WO2004086397A1 - Procede et appareil pour garantir la reproduction sans interruption d'une pluralite de trains de donnees - Google Patents

Procede et appareil pour garantir la reproduction sans interruption d'une pluralite de trains de donnees Download PDF

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Publication number
WO2004086397A1
WO2004086397A1 PCT/KR2004/000706 KR2004000706W WO2004086397A1 WO 2004086397 A1 WO2004086397 A1 WO 2004086397A1 KR 2004000706 W KR2004000706 W KR 2004000706W WO 2004086397 A1 WO2004086397 A1 WO 2004086397A1
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WO
WIPO (PCT)
Prior art keywords
value
packet data
reproduction
arrival time
data stream
Prior art date
Application number
PCT/KR2004/000706
Other languages
English (en)
Inventor
Kil-Soo Jung
Seong-Jin Moon
Original Assignee
Samsung Electronics Co. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040016101A external-priority patent/KR101014664B1/ko
Application filed by Samsung Electronics Co. Ltd. filed Critical Samsung Electronics Co. Ltd.
Priority to JP2006507779A priority Critical patent/JP2006524952A/ja
Publication of WO2004086397A1 publication Critical patent/WO2004086397A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
    • G11B2020/10944—Real-time recording or reproducing, e.g. for ensuring seamless playback of AV data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1288—Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs

Definitions

  • the present invention relates to reproduction of multimedia data, and more particularly, to a method and apparatus for guaranteeing seamless reproduction of a plurality of data streams.
  • multimedia data is compressed and encoded according to a moving picture experts group (MPEG) standard and then recorded on a storage medium.
  • the compressed and encoded data is divided into predetermined-sized packets and recorded on the storage medium.
  • Multimedia data such as video and/or audio (AV) data, which is compressed, encoded, and divided into predetermined-sized packets, will be referred to herein as 'packet data'.
  • Packet data may be recorded on a storage medium or transmitted via a satellite, a cable, or a local area network (LAN).
  • a size of packet data is determined according to the moving picture experts group standard used. For instance, a size of packet data is determined to be 188 bytes long when using MPEG-2 transport streams according to an ISO/IEC 13818-1 standard, and determined to be 53 bytes long when using the asynchronous transfer mode (ATM) standard.
  • ATM asynchronous transfer mode
  • FIG. 1 illustrates a basic format of packet data recorded to include arrival time stamps (ATSs), and a relationship between the ATSs and output time when the packet data is reproduced.
  • ATSs arrival time stamps
  • a recording apparatus adds ATSs (e.g., 100, 110, 130 and 150) to input packet data and records the packet data including the ATSs on a storage medium.
  • the ATSs indicate when packet data is input to the recording apparatus.
  • a reproducing apparatus reads the packet data including the ATSs from the storage medium and controls output time of the packet data based on the ATSs.
  • multimedia data is transmitted in a packet format at irregular intervals of time.
  • the transmitted packet data is sent to a decoder via a buffer at a receiving side and decoded by the decoder so that a user can view a result of the digital broadcasting.
  • the reproducing apparatus when recording packet data on a storage medium and reproducing the packet data from the storage medium at a desired point of time, the reproducing apparatus reads the packet data from the storage medium and outputs the packet data to the decoder.
  • irregular intervals of time at which the original packet data was transmitted to the recording apparatus are significant.
  • the irregular intervals of time were determined by a transmitting side so that intervals between packet data that are to be decoded are appropriate and do not cause overflow or underflow of the buffer at a receiving side. If the receiving side does not decode the packet data based on the irregular intervals of time, seamless reproduction of multiple data is not ensured due to overflow or underflow of the buffer at the receiving side. That is, seamless reproduction of multimedia stream data is not guaranteed. Therefore, a recording apparatus records input packet data together with respective ATSs and a reproducing apparatus controls reproduction of the packet data based on the recorded ATSs.
  • FIG. 2 is a block diagram of a conventional recording/reproducing apparatus that records and/or reproduces the packet data of FIG. 1.
  • the recording apparatus includes a counter, an ATS generator, and a recording controller
  • the reproducing apparatus includes a reproduction controller, a counter, and an ATS processor.
  • the counters of the recording apparatus and the reproducing apparatus operate in response to a system clock signal.
  • the counters basically use a 27 MHz clock signal since a system generates time stamps in response to the 27 MHz clock signal.
  • system clock signals with different frequencies may be used.
  • the ATS generator adds a respective ATS to each packet data input to the recording apparatus.
  • the recording controller converts the packet data with the ATSs into a recordable signal and records the recordable signal on a storage medium.
  • the reproduction controller of the reproducing apparatus reads back the packet data with the ATSs from the storage medium and transmits the read data to the ATS processor.
  • the ATS processor outputs the packet data based on the ATSs added to the packet data.
  • Each of the ATS generator and the ATS processor includes a buffer (not shown) that temporarily stores the packet data with the ATSs. Such a buffer may be installed outside each of the ATS generator and the ATS processor.
  • the ATS generator reads a counter value of the counter when the packet data is input to the recording apparatus and adds the read counter value to the related packet data. That is, the counter value read when the packet data is input to the recording apparatus is added as an ATS to the packet data.
  • the packet data with the ATS is temporarily stored in the buffer installed in the ATS generator and recorded on the storage medium using the recording controller.
  • the buffer may be installed outside the ATS generator.
  • the reproduction controller of the reproducing apparatus reads the packet data with the ATSs from the storage medium and transmits the read packet data to the ATS processor.
  • the ATS processor which includes a predetermined sized buffer therein, temporarily stops reading of the packet data when the buffer overflows and restarts reading of the packet data when the buffer is empty. Also, the ATS processor reads the packet data, which is first transmitted to the ATS processor buffer, and the ATS from the packet data, and outputs the packet data while resetting the counter with the ATS.
  • the packet data output from the ATS processor is the original packet data that does not include the ATS.
  • the ATS processor compares the respective ATSs of the subsequent packet data with the counter value and outputs only packet data whose ATS is equivalent to the counter value.
  • the buffer may be installed outside the ATS processor.
  • Inclusion of ATSs into packet data allows reproduction of the packet data based on intervals of time at which the original packet data was transmitted by a transmitting side to a receiving side. Accordingly, seamless reproduction of a plurality of packet data of a data stream without causing overflow or underflow of the buffer is possible.
  • a data stream which contains packet data recorded to include ATSs as described with reference to FIGS. 1 and 2, is referred to as a Stream OBject (SOB).
  • SOB Stream OBject
  • seamless reproduction of packet data contained in an SOB may be seamlessly reproduced, based on the ATSs included in the packet data.
  • a data stream refers to data recorded during which a write operation starts and ends.
  • a drama or a movie may be recorded in a data stream format.
  • ATSs of a data stream are recorded independently with (or to be unrelated with) those of another data stream.
  • a pause between reproductions of the two data streams is unavoidable since there are no particular regulations for continuous reproduction of two data streams.
  • FIG. 3 illustrates reproduction of two SOBs SOB1 and SOB2 using the conventional recording/reproducing apparatus of FIG. 2.
  • ATSs of packet data of a first SOB SOB1 are recorded starting from 100 to 990
  • ATSs of packet data of a second SOB SOB2 are recorded starting from 0.
  • the ATS generator of FIG. 2 sets an ATS 100 of first incoming packet data of the first SOB SOB1 as an initial counter value of the counter of FIG. 2 when recording the first SOB SOB1, but resets the initial counter value as an ATS 0 of first incoming packet data of the second SOB SOB2 when recording the second SOB SOB2.
  • the first SOB SOB1 is reproduced while comparing the corresponding ATSs with counter values.
  • the counter value is reset as 0 and reproduction of the second SOB SOB2 starts.
  • the conventional recording/reproducing apparatus of FIG. 2 when reproducing the two SOBs SOB1 and SOB2 whose ATSs are determined to be unrelated to one another, the conventional recording/reproducing apparatus of FIG. 2 resets an initial counter value to an ATS of the first incoming packet data of the second SOB SOB2 an undetermined interval of time after reproduction of the first SOB SOB1, and starts reproduction of the second SOB SOB2, thus causing a pause in the reproduction.
  • seamless reproduction of the first and second SOBs SOB1 and SOB2 is not guaranteed.
  • the present invention provides a method of and an apparatus for guaranteeing seamless reproduction of a plurality of data streams.
  • a method of seamlessly reproducing a plurality of data streams that include packet data with arrival time stamps determined to be unrelated to each other comprising generating control information for controlling output times of the plurality of data streams for seamless reproduction, and continuously reproducing the plurality of data streams based on the generated control information.
  • the control information may specify a reference time value and one of a reproduction gap length value and an offset value.
  • the reference time value may be obtained by adjusting an arrival time stamp of first packet data of a current data stream so that the current data stream is reproducible immediately after reproduction of a previous data stream without a pause.
  • the reproduction gap value may be a time value indicating an interval of time between reproduction of last packet data of the previous data stream and the first packet data of the current data stream, and the reproduction gap value may be obtained by calculating the difference between the reference time value and an arrival time stamp value of last packet data of the previous data stream.
  • the offset value may be added to the arrival time stamp value of each packet data of the current data stream so that the current data stream is reproducible immediately after reproduction of the previous data stream without a pause.
  • the offset value may be obtained by calculating a difference between the reference time value and the arrival time stamp value of the first packet data of the current data stream.
  • an apparatus for seamlessly reproducing a plurality of data streams that include packet data with arrival time stamps determined to be unrelated to each other comprising a reproduction controller which reads the plurality of data streams from a storage medium, a counter which is driven in response to a system clock signal and reset based on the arrival time stamp of first packet data of each of the plurality of data streams read by the reproduction controller, an arrival time stamp processor which removes the arrival time stamps from the packet data of the plurality of data streams and outputs only the packet data, and a controller which generates control information for controlling output time of the respective packet data for seamless reproduction of the plurality of data streams, and controls operation of the counter or the arrival time stamp processor based on the control information.
  • the control information may specify a reference time value and one of a reproduction gap length value and an offset value.
  • the controller may transmit a control signal indicating when the counter must be reset, to the counter for seamless reproduction of the plurality of data streams, the control signal being obtained by combining an arrival time stamp of last packet data of the previous data stream and the reproduction gap value.
  • the controller may change an arrival time stamp value of first packet data of the current data stream into the reference time value, change arrival time stamp values of the remaining packet data by adding the offset value to the arrival time stamp values, and provide the changed arrival time stamp values to the arrival time stamp processor.
  • FIG. 1 is a conceptual view illustrating a basic format of packet data with ATSs, and a relationship between the ATSs and output time of the packet data;
  • FIG. 2 is a block diagram of a conventional recording/reproducing apparatus that records and reproduces the packet data shown in FIG. 1 ;
  • FIG. 3 illustrates reproduction of two Stream OBjects (SOBs) using the conventional recording/reproducing apparatus of FIG. 2;
  • FIG. 4 is a block diagram of a reproducing apparatus capable of seamlessly reproducing a plurality of SOBs, according to an embodiment of the present invention
  • FIGS. 5A through 5D illustrate a process of precisely calculating a reference time value for seamless reproduction of a plurality of SOBs encoded according to an MPEG standard, according to an embodiment of the present invention
  • FIG. 6 is a timing chart illustrating a method of calculating the reference time value illustrated in FIGS. 5A through 5D, using equations;
  • FIG. 7 illustrates a method of calculating a reproduction gap value for resetting a counter and an offset value for adjusting data output time, using the reference time illustrated by FIG. 6, according to an embodiment of the present invention
  • FIG. 8 is a flowchart illustrating a method of controlling output time of the second SOB after resetting a counter so that the second SOB may be reproduced immediately after reproduction of the first SOB, according to an embodiment of the present invention
  • FIG. 9 is a flowchart illustrating a method of controlling output time of a second
  • FIG. 4 is a block diagram of a reproducing apparatus for seamlessly reproducing a plurality of SOBs, according to an embodiment of the present invention.
  • the reproducing apparatus of FIG.4 comprises a reproduction controller 410, a controller 420, a counter 430, and an arrival time stamp (ATS) processor 440.
  • ATS arrival time stamp
  • the reproduction controller 410 sequentially reads a plurality of SOBs from a storage medium 400.
  • the ATS processor 440 resets the counter 430 based on an ATS of first incoming packet data and at the same time, outputs the first incoming packet data to a decoder (not shown).
  • the ATS processor 440 compares ATSs of subsequent packet data with counter values of the counter and outputs only packet data whose ATSs are equivalent to the counter values.
  • the controller 420 After outputting all packet data of the first SOB SOB1, the controller 420 calculates a time when first packet data of a second SOB SOB2 is to be output and when the counter 430 must be reset, and provides results of the calculating to the ATS processor 440 and the counter 430, respectively. Equations used to calculate the instants of time are described below. In other words, for seamless reproduction of a plurality of SOBs, the controller 420 either adjusts ATSs of the second SOB SOB2 and informs the ATS processor 440 of the adjusted ATSs, or determines when the counter 430 must be reset and transmits a control signal indicating a result of the determination to the counter 430.
  • the counter 430 operates in response to a system clock and is reset according to an ATS of a first incoming packet data of an SOB read by the reproduction controller 410.
  • the counter 430 is reset in response to the control signal that is input from the controller 420 and instructs when the counter 430 must be reset.
  • the reproducing apparatus of FIG. 4 reproduces a current SOB after reproduction of a previous SOB, in response to the control signal input from the controller 420 that instructs when the counter 430 must be reset, thereby guaranteeing seamless reproduction.
  • the ATS processor 440 receives the adjusted ATSs from the controller 420 and controls output times of packet data of a subsequent SOB based on the adjusted ATSs. Otherwise, the ATS processor 440 resets the counter 430 in response to the control signal instructing when the counter 430 must be reset from the controller 420, and controls output times of packet data of a subsequent SOB.
  • one of the following methods (1 ) and (2) is used to seamlessly reproduce a plurality of SOBs.
  • the counter 430 is reset in response to a control signal input from the controller 420 that instructs when the counter 430 must be reset, and then, a current SOB is reproduced after reproduction of a previous SOB by controlling output time of packet data of the current SOB.
  • FIG. 5 is a reference diagram illustrating a method of calculating a reference time value for guaranteeing seamless reproduction of a plurality of SOBs encoded according to the MPEG standards.
  • FIG. 5A illustrates two SOBs SOB1 and SOB2 that are to be reproduced. Packet data of the first SOB SOB1 are given ATSs numbered starting from 100 to 990, and packet data of the second SOB SOB2 are given ATSs numbered starting from 10 regardless of the ATSs of the packet data of the first SOB SOB1.
  • ATSs of packet data shown in FIG. 5B are based on a clock value of an arrival time clock (ATC) used to generate the ATS.
  • ATC arrival time clock
  • the ATS processor 440 of FIG. 4 removes ATSs from the packet data and outputs only the packet data to a decoder.
  • FIG. 5B illustrates output time of the packet data using ATC-based time values.
  • a receiving side must decode packet data in synchronization with a system clock that a transmitting side uses to encode the packet data.
  • Program clock reference (PCR) values shown in FIG. 5C use system time clock (STC)-based time values.
  • STC system time clock
  • ATS values of an SOB correspond to PCR values at predetermined intervals ⁇ oi time.
  • ATS values of the first SOB SOB1 correspond to PCR values at a predetermined interval ⁇ i of time
  • ATS values of the second SOB SOB2 correspond to PCR values at a predetermined interval ⁇ ⁇ of time.
  • FIG. 5D illustrates presentation time stamps (PTSs) of data encoded according to an MPEG-transport stream (MPEG-TS) standard.
  • the PTS indicates an amount of time required to present an image on a screen.
  • an image comprises a plurality of packet data and the plurality of packet data are referred to as a packetized elementary stream (PES).
  • PES packetized elementary stream
  • a PTS is contained in a start of the PES.
  • a PTS of packet data is determined to be larger than a PCR value of the packet data.
  • a first image P2 of the second SOB SOB2 must be presented immediately after a last image P1 of the first SOB SOB1 without a pause.
  • the image P2 must be reproduced immediately after the reproduced image P1; that is, the PTS of the image P2 must be changed to the PTS of an image P2A.
  • a PTS of the image P2A is computed by combining a PTS 3995 of the image P1 with a frame duration value of 110 of the image P1. In this case, the PTS of the image P2A is 4105.
  • the difference value between the PTS value and PCR value of the image P2 is ⁇ .
  • the difference value ⁇ between a PTS value of 2105 of the image P2 and a PCR value of 2000 of first packet data of the second SOB SOB2 is 105.
  • a PCR value of the image P2A must be smaller than the PTS of the image P2A by the difference value ⁇ . That is, a new PCR value of the image P2A is computed by subtracting the difference value ⁇ of 105 from the PTS value of 4105 of the image P2A. In this case, the new PCR value of the image P2A is 4000.
  • difference values between the corresponding PCR values and ATSs of the first SOB SOB1 are ⁇ 1, i.e., 3000. Accordingly, when subtracting the difference value ⁇ 1 from the PCR value of 4000 of the image P2A, an ATS of the image P2A is 1000.
  • the ATS 1000 of the image P2A denotes a time value indicating when first packet data of the second SOB SOS2 must be reproduced after reproduction of last packet data of the first SOB SOB1.
  • the ATS of the image P2A will be referred to as a reference time value.
  • FIG. 6 is a timing chart illustrating a method of calculating the reference time value illustrated by FIG. 5, using equations.
  • L_STC1 denotes a time axis along a line connecting the STCs of the first SOB SOB
  • L__STC2 denotes a time axis along a line connecting the STCs of the second SOB SOB2.
  • the time axis L_STC2 is converted into a time axis L_STC1 extended from the time axis STC1 by compensating for the difference STC_delta between the time axes L_STC1 and L_STC2.
  • this conversion may be expressed by the following:
  • L _STC2 L_ STCl - STC_ delt ⁇ ... (1 ), wherein L_STC1 denotes a long STC obtained from the STCs of the first SOB SOB1, LJSTC2 denotes a long STC obtained from the STCs of the second SOB SOB2, and STC_delta denotes the difference between the STCs L_STC1 and L_STC2.
  • the difference value ⁇ between corresponding ATSs and PCR values of an SOB is caused by the difference between generations of an ATC clock and an STC clock.
  • the difference value ⁇ is referred to as ATC_STC_delta.
  • ATC_STC_delta1 ⁇ .
  • ATC_STC_delta2 ⁇ 2
  • the long STC L_STC1 and the long STC L_STC2 may be expressed as ATC1+ATC_STC_delta1 and ATC2+ATC_STC_delta2, respectively.
  • Equation (1 ) may be expressed as follows:
  • ATC2 + ATC _ STC _ delt ⁇ 2 L_ ATCl + ATC _ STC _ delt ⁇ l - STC _ delta ... (2),
  • a reference time value is determined by an ATC L_ATC2 obtained from ATCs of the second SOB SOB2 in a long ATC L__ATC1 of the first packet data of the second SOB SOB2.
  • the reference time value is illustrated by T2 in FIG. 6 and can be expressed as T2_L_ATC1.
  • the reference time value T2_L_ATC1 is calculated by the following:
  • T2 _ ATCl + ATC _ STC __ delta! T2 _L_ ATCl + ATC _ STC _ delta! - STC _ delta )
  • T2_L _ ATCl T2_ ATC2 + ATC _ STC _ deltal + STC _ delta - ATC _ STC _ delta ⁇
  • FIG. 7 illustrates a method of calculating a reproduction gap value for resetting a counter and an offset value for adjusting data output time, using the reference time T2_L_ATC1 described with reference to FIG. 6, according to an embodiment of the present invention.
  • the reproduction gap value gap length denotes a period of pause in reproduction of two SOBs SOB1 and SOB2, i.e., the difference between the reference time T2_L_ATC1 and the ATS of the last packet data of the first SOB SOB1.
  • the reproduction gap value gap length is used in the method (1) described with reference to FIG. 4, i.e., when the controller 420 resets the counter 430. Referring to FIG.
  • the counter 430 is reset to the ATS of first packet data of the second SOB SOB2 and reproduction of the second SOB SOB2 starts, after time corresponding to the reproduction gap value gap length has lapse starting from time corresponding to the ATS of the last packet data of the first SOB SOB1. Accordingly, a time when the counter 430 must be reset may be determined using the reproduction gap value gap length, thereby ensuring seamless reproduction of a plurality of SOBs.
  • an offset value offset denotes a difference value between the reference time T2_ L_ATC1 and the ATS of the first packet data of the second SOB SOB2.
  • the offset value offset is used in the method (2) described with reference to FIG. 4, i.e., when the second SOB SOB2 is reproduced after reproduction of the first SOB SOB1 without resetting the counter 430.
  • new ATSs of the second SOB SOB2 are obtained by adding the offset value offset to the original ATSs and reproduction of the second SOB SOB2 begins based on the new ATSs without resetting the counter 430. Accordingly, an effect of reproducing the first and second SOBs SOB1 and SOB2 in response to the same ATC may be drawn, thereby guaranteeing seamless reproduction.
  • FIG. 8 is a flowchart illustrating the method (1) described with reference to FIG. 4, that is, a method of controlling output time of a second SOB SOB2 after resetting a counter so that the second SOB may be reproduced immediately after reproduction of a first SOB SOB1, according to an embodiment of the present invention.
  • the first and second SOBs SOB1 and SOB2 which include packet data with ATSs, are read from a storage medium, the ATSs of the packet data of the first SOB SOB1 being determined to be unrelated to those of the packet data of the second SOB SOB2 ( operation 810).
  • a reference time value used to adjust the ATS of first packet data of the second SOB SOB2 is calculated to a new ATS so that the second SOB SOB2 is reproducible immediately after reproduction of the first SOB SOB1 without a pause ( operation 820).
  • the counter is reset using a reproduction gap value that is a difference value between the calculated reference time value and an ATS of last packet data of the first SOB SOB1 ( operation 830).
  • FIG. 9 is a flowchart illustrating the method (2) described with reference to FIG. 4, that is, a method of controlling output time of a second SOB SOB2 so that the second SOB SOB2 is reproduced immediately after reproduction of a first SOB SOB1 without resetting a counter, according to an embodiment of the present invention.
  • operations 910 and 920 are the same as operations 810 and 820 of FIG. 8, and therefore, a description thereof will be omitted.
  • ATSs of packet data of the second SOB SOB2 are adjusted using an offset value between a calculated reference time value and an ATS of first packet data of the second SOB SOB2 ( operation 930).
  • reproduction of the second SOB SOB2 starts based on the adjusted ATSs ( operation 940).
  • a plurality of SOBs may be seamlessly reproduced using the method (1 ) of FIG. 8 or the method (2) of FIG. 9.
  • a combination of the method (1 ) of FIG. 8 and the method (2) of FIG. 9 may be used to seamlessly reproduce the plurality of SOBs.
  • the present invention may be embodied as computer readable code on a computer readable medium.
  • the computer readable medium is any data storage device that can store data that can thereafter be read by a computer system. Examples of the computer readable medium include read-only memory, random-access memory, CD-ROMs, magnetic tape, floppy discs, and optical data storage devices.
  • the computer readable medium may be a carrier wave that transmits data via the Internet.
  • the computer readable medium may also be distributed over a network coupled computer system so that the computer readable code is stored and executed in a distributed fashion.
  • a plurality of SOBs, ATSs of packet data of which are determined to be unrelated to each another may be seamlessly reproduced by adjusting the ATSs of packet data of subsequent SOBs using a reference time value.

Abstract

L'invention concerne un procédé et un appareil pour garantir la reproduction sans interruption de trains de données. Ledit procédé concerne la reproduction sans interruption de plusieurs trains de données comprenant des données en paquets comportant des estampilles d'arrivée déterminées indépendamment les unes des autres. Ledit procédé consiste à générer des informations de commande pour commander les heure de sortie de la pluralité de trains de données pour une reproduction sans interruption, et à reproduire en continu la pluralité de trains de données en fonction des informations de commande générées. Les informations de commande peuvent spécifier notamment une valeur temporelle de référence et une valeur de longueur d'intervalle de reproduction ou une valeur de décalage. Ainsi, plusieurs estampilles d'arrivée ATS et objets de trains SOB de données en paquet déterminées comme sans lien les unes avec les autres peuvent être reproduites sans interruption par ajustement des TAS des données en paquet des SOB suivants au moyen de la valeur temporelle de référence.
PCT/KR2004/000706 2003-03-28 2004-03-27 Procede et appareil pour garantir la reproduction sans interruption d'une pluralite de trains de donnees WO2004086397A1 (fr)

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KR1020040016101A KR101014664B1 (ko) 2003-03-28 2004-03-10 복수의 데이터 스트림 간의 연속 재생을 보장하는 재생방법 및 그 재생 장치
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EP1014370A2 (fr) * 1998-12-16 2000-06-28 Samsung Electronics Co., Ltd. Méthode, support d'enregistrement, et appareil d'enregistrement, de montage, d'enregistrement et de reproduction permettant la lecture continue
KR20010017613A (ko) * 1999-08-12 2001-03-05 구자홍 고밀도 디스크 기록매체의 데이터 기록 및 전송방법
US20020057889A1 (en) * 1999-03-17 2002-05-16 Hideo Ando Recording method of stream data and data structure thereof
US20030058948A1 (en) * 2000-01-10 2003-03-27 Kelly Declan Patrick Method of setting a system time clock at the start of an mpeg sequence

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JP4783987B2 (ja) * 2000-04-24 2011-09-28 ソニー株式会社 情報端末装置及び情報端末受信方法、ディジタル放送受信装置及び方法、並びに、出力時間演算装置及び方法

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KR960019249A (ko) * 1994-11-14 1996-06-17 이데이 노부유키 데이터를 전송, 기록 및 재생하는 방법 및 장치
EP1014370A2 (fr) * 1998-12-16 2000-06-28 Samsung Electronics Co., Ltd. Méthode, support d'enregistrement, et appareil d'enregistrement, de montage, d'enregistrement et de reproduction permettant la lecture continue
US20020057889A1 (en) * 1999-03-17 2002-05-16 Hideo Ando Recording method of stream data and data structure thereof
KR20010017613A (ko) * 1999-08-12 2001-03-05 구자홍 고밀도 디스크 기록매체의 데이터 기록 및 전송방법
US20030058948A1 (en) * 2000-01-10 2003-03-27 Kelly Declan Patrick Method of setting a system time clock at the start of an mpeg sequence

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