KR100620657B1 - Digital Data Stream Transmission Method - Google Patents

Abstract

The present invention relates to a digital data stream transmission method, comprising: detecting and confirming whether data recorded at a payload of a received transmission packet is base image data capable of random access; And inserting information for identifying the base image data into a predetermined area on the header of the received transmission packet according to the verification result, wherein the data recorded in the payload of the received transmission packet is random. A transmission packet that is transmitted and received by a recording device such as a streamer by inserting and transmitting information indicating whether the base image data is accessible and information that identifies whether the transmission packet is the first packet or the last packet of the base image data. It is a very useful invention that the base video data can be searched more quickly when random access is requested, such as shift reproduction, by allowing the data to be divided into head packets of a predetermined recording unit.

Random access, stuffing byte, base image data, variable speed playback, transmission packet

Description

Method for transmitting digital data stream             

1 shows a configuration of a set-top box and a streamer,

2 shows a configuration of a general transmission packet,

3 shows a configuration of a transmission packet according to the present invention,

4 illustrates a digital data stream recording process according to the present invention,

5 shows a configuration of another transmission packet according to the present invention.

※ Explanation of code for main part of drawing

20: Tuning processing unit 21: Decoder

23,34: digital interface 24,36: memory

25, 35: control unit 31: recording medium

32: storage stream processor 33: read stream processor

100: television 200: set-top box (STB)

300 Streamer

The present invention relates to a digital data stream transmission method for partitioning a received digital data stream into a recording unit such as a Stream Object Unit (SOBU) on a disc recording medium such as a DVD (Digital Versatile Disc). .

Recently, with the development of digital technologies such as digital image compression and digital modulation and demodulation, the standardization of digital television broadcasting is rapidly progressing, and the existing terrestrial, satellite, and cable broadcasting are also known as Moving Picture Experts Group (MPEG). The digital broadcasting is able to provide a higher quality of service than the analog service according to the development of digital video / audio compression technology and digital transmission technology, and can transmit multiple broadcast programs in the same bandwidth. In addition, there is an advantage in that interoperability with digital communication media and digital storage media can be enhanced.

In such a digital broadcast, a plurality of broadcast programs encoded on the basis of an amp pack are multiplexed and transmitted in a transport stream (TS) form, and the transport stream is received by a set top box installed on the receiving side. Multiple broadcast programs included in the transport stream are demultiplexed so that only one desired broadcast program is selected, and the original audio and video signal is decoded by a decoder built into the set-top box for the selected broadcast program. The digital broadcast signal is transmitted to the A / V output device, and the digital broadcast signal is received and output to the A / V output device such as a television as well as the digital broadcast signal is stored, edited, and reproduced in a storage medium. Research is being conducted on the proposed system. The conventional digital data stream transmission and recording method will be described in detail with reference to the accompanying drawings.

First, FIG. 1 schematically shows a system to which the conventional proposed digital data stream transmission and recording method is applied. The system includes a set-top box 200 for receiving a digital broadcast signal and a digital interface such as IEEE 1394. It comprises a streamer (300) connected to be connected through the set-top box 200, the set-top box 200 receives the digital broadcast program data, that is, the transport stream is encoded and transmitted by the system encoder of the broadcasting station, By demultiplexing this, the control unit 25 of the set-top box decodes a transport stream for a broadcast program tuned by the channel processing unit 20 to the system decoder 21 according to a user's request. A broadcast program output through the A / V output device or tuned at the user's request through a digital interface (23, 34) such as IEEE 1394. It is sent to the connection connected to the streamer (300).

Meanwhile, the streamer 300 receives the transport stream transmitted from the set-top box 200 and stores the recorded stream on a disc recording medium 31 such as a DVD, and the controller 35 of the streamer is a Upon request, the broadcast program recorded on the disc recording medium 31 is read out and transmitted to the set top box 200 connected through a digital interface 23 or 34 such as IEEE 1394.

Accordingly, the set-top box 200 decodes the broadcast program transmitted from the streamer 300 to the decoder 21 and outputs it to the connected television 100, thereby disc recording medium 31 such as DVD. The broadcast program recorded in the above is reproduced and output through the video screen of the television.

As described above, when the control unit 35 of the streamer 300 receives the data stream transmitted from the set-top box 200, the control unit 35 stores the received data stream on the recording medium 31 for recording and storing the received data stream. The stream processing unit 32 controls the transport stream. The transport stream recorded and stored by the storage stream processing unit 32 has a recording unit having a predetermined size, for example, a size of 188 bytes. The 188-byte transport packet includes a sync byte and a transmission error indication information in addition to the payload which is video or audio data. Header information including a continuity counter and an adaptation field, wherein the payload data includes base image data. Random Access Indicator (RAI) indicating whether data is randomly accessible, such as (I-Picture), and stuffing bytes additionally recorded to match the transmission packet to a recording size of 188 bytes. Bytes) are recorded.

Meanwhile, the data stream recorded and stored on the recording medium 31 by the storage stream processor 32 of the streamer 300 may be a recording object unit (SOBU: Stream Object Unit) having a predetermined size, for example, 188. 32 unit sectors composed of byte transmission packets are partitioned and recorded into one recording unit, and the recording unit partitioned as described above is the base image data which can be randomly accessed for shift reproduction which is requested by the user. It is preferable to divide and record the transmission packet corresponding to the first packet of the recording unit.

Accordingly, in order to record the transmission packet corresponding to the base image data that can be randomly accessed as the first packet of the recording unit as described above, random access indication information (RAI) included in the adaptation field of the header information is detected and It has been proposed to check whether the data recorded in the load is the base image data, and if the checked payload data is the base image data, segmentally recording the corresponding transmission packet into the first packet of the recording unit.

However, the random access instruction information is instruction information for indicating that the data recorded on the payload is data that can be randomly accessed. From the random access instruction information, the data recorded on the payload is the base image data, that is, random access. There is a problem that it is not possible to identify whether the video data is capable of video data or audio data capable of random access.

Accordingly, the present invention was created to solve the above problems, and additionally records and transmits information in the transmission packet to identify whether the data recorded in the payload of the transmission packet is the base image data that can be randomly accessed. Accordingly, an object of the present invention is to provide a digital data stream transmission method that enables recording of a digital data stream received from a recording device such as a streamer suitably for shift reproduction.

According to an aspect of the present invention, there is provided a digital data stream transmission method comprising: detecting and confirming whether data recorded at a payload of a received transmission packet is base image data capable of random access; And inserting information for identifying the base image data into a predetermined area on the header of the received transmission packet according to the verification result.

Hereinafter, a digital data stream transmission method according to the present invention will be described in detail with reference to the accompanying drawings.

First, the digital data stream transmission method according to the present invention is performed in a system configured as described above with reference to FIG. 1. The control unit 35 of the streamer 300 included in the system includes a set-top box. When receiving the data stream transmitted from the 200, the storage stream processor 32 is controlled to record and store the received data stream on the recording medium 31. The storage stream processor 32 As shown in FIG. 3, the transport stream recorded and stored by () is transmitted in a transmission unit having a predetermined size, for example, a size of 188 bytes, and the video is included in the 188 byte transmission packet. Or header information including a sync byte, transmission error indication information, a continuous counter, and an adaptation field, in addition to the pay load, which is audio data. In the adaptation field, random access indication information as described above with reference to FIG. 2 and stuffing bytes which are additionally recorded to match the transmission packet with a recording size of 188 bytes are recorded. The first byte of the stuffing bytes is recorded. Identification information (I-Picture) for identifying whether the data recorded in the payload of the transmission packet is the base image data that can be randomly accessed during the shift playback, and the first transmission of the transmission packet corresponding to the base image data. The start information (I_Start) and the end information (I_End) are recorded to be able to identify whether the packet is the packet or the last transmission packet.

Meanwhile, in the adaptation field length recorded in the adaptation field of the header information, the corresponding data length value is considered in consideration of the data length of the first stuffing byte in which the identification information and the start / end information are recorded. Will be recorded.

Accordingly, the storage stream processing unit 32 of the streamer 300 detects and confirms the identification information recorded in the header information of the received transmission packet, and the data recorded in the payload of the transmission packet is the base image data. In the case of the base image data, the start information is detected and checked to determine whether the transmission packet is the first packet of the base image data.

That is, when the first bit value, that is, the identification information recorded in the first stuffing byte, is 'b0 = 1', it is determined that the data recorded in the payload of the transmission packet is the base image data, and also the second bit. If the value of 'b1 = 1' is determined that the transmission packet is the first packet of the base image data, and if the value of the third bit is 'b2 = 1', the transmission packet is the last of the base image data The packet can be identified and checked.

Therefore, the identification information, the start information, and the end information of the first stuffing byte recorded in the header information of the received transmission packet are detected and checked, and as shown in FIG. 4, the transmission packet corresponding to the base image data is recorded in the recording unit. It is possible to divide and record by the first packet of, so that it is possible to search for the base video data which can be randomly accessed during shift reproduction.

On the other hand, Figure 5 shows the type of data recorded in the payload of the transmission packet, and information for identifying the start or end of the data corresponding to the type of the packet described above with reference to Figure 3 In the first stuffing byte of the header information, two bits of type information (Picture_Type) indicating the type of data recorded in the payload of the transmission packet, and start information (identifying whether the transmission packet is the first packet corresponding to that type) Picture_Start) and end information (Picture_End) for identifying whether a transport packet is the last packet of the type may be recorded.

That is, as shown in FIG. 5 according to the values b0 b1 of the first and second bits, which are data type information recorded in the first stuffing byte, the data recorded in the payload of the transmission packet is based on the base image data. (b0 b1 = '01'), the predicted image data (b0 b1 = '10'), or the bidirectional predicted image data (b0 b1 = '11') is confirmed and determined, and the values of the third and fourth bits (b2) b3), it is possible to check and determine whether the transmission packet is the first packet (b2 b3 = '01') or the last packet (b2 b3 = '10') of the data of the corresponding type, and not only the base image data. In addition, it is possible to partition and record the transmission packet of data corresponding to any type into the first packet of the recording unit, so that when the random access is requested, the data of the corresponding type can be searched more quickly.

The digital data stream transmission method according to the present invention includes the information indicating whether the data recorded in the payload of the received transmission packet is the base image data that can be randomly accessed, and the transmission packet is the head of the base image data. By inserting and transmitting information for identifying whether a packet is the last packet or the like, and in a recording device such as a streamer, the transmission packet received can be partitioned and recorded as the first packet of a predetermined recording unit. When random access is requested, it is a very useful invention that can search the base image data more quickly.

Claims (3)

Detecting and confirming whether the data recorded in the payload of the received transmission packet is base image data capable of random access; And And inserting information for identifying the base image data into a predetermined area on the header of the received transmission packet according to the verification result. The method of claim 1, And the identification information is recorded in a specific recording area of header information which is additionally recorded in order to match the transmission packet to a recording unit of a predetermined size. The method of claim 2, And the identification information is recorded in a specific recording area of the header information together with information indicating the start or end of the base image data.

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