KR20040018417A - Recording medium for storing additional information so as to ensure seamless playback between data stream - Google Patents

Abstract

PURPOSE: A recording medium for storing additional information to secure continuous regeneration between stream object information is provided to regenerate stream objects without discontinuation by using stream object information including seamless information and seamless time control information. CONSTITUTION: A first area includes a plurality of SOBs(Stream Object) formed in a type of packetized data to which arrival time stamp of the corresponding packet data is added. A second area has extra SOB information for each SOB in the first area, and has SOB information including seamless information representing seamless regeneration with a preceding SOB and seamless time control information controlling an output point of the corresponding SOB to be reproduced continuously.

Description

Recording medium for storing additional information so as to ensure seamless playback between data stream}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to the field of recording and / or reproducing digital data, and in particular, a method of generating additional information for ensuring continuous reproduction between data streams in the form of packetized data, a recording medium and recording medium for storing the information, A editing and / or reproducing apparatus.

Packet data is used in digital satellites, digital terrestrial, digital cable broadcasting or ATM transmission networks. The conceptual relationship between the input of general packet data, the basic form of data recorded with the arrival time added, and the data output time at the time of reproduction is shown in FIG. Arrival time stamp (ATS) is added to the input data for recording, and then data is output using the arrival time information added during reproduction. Here, the input data is packetized data, and the packetized data is data, such as video and audio, divided into units of a predetermined size and transmitted through a satellite, a cable, or a local area network (LAN). The unit of size is 188 bytes when using a Moving Picture Experts Group (MPEG) -2 transport stream of ISO / IEC 13818-1 standard, and 53 bytes when using an Asynchronous Transfer Mode (ATM) standard.

In digital broadcasting, time intervals between packet data in a packet data format are transmitted unevenly. The transmitted packet data is generally decoded by the decoder after passing through the buffer of the receiver having the decoder so that the user can watch the broadcast.

When the packet data is temporarily stored and played back at a desired time, the playback device outputs the data to the decoder. In this case, the unspecified time interval in which the original packet data has been transmitted has a significant meaning. The reason is that if this is not observed, the receiving buffer will overflow or underflow. This is because the original transmission side (broadcasting station) adjusts and transmits the time interval between packet data in consideration of the state of the buffer on the receiving side having the decoder. For this reason, information regarding the time of arrival at the recording apparatus in packet units is added to all packets, recorded, and then outputted by the reproduction apparatus using the same.

FIG. 2 is a block diagram of an apparatus for recording and reproducing packet data shown in FIG. In Fig. 2, the counter 102, which is operated by the system clock signal, generally uses the 27 MHz system clock signal because the MPEG-2 system generates all the time stamps by using the 27 MHz clock signal as a base. . Of course, other frequency system clock signals may be used.

The ATS generator 104 adds arrival time information (ATS) for each packet data input, and the recording data to which the ATS is added is converted into a signal suitable for recording by the recording controller 106 and recorded on the recording medium 108. . The reproduction controller 110 reproduces the data to which the ATS recorded on the recording medium 108 is added, and provides the reproduction data to the ATS processor 112. FIG. The ATS processor 112 outputs data in accordance with the ATS added to the reproduction data. Here, the ATS generator 104 and the ATS processor 112 have an internal buffer, which may be configured separately from the outside.

More specifically, the method of adding the ATS, in writing, the ATS generator 104 reads the count value of the counter 102 at the moment the packet data is input and adds it to the arrival time information (ATS) of the packet. do. Packet data appended with the ATS is temporarily stored in a buffer inside the ATS generator 104 and then recorded on the recording medium 108 via the recording controller 106. As described above, this internal buffer may be separately configured externally.

At the time of reproduction, the reproduction controller 110 reproduces the packet data to which the ATS is added from the recording medium 108 and provides it to the ATS processor 112. The ATS processor 112 has a buffer of a predetermined size therein, and when the buffer overflows, data reading is stopped for a while, and the reading is repeated again when the buffer becomes empty. The ATS processor 112 also reads the arrival time information and packet data of the first packet from the internal buffer, sets the counter 102 as the arrival time information, and outputs the packet data. At this time, the data output from the ATS processor 112 is pure packet data from which arrival time information has been removed. Subsequent packet data are compared with the added arrival time information and the count value of the counter 102 to output the packet data only when the same value is reached. The internal buffer of the ATS processor 112 may also be configured externally. Through this process, the packet data that was originally transmitted can be transmitted to the receiving side having the decoder even during reproduction while maintaining the time interval of the original packet data, thereby enabling decoding without causing a problem.

As shown in Figs. 1 and 2, when packet data is recorded, arrival time information at which the packet data arrives is added to the packet data. This recorded data string is called a SOB (stream object). In fact, a plurality of SOBs are recorded on one recording medium. For example, when a user starts and finishes recording, one SOB is created, and when a user starts and ends recording again, a new SOB is recorded. In this case, the data string refers to the recorded data until the user starts and ends one recording. For example, one drama or one movie may be recorded in the form of one data string.

ATS has an important meaning in an apparatus for recording data in a packet form. Normally, each data string is recorded by adding ATS independently of each other. In addition, this method can be used because continuous reproduction is required only in one data string. However, if the user wants to continuously reproduce between two data strings, additional information is required to define the operation between the data strings.

FIG. 3 is a diagram illustrating an example of reproducing two data strings SOB by the recording / reproducing apparatus shown in FIG. 2, wherein the arrival time value is “100” in the preceding data string SOB1. It is recorded from time to time "990", and in the next data string (succeeding SOB: "SOB2"), the arrival time value is recorded from time "0" again. When the ATS generator 104 records SOB1, the ATS generator 104 initializes and records the first ATS value of the packet data that arrives first. When the ATS generator 104 records the SOB1, the ATS generator 104 returns the ATS of the packet data that arrives first regardless of the SOB1. It means that it is initialized and recorded with the value "0". When two data streams recorded in this manner are reproduced in succession, SOB1 is reproduced while comparing the value of the counter 102 with the ATS value of SOB1, and after the reproduction of SOB1 is finished, the counter 102 is reset to "0" again. And regenerate SOB2.

In the case where two data strings SOB1 and SOB2 recorded in this way are reproduced in succession, an operation is not defined such as how many time intervals exist from the end of the reproduction of SOB1 to the reproduction of SOB2.

That is, when reproducing a single SOB, as shown in FIG. 3, the counter 102 is first initialized with the ATS value of the first packet data of the SOB1, and the packet data thereafter returns the count value of the corresponding ATS and the counter 102. Compare and wait until the values are the same, and then play it by printing. After the reproduction of one SOB1 is completed, the reproduction of SOB2 is initialized again with the ATS value of the packet data for the first time and then reproduced through the same process. At this time, there is no specific rule for the operation between SOB1 and SOB2, so that a slight stop occurs in a normal case.

The number of time intervals between two SOBs for continuous playback depends on the internal data situation and cannot be determined uniformly. Therefore, information on such reproduction time control is necessary in accordance with the situation, and without this, continuous reproduction cannot be guaranteed, and in some cases, a slight time break occurs between SOBs.

4 (a) shows a case where a discontinuous section due to partial deletion occurs when ATS is intentionally added to a plurality of SOBs for continuous reproduction. That is, the ATS of SOB2 is not provided independently of SOB1, but the ATS of SOB2 is intentionally added so that continuous playback is possible depending on the last ATS of SOB1 and the data situation at that time. In the case of reproducing this, continuous playback is ensured automatically while reproducing as if one SOB is reproduced without resetting the counter 102 between two SOBs. In this case, even when playing between two SOBs, the initialization of the counter 102 does not occur as if one SOB is played, and continuous playback is performed in accordance with the ATS. In this case, however, the deletion of a portion which is common in the recording / reproducing apparatus causes a problem that continuous reproduction cannot be easily guaranteed.

For example, considering the case where the front portion of SOB2 is partially deleted, as shown in FIG. 4B, data is not output for the amount of time deleted. This occurs by not initializing the value of the counter between SOB boundaries. This problem can be solved by initializing the count value of the counter 102 to the ATS value of the first packet of SOB2, but this is the same as the method shown in Fig. 3, i.e., the operation for reproducing between SOBs is not defined. Occurs.

Another method is to modify all ATS of SOB2 as shown in (c) of FIG. 4 so as to enable continuous playback. However, this should be recorded by modifying all ATSs in SOB2.

In conclusion, when continuously reproducing two data strings SOB1 and SOB2 independently to which ATS has been added, as shown in FIG. 3, the ATS processor 112 gives an arbitrary time interval after the reproduction of SOB1 ends, and then SOB2. When the counter 102 is initialized with the first ATS value and the reproduction of SOB2 is started, the continuous reproduction is not guaranteed and there is a problem of disconnection of the reproduction.

As shown in Fig. 4A, even if the ATS is generated so that continuous playback can be performed in the ATS generator 104 when recording the next SOB2 after the recording of the previous SOB1 is finished, i.e., the front part of the SOB2 is added. Deleting or deleting the back of SOB1 will disable continuous playback. In order to enable continuous playback by the method illustrated in FIG. 4C, there is a problem in that the ATS of SOB2 must be changed to a different value and rewritten after recording / editing.

In order to solve the above problems, an object of the present invention is to record a plurality of data strings in the form of packet data used in digital satellite, digital terrestrial, digital cable broadcasting or ATM transmission network, etc. in a storage medium such as an optical disk, and then The present invention provides a method of generating additional information for ensuring continuous reproduction between columns.

Another object of the present invention is to provide a recording medium which stores updated information in order to easily ensure continuous reproduction of a plurality of data strings configured in the form of packet data even after editing such as partial deletion. .

A further object of the present invention is to provide a recording apparatus for recording additional information which ensures continuous reproduction of a plurality of data strings configured in the form of packet data during recording.

It is still another object of the present invention to provide an editing apparatus for easily updating additional information that guarantees continuous reproduction of a plurality of data strings configured in the form of packet data during editing such as partial deletion.

It is still another object of the present invention to provide a reproducing apparatus which continuously reproduces even between boundaries of a plurality of data strings configured in the form of packet data by using additional information which guarantees continuous reproduction during reproduction.

It is still another object of the present invention to provide a recording and reproducing apparatus for recording additional information which ensures continuous reproduction of a plurality of data strings configured in the form of packet data, and continuously reproducing between a plurality of data string boundaries based on this information. To provide.

In order to achieve the above objects, the method of generating additional information according to the present invention generates separate data string information for each data string configured in the form of packetized data to which time information of the packet data arrives. And data stream information including continuous playback information indicating whether or not continuous playback with the previous data string and / or continuous time control information for controlling the output time of the corresponding data string to be continuously played is generated.

In the recording medium according to the present invention, a first data having a plurality of data strings configured in the form of packetized data to which time information of the packet data arrives is added, and a separate data string for each data string in the first region. And a second region having data string information having continuous information and information indicating whether or not continuous playback with a previous data string and / or continuous time control information for controlling an output time of a corresponding data string to be continuously played. It is characterized by.

The recording apparatus according to the present invention comprises an arrival time information generator for adding arrival time information to which the input packet data arrives to each packet data, and a packetized data form in which the arrival time information is added to each packet data. A separate data string information is generated for each data string, and the data string includes continuous play information indicating whether the data string is continuously played with the previous data string and / or continuous time control information controlling the output time of the corresponding data string to be continuously played. And a recording controller which controls the data string information generator for generating information and the data string to be recorded in the first area on the recording medium and the data string information in the second area.

The editing apparatus according to the present invention comprises a first data region having a plurality of data strings configured in the form of packetized data to which time information of the packet data arrives, and a separate data string for each data string in the first region. And a second area having data string information having continuous information and information indicating whether or not continuous playback with a previous data string and / or continuous time control information for controlling an output time of a corresponding data string to be continuously played. An editing apparatus for editing data on a recording medium, comprising: analyzing data string information after editing to obtain continuous time control information so as to ensure continuous reproduction by analyzing between data string boundaries that are not continuously reproduced; Data string for updating information The information updater and the edited data string are stored on the recording medium. Claim the first region, the updated data string information, and is characterized in that it comprises an edit controller for controlling to record the second area.

The reproduction apparatus according to the present invention provides a first data region having a plurality of data strings having a plurality of data strings in the form of packetized data to which time information of the packet data arrives, and a separate data string for each data string in the first region. And a second region having data string information having continuous information and information indicating whether or not continuous playback with a previous data string and / or continuous time control information for controlling an output time of a corresponding data string to be continuously played. A reproduction apparatus for reproducing data on a recording medium, comprising: a reproduction controller for reproducing data sequence and data string information recorded on a recording medium, driven according to a system clock signal, and added to the first packet data reproduced by the reproduction controller; A counter reset by the received arrival time information, the data provided from the playback controller A first processor for providing continuous control and providing a control signal indicating when the counter should be reset by modifying the original arrival time information of the corresponding data string to be continuously reproduced based on the column information; When reproducing the data string without resetting the counter, controlling the output by removing the arrival time information added to the packet data provided from the reproducing controller based on the modified arrival time information, and reproducing by resetting the counter. And a second processor for controlling the output by resetting the counter to the arrival time information of the first packet data of the corresponding data string and removing the arrival time information added to the packet data provided from the reproduction controller according to the control signal. I am doing it.

In addition, the recording and reproducing apparatus according to the present invention comprises an arrival time information generator for adding arrival time information to which packet data to be input arrives to the packet data, and a packetized data type in which arrival time information is added to each packet data. Separate data string information is generated for each data string, and includes continuous play information indicating whether the data string is to be continuously played with the previous data string and / or continuous time control information for controlling the output time of the corresponding data string to be continuously played. A data string information generator for generating data string information, a recording controller for controlling each data string to be recorded in a first area on a recording medium, and a data string information to a second area; a data string and data string information recorded on a recording medium. It is driven by the playback controller and system clock signal to play back. A counter that is reset at the time of output and counts and provides a count value to the arrival time information generator, and during playback, a counter that is reset by the arrival time information added to the first packet data to be played by the playback controller, and a data string provided from the playback controller. A first processor for modifying the original arrival time information of the corresponding data stream to be continuously played based on the information and providing a control signal indicating when the counter should be reset to provide the modified arrival time information, and the corresponding to be continuously played. In the case of reproducing the data string without resetting the counter, the output is controlled by removing the arrival time information added to the packet data provided from the reproduction controller based on the modified arrival time information. The first packet of the data string according to the control signal And a second processor which controls the output by removing the arrival time information added to the packet data provided from the reproduction controller after resetting the counter with the arrival time information of the data.

FIG. 1 is a diagram showing a conceptual relationship between a recording form of data recorded with a normal packet data input and arrival time and an output time during reproduction.

FIG. 2 is a block diagram of an apparatus for recording and reproducing packet data shown in FIG.

3 is a view for explaining an example of a conventional reproducing method of two data streams (SOB).

4 is a view for explaining another example of a conventional regeneration method of two or more SOBs.

5 is a diagram illustrating an example of continuous playback between two SOBs when the continuous playback information according to the present invention is " continuous playback ".

6 is a diagram illustrating an example of discontinuous playback between two SOBs when the continuous playback information according to the present invention is "not continuous playback".

7 is an example of a data string information (SOBI) structure according to the present invention.

8 is a block diagram according to an embodiment of a recording / editing apparatus according to the present invention.

9 is a block diagram according to an embodiment of a playback apparatus according to the present invention.

10 is a diagram illustrating an example of obtaining ATS, PCR, and PTS correlations and offsets of MPEG-TS data according to the present invention.

FIG. 11 is a view for explaining the relationship between the reference time, offset value, and playback interval value during continuous playback according to the present invention, and the counter value used for actual output.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of generating additional information for ensuring continuous reproduction between data streams according to the present invention, a recording medium storing the information, and a preferred embodiment of a recording, editing and / or reproducing apparatus will be described. do.

The present invention provides a method for generating additional information that guarantees continuous reproduction while recording a data string including packet data, a recording medium for storing the generated additional information with the data string, a recording device for recording the data string and this additional information, and after editing An editing device for updating this additional information to ensure continuous playback, and a playback device for continuous playback based on this additional information. In the present invention, except for the case where the packet data is not specifically described, the input data string will be described as an MPEG-2 TS (trasnport stream). In addition, since the present invention guarantees an accurate transfer timing between data string boundaries for continuous reproduction, the present invention may be referred to as a seamless transfer for continuous reproduction, and is configured in the form of packetized data. Continuous transmission is a prerequisite for continuous reproduction of heat.

FIG. 5 (a) shows two data strings in the case where the Continuous Info. According to the present invention is " Seamless. &Quot; In the present invention, information about a data string is created and used separately from the data string for continuous reproduction. This is called data string information (SOBI). This data string information SOBI is stored as continuous playback information indicating whether continuous playback is to be performed, and reference time (RT) and / or offset values and / or playback length (GAP length) values used for continuous playback. Continuous time control information is included.

Continuous information indicates whether continuous playback is guaranteed between two data streams SOB1 and SOB2, and as a result, whether continuous time control information (reference time / offset value / reproduction interval value) is used. This continuous playback information may be simply indicated by a flag of 1 bit, or may be implied according to the continuous time control information value without special information. For example, when the continuous time control information values are all "0", it is not continuous playback, and other means continuous playback.

In addition, if continuous playback is possible without continuous time control information, only continuous playback information may be used as a method for indicating whether or not corresponding data streams are currently guaranteed to be continuously played.

In the case where the continuous playback information has a value indicating "continuous playback", the playback method plays back the previous data string SOB1 and then plays back the subsequent data string SOB2, and the playback device controls this continuous time control information (reference time / offset). Value / reproduction interval value) to recognize and reproduce the ATS of SOB2 to a value that is appropriately changed.

At this time, the reference time / offset value / reproduction interval value is a value that causes the ATS time to be continuously continued when SOB1 and SOB2 are continuously played back. The correlation between these three values is as follows.

Offset = RT-ATS of the first packet of SOB2

GAP length = RT-ATS of last packet of SOB1

For example, if the count value of the counter is maintained without resetting after reproducing SOB1, it can be determined using this reference time as a value of when the first packet of SOB2 should be output. Alternatively, the difference between the original ATS value of the first packet of SOB2 and the ATS value to be converted is called an offset, and the offset value may be used to determine when the first packet of SOB2 should be output. However, the offset value may have a positive or negative value. Subsequent packets of SOB2 add the offset value thus obtained and convert the original ATS value into a new ATS value. In the case of resetting the count value of the counter after reproducing SOB1, a reproducing interval value, which is a time interval between the last packet of SOB1 and before the first packet of SOB2 is transmitted, can be used. The three consecutive time control information described above have the same time point in order to transmit the first packet of SOB2.

5B is an example in which the first packet of SOB2 is output at a time of "1000" while maintaining the counting operation without resetting the counter after outputting SOB1.

FIG. 5 (c) shows that the ATS of SOB2 is used after resetting the counter value to the arrival time value of the first packet of SOB2 after the playback interval of 10 has elapsed after 990, the arrival time of the last packet of SOB1. To output it. Both methods allow the SOB2 packet data to be output at the same time.

FIG. 6 is a diagram for describing discontinuous playback of two data strings when the continuous playback information according to the present invention is "not continuous playback". At this time, when the output of SOB1 is terminated and the counter is initialized with the ATS of the first packet of SOB2 and SOB2 is output, the temporary reproduction stop occurs as in the conventional method shown in FIG. At this time, the continuous time control information (reference time / offset value / reproduction interval value) has a meaningless value and is ignored even if the reference time / offset value / reproduction interval value is stored in the continuous time control information during reproduction.

7 is a diagram illustrating an example of a data string information (SOBI) structure according to the present invention. The data string information SOBI, which is the object of the present invention, includes continuous playback information and continuous time control information. The continuous play information is a valid value and has a value indicating "continuous play" or "not continuous play", and the continuous time control information includes a reference time and / or an offset value and / or a play interval value.

The continuous time control information (reference time / offset value / playback interval value) has a valid value only when the continuous play information has a value indicating “continuous play”. That is, the continuous time control information has information for indicating the exact output time of SOB2 that ensures continuous playback at the boundary between SOB1 and SOB2 when SOB2 is continuously played back to SOB1. For example, the counter of SOB1 performs counting operation. When it is kept as it is, it is possible to use the time (reference time) at which the first packet of SOB2 should be output or the difference (offset) between the ATS corresponding to the reference time and the original ATS. Alternatively, a value (playback time interval: GAP length) indicating how long after the output of the last packet of SOB1 to reset the counter to the arrival time of the first packet of SOB2 may be used.

8 is a block diagram according to an embodiment of a recording device or an editing device according to the present invention, in which a controller 202, a counter 204 driven according to a system clock signal, and an ATS for adding arrival time to input packet data are shown. To the recording controller 210 which records on the recording medium 212 the packet data to which the generator 206, the data string information (SOBI) generator 208 and the arrival time information are added, and the SOBI generated by the SOBI generator 208. It is composed. Here, the SOBI generator 208 generates data string information for ensuring continuous reproduction of the data string SOB to which the arrival time information is added and recorded. The SOBI generator 208 may also be implemented in software running on the controller 202.

At the time of recording, the controller 202 sets the counter 204 to an initial value at the start of recording. After that, the packet data is input and the recording operation is started. The ATS generator 206 sets the count value of the counter 204 at the time the incoming packet data arrives as the arrival time information (ATS) of the packet data, and adds the ATS to the packet data. The packet data to which the arrival time information is added is stored in the recording medium 212 via the recording controller 210. In this case, in order to suit the characteristics of the recording medium, other additional information may be added in addition to the packet data and the arrival time information and recorded together with this information.

For example, when the characteristics of the recording medium are required to be managed in units of 2048 bytes (packs), when additional packet data with arrival time information is desired to be recorded in accordance with this characteristic, additional additional data is added and recorded together. . In the present invention, additional data other than the arrival time information is ignored for convenience of explanation.

On the other hand, a plurality of data strings SOB recorded for use in a PC or the like may be combined into one file or may be generated separately from each other.

The SOBI generator 208 generates data string information including continuous reproduction information and continuous time control information having a reference time and / or an offset value and / or a reproduction interval value as shown in FIG. At the end of the recording, under the control of the controller 202, the packet data string recording to which the ATS is added is terminated, and the data string information SOBI generated by the SOBI generator 208 is recorded on the recording medium 212. Here, an area in which the data string is recorded may be referred to as a first region, and an area in which data string information is recorded may be referred to as a second region.

Therefore, during recording, the SOBI generator 208 generates data string information SOBI and records it along with the data string on the recording medium. After the recording is completed, the editing apparatus can be used to perform the editing process and modify the data string information SOBI for ensuring continuous reproduction. The editing apparatus used here has the same structure as the recording apparatus. However, the SOBI generator 208 may be referred to as a data string information updater and the recording controller 210 as an editing controller.

Fig. 9 is a block diagram according to an embodiment of the reproduction apparatus according to the present invention, which reads data strings and data string information from the controller 302, the counter 304 driven by the system clock signal, and the recording medium 306. Figs. A SOBI that reads the data stream information from the playback controller 308 and the playback controller 308 to determine the ATS value of the first packet of the next SOB or to control the reset point of the counter 304 to enable continuous playback at the data stream boundary. It is composed of a processor 310 and an ATS processor 312. Here, the SOBI processor 310 and the ATS processor 312 may be referred to as first and second processors, respectively, where the SOBI processor 310 may be implemented by software running on the controller 302.

During playback, the SOBs recorded on the recording medium are read in order. The packet data added with the arrival time information (ATS) thus read is provided to the ATS processor 312, and the ATS processor 312 sets the counter 304 as an initial value as the arrival time information of the packet data input first. Simultaneously outputs packet data. Thereafter, the arrival time information of the packet data to be inputted is compared with the count value of the counter 304, and the packet data is waited for when the count value is the same as the arrival time information of the packet data. .

When all of the outputs of one SOB are terminated, the SOBI processor 310 reads the SOBI of the next SOB, and if the value indicating "continuous playback" is set using the continuous playback information and the continuous time control information, the next SOB as described in FIG. The time point at which the first packet data should be output or the time point at which the counter 304 is reset is determined using the continuous time control information and provided to the controller 302 and the ATS processor 312, and "not continuous playback." If the value indicated is set, the continuous time control information is ignored as described in FIG. At this time, the controller 302 controls the first packet data of the next SOB to be output at a time determined from the continuous time control information as described above while resetting or maintaining the counter 304 at a specific time.

Fig. 10 shows a process of accurately deriving continuous time control information (reference time) in an MPEG-TS, MPEG-1 or MPEG-2 coded data sequence. FIG. 10A shows the types of programs recorded in the recording / playback apparatus in units of ATS and packets. The MPEG-TS structure has a PCR (Program Clock Reference) value and a PTS (Presentation Time Stamp) value in the packet. The PCR value represents the counter value at the moment when the packet is inputted into the buffer of the receiver having the decoder, and is basically the same value as the ATS. The difference is that PCR is a value inside the packet data, and not all packets have PCR, whereas ATS is a value added outside the packet data and is usually added to all packet data.

Since both ATS and PCR shown in FIGS. 10B and 10C are information indicating arrival times, if the clock used to generate the ATS value is synchronized with the MPEG-TS encoded data, it is possible to use the ATS and the PCR. It maintains a certain time interval delta and one-to-one correspondence. The PTS value shown in (d) of FIG. 10 is also a value used in MPEG-TS encoded data, for example, at which time an image should be expressed. In general, a plurality of packet data are gathered to represent a single image, and the PTS of the image is written in a packet including the start of the image data, and usually has a value after the PCR of the packet.

For example, in order to obtain continuous time control information that guarantees continuous playback between two SOBs, it is necessary to first define the meaning of continuous playback. In the case of playing MPEG video data, the first picture P2 of SOB2 should follow immediately after the last picture P1 of SOB1. Therefore, the image of P2 should be output immediately after the image of P1. By adding a frame duration of the P1 picture to the PTS of the P1 picture, a new PTS of the P2 picture can be obtained. Also, if the difference between the PTS of the P2 image and the PCR of the first packet of the SOB2 is delta (DELTA), the method of outputting the P2 image immediately after the P1 image is that the new PCR value of the P2 image is equal to the DELTA time before the new PTS. The interval of is guaranteed to reach the receiving buffer. In this way, a new PCR value (“4000” in the drawing) of the P2 image can be obtained.

On the other hand, since the PCR value and the ATS value in the SOB1 data string correspond to one-to-one correspondence by maintaining the delta value, a new ATS value (ATS value of the first packet of SOB2) can be obtained from the new PCR of the P2 image. . This new ATS value is a value at which the first packet data of SOB2 should be output when the counting operation of the counter 304 is continued after the last packet data of SOB1 is output in order to continuously output the P2 image. . The offset value can be obtained as the difference between the reference time and the ATS value of the first packet of SOB2. The reproduction interval value is a difference between the reference time and the ATS value of the last packet of SOB1. If only one of the three values is needed, the remaining values can be inferred.

In FIG. 10, the simplest method of obtaining an offset value is illustrated. In practice, it is sometimes necessary to go through the re-encoding process, taking into account not only the time relationship but also the buffer situation. When data string information is recorded so that two or more SOBs are continuously reproduced. If the counter reset is not used, after the first SOB is regenerated, the counter 304 continues counting operation and continues the offset value in the SOBI. When used in addition to the original ATS value of the SOB, continuous playback between the two SOBs is guaranteed. In the case of using the counter reset, the reset is performed using the reproduction interval value for each SOB.

FIG. 11 is a view for explaining a correlation between reference time / offset value / playback interval value for better understanding of the present invention, in which a column direction represents a file space of a data string and a row direction represents an ATS added to packet data. have. Moreover, the counter value change with and without a counter reset was also illustrated.

In FIG. 11, after transmitting SOB1, the SOB2 is transmitted by adding an offset (offset = 1005-10 = 995 in the drawing) to the original ATS without resetting the counter, or reproducing interval (GAP in the drawing) in the ATS of the last packet of SOB1. length = 1005-1000 = 5) SOB2 can be sent by resetting the counter to the ATS of the first packet of SOB2 at a reference time away.

8 and 9, the recording / editing apparatus and the reproducing apparatus are separately configured. However, the present invention has all the configurations shown in FIGS. 8 and 9, and includes a counter driven by a system clock. The controller can also be applied to a recording / playback apparatus that can be configured to share.

The present invention can continuously reproduce data streams without disconnection using data string information including continuous playback information and / or continuous time control information (reference time and / or offset value and / or reproduction interval value). In particular, the information structure according to the present invention has the effect that even in the case where the data string is edited, continuous playback can be performed simply by correcting the data string information without directly rewriting or modifying the arrival time information ATS added to the packet data.

Claims (7)

A first region having a plurality of data strings configured in the form of packetized data to which time information of arrival of the packet data is added; And Continuous time having separate data string information for each data string in the first region and controlling continuous playback information indicating whether to continuously play with the previous data string and / or output time of the corresponding data string to be continuously played. A recording medium comprising a second area having data string information including control information. The recording medium of claim 1, wherein the continuous time control information includes reference time and / or offset information and / or reproduction interval information. 3. The recording medium of claim 2, wherein the reference time is a value representing an output time of the first packet data of the corresponding data string to be continuously reproduced in terms of the arrival time value of the packet data constituting the previous data string. . 3. The method of claim 2, wherein the offset information is a difference value between the output time of the first packet data of the corresponding data string and the original arrival time of the corresponding data string to be continuously reproduced as the arrival time value of the packet data constituting the previous data string. And a recording medium. 3. The recording medium of claim 2, wherein the reproduction interval information is a value indicating how long the first packet of the corresponding data string should be output after a time interval after the output time of the last packet of the previous data string. The recording medium of claim 1, wherein the continuous time control information has a value that is valid only when the continuous playback information has a value meaning "continuous playback". 2. The recording medium of claim 1, wherein the data string on the first area is composed of packs of packet data appended with a predetermined number of arrival time information and additional headers appended thereto.