KR20000026049A - Method and apparatus for converting digital data stream format - Google Patents

Abstract

PURPOSE: An apparatus for converting a digital data stream format is provided to eliminate an inconvenience of controlling an optical disk apparatus in order to control the navigation operation of the optical disk apparatus. CONSTITUTION: In an apparatus for converting a digital data stream format, a partition part(56) divides and extracts a program stream and first navigation data which are incorporated in the digital data stream. An interpreter(88) interprets the extracted program stream to divide and interpret the program stream into second navigation data for system clock data, presentation data and a program reproduce control. An analyzer subdivides the divided and interpreted presentation data into each constituent data, and a timing controller generator(90) produces a reference time for a data packet transfer based on the system clock data. A PSI & CRC generator(86) converts the first and the second navigation data into additional data added into the data packet, and TS packizer & MUX(87) combines each constituent data and the additional data, and constructs the combined result into a data stream of a predetermined format based on the reference time.

Description

Digital data stream format conversion apparatus and method

In the apparatus and method for digital data stream format conversion, the format of the digital data stream is transmitted when transmitting or receiving a digital data stream (MPEG) using an IEEE 1394 interface. An apparatus and method for converting a digital data stream format into a digital data stream of a predetermined format are provided.

In recent years, the standardization of optical discs, especially DVDs (Digital Versatile Discs or Digital Video Discs, or DVDs), has been rapidly carried out among related companies, and it is expected that the spread of DVDs will be widely spread in the future. Digital video display device capable of video display of, for example, digital satellite broadcasting or digital television (D-TV, hereinafter referred to as D-TV) that displays digital high-definition video of the DVD more clearly. It is expected to spread.

Accordingly, the use of the DVD player (or DVD recorder / player) for playing the DVD and the D-TV is expected to increase rapidly, and the communication standard of IEEE 1394 is required for data transmission between the devices. Employment is confirmed.

On the other hand, the DVD player processes the MPEG data digital data stream, in particular, the program stream (Program Stream, hereinafter referred to as PS) into presentation (PT) data and navigation data (Navigation, NV). The presentation data PT is output as a video / audio signal, and the navigation data NV is used to control the playback operation of the DVD player.

However, unlike the DVD player, the D-TV processes video / audio signals by processing MPEG data digital data streams, in particular, a transport stream (TS), as presentation data. Since the DVD player converts the PS into a TS and transmits the signal, or the D-TV converts the input PS into a TS and processes the signal.

Therefore, as an example of a device for converting a format of a digital data stream as described above, a configuration and an operation of a conventional PS / TS converter for converting a PS into a TS and a DVD player and a D-TV according to the present invention will be described below with reference to the accompanying drawings. The explanation is as follows.

FIG. 1 is a block diagram of a general optical disc apparatus and a video display apparatus for transmitting and receiving data using the IEEE 1394 interface, and a DVD player and a D-TV are shown as an example.

1 shows an optical disc (DVD) 1, an optical pickup (P / U) 2 for reading recording data from the optical disc, and a demodulation section 3 for demodulating and error-correcting the read data. A scrambler (Scrambler or CSS) for adding a copy protection code to the output data of the demodulator, and a selection output unit 5 for selecting an output path of the data to which the copy protection code is added; The data stream input from the selective output unit, that is, the program stream, is divided into presentation data (PT: Presentation), and navigation data (NV: Navigation, hereinafter NV). Data parser 6 for separating / outputting PT data into audio, video and sub picture data, and respective decoders 7 for decoding the separated audio, video and sub picture data. 8,9) and the decoded A presentation engine (10) for outputting a digital audio signal and a video signal by combining audio, video and subpicture data, and a D / A for converting and outputting the digital audio signal and the video signal into analog video and audio signals, respectively. A navigation manager for controlling the reading operation of the optical disc so as to receive the NV data which are divided and outputted from the converters 11 and 12 and the data separating unit 6 and perform an operation corresponding to a user's key input; And a PS / TS converter 14 for converting the output data output from the selective output unit 5, that is, the program stream PS into a transport stream TS, and the converted transformer. A DVD player S1 including an IEEE 1394 interface unit 15 for transmitting a port stream TS;

Demuxing the IEEE 1394 interface unit 21 that receives the data stream transmitted from the DVD player S1, that is, the transport stream TS, and the transport stream TS received from the interface unit 21. Demux 23 for separating and outputting audio and video data, and decoders 24 and 25 for decoding and outputting the separated and output audio and video data, respectively, as digital audio signals and video signals. ), D / A converters 26 and 27 for converting / outputting the digital audio and video signals into analog audio and video signals, and a user interface controller for outputting a control signal in response to a user's key input. D-TV (S2) comprising a 22,

It is shown that the user key input means 100 for controlling the operation of the DVD player (S1) and the D-TV (S2).

2 is a detailed configuration diagram of a conventional PS / TS converter. Each data packet constituting the PS by receiving the output data of the selective output unit 5, that is, the program stream PS, is described above. The header of the packet is decoded, the ID of the data stream included in the packet header is detected, and the navigation data NV, the presentation data PT, and the data stream are included in the program stream PS. Demuxing the packet header decoder 41 for separating / outputting system clock data and for each component data of the separated presentation data PT, that is, audio and video (including subpicture) data. Demux 42 to separate / output and buffer audio and video data separated / output from Demux 42, and read out at a speed faster than the input speed. (Buffer) (43,44) and the packet The interpreter 47 which interprets the system clock data separated and output from the decoder 41 and compares the interpreted system clock with a reference system clock (STC) Receives the program specification information (PSI: Program) by receiving the timing controller 49 which controls the data read timing and the data transfer timing of the buffers 43 and 44 and the navigation data NV separately outputted from the packet header decoder 41. An additional information generating unit 46 for adding and outputting a specific information analysis and cyclic redundancy check (CRC) code; the additional information generating unit 46, buffers 43 and 44, and a timing controller 49; The operation of the TS packetizer 45 and the buffers 43 and 44 and the timing controller 49 which packetize and output the program stream PS into the transport stream TS according to the output of Controls / compensates 48 to control and compensate It shows a box adapted to.

Prior to the description of the operation of the conventional PS / TS converter and the DVD player and the D-TV configured as described above, the format of the digital data stream, i.e., the program stream PS and the transport stream TS, of the MPEG method is described. Briefly explain the differences.

The program stream PS is a data stream composed of a plurality of packets in which audio data, video data, and additional information data, which are digital data, is one packet. The packet has a variable length. The size of the data stream can be changed according to the size of the data. Therefore, the size of each packet is not always the same. For example, if the size of the data packet is set to 2Kbyte, and the arbitrary data size exceeds the 2Kbyte, a part of the arbitrary data can be continuously inserted into the next subsequent packet, and the arbitrary data size can also be inserted. If less than 2Kbyte, a padding area may be created in the extra portion of the packet, and another arbitrary data may be inserted and used according to the size of 2Kbyte.

On the other hand, the transport stream TS has a fixed size of a data stream. For example, an audio packet 188 bytes, a video packet 188 bytes, and content can be determined. Twelve packets consisting of ten packets, one audio packet, and one additional information data packet are configured and used as a group.

Therefore, in order to convert the program stream PS into the transport stream TS, the size of the program stream PS packet is adjusted to the size of the transport stream TS packet, for example, 188 bytes, and is sequentially divided. It should be changed and configured on the time axis. At this time, various necessary headers are added and converted.

Hereinafter, operations of the conventional PS / TS converter and the DVD player and the D-TV according to the related art will be described. As shown in FIG. 1, a program stream PS that is first read and processed from an optical disc (DVD) is described above. Separated and outputted as audio, video and sub-picture data by a Parser 6, respectively, and audio and video signals by the decoders 7, 8, 9, the presentation engine 10 and the D / A converter. When the program stream PS is input to the PS / TS converter 14 by the selection output unit 5, the packet header decoder 41 is input as shown in FIG. The program stream PS is decoded to interpret the stream ID, and the program specification information PSI, which is information for controlling the navigation data NV included in the program stream PS, in particular, the program reproduction, audio and video Presentation data corresponding to the signal (PT) , Separated by respective separate the system clock data (SCD).

The separated program specification information (PSI) is information for controlling program reproduction. The separated program specification information (PSI) is input to the additional information generation unit 46 and converted into data to which a CRC is added. The system clock data SCD is interpreted by an interpreter ( 47 is inputted to the system clock, and is then compared with the reference system clock STC by the timing controller 49 again. Meanwhile, the presentation data PT is output as audio, video, and subpicture data by the demux 42. The subpicture data is video data that is typically signal-processed into a subtitle image or a PIP image. The data is batch-processed with the data and applied to the video buffer 43 having a 2 Kbyte buffer capacity, and the audio data is applied to the audio buffer 44 having a 4 Kbyte buffer capacity. Audio and video (including subpicture) data stored in the buffers 43 and 44 at an input speed of 10.08 Mbps, respectively, are output at a read speed of 19.28 Mbps or more under the control of the control / compensator 49.

In this way, the output and generated data is converted into a transport stream TS by the packetizer 45, and the converted transport stream TS is converted into an IEEE 1394 interface unit 15, 16), to the D-TV S2.

The input transport stream TS is displayed as an audio and video signal through a demux 23, a decoder 24, 25, and a D / A converter 26, 27 configured in the D-TV S2. For example, the transport stream TS is transmitted in an isochronous data packet structure having isochronous property, and a user selection key selected from the D-TV S2, that is, navigation. Command is an asynchronous data packet structure having asynchronous, and is transmitted to the DVD player S1 so that the navigation manager 13 controls the navigation operation according to the user interface. .

In this way, the conventional PS / TS converter and the DVD player and the D-TV, which are constructed and operated, include the sub-picture data in the video data and collectively process them so that the image displayed on the D-TV S2, in particular, the sub-picture In order to selectively display the subtitle image or the PIP image generated by the data, the user must control the DVD player S1, which is inconvenient in use, and as described above, the subpicture included in the video data and processed in a batch In order to separate and control the data separately, another complicated algorithm is required, which causes a complexity, a large size, and a delay in processing speed.

In addition, the navigation data NV transmitted to the D-TV S2 is program specification information PSI for controlling program reproduction. As described above, in order to change a program list or the like, the user must There was a problem to control the DVD player S1.

Therefore, the present invention was created to solve the above problems, and when converting the format of the data stream into a data stream of a predetermined format for transmitting or receiving an MPEG data format, An object of the present invention is to provide an apparatus and method for converting a digital data stream format for adding and converting additional information data for classifying picture data and controlling a program list.

1 is a block diagram of an optical disk apparatus and a video display apparatus using a conventional IEEE1394 interface,

2 is a block diagram of a conventional program stream (PS) / transport stream (TS) converter,

3 is a block diagram of an optical disk apparatus and an image display apparatus to which the apparatus and method for converting a digital data stream format according to the present invention are applied.

4 is a block diagram of a program stream (PS) / transport stream (TS) converter which is an embodiment of a digital data stream format conversion apparatus according to the present invention,

5 shows a format structure of a data packet,

6 shows a data stream identifier (ID),

7 illustrates the structure of an asynchronous command and response packet,

8 illustrates an asynchronous packet structure,

9 shows the structure of a CIP header,

10 illustrates an isochronous communication format.

※ Explanation of code for main part of drawing

80: data selector 81: packet header decoder (Decoder)

82: Demux 83,84,85: Buffer

86: additional information generating unit 87: TS packetizer (Packetizer)

88: Interpreter 89: control / compensator

90: timing controller

According to an aspect of the present invention, there is provided a method of converting a digital data stream format, the method comprising: separating and extracting the digital data stream into audio, video, and subpicture data streams during format conversion of a received digital data stream; A second step of discriminating and storing each extracted data stream; And a third step of constructing and outputting the separately stored data stream into data packets of a target format.

In addition, the digital data stream format conversion method according to the present invention, the format conversion of the received digital data stream, the first step of separating and extracting the presentation data and the navigation data from the digital data stream; A second step of decomposing the extracted presentation data into its configuration data; And a third step of combining the extracted navigation data and the decomposed configuration data into a data stream having a format different from that of the digital data stream.

In addition, the apparatus for converting a digital data stream format according to the present invention is a format converting apparatus for digital data stream, comprising: separating means for separating and extracting a program stream included in the digital data stream and first navigation data for program list control; ; Analyzing means for analyzing the extracted program stream and decomposing it into system clock data, presentation data, and second navigation data for program reproduction control; Decomposition means for subdividing and storing the decomposed presentation data into respective configuration data; Time information generating means for generating a data packet transmission reference time based on the decomposed system clock data; Control information converting means for converting the extracted and decomposed first navigation data and second navigation data into additional data added to the data packet; And data structuring means for combining the respective constituent data and the additional data and constituting and outputting the configurable data into a data stream having a predetermined format based on the reference time.

In the digital data stream format conversion device and method according to the present invention, the input data stream is divided into audio, video and subpicture data, respectively, when the input data stream is converted into a data stream having a predetermined format. Converts and transmits both the first navigation data for variably controlling a program list and the like and the second navigation data for controlling program reproduction, which are included in the input data stream. A connection device that receives a data stream of a predetermined format and processes the signal can selectively control whether to output a subtitle image or a PIP image corresponding to the sub picture data, as well as change a program list by the first navigation data. You can control the operation.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a block diagram of an optical disk apparatus and a video display apparatus to which the apparatus and method for converting a digital data stream format according to the present invention are shown, showing a DVD player and a D-TV as an embodiment.

3 shows an optical disc (DVD) 51, an optical pickup (P / U) 52 for reading recorded data from the optical disc, and a demodulator 53 for demodulating and error correcting the read data. And a scrambler (Scrambler or CSS: Copy Protect System) 54 for adding a copy protection code to the output data of the demodulator, and a selective output unit 55 for selecting an output path of the data to which the copy protection code is added. The data stream input from the selective output unit, that is, the program stream, is divided into presentation (PT) data and navigation data (NV), and the divided PT data is further divided into audio, video, and sub-pictures. Data parser 56 for separating / outputting picture data, and respective decoders 57, 58, 59 for decoding the separated audio, video and subpicture data, and the decoded audio and video data. And standing A presentation engine 60 that combines picture data to output digital audio and video signals, and a D / A converter 61 for converting and outputting the digital audio and video signals into analog video and audio signals, respectively; 62) and a navigation manager (Navigation Manager) for controlling the reading operation of the optical disk to receive the NV data divided and outputted separately from the data separator (Parser) 56 to perform an operation corresponding to a user's key input. 63, a PS / TS converter 64 for converting output data output from the selective output unit 55, that is, a program stream PS into a transport stream TS, and the converted transport stream TS. DVD player S1 comprising an IEEE 1394 interface 65 for transmitting ()),

Demuxing the IEEE 1394 interface unit 71 for receiving the data stream transmitted from the DVD player S1 and the data stream received from the interface unit 71, that is, the transport stream TS Demux 73 for separating / outputting the video and subpicture data, and decoding the separated / output audio, video and subpicture data, respectively, and outputting them as digital audio, main video and sub-picture signals. Decoders 74, 75 and 76, an overlay unit 77 for selectively overlaying the main video signal and the sub video signal and outputting the video signal, and the digital audio and video signals as analog audio. And a D / A converter (78,79) for converting / outputting an image signal and a user interface controller (72) for outputting a control signal in accordance with a user's key input. )Wow,

It is shown that the user key input means 100 for controlling the operation of the DVD player (S1) and the D-TV (S2).

4 is a detailed configuration diagram of a PS / TS converter, which is an embodiment of an apparatus for converting a digital data stream format according to the present invention. The output data of the selective output unit 55 as described above is received to provide a program list. The first navigation data to control the first navigation data, in particular, VMGI (Video Management Information) or VTSI (Video Title Setting Information) data, a data selector 80 for separating and outputting a program stream PS, and the outputted program. Decode each data packet header of the stream PS to detect the ID of the data stream included in the packet header, and the navigation data NV included in the program stream PS. That is, a packet header decoder 81 for separating / outputting second navigation data for controlling program reproduction, presentation data PT and system clock data SCD, Demux 82 which demuxes and separates / outputs each component data of pre-separated presentation data PT, that is, audio, video and shove picture data, and the demux ( 42, 84, 85, and the packet header decoder 81 for buffering audio, video, and sub-picture data separated / output from the data and then reading them at a speed faster than the input speed. An interpreter 88 for interpreting the separated and output system clock data, and comparing the interpreted system clock with a reference system clock (STC: System Time Clock); A timing controller 90 for controlling the data read timing and the data transfer timing of the 85 and the first and second navigation data NV output separately from the data selector 80 and the packet header decoder 81. First for receiving the program list (Title) control An additional information generating unit 86 for analyzing navigation data and program specific information (PSI) and adding a Cyclic Redundancy Check (CRC) code; the additional information generating unit 86 and a buffer 83; TS packetizer for packetizing the program list control data and the program stream PS into a transport stream TS according to the outputs of the first and second controllers 84 and 85 and the timing controller 90 ( 87, and a control / compensation unit 89 for controlling and compensating the operation of the buffers 83, 84, 85 and the timing controller 90.

Hereinafter, operations of the DVD player and the D-TV to which the PS / TS conversion apparatus and method according to the present invention are applied will be described. As shown in FIG. 3, a program stream (PS) which is first read and processed from an optical disc (DVD) ) Are separated and output as audio, video, and subpicture data by the data parser 60, and the decoders 57, 58, 89, the presentation engine 60, and the D / A converter 61 are respectively outputted. And a data stream read out from the optical disc (DVD) by the selective output unit 55 by the selective output unit 55, are input to the PS / TS converter 64. As described above, the data stream includes first navigation data, in particular, VMGI (Video Management Information) for variably controlling (reproducing) a plurality of program lists recorded on the DVD 51 by the data selection unit 80. Or Video Title Setting Information (VTSI) data and a program stream. The first navigation data is data which is not packed in the program stream PS. On the other hand, the packet header decoder 81 decodes the program stream PS outputted separately, interprets the stream ID, and controls the second navigation data NV included in the program stream PS, in particular, program reproduction. The program specification information (PSI), which is information to be described, the presentation data (PT) corresponding to the audio and video signals, and the system clock data (SCD) are respectively separated and separated.

The separated program specification information PSI, that is, the second navigation data, is information for controlling program reproduction, and additional information together with first navigation data for variably controlling (reproducing) the plurality of program lists. The system clock data SCD is input to the generation unit 86 and converted into data to which the CRC is added. The system clock data SCD is input to the interpreter 88 and output to the system clock. Compared to (STC). Meanwhile, the presentation data PT is output as audio, video, and subpicture data by the demux 82, in particular, the subpicture data is video data which is typically signal-processed into subtitle images or PIP images. As an example, the video data is applied to a separate sub-picture buffer 83 having a buffer capacity of 4 Kbytes to be processed separately from the video data, and the video data is applied to a buffer 84 having a buffer capacity of 4 Kbytes. The audio / video and subpicture data applied to the audio buffer 8 having a buffer capacity of 4 Kbytes and stored at the input speeds of 10.08 Mbps in the buffers 83, 84 and 85, respectively, is controlled by the control / compensator 89 ), It is output at read speed of 19.28Mbps or more.

In this way, the output and generated data is converted into a transport stream TS by the packetizer 87, and the converted transport stream TS is converted into an IEEE 1394 interface unit 65, 66), to the D-TV S2.

The input transport stream TS outputs digital audio and video data through a demux 73, a decoder 74, 75, 76, and an overlapping unit 77 configured in the D-TV S2. The digital audio and video data are displayed as audio and video signals via the D / A converters 78 and 79. The superimposed unit 77 outputs a caption video or PIP video signal to the output main video signal. Is optionally displayed.

As described above, the transport stream TS is transmitted in an isochronous data packet structure having isochronousness, and a user selection key selected in the D-TV S2. The navigation command corresponding to is an asynchronous data packet structure having an asynchronous time, and is transmitted to the DVD player S1 so that the navigation manager 63 performs a navigation operation according to a user interface. In addition to playing the program, the program list (Title) can be selected and variably controlled.

As described above, a data stream and a data packet structure used in the PS / TS converter and the DVD player and the D-TV according to the present invention, which are constructed and operated, will be briefly described as follows.

Fig. 5 shows the format structure of a data packet. A pack header of 14 bytes is provided at the head of the data packet, followed by a packet header, audio, video, and subpicture. (Sub Picture) data is constructed, and a Sub Stream ID is formed between the Packet Header and the Audio, Video, and Sub Picture data, and as described above, A padding area for adjusting the length of the pack to a predetermined length is formed after the data.

FIG. 6 illustrates a format for the stream ID. The stream ID corresponds to one-to-one (1: 1) according to the type of a pack.

7 illustrates the structure of an asynchronous command and response packet, and is largely divided into a packet header and a data block. The user interface data transmission having the same time is configured to be performed, and FIG. 8 illustrates an isochronous pack structure having isochronous property. ) Is composed of a packet header, a header CRC, a data field, and a data CRC. The packet header includes a date length indicating a length of data; It consists of a tag indicating the type of data, a channel indicating channel numbers (0 to 63) of the packet, a Tcode indicating a processing encoder, and a Sy which is a synchronization code. 9 shows the format of CIP (Common Isochronous Paket), where the header of the CIP is a transmission node. (Node) number SID, packetization unit DBS, data division number Fn in packetization, QPC added to adjust the length of the divided data to a predetermined length, SPH as a flag of the source packet header, packet It consists of DBC, format FMT and format dependent field FDF which detects the missing of Rsv, and Rsv is used as spare area.

10 shows isochronous communication, that is, a cycle start, an isochronous channel, and an isochronous in communication with an AV device connected to a bus. ) Indicates that packets are transmitted at regular intervals.

An apparatus and method for converting a digital data stream format according to the present invention as described above includes a caption image or a picture in picture (PIP) image according to a user's key input in a video display apparatus for receiving a data stream converted into a predetermined format. Can be selectively displayed, and the navigation operation of the optical disc apparatus that transmits the data stream can be variably controlled, in particular, the program list (Title), so that the subtitle image or the PIP image can be variable, selected, or the optical disc. In order to control the navigation operation of the device is a very useful invention that can essentially eliminate the inconvenience of having to control the optical disk device.

Claims (5)

When converting the format of an incoming digital data stream, Separating and extracting the digital data stream into audio, video and subpicture data streams; A second step of discriminating and storing each extracted data stream; And And a third step of constructing and outputting the separately stored data stream into data packets of a target format. The method of claim 1, And the received digital data stream and the data stream output in the third step are a program stream and a transport stream, respectively. When converting the format of an incoming digital data stream, A first step of separating and extracting presentation data and navigation data from the digital data stream; A second step of decomposing the extracted presentation data into its configuration data; And And synthesizing the extracted navigation data and the decomposed configuration data into a data stream having a format different from that of the digital data stream. The method of claim 3, And the data stream output in the third step is transmitted isochronously. In the format converter of a digital data stream, Separating means for separating and extracting a program stream included in the digital data stream and first navigation data for program list control; Analyzing means for analyzing and extracting the extracted program stream into system clock data, presentation data, and second navigation data for program reproduction control; Decomposing means for subdividing and analyzing the decomposed and analyzed presentation data into respective component data; Time information generating means for generating a data packet transmission reference time based on the decomposed system clock data; Control information converting means for converting the extracted and decomposed first navigation data and second navigation data into additional data added to the data packet; And And data configuration means for combining the respective configuration data and the additional data, and outputting the configuration data to a data stream having a predetermined format based on the reference time.