JP2001320673A - Computer system and video playback method - Google Patents

Abstract

(57) [Summary] [Problem] To display high-quality moving image data with sub-picture and audio with a simple configuration. An SD-ROM drive (21) stores MPEG moving image data with sub-video and audio. S
The MPEG stream from the D-ROM drive 21 is read by the CPU 11 via the system bus, and the video data, sub-picture, and audio data packets contained therein are separated from the MPEG stream by software processing by the CPU 11, and It is distributed to each decoder and decoded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system, and more particularly to a disk drive for driving a high-density recording medium in which moving image data and audio data including a main image and a sub-image are digitally compressed and recorded. The present invention relates to a multimedia-compatible computer system and a moving image reproducing method for displaying a moving image, reproducing sound, and the like by using a computer.

[0002]

2. Description of the Related Art In recent years, with the development of computer technology,
Various personal computers compatible with so-called multimedia have been developed. This type of personal computer can reproduce moving images and audio data in addition to text data and graphics data.

Normally, moving image data is compression-encoded by MPEG1 and stored in a CD-ROM or the like, and a dedicated expansion board is used for decoding and displaying and reproducing the moving image data. As an extension board for decoding and displaying and reproducing moving image data, for example, "REAL magic" of Sigma Design Inc. is well known. This “REAL magic” is MPEG1
Has a video decoding function conforming to the standard, and the decoded moving image data is combined with the VGA graphics taken in from the video card via the feature connector and displayed.

However, the standard of MPEG1 is 1.5 Mb.
The standard is based on the assumption that a CD-ROM having a data transfer rate of about ps is used. When moving image data including a large amount of image information such as a movie is handled, problems such as deterioration of image quality occur.

Therefore, recently, a new generation of storage media having a data transfer speed several to several tens of times that of a CD-ROM has begun to be developed. As such a new generation storage medium, a system capable of digitally recording an information amount of about 10 GB on one disk and realizing a data transfer rate of about 10 Mbps at the maximum has been proposed as a media player.

[0006] This media player records moving image data and audio data, which are digitally compressed and encoded in accordance with the MPEG2 standard, on a disk medium such as an optical disk, decodes the moving image data with audio, and sends the decoded data to a television receiver. Output.

The media player includes a disk drive, a data buffer, a video decoder, an audio decoder, and an NTSC encoder. In this media player, moving image data and audio data are read from the optical disk by driving the optical disk by a disk drive device,
Stored in the data buffer.

[0008] The moving picture data and audio data stored in the data buffer are decoded by a video decoder and an audio decoder, respectively. The moving picture data decoded by the video decoder is converted to an NTSC signal by an NTSC encoder and sent to a video input of a television receiver. On the other hand, the audio data decoded by the audio decoder is subjected to D / A conversion, and then sent to the audio input of the television receiver.

Since the data transfer rate of this media player is as high as about 10 Mbps as described above, if this media player is used, a movie including sub-pictures such as subtitles and a plurality of audio channels in addition to a main picture is used. Information can be recorded on a single disk having the same size as a CD, and the main video, sub-video and audio can be reproduced on a television receiver in synchronization with each other.

However, when this media player is mounted on a personal computer, it is necessary to provide a video decoder or the like inside the system of the personal computer separately from the media player.

[0011] This is because the video decoder inside the media player is dedicated to the player, and is a medium other than the media player, such as a hard disk or a CD.
This is because an MPEG title recorded in a ROM or the like cannot be decoded using a video decoder inside the player.

For this reason, it is desirable that the functions for decoding and reproducing the main video, the sub video and the audio, respectively, be provided inside the personal computer.

However, in order to decode and reproduce moving picture data with sub-picture and audio, a decoder for sub-picture and a sound decoder are required in addition to a video decoder for decoding moving picture data. There is a disadvantage that the cost is increased.

[0014]

As described above, a media player having a large capacity and a high transfer rate has recently been proposed. However, in order to provide a decoder function inside the media player in a personal computer as it is,
In addition to a video decoder for decoding video data, a decoder for sub-pictures must be prepared,
There is a disadvantage that the cost of the personal computer is increased.

The present invention has been made in view of the above points, and is capable of decoding and reproducing large-capacity multimedia information including main video, sub-video, audio data, and the like with a simple hardware configuration. It is an object to provide a simple computer system and a moving image reproducing method.

[0016]

SUMMARY OF THE INVENTION The present invention provides a disk drive capable of driving a recording medium in which moving picture data, sub-picture data, and audio data are multiplexed and recorded as a digital data string which has been digitally encoded. In a computer system configured to be connectable to a device and capable of reproducing a digital compression-encoded digital data sequence recorded on the recording medium, the digital compression-encoded digital data sequence includes the moving image data, When packet data of sub-picture data and audio data are multiplexed with an ID indicating the packet type added thereto, and the digital compression-encoded digital data string is read from the storage medium and reproduced. Runs operating system and application programs in memory CP of the computer system that
U, causing the CPU to execute a reproduction program for reproducing the digital compression-encoded digital data sequence, thereby causing the CPU to at least read the digital compression-encoded digital data sequence from the storage medium. Processing for separating moving picture packets, sub-picture packets, and audio packets from the read digital data sequence based on the ID, and providing the separated moving picture packets, sub-picture packets, and audio packets in the computer system, respectively. And a means for executing processing for distribution to the selected video decoding means, sub-picture decoder means, and audio decoding means.

As described above, by the software processing by the CPU, at least a process of reading a digital data string which has been digitally compressed and encoded from a storage medium, and a process of reading a moving picture packet, a sub-picture packet, and an audio packet And a video decoder, a sub-video decoder, and a video decoder, a sub-video decoder provided in the computer system, respectively.
And processing for distributing to the audio decoding means, it is possible to simplify the configuration of the computer as compared with the case where all of them are performed using dedicated hardware, and to perform moving image data and sub-picture on the computer. It is possible to reproduce a digital data string that has been subjected to digital compression encoding including data and audio data.

Further, the present invention is configured so as to be connectable to a disk drive device capable of driving a recording medium on which moving image data including sub-pictures is digitally compressed and encoded and recorded. In a computer system capable of reproducing moving image data including a sub-video recorded on a recording medium, an operating system is executed, and a reproduction program for reproducing the moving image data including the digital compression-encoded sub-video is reproduced. A CPU for executing a moving image recorded on the recording medium by executing the display, a display unit for synchronizing the reproduced moving image data and the sub-image, and synthesizing and displaying a main image including subtitles on graphics, Means for reproducing sound in synchronization with video.

The following configuration is also conceivable.

1) In a computer system which can be connected to a disk drive device capable of driving a recording medium on which moving image data with sub-pictures is recorded by being digitally compressed and encoded, a CPU is connected to a bus of the computer system. A video decoder for decoding moving image data, a display controller coupled to the bus, for synthesizing moving image data decoded by the video decoder on graphics drawn in a video memory, and displaying on a display monitor screen. Means for causing the CPU to decode sub-picture data included in the digital data string read from the disk drive device, and the C controller so that moving image data with sub-pictures is displayed on the screen by the display controller.
Means for causing a PU to render the decoded sub-picture in the video memory. 2) In a computer system that can be connected to a disk drive device capable of driving a recording medium in which moving image data with sub-pictures is recorded by being digitally compressed and encoded, a CPU, a card slot provided in a computer main body, A card controller connected to a bus of the computer system, the card controller controlling a card inserted in the card slot; a card mountable in the card slot, the card including a video decoder for decoding moving image data; A display controller that combines video data decoded by the video decoder of the card onto graphics drawn in a video memory and displays the video data on the screen of a display monitor; Served Means for decoding the sub-picture data included in the digital data sequence, and causing the CPU to render the decoded sub-picture in the video memory so that the moving image data with the sub-picture is displayed on the screen by the display controller. Computer system comprising:
3) In a data processing device capable of reproducing data on a recording medium in which moving image data with sub-pictures is recorded by digital compression encoding, a CPU, a video memory,
Means for causing the PU to decode at least the sub-video data included in the digital data sequence stored in the storage medium, so that the video data with the sub-video is displayed on the screen,
Means for causing the CPU to render the decoded sub-picture in the video memory. 4) A data processing device capable of reproducing data of a recording medium in which moving image data with sub-pictures is recorded by being digitally compressed and encoded, comprising a CPU and a video memory, wherein digital data recorded on the recording medium is provided. A data processing device, wherein at least a part of a data sequence is decoded by software processing by a CPU, and the decoded digital data sequence is rendered in the video memory. 5) A data processing device capable of reproducing data of a recording medium in which moving image data with sub-pictures is recorded by being digitally compressed and encoded, comprising a CPU and a system memory, wherein the CPU stores the moving image data in the recording medium. A data processing device that separates sub video data and moving image data included in the digital data series, and decodes at least the obtained sub video data on the system memory.

[0021]

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

FIG. 1 shows a system configuration of a personal computer according to an embodiment of the present invention. This system corresponds to a desktop personal computer. As shown in FIG.
0, CPU 11, system memory (MEM) 12, HD
D13, FDD14, Keyboard (KB) 15, SCS
I interface 16, audio controller 17,
MPEG2 decoder 18, multimedia display controller 19, and video memory (VRAM)
And an SD-ROM drive 21 that stores moving image data and the like encoded by MPEG2.
It is connected to the SCSI interface 16.

An SD-ROM (Super Densit)
y ROM) drive 21 corresponds to the disk drive unit of the media player described above.
It has a storage capacity of about 10 GB on both sides of the disk and a data transfer rate of about 10 Mbps at the maximum. This SD
-The ROM drive 21 is, as shown in FIG.
Optical disk 211, motor 212, pickup 2
13, an pickup drive 214, a servo controller 215, and an ECC for error detection and correction.
And a drive controller 216 including a circuit. The motor 212, the pickup 213, the pickup drive 214, the servo controller 215, and the drive controller 216 function as a drive device for driving the optical disk 211 and reading data recorded on the optical disk 211.

The optical disk 211 has, for example,
A movie of about 35 minutes can be recorded. The movie information can include main video (video), sub-video (sub-picture) up to 16 channels, and audio (audio) up to 8 channels.

In this case, these videos, sub-pictures,
And audio are digitally encoded according to the MPEG2 standard and recorded. In the MPEG2 standard, M
Other encoded data can be included in the data encoded by PEG2, and the encoded data is handled as one MPEG bit stream (digital data sequence).

Therefore, in this embodiment, MPEG2 is used for encoding video, and run-length encoding and D-length encoding are used for encoding subpictures and audio, respectively.
OLBY AC3 shall be used. Even in this case, the encoded video, sub-picture, and audio are treated as one MPEG bit stream.

The encoding process of the MPEG2 standard is variable speed encoding, and the data transfer rate can be changed.
Therefore, the amount of information to be recorded / reproduced per unit time for video data can be made different. Therefore,
Higher quality moving images can be played back by increasing the transfer rate of the MPEG bit stream that composes a frame group corresponding to a scene with more intense motion.

In order to use such features of MPEG2, in this embodiment, movie information is recorded on the disc 211 using a data format as shown in FIG.

As shown in FIG. 3, one piece of movie information is composed of a file management information section and a data section, and the data section has a large number of data blocks (block # 0).
~ # N). D at the beginning of each data block
There is an SI (Disk SerhInformation) pack, and one data block is from the DSI pack to the next DSI pack. The storage location of each DSI pack is managed by the disc search map information in the file management information section.

One data block is stored for a certain period of time.
For example, information for 15 frames necessary for reproducing a moving image of 0.5 seconds is formed, and a GOP (Group of information) is provided.
picture). Each data block includes a video pack (VIDEO pack), a sub-picture pack (SP pack), and an audio pack (A
UDIO packs) are multiplexed and recorded. These video packs (VIDEO packs), sub-picture packs (SP packs), and audio packs (AU
DIO pack) is a coded video, sub-picture, and audio data unit. The data size of these packs is fixed, but the number of packs that can be included in one data block is variable. Therefore, a data block corresponding to a scene with a sharp motion includes a larger number of video packs.

Each of the video pack, the sub-picture pack, and the audio pack includes a header section and a packet section (video packet, sub-picture packet, and audio packet). The packet part is the encoded data itself. The header section includes a pack header, a system header, and a packet header. In the packet header, a stream ID indicating whether the corresponding packet is a video packet, a sub-picture packet, or an audio packet is registered. .

Next, each unit of the system shown in FIG. 1 will be described.

The CPU 11 controls the operation of the entire system, and executes an operating system and an application program to be executed stored in a system memory (MEM) 12. SD-ROM
The reproduction of the movie recorded in the drive 21 is performed by causing the CPU 11 to execute the MPEG driver 121. The MPEG driver 121 includes a sub-picture decoding function.

The sub-picture decoding function of the MPEG driver 121 provides the following three functions.

(1) Decomposition of MPEG Bit Stream The MPEG bit stream decomposition function separates the MPEG bit stream into video packs, sub-picture packs, and audio packs, and transfers the video packs and audio packs to the MPEG2 decoder 18.
This separation process is executed for each pack based on the stream ID in FIG.

(2) Sub-picture decoding The sub-picture decoding function decodes the separated sub-picture pack on the system memory 12.

(3) Sub picture transfer to VGA The sub picture transfer function to the VGA is to transfer the decoded sub picture to the multimedia display controller 1.
9 is a function of drawing a sub-picture in a video memory (VRAM) 20.

The SCSI interface 16 is a peripheral interface for connecting a peripheral device such as an HDD or a CD-ROM to the system bus 10. In this embodiment, a data interface between the SD-ROM drive 21 and the system memory 12 is provided. Perform a transfer. SCSI interface 16
As shown, a SCSI controller (SCSI
CONT) 161 and a data buffer (BUFF)
162 are provided. SCSI controller 161
Is an SD-ROM drive 21 under the control of the CPU 11.
Controls data transfer to and from Data buffer (BU
FF) 162 is used to change the data transfer rate with the host system, and the SD-R
An MPEG bit stream including video, sub-picture, and audio read from the OM drive 21 is transferred to the CPU 11 via the data buffer (BUFF) 162.

In this case, the data transfer speed from the SD-ROM drive 21 to the data buffer 16 is SD-RO
The maximum data transfer rate of the M drive 21, for example, 9.5
Mbps.

On the other hand, from the data buffer 16 to the CPU 11
The data transfer speed is variable, and the more the data block with a large amount of information is transferred, the higher the average transfer speed at that time. This is because a data block with a larger amount of information increases the number of data transfers executed per fixed time.

The audio controller 17 includes a CPU 1
1 controls the input / output of sound data under the control of the PCM sound sources 171 and F for sound output.
An M sound source 172, a multiplexer 173, and a D / A converter 174 are provided. The output from the PCM sound source 171 and the FM sound source 172 and the digital audio data transferred from the MPEG2 decoder 18 are input to the multiplexer 173, and one of them is selected.

The digital audio data is SD-RO
The audio data read from the M drive 21 is decoded. The audio bus 18a is used for transferring digital audio data from the MPEG2 decoder 18 to the audio controller 17, and the system bus 10 is not used. Therefore, high-speed transfer of digital audio data becomes possible.

The MPEG2 decoder 18 has a CPU 11
Under this control, video and audio are each decoded, and they are synchronized and output. The sub-picture decoding function is not provided here.

The decoded audio data is transferred to the audio controller 18a via the audio bus 18a as digital audio data as described above. The decoded video data is digital Y
The data is sent to the multimedia display controller 19 as UV data. In this case, from the MPEG2 decoder 18 to the multimedia display controller 19
Transfer of digital YUV data to the video bus 18
b, and the system bus 10 is not used. Therefore, the transfer of digital YUV data can be performed at high speed as in the case of digital audio data.

As a video bus 18b, a VESA standard VEFC (VESA Advanced Feature) is used.
re Connector) or VM-Channel
el (VESA Media Channel) can be used.

The multimedia display controller 19 controls a CRT display used as a display monitor of the system under the control of the CPU 11, and supports not only VGA specification text and graphics display but also moving image display. .

As shown, the multimedia display controller 19 includes a graphics display control circuit (Graphics) 191, a video display control circuit 192,
Multiplexer 193 and D / A converter 194
Etc. are provided.

The graphics display control circuit 191 outputs V
GA compatible graphics controller, CPU
11, the VGA graphics data and the sub-picture drawn in the video memory (VRAM) 20 by R
The data is converted into GB video data and output. The video display control circuit 192 includes a video buffer for storing digital YUV data, and a video buffer for storing YUB data stored in the buffer.
It has a YUB-RGB conversion circuit for converting to GB video data.

The multiplexer 193 selects one of the output data of the graphics display control circuit 191 and the video display control circuit 192 or outputs the video output from the video display control circuit 192 to the VGA graphics from the graphics display control circuit 191. Are combined and sent to the D / A converter 194. The D / A converter 194 converts the video data from the multiplexer 194 into an analog RGB signal and outputs it to a CRT display.

FIG. 4 shows a specific configuration of the MPEG2 decoder 18.

The MPEG2 decoder 18 has a CPU
In order to synchronize and decode and play back the video and audio bit streams separated by 11,
Two decoders for video and audio,
That is, an MPEG2 video decoder 181 and an audio decoder 183 are provided.

These MPEG2 video decoders 18
1 and the audio decoder 183 are coupled to the system bus 10, respectively. The MPEG2 video decoder 181 has an R
AM 184 is provided.

The MPEG2 video decoder 181 uses the C
It decodes the video data transferred from the PU 11 and outputs it as digital YUV data. The audio decoder 183 decodes the audio data transferred from the CPU 11. The type of decoding performed here corresponds to the encoding performed on the audio data, that is, DOLBY AC3.
The decoded audio data is output as digital audio data.

Next, referring to the flowchart of FIG.
A procedure of a moving image reproduction process performed by the CPU 11 executing the MPEG driver 121 will be described.

The CPU 11 first reads the file management information from the SD-ROM drive 21 and
The data recording format on the M drive 21 is recognized (step S101). Next, the CPU 11
Is a data portion, that is, M from the SD-ROM drive 21.
The reading of the PEG bit stream is started (step S102). Whenever one pack is received, the stream ID recorded in the header part is recognized,
The MPEG bit stream is classified into a video pack, an audio pack, and a sub-picture pack based on the recognition result (steps S103 and S104).

If the received pack is a video pack, the CPU 11 converts it into an MPEG2 video decoder 18.
1 (step S105), and if it is an audio pack, it is transferred to the audio decoder 183 (step S106).

If the received pack is a sub-picture pack, the CPU 11 recognizes a position on the video where the sub-picture is to be synthesized, based on the header information added to the sub-picture pack (step S1).
07). Next, the CPU 11 calculates the relative position of the sub-picture with respect to the VGA graphics screen based on the recognized position on the video and the display position of the video on the VGA graphics screen (step S10).
8). As a result, the address value when the sub-picture is written to the VRAM 20 is determined.

Next, the CPU 11 decodes the sub-picture and restores the sub-picture to an image before encoding on the memory 12 (step S109). Here, the decoding process executed corresponds to the run-length encoding performed on the sub-picture.

After that, the CPU 11 transfers the sub-picture image in the memory 12 to the multimedia display controller 19 and writes it in the VRAM 20 (step S110).

The processes of steps S102 to S110 are repeatedly executed on the MPEG bit stream from the SD-ROM drive 21 until the reproduction of the moving image is completed (step S111).

Next, with reference to FIG. 6, the flow of data during movie playback in the system of FIG. 1 will be described.

When a transfer command is issued from the CPU 11, an MPEG stream is read from the SD-ROM drive 21, and the MPEG stream is read at a transfer rate of 9.5 Mbps.
The data is transferred to the data buffer 162 of the CSI interface. Next, the MPEG stream is sent to the CPU 11, where the packs are distributed as described with reference to FIG.

The MPEG video is sent to an MPEG2 video decoder 181 where it is restored to the original main video before encoding. Sub-pictures such as subtitles are restored to character patterns on the memory 12 by the CPU 11 and sent to the multimedia display controller 19. As a result, as shown in the figure, a character pattern is drawn at a predetermined position in the color key area (shown by oblique lines) of the VGA graphics. The audio is decoded by the audio decoder 183 and reproduced.

The restored main video is sent to the multimedia display controller 19 as digital YUV data, where it is synthesized on a color key area (shown by oblique lines) of VGA graphics including sub-pictures.

In this way, the main video including subtitles is displayed on the VGA graphics, and the audio is reproduced in synchronization with the screen.

As described above, in this embodiment, S
Video data and audio data included in the MPEG bit stream read from the D-ROM drive 21 are stored in an MP provided in the system.
The EG2 is decoded by the video decoder 181 and the audio decoder 183, and the sub-picture is decoded by software processing by the CPU 11. In this case, the decoded sub-picture is stored in the VR in the same manner as in normal VGA graphics.
It is drawn on AM20. The image of the sub-picture drawn in the VRAM 20 is transmitted to the MPEG2 video decoder 1 by the multimedia display controller 19.
The video is combined with the video from 81 and displayed on the screen.

As described above, the decoding of the sub-picture and the VRAM 2
Since drawing to 0 is performed, it is not necessary to provide sub-picture decoding logic inside the system, and the hardware configuration can be simplified.

Next, a system configuration according to a second embodiment of the present invention will be described with reference to FIG. The system shown in FIG. 7 is obtained by applying the system configuration of the desktop personal computer shown in FIG. 1 to a notebook type portable computer. The system shown in FIG.
Only the following points are different from the system of the first embodiment.

That is, here, the MPEG2 video decoder 18 is realized not on the system board as shown in FIG. 1 but on the PC card 22, and the PC card controller 23 has the audio controller 17 and the multimedia display controller 19 respectively. The interface with is provided.

The PC card 22 conforms to the PCMCIA specification, is mounted in a card slot of a notebook type portable computer, and is connected to a PC card interface (connector) in the slot.

The PC card 22 has a CIS (Card Infor
mation structure) 221 and an MPEG2 decoder 222. MPEG2 decoder 22
2 is the MPEG2 video decoder 18 of FIG. 1 except for the interface with the audio controller 17 and the multimedia display controller 19, respectively.
It has exactly the same function as that described above, and its configuration is as described with reference to FIG.

The PC card controller 23 has a CPU 1
Under the control of the various PCs installed in the PC card slot
It is for controlling the C card and has two operation modes, mode 1 and mode 2. Mode 1 is for controlling a normal PC card such as a modem card or the like. Data is transferred between the system bus 10 and the PC card, and the audio bus 18a and the video bus 18b are not used.

Mode 2 is a mode used when the PC card 22 is inserted in the PC card slot. In this mode 2, the PC card controller 23 transfers the video and audio streams transferred from the CPU 11 to the PC card 22,
Digital audio data and digital YUV returned from the card 22, for example, via different signal lines
The data is transferred to the audio controller 17 and the multimedia display controller 19 via the audio bus 18a and the video bus 18b, respectively.

FIG. 8 shows the configuration of the PC card controller 21.

The PC card controller 21 is provided with a data transfer control logic 231 and a mode register 232. By setting a mode designation flag in the mode register 232, the PC card controller 23
Operation mode is switched.

The setting of the mode designation flag is performed by the CPU 11 when the system power is turned on, for example. That is, the CPU 11 reads the attribute information from the PC card inserted in the PC card slot, and detects the type of the inserted PC card based on the attribute information. If the mounted PC card is the PC card 22, the CP
U11 sets a mode designation flag indicating mode 2 in the mode register 232.

[0077]

As described above, according to the present invention, a process of reading a digital data stream from a storage medium by software processing by a CPU, and a process of reading a moving picture packet, a sub-picture packet, The processing of separating the audio packet and the processing of allocating the separated moving picture packet, sub-picture packet and audio packet to the video decoding means, the sub-picture decoder means, and the audio decoding means, respectively, are performed. Simplification can be achieved.

[Brief description of the drawings]

FIG. 1 is a multimedia P according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a system configuration of C.

FIG. 2 shows an SD-R used in the system of the first embodiment.
FIG. 2 is a block diagram illustrating a configuration of an OM drive.

FIG. 3 is a view showing a recording format of moving image data used in the system of the first embodiment.

FIG. 4 shows the MPEG provided in the system of the first embodiment.
FIG. 2 is a block diagram showing an example of a specific configuration of a decoder.

FIG. 5 is a flowchart illustrating a sub-picture decoding operation executed by a CPU in the system of the first embodiment.

FIG. 6 is an exemplary view for explaining a data flow at the time of moving image reproduction in the system of the first embodiment.

FIG. 7 shows a multimedia P according to a second embodiment of the present invention.
FIG. 2 is a block diagram showing a system configuration of C.

FIG. 8 is a block diagram showing a configuration of a PC card controller provided in the system of the second embodiment.

[Explanation of symbols]

10 System bus, 11 CPU, 12 System memory, 16 SCSI interface, 17 Audio controller, 18 MPEG2 decoder, 19
Multimedia display controller, 20: video memory, 21: SD-ROM drive, 22: PC card, 23: PC card controller, 121: MPE
G driver, 161, SCSI controller, 162 ...
Data buffer, 181: MPEG2 video decoder, 182: Sub-picture decoder, 183: Audio decoder.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H04N 5/937 H04N 5/93 C 7/08 7/08 Z 7/081

Claims (5)

[Claims] 1. A disk drive device capable of driving a recording medium in which moving image data, sub-picture data, and audio data are multiplexed and recorded as digital compression-encoded digital data strings, In a computer system capable of reproducing a digital compression-encoded digital data sequence recorded on the recording medium, the digital compression-encoded digital data sequence includes:
The packet data of the moving image data, the sub-picture data, and the audio data are multiplexed with an ID indicating the packet type added thereto, and the digital compression-encoded digital data string is read from the storage medium. In the case of reproduction by the CPU, the CPU of the computer system that executes an operating system and an application program on a memory is caused to execute a reproduction program for reproducing the digital data string that has been subjected to the digital compression encoding. A process of reading the digital data string subjected to the digital compression encoding from at least the storage medium;
A process of separating a moving image packet, a sub-image packet and an audio packet from the read digital data sequence based on the ID, and providing the separated moving image packet, sub-image packet and audio packet in the computer system, respectively. A computer system comprising: means for executing processing for sorting to video decoding means, sub-picture decoding means, and audio decoding means. 2. A disk drive device capable of driving a recording medium in which moving image data, sub-picture data, and audio data are multiplexed and recorded as digital data strings subjected to digital compression encoding, and are connectable. In the moving image reproducing method in the computer system capable of reproducing the digital compression-encoded digital data sequence recorded on the recording medium, the digital compression-encoded digital data sequence includes:
The packet data of the moving image data, the sub-picture data, and the audio data are multiplexed with an ID indicating the packet type added thereto, and the digital compression-encoded digital data string is read from the storage medium. In the case of reproduction by the CPU, the CPU of the computer system that executes an operating system and an application program on a memory is caused to execute a reproduction program for reproducing the digital data string that has been subjected to the digital compression encoding. A process of reading the digital data string subjected to the digital compression encoding from at least the storage medium;
A process of separating a moving image packet, a sub-image packet and an audio packet from the read digital data sequence based on the ID, and providing the separated moving image packet, sub-image packet and audio packet in the computer system, respectively. A video decoding method in a computer system, which executes a process for allocating to a video decoding means, a sub-picture decoder means, and an audio decoding means. 3. A moving image data including a sub-video is connected to a disk drive device capable of driving a recording medium on which digital compression encoding is performed and recorded, and the digital compression encoding is performed and recorded on the recording medium. A computer system capable of reproducing moving image data including sub-pictures, by executing an operating system and executing a reproducing program for reproducing moving picture data including the digital compression-encoded sub-pictures. A CPU for reproducing a moving image recorded on the recording medium, display means for synchronizing the reproduced moving image data and sub-video, and synthesizing and displaying a main video including subtitles on graphics, and synchronizing with the displayed video And a means for reproducing sound. 4. The CPU executes the playback program to cause the CPU to separate at least a sub-picture and a moving picture data from a digital data sequence read from the disk drive device, and decode the separated sub-picture. 4. The method according to claim 3, wherein
Computer system as described. 5. The moving picture data including the sub-picture is an MPE
4. The computer system according to claim 3, further comprising moving picture data digitally compressed and encoded according to the G2 standard, wherein the reproduction program includes at least an MPEG driver.