KR20120001475A - Multi-channel record and playback apparatus for improving record and playback velocity - Google Patents

Abstract

PURPOSE: A multi-channel recording apparatus is provided to increase the reproduction speed of a multi-channel recording apparatus and to increase the size of data load. CONSTITUTION: A reading cache unit(110) stores loaded image data. A reproduction control unit(120) loads image data from a specific channel location to the last location of a corresponding reading cache block. The reproduction control unit records image data to the reading cache unit. Reading cache blocks, which are allocated to the stored multi channel image file of a hard disk, request the reading of the specific channel location.

Description

Multi-channel record and playback apparatus for improving record and playback velocity

TECHNICAL FIELD The present invention relates to video recording and reproducing technology, and more particularly, to a multi-channel recording / reproducing apparatus for improving recording and playback speed.

File Cache technology improves performance by dividing a file into blocks of a certain size, allocating a cache, and reading or writing data in blocks to reduce the number of accesses to the actual hard disk.

However, when only some channels are searched for playback in a multi-channel recording / playback system such as a DVR, video data of unnecessary other channels is loaded into a cache, thereby slowing down the search speed.

For example, assuming that channel 1 image data is retrieved from a file in which multi-channel image data from channels 1 to 4 are sequentially recorded, as shown in FIG. 1, in order to load channel 1 image data as shown in FIG. You must load everything. In other words, the larger the size of the cache block, the larger the unnecessary load size.

If the size of the cache block is reduced as shown in FIG. 2 to reduce the unnecessary load size, the number of hard disk seeks is required because the cache blocks 1, 4, 5, 7, and 8 must be searched to load channel 1 image data. Increases.

Therefore, the larger the cache size, the larger the unnecessary load size, and the smaller the cache size, the less the unnecessary load but the higher the number of hard disk seeks.

Accordingly, the present inventors have studied a multi-channel recording / playback technology capable of improving recording and playback speed by reducing data load size and hard disk seek times as much as possible.

The present invention has been invented under the above-described object, and an object thereof is to provide a multi-channel recording / playback apparatus capable of improving recording and playback speed by reducing data load size and hard disk seek count as much as possible. .

According to an aspect of the present invention for achieving the above object, a specific channel that is requested to read from the read cache blocks allocated to the multi-channel image file stored in the hard disk, the multi-channel recording / playback apparatus for improving the recording and playback speed Only the image data from the position to the last position of the read cache block is loaded and recorded in the read cache unit.

According to an additional aspect of the present invention, the multi-channel recording / reproducing apparatus for improving the recording and reproducing speed allocates the size of the write cache to be larger than the size of the read cache.

According to an additional aspect of the present invention, a multichannel recording / reproducing apparatus for recording and reproducing speed is hardened only from the modified initial position data to the modified last position data among the multichannel image data temporarily stored in the write cache unit. It is characterized by recording on a disc.

The present invention loads only the image data from the specific channel position of the read request to the last position of the read cache block among the data in the read cache block allocated to the multi-channel image file, and the remaining image data in front of the specific channel position of the read request is The data load size can be reduced by loading on demand or in spare, which has a useful effect of improving the playback speed of a multi-channel recording / reproducing apparatus.

In addition, the present invention can allocate the size of the write cache portion larger than the size of the read cache portion to reduce the unnecessary data load size and the number of hard disk seek (Seek), so that the recording and playback speed of the multi-channel recording / playback device Has a useful effect to improve.

In addition, the present invention reduces the flush load of the multi-channel recording / playback apparatus by recording only the data from the modified initial position data to the modified last position data among the multi-channel image data temporarily stored in the write cache unit on the hard disk. It has a useful effect to improve the recording speed.

FIG. 1 is a diagram illustrating an example in which a size of a cache block allocated to a file in which multichannel image data is sequentially recorded is large.
FIG. 2 is a diagram illustrating an example in which a cache block size allocated to a file in which multichannel image data is sequentially recorded is small.
3 is a block diagram showing the configuration of an embodiment of a multi-channel recording / reproducing apparatus for improving the recording and playback speed according to the present invention.
4 is a diagram illustrating an example of data loaded from a read cache block allocated to multi-channel image data.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the embodiments of the present invention may unnecessarily obscure the gist of the present invention.

The terms used throughout the present specification are terms defined in consideration of functions in the embodiments of the present invention, and may be sufficiently modified according to the intention, custom, etc. of the user or operator, and the definitions of these terms are used throughout the specification. It should be made based on the contents.

3 is a block diagram showing the configuration of an embodiment of a multi-channel recording / reproducing apparatus for improving the recording and playback speed according to the present invention. As shown in the figure, the multi-channel recording / reproducing apparatus 100 for improving the recording and playback speed according to the present invention comprises a read cache unit 110 and the reproduction control unit 120.

The read cache unit 110 temporarily stores the loaded image data. The playback control unit 120 loads only the image data from a specific channel position read from the read cache blocks allocated to the multi-channel image file stored in the hard disk to the last position of the read cache block. ).

When the multi-channel image file is stored in the hard disk, each channel image is sequentially stored for each channel index, and the playback controller 120 reads the corresponding data from the read request position with reference to the hard disk physical position matched with each channel index. Only image data up to the last position of the cache block can be loaded.

For example, assuming that channel 1 image data is retrieved from a file in which multi-channel image data from channels 1 to 4 are sequentially recorded, the multi-channel image data is divided into cache block units, and the size of the read cache unit is set to the cache block unit. Suppose it is the same size.

As shown in FIG. 4, in order to load the channel 1 image data, the playback controller 120 starts the cache block 1 from the first position of the cache block 1, which is the position of the channel 1 image data that is requested to be read from the cache block 1. All the image data up to the position is loaded and recorded in the corresponding position of the read cache unit 110.

Then, the playback controller 120 loads only the image data from the back of the cache block 2, which is the position of the channel 1 video data that is requested to be read from the cache block 2, to the last position of the corresponding cache block 2, and reads the read cache unit ( Record in the appropriate location of 110).

Meanwhile, the read control unit 120 loads all the image data from the cache block 3 from the first position of the cache block 3, which is the position of the channel 1 image data, to the last position of the cache block 3. Record at that location.

On the other hand, the reproduction control unit 120 loads only the image data from the cache block 4 to the last position of the cache block 4 slightly from the middle portion of the cache block 4, which is the position of the channel 1 image data, and the read cache unit 110 ) To the appropriate position. The read cache unit 110 may be initialized every time channel 1 image data in each cache block is loaded.

That is, in the conventional file cache technology, a multi-channel video file is divided into blocks of a predetermined size, the cache is allocated, and all the video data are read in blocks and temporarily stored in the cache. In the case of the multi-channel recording / reproducing apparatus 100 for improvement, the playback controller 120 starts from a specific channel position where a read request is requested from read cache blocks allocated to a multi-channel image file stored in a hard disk, and ends the corresponding position of the read cache block. Only image data up to is loaded and temporarily stored in the read cache unit 110.

Then, the reproduction control unit 120 loads the remaining image data in front of the specific channel position that is requested to be read from the read cache blocks allocated to the multi-channel image file when needed or in spare and stores it in the read cache unit 110.

Therefore, the invention according to this embodiment loads only the image data from the specific channel position of the read request to the last position of the read cache block among the data in the read cache block allocated to the multi-channel image file, and the specific channel position of the read request. The remaining image data of the first part can be loaded when needed or when spare, thereby reducing the data load size, thereby improving the playback speed of the multi-channel recording / reproducing apparatus.

On the other hand, according to an additional aspect of the present invention, the multi-channel recording / reproducing apparatus 100 for improving the recording and playback speed further includes a write cache unit 130 and the recording control unit 140.

The write cache unit 130 temporarily stores multi-channel image data. For example, the multi-channel recording / reproducing apparatus 100 may receive each channel image photographed by a plurality of network cameras from the network and temporarily store the multi-channel image data received from the network in the write cache unit 130, or Each channel image photographed by the analog camera may be temporarily stored in the write cache unit 130.

The recording controller 140 records the multi-channel image data temporarily stored in the write cache unit 130 on the hard disk. The recording controller 140 should periodically flush all data in the write cache unit 130 that is currently being recorded to the hard disk in order to minimize an image lost in an event such as a power failure during recording.

At this time, in this embodiment, the recording controller 140 controls to record only the data from the modified initial position data to the modified last position data among the multi-channel image data temporarily stored in the write cache unit 130 to the hard disk. By reducing the flush load of the multichannel recording / playback device, the recording speed can be improved.

On the other hand, according to an additional aspect of the present invention, the multi-channel recording / reproducing apparatus 100 for improving the recording and playback speed than the allocation size of the read cache unit 130 than the allocation size of the read cache unit 110 It can be implemented to be larger.

The smaller the size of the read cache unit 110 is, the smaller the size of the image data that is unnecessarily loaded, and the recording call for recording is made by making the allocation size of the write cache unit 130 larger than the read cache unit 110. Reduce the number of times

That is, in this embodiment, when the allocation size of the write cache unit 130 is larger than the allocation size of the read cache unit 110, unnecessary data load size and the number of hard disk seeks may be reduced. It is possible to improve the recording and playback speed of the channel recording / playback apparatus.

Accordingly, by the above, the present invention can reduce the data load size and the number of hard disk seek times as much as possible during recording and playback of the multi-channel recording / playback apparatus, thereby improving the recording and playback speed. The object of the present invention presented above can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

The present invention is industrially applicable in the field of video recording and playback and its application.

100: multi-channel recording / playback device 110: read cache unit
120: playback control section 130: write cache section
140: recording control unit

Claims (5)

A read cache unit for temporarily storing the loaded image data;
A playback control unit which loads only the image data from a specific channel position requested for reading from the read cache blocks allocated to the multi-channel image file stored in the hard disk to the last position of the corresponding read cache block and records the read data in the read cache unit;
Multi-channel recording / playback apparatus for improving the recording and playback speed, characterized in that it comprises a. The method of claim 1,
The playback control unit:
And recording the remaining image data in front of a specific channel position that is requested to be read, if necessary or at a time, and recording the read data in the read cache unit. The method according to claim 1 or 2,
The multi-channel recording / playback device for improving the recording and playback speed is:
A write cache unit for temporarily storing multi-channel image data;
A recording controller for recording and recording multi-channel image data temporarily stored in the write cache unit on a hard disk;
Multi-channel recording / playback apparatus for improving the recording and playback speed further comprising. The method of claim 3, wherein
And the allocation size of the write cache unit is larger than the allocation size of the read cache unit. The method of claim 4, wherein
The recording control unit:
Multi-channel recording / playback for improving the recording and playback speed, characterized in that the control to record only the data from the modified initial position data to the modified last position data of the multi-channel image data temporarily stored in the write cache unit to the hard disk Device.

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