JP2001016546A - Video recording and playback device - Google Patents

Abstract

(57) Abstract: Provided is a moving picture recording / reproducing apparatus which realizes trick playing of moving picture data using a digital TV capable of reproducing only moving picture data for normal speed reproduction. When recording moving image data, a picture detector detects a head PSC of a head I picture of a GOP from input stream data, and stores position information thereof in a DVD-RAM. On the other hand, at the time of reproducing the moving image data, the PTSDTS generator 120 uses the position information stored by the picture detector 112 to thin out the picture data in advance and to decode the time management information for reproduction output and the time management information for reproduction output. This creates stream data for trick reproduction in which the time management information is replaced, and sends it out to a digital TV capable of reproducing only moving image data for normal speed reproduction, for example.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Moving image data transmitted as G2-TS data is DV
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture recording / playback apparatus for recording on a storage medium such as a D-RAM, and more particularly to a moving picture recording that realizes trick playback of moving picture data using a digital TV capable of playing only moving picture data for normal speed playback. It relates to a playback device.

[0002]

2. Description of the Related Art With the recent improvement in digital compression technology and increase in the capacity of storage media, moving image data has been provided by, for example, a DVD-ROM instead of a conventional video tape.

[0003] When moving image data is provided by the DVD-ROM, a table for holding entry information of an image group structure, which is usually called a GOP and configured to enable random access, is prepared in advance. By sending the thinned picture data to the decoder while referring to this table, trick play such as fast forward and fast reverse can be realized. More specifically, DVD
In the ROM, navi-pack information, that is, entry information is added to one or two GOPs. Since the reproduction time of a GOP is about 0.5 seconds, for example, if I pictures included in every other GOP are displayed at a frame interval of 0.5 seconds, a reproduction speed of about twice is obtained. Will be. Thus, in the DVD-ROM,
Since the navi-pack information is prepared as a table, trick reproduction such as fast forward and fast rewind can be performed by determining the number of pictures to be thinned out from the navi-pack information.

Recently, for example, MPEG2
-DVD with moving image data transmitted as TS data-
2. Description of the Related Art A moving picture recording / playback apparatus that records data on a storage medium such as a RAM and reproduces moving picture data recorded on the storage medium has begun to be developed. Here, a case is considered in which moving image data recorded by the moving image recording / reproducing apparatus is trick-reproduced such as fast forward or fast reverse. in this case,
It is necessary to cut out the I picture contained in the moving picture data and transmit it to the decoder. However, since there is no entry information of this I picture, the entire moving picture data is searched to find the position of the I picture. Must. However, in such a method, when performing 30 × speed reproduction, the position of an I picture cannot be checked due to a transfer rate problem from a DVD-RAM drive or the like, so that trick reproduction is practically impossible.
When moving image data stored in the DVD-RAM is input to a digital TV or the like via a serial bus, the digital TV uses an MP for normal speed reproduction.
Since only EG2 data can be reproduced,
There was a problem that trick reproduction could not be performed.

[0005]

As described above, for example, a moving picture recording / reproducing apparatus which records moving picture data transmitted as MPEG2-TS data on a storage medium such as a DVD-RAM and reproduces the data using a digital TV or the like. Then
There is a problem that trick reproduction such as fast forward and fast reverse cannot be performed.

The present invention has been made in view of such circumstances. For example, a table for recording moving picture data transmitted as MPEG2-TS data on a storage medium and holding entry information of an I picture at the same time is provided. A digital TV capable of reproducing only moving image data for normal speed reproduction by transmitting stream data in which picture data is thinned out based on this table.
It is an object of the present invention to provide a moving picture recording / playback apparatus that realizes trick playback of moving picture data using a video.

[0007]

In order to achieve the above-mentioned object, a moving picture recording and reproducing apparatus according to the present invention records moving picture data, and simultaneously detects a picture start code from the recorded moving picture data. And obtains an absolute position in the moving image stream data, and creates a table for holding the absolute position as entry information. For this purpose, an input for inputting packet-multiplexed moving image stream data is performed. Means, selecting means for selecting only packets having a specific identification code from all packets inputted by the input means, and moving image stream data obtained from the packets selected by the selecting means on a recording medium. Recording means for recording the moving picture stream data obtained from the packet selected by the selecting means. Detecting means for detecting a start point of an image group structure configured to enable random access from among the above, and obtaining entry information indicating an absolute position from the beginning of the moving image stream data; and Entry table creating means for creating an entry table holding entry information of the acquired image group structure;
It is characterized by having.

In the moving picture recording / playback apparatus according to the present invention, the start position of a picture serving as an entry point at the time of random access is detected from the moving picture data and stored as a table, thereby outputting moving picture data for trick playback. And output of moving image data from an arbitrary position.

Further, a moving picture recording / playback apparatus according to the present invention comprises:
The recording means includes means for distributing and recording the moving image stream data on a plurality of types of recording media.

In the moving picture recording / reproducing apparatus of the present invention, for example, when the recording area of the DVD-RAM becomes small, recording is temporarily distributed to the HDD to prevent interruption of the recording on the way. First, record on HDD, and if necessary, DVD-RAM
It is possible to re-record the information.

Further, a moving picture recording / playback apparatus according to the present invention comprises:
The image processing apparatus further comprises a specifying unit that specifies an upper limit value of a file size defined in a file storing the moving image stream data, wherein the recording unit sets the moving image stream every time the recording unit reaches the upper limit value specified by the specifying unit. It is characterized by having means for switching a file for storing data.

In the moving picture recording / reproducing apparatus according to the present invention, the handling of stream data is simplified by deciding the upper limit value of the file, and the management in sorting and recording between storage media is simplified.

[0013] Further, a moving picture recording and reproducing apparatus according to the present invention comprises:
Extracting means for extracting entry information of an image group structure used for trick reproduction from the entry table; reading means for reading, from the recording medium, moving image stream data of an image group structure indicated by the entry information extracted by the extracting means; Time management information updating means for updating time management information for reproduction output and time management information for decoding included in the moving image stream data read by the reading means for trick reproduction; and updating the time management information. Packetizing means for packetizing the moving picture stream data whose time management information has been updated by the means, and output means for outputting the moving picture stream data packetized by the packetizing means to the outside. Features.

In the moving picture recording / playback apparatus of the present invention, picture data is thinned out, and time management information for playback output and time management information for decoding are updated to create stream data for trick playback. Thus, trick reproduction of moving image data using a digital TV capable of reproducing only moving image data for normal speed reproduction is realized.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a connection between a recording / reproducing apparatus according to an embodiment of the present invention and its peripheral devices.

The set-top box 70 transfers the received moving picture broadcast to the recording / reproducing apparatus 60 via the 1394 serial bus 95 as MPEG2-TS data.
The recording / reproducing device 60 stores the MPEG2-TS data transferred from the set-top box 70 in the HDD
Alternatively, it is recorded on a DVD-RAM. The recording / reproducing apparatus 60 transmits the recorded MPEG2-TS data to
94 is transferred to the digital TV 50 via the serial bus 90. Then, the digital TV 50 transmits the transferred MPE.
The G2-TS data is decoded, and the decoded image is displayed on the screen.

FIG. 2 shows an MPEG2-TS (ISO / IE)
It is a figure which shows the structure of Cl3818 Part1 (according to System standard).

Reference numeral 400 in the MPEG2-TS stream shown in FIG. 2A is called a transport packet.
Each transport packet has a packet header 41
0 and a payload 411. The packet header 410 includes a synchronization byte 420, an error indication 4
21, unit start indication 422, transport packet priority 423, PID 424, scramble control 425, adaptation field control 426,
Cyclic counter 427, adaptation field 42
8 and a payload 429. Then, one of the payloads 429 has a P shown in FIG.
The ES packet is stored in a divided form.

This PES packet has a PES header 44
0 and packet data 441. In the packet data 441, the video bit stream shown in FIG. 2C is stored in a divided form.

Then, this video bit stream is
SH (Sequence Header) 450, SH
E (Sequence Header Extension)
on) 451, GOP (Group of Pictu)
re) 452, PSC (Picture Start)
Code) 453, picture data 454 and SEC
(Sequence End Code) 455.

FIG. 3 is a diagram showing the structure of the recording / reproducing apparatus 60.

As described above, with respect to the recording / reproducing apparatus 60, moving image data is
PEG2-TS data is transferred via the serial bus 95. When recording is performed by the recording / reproducing apparatus 60, the MPEG2-TS data input to the 1394 connector 80 is transferred to the 1394 IO unit 1.
05, the data is transferred to the TS input buffer 110 via the stream dedicated bus 210. And this T
The stream data transferred to the S input buffer 110 is transferred to the PID selector 111 by the stream dedicated bus 220. Then, the PID selector 11
1 indicates that the PID 424 value is 0 for the CPU 100 first.
A program association table having the structure shown in FIG.

On the other hand, the CPU 100
When the program association table is received from 11, a PID to be recorded is selected from the table, and the selected PID value is notified to the PID selector 111. Then, the PID selector 111 selects only the transport packet having the PID value selected by the CPU 100 and transfers it to the picture detector 112 via the stream dedicated bus 230. When the picture detector 112 detects the head PSC of the head I picture of the GOP, the RAM 101, the HDD 114, and the DVD
-Store the position information in one of the storage devices of the RAM 115. The stream data input to the picture detector 112 is input to the stream reader / writer 113 via the stream dedicated bus 240.
Then, the stream reader / writer 113 converts the input stream data into the DVD-RAM 115 or HD
Record in D114.

The CPU 100 has a DVD-RAM 1
The stream information table having the structure shown in FIG.
PI selected from the program association table
Stream #m information (m
Is an integer starting from 1), and is written back to the stream information table. m represents the number of the added sequence position. For example, when m = 1, the stream file number is 1, and the PID 515 is the PID value selected earlier. If two programs are to be recorded at the same time, two items of stream #m information and stream # m + 1 information are added to the stream information table, and the same m is designated for the stream file number, and P
Recording is enabled by entering the respective PID values in the ID 515. That is, stream data having the same stream file number but two different PID values is generated.

The file name of the stream data to be recorded is expressed in a format such as StreamXX_YY. XX represents the stream file number 505. On the other hand, YY represents a serial number when the file is divided. For example, if the stream file number 505 is 1 and the stream data is divided into three files and the stream data is stored, the Stream01_0
1, Stream01_02, Stream01_03
Are generated. The upper limit of the size of each of these files is determined by the CPU 100 from the stream reader /
The writer 113 is instructed. When the stream data writing area of the DVD-RAM 115 runs short, the stream reader / writer 113
Sort into writing to. Further, a file (for example, Stream01_00) of which YY is 0 is also generated, and the file is detected by the picture detector 112, and the RAM 101, the HDD 114, and the DVD-RAM
The position information of the head PSC of the head I picture of the GOP stored in any one of the storage devices 115 is stored as a picture entry address table. This picture entry address table has the structure shown in FIG. Here, the absolute position of each picture from the head of the stream file is described in byte units,
The value of [a] indicates that it is the a-th entry address.

FIG. 7 is a diagram showing the internal structure of the picture detector 112.

In the picture detector 112, the stream splitter 301 is connected to the stream dedicated bus 230 and the stream dedicated bus 240. The stream splitter 301 and the payload detector 300 are connected by a stream dedicated bus 350. A TS stream byte counter register 302 is connected to the payload detector 300 via a line 352.

Further, the payload detector 300 and the FI
The FO buffer 304 is connected by a stream dedicated bus 351. The FIFO buffer 304 is connected to the line 35
4 is connected to the start code detector 305. Then, the TS packet start address register #
0 and the TS packet start address register # 1 are connected to the Payload Detector 3 by the line 353.
00 and to the start code detector 305 via line 354.

FIG. 8 is a flowchart showing the procedure of the picture start position detecting process in the recording / reproducing apparatus 60.

When stream data is input via the stream dedicated bus 230, the payload detector 300
Reads TS stream data (step A1). Here, the payload detector 300
When the head of the TS packet is detected (YES in step A2), the processing shifts to processing B (step A3) described later. On the other hand, if no signal is detected (N in step A2)
O), the value of the TS stream byte counter register is set to 1
Addition is performed (step A4). The processing of steps A2 to A4 is repeated until the head of all the TS packets has been detected from the data read in step A1 (YES in step A5). Further, the processing of steps A1 to A5 is performed until the detection work is performed on all stream data (step A5).
6 YES) is repeated.

FIG. 9 shows the processing B (step A in FIG. 8).
It is a flowchart which shows the procedure of 3).

First, the value of the TS stream byte counter register 302 is stored in a TS packet start address register #I (I can take a value of 0 or 1) 303 (step B1), and the TS packet Is stored in the FIFO buffer 304 via the bus 351 (step B2).

Next, the PSC of the first I picture of the GOP 452 is obtained from the data stored in the FIFO buffer 304.
(Picture start code) is detected (step B)
3). Here, when the PSC of the first I picture is detected (YES in step B4), the start code exists at the boundary between the payload data previously stored in the FIFO buffer 304 and the next payload data. At this time (YES in step B5), if I = 0, the value of the TS packet start address register # 1 is written out as a file, and if I = 1, the value of the TS packet start address register # 0 is written out as a file (step B5).
6. On the other hand, if the start code does not exist at the boundary (NO in step B5), the value of the TS packet start address register #I is written (step B8).

After updating the value of I (step B9), the TS stream byte counter register 3
188, which is the size of the TS packet, is added to 02 (step B10), and the process B ends.

As described above, the picture detector 112
A start position of a picture serving as an entry point at the time of random access is detected from moving image data.

FIG. 10 shows a PTSDTS generator 12.
It is a figure which shows the internal structure of 0.

In PTSDTS generator 120, first, selector 900 selectively outputs data input from stream dedicated bus 250 to either bus 950 or bus 955. The selector 920 selects data input from the bus 950 and the bus 970 and outputs the data to the stream dedicated bus 260. The selector 900 and the selector 920 are connected by a bus 950.

The selector 900 is connected to the TS payload I picture data detector via a bus 955, and the PES header PTS generator 910 is connected to the bus 96.
0 indicates the TS payload I picture data detector 90
5 is connected. Further, the TS packet generator 9
15 is connected to a PES header PTS generator 910 by a bus 965 and to a selector 920 by a bus 970.

FIG. 11 is a flow chart showing the procedure of the reproducing process in the recording / reproducing apparatus 60.

When the stream file number is set to 1 when performing the reproducing process, first, the Stream01_00 file existing on the DVD-RAM 115 is stored in the RAM1.
Read in 01. Then, it is determined whether or not normal reproduction is performed (step C1). If it is normal reproduction (YES in step C1), the value of the variable TPSkipNs is set to 0 (step C2), whereas if it is not normal reproduction (N in step C1).
O), calculate the value of TSKipNs according to the reproduction speed (step C3). For example, TPSkipNs = 1 at 2 × speed reproduction, and TPSkip at 4 × speed reproduction.
Set the value of Ns = 2.

Next, from PEAT [TP] to PEAT [T
The data at the file position represented by [P + 1] -1 is read (step C4). And TPSkipN
If s is not 0 (NO in step C5), PEAT
I picture data starting from [TP] is cut out (step C6), and the PTSDTS generator 120
In step C7, the values of PTS and DTS are changed according to the reproduction speed (step C7). Note that TPSki
If pNs is 0 (YES in step C5), the PTS
The DTS generator 120 does nothing (step C
8).

The TS packet data processed by the PTSDTS generator 120 is subsequently transferred to the 1394 IO unit 105. The 1394 IO unit outputs the transferred data from the 1394 connector 81 to the digital TV 50 via the serial bus 90.

Thereafter, the value of the variable TP is updated (step C10), and if there is a change to another reproduction mode, the flow proceeds to step C12, and if not, to step C4. And
If the playback mode to be shifted to is stopped (YES in step C12), the playback process ends. If not (NO in step C12), the process shifts to step C1.

As described above, the PTSDTS generator 1
Reference numeral 20 refers to the start position of each picture detected by the picture detector 112, and sends out stream data for trick reproduction in which picture data is thinned out in advance and the values of PTS and DTS are replaced.

As described above, in the recording / playback apparatus 60, the picture detector 112 detects the start position of the picture serving as an entry point at the time of random access from the moving image data transferred from the set-top box 70, , The PTSDTS generator 120 thins out the picture data based on the start position of the picture detected by the picture
By transmitting stream data for trick reproduction in which values of DTS and DTS are changed, trick reproduction using a digital TV 50 capable of reproducing only moving image data for normal speed reproduction is realized.

[0047]

As described above in detail, according to the present invention, the starting position of a picture serving as an entry point at the time of random access is detected from moving picture data and is stored as a table. Is thinned out, and time management information for playback output and time management information for decoding are transmitted as stream data updated for trick playback, so that only moving image data for normal speed playback can be played back A trick reproduction of moving image data using a digital TV is realized.

Further, for example, when the recording area on the DVD-RAM becomes small, the recording is temporarily allocated to the HDD to prevent the recording from being interrupted on the way, and the recording is temporarily made on the HDD. It is possible to re-record on the DVD-RAM as needed.

Further, by deciding the upper limit value of the file, the handling of stream data is simplified, and the management in distribution recording between storage media is simplified.

[Brief description of the drawings]

FIG. 1 is an exemplary view showing connection between a recording / reproducing apparatus according to an embodiment of the present invention and peripheral devices thereof.

FIG. 2 shows MPEG2-TS (ISO / IECl3818)
FIG. 2 is a diagram showing the structure of Part 1: conforming to the System standard).

FIG. 3 is an exemplary view showing the structure of the recording / playback apparatus according to the embodiment;

FIG. 4 is an exemplary view showing the structure of a program association table according to the embodiment;

FIG. 5 is an exemplary view showing the structure of a stream information table according to the embodiment;

FIG. 6 is an exemplary view showing the structure of a picture entry address table according to the embodiment;

FIG. 7 is an exemplary view showing the internal structure of the picture detector according to the embodiment;

FIG. 8 is an exemplary flowchart showing the procedure of a picture start position detecting process in the recording / reproducing apparatus of the embodiment.

FIG. 9 is an exemplary flowchart showing in detail a part of a procedure of a detection process in the recording / reproducing apparatus of the embodiment.

FIG. 10 is an exemplary view showing the internal structure of the PTSDTS generator of the embodiment.

FIG. 11 is an exemplary flowchart illustrating the procedure of a playback process in the recording / playback apparatus of the embodiment.

[Explanation of symbols]

50: Digital TV 60: Recording / playback device 70: Set-top box 105: 1394 IO unit 110: TS input buffer 111: PID selector 112: Picture detector 113: Stream reader / writer 120: PTSDTS generator 210, 220, 230, 240, 250 , 260 ... stream dedicated bus 300 ... payload detector 301 ... stream splitter 302 ... stream byte counter register 303 ... TS packet start address register 304 ... FIFO buffer 305 ... start code detector 900,920 ... selector 905 ... TS payload I picture data detector 910 ... PES header PTS generator 915 ... TS packet generator

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/93 H04N 5/91 Z 5/93 Z G11B 27/00 EA 27/10 A F term (reference) ) 5C053 FA23 FA25 GB04 GB06 GB08 GB21 GB38 GB40 HA24 HA25 JA22 JA24 KA05 KA08 KA24 LA15 5D044 AB07 BC01 BC06 CC04 CC09 DE03 DE12 DE22 DE49 EF05 FG23 GK12 HL02 5D077 AA22 AA30 AA38 BA30 CA02 DC03 A22 A23 CB02 DA17 DB08 DC06 DC16 DE04 DE06 EA08 EA09 EA17

Claims (4)

[Claims] An input unit for inputting moving picture stream data multiplexed by a packet; a selecting unit for selecting only a packet having a specific identification code from all packets input by the input unit; Recording means for recording, on a recording medium, moving image stream data obtained from a packet selected by the selecting means; and enabling random access from moving image stream data obtained from the packet selected by the selecting means. Detecting the starting point of the composed image group structure,
Detecting means for acquiring entry information indicating an absolute position from the head of the moving image stream data; and entry table creating means for creating an entry table holding entry information of the image group structure acquired by the detecting means. A moving picture recording / reproducing apparatus comprising: 2. The moving picture recording / reproducing apparatus according to claim 1, wherein said recording means has means for sorting and recording the moving picture stream data on a plurality of types of recording media. 3. The image processing apparatus according to claim 2, further comprising: a designation unit for designating an upper limit value of a file size defined in a file storing the moving image stream data, wherein the recording unit is configured to execute the process whenever the recording unit reaches the upper limit value designated by the designation unit. 3. The moving picture recording / reproducing apparatus according to claim 1, further comprising means for switching a file storing the moving picture stream data. 4. Extraction means for extracting entry information of an image group structure used for trick reproduction from the entry table, and moving image stream data of an image group structure indicated by the entry information extracted by the extraction means from the recording medium. Reading means for reading, time management information updating means for updating time management information for reproduction output and time management information for decoding of the moving image stream data read by the reading means for trick reproduction, Packetizing means for packetizing the moving image stream data whose time management information has been updated by the time management information updating means; and output means for externally outputting the moving image stream data packetized by the packetizing means. 4. The method according to claim 1, further comprising: Image recording and reproducing apparatus.