JPH10162484A - Device and method for controlling video cd reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly resume reproducing from a reproducing interrupted spot without any time delay when a power source is switched ON again after the power source is switched OFF in a video CD reproducing device. SOLUTION: Sequence header data for setting the operation mode of an MPEG decoder 3 is stored beforehand in a storage unit 8 at the time of starting video CD reproducing, reproducing interrupted spot information is also stored beforehand in the storage unit 8 when a power source is switched OFF temporarily, and when the power source is switched ON again, control is performed again by reading the sequence header data and the reproducing interrupted spot information from the storage unit 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a playback apparatus for a video CD recorded with information compression coding by the MPEG1 method or the like, and more particularly to a playback apparatus in which power is once turned off during playback and then turned on again. Related to playback control.

[0002]

2. Description of the Related Art Conventionally, in a video CD reproducing apparatus of this kind, when a power supply is once turned off during reproduction of a video CD and then turned on again, an operation mode of a decoder such as an MPEG system is designated. The sequence header data is read from the video CD again, and reset to the decoder.

A specific example will be described below.

FIG. 7 is a block diagram showing the structure of the prior art.
FIG. 8 is a flowchart showing a control method according to the related art. The CPU 5 controls the CD drive 1, the video CD unit 4 including the CD-ROM decoder 2 and the MPEG decoder 3, and the storage unit 7. Video CD during playback of Video CD
When the power of the unit 4 is turned off (steps 10 to 13),
The MPEG decoder 3 loses the image sequence header previously held inside the decoder 3. Further, the information of the reproduction interruption point is stored in the storage unit 7 as it is.

Next, when the power is turned on (step 1)
In step 4), the CPU 5 instructs the CD drive 1 to perform a seek operation to the beginning of the image data in step 15 of the processing. When the sequence header is input to the MPEG decoder 3 in step 16, the reproduction stored in the storage unit 7 is interrupted. The location information is read, and in step 17, a seek operation to the location where the image data is interrupted is instructed, and the reproduction is resumed.

There is a similar recovery process when the power is turned on for a music CD or the like. However, since a music CD can be reproduced from the middle, it is necessary to remember the return destination position (minute, second, frame). The control is completely different from the present invention in terms of the data structure.

FIG. 9 shows an MPE used in a video CD.
The contents of the sequence header data of the image data compressed and encoded by the G1 method are illustrated.

[0008]

The conventional video CD
In the reproduction control method of (1), when the power is turned on again and the reproduction is resumed, it is necessary to read the sequence header data from the video CD again, which causes a time delay before the reproduction is started. Was.

For example, in order to reproduce an image compressed and encoded by the MPEG1 system, a sequence header including information (number of pixels, number of lines, etc.) necessary for decoding an original image is transmitted to an MPEG decoder. Must be entered. Since this sequence header is located at the beginning of the image data, the image data may be input from the beginning during normal playback.
When it becomes FF, the sequence header held by the MPEG decoder is lost.

When the power is turned on again, in order to resume the reproduction from the place of the interrupted image data, the sequence header at the head of the image data is input to the MPEG decoder as described first. Then, it is necessary to perform a seek operation to the head of the image data, and to seek again to the reproduction restart position after inputting the sequence header.

As described above, it takes a long time until the reproduction of the image is restarted due to the time-consuming seek operation.

[0012]

According to the structure of the present invention, a sequence header for setting an operation mode of a decoder read from a video CD at the start of reproduction of the video CD is provided.
A video CD reproducing apparatus comprising: a nonvolatile storage unit for storing data and, when the power is once turned off, a reproduction interruption portion information of a video CD being reproduced; At the start of playback, the playback device stores the sequence header data read from the video CD in a non-volatile storage unit. When the power is temporarily turned off during playback, information on the interrupted playback location of the video CD being played back is stored. Is stored in the non-volatile storage unit, and when the power is turned on again, the sequence header data and the reproduction interruption location information stored in the non-volatile storage unit are read out from the non-volatile storage unit, and the reproduction is performed. This is a control method for a video CD playback device that controls restarting.

[0013]

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

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention, and FIG. 2 is a flowchart showing the control contents.

Image data compressed and encoded according to the MPEG1 system is input from a CD drive 1 to a CD-ROM decoder 2. The sequence header data is detected by the pattern detection circuit 6 built in the CD-ROM decoder 2 and stored in the RAM 8 of the storage unit (flow 2).
1). If the power is turned off during image reproduction, the CD drive is instructed to stop (flow 11.12.1).
3). When the power is turned on again, the CPU 5
The sequence header data stored in M8 is input to the MPEG decoder 3 (flow 22). After that, the CD drive is instructed to perform a seek operation to the playback interruption point, and the playback processing is restarted (flows 17 and 18).

FIG. 3 is a block diagram showing the configuration of the second embodiment of the present invention, and FIG. 4 is a flowchart showing the control contents.

Image data compressed and encoded by the MPEG1 system is input from the CD drive 1 to the CD-ROM decoder 2 and is input to the pattern detection circuit 6 (flow 22). The pattern header is detected by the pattern detection circuit 6 and stored in the RAM 9 inside the CPU 5 (flow 24).

If the power is turned off during image reproduction, C
Instruct the D drive to stop (flows 11 and 12)
・ 13). When the power is turned on again, the CPU 5 inputs the sequence header data stored in the internal RAM 9 to the MPEG decoder 3 (flow 25). After that, the CD drive is instructed to perform a seek operation to the playback interruption point, and the playback processing is restarted (flows 17 and 18).

FIG. 5 is a block diagram showing a configuration of the third embodiment of the present invention, and FIG. 6 is a flowchart showing control contents.

Image data compressed and encoded by the MPEG1 system is input from the CD drive 1 to the CD-ROM decoder 2 and is input to the CPU 5 (flow 2).
6). The CPU 5 checks the input data, detects the sequence header data, and stores it in the internal RAM 9 (flow 27).

If the power is turned off during image reproduction, C
Instruct the D drive to stop (flows 11 and 12)
・ 13). When the power is turned on again, the CPU 5 inputs the sequence header data stored in the internal RAM 9 to the MPEG decoder 3 (flow 25). After that, the CD drive is instructed to perform a seek operation to the playback interruption point, and the playback processing is restarted (flows 17 and 18).

[0022]

As described above, according to the video CD reproducing apparatus and the control method thereof of the present invention, when the reproduction is resumed, the operation of reading the sequence header data from the video CD becomes unnecessary, and the time delay until the reproduction is resumed. Is eliminated, and there is an effect that playback can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a flowchart showing control contents according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a flowchart showing control contents according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 6 is a flowchart showing control contents according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional technique.

FIG. 8 is a flowchart showing control contents according to the related art.

FIG. 9 is a diagram showing an example of the contents of sequence header data.

[Explanation of symbols]

Reference Signs List 1 CD drive 2 CD-ROM decoder 3 MPEG decoder 4 Video CD unit 5 CPU 6 Sequence header data detection / output unit 8 Sequence header data storage unit (RAM) 9 Sequence header data storage unit (CPU internal R
AM) 10 Start image playback processing 11 Image playback processing 12 Check power ON 13 Stop instruction processing to CD drive 14 Check power OFF 15 Instruct CD drive to seek image data head 16 Read sequence header and input to MPEG decoder 17 Instructs the CD drive to seek to the point where playback is interrupted 18 Resumes playback processing 19 Inputs a sequence header from the sequence header detection / output unit to the storage unit 20 MPs the sequence header stored in the storage unit
Processing to be input to the EG decoder 21 Detecting inside the CD-ROM decoder and writing the sequence header to RAM 22 Sequence header stored in RAM to MP
Input to EG decoder 23 Input data from CD-ROM decoder to pattern detection circuit 24 Store sequence header detected by pattern detection circuit in internal RAM of CPU 25 Sequence header stored in internal RAM of CPU to MPEG decoder Input 26 Input data from CD-ROM decoder to CPU 27 Monitor data with CPU and store detected sequence header in internal RAM

Claims (2)

[Claims] At the start of playback of a video CD, a video CD
A non-volatile storage unit for storing sequence header data for setting the operation mode of the decoder read out from the storage unit, and for storing information of a reproduction interruption portion of the video CD being reproduced when the power is once turned off. A video CD playback device. 2. At the start of playback of a video CD playback apparatus, sequence header data read from a video CD is stored in a non-volatile storage unit. The reproduction interruption section information is stored in the nonvolatile storage section, and when the power is turned on again, the sequence header data and the reproduction interruption section information stored in the nonvolatile storage section are read out from the nonvolatile storage section. And controlling the video CD playback apparatus to resume playback.