KR20000046816A - Device and method for storing transport stream - Google Patents

Abstract

PURPOSE: A device and a method for storing a transport stream are provided to repeatedly play back by storing the transport stream of MPEG standard with converting to a program stream. CONSTITUTION: A PCR(program clock reference) information is detected by detecting a TC header from a transport stream of MPEG standard. An SCR(system clock reference) information is generated by counting the detected PCR information. One packet is generated by connecting a certain number of PESs(packet elementary stream) except the TS header. A header of generated packet is converted to a program stream by adding the SCR information. The converted program stream is recorded in a recording medium.

Description

Transport stream storage device and method

TECHNICAL FIELD The present invention relates to video recording, and more particularly, to a transport stream storage device and method for reproducing a transport stream in digital broadcasting.

Currently, digital TV broadcasting includes digital satellite broadcasting through satellites and terrestrial digital broadcasting using terrestrial waves, and cable digital broadcasting will be implemented soon.

Although the transmission media (satellite, terrestrial, cable) are distinctly different in these three broadcasting methods, video / audio compression and packet composition are almost the same.

Therefore, the transmission formats of these broadcast signals are almost similar.

Currently, digital broadcasting uses MPEG2 Transport Stream (TS), which is an international standard, as a basic transport format, which is defined in the ISO / IEC 13818-1 standard.

'TS' is configured by multiplexing various Program Specific Information (PSI) such as video packet (Video PES; Packetized Elenentary Stream), audio packet (Audio PES), and program guide. Elementary Streams).

In this case, the video ES is usually composed of data of a video picture layer, and the video picture layer data is composed of a picture header and the rest of the video data.

Therefore, by properly collecting the picture layer data in the video ES, one picture can be constructed, and usually one picture is the same as one picture frame.

Therefore, when a digital broadcast transmitter transmits a broadcast signal in which multiplexed packets of video, audio, and additional information are multiplexed with each other, the digital broadcast receiver receives the broadcast signal and tunes a desired channel to restore the original video / audio signal. As a result, the viewer listens to the audio corresponding to the image output to the speaker while watching the image displayed on the screen.

A conventional transport stream decoding circuit is constructed as shown in the block diagram of FIG. 1, and the operation thereof is as follows.

First, the transport stream TS having the format as shown in FIG. 2 from the FEC decoder 101 is stored in the buffer 103 through the FEC interface unit 102, and the transport stream TS stored in the buffer 103 is stored in memory. The TS header decoder 106 detects the TS header by being output through the buffer 105 under the control of the controller 104.

At this time, the field decoder 107 detects an 'Adaptation Field' from the TS header and decodes various information for restoration.

Thereafter, the PES decoder 108 extracts a packet elementary stream (PES) based on the TS header, and separates the extracted PES into video and audio packets, and separates the separated video and audio packets into an external interface unit 109. Through the video decoder 110, the audio decoder 111 and the other decoder 112 is output through.

Accordingly, by restoring the original video / audio signal through the decoders 110 to 112, the viewer listens to the audio corresponding to the video output through the speaker while watching the video displayed on the screen.

The operation timing in the above is controlled by the clock of the voltage controlled oscillator 114 generated by the clock controller 113.

In addition, the conventional program stream decoding circuit is configured as shown in the block diagram of FIG. 3, and the FEC interface unit 102, the TS header decoder 106, and the field decoder 107 in the circuit of FIG. Only the parts are replaced by the DVD interface unit 302, the packet header decoder 307, and the system header decoder 308, respectively.

Therefore, when the decoder of FIG. 3 outputs the program stream PS having the same format as that of FIG. 4 through the buffer 305 under the control of the memory controller 304, the packet header decoder 306 detects the packet header and the system header. The controller 307 detects the system header from the packet header detected above.

At this time, the PES decoder 308 extracts the PES based on the packet header and separates the PES into video and audio packets, and separates the separated video and audio packets through the external interface unit 309 through the video decoder 310 and the audio decoder ( 311) and other decoders 312.

Accordingly, by restoring the original video / audio signal through the decoders 310 to 312, the viewer listens to the audio corresponding to the video output through the speaker while watching the video displayed on the screen.

That is, the decoding circuit of Fig. 1 or Fig. 3, each of which has a transport stream or a program stream from a channel interface (e.g., a VSB interface) as an input, interprets the respective headers to extract information about the timing of the system and the respective headers. Remove PES by removing it.

Thereafter, the header of the PES is analyzed to extract information on the timing of the 'Presentation', and the header is removed to extract an ES (elementary stream) of video, audio, and additional information.

Accordingly, the timing information of the system (PCR; Program Clock Reference or SCR; System Time Clock updated with the System Clock Reference) and the timing information of the 'Presentation' (PTS; Presentation Time Stamp, DTS; Decoding Time Stamp) Is transmitted together with each ES to each decoder to decode and reproduce the video and audio signals reconstructed by the decoding.

However, in the related art, a program stream can be repeatedly played back, but in the case of a transport stream, only video and audio packets can be decoded and played back in real time.

That is, conventionally, when decoding a transport stream, since recording is impossible, repeated playback cannot be performed.

Accordingly, an object of the present invention is to provide a transport stream storage device and method invented to repeat playback by converting and storing an MPEG standard transport stream into a program stream to improve the conventional problem. There is this.

1 is a block diagram of a conventional transport stream decoding circuit.

2 shows an example of a format of a transport stream.

3 is a block diagram of a conventional program decoding circuit.

4 is an exemplary view showing a format of a program stream.

5 is a block diagram of an apparatus for practicing the present invention.

6 is an operational flow diagram for practicing the present invention.

Explanation of symbols on the main parts of the drawings

507: TS header decoder 508: field decoder

516 PCR / SCR converter 517 program stream encoder

518: video recording / playback unit

The present invention provides a TS header decoder for detecting a TS header from an MPEG standard transport stream in an apparatus for reconstructing an MPEG standard transport stream and a program stream to an original video / audio signal in order to achieve the above object. And a field decoder for detecting PCR (Program Clock Reference) information by detecting the 'Adaptation' field from the TS header detected above, and PCR / for generating SCR (System Clock Reference) information by counting the detected PCR information. A program stream encoder for generating a packet by connecting an SCR converter and a predetermined PES extracted based on the TS header, and generating the program stream by adding the SCR information to the header of the generated packet; And a recording / reproducing section for recording the program stream in the storage medium.

In order to achieve the above object, the present invention also provides a method of detecting a TS header from a transport stream of MPEG standard to detect PCR (Program Clock Reference) information, and counting the detected PCR information to SCR. Generating system clock reference information, connecting the PESs extracted based on the TS headers to a single stream, and adding SCR information to the headers of the generated streams as program streams. And converting the converted program stream to a storage medium.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 5 is a block diagram of a circuit for an embodiment of the present invention, as shown therein, with an FEC interface unit 502 which receives a transport stream TS from an FEC decoder 501 and stores it in a buffer 503; And a memory controller 504 for storing and outputting the transport stream TS stored in the buffer 503 to the DRAM 505 and synchronizing with the transport stream TS output by the control of the memory controller 504. A synchronization detector 506 for detecting a signal Sync, a TS header decoder 507 for detecting a TS header based on the synchronization signal Sync detected by the synchronization detector 506, and a TS header detected above. Field decoder 508 that detects PCR (Program Clock Reference) information by detecting the 'Adaptation Field' from the program controller, and stores a program stream from the DVD player 520 that is input through the DVD interface unit 521 to store a program controller. A buffer 522 output to 504, A packet header decoder 524 for detecting a packet header based on a packet start code detected by a packet start code detector 523 from a program stream PS output by the control of the memory controller 504, and the packet header A system header control unit 307 which detects a system header from the system, and extracts a packet elementary stream (PES) based on the TS header or packet header and separates the video header into video and audio, and separates the separated video and audio packet into an external interface PES decoder 509 for outputting to an external video decoder, audio decoder, etc. via 510, voltage controlled oscillator 513 for generating timing clock for operation of the system by clock controller 113, and overall operation A host interface unit 514 for interfacing with a microcontroller (MCU) 515 that controls the control unit, and a transport stream of an MPEG standard. The TS header decoder 507 detects the TS header and extracts the PES packet by detecting the synchronization signal Sync from the TS header decoder 506, and detects the 'Adaptation' field from the TS header detected above by PCR ( A field decoder 508 for detecting Program Clock Reference) information, a PCR / SCR converter 516 for generating System Clock Reference (SCR) information by counting PCR information detected by the field decoder 508, and A program stream encoder 517 for generating a packet by connecting predetermined PESs to each other, and adding the SCR information to the header of the generated packet to generate a program stream. The video recording / reproducing section 518 records the recording medium.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

The present invention is a system for extracting timing information and respective ESs by inputting a transport stream and a program stream and inputting them to a decoder, wherein a desired program is selected from among transport streams of several programs input through one physical channel. It is possible to repeat playback by separating the transport stream of PES into a packetized elementary stream (PES) and encoding the PES back into a program stream in the encoder 517 and recording it on a tape in a video recording / playback unit 518 such as a digital VCR. It is to make it.

To this end, the PCR / SCR converter 516 counts PCR information detected in the transport stream to generate SCR information, and the program stream encoder 518 converts the PES into a program stream according to the protocol of the MPEG program stream, and then the SCR. The information is added to the packet header of the converted program stream to adjust the timing of reproduction of this program stream.

That is, in the present invention, when the transport stream is stored using a data path separate from the data path for displaying on the screen in real time, the program stream encoder 517 generates a PES generated when data for display on the screen is generated. The video recording / reproducing unit 518 such as a digital VCR converts the data into a storage medium.

Thereafter, during playback, the program stream reproduced by the video recording / reproducing section 518 is inputted to the apparatus of the present invention through the DVD interface section 504, thereby enabling repeat playback.

On the other hand, the operation of the present invention as described above in detail as follows.

First, the transport stream TS having the format as shown in FIG. 2 from the FEC decoder 501 is stored in the buffer 503 through the FEC interface unit 502, and the transport stream TS stored in the buffer 503 is stored in memory. It is stored in the DRAM 305 under the control of the controller 504 and then output.

At this time, when the synchronization detector 506 detects the synchronization signal Sync from the transport stream TS, the TS header decoder 507 detects the TS header based on the synchronization signal Sync, and the field decoder 508 'Adaptation Field' is detected from the TS header to decode various information including PCR information.

Therefore, if the broadcast mode is set, the PES decoder 509 extracts a packet elementary stream (PES) based on the TS header, separates the extracted PES into video, audio packets, and the like, and separates the separated video and audio packets from the outside. The video is output to the video decoder and the audio decoder through the interface unit 510.

Accordingly, by restoring the original video / audio signal, the viewer listens to the audio corresponding to the video output through the speaker while watching the video displayed on the screen.

If the recording mode is set while listening to the broadcast, the PCR / SCR converter 516 counts PCR information detected by the field decoder 508 to generate SCR information, and sends the generated SCR information to the program stream encoder 517. Will print.

In this case, the program stream encoder 517 connects the remaining PESs by the TS header decoder 507 to predetermined PESs to generate one packet, and adds SCR information as a header to the generated packets.

Accordingly, the video recording / reproducing section 518 records the program stream in the program stream encoder 517 in the video cassette.

That is, after the PES is extracted, the broadcast listening or recording operation is performed by the same process as the operation flowchart of FIG. 6.

Thereafter, when the video recording / reproducing section 518 is set to the playback mode, the program stream recorded in the video cassette is detected and stored in the buffer 523 through the DVD interface section 521.

At this time, if the program stream stored in the buffer 523 is stored in the DRAM 505 by the memory controller 504 and then output, the packet start code detector 523 is output by the control of the memory controller 504 ( PS) to detect the packet start code.

Accordingly, when the packet header decoder 524 detects the packet header based on the packet start code, the system header controller 307 detects the system header from the packet header.

At this time, the PES decoder 509 extracts a packet elementary stream (PES) based on a packet header and separates the packet elementary stream into video, audio, and the like, and separates the separated video and audio packets through an external interface unit 510; Output to an audio decoder, etc.

Therefore, by restoring the original video / audio signal, the viewer listens to the audio corresponding to the video output to the speaker while watching the video displayed on the screen.

That is, according to the present invention, the transport stream is converted into a program stream, recorded, and repeatedly played.

Meanwhile, although the above-described method of converting a transport stream into a program stream and recording the same in a storage medium has been described, separately, a transport stream of several programs can be parsed to generate a PES and recorded in the storage medium.

As described in detail above, the present invention has the effect of repeating playback by converting the transport stream inputted from the receiving end of the MPEG stream back into a program stream and recording it on a storage medium.

Claims (3)

An apparatus for restoring an MPEG standard transport stream and a program stream to an original video / audio signal, comprising: a TS header decoder for detecting a TS header from an MPEG standard transport stream, and an 'Adaptation' field from the TS header Field decoder for detecting PCR (Program Clock Reference) information, a PCR / SCR converter for counting PCR information to generate SCR (System Clock Reference) information, and a PES extracted based on the TS header. A program stream encoder for generating a single packet by connecting a predetermined number and adding the SCR information to the header of the generated packet, and a recording / reproducing unit for recording the program stream in the encoder onto a storage medium. Transport stream storage device characterized in that the configuration. A method for restoring an MPEG standard transport stream and a program stream to an original video / audio signal, the first step of detecting a program header reference (PCR) information by detecting a TS header from an MPEG standard transport stream And a second step of generating the system clock reference (SCR) information by counting the detected PCR information, and generating a single packet by connecting predetermined PES except for the TS header to each other. And a fourth step of converting the SCR information into a program stream by adding the SCR information to the header of the generated packet, and a fifth step of recording the converted program stream in a storage medium. The method of claim 2, further comprising the step of reproducing the recording signal of the storage medium.