JP2003091936A - Stream data storage device, program and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stream data storage device where a program reproduction starting position can be specified by time. SOLUTION: In the stream data storage device 20, a specific reproduction information preparation part 40 prepares a specific reproduction information table by associating storage positions on a storage device 10 of an I picture with time stamps for reproduction control by every GOP of MPEG2 data. When an output request that specifies the time is received from the outside, a position characteristics part 70 specifies the storage position of the I picture corresponding to the specified time by using the specific reproduction information table, and an output part 60 outputs pieces of MPEG2 data of the specified I picture and thereafter to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stream data storage device that stores broadcast stream data in a recording medium and supplies the stream data to a playback device.

[0002]

2. Description of the Related Art In recent years, various stream data storage devices, such as hard disk video recorders, DVD video recorders and D-VHS, for recording stream data of digital broadcasting with high image quality and high sound quality have been put into practical use. This stream data storage device operates in cooperation with a set top box equipped with a tuner, a decoder, etc., and records the video / audio data received by the set top box onto a recording medium such as a hard disk, DVD-RAM, or video tape during recording. During reproduction, the audiovisual data recorded on the recording medium is read out and supplied to the set top box. In addition to the supply for normal playback, the function to supply video and audio data while periodically thinning out for special playback such as fast-forward playback, rewind playback and skip playback, and search for the program start position by program title etc. It also has a function of specifying the start position of the program for the purpose of finding the beginning and supplying the audiovisual data in order from the specified start position.

[0003]

By the way, the stream data storage device does not have an excellent function for viewing from the middle of the program. For example, when viewing a recorded soccer game relay from the latter half of the game, the user repeatedly instructs the stream data storage device to perform fast-forward, rewind and play using a remote controller, etc., and confirms the recorded contents in the latter half. There is a problem that it is necessary to perform a troublesome operation of searching for the game start position of.

In view of the above problems, it is an object of the present invention to provide a stream data storage device, program and method having a function of supporting viewing from the middle of a program.

[0005]

In order to solve the above problems, a stream data storage device of the present invention is a storage device which stores stream data in a recording medium and outputs the stream data to the outside. For each block, a generation means for generating a reproduction information table showing a correspondence relationship between a storage position of the block on the recording medium and a reproduction time of the block at the time of reproducing the stream data, and a time Receiving means for externally receiving a designated output instruction, specifying means for specifying a storage position of a block corresponding to the time designated by the output instruction based on the reproduction information table, and the specified block And an output unit that outputs subsequent stream data to the outside.

With this configuration, the stream data storage device specifies the output start position and outputs in response to the output request specifying the time. Therefore, this device accepts the output request specifying the time by the user's remote control operation or the like. With this configuration, the user can specify the reproduction start position depending on the time.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. <Structure> FIG. 1 is a functional block diagram of the stream data storage device 20. In the figure, the stream data storage device 20 includes a time stamp adding unit 30, a trick play information generating unit 40, a storage device interface 50, an output unit 60, and a position specifying unit 70, and a MPEG2 from a set top box (not shown). When data is input, the data is recorded in the storage device 10 which is a recording medium, and the MPEG2 data recorded in the storage device 10 is output to the set top box in response to an output request from the set top box.

Here, the set top box includes a tuner for receiving radio waves broadcast by digital broadcasting, a demodulation unit for demodulating an MPEG2 transport stream from the received radio waves, and a user operation or the like from the MPEG2 transport stream. A demultiplexer unit for extracting MPEG2 data corresponding to a designated channel (program), a decoding unit for decoding video / audio from the extracted MPEG2 data and outputting video / audio, and the like are provided. The set top box outputs the extracted MPEG2 data to the storage device 20 without decoding when recording the program in the storage device 10 of the stream data storage device 20, and outputs the stream when playing back the recorded program. The MPEG2 data output from the data storage device 20 is decoded. For MPEG2 transport streams, ISO / IEC
It is described in detail in the 13818 (MPEG2 system) standard.

The time stamp adding section 30 adds a time stamp to each access unit of the MPEG2 data input from the set top box and outputs the time stamp to the storage device interface 50. This time stamp is used for time management when the output unit 60 outputs MPEG2 data. An access unit refers to one frame for video and one audio frame for audio. If the set-top box transmits each access unit of MPEG data to the stream data storage device 20 at the same rate as the reproduction rate (or decoding rate), the time stamp adding unit 30 determines that each access unit is The time input from the set top box may be added as a time stamp. Alternatively, PTS (Presentation) is added to MPEG2 data input by the set top box.
Time Stamp) and / or DTS (Deco
When a time stamp such as "ding Time Stamp" is added in advance, the time stamp may be added to each access unit by using them. Further, the time stamp adding section 30 is configured to add a time stamp to each access unit, but may be configured to add a time stamp to each packet of MPEG data.

The special reproduction information generating section 40 generates a special reproduction information table. Special reproduction is a general term for reproduction in a form different from reproduction at a normal reproduction rate, such as fast-forward reproduction, rewind reproduction, and scene skip. For example, in the case of fast-forward playback, the set top box plays while skipping access units every several access units. In the case of rewinding reproduction, the reproduction is performed in the reverse order of the reproduction order while skipping the access units every several access units. In order to perform such special reproduction as a set top box, the stream data storage device 2
0 controls the output of the access unit. The information for this output control is the special reproduction information table. When the set top box performs special reproduction, the stream data storage device 20 controls the output of the access unit based on this special reproduction information table.

In addition, as a characteristic application of the present invention, the trick play information table indicates the output start position of the MPEG2 data recorded in the storage device 10 in response to an output request from the set top box accompanied by designation of time. Used when specifying. The output request accompanied by the designation of time means, for example, how many minutes after the start time of the program, how many minutes before the end time of the program, and how many minutes after the position of the image currently being reproduced, the start position of the reproduction start. It is an output request specified by time.

More specifically, the special reproduction information table is M
It is composed of the storage position of each I picture in the PEG2 data in the storage device 10 and the time stamp added by the time stamp unit 30 to the I picture. Here, the storage position is indicated by the address of the storage start position and the address of the storage end position of the I picture. I-pictures are also called intra-pictures or intra-frame coded images
This is a frame inserted every predetermined number of a plurality of frames forming the EG2 data, and is encoded only with the signal in the frame and without using the signals of other frames.

FIG. 2A shows a plurality of frames and I-picture frames arranged in the order of reproduction. For random access, a plurality of frames, for example, 15
I for every few frames (every GOP unit)
Pictures 201, 203 and 205 have been inserted.
When the MPEG2 data is input, the trick play information generation unit 40 specifies the start position of the I picture by detecting a specific data string indicating the I picture header. In addition, the data size information shown before and after the header information of each picture is used to count the data size of each picture.
Specify the end position of the picture. Further, the trick play information generation unit 40 acquires the addresses on the storage device 10 corresponding to the specified start position and end position of the I picture from the storage device interface 10 as the storage start position and the storage end position, respectively.

When the start position of the I picture is specified, the trick play information generating section 40 acquires the time stamp added to the I picture from the time stamp adding section 30. The trick play information generation unit 40 collects the storage start position, the storage end position, and the time stamp of the acquired I picture to generate one record.

The trick play information generating section 40 repeats the above series of operations each time an I picture is detected,
A trick play information table composed of each record corresponding to each I picture is generated. Although the trick play information generation unit 40 specifies the end position of the I picture from the start position of each I picture and the count of the data size, instead of this method, the header of the picture next to the I picture is specified. The end position of the I picture may be specified by detecting the data string shown. Since this eliminates the need for counting the data size, the configuration for counting becomes unnecessary and the circuit scale can be reduced.

FIG. 2B shows an example of the trick play information table. In the figure, the record 211 is shown in FIG.
Record corresponding to the I picture 201 of the record 21
3 is a record corresponding to the I picture 203, record 2
Reference numeral 15 is a record corresponding to the I picture 205. According to this, for example, the I picture 201 of FIG. 2A is stored from the start position Pb0 to the end position Pe0 of the storage device 10, and its time stamp is t0.

One special reproduction information table is generated corresponding to MPEG2 data having one unit.
The MPEG2 data having one unit refers to one program and a series of MPEG2 data from the start to the end of storage in the storage device 10. The storage device interface 50 records the time stamp added MPEG2 data transmitted from the time stamp addition unit 30 and the special reproduction information table transmitted from the special reproduction information generation unit 40 in the storage device 10. Further, the storage device interface 50 outputs the storage position of the I picture stored in the storage device 10 to the trick-play information generation unit 40 in response to a request from the trick-play information generation unit 40. Further, the storage device interface 50 outputs the MPEG2 data and the special reproduction information table to the output unit 60 in response to the request from the output unit 60.

The output unit 60 stores the MP recorded in the storage device 10 in response to an output request from the set top box.
The EG2 data is read by the storage device interface 50 and output to the set top box. Output unit 6
When there is an output request from the set top box, 0 identifies what type of output request the output request is, and outputs differently depending on the type. There are three types of output requests, namely, an output request for normal reproduction, an output request for special reproduction, and an output request accompanied by designation of time.

In the case of an output request for normal reproduction, the output unit 60 uses the MPEG2 stored in the storage device 10.
The data is added to each access unit in order from the head part and is output according to the time stamp. When the output request is for special reproduction, the output unit 60 identifies whether the type of special reproduction included in the output request is fast-forward reproduction, rewind reproduction, or scene skip.
Then, the output unit 60 uses the storage device interface 5
The special reproduction information table of the storage device 10 is read by 0, and the MPEG2 data is read by the storage device interface 50 according to the information indicated by the special reproduction information table and the type of special reproduction, and output to the set top box. . For example, in the case of fast-forward reproduction, the output unit 60 instructs the storage device interface 50 to read each I-picture, and outputs each read I-picture to the set top box at a predetermined fast-forward reproduction rate.
At this time, the storage device interface 50 refers to the storage position of each I picture shown in the trick play information table, reads the I picture at the storage position from the storage device 10, and passes it to the output unit 60.

The output request accompanied by the designation of time includes time designation information. FIG. 2C is a diagram showing the structure of the time designation information. In FIG. 7C, the time designation information is composed of a time designation type, time information, and a reference position type. The time designation type is (A) or (B) depending on how the time is designated.
And (C). The time designation type (A) designates the reproduction start position by designating the time such as how many minutes before or after what time based on the position of the MPEG2 data being currently reproduced, and the time designation type (B) is the accumulation. The reproduction start position is designated by designating a time such as minutes later or minutes before the position of the beginning or the end of the MPEG2 data recorded in the device 10, and the time designation type (C) is MPEG2 data. The playback start position is specified by directly specifying the time indicated by the added time stamp.

The time information is a value indicating a period or time in minutes. In the time designation type (A), the time information indicates a period, and this period corresponds to the reproduction time difference between the reproduction position and the reproduction start position at the time of output request. A positive / negative sign is attached to the period before and after the reproduction time of the reproduction position and the reproduction start position at the time of output request. That is, if the reproduction start position is past the reproduction position at the time of output request with reference to the reproduction position at the time of output request, a negative sign is attached, and if it is in the future, a positive sign is attached. .

In the case of the time designation type (B), the time information indicates a period, and this period corresponds to the time difference at the time of reproduction between the start or end position of MPEG2 data and the reproduction start position.
Positive and negative signs are attached to the period before and after the reproduction time at the start or end position and the reproduction start position. That is, if the reproduction start position is in the past with reference to the start or end position, a negative code is attached, and if it is in the future, a positive code is attached.

In the time designation type (C), the time information indicates the time, and this time is added to the MPEG2 data.
Alternatively, it corresponds to the time stamp described in the trick play information table. The reference position type is the time designation type (B)
In the time designation information, the head or end of the MPEG2 data is used as the time reference. MP here
The head and tail of the EG2 data indicate the head and tail positions of the MPEG2 data stored in the storage device 10. MPEG2 stored in the storage device 10
When the data corresponds to one program, the head and tail indicate the start position and end position of the program. The reference position type is included in the time designation information in the case of the time designation type (B), and is not included in the time designation types (A) and (B).

When the output unit 60 receives the output request accompanied by the time designation as described above from the set top box,
Instruct the position specifying unit 70 to specify the output start position,
The MPEG2 data after the specified output start position is read by the storage device interface 50 and output to the set top box. The position specifying unit 70 uses the output unit 6
In response to an instruction from 0, the storage position of the I picture corresponding to the reproduction start position is specified based on the time designation information and the special reproduction information table, and the storage position is output to the output unit 60. More details will be described with reference to FIG.

<Operation> FIG. 3A is a flowchart showing the processing procedure of the time stamp adding section 30 and the storage device interface 50. As shown in the figure, the time stamp adding unit 30 receives MPEG2 data from the set top box (step S30).
1) A time stamp is added to each access unit and output to the storage device interface 50 (step S303).

The storage device interface stores the access unit to which the time stamp has been added in the storage device 10. When the access unit is an I picture, the access is performed in response to a request from the trick play information generation section 40. -The storage position of the unit is output to the trick play information generation unit 40 (step S305). The time stamp adding unit 30 and the storage device interface 50 are
The processes of steps S301 to S307 are repeated for all access units of the MPEG2 data, and the process ends (step S307).

FIG. 3B is a flow chart showing the processing procedure of the trick play generator 40. As shown in the figure, the trick play generator 40 uses the MPE from the set top box.
When the G2 data is input (step S301), the data is analyzed (step S313). When an I picture is detected as a result of analysis or the like (step S31
5), the time stamp of the I picture is acquired from the time stamp adding unit 30, and the storage device interface 5
The storage position of the I picture is acquired from 0 (step S3).
17). Subsequently, the trick-play generating unit 40 creates the trick-play information table by adding the acquired information to the trick-play information table (step S319). The trick play generator 40 is used to access all MPEG2 data.
Steps S311 to S32 for the unit
The process of 1 is repeated to end the process (step S32).
1).

FIG. 4 is a flow chart showing the processing procedure of the output unit 60 and the position specifying unit 70. In the figure, when the output unit 60 receives an output request accompanied by a time designation from the set top box, the output unit 60 passes the time designation information included in the output request to the position identification unit 70 to identify the reproduction start position (step S401).

The position specifying unit 70 identifies whether the time designation type included in the time designation information is (A), (B) or (C) (step S403). When the identification result is the time designation type (A), the position identifying unit 70 outputs the MPE output from the output unit 60 to the set top box at that time.
Obtain the time stamp of G2 data (step S4)
05). Although the time point indicates when the time designation type is identified as (A), it may be when the output request is acquired.

When the identification result is the time designation type (B), the position specifying unit 70 further determines whether the reference position type included in the time designation information is the start position (start position in the figure) or the end position (in the figure, The end position) is identified, and the time stamp of the MPEG2 data at the start position or the end position is acquired according to the identification result (step S407). In this acquisition, when the reference position type is the start position, the time stamp of the first record of the trick play information table is acquired, and when the reference position type is the end position, the time stamp of the end record of the trick play information table is acquired. To do. In addition,
The MPEG2 data recorded in the storage device 10 may be scanned to obtain the time stamp added to the access unit at the head or tail position.

If the identification result is the time designation type (C), the process proceeds to step S411. After step S405 or step S407, the position specifying unit 70 calculates the time corresponding to the reproduction start position by adding the period indicated by the time information of the time designation information to the time indicated by the acquired time stamp (step S409). . For example, when the time of the time stamp is 3:15 and the period of the time information is +30, the time corresponding to the reproduction start position is 3:45. Also, the time stamp is 3:15,
When the period of time information is -15 minutes, the time corresponding to the reproduction start position is 3:00. It should be noted that the time stamp usually indicates a unit smaller than the minute unit, but in the present embodiment, the unit smaller than the minute unit is truncated and calculated. A unit smaller than the minute unit may be used as the time stamp and the time information.

The position specifying unit 70 acquires from the special reproduction information table a record having a time stamp that matches the time calculated in step S409 or the time indicated by the time information of the time designation type (C). If there is no time stamp that matches the time, the record with the time stamp closest to the time is acquired. And the position specifying unit 7
0 reads the start position and end position of the record and passes them to the output unit 60 (step S411). That is, the I picture stored from the start position to the end position becomes the reproduction start position.

The output unit 60 instructs the storage device interface 50 to sequentially read the MPEG2 data from the position specified in step S411, and access each access
Output to the set top box at a timing according to the time stamp added to the unit (step S41).
3). As described above, the stream data storage device 20
For the MPEG2 data stored in the storage device 10, when a special reproduction information table in which the storage position of an I picture and a time stamp are associated with each other is generated and an output request accompanied by time designation is received from the outside, the special reproduction information table is created. Based on this, the storage position corresponding to the time specified by the output request is specified, and the MPs stored after that storage position are specified.
EG2 data is output to the outside. With such a configuration, the stream data storage device 20 does not scan the storage device 10 but scans the trick play information table, so that the storage position corresponding to the designated time can be specified in a short time. effective. Further, since the trick play information table stores the storage position and the time stamp not for each access unit but for one access unit for each of a plurality of access units, the time required for scanning the trick play information table is thereby stored. Has the effect of becoming even shorter. Here, one access unit for every several access units is an I picture of an intra-frame coded image, so decoding and reproduction are performed from the I picture from the specified storage position without using other pictures. Therefore, there is an effect that a reproduction start position designated by time and a position actually reproduced are not displaced. Also, the stream data storage device 20
Is added to the storage device 10 by adding a time stamp to each unit of MPEG2 data input at the reproduction rate from the outside.
Since the trick play information table is generated in parallel with this, the time stamp and the storage position can be obtained without having to scan the storage device 10 after the storage is completed.

The present invention is not limited to the above embodiment and may be carried out as follows. (1) The trick play information table does not have to include a storage position and a time stamp for each I picture, and the stream data storage device 20 divides MPEG2 data into predetermined block units, and a block for each block. When a table in which the storage position on the storage device 10 and the reproduction time of the block when the MPEG2 data is reproduced is associated with each other and an output request accompanied by time specification is accepted, the specified time information of the output request and the table concerned are generated. The storage position of the block to be the reproduction start position may be specified from the above.

(2) In the time designation type (B), the reproduction start position is designated by designating a time such as minutes later or minutes before the beginning or the end of the MPEG2 data recorded in the storage device 10 as a reference. However, instead of using the start or end position as a reference, another position may be used as a reference. For example, the storage device 10 marks and stores a predetermined record in the trick play information table, and when the position identifying unit 70 receives an output request of the time designation type (B), the time of the record to which the mark is added is recorded. The time corresponding to the reproduction start position is calculated by adding the period indicated by the time information to the time indicated by the stamp, and the record corresponding to the calculated time is specified. The output unit 60 outputs the MPEG2 data to the set top box with the I picture of the specified record as the reproduction start position.

(3) Operating procedure of each component of the stream data storage device 20, specifically, FIGS. 3 (a) and 3 (b)
Also, a computer program for causing a general-purpose computer or a device having a program execution function to execute the operation procedure of the flowchart of FIG. 4 is recorded in a recording medium or distributed and distributed through various communication paths or the like. Good. Such recording media include IC cards, optical disks,
There are flexible disks and ROMs.

(4) The operating procedure may be a method. (5) You may implement it combining said embodiment and said (1)-(5).

[0038]

According to the stream data storage device of the present invention,
A storage device which stores stream data in a recording medium and outputs the stream data to the outside, wherein the stream data is divided into blocks, and the storage position of the block on the recording medium and the reproduction of the stream data are divided for each block. Generating means for generating a reproduction information table showing the correspondence with the reproduction time of the block at the time, acceptance means for externally receiving an output instruction designated by time, and the output based on the reproduction information table. It is provided with specifying means for specifying the storage position of the block corresponding to the time specified by the instruction, and output means for outputting the stream data after the specified block to the outside.

With this configuration, the stream data storage device specifies the output start position in response to the output request specifying the time and outputs it. Therefore, if the user can make this output request by remote control operation, etc., The user can specify the reproduction start position depending on the time. For example, when trying to watch a recorded soccer game relay from the beginning of the second half of the game, the latter half of the match start position is specified by the time such as the latter half of the match start time or the elapsed time from the first half of the match and played. be able to. This is effective when it is desired to specify a reproduction start position for reproduction of a program whose correspondence relationship between time and program content is known in advance, not limited to soccer. By using the stream data storage device of the present invention, the user does not have to find the reproduction start position while confirming the recorded contents by repeating the operations of fast-forward, rewind and reproduction many times as in the conventional case.

The time designated by the output instruction indicates a period, and the specifying means calculates the time obtained by adding the period to the reproduction time of a predetermined block at the time of reproducing the stream data, and calculates the time. The storage position of the block at the reproduction time corresponding to the specified time may be specified. With this configuration, the stream data storage device can perform the output by specifying the output start position in response to the output request specifying the period.

The accepting means may further accept information indicating the predetermined block, and the identifying means may be configured to identify using the received information. With this configuration, the stream data storage device receives information indicating a predetermined block that should be used as a specific reference for the storage position, and outputs an output that specifies the output start position according to the predetermined block indicated by the information and the specified period. It can be carried out. Thus, for example, the user specifies the information indicating the position currently being reproduced as information indicating a predetermined block by operating the remote controller or the like, and specifies the reproduction start position by specifying, for example, minutes before or minutes after the position. You can give instructions.

The time designated by the output instruction indicates the time, and indicates the reproduction time when the stream data is reproduced, and the specifying means specifies the storage position of the block of the reproduction time corresponding to the time. You may comprise.
With this configuration, the stream data storage device can perform the output specifying the output start position in response to the output request specifying the time.

Further, the generation means generates a reproduction information table showing a correspondence relationship between a storage position on the recording medium of an I picture included in each GOP and a reproduction time, in units of GOP of MPEG stream data, and The identification means is
The storage position of the I picture corresponding to the time designated by the output instruction is specified based on the reproduction information table,
The output means outputs the MP after the specified I picture.
The EG stream data may be output to the outside.

Further, each storage position is represented by an address of a head position and an address of an end position of the I picture on the recording medium, and the generating means detects the header of the I picture of the MPEG2 stream data. Thus, the address of the head position may be obtained, and the address of the tail position may be obtained by detecting the header of the picture next to the I picture.

With this configuration, the stream data storage device can easily find the end position of the I picture by detecting the header of the next picture.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a stream data storage device 20.

FIG. 2A shows a plurality of frames and I-picture frames arranged in a reproduction order. (B) shows an example of a trick play information table. (C) is a figure which shows the structure of time designation information.

3A is a flowchart showing a processing procedure of a time stamp adding unit 30 and a storage device interface 50. FIG. (B) is a flowchart showing a processing procedure of the trick play generation unit 40.

FIG. 4 is a flowchart showing a processing procedure of an output unit 60 and a position specifying unit 70.

[Explanation of symbols]

10 Storage device 20 Stream data storage device 30 Time stamp addition section 40 Special reproduction information generator 50 Storage device interface 60 Output section 70 Positioning unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/93 H04N 5/93 Z (72) Inventor Masataka Ozaka 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F-term (reference) 5C053 FA20 FA23 FA24 GB07 GB08 GB38 HA21 JA22 JA24 JA30 KA05 LA05 5D044 AB05 AB07 BC01 BC04 CC03 CC04 DE24 DE39 EF05 FG18 FG23 5D077 AA22 AA30 BA04 BA14 DC11 EA06 5D110 AA17 DD00 DE06 DE12

Claims (8)

[Claims] 1. Stream data is accumulated in a recording medium,
A storage device for outputting to the outside, wherein the stream data is divided into blocks, and for each block, the storage position of the block on the recording medium and the playback time of the block when the stream data is played back are stored. Generating means for generating a reproduction information table showing a correspondence relationship, receiving means for externally receiving an output instruction designated by time, and corresponding to the time designated by the output instruction based on the reproduction information table. A stream data storage device comprising: a specifying unit that specifies a storage position of a block; and an output unit that outputs the stream data after the specified block to the outside. 2. The time designated by the output instruction indicates a period, and the specifying unit calculates a time obtained by adding the period to the reproduction time of a predetermined block when reproducing the stream data, and the calculation is performed. The stream data storage device according to claim 1, wherein a storage position of a block at a reproduction time corresponding to the specified time is specified. 3. The stream data according to claim 2, wherein the accepting unit further accepts information indicating the predetermined block, and the identifying unit identifies using the received information. Storage device. 4. The time designated by the output instruction indicates a time, indicates a reproduction time when the stream data is reproduced, and the specifying unit specifies a storage position of a block of a reproduction time corresponding to the time. The stream data storage device according to claim 1, wherein 5. The generation means generates, for each GOP unit of MPEG stream data, a reproduction information table indicating a correspondence relationship between a storage position of an I picture included in each GOP on the recording medium and a reproduction time. The specifying unit specifies the storage position of the I picture corresponding to the time specified by the output instruction based on the reproduction information table, and the output unit determines the MP after the specified I picture.
5. The stream data storage device according to claim 1, wherein the EG stream data is output to the outside. 6. The storage locations are I on the recording medium.
It is represented by the address of the beginning position and the address of the end position of the picture, and the generation means is I of the MPEG2 stream data.
6. The stream data storage according to claim 5, wherein the address of the leading position is obtained by detecting the header of the picture, and the address of the ending position is obtained by detecting the header of the picture next to the I picture. apparatus. 7. Stream data is accumulated in a recording medium,
A program for causing a computer to execute a process of outputting to the outside, wherein the stream data is divided into blocks, and the storage position of the block on the recording medium and the stream data at the time of reproduction of the block are divided for each block. A generation step of generating a reproduction information table showing a correspondence relationship with the reproduction time of the block, a reception step of externally receiving an output instruction made by designating a time, and the output instruction based on the reproduction information table. A program comprising: a specifying step of specifying a storage position of a block corresponding to a specified time; and an output step of outputting stream data after the specified block to the outside. 8. Stream data is accumulated in a recording medium,
A method of outputting to the outside, wherein the stream data is divided into blocks, and for each block, the correspondence between the storage position of the block on the recording medium and the playback time of the block when the stream data is played back A generation step of generating a reproduction information table indicating the relationship, an acceptance step of receiving an output instruction from the outside by designating a time, and a block corresponding to the time specified by the output instruction based on the reproduction information table And a step of outputting the stream data after the specified block to the outside.