JP2001167528A - Device and method for recording transport stream, device and method for reproducing transport stream, program recording medium and data recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently record/reproduce a transport stream. SOLUTION: A TP-extra-Header of 4 bytes is added to a transport packet of 188 bytes, and a source packet is generated, and 32 pieces of the source packets of 192 bytes are collected, and an aligned unit equivalent to a data information amounts (6144 bytes) of 3 sectors parts is generated, and the information is recorded/reproduced on a data recording medium with in the aligned unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transport stream recording apparatus and method, a transport stream reproducing apparatus and method, a program recording medium, and a data recording medium, and more particularly, to a transport transmitted as a digital multi-channel broadcast signal. The present invention relates to a transport stream recording apparatus and method, a transport stream reproducing apparatus and method, a program recording medium, and a data recording medium suitable for recording and reproducing a stream on a data recording medium.

[0002]

2. Description of the Related Art MPEG (Moving Pilot) is used for digital satellite broadcasting and digital terrestrial broadcasting in Japan, Europe and the United States.
cture Experts Group) 2 transport stream. The transport stream includes MPEG video packets and MPEG corresponding to the video and audio of the program.
Audio packets are time division multiplexed. The data length of one transport packet is 188 bytes.

If a transport stream corresponding to a program can be recorded in the form of a digital signal on the receiving side, a high-quality AV program can be repeatedly viewed at any time without any deterioration in image quality or sound quality. Becomes

[0004] If a transport stream corresponding to a program is recorded on a randomly accessible data recording medium such as a hard disk or an optical disk, for example, random access reproduction with high responsiveness to a user command is possible. Is realized.

[0005]

By the way, data recording media that can be randomly accessed, such as hard disks and optical disks, are usually provided with a FAT (File Allocation Table) or a UD.
Based on a file system such as F (Universal Disk Format), data is formatted in units of 2048-byte logical blocks called sectors, and data is read and written there.

Therefore, in order to realize random access reproduction with high responsiveness, it is necessary to record AV data included in the transport stream in sector units (or in integral multiples of sectors). In addition, since a transport packet is 188 bytes and a sector is 2048 bytes, compatibility between the two is not good. At present, AV data included in a transport stream is transferred in units of sectors (or sectors). There was a problem that it was not possible to record in integer multiples.

Further, even if AV data can be recorded in sector units (or in integral multiples of sectors), address management of the recorded AV data is troublesome in order to realize random access reproduction with high responsiveness. There was an issue.

The present invention has been made in view of such a situation, and generates a source packet by adding a 4-byte transport extra header (TP_extra_header) to each transport packet.
By providing an aligned unit (Aligned unit) corresponding to a data amount of three sectors as a new data unit collectively for each unit, a transport packet can be efficiently recorded and reproduced. Things.

[0009]

A first transport stream recording apparatus according to the present invention comprises header adding means for adding a header to a transport packet constituting a transport stream to generate a source packet, It is characterized by including generating means for collecting aligned units and generating aligned units, and recording means for recording the aligned units on a data recording medium.

[0010] A first transport stream recording apparatus of the present invention includes a counting means for counting the number of transport packets constituting a transport stream, and a null for generating a null packet in accordance with the count value of the counting means. And a packet generating unit.

According to a first transport stream recording method of the present invention, a header adding step of adding a header to a transport packet constituting a transport stream to generate a source packet, and collecting the source packets for each predetermined number And a recording step of recording the aligned unit on a data recording medium.

[0012] The program of the first program recording medium of the present invention includes a header adding step of adding a header to a transport packet constituting a transport stream to generate a source packet, and collecting the source packets by a predetermined number. And a recording step of recording the aligned unit on a data recording medium.

A second transport stream recording apparatus according to the present invention includes a header adding means for generating a source packet by adding a header to a transport packet constituting a transport stream, and classifying the source packet into a predetermined number. And a recording unit for recording the aligned unit on a data recording medium, wherein the data amount of the aligned unit is equal to the data amount recordable in one sector of the data recording medium. It is characterized by being equal to an integral multiple.

[0014] A second transport stream recording apparatus of the present invention comprises a counting means for counting the number of transport packets constituting a transport stream, and a null for generating a null packet corresponding to the count value of the counting means. And a packet generating unit.

[0015] A second transport stream recording apparatus of the present invention comprises: a counting means for counting the number of transport packets constituting the transport stream; and a reproduction start position from the transport packets constituting the transport stream. Detecting means for detecting a transport packet in which data that can be described as, and creating means for creating an entry point map for specifying a transport packet in which data that can be a reproduction start position are described. Can be included.

The detecting means detects a transport packet in which data of an I picture is described as a transport packet in which data which can be a reproduction start position is described. The count value of the counting means corresponding to the transport packet in which picture data is described, and the PTS of the I picture can be described in the entry point map.

According to a second transport stream recording method of the present invention, a header is added to a transport packet forming a transport stream to generate a source packet, and the header is added to the header. The method includes a step of classifying source packets by a predetermined number to generate an aligned unit, and a recording step of recording the aligned unit on a data recording medium, and the data amount of the aligned unit is It is characterized by being equal to an integral multiple of the amount of data recordable in one sector.

The program of the second program recording medium of the present invention is generated by a header adding step of adding a header to a transport packet forming a transport stream to generate a source packet, and a header adding step. The method includes a step of classifying source packets by a predetermined number to generate an aligned unit, and a recording step of recording the aligned unit on a data recording medium, and the data amount of the aligned unit is It is characterized by being equal to an integral multiple of the amount of data recordable in one sector.

In the transport stream reproducing apparatus of the present invention, a designating means for designating a reproduction start position, a computing means for computing an address on a data recording medium corresponding to the designated reproduction start position, and a computing means for computing Reading means for starting reading of a transport packet from an address on a data recording medium.

[0020] The transport stream reproducing apparatus of the present invention compares an acquisition means for acquiring an entry point map from a data recording medium with a designated reproduction start position and a PTS described in the entry point map. Search means for searching for an entry point adjacent to the playback start position, wherein the calculation means uses a count value described in an entry point map to generate a transport packet corresponding to the entry point. Can be calculated on the data recording medium on which is recorded.

In the transport stream reproducing apparatus of the present invention, the conversion means for converting the designated erasure range into a data area in units of aligned units, and the data is recorded in the data area in units of aligned units converted by the conversion means. Erasing means for erasing the transport stream.

According to the transport stream reproducing method of the present invention, there are provided a specifying step of specifying a reproduction start position, a calculation step of calculating an address on the data recording medium corresponding to the specified reproduction start position, and a processing of the calculation step. A step of starting to read the transport packet from the calculated address on the data recording medium.

The program of the third program recording medium of the present invention comprises a designation step of designating a reproduction start position, a computation step of computing an address on the data recording medium corresponding to the designated reproduction start position, and a computation step Reading a transport packet from the address on the data recording medium calculated in the above processing.

In the first transport stream recording apparatus and method, and the program recording medium according to the present invention, a source packet is generated by adding a header to a transport packet constituting a transport stream, and the source packet is stored in a predetermined format. Aligned units are generated by being collected for each number, and the aligned units are recorded on a data recording medium.

In the second transport stream recording apparatus and method, and the program of the program recording medium of the present invention, a source packet is generated by adding a header to a transport packet constituting a transport stream, and the generated source packet is generated. Aligned units are generated by dividing the source packets by a predetermined number,
The aligned unit is recorded on the data recording medium.

In the transport stream reproducing apparatus and method of the present invention, and in the program of the third program recording medium, a reproduction start position is specified, and an address on the data recording medium corresponding to the specified reproduction start position is calculated. Then, reading of the transport packet is started from the calculated address on the data recording medium.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first configuration example of a recording apparatus as an embodiment of a transport stream recording apparatus according to the present invention will be described with reference to FIG. This recording device 1
0 indicates a transport packet of one program transport stream input from the set-top box that receives the digital broadcast signal to the recording device 10 at irregular intervals as shown in FIG. 2
As shown in FIG. 2B, a transport packet extra header is added to make a source packet, and as shown in FIG.
The transport stream is recorded on the data recording medium 21 formatted in sector units. Note that the horizontal axis of FIGS. 2A and 2B indicates the time axis of the arrival time of the transport packet at the recording device 10.

The stream analyzer 11 of the recording device 10
PAT (Program Association Table), PMT
(Program Map Table) and PCR (Program Clock Refer
ence) is read out sequentially and the PCR is PL
Output to L (Phase Locked Loop) unit 12. The stream analyzer 11 also counts the number of transport packets that are sequentially input, and outputs the count value to the null packet generator 14 as a packet number.

The stream analysis unit 11 further detects a position (entry point) on the time axis at which random access reproduction of the input transport stream can be started, and information (entry point data) for specifying the entry point. Is output to the stream database creation unit 16. Specifically, a transport packet in which the head of the data of the I picture specified by MPEG2 is described as the entry point data, and the packet number of the transport packet and the PTS (Presentation) of the I picture are detected. Time Stamp) is supplied to the stream database creation unit 16. PTS, MPE
This is information included in the header of the PES packet of the G2 Systems standard, and indicates the playback time (elapsed time from the reference time) of the I picture with reference to the playback start time of the program.

The PLL unit 12 uses the PCR input from the stream analysis unit 11 to match the 27 MHz system clock signal and outputs the signal to the counter 13. The counter 13 synchronizes with the system clock signal input from the PLL unit 12 to record the transport packet recording device 1.
Arrival time clock (arriv
al_time_clock), and at the same time, outputs an arrival time stamp (arrival_time_stamp), which is a sample value of the arrival time clock, to the transport packet extra header (TP_extra_header) adding unit 15. Here, it is assumed that the arrival time clock is initialized to 0 when the first transport packet of the program is input.

For example, if the counter 13 is a binary counter for counting clock pulses of 27 MHz, and if the bit length of the arrival time stamp is N, N bits of the LSB (Least Significant Bit) of the count value are used as the arrival time stamp. Output as

That is, assuming that the value of the binary counter for counting the 27 MHz clock pulse at time t is arrival_time_clock (t) and the bit length of the arrival time stamp is N, the arrival time stamp ATS (t) at time t is It is calculated by the following equation (1). ATS (t) = arrival_time_clock (t)% 2 ^N (1) where the symbol “%” in Expression (1) is an operator for calculating the remainder of a positive integer.

FIG. 3 shows the syntax of a source packet. TP_extra_header () indicates a transport packet extra header having a length of 4 bytes. tansport_p
acket () indicates an MPEG2 transport packet having a length of 188 bytes specified by ISO / IEC13818-1.

FIG. 4 shows that the arrival time stamp is 30
This figure shows the syntax of the transport packet extra header when the bit length is set.

The copy permission indicator is a copy restriction (copy free,
no more copy, copy once, or copy prohibited). arrival_time_stamp
Is an integer having the value specified by ATS (t), where N = 30 in equation (1).

The null packet generation unit 14 corresponds to the last packet number input from the stream analysis unit 11 and generates null packets (188) having no meaning as information.
Byte) and outputs it to the transport packet extra header adding unit 15. That is, the recording device 10
If the total number of transport packets (corresponding to the last input packet number) constituting a series of programs input to the CPU is not a multiple of 32, the last input packet number and a value larger than that value Null packets are generated by the number of differences from the nearest multiple of 32 and output to the transport packet extra header adding unit 15.

Therefore, the transport packet extra header adding unit 15 receives a packet of an integral multiple of 32, including the transport packet from the outside and the null packet from the null packet generating unit 14. Become. Here, the null packet means that the value of the packet ID (PID) of the transport packet is 0 in hexadecimal.
It is x1FFF and the packet has no meaningful data in the payload.

The transport packet extra header adding unit 15 includes a transport packet (188 bytes) input from the outside or a null packet generating unit 1
The transport packet extra header (4 bytes) including the arrival time stamp input from the counter 13 is added to the null packet input from the counter 4 at the same time as the input of the packet, and 192 as shown in FIG.
A byte source packet is generated and output to the file system unit 17.

The stream database creation unit 16 uses the entry point data (the PTS of the I picture and the packet number of the transport packet storing the data of the I picture) input from the stream analysis unit 11 to enter the entry point data. A map is generated and output to the file system unit 17.

As shown in FIG. 5B, the file system section 17 divides the source packets (192 bytes) input from the transport packet extra header adding section 15 into 32 packets and divides the 32 source packets into 32 source packets. Aligned unit (Aligned u) which is a logical data unit
nit) (6144 bytes) and file
As shown in (A), a DVR transport stream in which aligned units are continuously arranged is sent to an error correction unit 18.
Output to The file system unit 17 also generates an entry point map file by converting the entry point map input from the stream database creation unit 16 into a file, and outputs the entry point map file to the error correction unit 18.

The error correction section 18 is a file system section 1
Then, information for error correction is added to the file input from 7 and output to the modulator 19. The modulating unit 19 includes the error correcting unit 1
8 is modulated by a predetermined method and the writing unit 2
Output to 0. The writing unit 20 allocates one aligned unit (6144 bytes) to the 3
It is recorded in a sector (6144 bytes = (2048 * 3)). That is, as shown in FIG. 6, the M-th aligned unit is recorded in the (3 * M) to ((3 * M) +2) sectors of the data recording medium 21, and the (M + 1) -th consecutive unit is recorded. The aligned unit is (3 * (M +
1)) to (3 * (M + 1) +2) th sector. The writing unit 20 also records the entry point map at a predetermined position on the data recording medium 21.

The data recording medium 21 is a recording medium, such as a hard disk, an optical disk, a magneto-optical disk, or a semiconductor memory, which is randomly accessible and has a data recording area formatted in sector units.

The control unit 22 controls the drive 23 to
Magnetic disk 24, optical disk 25, magneto-optical disk 2
6 or a control program stored in a program recording medium such as the semiconductor memory 27, and controls each unit of the recording apparatus 10 based on the read control program and commands input by a user.

Next, the transport stream recording processing of the recording device 10 will be described with reference to the flowchart of FIG. This transport stream recording process is started in response to a recording start command from a user.

In step S1, the stream analyzer 11 initializes the packet number TPN to 0. In step S2, the stream analysis unit 11 determines whether a transport packet has been input from the outside, and waits until it determines that a transport packet has been input from the outside. If it is determined that a transport packet has been input from the outside, the process proceeds to step S3.

In step S3, the transport packet extra header adding section 15 adds the transport packet extra header (4 bytes) including the arrival time stamp input from the counter 13 to the transport packet (188 bytes) input from the outside. ) Is added to generate a 192-byte source packet and output it to the file system unit 17.

Here, the process of generating the arrival time stamp included in the transport packet extra header will be described with reference to the flowchart of FIG.

In the stream analysis unit 11, step S1
In 1, the PA of the input transport stream
A PAT packet having a PID of 0x0000 in which T is stored is detected, and a PID of a packet in which a PMT described in the PAT is stored (hereinafter, referred to as a PMT packet) is obtained.
In step S12, the information acquired in step S11
The PMT is detected based on the PID of the PMT packet, and the PID of a packet (hereinafter, referred to as a PCR packet) storing the PCR described in the PMT is obtained. Step S13
In the P of the PCR packet obtained in step S12,
A PCR is extracted based on the ID. The extracted PCR is
It is supplied to the L section 12.

In the PLL unit 12, the system clock signal is matched using the PCR input from the stream analysis unit 11 in step S 14, and the system clock signal is supplied to the counter 13. In the counter 13, in step S15,
The arrival time counter is counted up in synchronization with the system clock signal from the PLL unit 12, and at the same time, the sampling value is output to the transport packet extra header adding unit 15 as an arrival time stamp.

Returning to FIG. In step S4, the stream analysis unit 11 increments the packet number TPN by 1 and outputs the packet number TPN to the null packet generation unit 14.

In step S5, the stream analyzer 11 determines whether or not the input of the transport packet from the outside has been completed. If it is determined that the input of the transport packet from the outside has not been completed, the process returns to step S2, and the subsequent processing is repeated.

While the processing of steps S2 to S5 is repeated, the source packets output to the file system unit 17 are divided into 32 units to be aligned units, and the aligned units are shifted to the front. The DVR transport stream file added with error correction information by the error correction unit 18 and modulated by the modulation unit 19 is recorded on the data recording medium 21 by the writing unit 20.

When it is determined in step S5 that the input of the transport packet from the outside has been completed,
Proceed to step S6.

In step S6, the null packet generator 14 determines whether or not the packet number TPN last inputted from the stream analyzer 11 is a multiple of 32.
If it is determined that the last input packet number TPN is not a multiple of 32, the process proceeds to step S7. At this time, there are less than 32 source packets that are not filed as aligned units.

In step S7, the null packet generator 14 generates null packets by the number of differences between the last input packet number TPN and the multiple of 32, which is larger than the value and is the closest. , To the transport packet extra header adding unit 15. Step S
In step 8, the transport packet extra header adding unit 15 adds a transport packet extra header to the null packet input from the null packet generating unit 14 to generate a source packet, and outputs the source packet to the file system unit 17.

The file system unit 17 adds 32 source packets, which are the source packets of the null packets and the source packets that could not be aligned in the previous unit because the number is less than 32, as an aligned unit in the subsequent stage. Output. Hereinafter, similarly, the error correction unit 18
After the information for error correction is added to the data and modulated by the modulation unit 19, the information is recorded on the data recording medium 21 by the writing unit 20.

As described above, according to the recording apparatus 10, even if the total number of transport packets constituting one input program is not a multiple of 32, only the number insufficient for a multiple of 32 is required. Since null packets are generated, all transport packets can be recorded on the data recording medium 21 as aligned units corresponding to a data amount of three sectors. Therefore, the data can be read from the data recording medium 21 that manages the data in sector units.

Next, the entry point map recording processing executed in parallel with the above-described transport stream recording processing will be described with reference to the flowchart of FIG. This entry point map recording process is started at the same time as the transport stream recording process described above.

In step S21, the stream analyzer 11 determines whether a transport packet has been input from the outside, and waits until it determines that a transport packet has been input from the outside. If it is determined that a transport packet has been input from the outside, the process proceeds to step S22.

In step S22, the stream analysis unit 11 detects whether or not 1 is described in the payload unit start indicator (payload_unit_start_indicator) included in the transport packet header of the transport packet, thereby detecting the transport packet. Of the PES packet starts from the first byte of the PES packet. It is detected that 1 is described in the payload unit start indicator, and the payload of the transport packet is
If it is determined that the processing has started from the first byte of the PES packet, the process proceeds to step S23.

In step S23, the stream analysis unit 11 adds 0x000001 which is the MPEG video sequence header code (sequence_header_code) to the beginning of the PES packet described in the payload of the transport packet.
It is determined whether B3 is described. When it is determined that the sequence header code of the MPEG video is described, the payload of the transport packet includes
It is determined that picture data is described, and the process proceeds to step S24.

In step S24, the stream analysis unit 11 determines that the transport packet is an entry point, and determines the PTS of the I picture stored in the transport packet and the packet number of the transport packet. Identification information of the program
(video_PID) and output to the stream database creation unit 16 as entry point data.

In step S25, the stream database creation unit 16 describes the entry point data input from the stream analysis unit 11 in an entry point map.

For example, as shown in FIG. 10, when it is determined that I-picture data is described in the payload of a transport packet having a packet number of (32 * M + 4), as shown in FIG. In the entry point map, the packet number (32 * M + 4) and its PT
S (= pts1) is described in association with it. When it is determined that the I-picture data is described in the payload of the transport packet having the packet number of (32 * (M + 1) +5), the entry point map includes
Packet number (32 * (M + 1) +5) and its PTS (= pts
2) is described in association.

In the entry point map of FIG. 11, the packet number of the packet storing the data of the I picture is indicated as I_start_packet_No. In the entry point map, the offset source packet number (offset_source_packet_numbe
r) is a packet number assigned to the first packet of the program, and its initial value is 0.

In step S26, the stream analyzer 11 determines whether or not the input of the transport packet from the outside has been completed. If it is determined that the input of the transport packet from the outside has not been completed, the process returns to step S21, and the subsequent processing is repeated. In step S26, it is determined that the input of the transport packet from the outside has been completed. If so, step S2
Go to 7.

In step S 27, the stream database creating section 16 outputs the created entry point map to the file system section 17. The file system unit 17 converts the input entry point map into a file and outputs the file to the subsequent stage. Thereafter, information for error correction is added by the error correction unit 18, modulated by the modulation unit 19, and then recorded on the data recording medium 21 by the writing unit 20.

The entry point map recorded on the data recording medium 21 as described above is used in a reproduction process described later.

Since the entry point map describes the packet number as information for specifying the position of the entry point, the position of the entry point is expressed by using a byte-accurate address. The required bit amount can be reduced.

FIG. 12 shows a second configuration example of a recording apparatus which is an embodiment of the transport stream recording apparatus of the present invention. This recording device 30 is the same as the recording device 10 of the first configuration example shown in FIG. 1 except that the null packet generation unit 14 is deleted, and other configuration blocks are common to the recording device 10.

FIG. 13 shows a DVR transport stream generated by the recording device 30. The difference from the DVR transport stream (FIG. 5) generated by the recording device 10 is that, as shown in FIG. 13D, when the number of source packets at the end portion is less than 32, null packets are not added. Is recorded as it is. The number (Nx + 1) of source packets less than 32 at the end is calculated by the following equation (2). Npacket = file size / 192 Nx = Npacket% 32 (2)

Here, Npacket is the total number of source packets constituting the DVR transport stream. The file size is the data amount (byte amount) of the DVR transport stream file managed by the file system unit 17. The symbol “/” is an operator for dividing the quotient down to the decimal point, and the symbol “%” is an operator for the remainder.

In the stream database creation unit 16, the DV
If the total number Npackets of the source packets constituting the R transport stream is described in the stream database, the playback device 40 (described later) can calculate Nx.

Next, FIG. 14 shows an example of the configuration of a reproducing apparatus which is an embodiment of the transport stream reproducing apparatus of the present invention. The playback device 40 is a recording device 10
Alternatively, the recording device 30 reproduces an AV signal corresponding to the DVR transport stream file from the data recording medium 21 on which the DVR transport stream file and the entry point map file are recorded.

The playback device 40 also stores the recorded DV.
It also has a function to partially delete the R transport stream file.

The read section 41 responds to a read control signal input from the control section 49 to read the data recording medium 21.
From the DVR transport stream file or the entry point map file, and outputs the signal to the demodulation unit 42. The demodulation unit 42 includes the reading unit 4
The signal input from 1 is subjected to demodulation corresponding to the modulation unit 19 of the recording device 10 or 30, and output to the error correction unit 43. The error correction unit 43 executes signal error correction based on the information for error correction given by the error correction unit 18 of the recording devices 10 and 30, and converts the obtained DVR transport stream file or entry point map file. Output to the file system unit 44.

The file system unit 44 is provided with the error correction unit 4
The DVR transport stream file input from 3 is separated into source packets and output to the comparator 45.
The file system unit 44 also supplies the entry point map input from the error correction unit 43 to the control unit 49.

The clock oscillator 48 generates an arrival time clock of 27 MHz and outputs it to the counter 60. The counter 60 counts a 27 MHz clock using the arrival time stamp value of the first source packet of the DVR transport stream as an initial value, calculates a time based on the clock counter value, and outputs the calculated time to the comparator 45. .

The comparator 45 removes the transport packet extra header from the source packet at the timing when the arrival time stamp included in the transport packet extra header of the source packet is equal to the current time inputted from the counter 60. The transport packet is output to the demultiplexer 46.

For example, if the time generated by the counter 60 is represented by the value of a binary counter that counts 27 MHz clock pulses, and the arrival time stamp is represented by an N-bit time with a precision of 27 MHz, At the timing when the N bit on the LSB side of the time generated at 60 is equal to the arrival time stamp, a transport packet in which the transport packet extra header is removed from the source packet is output from the comparator 45 to the demultiplexer 46. .

The demultiplexer 46 extracts video and audio transport packets corresponding to the program specified by the user from the transport packets input from the comparator 45, and outputs them to the AV decoder 47. The AV decoder 47 decodes the video and audio transport packets from the demultiplexer 46 and outputs the resulting video and audio signals to the subsequent stage.

The control unit 49 controls the drive 51 to
Magnetic disk 52, optical disk 53, magneto-optical disk 5
4 or a control program stored in a program recording medium such as the semiconductor memory 55, and controls the components of the playback device 40 based on the read control program and commands input by the user.

When the DVR transport stream file recorded on the data recording medium 21 is partially erased, the writing unit 50 converts the entry point map supplied from the control unit 49 according to a predetermined method (described later). The data is updated and recorded on the data recording medium 21.

Next, the reproduction process of the reproduction device 40 will be described.
This will be described with reference to the flowchart of FIG. This reproduction process is started when a user specifies a program to be reproduced and a command to start reproduction.

In step S 31, the entry point map corresponding to the program to be reproduced from the data recording medium 21 is read by the reading section 41, processed by the demodulation section 42 to the file system section 44, and then supplied to the control section 49. Is done. In step S32, the reproduction start position of the program (indicated by using the elapsed time from the beginning of the program) is input to the control unit 49 by the user.

In step S33, the control unit 49
The reproduction start position input in step S32 and the entry point map obtained in step S31 are described.
The PTS is compared, and the packet number of the entry point having the PTS value closest to the input reproduction start position (I_start_pac
ket_No) to determine the read start address of the DVR transport stream.

More specifically, the numbers AUNEP and AUNEP of the align unit including the source packet of the entry point
The number of offset packets from the beginning of the alignment unit indicated by to the source packet of the entry point OFTE
The sector number SNAU in which the head of the alignment unit indicated by P and AUNEP is recorded is calculated as a read start address as in the following equation (3). AUNEP = (I_start_packet_No−offset_source_packet_number) / 32 OFTEP = (I_start_packet_No−offset_source_packet_number)% 32 SNAU = AUNEP * 3 (3) Here, the symbol “/” is a division operator for cutting off the decimal part of the quotient, The symbol "%" is a remainder operator.

For example, when the reproduction is started from the entry point where the PTS of the entry point map shown in FIG. 11 is pts1, the packet number (I_start_packet_No) is 32.
* M + 4, the read start address is given by Equation 3.
Is calculated using the following. AUNEP = M OFTEP = 4 SNAU = 3M

In step S34, the reading section 41
Is based on the control of the control unit 49,
Of the DVR transport stream is started from the read start address determined in step S33. The read DVR transport stream is appropriately processed by the demodulator 42 to the demultiplexer 46, and is input to the AV decoder 47 as video and audio streams.

In step S35, the AV decoder 4
7 decodes the video and audio transport packets from the demultiplexer 46 and outputs the obtained video and audio signals to, for example, a monitor (not shown).

In step S36, the control unit 49
It is determined whether or not the user has instructed to change the reproduction position such as random access reproduction, for example. If it is determined that the change of the reproduction position has been instructed, the process returns to step S33, the read start address is determined again, and the subsequent processing is repeated.

If it is determined in step S36 that the change of the reproduction position has not been instructed, the process proceeds to step S37.
Proceed to. In step S37, the control unit 49 determines whether the user has instructed to end the reproduction. If it is determined that the end of reproduction has not been instructed, step S3
4 and the subsequent processing is repeated. Thereafter, when it is determined that the end of the reproduction has been instructed, the reproduction processing ends.

As described above, in the reproduction processing, reproduction is started from the entry point described in the entry point map, and the data recording medium 2 on which the data of the entry point is recorded.
Since the address on 1 can be easily obtained by a simple operation, it is possible to easily and quickly execute the control of the reading position.

Next, the process of partially erasing the DVR transport stream file recorded on the data recording medium 21 by the reproducing device 40 will be described with reference to the flowchart of FIG. The partial erasure process is started when a program to be partially erased is designated and a command for starting partial erasure is input by the user.

In step S41, the entry point map corresponding to the designated program is read from the data recording medium 21 by the reading section 41, and is appropriately processed by the demodulation section 42 to the file system section 44. Supplied to In step S42, the user deletes the range of the program to be erased (indicated by the elapsed time from the beginning of the program) by the
9 is input.

In step S43, the control unit 49
The erasure range input in step S42 and step S4
By comparing the entry point maps obtained in step 1, the erase range is converted into aligned units, and the address of the erase range is calculated in the same manner as the calculation in step S33 in FIG.

For example, as shown in FIG. 17A, when the user sets the PTS in the (M + 1) th aligned unit from the beginning of the program to the source packet whose pts is 3 as the erasure range, the erasure is actually performed. The range is converted from the beginning of the program to the M-th aligned unit, and the address is calculated.

In step S44, the control unit 49
In step S43, the recording of the erasure range is erased from the data recording medium 21, as shown in FIG.

In step S45, the control unit 49
The entry point map is updated, output to the writing unit 50, and written to the data recording medium 21. Specifically, in the case of the example shown in FIG. 17, the offset source packet number is rewritten to (M + 1) * 32, and the data of the entry point existing in the erased range of the program is erased and written. The data is output to the unit 50 and written to the data recording medium 21.

As described above, even in the partial erasing process,
Since the DVR transport stream file is erased in units of aligned units, the part that is not erased remains recorded in units of aligned units.

In this embodiment, the configuration examples of the recording device 10, the recording device 30, and the reproducing device 40 are shown as being independent from each other, but the recording device 10 (or the recording device 30) and the reproducing device 40 may be combined to form a single device.

In the above description, assuming that the sector size is 2048 bytes, the recording units 10 and 30 to which the present invention is applied have an aligned unit in an area of an integral multiple of a sector (in this case, an area of three sectors). , Ie, 2048 bytes * 3)
The recording method is not limited to this.

For example, if the sector size is 65536 (= 6
A method of recording data on a data recording medium of 4 * 1024) bytes will be described. FIG. 18 shows an area of three sectors including 32 aligned units (65536 bytes * 3).
In the example shown in FIG.

In FIG. 18, □ indicates one aligned unit, and the numbers (0 to 31) in the □ indicate the aligned unit numbers recorded in the area of three sectors. 10th aligned unit and 2nd
The first aligned unit is recorded over two sectors. The numbers (0 to 9) below the square indicating the aligned unit are offset numbers in the sector of the aligned unit in which all the data are available.

As shown in FIG. 18, at the beginning of recording, it is assumed that the first aligned unit is aligned with a sector. The Kth sector (K is a positive integer) includes the first half 4096 of the 0th to ninth aligned units and the 10th aligned unit.
(= 6144-2048) bytes are recorded and the (K +
The 1) -th sector includes the latter 2048 bytes of the tenth aligned unit, the eleventh to twentieth aligned units, and the first half of the 21st aligned unit 2048 (= 6144-4096). ) Bytes are recorded, and the (K + 2) th sector has the second
4096 bytes in the latter half of the first aligned unit,
And the 22nd to 31st aligned units are recorded.

When the file system is FAT or UDF (ie, when the sector size is 2048 bytes), the data at the start of the file must be aligned with the start position of the sector. If it is 65536 bytes, the data at the start point of the file may start from the middle of the sector. In that case, the file system manages a sector start offset indicating the position of the start point of the file in the sector.

A method of erasing data at the head of a file when the sector size is 65536 bytes will be described.

In this case, a case where the data at the head of the file is deleted will be described. First, as shown in FIG. 19, it is assumed that at the beginning of recording, the first aligned unit is aligned with a sector.

FIG. 20 shows an example in which data recorded in the 0th sector is erased in units of aligned units. In this example, the sector start offset indicating the position within the sector at the start of the file is:
6144 * i (i is an integer of 9 or less) bytes.

FIG. 21 shows an example in which data recorded in the first sector is erased halfway in aligned units. In this case, the sector start offset indicating the position in the sector of the start point of the file is 20
Indicates the value of 48 + 6144 * i bytes.

FIG. 22 shows an example in which data recorded in the second sector is erased in units of aligned units. In this case, the sector start offset indicating the position of the start point of the file in the sector is 40
Indicates the value of 96 + 6144 * i bytes.

Also in this case, after erasing the head of the file, the packet number of the offset with respect to the packet number indicating the entry point described in the entry point map (offset_source_packet in FIG. 11)
_number), and deletes from the entry point map the data of the entry point for which there is no entry point to be referred to because the aligned unit has been deleted.

When reproducing the DVR transport stream recorded in this way, the read start address of the DVR transport stream is determined based on the packet number indicating the entry point described in the entry point map.

More specifically, the following (1) to (6)
, The read start address of the DVR transport stream is determined.

In the process (1), the sector number OFT_SCT_NUM of the offset from the sector including the data of the file start point to the sector including the designated entry point is calculated using the following equation (4). OFT_SCT_NUM gives the value of K, K + 1, or K + 2 shown in FIG. TMP_ALU_NO = TMP1 / 6144 TMP_OCN = TMP_ALU_NO * 6144/65536 OFT_SCT_NUM = TMP_OCN-XN ... (4)

However, TMP1 = (I_start_packet_No−offset_source_packet_num
ber) * 192 + TMP2, and when sector_start_offset% 6144 = 0, TMP2 = sector_start_offset XN = 0, and when sector_start_offset% 6144 = 2048, TMP2 = sector_start_offset + 65536 XN = 1, and sector_start_40% = 61_40_96%. In some cases, TMP2 = sector_start_offset + 65536 * 2 XN = 2.

In the process (2), for the aligned unit including the entry point, the REF_AL corresponding to the 0th to 31st aligned units shown in FIG.
U_NO is calculated using the following equation (5). REF_ALU_NO = TM
P_ALU_NO% 32 ・ ・ ・
(5)

In the process (3), it is determined whether or not REF_ALU_NO is 10 or 21, and if it is determined that REF_ALU_NO is 10 or 21, the aligned unit including the entry point is indicated by OFT_SCT_NUM. It is determined that it extends over the next sector and the next sector.

When it is determined that REF_ALU_NO is neither 10 nor 21, in the process (4), OFT_SCT_NU
The offset byte number OST_FST_ALU from the start position of the sector indicated by M to the aligned unit in which all of the first data is all set is calculated using the following equation (6). ST_FST_ALU gives a value of 2048 bytes or 4096 bytes shown in FIG. OST_FST_ALU = (TMP_OCN
% 3) * 2048 (6)

In the process (5), the number of aligned units OFT_ALU_NUM of the offset from the aligned unit in which all of the first data is complete to the aligned unit including the entry point is calculated using the following equation (7). Is calculated. OFT_ALU_NUM indicates one of offset numbers (0 to 9) of aligned units in which all data in the sector shown in FIG. OFT_ALU_NUM = REF_ALU_NO-XNUM (7) However, when TMP_OCN% 3 = 0, XNUM = 0, and when TMP_OCN% 3 = 1, XNUM = 11 and TMP_OCN% 3 = 2. In this case, XNUM = 22.

In the process (6), in the aligned unit indicated by OFT_ALU_NUM, or in the aligned unit in which REF_ALU_NO is 10 or 21 in the process (3), the entry point of the entry point from the head source packet is determined. The offset packet number OFTEP up to the source packet is calculated using the following equation (8).

OFTEP = (I_start_packet_No−offset_source_packet_number)% 32) (8)

Incidentally, the series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software can execute various functions by installing a computer built into dedicated hardware or installing various programs. It is installed from a program recording medium to a possible general-purpose personal computer or the like.

This program recording medium is, as shown in FIG. 1, for example, a magnetic disk 24 (including a floppy disk) on which the program is recorded, which is distributed to provide the user with the program separately from the computer.
Optical disk 25 (CD-ROM (Compact Disc-Read Only Memo
ry), a DVD (including a Digital Versatile Disc), a magneto-optical disk 26 (including an MD (Mini Disc)), or a package medium including a semiconductor memory 27, as well as being pre-installed in a computer. It is composed of a ROM hard disk or the like in which a program is recorded, which is provided to the user in a state.

In this specification, the steps of describing a program recorded on a program recording medium are not limited to processing performed in chronological order according to the described order, but are not necessarily performed in chronological order. It also includes processes that are executed individually or individually.

In this specification, the system is
It represents the entire device composed of a plurality of devices.

[0127]

As described above, according to the first transport stream recording apparatus and method and the program recording medium of the present invention, source packets each having a header added to a transport packet are collected for each predetermined number. Since the aligned unit is generated and recorded, the transport packet can be efficiently recorded on the recording medium.

Further, according to the second transport stream recording apparatus and method of the present invention, and the program of the program recording medium, the source unit in which the header is added to the transport packet is divided into a predetermined number and the aligned unit. Is generated and recorded.
Transport packets can be efficiently recorded on a recording medium.

Further, according to the transport stream reproducing apparatus and method of the present invention and the program of the third program recording medium, the address on the data recording medium corresponding to the designated reproduction start position is calculated and calculated. Since the reading of the transport packet is started from the address on the data recording medium, the transport packet can be read efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a recording apparatus 10 to which the present invention has been applied.

FIG. 2 is a diagram illustrating transport packets sequentially processed by a recording device.

FIG. 3 is a diagram illustrating the syntax of a source packet.

FIG. 4 is a diagram illustrating the syntax of a transport extra header.

FIG. 5 is a diagram showing a data structure of an aligned unit.

FIG. 6 is a diagram for explaining the relationship between aligned units and sectors.

FIG. 7 is a flowchart illustrating a transport stream recording process of the recording device.

FIG. 8 is a flowchart illustrating a process of generating an arrival time stamp.

FIG. 9 is a flowchart for explaining an entry point map recording process of the recording device 10.

FIG. 10 is a diagram for explaining a relationship between a packet number described in an entry point map and a PTS.

FIG. 11 is a diagram showing an example of an entry point map.

FIG. 12 is a block diagram illustrating a configuration example of a recording apparatus 30 to which the present invention has been applied.

FIG. 13 is a diagram showing a data structure of an aligned unit.

FIG. 14 is a block diagram illustrating a configuration example of a playback device 40 to which the present invention has been applied.

FIG. 15 is a flowchart illustrating a reproduction process of the reproduction device 40.

FIG. 16 is a flowchart illustrating a partial erasure process of the playback device 40;

FIG. 17 is a diagram showing data erased in aligned units.

FIG. 18 is a diagram for explaining a method of recording an aligned unit on the data recording medium 21 having a sector size of 65536 bytes.

FIG. 19 is a diagram showing the relationship between aligned units and sectors at the beginning of recording.

FIG. 20 is a diagram showing an example in which an aligned unit recorded in a sector is deleted.

FIG. 21 is a diagram showing an example in which an aligned unit recorded in a sector is erased.

FIG. 22 is a diagram illustrating an example in which an aligned unit recorded in a sector is deleted.

[Explanation of symbols]

Reference Signs List 10 recording device, 11 stream analysis unit, 13
Counter, 15 transport packet extra header addition section, 16 stream database creation section, 17 file system section, 21 data recording medium, 22 control section, 23 drive, 24 magnetic disk, 25 optical disk, 26 magneto-optical disk, 27 semiconductor memory, 30 recording device, 40
Reproduction device, 44 file system unit, 45 comparator, 49 control unit, 50 writing unit, 52 magnetic disk, 53 optical disk, 54 magneto-optical disk, 55 semiconductor memory

Claims (19)

[Claims] 1. A transport stream recording apparatus for recording an input transport stream on a data recording medium, comprising: header adding means for generating a source packet by adding a header to a transport packet constituting the transport stream. A transport stream recording apparatus comprising: a generating unit that collects the source packets for each predetermined number to generate an aligned unit; and a recording unit that records the aligned unit on the data recording medium. . 2. The apparatus further comprises: counting means for counting the number of transport packets forming the transport stream; and null packet generating means for generating a null packet in accordance with the count value of the counting means. The transport stream recording device according to claim 1, wherein 3. The data amount of the aligned unit is:
2. The transport stream recording apparatus according to claim 1, wherein the transport stream recording apparatus is equal to an integral multiple of an amount of data recordable in one sector of the data recording medium. 4. The transport stream recording apparatus according to claim 1, wherein the head of the aligned unit is periodically arranged at the head of the sector. 5. A transport stream recording method for a transport stream recording apparatus for recording an input transport stream on a data recording medium, wherein a header is added to the transport packets constituting the transport stream to form a source packet. Generating a header adding step, collecting the source packets for each predetermined number to generate an aligned unit, and recording the aligned unit on the data recording medium. Transport stream recording method to use. 6. A transport stream recording program for recording an input transport stream on a data recording medium, wherein a source packet is generated by adding a header to the transport packets constituting the transport stream. A computer comprising: a header adding step; a generating step of collecting the source packets for each predetermined number to generate an aligned unit; and a recording step of recording the aligned unit on the data recording medium. A program recording medium on which a readable program is recorded. 7. A data recording medium on which a transport stream is recorded by a transport stream recording apparatus, wherein a source packet in which a header is added to a transport packet constituting the transport stream is provided every predetermined number. A data recording medium on which aligned units generated and collected are recorded. 8. A transport stream recording apparatus for recording an input transport stream on a data recording medium for recording data in sector units, wherein a header is added to a transport packet constituting the transport stream. A header adding unit that generates a packet; a partitioning unit that divides the source packet by a predetermined number to generate an aligned unit; and a recording unit that records the aligned unit on the data recording medium, The transport stream recording apparatus according to claim 1, wherein a data amount of the aligned unit is equal to an integral multiple of a data amount that can be recorded in one sector of the data recording medium. 9. The apparatus further comprises: a counting unit for counting the number of transport packets constituting the transport stream; and a null packet generating unit for generating a null packet in accordance with the count value of the counting unit. 9. The transport stream recording device according to claim 8, wherein: 10. A counting means for counting the number of transport packets constituting the transport stream, and data which can be a reproduction start position among transport packets constituting the transport stream are described. The apparatus further comprises: a detecting unit for detecting a transport packet; and a generating unit for generating an entry point map for specifying the transport packet in which data that can be the reproduction start position is described. Item 9. The transport stream recording device according to item 8. 11. The detecting means detects a transport packet in which data of an I picture is described as a transport packet in which data that can be a reproduction start position is described. The transport stream according to claim 10, wherein a count value of the counting means corresponding to the transport packet in which picture data is described, and a PTS of the I picture are described in the entry point map. Recording device. 12. A transport stream recording method of a transport stream recording apparatus for recording an input transport stream on a data recording medium on which data is recorded in sector units. A header adding step of adding a header to generate a source packet; a dividing step of dividing the source packets generated in the processing of the header adding step into a predetermined number to generate an aligned unit; Recording the India unit on the data recording medium, wherein the data amount of the aligned unit is equal to an integral multiple of the data amount recordable in one sector of the data recording medium. Stream recording method. 13. A transport stream recording program for recording an input transport stream on a data recording medium for recording data in sector units, wherein a header is included in a transport packet constituting the transport stream. A header adding step of adding a source packet to generate a source packet; a dividing step of generating an aligned unit by dividing the source packet generated in the processing of the header adding step into a predetermined number; Recording on the data recording medium, wherein the data amount of the aligned unit is equal to an integral multiple of the data amount recordable in one sector of the data recording medium. Programs that have various programs recorded Recording medium. 14. A data recording medium on which a transport stream is recorded by a transport stream recording device, wherein a source packet in which a header is added to a transport packet constituting the transport stream is provided every predetermined number. A data recording medium, wherein an aligned unit generated by being divided is recorded, and a data amount of the aligned unit is equal to an integral multiple of a data amount recordable in one sector of the data recording medium. . 15. A transport stream reproducing apparatus for reproducing a transport stream recorded in units of aligned units from a data recording medium, comprising: means for specifying a reproduction start position; Transport means for calculating an address on the data recording medium, and reading means for starting reading of the transport packet from the address on the data recording medium calculated by the calculating means. Stream playback device. 16. An acquisition means for acquiring an entry point map from the data recording medium, and comparing the designated reproduction start position with a PTS described in the entry point map to determine the designated reproduction start position. And a search unit that searches for an entry point adjacent to the entry point, wherein the calculation unit uses a count value described in the entry point map to record a transport packet corresponding to the entry point. The transport stream reproducing apparatus according to claim 15, wherein an address on a data recording medium is calculated. 17. A conversion unit for converting a designated erasure range into a data area in units of aligned units, and converting the transport stream recorded in the data area in units of aligned units converted by the conversion unit. The transport stream reproducing apparatus according to claim 15, further comprising: an erasing means for erasing. 18. A transport stream reproducing method for a transport stream reproducing apparatus for reproducing a transport stream recorded in units of aligned units from a data recording medium, comprising: a specifying step of specifying a reproduction start position; A calculating step of calculating an address on the data recording medium corresponding to the reproduction start position; and a reading step of starting reading of the transport packet from the address on the data recording medium calculated in the processing of the calculating step. A transport stream playback method comprising: 19. A transport stream reproducing program for reproducing a transport stream recorded in units of aligned units from a data recording medium, comprising: a specifying step of specifying a reproduction start position; A calculating step of calculating an address on the data recording medium corresponding to a start position; and a reading step of starting reading of the transport packet from the address on the data recording medium calculated in the processing of the calculating step. A program recording medium on which a computer-readable program is recorded.