KR20020072108A - A system for storing and displaying a digital mpeg data and a method for storing and displaying a digital mpeg data - Google Patents

Abstract

PURPOSE: A system and a method for storing digital MPEG data in storage media and reproducing the MPEG data are provided to add additional header information to the received MPEG data and store the data in storage media. CONSTITUTION: A system for storing digital MPEG data in storage media and reproducing the MPEG data includes a demultiplexer(101), a decoder, a start code searching unit(103), a storage block header generator(104), and a data storage(107). The demultiplexer demultiplexes video data and audio data based on header information of digital MPEG data. The decoder decodes the demultiplexed digital MPEG data. The start code searching unit searches the video data for a video data code. The storage block header generator adds the information searched by the start code searching unit and information required for a storage block. The data storage stores the MPEG data stream generated by the storage block header generator.

Description

A system for storing and playing digital MPEG data on a storage medium and a method therefor {A SYSTEM FOR STORING AND DISPLAYING A DIGITAL MPEG DATA AND A METHOD FOR STORING AND DISPLAYING A DIGITAL MPEG DATA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital data storage and reproducing, and in particular, additional information is added to digital MPEG data received in a set-top box, stored in a storage medium, and then read from the storage medium during playback. The present invention relates to a system and method for storing and reproducing digital MPEG data capable of performing image reproduction.

In general, multimedia refers to the handling of a plurality of expression media collectively by the same delivery media. The core element technologies of such multimedia are compression and decompression of information, multiplexing and demultiplexing of video and audio data, and object technology.

In the compression of information, MPEG (Moving Picture Experts Group) generally refers to a group of video experts who set up standards for digital video and digital audio compression. It also refers to information compression technology. At the same time as the compression of information, the technique of decompressing compressed information is also an important part of multimedia.

In addition to the compression of this information, the storage medium of the compressed information is also expected to play an important part. Recently, the most interesting digital information storage medium is a hard disk driver (HDD) capable of large capacity and random access, and various types of storage media are expected to emerge in the future.

FIG. 1A is a diagram showing the structure of a conventional video and audio data block and block, and FIG. 1B is a diagram showing a video and audio data block header structure.

As shown in FIG. 1A, MPEG data received by a receiver (not shown) is divided into video and audio data by a demultiplexer, and each data is a byte number (K) of a size suitable for storage on a storage medium. , L). These are called video storage blocks and audio storage blocks, respectively. In addition, additional information necessary for processing each block, that is, a block header is added and packetized, arranged in an appropriate order (usually a video packet and a plurality of audio packets), and then stored in an information storage medium ( Packet header + packet data).

The accompanying Figure 1B shows the contents of the video and audio storage block header as an example. The header includes a header length indicating the number of bytes of the storage block header, a header block type indicating whether the block data is video or audio, and an ES length indicating the number of bytes of the block data. STC, which is the video and audio STC (system timing clock) time information of the current block data, real time indicating the data recording time in seconds in the current hard disk drive, and The previous storage block point representing the recording position information, the current storage block point representing the recording position information of the current storage block, the next storage block point representing the recording position information of the next storage block, and the number of consecutive storage blocks of each of video and audio. Contains the continuity count.

In particular, a hard disk driver is used as various means of communication or means for storing compressed MPEG data from a digital VCR or a personal computer. Such reproduction of MPEG data requires various reproduction control.

However, conventionally, when reproducing packetized MPEG data stored in an information storage medium such as a hard disk driver, it is difficult to reproduce MPEG data using various functions.

In order to solve such a problem, the technical problem to be achieved by the present invention is to enable the playback of MPEG data stored in the storage media using a variety of functions.

FIG. 1A is a diagram showing the structure of a conventional video and audio data block and block, and FIG. 1B is a diagram showing a video and audio data block header structure.

2A and 2B are block diagrams illustrating a system for storing and reproducing digital MPEG data according to an exemplary embodiment of the present invention.

3A and 3B illustrate an example in which MPEG header start data and MPEG header start data are applied to a video packet according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating a method of storing and reproducing MPEG data according to an exemplary embodiment of the present invention.

A system for storing and reproducing digital MPEG data in a storage medium according to an aspect of the present invention for achieving the above object,

A demultiplexer for demultiplexing video and audio data based on header information of digital MPEG data received through at least one communication means, and a data having a decoder for receiving and decoding demultiplexed digital MPEG data from the demultiplexer As a storage system,

A start code searcher for searching for video data codes by searching video data among the video and audio data separated by the decoder;

A storage block header generation unit for adding information searched by the start code search unit and information necessary for a storage block; And

Data storage unit for storing the MPEG data stream generated by the storage block header generator

It includes.

According to another aspect of the present invention, a method of storing digital MPEG data in a storage medium includes:

A data storage method using a system for storing digital MPEG data received through at least one communication means in a data storage means,

Separating and decoding the video and audio data separately based on the header information of the MPEG data received through the communication means;

Automatically generating block header information capable of playing the MPEG data in at least one reproduction mode and adding the header information of the received MPEG data;

Storing an MPEG data stream to which the block header information is added, in the data storage means;

It includes.

According to another aspect of the present invention, a method for reproducing digital MPEG data includes

A data reproducing method for separating digital MPEG data received through at least one communication means, decoding the decoding data in a decoding means and storing the same in the data storage means, and reading the stored MPEG data from the data storage means and reproducing it through the reproducing means.

Automatically generating block header information capable of playing the MPEG data in at least one reproduction mode and adding the header information of the decoded MPEG data;

Storing an MPEG data stream to which the block header information is added, in the data storage means; And

In response to an MPEG data reproduction request, reading an MPEG data packet stream to which the block header information stored in the data storage means is added and reproducing the MPEG data packet stream in the reproduction mode through the reproduction means;

It includes.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B are block diagrams illustrating a system for storing and reproducing digital MPEG data according to an exemplary embodiment of the present invention.

A system for storing and reproducing digital MPEG data according to an embodiment of the present invention may be received from one or more communication means (satellite, cable, LAN, etc.) or from a digital video recorder (VCR) or a personal computer (PC). A set-top box 100 that mixes and stores additional header information in the stored MPEG data and enables navigation operations on the stored data; It includes a playback unit 200 for displaying audio and video data by the navigation operation control performed in the set-top box 100.

The above-mentioned navigation (or navigator) refers to a concept of allowing the user to move the playback time of the MPEG data being reproduced as intended.

As shown in FIG. 2A, a system for storing digital MPEG data according to an exemplary embodiment of the present invention includes a demultiplexer for demultiplexing MPEG data received from one or more communication means (satellite, cable, LAN, etc.). Demux (101); video storage block generation unit 102 for configuring the image data of the de-multiplexed MPEG data into individual bit strings of storage blocks; receiving the generated video storage block sequence sequence code and each picture ( A start code search unit 103 for searching for a start code of I, B, and P; a video storage block header generator 104 for adding searched start code information and information required for a storage block; among demultiplexed MPEG data An audio storage block generation unit 105 configured to configure speech data into individual bit strings in units of storage blocks; Block header generation unit 106: MPEG data storage unit 107 for mixing and storing the header data generated by the video storage block header generation unit 104 and the header data generated by the audio storage block header generation unit 106 Include.

The MPEG data storage unit 107 is a hard disk driver for storing digital data, and may be a recording medium capable of recording information on a digital data storage medium (CD, DVD, etc.) other than the hard disk driver. The present invention is not limited only to the examples.

As shown in FIG. 2B, a system for reproducing MPEG data according to an exemplary embodiment of the present invention receives one or more playback mode control signals selected by a user and controls playback to read video storage block data according to the corresponding playback mode. A mode processor 108; Receives a video storage block data read control signal according to a reproduction mode selection from the reproduction mode processing unit 108, searches for block header information of the MPEG data stored in the MPEG data storage unit 107, and decodes the video and audio data. A block header search unit 109 for generating a control signal; A storage data header processing unit (110) which receives the block header information retrieved from the block header searching unit (109), and reads and processes the header information of the video and audio MPEG data according to the block header information for reproduction of the MPEG data; An MPEG video decoder 111 for decoding the video MPEG data processed by the stored data header processor 110; An MPEG audio decoder 112 for decoding the audio MPEG data processed by the storage data header processor 110 is included.

The playback unit 200 is a television displaying received MPEG data, and may be a monitor of a computer or a display device of a terminal capable of playing MPEG data. The present invention is not limited to the embodiment.

Hereinafter, with reference to the accompanying drawings, the operation of the digital MPEG data reproduction system according to an embodiment of the present invention will be described in detail.

3A to 3C are diagrams showing examples of applying MPEG header start data and MPEG header start data to a video packet according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating a method of reproducing MPEG data according to an embodiment of the present invention. It is a flowchart.

When the user wants to record received MPEG data using the set-top box 100, the set-top box 100 receives compressed audio and video data from various communication means or a digital VCR or a personal computer (S100). .

Demux 101 demultiplexes MPEG data received from a communication means such as satellite, cable, LAN, etc. and separates them into individual bit streams (S110), and then the video data is stored in the video storage block generator 102. The data is transmitted to the audio storage block generator 105. The video storage block generator 102 configures the video data among the demultiplexed MPEG data into individual bit strings in units of storage blocks and transfers the video data to the start code searcher 103. The start code search unit 103 receives the generated video storage block to search the sequence start code and the start code of each picture (I, B, P).

After the start code search is completed, the start code search unit 103 transmits the code search result to the video storage block header generation unit 104, and the video storage block header generation unit 104 searches for the searched start code information and the storage block. Add necessary information to (S120).

As shown in FIG. 3A, the header start data includes an MPEG header start point N in the packet data, an MPEG header type indicating the division of the MPEG header present in the packet data, and an MPEG header start point in the packet data. It contains the start point to display. The MPEG header type refers to distinguishing a sequence header of MPEG data, a group of picture (GOP) header, an I picture start, a B picture start, and a P picture start.

In the reproduction of data from the MPEG data storage unit 107 such as a hard disk driver, there are various types of playback functions such as a trick mode such as fast forward, rewind, midway playback, and reverse playback. To implement this trick mode, an I picture is used to play MPEG data. It is impossible for a B picture or a P picture to make a proper picture based on its own data. This is because a B picture or a P picture always needs a reference frame. However, the I picture is made of a complete picture only by its own data. In addition, all video decoders support an I picture decoding mode, and thus, I pictures enable playback modes of various speeds. Therefore, by adding picture start code, sequence start code, and GOP start code information to each storage block, the location of each picture can be accurately known only by the storage block header information during playback. It is possible to move.

In the video packet data (n) decoded by the MPEG data decoder 120, the received MPEG data header is a sequence header, the start point of the sequence header in the packet is a, and the start point of the I picture is b. In this case, as shown in FIG. 3B, the video storage block header generation unit 104 generates header start data including N: 2, MPEG header type: sequence header, and start point: a. In addition, when the start point of the MPEG picture type B picture is c in the next decoded video packet data n + 1, header start data including N: 1 and B picture start point: c are generated. The generated video storage block header is added to the conventional packet header data and stored in the MPEG data storage unit 107 (S130).

In the case of audio data, the audio storage block generator 105 configures audio data into individual bit strings in units of storage blocks among demultiplexed MPEG data received from the Demux 101, and generates an audio storage block header generator ( 106 adds information required for the storage block to the audio data storage block.

When the user selects a navigation operation through a remote controller (not shown) while playing recorded MPEG data (S140), the playback mode processing unit 108 detects a playback mode control signal and generates the video storage block header generation unit 104. A navigation operation is performed on the data stored in the MPEG data storage unit 107 based on the received header (S150). In this case, the user may select the navigation through the navigation operation selection means installed in the set-top box, the present invention is not limited to the embodiment.

First, when normal play (S151) playback is selected by the user, the play mode processing unit 108 receives a play mode control signal to read the video storage block data according to the play mode. 108).

The block header search unit 109 receives a video storage block data read control signal according to a play mode selection from the play mode processor 108, searches for block header information of the MPEG data stored in the MPEG data storage unit 107, Generates control signals for decoding video and audio data. The stored data header processing unit 110 receives the block header information retrieved from the block header searching unit 109 and reads header information of the video and audio MPEG data according to the block header information for reproduction of the MPEG data. After receiving the decoding control signal from the block header search unit 109, the MPEG video decoder 111 decodes the video MPEG data processed by the storage data header processing unit 110 according to a reproduction mode. At this time, the MPEG video decoder 111 receives a bit stream from the MPEG data storage unit 107 according to a normal operation speed and reproduces the bit stream in the playback unit 200, and reproduces the data without using header start data.

When Normal fast forward and Slow fastforward (S132) is selected, the MPEG video decoder 111 typically performs normal fast forward (I picture decoding) and slow operation. In this case, the bit data may be supplied from the MPEG data storage unit 107 according to the speed of the MPEG video decoder 111, and block header start information is not required. At this time, the MPEG data storage unit 107 receives and reproduces the bit stream in accordance with the speed of the MPEG video decoder 111 as in the normal play reproduction. Also, header start information is not required.

In the case of Variable speed fast forward (S153) reproduction, the block header search unit 109 jumps by a certain amount depending on the fast forward speed at the current data recording position of the MPEG data storage unit 107, or the header After skipping and jumping by the number of I picture frames to be skipped using the start data, the MPEG video decoder 111 only the packet including the I picture start in the closest storage block header to the packet having the header start data of the next picture. Feeds the bit stream. The MPEG video decoder 111 repeats the above operation while decoding in the I picture only decode mode.

In the case of very fast backward (S154) reproduction, the block header search unit 109 makes the jump in the backward direction or the I picture search in the backward direction at the data recording position of the MPEG data storage unit 107. There is a difference and it behaves much like fast forward playback.

In case of frame by frame reverse (S155) playback, the block header search unit 109 finds a packet in which the I picture in the backward direction closest to the current frame is located between playback of the currently playing picture. Then, the bit stream is supplied to the MPEG video decoder 111 from the packet to the advanced position of the frame currently being reproduced to perform normal decoding. When decoding is completed by the MPEG video decoder 111 until the frame, the MPEG video decoder 111 copies the data to a reproduction memory (not shown) and repeats the above operation while data is reproduced.

In the case of random access picture coding (S156) reproduction, when the user designates an arbitrary position in the recorded video, the block header search unit 109 supplies a bit stream from the packet in which the I picture start exists from that position to decode normal play ( Decode normal play).

When the editing function S157 is selected, video data packets existing at several different positions can be precisely known from the MPEG header start data so that the position where the I picture starts can be edited.

The MPEG video decoder 111 reproduces the MPEG data in the playback unit 200 in accordance with the respective functions described above (S160). When reading the block header information by selecting the various reproduction modes described above, the block header search unit 109 transmits a mute control signal to the MPEG audio decoder 112 so that the audio data is not reproduced.

The embodiment of the present invention is only one embodiment, and many modifications and variations of the components are possible without departing from the gist of the present invention, and the present invention is not limited to the embodiments.

As described above, the digital MPEG data storing / reproducing system and method thereof according to the present invention may add and store additional header information to received MPEG data to perform a navigation operation, and the additional header information stored in the storage medium may be added. The MPEG data can be reproduced using various functions.

Claims (12)

A demultiplexer for demultiplexing video and audio data based on header information of digital MPEG data received through at least one communication means, and a data having a decoder for receiving and decoding demultiplexed digital MPEG data from the demultiplexer In the storage system, A start code searcher for searching for video data codes by searching video data among the video and audio data separated by the decoder; A storage block header generation unit for adding information searched by the start code search unit and information necessary for a storage block; And Data storage unit for storing the MPEG data stream generated by the storage block header generator System for storing and playing digital MPEG data in a storage medium comprising a. In claim 1, And a reproduction mode control unit for receiving a user's request for playing MPEG data, reading the MPEG data stream stored in the data storage unit, and controlling the reproduction of the MPEG data stream in one or more reproduction modes through a display means. System to save and play on. The method of claim 1, wherein the block header information is And the MPEG header start point information in the packet stream, wherein the MPEG header type indicates a start number of an MPEG header in the MPEG data packet stream, an MPEG header type indicating a division of an MPEG header existing in the packet stream. In the data storage method using a system for storing the digital MPEG data received through at least one communication means in the data storage means, Separating and decoding the video and audio data separately based on the header information of the MPEG data received through the communication means; Automatically generating block header information capable of playing the MPEG data in at least one reproduction mode and adding the header information of the received MPEG data; Storing an MPEG data stream to which the block header information is added, in the data storage means; Digital MPEG data storage method comprising a. The method of claim 4, wherein the block header information is And the MPEG header start point information in the packet stream, wherein the MPEG header type indicates a start number for an MPEG header in the MPEG data packet stream, an MPEG header type indicating a division of an MPEG header existing in the packet stream. In a data reproducing method, the digital MPEG data received through at least one communication means is separated and decoded by the decoding means, stored in the data storage means, and the stored MPEG data is read from the data storage means and reproduced by the reproducing means. Automatically generating block header information capable of playing the MPEG data in at least one reproduction mode and adding the header information of the decoded MPEG data; Storing an MPEG data stream to which the block header information is added, in the data storage means; And In response to an MPEG data reproduction request, reading an MPEG data packet stream to which the block header information stored in the data storage means is added and reproducing the MPEG data packet stream in the reproduction mode through the reproduction means; Digital MPEG data playback method comprising a. 7. The method of claim 6, wherein said storing step Digital start data including adding start number information of an MPEG header in the MPEG data packet stream, MPEG header type information indicating a classification of an MPEG header present in the packet stream, and MPEG header start point information in the packet stream. How to play. The method of claim 6, wherein the reproducing step A packet including the nearest I picture start after moving by a certain amount according to the fast forward speed at the current data recording position of the data storage means or by skipping by the number of I picture frames to skip using the block header information. Digital MPEG data comprising a very fast forward reproducing step of supplying a bit stream to the data decoding means only up to a packet having header start data of a next picture, and reproducing while decoding the data decoding means in a mode for decoding only an I picture. How to play. The method of claim 6, wherein the reproducing step And a very fast backward playback step of moving forward from the data recording position of the data storage means in the backward direction or replaying the I picture search in the backward direction very quickly in the same manner as forward forward playback. The method of claim 6, wherein the reproducing step Finds the packet in which the I picture in the backward direction closest to the current frame is located between playback of the currently playing picture, and then supplies the bit stream to the data decoding means from the packet to the advanced position of the currently playing frame. Digital decoding data including a frame switching and reproducing step of performing general decoding, copying to the data storage means when decoding is completed by the data decoding means to the frame, and repeating the above operation while data is reproduced. How to play. The method of claim 6, wherein the reproducing step When a specific position of the stored MPEG data is designated by the user, a bit stream is supplied to the data decoding means from the specific position to the packet with the next picture start code from the specific position, and the data decoding means is executed. And a random access picture coding reproduction step of decoding in a mode for decoding only an I picture. The method of claim 6, wherein the reproducing step Reproducing digital MPEG data including an editing step of enabling editing of an image according to the position at which the I picture starts when the position at which the I picture starts is accurately determined using the block header information of the video data packet existing at another position. Way.