JP2006060784A - Apparatus and method for processing transport stream and digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transport stream processing apparatus capable of efficiently utilizing processing performance of hardware and software. <P>SOLUTION: In the transport stream processing apparatus for separating desired data from a transport stream (TS) by executing a plurality of items of processing, a hardware transport stream separator 1 executes one part of the plurality of items of processing by a hardware configuration. A software transport stream separator 14 executes the residual processing of the plurality of items of processing which are not executed by the separator 1 by a software configuration. In this case, a processing switching device 15 switches to decide whether or not the separator 14 executes the residual processing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transport stream processing apparatus, a transport stream processing method, and a digital broadcast receiver having the apparatus for processing data input in a transport stream packet (hereinafter referred to as TSP) format in a digital broadcast receiver.

  For example, in Japan, CS digital broadcasting has been broadcast since 1995, and BS digital broadcasting has been broadcast since December 1, 2000. Broadcasting stations that transmit these broadcasts multiplex transport information (TS) by multiplexing digital information compressed video information, audio information, and additional information such as program information added thereto according to the MPEG2 system standard. After creation, the created transport stream (TS) is digitally modulated and transmitted. A digital broadcast receiver obtains a transport stream (TS) by digitally demodulating the received signal, and then separates and reproduces video, audio, and other information from the obtained transport stream (TS). To do.

  In CS and BS digital broadcasting, multiplexed data such as video and audio is thus superimposed and transmitted on a transport stream (TS), which is a fixed-length data string called a transport stream packet (TSP). Is done.

  FIG. 3 is a schematic diagram showing a general format of a transport stream packet (TSP). The transport stream packet (TSP) is a packet having a fixed length of 188 bytes, and the first 4 bytes are called a packet header. In the packet header, the first byte is a synchronization byte for synchronizing with the processing device that processes the transport stream packet (TSP), and the data value is always “47h” (h means a hexadecimal number). Thereafter, in the packet header, there is a transport error indicator (TEI) bit that is set to “1” when a data error is detected by the digital demodulation circuit, and the beginning of a section or packaged elementary stream (PES) packet. Payload unit start indicator (PUSI) bit indicating TSP scramble information, transport scramble control (TSC) bit indicating scramble information, adaptation field control (AFC) bit indicating the presence or absence of an adaptation field, and continuity counter indicating packet continuity (CC) etc. are assigned.

  The fifth and subsequent bytes of the transport stream packet (TSP) are composed of an adaptation field of variable length (N bytes) and a payload of variable length (188-4-N bytes). The payload area stores PES packets including images, audio, and captions, information for identifying a receiver, various service information, and the like.

  The transport stream packet (TSP) is transmitted in a state in which it is scrambled so that only a specific contractor can view it. Further, in the digital broadcast receiver, a filtering process for extracting only necessary data from the received transport stream packet (TSP) is performed. Therefore, the digital broadcast receiver outputs the transport stream packet (TSP) after performing descrambling processing and filtering processing. The output destination includes a memory that can be accessed by a processor (CPU), an AV decoder that extracts audio / video, and a partial transport stream (partial TS) output port. A device that performs processing such as filtering and descrambling on the transport stream packet (TSP) to separate and extract desired data is called a transport stream processing device.

  A conventional transport stream processing apparatus has the following three configurations. That is, the first configuration is a configuration in which all processing for transport stream separation is executed by hardware. The second configuration is a configuration in which all processing for transport stream separation is executed by software. The third configuration is a configuration in which processing is shared between hardware and software.

For example, Patent Documents 1, 2, and 3 disclose a transport stream separating apparatus that performs all of a plurality of processing steps for transport stream separation by hardware. Patent Document 4 discloses a transport stream separating apparatus that divides the processing process of hardware by software and software. In particular, Patent Document 3 also discloses a transport stream processing apparatus that outputs a partial transport stream (PTS) obtained by performing service information (SI) replacement processing on a transport stream (PTS).
JP-A-10-341419 JP2000-13448 (P2000-13448A) JP-A-11-239186 JP-A-10-210461

  The above-described conventional transport stream processing apparatus has the following problems. For example, since there are various processes in the service information (SI) replacement process performed on the same transport stream (TS), various versatile situations and states occur in the partial transport stream (PTS) output and the like. . For this reason, in a configuration in which all processing is performed by hardware, a high operating frequency and circuit addition are required to cope with all situations and states. In addition, in a configuration in which all processing is performed by software, high CPU power is always required to cope with all situations and states. Furthermore, in a configuration in which processing is shared between hardware and software, since the sharing of processing is fixed, the maximum performance may not be exhibited.

  Accordingly, a main object of the present invention is to provide a transport stream processing apparatus that can efficiently use the processing capabilities of hardware and software.

  In order to achieve the above object, a transport stream processing apparatus of the present invention is configured as follows in a transport stream processing apparatus that separates desired data from a transport stream (TS) by executing a plurality of processes. To do.

  That is, the transport stream processing apparatus of the present invention includes a hardware transport stream separator that executes a part of the plurality of processes in a hardware configuration, and the plurality of the plurality of processes that are not carried by the hardware transport stream separator. A software transport stream separator that executes the remaining processing of the process with a software configuration, and a process switch that switches whether the remaining processing is executed by the software transport stream separator.

  According to the present invention, by adding processing by software according to the situation, addition of new processing that could not be realized without adding a new hardware configuration as in the past, This can be realized without adding a new hardware configuration. In addition, execution / non-execution of the added process can be switched as necessary.

ADVANTAGE OF THE INVENTION According to this invention, the transport separation apparatus which can utilize the processing capability of hardware and software efficiently, and a digital broadcasting receiver which has it can be comprised.

  Before describing a specific example of the present invention, an outline of a basic configuration related to data reception in a digital broadcast receiver in which the present invention is implemented will be described with reference to FIG.

  In a digital broadcast receiver, a CPU (processor) 41, a memory (memory device) 42, a tuner 47, and a transport stream processing device 43 are mainly involved in data reception.

  The CPU 41 functions as a processor. The memory 42 has a device configuration that can be accessed by software operating on the CPU 41. The tuner 47 selects a target carrier from the received radio wave, performs demodulation and error correction, and performs processing up to selecting and outputting one transport stream from the carrier. The function of the transport stream processing device 43 is as described above. In FIG. 4, the flow of data and the flow of control are indicated by arrows, respectively.

  The transport stream processing device 43 includes a synchronizer 401, a PID filter 402, a descrambler 403, a section filter 404, a CRC check unit 405, an output unit 406, a PES packet filter 407, and service information (SI). A replacement unit 408 and a partial TS output unit 409 are provided. The identification data (PID) is packet identification data and is synonymous with a packet identifier.

  The synchronizer 401 detects the head data from the input transport stream (TS) and extracts and outputs the transport stream packet (TSP).

  The PID filter 402 outputs only the necessary transport stream packet (TSP) as the TS 401 based on the identification data (PID) of the transport stream packet (TSP) input from the synchronizer 401, and the unnecessary transport stream. Discard the packet (TSP).

  The descrambler 403 determines the transport scramble control (TSC) superimposed on the TS 401 (transport stream packet (TSP)) input from the PID filter 402, and determines that the TS 401 is scrambled. Cancels descrambling of TS 401 and outputs it as TS 402. When it is determined that the scramble is not applied, the descrambler 403 outputs the TS 401 without performing any processing.

  The section filter 404 extracts a section from the input TS 402 (descrambler-processed transport stream packet (TSP)) and performs a filtering process on the header section of the extracted section, so that only a necessary section is TS 403. Is output to the CRC checker 405, and unnecessary sections are discarded.

  The CRC checker 405 checks the CRC error (Cyclic Redundancy Check error) of the section of the input TS 403, gives a CRC check result to the section, and outputs it to the output unit 406 as TS 404.

  The output unit 406 outputs the input TS 404 to the memory 42. However, a section having no CRC (this section is a section having a section syntax indicator (SSI) = 0) is output from the output unit 406 without undergoing a CRC check by the CRC checker 405.

  The PES packet filter 407 extracts a PES packet from the input TS 402, and performs a filtering process to determine whether the extracted PES packet header is a necessary PES packet. Then, the PES packet filter 407 outputs the PES packet determined to be necessary to the output unit 406 as TS405, and discards the PES packet determined to be unnecessary. The output unit 406 outputs the input TS 405 to the memory 42.

  The service information (SI) replacement unit 408 and the partial TS output unit 409 are configured to take out a necessary program from an input transport stream (TS) and output it as a partial transport stream (PTS).

  The service information (SI) replacer 408 includes a transport stream packet (TSP) including a section (program information is stored) necessary for output as a partial transport stream (PTS) in the input TS 402. Are combined and output as TS407.

  Data stored in the section as program information includes PAT (program association table), PMT (program map table), SIT (selection information table), DIT (discontinuity information table), and the like.

  The partial TS output unit 409 outputs the TS 407 output from the service information (SI) replacement unit 408 to the outside of the transport stream processing apparatus as a partial transport stream (PTS).

  A processing example of the digital broadcast receiver when the service information (SI) replacement processing is performed will be described with reference to the flowchart of FIG. This flowchart is a service information (SI) replacement processing step by hardware.

  Step s51 includes a synchronization step s501, a PID filtering step s502, a descrambling step s503, an SI replacement step s504, and a partial TS output step s505.

  The synchronization step s501 detects the top data from the input transport stream (TS) and extracts the transport stream packet (TSP). At this time, the transport stream packet (TSP) to be extracted is given time stamp information indicating its arrival time.

  In the PID filtering step s502, necessary transport stream packets (TSP) and unnecessary transport stream packets (TSP) are classified based on the identification data (PID) of the transport stream packets (TSP) processed in step s501. Sort out. The necessary transport stream packet (TSP) is output as it is, and the unnecessary transport stream packet (TSP) is output with a discard log indicating that the transport stream packet (TSP) is discarded. . Furthermore, in this step s502, the transport stream packet (TSP) to be replaced in the service information (SI) replacement step s504 is selected, and the transport stream packet (TSP) to be replaced is replaced with the transport stream packet (TSP) to be replaced. A replacement log indicating that it is a processing target is attached and output.

  The descrambling step s503 determines whether or not the packet has been scrambled based on the transport scramble control (TSC) stored in the transport stream packet (TSP) processed in step s502. When it is determined that the data is scrambled, the scramble applied to the data is released (descrambled). When it is determined that the data is not scrambled, the data is not descrambled (descrambled).

  In service information (SI) replacement step s504, a transport stream packet (TSP) including a section storing program information of the transport stream (PTS) is added to the transport stream packet (TSP) processed in step s53. Generate. Specifically, the transport stream packet (TSP) to which the replacement log is assigned in step s502 is output by replacing the desired transport stream packet (TSP), and the transport log packet to which the discard log is assigned in step s502. The port stream packet (TSP) is overwritten with a transport stream packet (TSP) including a section storing program information and output. Even if the packet is a discard log addition packet, the remaining packet is discarded without being replaced.

  The output step s505 of the partial transport stream (PTS) outputs the transport stream packet (TSP) processed in s504 as a partial transport stream (PTS) to the outside of the transport stream processing apparatus according to the time stamp.

  Next, a transport stream processing apparatus according to an embodiment of the present invention and a digital broadcast receiver having the transport stream processing apparatus will be described in detail. FIG. 1 is a block diagram schematically showing a configuration relating to data reception in the digital broadcast receiving apparatus according to the present embodiment. In this digital broadcast receiving apparatus, the CPU (processor) 11, the memory (storage device) 12, the tuner 17, and the transport stream processing apparatus are mainly involved in data reception, as in the configuration of FIG. 4 described above. The memory 12 has a device configuration that can be accessed by software running on the CPU 11. The tuner 17 selects a target carrier wave from the received radio wave, performs demodulation and error correction, and performs processing up to selecting and outputting one transport stream from the carrier wave. Single-line arrows indicate the flow of control, and double-line arrows indicate the flow of data.

  A transport stream processing apparatus is an apparatus that performs a plurality of processing steps in order to separate desired data from a transport stream (TS). This transport stream processing apparatus includes a hardware transport stream separator 13, a software transport stream separator 14, and a processing switcher 15.

  The hardware transport stream separator 13 includes a synchronizer 101, a PID filter 102, a descrambler 103, a service information (SI) replacer 104, partial transport stream (PTS) output units 105 and 110, and an output. Device 106 and an input device 109. In the present embodiment, the output device 106 constitutes a first output device, and the partial transport stream (PTS) output device 110 constitutes a second output device.

  The synchronizer 101 detects head data of the input transport stream (TS), and further extracts a transport stream packet (TSP) from the input transport stream (TS). At the time of extraction, the synchronizer 101 adds time stamp information indicating the arrival time to the transport stream packet (TSP).

  The PID filter 102 selects necessary packets and unnecessary packets from the transport stream packet (TSP) input from the synchronizer 101, outputs the necessary packets as they are as the TS 101, and discards them as unnecessary packets. After giving a discard log indicating this, it is output as TS101.

  The PID filter 102 determines the necessity of a transport stream packet (TSP) based on identification data (PID) attached to the packet. Further, the PID filter 102 attaches a replacement log indicating that it is a replacement target to the transport stream packet (TSP) to be replaced by the service information (SI) replacer 104 disposed in the subsequent stage, and outputs it as TS101. To do.

  The descrambler 103 determines whether the TS 101 has been scrambled by reading the transport scramble control (TSC) assigned to the TS 101. When it is determined that the scramble is applied, the descrambler 103 cancels the descrambling of the TS 101 (descrambles), and outputs it as the TS 102. When it is determined that the scramble is not applied, the TS 101 is output as TS 102 without performing any processing.

  The service information (SI) replacement unit 104 synthesizes a transport stream packet (TSP) including a section storing program information of a partial transport stream (PTS) with the TS 102 and outputs the resultant as TS 103. Specifically, the transport stream packet (TSP) to which the replacement log is attached is output as TS103 by replacing the desired transport stream packet (TSP), and the transport stream packet (TSP) to which the discard log is attached. ) Is output by replacing the transport stream packet (TSP) including the section storing the program information. Even if a discard log is attached to a packet, the remaining packet is discarded without being replaced.

  The partial transport stream (PTS) output unit 105 outputs TS103 input from the service information (SI) replacement unit 104 as a partial TS1 to the outside of the transport stream processing apparatus. The output is performed according to the time stamp written in TS103.

  The output device 106 outputs the TS 102 input from the descrambler 103 to the memory 12.

  The input device 109 reads data from the memory 12.

  The partial transport stream (PTS) output unit 110 outputs TS 107 read by the input unit 109 as a partial TS 2 to the outside of the transport stream processing apparatus.

  The software transport stream separator 14 includes a service information (SI) replacer 107 and a service information (SI) overwriter 108.

  The service information (SI) replacer 107 combines the program information with the input TS 102 (descrambled transport stream packet TSP). Specifically, a transport stream packet (TSP) including a section necessary for outputting TS 102 as a partial transport stream (PTS) is synthesized. An example of data stored in a necessary section is program information. The synthesized data is output as TS 105 to the memory 12 or the service information (SI) overwrite unit 108.

  The program information stored in the section includes a PAT (program association table), a PMT (program map table), an SIT (selection information table), and a DIT (discontinuity information table).

  The service information (SI) overwrite unit 108 overwrites the data of some or all of the sections (TS 105, TS 103) subjected to the service information (SI) replacement process by the service information (SI) replacement units 107, 104. . As an example of data overwriting, rewriting of only digital recording control data in a digital copy control descriptor, which is one of descriptors included in a PMT (program map table), can be cited as an example. Data on which the service information (SI) is overwritten by the service information (SI) overwrite unit 108 is output to the memory 12 and stored as TS 106.

  The service information (SI) replacing unit 107 and the service information (SI) overwriting unit 108 are configured as software whose processing is executed by the CPU 11.

  The process switcher 15 switches whether the software transport stream separator 14 is disabled or enabled. Specifically, the process switching unit 15 switches the service information (SI) replacement switching flag 111 for switching the service information (SI) replacement unit 107 to invalid / valid and the service information (SI) overwriting unit 108 for switching invalid / valid. A service information (SI) overwrite switching flag 112 is generated. In this specific example, the function of the process switch 15 is realized by the CPU 11.

  The operation of this transport stream processing device will be described below. In the transport stream (TS) input to the transport stream processing apparatus, the head data is detected by the synchronizer 101, and further the transport stream packet (TSP) is extracted. When the transport stream packet (TSP) is extracted, the transport stream packet (TSP) is given time stamp information indicating the arrival time by the synchronizer 101.

  The transport stream packet (TSP) output from the synchronizer 101 is selected by the PID filter 102 into a necessary transport stream packet (TSP) and an unnecessary transport stream packet (TSP). The necessary transport stream packet (TSP) is output as it is from the PID filter 102 as TS102. Unnecessary transport stream packets (TSP) are given a discard log by the PID filter 102 and output from the PID filter 102 as TS102. Further, a replacement log is added by the PID filter 102 to the transport stream packet (TSP) to be replaced by the service information (SI) replacer 104 in the subsequent stage, and is output as TS101.

  TS 101 is descrambled by descrambler 103 and then output as TS 102. The descrambling process is performed only on the scrambled TS101.

  The output destination of the TS 102 output by the descrambler 103 is controlled to be switched according to the setting (valid / invalid) of the service information (SI) replacement switching flag 111. That is, the setting of the service information (SI) replacement switching flag 111 (valid / invalid) switches between valid / invalid processing of the service information (SI) replacement unit 107.

  Furthermore, the output destination of the TS 103 output from the service information (SI) replacer 104 is controlled to be switched according to the setting (valid / invalid) of the service information (SI) overwrite switching flag 112. That is, the setting of the service information (SI) overwrite switching flag 112 (valid / invalid) controls the validity / invalidity of the processing of the service information (SI) overwrite unit 108.

  The service information (SI) replacement switching flag 111 and the service information (SI) overwrite switching flag 112 are set in advance in the transport stream processing apparatus by an operator of the transport stream processing apparatus. The setting is performed by an operator via an input device (input switch, keyboard, etc.) (not shown) provided in the transport stream processing apparatus. The input setting is input to the CPU 11 functioning as the process switching unit 15. The CPU 11 sets a service information (SI) replacement switching flag 111 and a service information (SI) overwrite switching flag 112 based on the input settings.

  Processing in the service information (SI) replacement unit 104 (hardware configuration), the service information (SI) replacement unit 107, and the service information (SI) overwrite unit 108 depending on the combination of the setting states of the flags 111 and 112. Valid / invalid of is set.

There are the following four setting patterns for setting.
First setting / flag 111: invalid, flag 112: invalid In the first setting, the processing of the service information (SI) replacer 104 (hardware configuration) is valid, and the software transport separator 14 (service information (SI ) The processing of the replacement unit 107 and the service information (SI) overwriting unit 108) becomes invalid.

  Therefore, the TS 102 output from the descrambler 103 is input to the service information (SI) replacement unit 104 (hardware). The service information (SI) replacement unit 104 synthesizes a transport stream packet (TSP) including a program information storage section with the input TS 102, and then outputs it to the partial transport stream (PTS) output unit 105 as a TS 103. . A partial transport stream (PTS) output unit 105 outputs the input TS 103 as a partial TS 1 to the outside of the apparatus.

  As described above, in the first setting, the transport stream packet (TSP) is processed only by the hardware transport stream separator 13 (PID filter 102, descrambler 103, service information (SI) replacer 104). Thus, it is output to the outside of the apparatus as a partial TS1.

This setting is effective when the requested transport stream separation process can be sufficiently executed only by the hardware transport stream separation device 13.
Second setting / flag 111: Invalid, flag 112: Valid In the second setting, processing of the service information (SI) replacer 104 (hardware configuration) and processing of the service information (SI) overwrite unit 108 (software configuration) Becomes valid, and the processing of the service information (SI) replacer 107 becomes invalid.

  Therefore, the TS 102 output from the descrambler 103 is input to the service information (SI) replacement unit 104 (hardware). The service information (SI) replacement unit 104 synthesizes a transport stream packet (TSP) including a section in which program information is stored in the input TS 102, and outputs it to the output unit 106 as a TS 103. The output device 106 outputs the input TS 103 to the memory 12.

  In the software transport stream separator 14, the service information (SI) overwrite unit 108 for which processing is enabled reads out the TS 103 from the memory 12 and overwrites data for a part or all of it. As an example of the overwriting process, as described above, there is a rewriting process of digital recording control data in a digital copy control descriptor which is one of descriptors included in a PMT (program map table).

  The service information (SI) overwrite unit 108 outputs the data subjected to the overwrite process to the memory 12 as a TS 106. The input device 109 reads the TS 106 from the memory 12 and outputs the read TS 106 to the partial TS output device 110 as TS 108. The partial TS output device 110 outputs the input TS 108 as a partial TS 2 to the outside of the apparatus.

  As described above, in the second setting, the transport stream packet (TSP) is processed by the hardware transport stream separator 13 (PID filter 102, descrambler 103, service information (SI) replacer 104). Further, the service information (SI) overwrite unit 108 of the software transport stream separation device 14 further performs overwriting processing by software, and then outputs it as a partial TS2 outside the device.

This setting is effective when the requested transport stream separation process is not sufficient for the hardware transport stream separation apparatus 13 alone, and when service information (SI) overwrite processing is additionally requested. is there.
Third setting / flag 111: valid, flag 112: invalid In the third setting, processing of the service information (SI) replacer 107 (software configuration) is enabled, and the service information (SI) replacer 104 (hardware configuration). ) And the service information (SI) overwrite unit 108 (software configuration) are invalidated.

  Therefore, the TS 102 output from the descrambler 103 is input to the service information (SI) replacement unit 107 (software configuration). The service information (SI) replacer 107 synthesizes a transport stream packet (TSP) including a section in which program information is stored in the input TS 102, and then outputs it to the memory 12 as a TS 105. The input device 109 reads the TS 105 from the memory 12 and outputs the read TS 105 as the TS 108 to the partial TS output device 110. The partial TS output unit 110 outputs the input TS 108 as a partial TS 2 to the outside of the apparatus.

  As described above, in the third setting, the transport stream packet (TSP) is processed only by the service information (SI) replacer 107 in the software transport stream separating apparatus 14, and then is transmitted to the outside of the apparatus as a partial TS2. Output.

In this setting, although the required transport stream separation process requires only the service information (SI) replacement process, the service information (SI) replacement unit 104 (hardware configuration) performs the process. This is effective when the service information (SI) replacement unit 107 (software configuration) is more efficient.
Fourth setting / flag 111: valid, flag 112: valid In the fourth setting, processing of all configurations (service information (SI) replacer 107, service information (SI) overwrite unit 108) of the software transport stream separator 14 Becomes valid, and processing of the service information (SI) replacer 104 (hardware configuration) becomes invalid.

  Therefore, the TS 102 output from the descrambler 103 is input to the service information (SI) replacement unit 107 (software configuration). The service information (SI) replacement unit 107 synthesizes a transport stream packet (TSP) including a program information storage section with the input TS 102 and outputs the resultant to the service information (SI) overwrite unit 108 as a TS 105. The service information (SI) overwrite unit 108 overwrites data for some or all of the input information. An example of the overwriting process is as described above.

  The service information (SI) overwrite unit 108 outputs the data subjected to the overwrite process to the memory 12 as a TS 106. The input device 109 reads the TS 106 from the memory 12 and outputs the read TS 106 to the partial TS output device 110 as TS 108. The partial TS output device 110 outputs the input TS 108 as a partial TS 2 to the outside of the apparatus.

  Thus, in the fourth setting, the transport stream packet (TSP) is subjected to the PID filtering process (PID filter 102) and the descrambling process (first descrambler 103) by the hardware transport stream separating apparatus 13. After that, the software transport stream separator 14 (service information (SI) replacement unit 107, service information (SI) overwrite unit 108) further processes. Then, the processed data is output to the outside of the apparatus as a partial TS2.

  In this setting, the requested transport stream separation process requires service information (SI) replacement processing and service information (SI) overwrite processing, and service information (SI) replacement processing is replaced with service information (SI) replacement. This is effective when the service information (SI) replacement unit 107 (software configuration) is more efficient than the unit 104 (hardware configuration).

  Next, the procedure of the transport stream processing method by this transport stream processing apparatus will be described with reference to the flowchart of FIG.

  The operation of the transport stream processing apparatus includes a service information (SI) replacement switching step s204 for switching invalid / valid of the service information (SI) replacement step 1108 as a process switching step s23, and a transport stream separation step by software Service information (SI) replacement step s208 is included as s22.

  The hardware transport stream separation step s21 includes a synchronization step s201, a PID filtering step s202, a descrambler step s203, a service information (SI) replacement step s205, and a partial TS1 output step s207.

  This will be described according to the processing flow. Step s201 is a synchronization step. In this step, the head data of the input transport stream (TS) is detected, and further, the transport stream packet (TSP) is extracted from the input transport stream (TS). To do. At the time of extraction, time stamp information indicating the arrival time is given to the transport stream packet (TSP).

  Step s202 is a PID filtering step. In this step, necessary packets and unnecessary packets are selected from the transport stream packet (TSP), and necessary packets are output as TS 101 as they are. Then, a discard log indicating discarding is added and output as TS101.

  In the PID filtering process, the necessity of a transport stream packet (TSP) is determined based on identification data (PID) given to the packet. Furthermore, in the replacement process, which is a subsequent process, a transport log packet (TSP) that is a replacement process target is assigned a replacement log indicating that it is a replacement target.

  Step s203 is a descrambling step. In this step, first, whether the TS101 is scrambled by reading the transport scramble control (TSC) assigned to the TS101 generated in step s102. Determine whether. When it is determined that the scramble is applied, the scramble of the TS 101 is released (descrambled) and then output as the TS 102. If it is determined that the scramble is not applied, the TS 101 is output as TS 102 without performing any processing, and the process proceeds to step s204.

  Step s204 is a service information (SI) replacement switching step. In this step, the service information (SI) replacement switching flag 111 is determined. When determining that the flag 111 is invalid, the process proceeds to a hardware transport separation step s21 (specifically, step s205). If it is determined that the flag 111 is valid, the process proceeds to step s212.

  Step s205 is a hardware service information (SI) replacement step. In this step, the TS102 descrambled in step s203 is combined with a transport stream packet (TSP) including a program information storage section to create a TS103. Output as. In step s205, the above processing is performed by a hardware configuration.

  In the process of step s205, the transport stream packet (TSP) to which the replacement log is added is replaced with a desired transport stream packet (TSP). The transport stream packet (TSP) to which the discard log is attached is used as a space for replacing the transport stream packet (TSP) including the program information storage section, and the remainder is discarded.

  Step s206 is a service information (SI) overwrite switching step, in which the service information (SI) overwrite switching flag 112 is determined. If it is determined that the flag 112 is invalid, the process proceeds to step s207, which is the final step of the hardware transport stream separation step s21 by hardware. If it is determined that the flag 112 is valid, the process leaves the hardware transport stream separation step s21 and proceeds to step s208.

  Step 207 to which the process proceeds when the flag 112 is determined to be invalid in step s206 is a partial TS1 output step. The TS103 generated in step s205 is set as the partial transport stream 1 (partial TS1) and transported according to the time stamp. Output to the outside of the stream processing device. The time stamp is previously given to the transport stream packet (TSP) in the synchronization step s201. When the processing of step s207 is executed, a series of processing ends.

  On the other hand, step s208, which is shifted when it is determined that the flag 112 is valid in step s206, is a memory storing step. In this step, the TS 103 generated in step s205 is temporarily stored in the memory 12 and the process proceeds to step s209. move on.

  Step s209 is a service information (SI) overwriting step. In this step, the TS 103 is read from the memory 12, and the data is overwritten on a part or all of the section of the read TS 103 to set the TS 106. Generate. Specifically, for example, overwriting is performed only on digital recording control data in a digital copy control descriptor which is one of descriptors included in the PMT. In step s209, this process is performed by a software configuration. After generating the TS 106 in step s209, the process proceeds to step s210.

  Step s210 is a memory storing step. In this step, the TS 105 generated in step s209 is stored in the memory 12 accessible by the CPU 12. The memory storage steps s208 and s210 performed before and after the software service information (SI) overwriting step s209 operate on the CPU 11 so that the service information (SI) overwriting step s209, which is software processing, can be executed. This process temporarily stores the TS 103 and TS 105 in the memory 12 accessible by software.

  Step 211 is a partial TS2 output step. In this step, TS105 stored in the memory 12 is read out, and as a partial transport stream 2 (partial TS2), it is provided outside the transport stream processing apparatus according to the time stamp. Output. The time stamp is previously given to the transport stream packet (TSP) in the synchronization step s201. When step s211 is executed, the series of processing ends.

  On the other hand, step s212, which is executed when the flag 111 is determined to be valid in step s204, is a memory storing step. The TS generated in step s203 is stored in the memory 12 accessible from the CPU 11, and the process proceeds to step s213.

  Step s213 is a service information (SI) replacement step. In this step, a transport stream packet (TSP) including a program information storage section is synthesized with TS102 read from memory 12, and output as TS105. In step s213, this process is performed by a software configuration. After performing step s213, the process proceeds to step s214. The memory storage step s212 performed prior to the software service information (SI) replacement step s213 is software that operates on the CPU 11 so that the service information (SI) replacement step s213, which is software processing, can be executed. This process temporarily stores the TS 102 in the accessible memory 12.

  Step s214 is a service information (SI) overwrite switching step, in which the service information (SI) overwrite switching flag 112 is determined.

  If it is determined in step s214 that the flag 112 is valid, the process of step s209 described above is executed, so that data is overwritten on part or all of the section of TS105 to generate TS106.

  After executing step s209, the process of steps s210 and s211 is further executed to generate partial TS2. Then, the generated partial TS2 is output to the outside of the transport stream processing apparatus. When the process of step s211 is executed, the series of processes is terminated.

  If it is determined in step s214 that the flag 112 is invalid, the process of steps s210 and s211 described above is executed without executing step s209 (software service information (SI) overwriting process) to generate a partial TS2. Then, the generated partial TS2 is output outside the transport stream processing apparatus. When the process of step s211 is executed, the series of processes is terminated.

When each setting described above is performed, the process proceeds as follows in the flowchart of FIG.
First setting ( flag 111: invalid, flag 112: invalid)
Start → Step s201 → Step s202 → Step s203 → Step s204 (determination of invalidity of flag 111) → Step s205 → Step s206 (determination of invalidation of flag 112) → Step s207 → End
Second setting ( flag 111: invalid, flag 112: valid)
Start → Step s201 → Step s202 → Step s203 → Step s204 (determination of flag 111) → Step s205 → Step s206 (determination of flag 112) → Step s208 → Step s209 → Step s210 → Step s211 → End
Third setting ( flag 111: valid, flag 112: invalid)
Start → Step s201 → Step s202 → Step s203 → Step s204 (valid determination of flag 111) → Step s212 → Step s213 → Step s214 (determination of invalidity of flag 112) → Step s210 → Step s211 → End
Fourth setting ( flag 111: valid, flag 112: valid)
Start → Step s201 → Step s202 → Step s203 → Step s204 (Validity determination of flag 111) → Step s212 → Step s213 → Step s214 (Validity determination of flag 112) → Step s209 → Step s210 → Step s211 → End Two types of service information (SI) replacement processing are performed by outputting a partial TS1 that has undergone hardware service information (SI) replacement processing and a partial TS2 that has undergone another service information (SI) replacement processing by software. (Replacement + Overwrite) Implementation of outputting executed partial transport stream (PTS) is a hardware service information (SI) replacer This is possible without any addition.

It is a block diagram which shows the whole structure of the transport stream processing apparatus which concerns on embodiment of this invention. It is a flowchart in an embodiment. It is a block diagram of a stream packet. It is a block diagram which shows the basic composition of the transport stream processing apparatus of this invention. It is a process flowchart in the basic composition of the transport stream processing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hardware transport separator 6 State judgment device 11 CPU 12 External memory 14 Software transport separator 15 Process switching device 101 Synchronizer 102 PID filter 103 Descrambler
104 Service Information (SI) Replacer 105 Partial TS Output Unit 106 Output Unit 107 Service Information (SI) Replace Unit 108 Service Information (SI) Overwrite Unit 109 Input Unit 110 Partial TS Output Unit

Claims (11)

A transport stream processing apparatus that separates desired data from a transport stream (TS) by executing a plurality of processes,
A hardware transport stream separator that executes a part of the plurality of processes in a hardware configuration;
A software transport stream separator that performs the remaining processes of the plurality of processes not performed by the hardware transport stream separator in a software configuration;
A process switcher for switching whether or not the remaining process is executed by the software transport stream separator;
A transport stream processing apparatus comprising: The remaining process is a service information (SI) overwrite process for overwriting a part or all of a section included in the packet (TSP) of the transport stream.
The transport stream processing apparatus according to claim 1. A processor in which the software transport stream separator operates as software;
A memory accessible by software running on the processor;
Further comprising
The hardware transport stream separator includes a first output device, an input device, and a second output device,
The first output unit includes the plurality of processes to be processed by the software transport stream separator when the processing switch instructs the execution of the remaining processing by the software transport stream separator. Data in the middle of processing (hereinafter referred to as data in the middle of processing) is read and stored in the storage device,
The software transport stream separator reads the in-process data stored in the storage device when the processing switch instructs the execution of the remaining processing by the software transport stream separator. After the remaining processing is performed, the processed data is stored in the storage device,
The input device reads the processed data stored in the storage device from the storage device when the processing switch instructs the execution of the remaining processing by the software transport stream separator And
The second output device outputs the processed data read from the storage device by the input device as output data of the transport stream processing device.
The transport stream processing apparatus according to claim 1. The hardware transport stream separator is configured to execute each of the plurality of processes,
A synchronizer for retrieving data from the transport stream (TS) in units of transport stream packets (TSP);
A PID filter that performs PID filtering on the transport stream packet (TSP) extracted in packet units by the synchronizer based on identification data (PID);
A descrambler for descrambling the PID filtered transport stream packet (TSP);
A transport stream packet (TSP) necessary for outputting the descrambled transport stream packet (TSP) as a partial transport stream (PTS) is created, and the descrambled transport stream packet (TSP) Service information (SI) replacer to be combined with
With
The software transport stream separator is a service information (SI) overwrite unit for overwriting and outputting a part or all of a section included in a transport stream packet (TSP) output from the service information (SI) replacer. With
The processed data output by the second output device is an output of the service information (SI) overwrite device.
The transport stream processing apparatus according to claim 3. The processing switching unit includes a service information (SI) overwrite switching flag that is flagged by an operator of the transport stream processing apparatus. When the service information (SI) overwrite switching flag is valid, the service information (SI) SI) Instructs execution of the operation of the overwrite device, and instructs non-execution of the operation of the service information (SI) overwrite device when invalid.
The transport stream processing apparatus according to claim 4. A transport stream processing method for separating desired data from a transport stream (TS) by executing a plurality of processes,
A hardware transport stream separation step for executing a part of the plurality of processes in a hardware configuration;
A software transport stream separation step for executing the remaining processes of the plurality of processes not performed by the hardware transport stream separation step in a software configuration;
A process switching step for switching whether or not the remaining process is executed by the software transport stream separation step;
A transport stream processing method including: The remaining process is a service information (SI) overwrite process for overwriting a part or all of a section included in the packet (TSP) of the transport stream.
The transport stream processing apparatus according to claim 6. The hardware transport stream separation step includes a first storage step, a read step, and an output step;
The software transport stream separation step includes a remaining process execution step and a second storage step,
In the first storage step, when the execution of the remaining processing by the software transport stream separation step is instructed in the process switching step, the plurality of software transport stream separation steps are processing targets. It is a step of reading out data during processing (hereinafter referred to as data during processing) and storing it in a storage device,
When the processing switching step instructs the execution of the residual processing by the software transport stream separation step, the residual processing execution step reads out the intermediate processing data stored in the storage device and A step that performs the rest of the processing,
The second storage step is a step of storing the processed data of the remaining processing execution step in the storage device,
The reading step is a step of reading the processed data stored in the storage device when the processing switching step instructs execution of the remaining processing by the software transport stream separation step,
The output step is a step of outputting the processed data read from the storage device as output data of the transport stream processing method.
The transport stream processing method according to claim 6. The plurality of processing steps include:
A synchronization step of retrieving data from the transport stream (TS) in units of transport stream packets (TSP);
A PID filtering step of PID filtering the transport stream packet (TSP) based on identification data (PID);
A descrambling step for descrambling the PID filtered transport stream packet (TSP);
A transport stream packet (TSP) necessary for outputting the descrambled transport stream packet (TSP) as a partial transport stream (PTS) is created, and the descrambled transport stream packet (TSP) Service information (SI) replacement step to be combined with
Including
In the software transport stream separating step, a service information (SI) overwriting step of overwriting and outputting a part or all of a section included in the transport stream packet (TSP) processed in the service information (SI) replacing step. Including
The processed data output by the output step is an output of the service information (SI) overwriting step.
The transport stream processing method according to claim 8. As a pre-process to be performed before the execution of the plurality of processes, further includes a step of setting a flag of the switching flag based on an operation of an operator,
The process switching step instructs execution of the residual processing by the software transport stream separation step when the switching flag is valid, and the residual processing by the software transport stream separation step when invalid. Instructing the non-execution of the
The transport stream processing method according to claim 9.   A digital broadcast receiver comprising a tuner for receiving a digital broadcast including a transport stream (TS) and the transport stream processing device according to claim 1.

Images