JP3165120B2 - Video playback device, storage medium, and video playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video reproducing apparatus, a storage medium and a video reproducing method using an information recording system of the MPEG standard.

[0002]

2. Description of the Related Art Conventionally, there are video reproducing apparatuses which record a video CD according to an information recording system of the MPEG standard and are defined by three image types, i-picture, P-picture and B-picture. Such a video playback device is
When video reproduction is started on a video CD, an I picture having one piece of video data as one piece of data is first detected in order to prevent the video from being disturbed.

When an I-picture can be detected, video can be reproduced, a CD-compatible drive can be reproduced in a normal mode, and an error can be detected by an MPEG decoder. In the case of error detection, decoding cannot be performed at the time of occurrence of the error, decoding cannot be performed using the MPEG decoder, and the video is stopped. When the video is returned from the stopped state, an I picture at which the error occurrence position is shifted is detected, one video is output, all data is decoded, and reproduction is started.

In the case of fast-forwarding, the CD-compatible drive is driven for several seconds (for example, 5 seconds) in the current playback time (minute, second: frame).
After seeking the added time, an I-picture is detected, and a process of outputting one image is repeated, and the image is reproduced in a discrete manner. For example, in the invention disclosed in Japanese Patent Application Laid-Open No. 9-98430, only the I picture is extracted from the storage medium using the detection flag in order to reduce the load of decoding processing for the I picture for special reproduction. In addition, Japanese Patent Application Laid-Open
According to the invention described in Japanese Patent Application Laid-Open No. 271025, in order to prevent the appearance from being disturbed when an error occurs, the disturbed display of the I-picture is determined, and the processing of freezing the display of the I-picture is performed. Is not affected.

[0005]

However, the conventional video reproducing apparatus is not suitable for a video CD, for example, a video CD in which I pictures are recorded at a long interval of 60 seconds.
When recovering from an error and detecting an I-picture after a seek in fast-forward playback, it takes a maximum of 60 seconds before the video starts, and the video during that time stops over the entire screen and cannot be played back. .

An object of the present invention is to make it possible to detect a video from a storage medium at high speed by controlling a decoder and storing the video.

A further object of the present invention is to make it possible to detect an I picture even in a storage medium having a long I picture interval.

[0008]

A first aspect of the present invention is to seek at an interval of an I picture which is predicted first image data,
Detecting means for detecting a picture at a high speed; means for calculating a difference from a previous I picture each time an I picture is detected;
Registering means for registering picture intervals.

The seek is performed at the interval of the predicted I-picture as the first image data, the detection means detects the I-picture at a high speed, and every time the I-picture is detected, the difference from the previous I-picture is calculated. By registering the intervals of I-pictures by controlling the decoder and storing the video, it is possible to detect the video from the storage medium at high speed.

According to a second aspect of the present invention, the intervals of the I picture are sorted and registered in the recording unit by the registration means.

[0011] By controlling the decoder and storing the video by sorting the intervals of the I-picture and registering it in the recording unit by the registration means, the video is detected at high speed from the storage medium and registered in the recording unit. Can be smoothed.

According to a third aspect of the present invention, the intervals of I-pictures are sorted regardless of the order of the number of times of detection or the order of seek time.

By sorting the intervals of the I-pictures regardless of the order of the number of times of detection or the order of the seek time, the time until restoration can be shortened.

According to a fourth aspect of the present invention, the first interval of the I picture includes address information.

The first interval of I-pictures includes address information, so that registration at I-picture intervals can be expedited.

A detecting means for seeking at the interval of the image data at the interval 1 of the I picture, which is the predicted first image data, and detecting the first image data at a high speed, Means for calculating the difference from the previous first image data each time the data is detected, registration means for registering the interval of the first image data, and setting the latest detection time of the first image data during the normal reproduction process. Storage means.

The seek is performed at the interval of the image data at the interval 1 of the I picture which is the predicted first image data, and the detecting means detects the first image data at high speed, and every time the first image data is detected. Take the difference from the previous first image data,
By registering the interval of the first image data by the registration unit and storing the latest detection time of the first image data during the normal reproduction process, the registration at the I-picture interval can be performed quickly.

According to a sixth aspect of the present invention, seeking is performed at intervals of an I picture which is the first image data, the first image data is detected at a high speed, and each time the first image data is detected, the previous first image data is detected. By taking the difference from the data, registering the interval of the first image data, storing the latest detection time information of the first image data during normal reproduction processing, and sorting and recording the interval of the first image data It is characterized in that it is registered in units.

The seek is performed at the interval of the I picture which is the first image data, the first image data is detected at a high speed, and every time the first image data is detected, the difference from the previous first image data is calculated. Registering the interval of the first image data, storing the latest detection time information of the first image data during the normal reproduction process, sorting the interval of the first image data, and registering it in recording units. Accordingly, it is possible to easily detect an I picture even in a storage medium having a long I picture interval.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a video reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG . 1, the video reproducing apparatus includes a video compact disk (VIDEO-CD) 10, a servo control device 20, a digital signal processing device 30, a CD-ROM.
It mainly comprises a decoder 40, an MPEG decoder 50 and a microcomputer 60.

The video CD 10 controls the rotation of the optical disk in accordance with a control signal from the servo controller 20. The servo controller 20 operates according to a control signal from the microcomputer 60. Digital signal processing device 30
Reads an optical signal from the video CD 10 based on a control signal from the microcomputer 60. The digital signal processing device 30 transmits serial data to the CD-ROM decoder 40, outputs an audio signal to an audio signal terminal, and transmits SUBQ data (the details of the SUBQ data will be described later) to the microcomputer 60. I do.

The CD-ROM decoder 40 decodes serial data transmitted from the digital signal processing device 30 based on a control signal from the microcomputer 60 and sends the decoded data to the MPEG decoder 50 via a data bus.
Send data. This MPEG decoder 50
The EG data is converted into a video coded signal and output to a video signal terminal.

FIG . 2 is a flowchart showing a method of reproducing a video image of a video CD in FIG. When the reproduction process is started, in step S10, I
Detect a picture. Next, the process proceeds to step S20, where the mechanism of the video CD is executed by normal reproduction. Further, in step S30, an I picture is registered by a subroutine. Next, the process proceeds to step S40, where it is determined whether an error has been detected in the I picture. If an error has been detected, if Y, the process returns to step S10, and the detection of an I picture is performed in a subroutine process.

If no error has been detected, if N, the process proceeds to step S50 to determine whether or not the reproduction has been completed. When the reproduction is completed, if the result is Y, the above-mentioned processing is terminated. On the other hand, if the reproduction is not completed, if the result is N, the process returns to step S30 to register the I picture by a subroutine process. Through these processes, I-picture reproduction processing can be performed.

FIG . 3 is a flowchart showing a process after registration of an I picture in the embodiment. In step S60, it is determined whether or not an I picture is detected. When detecting, the process proceeds to step S70 to store the latest I-picture detection time, and further proceeds to step S80 to calculate the interval from the previous detection time. If no I picture is detected in step 60, and if N, the processing after registration is terminated without performing the following processing.

[0027] Furthermore, in step S90, the interval is the determination whether or not the unregistered, when it is registered, when the Y, the process proceeds to step S100, and registers the I picture interval for each track. In step S90, if the interval is not unregistered, or if N, then step S11
It jumps to 0 and counts the number of detections of the registered interval. Further, when the process proceeds to step S110, the number of detections of the registered interval is counted, and further proceeds to step S120.
, The I picture intervals are sorted by the count value, and the above processing is terminated. The processing after the I picture registration is performed as described above.

FIG . 4 is a flowchart showing processing after the detection of an I-picture according to the embodiment. In step S130, the latest I-picture detection time is read.
Proceeding to 140, the I-picture interval is added to the latest detection time. Proceeding to the next step, when the seek time is longer than the error occurrence position, the detection time is used in step S160,
Seek. Next, in step S170, if an I-picture is not detected, the process proceeds to step S180, where it is determined whether or not a timeout has occurred. If a timeout has occurred, the interval is updated to the next value of the I-picture interval, and the addition in step S140 is performed again. Do the processing.

FIG . 5 is a diagram showing an example of image data of an I picture. FIG . 5A shows an example of a data sequence of an I picture, and FIG. And an example of the detection time of the I picture. The I picture interval is the latest I picture detection time minus the previous I picture detection time.
The picture detection time becomes equal to the latest detection time of the I picture. That is, since the images are sorted in descending order of the number of times of detection, I pictures are registered in the order of 60 seconds, 30 seconds, 2 seconds, and 5 seconds.

FIG . 6 is a diagram showing the start of updating when an I picture cannot be detected due to the occurrence of an error. At the start of this update, the I picture interval may be incorrect, and in the I example, the picture interval needs to be updated, so a timeout is determined. In the case of timeout, the process of updating the I-picture interval to the next value and adding it to the latest I-picture detection time is repeated.

FIG . 7 shows a track N in the case of a video CD.
o. FIG. 3 is a diagram showing an example of an I picture interval. In FIG. If an error occurs during playback of 1, the seek position is obtained by adding 0.5 seconds to the latest I-picture detection time. For this seek time, I
If a picture cannot be detected, seek is performed by adding the next two seconds to the latest I-picture time. Thereafter, the data is repeatedly updated until the data can be detected.

In the above embodiment, the track No. Since the number of detections is arranged in units of descending number of detections, the number of detected I-picture intervals is counted, and sorting is performed in descending order of I-picture intervals based on the count value. Since the actual I-picture intervals rarely coincide completely, information on the I-picture intervals is provided within a certain range. As an example, the I picture interval is managed in units of 0.5 seconds, 2 seconds, 5 seconds, 10 seconds,....

Further, in the present embodiment, it is possible to secure the memory for storing the interval between I pictures and the latest detection time of the I picture with the same configuration as that of the related art. The memory for storing the I picture can be realized either in the internal area of the microcomputer or in the external area of the microcomputer.

When the video CD 10 is reproduced, in order to prevent the video from being disturbed, one piece of data starts from detecting an I picture having one piece of video data. In the above embodiment, as shown in FIG. 2, the reproduction process of the I picture is executed, and after the detection of the I picture, the CD mechanism is executed by the normal reproduction, and the reproduction, that is, the MPEG decoding is started. After the start of the reproduction, the registration processing of the I picture is executed and the error detection is determined. If an error is detected in the determination of error detection, it is necessary to reproduce the next picture from the I picture, so the process returns to the I picture detection which is the head of the reproduction processing. If no error has been detected, and if the playback process is ongoing,
The process returns to the process of registering the I picture, and if it is determined that the reproduction has ended, the reproduction process ends.

Referring to FIG . 3, in the I picture registration processing, the registration processing is executed only when it is determined that the I picture is to be detected using the picture information determined by the MPEG decoder. The registration process is performed at the SU
BQ data, that is, control address information (1
Byte), track No. (1 byte), index No. (1 byte), each track No. Index No. for each Relative time (3 bytes) with 0 minute, 0 second, and 0 frame at the beginning of 1; ZERO data (1 byte) storing 00H;
Absolute time in minutes 0 seconds 0 frames (3 bytes), CRC
The absolute time information is read from the data composed of a total of 12 bytes of the error check data (2 bytes), and the read time is stored as the latest I-picture detection time.

[0036] Next, I picture the latest detection time and the previous I
The difference from the picture detection time is calculated, and the I picture interval is obtained from the result. Then, the contents of the memory controlled by the microcomputer 60 are checked to determine whether the I-picture interval has already been registered, and whether or not the I-picture interval has been registered. If the I-picture interval has not been registered, new registration is performed.

In this embodiment, the track No. Since the number of detections is arranged in the order of the number of detections in units, the number of detections of the registered I picture intervals is counted, and the sorting process is performed in the order of the I picture intervals based on the count value. Actual I
Since the picture intervals rarely coincide completely, information on the I picture intervals is provided in a certain range.
For example, 0.5 seconds, 2 seconds, 5 seconds, 10 seconds, 15 seconds, 2 seconds
I in units of 0 seconds, 30 seconds, 40 seconds, 50 seconds, 60 seconds, etc.
Manage picture intervals.

Referring to FIG . 4, in the I picture detection processing, the latest I picture detection time stored in the processing of FIG.
Add the time of the picture interval. If the added seek time is shorter than the error occurrence time, the reproduction has already been completed, so the value of the I picture interval is updated and the seek time is created again. For the time resulting from the addition, C
The D mechanism is sought to read data. After the data is read, it is determined that an I picture has been detected. Only when an I picture is detected, the I picture detection process ends.

In the case of the example shown in FIG . 5, the I pictures are registered in the order of 60 seconds, 30 seconds, 2 seconds, and 5 seconds because the images are sorted in descending order of the number of detections.

FIG . 6 shows an outline of the operation from the occurrence of an error to the detection of an I picture and the start of reproduction. If the I picture cannot be detected, the interval between the I pictures may be incorrect. Therefore, it is necessary to update the interval between the I pictures. In case of timeout, update the I picture interval to the next value,
The process of adding to the I picture latest detection time is repeated.

In the case shown in FIG . And I picture interval, track N
o. If an error occurs during playback of 1, the seek position is obtained by adding 0.5 seconds to the latest I-picture detection time. If no I-picture can be detected for this seek time,
Since data is added in the order of 60 seconds, 45 seconds, 2 seconds, 30 seconds, and 5 seconds, the data read position after the seek may be in the return direction.

[0042] FIGS. 8 11 illustrates another embodiment of the present invention. FIG. 8 is a flowchart showing an I picture registration process.
From step 60, step S100 is step S2 in FIG.
00 corresponds to step S240. Step S24
The difference is that the process proceeds to step S250 after 0, and the processing ends after sorting in ascending order of the I picture interval.

FIG . 9 is the same as FIG. In FIG. 9 showing an example of the interval between the track No. If an error occurs during playback of 1, the seek position is obtained by adding 0.5 seconds to the latest I-picture detection time. The time of the I pictures 1 to 5 shown in FIG. 7 is the same for the number of tracks 1 and 2 shown in FIG. 9, but the time shown in FIG. 9 and FIG. The time up to 5 is different.

FIG . 10 is a flowchart showing the reproducing process. Steps S40 and S50 of the reproducing process in FIG. 2 are the same as steps S280 and S290 in FIG. 10, but the other processes are different. In the reproduction process shown in FIG. 10, in step S260, the presence or absence of I-picture detection is detected, and the flow advances to step S270. When an I-picture is detected, reproduction is started in the CD-compatible drive normal mode. Next, the process proceeds to step S280, where it is determined whether or not an error has been detected. If there is an error, the process returns to step S260. If there is no error, the process further proceeds to step S290.
It is determined whether or not the reproduction has ended. When the reproduction is completed, the processing is ended as described above. When the reproduction is not completed, step S280 is performed.
Return to As described above, the reproduction process can be reliably performed.

FIG . 11 shows that if an I-picture cannot be detected due to the occurrence of an error, the I-picture interval may be incorrect. In the I-example, it is necessary to update the picture interval. You can make a decision.

In the above embodiment, for example,
If there is an I picture at 2 minute intervals in 0 minutes,
((60 minutes × 60 seconds) ÷ 2 seconds) × 3 bytes = 5400 bytes. In the present embodiment, when the total number of tracks of the video CD 10 is 10, and the number of I-picture intervals is 5, 10 × 5
= 50 bytes, and the memory can be reduced.

[0047]

As described in detail above, the first aspect of the present invention is as follows.
According to the above, seeking is performed at intervals of I pictures which are predicted first image data, an I picture is detected at high speed by a detecting means, and every time an I picture is detected, a difference from the previous I picture is obtained and registered. By registering the intervals of I-pictures by means, the decoder can be controlled and the video can be stored, so that the video can be detected from the storage medium at high speed.

[0048] According to claim 2, by registering in the recording units by registration means to sort the interval of the I-picture, the control of the decoder, by performing the storage of images,
Video can be detected from the storage medium at high speed, and registration in recording units can be performed smoothly.

[0049] According to claim 3, spacing of the I picture,
Sorting regardless of the order of the number of detections or the order of the seek time can reduce the time to return. For example, an error occurs immediately after I picture detection, and the I picture interval is 60 seconds. In the case of, if the CD mechanism ends in a seek time of about several hundred ms, the reproduction can be started within one second.

[0050] According to claim 4, the first interval of the I picture, by including the address information, it is possible to quickly register in the I picture interval.

[0051] According to claim 5, it seeks in the image data interval of the interval of the I-picture which is a first image data predicted, the first image data detected at high speed by the detection means, the first image Each time data is detected, the difference from the previous first image data is obtained, the interval of the first image data is registered by the registration means, and the latest detection time of the first image data is stored during normal reproduction processing. By doing so, the registration at the I picture interval can be promptly performed, and the fast forward reproduction and the fast reverse reproduction can be smoothly performed.

[0052] According to claim 6, seeks at intervals of I-picture is the first image data, the first image data detected at a high speed, the first preceding each for detecting the first image data The difference from the first image data is obtained, the interval of the first image data is registered, the latest detection time information of the first image data is stored during the normal reproduction process, and the interval of the first image data is sorted. By registering in units of recording, I-pictures can be easily detected even in a storage medium having a long I-picture interval.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing a video reproduction method of the video CD in FIG. 1;

FIG. 3 is a flowchart illustrating processing performed after registration of an I picture according to the embodiment.

FIG. 4 is a flowchart illustrating processing after detection of an I-picture according to the embodiment;

FIG. 5 is a diagram illustrating an example of image data of an I picture.

FIG. 6 is a diagram showing the start of updating when an I picture cannot be detected due to occurrence of an error.

FIG. 7 shows a track number for a video CD. FIG. 3 is a diagram showing an example of an I picture interval.

FIG. 8 is a flowchart showing an I picture registration process.

FIG. 9 shows a track number of a video CD. FIG. 3 is a diagram showing an example of an I picture interval.

FIG. 10 is a flowchart showing a reproduction process.

FIG. 11 is a diagram showing the process from the occurrence of an error to the return to the update when an I picture cannot be detected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Video CD 20 Servo controller 30 Digital signal processor 40 CD-ROM decoder 50 MPEG decoder 60 Microcomputer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-59051 (JP, A) JP-A-9-37209 (JP, A) JP-A-9-98430 (JP, A) JP-A-9-98 271025 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N ^7/ 24-7/68

Claims (6)

(57) [Claims] 1. A detecting means for seeking at an interval of an I picture which is predicted first image data and detecting an I picture at a high speed, and detecting a difference between the I picture and a previous I picture every time the I picture is detected. And a registering unit for registering the interval of the I picture. 2. The video reproducing apparatus according to claim 1, wherein the intervals of the I pictures are sorted and registered in the recording unit by the registration unit. 3. The video reproducing apparatus according to claim 1, wherein the intervals of the I pictures are sorted regardless of the order of the number of detections or the order of the seek time. 4. The video playback device according to claim 1, wherein the first interval of the I picture includes address information. 5. A detecting means for seeking at the interval of the image data at the interval 1 in the I picture which is the predicted first image data, and detecting the first image data at a high speed; Means for calculating a difference from the previous first image data each time detection is performed; registration means for registering an interval between the first image data; and latest detection of the first image data during normal reproduction processing. A video playback device, comprising: means for storing time; 6. seek at intervals of I-picture which is a first image data predicted, the first image data detected at a high speed, the last of the first on each time of detecting the first image data Taking the difference from the first image data, registering the interval of the first image data, and storing the latest detection time information of the first image data during the normal reproduction process; A video reproduction method characterized by sorting and registering in recording units.