JPH10161630A - Dynamic image data output device and method for betting its environment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically set the environment in the dynamic image data output of a dynamic data output device according to the kind of a display card to be used. SOLUTION: Two interfaces for ZV port and VMI are prepared in a DVD decoder 18 as the interface for outputting a dynamic image data to the video input port of a display controller 19 so that it is conformable to both interfaces of ZV port and VMI. Which output interface is to be used is automatically switched according to the kind of the display controller 19 instructed by a CPU 11. Thus, when the display controller 19 is replaced by a user, the output interface according to the new display controller can be automatically switched, and a dynamic image transfer according to the display controller to be used can be regularly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image data output device and an environment setting method thereof, and more particularly to a moving image data output device capable of outputting moving image data to a video input port of a display control device and an environment setting method thereof.

[0002]

2. Description of the Related Art In recent years, multimedia has been developed in the field of personal computers, and various devices for handling moving image data have begun to be mounted on systems. Examples of these devices are shown below.

(1) Video capture: An analog video signal from a video device such as a video camera is converted into digital data and input. (2) MPEG decoder: expands the moving image data compressed by MPEG to generate raw moving image data.

(3) High-speed serial interface such as IEEE 1394 (P1394): Inputs moving image data transferred from a digital video camera, digital video player, or the like.

A digital video interface for efficiently transferring moving image data output from these devices to a display card includes a ZV port and a VM.
I and the like are known. These digital video interfaces are dedicated video interfaces for directly transferring video data from a video data output device to a video input port of a display card without passing through a system bus.

[0006]

However, the digital video interface has various standards and specifications such as the above-mentioned ZV port and VMI, and the timing of moving image data to be output from a moving image data output device. Depends on the display card used.

For this reason, for example, when a user exchanges a display card, moving image data from a moving image output device cannot be directly transferred to a new display card. Even if the digital video interface corresponding to the card is supported, there is a problem that the user needs to manually set the output interface of the moving image output device. Another problem is that the luminance and hue of the moving image data displayed on the screen change due to the difference in the characteristics of the display card.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and enables an environment for outputting moving image data of a moving image data output device to be automatically set in accordance with a type of a display card to be used. It is an object of the present invention to provide a moving image data output device capable of performing a moving image display and an environment setting method thereof.

[0009]

SUMMARY OF THE INVENTION The present invention provides a moving picture data output device used in a computer system which has a video input port and which can display a moving picture data inputted from the video input port. A plurality of output interfaces for outputting moving image data to a video input port of the display control device, and the plurality of output interfaces according to a type of the video input port of the display control device instructed by a CPU of the computer system. Means for selectively switching the output interface.

In this moving image data output device,
A plurality of output interfaces for outputting moving image data to a video input port of the display control device are provided,
It is configured to be compatible with multiple types of digital video interfaces. Which output interface to use is automatically switched according to the type of the video input port of the display control device instructed by the CPU. Therefore, even when the user exchanges the display control device,
The display interface can be automatically switched to an output interface that matches the video input port of the new display control device, and moving images can be transferred in accordance with the display control device that is always used.

The moving image data output device is provided with a luminance conversion table and a hue conversion table, and the contents of these tables are automatically rewritten according to the type of the display control device detected by the CPU. Therefore, it is possible to display a high-quality moving image that matches the characteristics of the display control device used.

[0012]

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, and as shown in FIG.
Bus 10, CPU 11, main memory (MEM) 12, HD
D13, a DVD interface 16 composed of an ATAPI or SCSI interface, an audio controller 17, a DVD decoder 18, a multimedia display controller 19, and a video memory (VRAM) 20 for storing moving image data encoded by MPEG2. The stored DVD-ROM drive 21 is connected to the DVD interface 16.

The DVD-ROM drive 21 reads a data stream stored on a DVD having a storage capacity of about 10 GB on both sides of the disk at a maximum transfer rate of 10.8 Mbps. That is, in the data stream recorded on the DVD medium, a time stamp indicating the read time is written for each sector of a fixed length (2048 bytes), and the DVD-ROM drive 21 measures the time by a clock. When the time specified by the time stamp is reached, the sector is set to 10.8 Mb.
Read at a transfer rate of ps.

As shown in FIG. 2, the DVD-ROM drive 21 includes a DVD medium 211 composed of an optical disk, a motor 212, a pickup 213, a pickup drive 214, and a servo controller 21.
5 and a drive controller 216 including an ECC circuit for error detection and correction. 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 DVD medium 211 and reading data recorded on the DVD medium 211.

The DVD medium 211 can record, for example, a movie of about 135 minutes on one side. 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,
The audio and the audio are recorded after being digitally compressed and encoded according to the MPEG2 standard. According to the MPEG2 standard, data encoded by MPEG2 can include other encoded data, and the encoded data is treated as one MPEG2 program stream (digital data stream).

MPEG2 is used for video encoding,
Run-length coding and DOLBY AC3 are used for sub-picture and audio coding, respectively. Even in this case, the encoded video, sub-picture, and audio are treated as one MPEG2 program stream.

The encoding processing of the MPEG2 standard is variable rate encoding, and the amount of information to be recorded / reproduced per unit time can be varied. Therefore, the higher the moving rate of the scene, the higher the transfer rate of the MPEG stream constituting the frame group corresponding to the scene, the higher the quality of the moving image can be reproduced.

In order to utilize such features of MPEG2, in this embodiment, movie information is recorded on the DVD medium 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 constitutes 15 frames of information necessary for reproducing a moving image for a certain period of time, for example, 0.5 seconds, and is a GOP (Group of).
picture). Each data block contains
Video pack (VIDEO pack), sub-picture pack (SP pack), and audio pack (AUD pack)
IO packs) are multiplexed and recorded. These video packs (VIDEO packs), sub-picture packs (SP packs), and audio packs (AUDI packs)
O-pack) is a coded video, sub-picture, and audio data unit. The data size of these packs is equivalent to the above-mentioned sector size and 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. .

In the DVD, a multi-story function for selecting and playing back a scene group corresponding to a scenario designated by the user among a plurality of scenarios, and a user designated in a plurality of videos having different photographing angles. It also has a multi-angle function for selecting and playing back images at different angles.

These functions are such that a plurality of videos corresponding to a multi-story and a multi-angle are multiplexed in units of, for example, data blocks, and the position and the position of the data block for each story or angle are determined by disc search map information or the like. This is achieved by managing connections.

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. DVD-RO
Reading and reproduction of data recorded in the M drive 21 are executed by causing the CPU 11 to execute a DVD control driver.

The DVD interface 16 is an HDD or C
A peripheral interface for connecting a peripheral device such as a D-ROM to the PCI bus 10. In this embodiment,
Data transfer with the DVD-ROM drive 21 is performed. DVD-ROM by DVD interface 16
The data read from the drive 21 is temporarily stored in the memory 12 and then transferred to the DVD decoder 18.

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 DVD decoder 18 are input to the multiplexer 173, and one of them is selected.

The digital audio data is a DVD-R
The audio data read from the OM drive 21 is decoded. Audio data is transferred from the DVD decoder 18 to the audio controller 17 through the audio bus 18a.
Bus 10 is not used. Therefore, digital audio data can be transferred at a high speed without affecting the performance of the computer system.

The DVD decoder 18 reads the MPEG22 program stream from the memory 12 under the control of the CPU 11, separates it into video, sub-picture, and audio packets, decodes them, synchronizes them, and outputs them. . The DVD decoder 18 is realized, for example, as a PCI expansion card that can be removably inserted into a PCI expansion slot of the computer system. As shown in the figure, a transaction control unit 201, a FIFO buffer 202, and an MP
An EG2 decoder 203 is provided. The transaction control unit 201 connects the DVD decoder 18 to the PCI bus 10
The memory 12 operates as a bus master (initiator) for issuing a transaction.
Read MPEG2 program stream from D
Execute by MA transfer. This MPEG2 program stream is transmitted to the MPEG buffer via the FIFO buffer 202.
2 decoder 203, where separation into video, sub-picture and audio packets and their decoding are performed.

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 and sub-picture are combined and sent to the multimedia display controller 19 as digital YUV data. In this case, the digital Y from the DVD decoder 18 to the video input port of the multimedia display controller 19
The video bus 18b is used for transferring the UV data.
The system bus 10 is not used. Therefore, digital Y
Similarly to digital audio data, the transfer of UV data can be performed at high speed without affecting the performance of the computer system.

The video bus 18b is composed of a flat cable and can support both a ZV port and a VMI. The DVD decoder 18 also has a function of converting digital YUV data and audio data into an NTSC TV signal and outputting the signal to an external video input of the TV receiver. Transmission of the TV signal from the DVD decoder 18 to the TV receiver can be easily performed by connecting a cable provided to the TV receiver to a connector provided on a card of the DVD decoder 18.

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 a VGA specification text and graphics display as well as a moving image display. . The multimedia display controller 19 is realized, for example, as a PCI expansion card that can be removably inserted into a PCI expansion slot of the computer system.
9 includes a graphics display control circuit (Graphics) 191, a video display control circuit 192, a multiplexer 193, a D / A converter 194, and the like, as illustrated.

The graphics display control circuit 191 controls V
This is a GA compatible graphics controller, which converts VGA graphics data drawn in a video memory (VRAM) 20 into RGB video data and outputs it.
The video display control circuit 192 includes a video buffer for storing digital YUV data, and a Y buffer stored in the buffer.
YUB-R for converting UB data to RGB video data
It has a GB conversion circuit and the like.

The multiplexer 193 selects one of the output data of the graphics display control circuit 191 and the video display control circuit 192, or converts the video output from the video display control circuit 192 onto the VGA graphics from the graphics display control circuit 191. The combined data is 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 203. This MPEG2 decoder 2
03, three decoders corresponding to video, sub-picture, and audio, that is, an MPEG2 video decoder 181, a sub-picture, for synchronizing decoding and reproduction of the multiplexed video, sub-picture, and audio bit streams. A decoder 182 and an audio decoder 183 are provided.

The MPEG2 video decoder 181,
The sub-picture decoder 182 and the audio decoder 183 are connected via an internal bus. MPE
The G2 video decoder 181 and the sub-picture decoder 182 each have R
AMs 184 and 185 are provided.

The MPEG2 video decoder 181 has the FI
Multiplexed MP received via FO buffer 202
This is for decoding video data included in the EG stream, and separates the received MPEG stream into video, sub-picture, and audio for each pack by using the stream ID described in FIG. Is decoded. The sub-picture and the audio pack separated by the MPEG2 video decoder 181 are sent to the sub-picture decoder 182 and the audio decoder 183, respectively.

The sub-picture decoder 182 is an MPEG
The sub-picture pack separated by the two video decoder 181 is decoded. The types of decoding performed here include the encoding performed on the sub-picture,
That is, it corresponds to run-length encoding. Further, the sub-picture decoder 182 receives the video decoded by the MPEG2 video decoder 181, and combines the video with the sub-picture decoded by the sub-picture decoder 182. The sub-picture combining position is determined by the position information included in the header portion added to the sub-picture packet. The synthesized YUV data is converted into a luminance and a hue according to the characteristics of the display controller 19 via a luminance / hue conversion circuit 187, and a video interface switching circuit 188.
Is transferred to the display controller 19 at an output interface and timing corresponding to the video input port of the display controller 19.

The luminance / hue conversion circuit 187 is
The conversion table is composed of three conversion tables that can be rewritten, namely, a luminance pallet as a conversion table for luminance data Y, a U pallet as a conversion table for U data, and a V pallet as a conversion table for V data. The video interface switching circuit 188 selectively uses two digital video interface circuits of the ZV port and the VMI, and determines which interface circuit to use depending on the result of the determination of the type of the display controller 19 by the CPU 11. It is determined.

The audio decoder 183 is an MPEG2
The audio pack separated by the video decoder 181 is decoded. The type of the decoding process executed here includes the encoding process performed on the audio data,
That is, it corresponds to DOLBY AC3. The decoded audio packet is output as digital audio data.

The digital YUV data is sent to the display controller 19 as described above,
It is sent to a C interface 186, where it is converted to a TV signal. The digital audio data is sent to the audio controller 17 and sent to the audio DAC 189, where it is converted into an audio analog signal.

As described above, the DVD decoder 18 has a ZV as an output interface for outputting moving image data to the video input port of the display controller 19.
Two interfaces, one for a port and one for a VMI, are provided, and are configured to be compatible with either a ZV port or a VMI digital video interface. Which output interface to use is automatically switched according to the type of video input port of the display controller 19 instructed by the CPU 11. Therefore, even when the user replaces the display controller 19, the display controller 19 is automatically switched to an output interface that matches the video input port of the new display controller, and the moving image transfer that matches the display controller that is always used is performed. It is possible to do. Further, the DVD decoder 18 is provided with tables for luminance conversion and hue conversion, and the contents of these tables are automatically rewritten according to the type of the display controller detected by the CPU 11. Therefore, it is possible to display a high-quality moving image that matches the display characteristics of the display controller used.

Next, the configuration of the display controller 19 necessary for determining the type of the display controller 19 will be described with reference to FIGS. In FIG.
The configuration space of the display controller 19 is shown. This configuration space is provided with a group of registers such as a vendor ID register (Vendor ID), a device ID register (Device ID), and a class code register (CLASS Code). Information necessary for identification is set.

Vendor ID register (Vendor I)
D) R1 is a read-only 16-bit register as shown in FIG. 6, and VID15... VID0 indicates the vendor ID of the display controller 19. Device ID register (Device ID) R2
Is a read-only 16-bit register as shown in FIG. 7, and the device ID of the display controller 19 is indicated by DID15... DID0. The class code register (CLASS Code) R3 is a read-only 32-bit register. The upper 8 bits BCC7... BCC0 indicate the basic class code of the display controller 19 and the middle 8 bits SCC.
7... SCC0 indicate a subclass code, and the lower 8 bits PIC7.

The DVD decoder environment automatic setting program executed by the CPU 11 reads the register information of the configuration space to determine the type of the display controller used.

FIG. 9 shows the configuration of a luminance pallet data register r1 for writing pallet data into a luminance pallet provided in the luminance / hue conversion circuit 187 of the DVD decoder 18. The luminance pallet data register r1 is an 8-bit register readable / writable by the CPU 11, and pallet data is written to the luminance pallet via the register r1.

FIG. 10 shows the luminance of the DVD decoder 18.
An example of a luminance conversion characteristic by a luminance palette provided in the hue conversion circuit 187 is shown. The luminance palette pointer on the horizontal axis is an index value that specifies a plurality of entries in the luminance palette, and one of the entries is selected according to the Y value of the decoded moving image data. The Y pallet value on the vertical axis is a converted luminance value output from the luminance pallet, and the luminance value is determined by the contents of pallet data set in a plurality of entries in the luminance pallet. The content of the pallet data set in the brightness pallet is determined by the type of the display controller. For example, in the case of the display controller A, data as indicated by a broken line is set.
If the new display controller is the display controller B, the data content set in the luminance palette is rewritten by the DVD decoder environment automatic setting program as shown by the solid line.

FIG. 11 shows a luminance palette provided in the luminance / hue conversion circuit 187 and a circuit configuration around it. The luminance palette 187a is composed of a 256-byte memory (SRAM), and converts the luminance value of the video data according to the content of the stored data as described with reference to FIG. That is, there are various types of display controllers to which the DVD decoder 18 is directly connected, and depending on the characteristics of the display controllers, the brightness of the moving image is insufficient and only the moving image display section on the screen becomes dark. May occur. For this reason, it is necessary to perform appropriate luminance conversion suitable for the characteristics of the display controller using the luminance palette 187a.

The luminance palette 187a is a table having a structure of 256 entries × 8 bits. Only luminance Y is extracted from YUV422 data as a decoding result, and the extracted luminance Y is input as an index value of the table, that is, an SRAM address. The data set in the entry specified by is output as converted Y data.

At the time of writing the palette data to the brightness palette 187a, the address value is sequentially counted up by the 8-bit counter 187b, and the palette data (write data) for each entry.
Is given to the luminance palette 187a. At this time, the read / write control circuit 187c sets the SRAM of the luminance pallet 187a in a write enable state, and the multiplexer 187d selects the output of the 8-bit counter 187b as the input address of the SRAM. Thus, pallet data is sequentially written for each entry.

On the other hand, when data is read from the luminance palette 187a, that is, when the luminance is converted, the luminance palette 1 is read by the read / write control circuit 187c.
The SRAM 87a is in an output enable state, and the value of the luminance data before conversion is changed to a multiplexer 187d.
Is selected as an input address of the SRAM. As a result, the palette data of the entry specified by the luminance data before the conversion is output as the luminance data after the conversion.

FIG. 12 shows the configuration of a video mode register for controlling the video interface switching circuit 188 of the DVD decoder 18. The video mode register r2 is provided in the DVD decoder 18 and is readable / writable by the CPU 11. By rewriting the lower two bits of the video mode designation data VMOD1 and VMOD0 of the video mode register r2, the output timing of video data and the pin arrangement can be switched. FIG. 13 shows the correspondence between the contents of the video mode designation data VMOD1 and VMOD0 and the video output mode.

That is, when VMOD1 and VMOD0 are "0" and "0", the video output from the DVD decoder 18 is set to the disabled state, and the transfer of the moving image to the display controller is prohibited. VMOD1, V
When MOD0 is "0" or "1", the video output interface in the VMI compatible mode is selected, and the pin arrangement and output timing for video data output conform to the VMI standard. When VMOD1 and VMOD0 are "1" and "0", the video output interface in the ZV port compatible mode is selected, and the pin arrangement and output timing for outputting the video data conform to the ZV port standard.

The 38 pins for the video interface provided in the DVD decoder 18 are used as shown in FIG. 14 in the ZV port compatible mode, and are used as shown in FIG. 15 in the VMI compatible mode. Video data output timings in the ZV port compatible mode and the VMI compatible mode are as shown in FIGS. 16 and 17, respectively. Since the timings in FIGS. 16 and 17 are defined by the respective standards, detailed description thereof is omitted here.

FIG. 17 shows an example of a specific configuration of the video interface switching circuit 188 provided in the DVD decoder 18. As shown, the video interface switching circuit 188 includes a ZV port interface circuit 188a, a VMI interface circuit 188b, and a number of selector circuits S1, S2,.
Is provided. Interface circuit 1 for ZV port
88a and the VMI interface circuit 188b
Are circuits for outputting video data at the timings of FIGS. 16 and 17, respectively. The selector circuits S1, S2,... Are for switching the pin arrangement between the ZV port compatible mode and the VMI compatible mode as shown in FIGS. 14 and 15, and the output from the ZV port interface circuit 188a and the VMI interface Circuit 1
Alternatively, the output from 88b is selected and connected to the corresponding pin. The selection operation is performed by the above-described VMOD1, VMO
It is controlled by a switching signal generated from D0.

Next, the procedure of the DVD decoder automatic setting processing executed by the DVD decoder environment automatic setting program will be described with reference to the flowchart of FIG. In step S101, the DVD decoder environment automatic setting program first finds a display controller by checking the class code register of each device connected to the PCI bus 10. Next, the vendor ID and device ID of the display controller
From the registers R1 and R2 in the configuration space. Then, the type of the video interface supported by the video input port of the display controller is determined from the vendor ID and the device ID.
This determination can be made by, for example, preparing a correspondence table between the vendor ID and device ID and the type of the digital video interface in advance, and referring to the correspondence table.

Next, in step S102, the DVD decoder environment automatic setting program executes the DVD decoder 1 according to the determined type of digital video interface.
8 are set to video mode designation data VMOD1 and VMOD0. For example, if the display controller has a digital video interface compatible with the ZV port, the VMO
D1, VMOD0 are set to "1" and "0".

Thereafter, in step S102, the DVD decoder environment automatic setting program executes the luminance (Y) palette and the hue (U) according to the type of the determined display controller.
V) Rewrite the contents of each palette. This rewriting may be performed by the DVD decoder environment automatic setting program writing pallet data every day.
The palette data may be prepared in the D decoder, and the pallet data may be automatically rewritten in the DVD decoder according to the type of the display controller notified from the DVD decoder environment automatic setting program.

The steps S101 to S103 are executed each time the display controller is changed.
The change of the display controller can be detected by referring to hardware environment information managed by the OS.

In the above description, the DVD decoder 18 has been described as an example of a device for outputting moving image data to the video port of the display controller. Capture, P139
Similarly, environment settings according to the type of the display controller can be automatically performed for the 4 serial interface, the camera card, and the like.

[0061]

As described above, according to the present invention, it is possible to automatically set the environment relating to the moving image data output of the moving image data output device according to the type of the display control device to be used. This makes it possible to display a moving image.

[Brief description of the drawings]

FIG. 1 is an exemplary block diagram showing the configuration of a computer system according to an embodiment of the present invention.

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

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

FIG. 4 is an exemplary block diagram showing an example of a specific configuration of an MPEG2 decoder provided inside the DVD decoder used in the system of the embodiment;

FIG. 5 is an exemplary view showing a configuration space of a display controller used in the system of the embodiment.

FIG. 6 is a diagram showing a configuration of a vendor ID register arranged in the configuration space of FIG. 5;

FIG. 7 is a diagram showing a configuration of a device ID register arranged in the configuration space of FIG. 5;

FIG. 8 is a diagram showing a configuration of a class code register arranged in the configuration space of FIG. 5;

FIG. 9 is an exemplary view showing a configuration of a luminance palette data register provided in a DVD decoder used in the system of the embodiment.

FIG. 10 is an exemplary view showing luminance conversion characteristics of a luminance palette provided in a DVD decoder used in the system of the embodiment.

FIG. 11 is an exemplary block diagram showing a hardware configuration of a luminance palette provided in a DVD decoder used in the system of the embodiment and its periphery;

FIG. 12 is an exemplary view showing the configuration of a video mode register provided in the DVD decoder used in the system of the embodiment.

FIG. 13 shows the contents of the video mode register of FIG. 12 and DV.
The figure which shows the correspondence relationship with the output interface standard of a D decoder.

FIG. 14 is an exemplary view showing correspondence between output pins and video signals in a ZV port compatible mode of the DVD decoder used in the system of the embodiment.

FIG. 15 is an exemplary view showing correspondence between output pins and video signals in a VMI compatible mode of the DVD decoder used in the system of the embodiment;

FIG. 16 is an exemplary timing chart showing video data output timing in a ZV port compatible mode of the DVD decoder used in the system of the embodiment;

FIG. 17 is an exemplary timing chart showing video data output timing in a VMI compatible mode of the DVD decoder used in the system of the embodiment;

FIG. 18 is an exemplary view showing an example of a specific configuration of a video interface switching circuit provided in a DVD decoder used in the system of the embodiment.

FIG. 19 is an exemplary flowchart illustrating the procedure of a DVD decoder automatic environment setting process used in the system of the embodiment.

[Explanation of symbols]

10 System bus, 11 CPU, 12 System memory, 16 ATAPI interface, 17 Audio controller, 18 DVD decoder, 19 Multimedia display controller, 20 Video memory, 21 DVD-ROM drive, 187 Luminance·
Hue conversion circuit, 188: video interface switching circuit, 201: transaction control unit, 202: FI
FO buffer, 203 ... MPEG2 decoder.

Claims (9)

[Claims] 1. A moving image data output device used in a computer system which has a video input port and displays moving image data input from the video input port. A plurality of output interfaces for outputting moving image data to the input port, and according to the type of the video input port of the display control device instructed by the CPU of the computer system,
Means for selectively switching among the plurality of output interfaces. 2. A brightness conversion table, which is configured to be rewritable by a CPU of the computer system and converts a brightness value of moving image data output from the output interface based on the contents of the table, The moving image data output device according to claim 1, wherein a luminance value of the moving image data can be automatically adjusted according to the type of the display control device instructed. And a hue conversion table configured to be rewritable by a CPU of the computer system, the hue conversion table converting a hue of moving image data output from the output interface based on table contents, and being instructed by the CPU of the computer system. 2. The moving image data output device according to claim 1, wherein the hue of the moving image data can be automatically adjusted according to the type of the display control device. 4. A display control device having a video input port and displaying moving image data input from the video input port, and a plurality of output interfaces for outputting moving image data to the video input port, A video data output device that outputs video data to the video input port of the display control device is a computer system that can be used, a means for determining the type of video port of the display control device provided in the computer system, Means for selectively switching the plurality of output interfaces provided in the moving image data output device based on the result of the determination. 5. The video output device is provided with a brightness conversion table for converting a brightness value of video data output from the output interface based on a table content, and the brightness conversion table is provided in accordance with a type of the display control device. 5. The computer system according to claim 4, further comprising means for rewriting the contents of the luminance conversion table and automatically adjusting the luminance value of the moving image data. 6. The video output device is provided with a hue conversion table for converting a hue of video data output from the output interface based on a table content, and the hue conversion table is provided in accordance with a type of the display control device. 5. The computer system according to claim 4, further comprising means for rewriting the contents of the conversion table and automatically adjusting the hue of the moving image data. 7. A display control device having a video input port for displaying moving image data input from the video input port, and a plurality of output interfaces for outputting moving image data to the video input port, A moving image data output device that outputs moving image data to a video input port of the display control device; and a method of setting the environment of the moving image data output device in a computer system capable of using the moving image data output device. An environment setting method for a moving image data output device, comprising: determining a type; and selectively switching the plurality of output interfaces provided in the moving image data output device based on a result of the determination. 8. The moving image output device is provided with a luminance conversion table for converting a luminance value of moving image data output from the output interface based on the contents of the table. 8. The environment setting method according to claim 7, wherein the content of the brightness conversion table is rewritten to automatically adjust the brightness value of the moving image data. 9. The moving image output device is provided with a hue conversion table for converting the hue of the moving image data output from the output interface based on the contents of the table. 8. The environment setting method according to claim 7, wherein the content of the conversion table is rewritten to automatically adjust the hue of the moving image data.