KR101141644B1 - Apparatus and Method of PSI converting - Google Patents

Abstract

The present invention relates to a PSI conversion apparatus and method. The present invention provides a PAT converter for removing the information of the remaining programs, leaving only the program information selected by the user, for converting the program information of the processed transport stream for storage and retransmission, and the stream among the streams included in the selected program. Provided is a PSI conversion apparatus including a PMT converter that leaves only the information of a stream to be stored or retransmitted and removes the rest. Therefore, according to the present invention, the program information in the processed transport stream for storage and retransmission reflects the contents of the processed transport stream, thereby effecting the function of a normal transport stream.

PSI, System Decoder, Transport Packet, PAT, PMT

Description

Apparatus and Method of PSI converting

1 is a view showing the configuration of a transport packet according to the ISO / IEC 13818-1 standard

2 is a diagram illustrating a configuration of a system decoder for decoding a transport packet according to the prior art.

3 shows a general section data structure.

4 to 5 are views showing the contents of A and B in the PAT section and the PMT section, respectively.

6 is a diagram illustrating a configuration of a system decoder according to the present invention.

7 to 8 illustrate the contents stored in buffer 0 and buffer 1 and the final output result according to the present invention.

-Explanation of symbols for the main parts of the drawings-

100: buffer 0 200: PID filter

300: section filter 400: transport packet decoder

500: Buffer 1 600: PSI Converter

700: Multiplexer 0 800: Multiplexer 1

The present invention relates to a system decoder, and more particularly, to an apparatus and method for PSI conversion to reflect the contents of the processed transport stream when processing the transport stream for storage and retransmission.

Recently, the digital TV broadcast receiving apparatus has been developed into various application forms using a storage medium as well as a basic broadcast receiving function. In addition, by using a network function such as IEEE 1394 or Ethernet, it also provides a near-field retransmission function.

In general, ISO / IEC 13818-1 based on the transmission standard for digital TV broadcasting provides various elements suitable for broadcasting, and program specific information (PSI) is one of them.

The actual broadcast service uses a separate standard based on ISO / IEC 13818-1, which includes the Advanced Television System Committee (ATSC) in Korea and North America, Digital Video Broadcasting (DVB) in Europe, and ARIB in Japan. Various standards are used, such as digital BS / CS, called the Association of Radio Industries and Business.

In addition to the PSI defined in ISO / IEC 13818-1, the program information further defines and uses a standard called PSIP (Program and System Information Protocol) or SI (System Information).

However, since any standard includes the PSI defined in ISO / IEC 13818-1, a basic stream of audio and video can be received as long as the transport stream complies with the standard.

Meanwhile, in digital TV, time-division multiplexing of digitally encoded audio, video, and other broadcasting data streams is reconstructed into a transport stream and then transmitted. In ISO / IEC 13818-1, for multiplexing, first, each audio, video, and other broadcasting data stream is divided into transport packets having a size of 188 bytes, and each packet has a PID (Packet IDentifier) given for each stream. This is shown in Figure 1 attached.

As shown in FIG. 1, fields for various uses are defined in the transport packet in addition to the above-described PID, which are largely allocated to a 4-byte header including an PID, an adaptation field, and data to be actually transmitted. It is divided into payloads.

The adaptation field is variable in length, as well as several optional fields, especially stuffing bytes for filling the empty space of the packet.

The configuration of a system decoder for decoding such a transport packet is shown in FIG.

FIG. 2 is a block diagram showing the configuration of a general system decoder. As shown in FIG. 2, the system decoder has a buffer 0 (10) at an input terminal to store an externally input transport packet.

Among the transport packets stored in the buffer 0 (10) it is determined whether to transmit or discard the packet to the next step, the PID filter 20 performs this.

That is, if the PID filter 20 is set appropriately and the packets are collected for each PID, it is possible to separate the transport packets belonging to the original audio, video, and other broadcasting data streams, and this is again performed by the transport packet decoder 40 of the next stage. Decoding at will restore the original stream before multiplexing.

Meanwhile, the above-described PSI is data indicating how elements such as audio and video constitute a specific program in a transport stream. These are defined in the form of a table, and representative ones are a program association table (PAT) and a program map table (PMT).

The PSI is also transmitted in the form of a transport packet like a normal video or audio stream. At this time, unlike the audio or video stream is made in a packetized elementary stream (PES) form and then dividedly transmitted in a transport packet, a PSI table such as PAT or PMT uses a data structure called a section.

The section may be included in one transport packet, which is shown in FIG.

As shown in FIG. 3, the pointer_field in the section data structure indicates the position of the first byte of the first section that starts anew in the transport packet transmitting the section. In addition, after one section is completed, a new section may be started or 'FFh' may be used to fill the remaining space of the transport packet, which is referred to as a stuffing byte as in the aforementioned adaptation field.

The internal structure of the section is different from that for PAT and PMT. In the section structure shown in FIG. 3, A and B indicate parts that vary depending on the table. In particular, B represents a part belonging to the actual table.

4 to 5 are diagrams showing the contents of the A and B in the PAT section and the PMT section, respectively.

First, portions A and B in FIG. 4 are included in the section of FIG. 3 to configure a PAT, and may include a plurality of unit information having a 16-bit program_number field and a 13-bit program_map_PID field.

The PID of the transport packet including the PAT and the table_id of the section carried in the packet are both fixed to '0'.

The program_map_PID is a PID of a transport packet including a program definition identified by program_number. In this case, the definition of the program means a corresponding relationship between a program number (program_number) and the elements constituting the program, and the table composed of such program definitions is a PMT.

Parts A and B in FIG. 5 are included in the section of FIG. 3 to configure the PMT, and may include a plurality of unit information having an 8-bit stream_type, a 13-bit elementary_PID, and a variable length descriptor.

The PMT includes all program definitions carried in a transport stream, and may be loaded on one PID or multiple PIDs. Therefore, table_id is fixed at '2', but the PID is not fixed.

Normally, the section_number field is used to identify several sections that constitute one table. However, in the case of PMT, the section_number of all sections constituting the table is set to '0', and each section is identified by the program_number field. That is, one section is allocated per program_number and no program definition can be divided into two or more sections.

In general, when the system decoder described above in FIG. 2 extracts PSI information from the transport stream, hardware separates the sections containing the PSI information and delivers them to the software, and the software gathers these sections to reconstruct the PSI table. After that, it finds out the structure of the program included in the corresponding transport stream.

In other words, it is to find out which program is being transmitted and what is the PID of the audio and video streams that make up the program.

To this end, first, the PID filter 20 of FIG. 2 is set to extract a packet having a PID of '0'. The packet having the PID of '0' is transmitted to the section filter 30 via the transport packet decoder 40, where the sections having the table_id of '0' are transmitted to the external memory.

The CPU, ie, the software, restores the PAT by referring to the contents of the memory. After that, a specific program_number is selected in the PAT, and the PID of the packet having the definition of the program, that is, program_map_PID, is found in the PAT and set in the PID filter 20.

The packet thus obtained is sent to the section filter 30 via the transport packet decoder 40. Here, only the section whose table_id is '2' and program_number is a value previously selected by the PAT is extracted and transmitted to the external memory.

The section includes a program definition corresponding to the previously selected program among all PMTs, and the software separates the PIDs of the audio and video streams necessary for the program, that is, the elementary_PIDs constituting the program.

When the PIDs are set in the PID filter 20, transport packets constituting the corresponding audio and video streams are extracted. The transport packets are made into a PES through the transport packet decoder 40 and then demultiplexed by PID and transmitted to each audio or video decoder.

When the transport stream is stored after passing through the PID filter 20 or retransmitted to an external device, the transport stream passes through the buffer 1 50 of FIG. 2.

Accordingly, the transport packet extracted from the original stream is stored in the buffer 1 50. In order to form a normal transport stream, the packet including the PSI table must also be stored.

As described above, the PSI includes a table having information on programs carried in a transport stream, that is, a PAT, and a table having information on elements constituting each program, that is, a PMT. It must accurately describe the information in the port stream.

Meanwhile, the process of creating a partial transport stream through the PID filter 20 from the received transport stream may result in that the PSI included in the original transport stream does not match the content of the partial transport stream. .

For example, assuming that the original transport stream includes four programs A, B, C, and D, and the A program includes one video and three audio streams, If you store only the video and the first audio stream of the A program, the resulting partial transport stream contains only some of the streams specified in the PSI (one video and one audio stream), so the contents of the PSI are not correct.

Therefore, when the original PSI is included in the partial transport stream as it is, the PSI cannot function properly as program information.

In order to solve this problem, when the transport stream is processed for the purpose of storing or retransmitting to make a partial transport stream, the above-described PAT and PMT must be modified together.

That is, the system decoder should be able to provide both the original PSI table and the converted PSI table. The original PSI table is initially for software to analyze the program information, and the converted table is for outputting when selecting and storing or retransmitting only some streams in the PSI table.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a correct PSI when creating a partial transport stream for storing or retransmitting a transport stream conforming to ISO / IEC 13818-1. It relates to an apparatus and a method for converting to have.

In order to achieve the above object, the present invention provides a PAT converter for removing program information selected by a user, leaving only program information selected by a user, for conversion of program information of a processed transport stream for storage and retransmission; Provided is a PSI conversion apparatus including a PMT converter that leaves only the information of the stream to be stored or retransmitted and removes the rest of the streams included in the program.

The PAT converter may include a PROG_NUM register referring to a program_number field for selecting a program.

The PMT converter includes an ES_MASK register for selecting stream information to be stored or retransmitted.

And a section length converter for correcting the section length changed by the PAT converter and the PMT converter.

The section length converter includes a SEC_LEN_PTR register for setting the address of the senction_length field, a SEC_LEN count register for counting the size of the section, and a SKIP_LEN register for accumulating the size of the free area generated during the conversion of the transport packet. Characterized in that.

And an AF converter for processing the empty space from which the information is removed by the PAT converter and the PMT converter as stuffing bytes of the adaptation field.

The apparatus may further include a CRC 32 generator for newly generating a CRC value for the modified section.

The present invention relates to a method of converting program information of a transport stream processed for storage and retransmission, comprising the steps of removing information of a remaining program, leaving only program information selected by a user; Leaving only the information of the stream to be stored or retransmitted and removing the rest, correcting the section_length field changed according to the removing step, and treating the empty space from which the information has been removed as a stuffing byte of the adaptation field; A PSI conversion method is provided.

The stuffing byte processing step of the adaptation field may include: writing an empty space from which the information has been removed to advance the next data in a transport packet, and writing the remaining space after all data of the transport packet has been processed. It characterized in that it comprises a step of processing.

The method may further include modifying the adaptation_field_control field according to the change of the adaptation field.

Therefore, according to the present invention, the program information in the processed transport stream for storage and retransmission reflects the contents of the processed transport stream, thereby effecting the function of a normal transport stream.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

In addition, the term used in the present invention was selected a general term that is widely used at present, but according to the emergence of a new technology, the term that the applicant deemed most appropriate in the present invention was arbitrarily used, and the meaning of the term in the corresponding description. It will be explained clearly. Therefore, in the understanding of the present invention, it is intended that the present invention should be understood as the meaning of terms rather than simple names of terms.

6 is a diagram illustrating a configuration of a system decoder according to the present invention.

As shown in FIG. 6, the system decoder according to the present invention has a form in which the PSI converter 600 is added to the system decoder as shown in FIG. 2. For this purpose, the multiplexer 0 (700) and the multiplexer 1 (800) are used. Include.

The PSI converter 600 may include a program association table (PAT) converter 611, a program map table (PMT) converter 613, a section length converter 615, an adaptation field (AF) converter 621, and a CRC converter 623. It is configured to include).

First, in order to convert a PAT through the PAT converter 611, a register for selecting a program is required.

That is, the PAT converter 611 removes only the program information selected by the user and removes the information of the remaining programs. For this purpose, a register for selecting a program is required.

As such, in order to identify a program in the PAT, a 16-bit program_number field in the PAT illustrated in FIG. 4 is used. For this purpose, a 16-bit PROG_NUM register is placed in the PAT converter 611 as shown in FIG. 6.

That is, the PAT may be divided into several sections, and since there is no provision that a plurality of sections constituting one table must come in order, only the order in which each information is located in the section or table can provide desired information. I can't identify it. Therefore, you must refer directly to the program_number field.

On the other hand, in the case of the PMT, since all elements constituting a specific program are included in one section constituting the PMT, it is convenient to identify each information in the order in which the information is located.

That is, if bits 0 through 15 are mapped to 16 stream information from the first elementary_PID to the 16th elementary_PID in the PMT using a 16-bit register, whether or not to remove sequentially decoded stream information when processing the section is determined. You can look at the bits and decide.

Accordingly, the PMT converter 613 leaves only the information of the stream to be actually stored or retransmitted among the streams included in the selected program and removes the rest.

The register performing this role is the ES_MASK register located in the PMT converter 613 of FIG.

On the other hand, PSI conversion consists of a first step of reading a transport packet including PAT from buffer 0 (100) and writing to buffer 1 500, and a second step of reading data from buffer 1 (500) and outputting it. .

That is, blocks designated by reference numeral 610 in FIG. 6 are blocks for the first step process, and blocks designated by reference numeral 620 are blocks for the second step process.

The buffer 0 100 is used to transmit externally input data to each device in the system decoder, and the buffer 1 500 is a buffer for temporarily storing data for storage and retransmission.

In this case, the general PES that is not the PSI data is processed in the same manner as the system decoder of FIG. 2. That is, it is sent to the buffer 1 100 without any processing, which is controlled by the multiplexer 0 700.

At this time, the PID filter 200 generates a signal indicating whether the packet being processed is PSI or PES, and transmits the signal to the PSI converter 600. The PSI converter 600 based on the signal and the internal state of the PSI converter 600. Determine the output of the multiplexer 0 (700).

In more detail, when a packet having a PID of 0, that is, a section including a PAT is stored in the buffer 0 (100), the PID filter 200 informs the PSI converter 600 of this.

According to the signal, the internal PAT converter 611 of the PSI converter 600 reads data from the buffer 0 (100) immediately before the table starts from the beginning of the transport packet, that is, until the portion indicated by B in FIG. Control multiplexer 0 700 to store in buffer 1 500.

Subsequently, when reading the table indicated by B in FIG. 3, only data corresponding to a value set in the internal PROG_NUM register is read. That is, data corresponding to program_number other than the value set in the internal PROG_NUM register is not read, and instead, the length corresponding to the portion is added to the SKIP_LEN register of the section length converter 615.

In the PAT, since each program information occupies a 4-byte area including a 16-bit program_number and a 13-bit program_map_PID, the role of the PAT converter 611 reads 4 bytes corresponding to the selected program_number. In other cases, the process skips 4 bytes and instead adds 4 bytes to the SKIP_LEN register of the section length converter 615.

In addition, if the size of the section is changed while processing the section as described above, the section_length field of the section header should also be modified to the changed size.

To this end, when data is transferred from buffer 0 (100) to buffer 1 (500), if the data read from buffer 0 (100) is a section_length field, the address at which the data is written to buffer 1 (500) is converted to a section length converter ( 615) to the SEC_LEN_PTR register.

The SEC_LEN count register starts counting from this time until the end of the section, that is, counts until the CRC 32 field is stored in buffer 1 500. When the section is complete, the value of the SEC_LEN register is written to the location indicated by the SEC_LEN_PTR register, and reset to '0' for processing of the next section.

After the processing of the transport packet is completed through the above process, all the size of the empty area generated in the process is accumulated in the SKIP_LEN register of the section length converter 615, which is the final value of the transport packet in the second step. It is used by the AF converter 621 to correct the adaptation field when it is read for output. The value of the STUFF_LEN register is copied to the STUFF_LEN register of the AF converter 621 when the processing of the transport packet is completed, and the SKIP_LEN register is reset to '0' for processing of the next packet.

PMT conversion, on the other hand, begins with the filtering of the program_number field in the section header. The PMT is divided into several sections. Since one section is assigned to one program, such a method is effective to find a section including information of a desired program.

Normally, only one section corresponding to one program_number is included in one packet. However, since all program information may be contained in one packet, it is safe to extract information of a desired program in this manner.

This is the same as the section filter 300 generally performs. The PSI converter 600 can read only the section corresponding to the program_number set in the PROG_NUM register in the transport packet stored in the buffer 0 (100).

To do this, first of all, instead of reading from the beginning of the section, the part indicated by A in FIG.

Data other than the section corresponding to the progam_number is skipped and instead only the length of the data is added to the SKIP_LEN register of the section length converter 615.

The data of the section corresponding to the program_number needs to be modified because only the information of the stream to be included in the actual storage or retransmission must be selected among the streams included in the program.

To do this, the contents of the PMT are sequentially compared with a value set in the ES_MASK register to determine whether to remove the PMT.

For example, if bit 1 of the ES_MASK is set to '1', it means that information about a second stream of streams included in the program is removed. The information to be removed is added to the SKIP_LEN register without adding data to the buffer 1 as in the PAT processing.

Unlike in the above-described PAT, the unit information has a fixed size of 4 bytes. In the case of the PMT, the length of information about one stream is not constant. This is because the descriptor is included in the information about each stream.

The descriptor starts with 1 byte descriptor_tag for identifying the type and 1 byte descriptor_length indicating the size of the descriptor. The size of the decriptor is variable and is indicated in descriptor_length.

Therefore, when obtaining the value of each SKIP_LEN register, the size of the descriptor should be added to 3 bytes from stream_type to elementary_PID included in the information of the corresponding stream.

When the end of the transport packet stored in the buffer 0 (100) is reached, the value of the SKIP_LEN register is transferred to the STUFF_LEN register as in the PAT processing and reset to '0' for processing the next packet.

In addition, the value of the SEC_LEN counter register is updated to have a size of a new section obtained by removing unnecessary data while reading each section as in the case of PAT processing.

When a section_length field is found when reading a section from the buffer 0 (100), the address of the buffer 1 500 corresponding to the position is stored in the SEC_LEN_PTR register, from which the SEC_LEN counter register starts counting.

After that, when the last data of the section is stored in the buffer 1 500, the value of the SEC_LEN counter register is written to the address indicated by the SEC_LEN_PTR register.

Through the above process, the contents of the table and the section_length field are corrected, and the value of the SKIP_LEN register to be used for correcting the adaptation field is obtained.

Thereafter, two steps are finally corrected when the transport packet is read from the buffer 1 500 for output.

First, the AF converter 621 immediately corrects the adaptation field after outputting the transport packet header. According to the ISO / IEC 13818-1 standard, as shown in FIG. 1, stuffing bytes having a value of 'FFh' may be located at the end of the adaptation field, by using the header and payload of the transport packet. It fills in areas outside the area it occupies.

In other words, when the payload decreases, the stuffing byte of the adaptation field is added to adjust the size of the entire packet to 188 bytes.

In addition, in the case of the packet including the PSI, as described above, there is a method of filling the remaining portion of the packet with stuffing bytes after the end of the section, but it cannot be used when the section is not completed in the packet and continues to the next packet. Therefore, the empty space generated as a result of the PSI conversion utilizes an adaptation field.

The adaptation field starts with one byte of adaptation_field_length and is followed by data equal to the number of bytes specified in the adaptation_field_length. The second byte is a flag byte of one byte. Each bit serves as an indicator like discontinuity_indicator or indicates whether a specific field exists.

That is, if the PCR_flag is '1', the PCR field is followed by the flag byte, and if the PCR_flag is '0', the PCR field is not present.

In this case, the adaptation_field_length is '0', which is a special case in which the adaptation field includes only the adaptation_field_length field. In addition, when adaptation_field_length is '1', only up to the flag byte exists, and all the flags in the flag byte are '0'. That is, there is no selection field indicating whether the flag byte exists.

In the second step, if the value of the STUFF_LEN register is not 0, the section length is reduced in the process of modifying the PSI. Therefore, if the adaptation field already exists in the packet being processed, the transport packet is output and then the adaptation field is expanded. If the adaptation field is not present, the adaptation field is newly inserted after the transport packet is output. In particular, when a new adaptation field is inserted, the value of the adaptation_field_control field included in the fourth byte of the transport packet header should be modified and output. The adaptation_field_control field consists of 2 bits, of which the higher bits indicate the presence of an adaptation field. In the case of newly inserting the adaptation field, it is necessary to modify the original value of '0' to '1' to indicate that the adaptation field exists.

In order to correct the adaptation field, first, the adaptation_field_length located at the beginning of the adaptation field is read from the buffer 1 500, and is increased by a value set in the STUFF_LEN register.

Next, the buffer 1 500 sequentially outputs original data of the adaptation field (including stuffing byte if it is already included). Although the payload of the transport packet is located immediately after the adaptation field in the buffer 1 500, the AF converter 621 first outputs the required number of stuffing bytes instead of outputting the payload.

At this time, if the original adaptation_field_length is '0', the number of added stuffing bytes is (STUFF_LEN-1), and otherwise, STUFF_LEN.

FIG. 7 illustrates the contents stored in the buffer 0 and the buffer 1 and the final output result according to the present invention, and shows a case where there is no adaptation field.

 7 (a) shows the contents of packets stored in buffer 0 (100), and the information to be removed in buffer 0 (100) is removed according to the method described above, and as shown in (b) of FIG. Stored at 500.

Thereafter, the packet length is adjusted using the adaptation field and then output. When the adaptation field does not exist, as shown in FIG. 7, the adaptation field is newly inserted.

To this end, when STUFF_LEN in the AF converter 621 is '1', that is, when an adaptation field having a length of 1 byte is required, '0' may be output to insert an adaptation field having only adaptation_field_length as described above.

When the STUFF_LEN is '2', that is, when an adaptation field having a 2-byte length is required, '1' and '0' may be sequentially output to insert an adaptation field having only an adaptation_field_length and a flag byte.

When the STUFF_LEN is greater than '2', that is, the adaptation field longer than 2, the output of the (STUFF_LEN-1) in the adaptation_field_length, '0' in the flag byte in turn, and then the stuffing bytes of (STUFF_LEN-2).

After all of the adaptation fields are output by the AF converter 621, the rest of the data (payload of the transport packet) is read and output.

Therefore, as shown in FIG. 7C, the adaptation field is extended by the removed empty space of the packet, and the remaining data is output.

FIG. 8 illustrates contents stored in buffer 0 and buffer 1 and a final output result according to the present invention, and shows an case where an adaptation field is inserted in a transport packet.

As shown in FIG. 8, when the adaptation field is inserted in the transport packet, the inserted adaptation field is extended and used as much as the empty space generated during the conversion process.

In this case, after outputting (STUFF_LEN-1) as the adaptation_field_length and '0' as the flag byte, the stuffing bytes of (STUFF_LEN-2) are output.

Then, the final output result as shown in FIG. 8C is obtained by reading and outputting the remaining data.

On the other hand, the data up to immediately before the last CRC 32 value in each section is output as it is read from the buffer 1 (500), and at the same time passes through the CRC 32 generator 623 to generate a new CRC 32 value for the section.

The value is output instead of the CRC 32 value located at the end of the section in buffer 1 500. That is, since the original value stored in the buffer 1 500 is a value obtained for the content before the PSI modification, it does not match the CRC 32 value for the newly modified content, and thus is newly generated.

All the above processes can be controlled by setting PROG_NUM register and ES_MASK register in software, and the remaining SEC_LEC_PTR, SEC_LEN, SKIP_LEN, STUFF_LEN, and CRC 32 registers are set in hardware during internal operation.

The PROG_NUM register and the ES_MASK register may be reset according to the contents of each table when a PAT or PMT is newly generated.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The effects of the PSI conversion apparatus and method according to the present invention described above are as follows.

First, program information in a processed transport stream for storage and retransmission reflects the contents of the processed transport stream, thereby effecting the function of a normal transport stream.

Second, since the conversion process of the program information can be controlled by only a few registers, the software load is reduced.

Third, there is no significant increase in hardware cost by constructing a PSI converter without adding a buffer, and there is an effect in that the hardware structure is not changed significantly by adding a function to a conventional system decoder.

Claims (11)

In the PSI converter of the transport stream processed for storage and retransmission, A PAT converter leaving only selected program information and removing information of the remaining programs; A PMT converter that leaves only the information of the stream to be stored or retransmitted and removes the rest of the streams included in the selected program; And And a section length converter for correcting a section length changed by the PAT converter and the PMT converter. The method of claim 1, The PAT converter, A PROG_NUM register referring to the program_number field for selecting a program; PSI conversion device comprising a. The method of claim 1, The PMT converter, An ES_MASK register for selecting stream information to be stored or retransmitted; PSI conversion device comprising a. delete The method of claim 1, The section length converter, a SEC_LEN_PTR register for setting an address of the senction_length field; A SEC_LEN count register for counting the size of the section; And A SKIP_LEN register for accumulating the size of the empty area generated during the conversion of the transport packet; PSI conversion device comprising a. The method of claim 1, An AF converter for processing the empty space from which the information is removed by the PAT converter and the PMT converter as stuffing bytes of an adaptation field; PSI conversion device further comprising. The method of claim 1, A CRC 32 generator for generating a new CRC value of the section changed by the PAT converter and PMT converter; PSI conversion device further comprising. In the PSI conversion method of the processed transport stream for storage and retransmission, Removing information of the remaining programs leaving only the selected program information; Removing only the information of the stream to be stored or retransmitted from the stream included in the selected program and removing the rest; Correcting the section_length field changed according to the removing step; And Treating the empty space from which the information is removed as a stuffing byte of an adaptation field; PSI conversion method comprising a. The method of claim 8, Stuffing byte processing step of the adaptation field, Recording the empty space from which the information has been removed by advancing the next data in the transport packet; And Processing the last remaining space as the stuffing byte after all data in the transport packet has been processed; PSI conversion method comprising a. The method of claim 8, Generating a new CRC code of the section changed by the removing step; PSI conversion method further comprising. The method of claim 8, Modifying the adaptation_field_control field according to the change of the adaptation field; PSI conversion method further comprising.

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