is not performed.

As shown in FIG. 3, when the process is started, the packet conversion unit 31 receives the received packet Pin from the reception buffer 12a (S1), and converts the received packet Pin into a received packet P1 having a high transmission clock. (S2).
Then, the null packet insertion unit 32 calculates the time stamp of the null packet to be inserted from the time stamp included in the received packet Pin, and inserts the null packet with the time stamp between the received packets (S3).

  Then, the packet output unit 33 outputs the output packet Pout including the received packet P1 and the null packet (S4).

Note that, as described above, the received packet Pin is not converted into a packet having a higher transmission clock, and then a null packet is not inserted. In the case of conversion into a packet, the order of the processing of S2 and S3 described above is switched.
The above processes from S1 to S4 are repeated.

  FIG. 4 is a time chart until the received TS is remultiplexed. FIG. 4 is a diagram illustrating a case where the received packet P1 is generated when n is 2, that is, twice the transmission clock of the received packet Pin.

  First, the received packet Pin from the receiving unit 12 is input based on a clock corresponding to the transmission rate of the received packet Pin. FIG. 4 shows that the received packet Pin is input to the TS output unit 13 in order from 0 (zero).

  The received packet Pin is converted by the packet converting unit 31 into a received packet P1 having an output clock CLK twice the transmission clock of the received packet Pin and output to the null packet inserting unit 32.

  As shown in FIG. 4, since there is a space between the received packets P1, a null packet (Null) is inserted between the received packets P1 by the null packet inserting unit 32, and the received packet P1 and the null packet are inserted by the packet output unit 33. Is output.

  Note that, here, null packets are inserted between all two consecutive received packets, but null packets may not be inserted between all two consecutive received packets. For example, a null packet may be inserted at a designated position, such as every other or every other two received packets, according to a mode such as a recording mode. In this case, since the amount of section information included in the partial TS may differ depending on the mode, the null packet insertion unit 32 can specify the position in the TS where the null packet is inserted, depending on the mode. It has become. Therefore, the null packet insertion unit 32 has a designation function for designating the insertion position of the null packet. Therefore, in such a case, the null packet insertion unit 32 can designate a position in the TS into which the null packet is inserted.

  Further, in order to include a time stamp, that is, time information, in the null packet insertion unit 32, the null packet should be included in the null packet from the value of the last received packet Pin and the time stamp of the packet Pin received this time. The time stamp value is calculated, and the calculated time stamp is included in the null packet. In FIG. 2, the time stamp calculation unit 35 is included in the null packet insertion unit 32, but may be provided separately from the null packet insertion unit 32.

  In the time stamp calculation unit 35, for example, a time stamp is calculated as follows.

  If the time stamp value of the previously received packet Pin is ts1, the time stamp value of the currently received packet is ts2, and the number of null packet insertions counted from the previous packet is k, the time stamp value of the null packet to be inserted tsc is calculated from the following equation (1).

tsc = ts1 + ((ts2-ts1) / n) * k (1)
Note that the time stamp value tsc of the null packet to be inserted may be calculated by adding the difference value of the time stamp calculated from the input bit rate to the time stamp of the previous packet.

FIG. 5 is a flowchart illustrating an example of a processing flow in the PID filter 14 and the remultiplex processing unit 20.
As shown in FIG. 5, the PID filter 14 receives the output packet Pout from the TS output unit 13 (S11), and performs PID filtering without deleting the null packet (S12). Only packets of a desired channel are selected and output by PID filtering.

  The remultiplex processing unit 20 checks each packet input from the PID filter 14 and determines whether it is a null packet (S13). When the input packet is a null packet (S13: YES), the remultiplex processing unit 20 performs remultiplex processing (S14).

  In the remultiplexing process, a process of replacing the null packet with a packet including section information for the partial TS (hereinafter also referred to as a section TS packet) is executed. A section TS packet (indicated by “Remux” in FIG. 10) inserted in place of a null packet by re-multiplexing processing is inserted only at the beginning of the TS, periodically inserted, etc. Therefore, not all null packets are replaced by section TS packets. Therefore, in the remultiplexing process, not all null packets are replaced with section TS packets, but null packets that do not need to be replaced are deleted. That is, the null packet is a temporary packet for generating a partial TS, and the remultiplex processing unit 20 converts all or a part of the plurality of temporary packets included in the TS packet output from the PID filter 14 into a section. A transport stream output unit to be replaced with a packet having information is configured.

  The remultiplex processing unit 20 outputs and records the remultiplexed packet to the storage device 21 (S15). The remultiplex processing unit 20 checks the packet input from the PID filter 14, and when it is not a null packet (S13: NO), outputs the input packet to the storage device 21 and records it (S15). .

  As described above, the remultiplex processing unit 20 configures a transport stream output unit that outputs a TS in which a packet having section information about a TS packet is inserted between TS packets converted by the packet conversion unit 31. To do. The remultiplex processing unit 20 is a transport stream output unit that outputs a TS by replacing the temporary packet inserted by the null packet insertion unit 32, which is a temporary packet insertion unit, with a packet having section information.

  Referring to FIG. 4, the output packet Pout includes reception packets P1 and null packets alternately. The PID filter 14 selects and outputs the PID packet of the channel designated as the user desired to view or record from the output packet Pout input from the TS output unit 13 and does not delete the null packet.

The remultiplex processing unit 20 replaces the null packet in the output packet Pout from the PID filter 14 with the section TS packet, and outputs it.
As a result, as shown in FIG. 4, the remultiplex processing unit 20 outputs the received packet P1 and the section TS packet. The null packet that has not been replaced with the section TS packet is deleted by the remultiplex processing unit 20.
Note that the position of the null packet replaced in the remultiplex processing unit 20 differs depending on the content of the section information.

  When the user of the television receiver 1 previews a desired program, the above-described insertion of the null packet and conversion of the transmission clock are performed, but the null packet is deleted in the PID filter 14 and supplied to the decoder 15. Therefore, the user can view the program as usual, and since the insertion of the null packet and the conversion of the transmission clock are always performed, the recording process is started while the user is viewing. In this case, it is possible to quickly cope with the recording process.

  As described above, according to the television receiver 1 according to the above-described embodiment, a TS that does not include a null packet, such as IPTV, is re-multiplexed in the same manner as in normal terrestrial digital broadcasting. A packet including information can be included and recorded as a partial TS.

(Second Embodiment)
In the first embodiment, a reception packet having a clock frequency higher than the clock frequency of the transmission rate of the reception packet is generated, a null packet is inserted between the generated reception packets, and the remultiplex processing unit 20 Is replaced with a packet including section information. In contrast, in the second embodiment, the TS output unit generates a reception packet having a clock frequency higher than the clock frequency of the transmission rate of the reception packet, and includes section information between the generated reception packets. Insert packets directly.

  FIG. 6 is a block diagram showing a configuration of a television receiver 1A according to the second embodiment. The configuration and processing of the television receiver 1A according to the second embodiment are substantially the same as those of the television receiver 1 according to the first embodiment. In the second embodiment, the first embodiment is different from the first embodiment. About the same component, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the television receiver 1 </ b> A, the TS output unit 13 </ b> A inputs a received packet from the receiving unit 12. The output of the TS output unit 13A is input to the PID filter 14A, and the output of the PID filter 14A is supplied to the decoder 15 and the storage device 21.

  FIG. 7 is a block diagram showing the configuration of the TS output unit 13A. The TS output unit 13A includes a packet conversion unit 31, a section TS packet insertion unit 32A, a packet output unit 33, and a section TS packet register 34A as a storage unit. The section TS packet register 34A is a register that stores a packet having section information. Furthermore, the section TS packet insertion unit 32A includes a time stamp calculation unit 35. The section TS packet insertion unit 32A inserts a packet having section information stored in the section TS packet register 34A between TS packets converted by the packet conversion unit 31.

  FIG. 8 is a flowchart showing a process flow of the TS output unit 13A. In FIG. 8, after S2, the section TS packet insertion unit 32A calculates a time stamp of the section TS packet to be inserted by the time stamp calculation unit 35, and a section TS packet with the time stamp obtained by the calculation. Is inserted between the received packets P1 (S21).

  Then, the packet output unit 33 outputs the output packet Pout including the received packet P1 and the section TS packet (S22). That is, the section TS packet insertion unit 32A and the packet output unit 33 are transport stream output units that output TSs inserted between TS packets in which packets having section information about TS packets are converted by the packet conversion unit 31. Configure.

In this case as well, when the received packet Pin is converted into a packet with a higher transmission clock, instead of inserting a section TS packet after converting it into a packet with an increased transmission clock, it is converted into a packet with a higher transmission clock. The order of the processes of S2 and S21 is switched.
The processes from S1 to S22 are repeated.

FIG. 9 is a flowchart illustrating an example of a process flow in the PID filter 14A.
After S11, the PID filter 14 performs PID filtering (S31). Here, only the packet of the desired channel is selected and output and output by PID filtering, but the section TS packet is not deleted. Then, the PID filter 14A outputs the output packet Pout, that is, the recording packet Pr, to the decoder 15 and the storage device 21 (S32).

FIG. 10 is a time chart until the received TS is remultiplexed. As shown in FIG. 10, the section TS packet inserted between the received packets by the TS output unit 13A is supplied to the decoder 15 and the storage device 21 without being deleted by the PID filter 14A.
Therefore, the user can view the desired program and record the desired program.

  As described above, according to the television receiver 1A according to the above-described embodiment, a TS that does not include a null packet, such as IPTV, is re-multiplexed in the same manner as in normal terrestrial digital broadcasting. A packet including information can be included and recorded as a partial TS.

  As described above, according to each of the above-described embodiments, it is possible to provide a transport stream recording apparatus and a transport stream recording method capable of performing a remultiplexing process even when a TS does not include a null packet.

In each of the above-described embodiments, the case where n is 2, that is, the case where it is twice the transmission clock of the received packet Pin has been described, but n may exceed 2.
FIG. 11 is a time chart for explaining the case where n is 3. As shown in FIG. 11, the reception packet P1 is generated at three times the transmission clock of the reception packet Pin. A null packet (Null) is inserted in the gap between the received packets P1. The recording packet Pr is a partial TS including a section TS packet (indicated by “Rem” in FIG. 11).
Note that the time stamp of the inserted null packet can be calculated by the calculation such as the above-described equation (1).

  Although FIG. 11 shows a case where n is 3, there is a difference that the number of null packets (Null) inserted between the received packets P1 is 3 even when n is 4 or the like. The same as when n is 3.

  FIG. 11 is an example corresponding to the first embodiment, but also in the case corresponding to the second embodiment, the recording packet Pr is output from the TS output unit 13A instead of the output packet Pout in FIG. The

  Each “unit” in this specification is a conceptual one corresponding to each function of the embodiment, and does not necessarily correspond to a specific hardware or software routine on a one-to-one basis. Therefore, in the present specification, the embodiment has been described below assuming a virtual circuit block (unit) having each function of the embodiment. In addition, each step of each procedure in each embodiment may be executed in a different order for each execution by changing the execution order and executing a plurality of steps at the same time, as long as it does not contradict its nature.

  Although several embodiments of the present invention have been described, these embodiments are illustrated by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1, 1A television receiver, 2 remote control, 11, 16, 17 interface, 12 receiving unit, 12a receiving buffer, 13, 13A TS output unit, 14, 14A PID filter, 15 decoder, 18 display device, 19 speaker, 20 Remultiplexing processing unit, 21 storage device, 22 control unit, 23 light receiving unit, 31 packet conversion unit, 32 null packet insertion unit, 32A section TS packet insertion unit, 33 packet output unit, 34 null packet register, 34A section TS packet Register, 35 Time stamp calculator.

Claims (8)

Packet conversion for converting the transport stream packet so that the transport stream packet is output at an output clock having a frequency higher than the input clock frequency of the transport stream packet in the input first transport stream. And
A storage unit for storing null packets;
The null packet stored in the storage unit is inserted between the transport stream packets converted in the packet conversion unit, and the position in the first transport stream where the null packet is inserted can be specified. A null packet inserter,
A transport stream output unit that outputs a second transport stream in which the null packet inserted in the null packet insertion unit is replaced with a packet having the section information;
A transport stream recording apparatus. Packet conversion for converting the transport stream packet so that the transport stream packet is output at an output clock having a frequency higher than the input clock frequency of the transport stream packet in the input first transport stream. And
A transport stream output unit that outputs a second transport stream in which a packet having section information about the transport stream packet is inserted between the transport stream packets converted by the packet conversion unit;
A transport stream recording apparatus. A temporary packet insertion unit for inserting a temporary packet between the transport stream packets converted by the packet conversion unit;
The transport stream recording according to claim 2, wherein the transport stream output unit outputs the second transport stream by replacing the temporary packet inserted by the temporary packet insertion unit with a packet having the section information. apparatus.   The transport stream recording apparatus according to claim 3, wherein a position in the first transport stream into which the temporary packet is inserted in the temporary packet insertion unit can be specified. A storage unit for storing the temporary packet;
The transport according to claim 3 or 4, wherein the temporary packet insertion unit inserts the temporary packet stored in a storage unit that stores the temporary packet between transport stream packets converted by the packet conversion unit. Stream recording device.   The transport stream recording apparatus according to claim 3, wherein the temporary packet is a null packet. A storage unit for storing a packet having the section information;
The transport stream output unit inserts the packet having the section information stored in the storage unit that stores the packet having the section information, between the transport stream packets converted by the packet conversion unit. The transport stream recording device described in 1. The transport stream packet is output by the packet conversion unit so as to output the transport stream packet at an output clock having a frequency higher than the frequency of the input clock of the transport stream packet in the input first transport stream. Convert
A transport stream recording method for outputting a second transport stream in which a packet having section information on the transport stream packet is inserted between the converted transport stream packets.

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