JP2004312520A - Data processing device, and computer program executable in the data processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform special reproduction without holding the information of a picture position necessary for the special reproduction on a recording medium. <P>SOLUTION: A data processing apparatus receives the data stream read from the recording medium, and packetized in a plurality of packets. The data stream includes a picture header and picture data. The picture data express the picture, and the picture header specifies the position of the picture data in the data stream. A detection part detects the picture header from the data stream, and creates a packet specification information which specifies a packet including the picture header. A control part specifies a packet for special reproduction including the picture header based on the packet specification information, specifies one or more positions of packets for special reproduction based on the picture header, and creates the data stream for special reproduction from one or more packets for special reproduction. By this means, the data stream for special reproduction can be created. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for extracting necessary picture data from an MPEG transport stream recorded on a recording medium such as a hard disk, a DVD (Digital Versatile Disc) medium, a BD (Blu-ray Disc) medium, and performing special reproduction in real time.
[0002]
[Prior art]
Conventionally, various techniques useful for specially reproducing an MPEG transport stream recorded on a recording medium have been known. Here, “special playback” refers to playback at a speed different from the normal speed, and includes, for example, fast-forward playback, rewind playback, and slow playback of video.
[0003]
For example, conventionally, when recording an MPEG transport stream on a hard disk, a recording device creates picture position information for specifying a picture position in the MPEG transport stream, and records it on the hard disk separately from the MPEG transport stream. Was. The purpose of recording the picture position information separately from the MPEG transport stream is that the position at which the MPEG transport stream is read during trick play can be easily specified based on the picture position detection information. For example, the image processing apparatus described in Patent Document 1 first records picture position information on a hard disk when recording a stream. The image processing apparatus extracts picture data of an MPEG transport stream from an arbitrary position to an arbitrary position using the picture position information, and uses the picture data for trick play.
[0004]
In connection with the trick play, a technique for reducing noise of an image during the trick play is also known. For example, Patent Literature 2 discloses a technique for reducing the generation of noise during special reproduction. The data distribution device described in this document reads data recorded on a recording medium and decodes the read data. Then, only necessary pictures are extracted based on the position information, and special reproduction data is created. After that, the data distribution device encodes the decoded special reproduction data and converts it into an MPEG transport stream packet. Thereby, noise can be suppressed.
[0005]
[Patent Document 1]
JP 2001-285792 A
[Patent Document 2]
JP 2001-359071 A
[0006]
[Problems to be solved by the invention]
According to the conventional technology, the capacity of the recording medium cannot be utilized to the maximum. The reason is that picture position information must be recorded on a recording medium separately from the MPEG transport stream. Furthermore, it is difficult to apply the conventional technology to a recording medium having a standardized format such as the BD (Blu-ray Disc) standard. This is because special reproduction cannot be performed using arbitrary picture data. For example, according to the BD standard, a recording device can record, on a disc, management data relating to a picture used in fast-forward playback of video. However, the recordable data capacity is limited, and it is not possible to record sufficient management data for the storage capacity of the disc. In this case, the number of pictures that can be used during fast-forward playback is reduced, and when fast-forward playback is performed, only a greatly thinned-out intermittent video is displayed.
[0007]
In addition, if processing for once decoding a data stream and generating data for special reproduction is adopted so that noise does not occur, then processing for re-encoding and converting to MPEG transport stream packets must be continuously performed. A very complex and expensive system is required.
[0008]
An object of the present invention is to apply the present invention to a recording medium having a standardized format without holding the picture position information required for special reproduction in the recording medium in order to maximize the capacity of the recording medium. It is to provide easy technology. Another object of the present invention is to realize special reproduction free from noise by simple processing different from complicated processing such as encoding after decoding and packet conversion.
[0009]
[Means for Solving the Problems]
The data processing device of the present invention is a receiving unit that receives a data stream read from a recording medium and packetized into a plurality of packets, wherein the data stream includes a picture header and picture data, Represents a picture, the picture header identifies a position of the picture data in the data stream, a receiving unit, packet identification information for detecting the picture header from the data stream, and identifying a packet including the picture header A detecting unit that generates a special reproduction packet including the picture header based on the packet specifying information; specifying a position of the one or more special reproduction packets based on the picture header; Data stream for trick play from the trick play packet of It comprises a control unit for generating a beam, and an output unit for outputting the data stream for the special reproduction. This achieves the above object.
[0010]
Each of the plurality of packets has a packet header describing packet management data related to the attribute of the packet, the control unit, a part of the plurality of packets of the data stream received in the receiving unit, The one or more special reproduction packets are sequentially extracted from the special reproduction packet located at the top of the one or more special reproduction packets, and a part of the extracted data stream is filtered based on the packet management data to perform the one or more special reproduction packets. Packets may be extracted to generate a trick play data stream from the one or more trick play packets.
[0011]
The control unit may extract the one or more special reproduction packets whose positions are specified from the data stream received by the reception unit, and generate the special reproduction data stream.
[0012]
The picture header further includes type information that specifies the type of the picture, the detection unit detects the type information, the control unit receives the type information from the detection unit, and further includes The one or more special reproduction packets may be extracted according to the type of the picture specified based on the special reproduction packet.
[0013]
Each of the one or more trick-play packets has a packet header describing packet management data relating to the attribute of the packet. When the specific packet contains picture data necessary for the trick play, a header for trick play that specifies the position of the picture data needed for the trick play, and other data than the packet management data, The image processing apparatus may further include a packet processing unit that replaces the other data with dummy data that does not affect decoding of the trick play picture data.
[0014]
The specific packet may be at least one of a first packet and a last packet of a packet sequence including the extracted one or more special reproduction packets.
[0015]
The data processing device is a header position detecting unit that detects a position of the picture header and obtains a data amount from a head of the specific packet to a position of the picture header, wherein the specific packet is a head packet. At the time, based on the obtained data amount, the other data existing before the picture header is replaced with the dummy data, and when the specific packet is the last packet, the obtained The image processing apparatus may further include a header position detection unit that replaces the other data after the beginning of the picture header with the dummy data based on a data amount.
[0016]
The data stream may be a transport stream conforming to the MPEG standard, and the dummy data may be one of adaptation stuffing and zero stuffing.
[0017]
The data processing device may further include a stream generation unit that inserts a predetermined packet into the extracted special reproduction picture data to generate a transport stream compliant with the MPEG standard.
[0018]
The picture data may be encoded in a predetermined format, and the data processing device may further include a decoder for decoding the trick play picture data included in the one or more trick play packets.
[0019]
The output unit may output the trick play data stream to a transmission medium conforming to the IEEE 1394 standard.
[0020]
The recording medium may be at least one of a hard disk, a DVD medium, and a BD medium.
[0021]
A data processing program according to the present invention is a step of receiving a data stream read from a recording medium and packetized into a plurality of packets, wherein the data stream includes a picture header and picture data, and the picture data is Representing a picture, wherein the picture header identifies the location of the picture data in the data stream, and detecting the picture header from the data stream to generate packet identification information identifying the packet including the picture header. And identifying a special reproduction packet including the picture header based on the packet identification information; identifying a position of the one or more special reproduction packets based on the picture header; Playback from packet And generating a data stream, and outputting the data stream for the special reproduction. This achieves the above object.
[0022]
Each of the plurality of packets has a packet header describing packet management data relating to the attribute of the packet, and the step of generating the data stream for trick play includes the step of generating a plurality of packets of the received data stream. Extracting a part in order from the special reproduction packet positioned at the head of the one or more special reproduction packets, and filtering the extracted part of the data stream based on the packet management data. Extracting one or more packets for trick play to generate a data stream for trick play.
[0023]
The step of generating the data stream for trick play is a step of extracting the one or more packets for trick play whose position is specified from the received data stream to generate the data stream for trick play. You may.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a data processing device of the present invention will be described with reference to the accompanying drawings. First, the data structure of a data stream to be processed will be described with reference to FIGS. 1A and 1B, and then the configuration and operation of the data processing device will be described with reference to FIGS.
[0025]
FIG. 1A is a schematic diagram showing a data stream 10. In the present embodiment, the data stream 10 is, for example, a transport stream (TS) compliant with the MPEG standard. Hereinafter, “MPEG transport stream 10” is referred to as “MPEG transport stream 10”. The MPEG transport stream 10 includes various data, for example, moving image data, audio data, still image data, and text data. It is assumed that the illustrated MPEG transport stream 10 includes picture data 1 to 3 representing three different pictures.
[0026]
“Data stream” refers to a data sequence when transmitting data. The “data sequence” includes both a data sequence when transmitting data to the data processing device and a data sequence when transmitting data via the data bus in the data processing device. Note that when recorded on a recording medium, data exists in the form of a file, not a stream.
[0027]
The MPEG transport stream 10 is composed of a plurality of packets. FIG. 1B is a schematic diagram illustrating the data structure of the MPEG transport stream 10 that has been packetized. In the figure, MPEG transport stream packets (hereinafter, referred to as “TS packets”) P1 to P100 are shown.
[0028]
First, a general TS packet will be described with reference to the TS packet P1. The TS packet P1 has a fixed length of 188 bytes. The TS packet P1 includes a packet header 11a and a data field 11b.
[0029]
The packet header 11a has a fixed length of 4 bytes, and describes packet management data on attributes of each packet for the receiving side. The packet management data is, for example, a packet identifier (PID) for identifying the type of the TS packet and various flags. The packet number of the TS packet is also described in the packet header 11a.
[0030]
On the other hand, the data field 11b includes a variable-length adaptation field and / or a payload. In the adaptation field, clock information and adjustment data for setting the TS packet to a fixed length of 188 bytes are described. The data adjustment function using the adaptation field is called a stuffing function. The payload includes PES packets containing individual streams such as video data and audio data, and table information indicating the relationship between programs contained in the streams and program elements such as video and audio streams that constitute the programs. Etc. are described.
[0031]
Next, the picture data included in the TS packet P2 will be described. In the data field following the packet header 12a of the TS packet P2, a part 12b of picture data constituting picture 1, a picture header 12c being part of picture data constituting picture 2, and picture data 12d are described. . In the example of FIG. 1B, the picture header 12c is arranged before the corresponding picture data 12d.
[0032]
The picture header 12c specifies the position of the picture data in the MPEG transport stream 10. First, at the head of the picture header 12c, a specific data pattern that can be recognized as the head of the picture header, for example, "00 00 01 00" is arranged. Further, the picture header 12c describes the type of the subsequent picture data (picture type). When the picture 2 is an I picture defined by the MPEG standard, the picture header 12c describes data indicating that the picture is an I picture.
[0033]
After the picture data 12d, the picture data of the picture 2 is described in the subsequent TS packets P3 to P99 as indicated by the symbol “I”. Note that the picture data of the same picture does not necessarily have to be described in consecutive TS packets. This is because the same PID is assigned to the picture data of the same picture by the packet header of the TS packet. When all the picture data of the picture 2 is described, a picture header 13c indicating the picture 3 is arranged to transmit the next picture 3. The picture 3 whose transmission starts from the TS packet P99 is a P picture defined by the MPEG standard as indicated by a symbol “P”.
[0034]
Next, the configuration of the data processing device 100 of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the data processing device 100 of the present invention. The data processing device 100 receives the MPEG transport stream 10 from an external device having a recording medium on which the MPEG transport stream 10 is recorded, and performs normal reproduction or special reproduction. In the example of FIG. 2, the data processing device 100 is connected to an optical disk drive 200 using an optical disk such as a DVD or a BD (Blu-ray Disc) as a recording medium, a hard disk drive (HDD) 300 using a magnetic disk as a recording medium, and the like. ing. In this specification, “normal reproduction” refers to reproducing video data included in a data stream such as the MPEG transport stream 10 at a normal speed. On the other hand, “special reproduction” refers to reproducing video data included in a data stream at a speed different from a normal speed. The trick play includes fast forward play, rewind play, and slow play.
[0035]
The data processing device 100 includes a control unit 102, a reception unit 104, a packet position detection unit 106, a memory 108, a byte position detection unit 110, a packet processing unit 112, an insertion packet generation unit 114, a stream generation unit 116, a decoding unit 118, and an output unit 120.
[0036]
The control unit 102 controls the operation of the data processing device 100. 3 and 4 described below are performed under the control of the control unit 102. The receiving unit 104 is an interface that receives the MPEG transport stream 10 recorded on the recording medium from the optical disc drive 200, the HDD 300, or the like.
[0037]
The packet position detection unit 106 detects a packet including a picture header from the plurality of TS packets of the MPEG transport stream 10 and transmits a packet number to the control unit 102 as information for specifying the packet. Further, the packet position detector 106 detects the type of picture data included in the picture header.
[0038]
The memory 108 sequentially stores the received MPEG transport streams 10. The amount of data stored in the memory 108 is managed by the control unit 102. When the amount of data in the memory 108 becomes equal to or less than the predetermined amount, the control unit 102 receives the MPEG transport stream 10 in the receiving unit 104 and stores it in the memory 108. This enables so-called "streaming reproduction" to perform reproduction while receiving.
[0039]
In the normal reproduction, the memory 108 outputs a TS packet including picture data of a program to be normally reproduced, based on an instruction from the control unit 102. These TS packets are sent to the decoding unit 118 via a path sent from the memory 108 to the decoding unit 118.
[0040]
On the other hand, during special reproduction, a TS packet including a special reproduction picture header and a TS packet sequence including special reproduction picture data are extracted from the memory 108 based on an instruction from the control unit 102. These TS packets flow on a path input from the memory 108 to the byte position detection unit 110. Here, the "picture data for special reproduction" is picture data representing a picture required for special reproduction. The “special playback picture header” is a picture header that specifies the position of the special playback picture data in the MPEG transport stream 10.
[0041]
The byte position detection unit 110 detects the number of the byte from the top of the TS packet including the header of the special reproduction picture header. As described above, since a specific data pattern that can be recognized as the head of the picture header exists at the head of the picture header, the byte position detecting unit 110 determines how many bytes from the head of the TS packet Detect if it appears in your eyes.
[0042]
Referring again to FIG. 1B, the position of the special reproduction picture header will be described. Assuming that the picture header 12c is a picture header for special reproduction, the byte position detection unit 110 acquires the data amount from the head of the TS packet P2 to the picture header 12c. In the example shown in the figure, it is 50 bytes. At this time, since the special reproduction picture data is also included in the field 13b of the TS packet P99, the TS packet P99 is also extracted. Therefore, the byte position detection unit 110 also acquires the data amount from the head of the TS packet P99 to the picture header 13c. In the example shown in the figure, it is 80 bytes.
[0043]
The packet processing unit 112 receives the TS packet including the special reproduction picture header and the TS packet sequence including the special reproduction picture data, output from the byte position detection unit 110. Then, the packet processing unit 112 determines whether or not data other than the packet header, the special reproduction picture header, and the special reproduction picture data of the TS packet exists in the first packet and / or the last packet of the packet sequence. Is determined. The “other data” includes picture data other than the special reproduction picture data, and a picture header for specifying the position of the picture data. The determination of the picture data other than the special reproduction picture data is performed based on the position (data amount) of the picture header different from the special reproduction picture header from the head of the TS packet.
[0044]
As a result of the determination, if “other data” exists, the data is replaced with dummy data and output. “Dummy data” is data that does not affect decoding of special reproduction picture data. The range to be replaced with dummy data is determined based on the data amount from the head of the TS packet to the picture header. Specifically, when picture data of another picture exists in the first packet, the picture data of another picture existing before the picture header is replaced with dummy data based on the acquired data amount. On the other hand, when the picture data of another picture exists in the last packet, the picture data of another picture existing after the picture header is replaced with dummy data based on the acquired data amount.
[0045]
The replacement process with dummy data will be described with reference to FIGS. Consider the case where picture 2 is used for trick play. In the TS packet P2 in FIG. 1B, the picture data 12b is data constituting picture 1, while the picture header 12c and picture data 12d are data constituting picture 2. When the picture 2 is trick-played, if the TS packet P2 is directly input to the decoding unit 118, the picture data 12b constituting the picture 1 is also decoded, and noise such as block noise appears in the trick-play image of the picture 2. Therefore, the packet processing unit 112 replaces the picture data 12b constituting the picture 1 with the dummy data 14 shown in FIG. This dummy data 14 is specifically either adaptation stuffing or zero stuffing. The replacement process with the dummy data is also performed in the last TS packet P99 including the picture data of the picture 2. For the TS packet P99, the packet processing unit 112 replaces the picture header 13c and the picture data 13d with the dummy data 15. If no noise or the like occurs in the decoded picture 2, the picture header 13c need not be replaced with dummy data.
[0046]
As described above, by replacing the picture data different from the picture data necessary for the special reproduction with the dummy data, it is possible to suppress noise generated when decoding the picture data required for the special reproduction. The packet processing unit 112 discards a packet including data other than picture data used for special reproduction, and outputs a packet containing only picture data used for special reproduction.
[0047]
The insertion packet generation unit 114 compensates for the missing information because necessary information is lost when the packet processing unit 112 processes the packet, and inserts an MPEG transport stream packet that matches the grammar of MPEG2. The packet to be inserted is, for example, a transport stream packet including information such as a PCR (Program Clock Reference), a PSI (Program Specific Information), a PES header, a sequence header, and a sequence end.
[0048]
The PCR (Program Clock Reference) is information for setting the value of the STC (System Time Clock) to an intended value on the encoder side, and is added to the transport packet at least once every 100 ms and transmitted. This PCR may be lost by extracting a transport packet by trick play or the like. In such a case, a new PCR is generated every 100 msec for a picture for special reproduction, a transport packet including the PCR is generated, and the packet is interrupted and output.
[0049]
Next, PSI (Program Specific Information) is program specification information such as which program should be selected from the MPEG transport stream, which packet should be taken out, and how it should be decoded. It is sent as a transport packet. Like the PCR, the PSI may be lost when a transport packet is extracted. Therefore, it is necessary to add a transport packet including the PSI for trick play in the same manner as the PCR.
[0050]
PTS (Presentation Time Stamp) is a time stamp that determines the timing at which a picture is reproduced and displayed, and is added to the beginning of the picture data. When performing fast-forward playback or the like, the value of the PTS becomes meaningless, so it is necessary to rewrite the PTS for special playback.
[0051]
The PES (Program Elementary Stream) header is a header of a PES packet containing individual streams such as video data and audio data. The PES header is also added because it is lost when the transport packet is extracted.
[0052]
The sequence header (Sequence header) indicates the start of the program, and the sequence end header (Sequence End) indicates the end of the program. Since these are also lost when transport packets are extracted, they are added.
[0053]
FIG. 2 is referred to again. The stream generation unit 116 converts the packet of the MPEG transport stream 10 processed by the packet processing unit 112 and the insertion packet generated by the insertion packet generation unit 114 into MPEG2 grammar at the timing instructed by the control unit 102. It is generated as a matching MPEG transport stream 10. The MPEG transport stream 10 is a data stream for trick play.
[0054]
The decoding unit 118 decodes the encoded MPEG transport stream 10 to generate an original video.
[0055]
The output unit 120 is an interface that outputs video data to the outside of the data processing device 100. The output destination is, for example, a display (not shown).
[0056]
Although the data processing device 100 includes the decoding unit 118 in FIG. 2, the data processing device 100 may not necessarily include the decoding unit 118. When the decoding section 118 is not provided, the processing related to the decoding section 118 may be omitted in the reproduction processing described below. In this case, the MPEG transport stream 10 is received by the receiving unit 104, and is output from the output unit 120 to the transmission medium after passing through the memory 108. Alternatively, the output unit 120 outputs the data stream for trick play generated by the stream generation unit 116 to a transmission medium. The transmission medium is a cable conforming to a predetermined standard such as the IEEE 1394 standard, for example. Through such a transmission medium, the data processing apparatus 100 can transmit an undecoded data stream to an external device such as a set-top box having a decoding function.
[0057]
Next, the operation of the data processing device 100 will be described with reference to FIGS. FIG. 3 is a flowchart showing the procedure of the normal reproduction process.
[0058]
First, in step S30 of FIG. 3, the receiving unit 104 of the data processing device 100 receives the MPEG transport stream 10. As is clear from FIG. 1, the MPEG transport stream 10 is composed of one or more transport stream packets. Next, in step S31, the packet position detecting unit 106 recognizes the picture header by using a specific data pattern, and determines the position of the transport stream packet including the picture header and the type of the picture specified by the picture header. To detect. “Position” is specified by a number given to a transport stream packet including a picture header. On the other hand, the “picture type” is an I picture in the above example, and is described in the picture header. The detected result is sent to the control unit 102. Thereafter, in step S32, each packet of the MPEG transport stream 10 is stored in the memory 108. As shown in FIG. 1B, each packet is stored in the order in which the MPEG transport stream 10 is arranged based on the packet number of the packet.
[0059]
Next, in step S33, the packets of the MPEG transport stream 10 are read from the memory 108 in the order of storage. This reading may be performed after all the storage of the MPEG transport stream 10 is completed, or may be started before the storage is completed. In step S34, the decoding unit 118 decodes and outputs the picture data in the TS packet according to the type of the picture. Then, in step S35, the control unit 102 determines whether all packets have been processed, and if not, repeats the processing from step S33. When the processing ends, the normal reproduction processing ends.
[0060]
As described above, the data processing apparatus 100 analyzes the MPEG transport stream in the packet position detection unit 106 at the same time as receiving and reproducing the MPEG transport stream, and recognizes the position of the picture header. The data processing device 100 can obtain the type, storage location, and the like of the picture data based on the picture header. Even when the position information is not recorded on the recording medium, smooth reproduction becomes possible, and the capacity of the recording medium can be maximized. Furthermore, even if the MPEG transport stream is recorded in a format such as the BD standard, which cannot record sufficient position information, smooth reproduction can be performed similarly.
[0061]
Next, the operation of the data processing device 100 will be described with reference to FIGS. FIG. 4 is a flowchart showing the procedure of the trick play process. First, steps S30 to S32 in FIG. 4 are the same as steps S30 to S32 in FIG. Hereinafter, processing after the TS packet of the MPEG transport stream 10 is stored in the memory 108 will be described.
[0062]
In step S40 of FIG. 4, the control unit 102 reads, from the memory 108, a TS packet containing picture data of a picture necessary for trick play based on the position of the TS packet represented by the number assigned to the TS packet. Start extraction. Furthermore, when performing special reproduction by designating an I picture, for example, extraction of TS packets is started based on the type of picture. At this time, the control unit 102 also extracts a TS packet including a picture header for special reproduction. The extracted TS packet is input to the byte position detector 110. In step S41, the byte position detection unit 110 determines whether or not each of the extracted TS packets includes a picture header. If it is a TS packet that does not include a picture header, the process proceeds to step S45. Here, in the case of the first TS packet, since a picture header is included, the process proceeds to step S42. In step S42, the byte position detector 110 detects the position of the picture header from the beginning of the TS packet, and thereafter sends the TS packet to the packet processor 112. Subsequently, in step S43, the packet processing unit 112 determines whether or not the received TS packet includes data other than the packet header, the special playback picture header, and the special playback picture data of the TS packet. I do. The “other data” is, for example, picture data different from the special reproduction picture data or a picture header different from the special reproduction picture header. If “other data” is included, the process proceeds to step S44; otherwise, the process proceeds to step S45.
[0063]
In step S44, the packet processing unit 112 replaces the “other data” with dummy data. Then, in step S45, the stream generation unit 116 inserts the packet generated by the insertion packet generation unit 114 into the processed TS packet sequence to generate an MPEG transport stream for special reproduction. The stream generator 116 sends the generated stream to the decoder 118. In step S46, the decoding unit 118 analyzes the MPEG transport stream for special reproduction, decodes and outputs picture data in each TS packet constituting the stream. In step S47, the control unit 102 determines whether or not all necessary TS packets have been extracted from the memory 108. If all the TS packets have not been extracted, the processing from step S40 is repeated. On the other hand, when the extraction is completed, the process ends.
[0064]
The special reproduction process of the data processing device 100 has been described above. In the above description of step S40, it has been described that the control unit 102 extracts a TS packet including the special playback picture header and a TS packet sequence including the special playback picture data from the memory 108. However, the control unit 102 can also read TS packets from the memory 108 in order from the TS packet including the leading special reproduction picture header. In this case, the output TS packet sequence includes, in addition to the TS packet sequence including the special reproduction picture header or the special reproduction picture data, a TS packet other than the TS packet used for the special reproduction, for example, audio data. Including TS packets. Therefore, the control unit 102 filters the output TS packet sequence based on a packet identifier (PID) for identifying the type of the TS packet. As a result of the filtering, TS packets other than the TS packets used for trick play are removed. The TS packet sequence obtained as a result is only a TS packet including the special reproduction picture header and a TS packet sequence including the special reproduction picture data. After that, the processing after step S41 may be performed.
[0065]
The operation of the data processing device 100 according to the present invention has been described above. In this specification, the operation has been described separately for the normal reproduction shown in FIG. 3 and the special reproduction shown in FIG. 4, but these can be switched at any time. For example, when the user instructs the special reproduction in the middle of the normal reproduction, the processing of the special reproduction may be performed, for example, from step S40 in FIG. Conversely, if the user instructs normal reproduction during special reproduction, special reproduction processing may be performed, for example, from step S33 in FIG.
[0066]
3 and 4 include the case where the data processing device 100 performs streaming reproduction. In streaming reproduction, the control unit 102 receives the MPEG transport stream 10 and stores it in the memory 108 according to the amount of data stored in the memory 108. Therefore, it is sufficient for the control unit 102 to make the determination based on the TS packet existing in the memory 108 in step S35 of FIG. 3 and step S47 of FIG.
[0067]
In these flowcharts, it has been described that the processing is performed based on the picture header. However, even for an MPEG transport stream in which a sequence header or a GOP header exists before a picture header, the packet position and the byte position from the beginning of the packet are detected using those headers, and special reproduction is performed. You can also.
[0068]
The processing of the data processing apparatus 100 described above is realized based on a computer program that defines processing according to the flowcharts of FIGS. Such a computer program can be recorded on various recording media such as a magnetic recording medium such as a flexible disk, a semiconductor recording medium such as a flash memory, and an optical recording medium such as an optical disk. It can be transmitted via Furthermore, one or more semiconductor recording media storing such a computer program may constitute an individually distributed chipset. The computer program is executed by a central processing unit (CPU) (not shown) of the data processing device 100. At this time, the central processing unit includes, for example, the control unit 102, the packet position detection unit 106, the byte position detection unit 110, the packet processing unit 112, and the insertion packet generation unit 114 among the components of the data processing device 100 illustrated in FIG. , Can operate as the stream generation unit 116.
[0069]
In this specification, the processing of the data processing apparatus 100 for reproducing the MPEG transport stream 10 recorded on the recording medium has been described. When the data processing apparatus 100 has a function of receiving and recording the MPEG transport stream 10, since the data processing apparatus 100 has a function block for detecting each picture position of the received stream, the function block is used as the packet position detection unit 106. By functioning, components can be shared.
[0070]
【The invention's effect】
According to the present invention, a data stream is analyzed at the time of reproduction, and a packet position including a picture header of an arbitrary picture is detected. By using the picture header, the position of the picture data in the data stream can be specified. Therefore, the data stream can be reproduced without providing the picture position information for specifying the picture position in advance. Therefore, the picture position information can be used to the maximum capacity of a recording medium such as a hard disk. Further, it is possible to cope with a format such as the BD standard in which picture position information cannot be completely recorded.
[0071]
Further, since the position of arbitrary picture data can be specified even during special reproduction, only necessary picture data can be extracted. Therefore, it is not necessary to decode the encoded picture data once and encode again, so that special reproduction without noise can be realized.
[Brief description of the drawings]
1A is a schematic diagram showing a data stream 10, FIG. 1B is a schematic diagram showing a data structure of a packetized MPEG transport stream 10, and FIG. 1C is a schematic diagram showing dummy data. FIG. 14 is a diagram showing a TS packet sequence of picture 2 after replacement.
FIG. 2 is a block diagram illustrating a configuration of a data processing device 100 according to the present invention.
FIG. 3 is a flowchart illustrating a procedure of a normal reproduction process.
FIG. 4 is a flowchart showing a procedure of a special reproduction process.
[Explanation of symbols]
100 Data processing device
102 control unit
104 Receiver
106 packet position detector
108 memory
110 byte position detector
112 Packet processing unit
114 insertion packet generator
116 stream generator
118 Decoding unit
120 Output unit

Claims (15)

A receiver for receiving a data stream read from a recording medium and packetized into a plurality of packets, wherein the data stream includes a picture header and picture data, the picture data represents a picture, and the picture header Specifies a position of the picture data in the data stream, a receiving unit,
A detection unit that detects the picture header from the data stream and generates packet identification information that identifies a packet including the picture header;
A special reproduction packet including the picture header is specified based on the packet specifying information, a position of the one or more special reproduction packets is specified based on the picture header, and a special reproduction packet is specified from the one or more special reproduction packets. A control unit for generating a data stream for reproduction;
A data processing device comprising: an output unit that outputs the data stream for trick play. Each of the plurality of packets has a packet header describing packet management data relating to the attribute of the packet,
The control unit sequentially extracts a part of the plurality of packets of the data stream received by the receiving unit from the special reproduction packet located at the head of the one or more special reproduction packets, and And filtering the data stream of the unit based on the packet management data to extract the one or more trick-play packets and generate a trick-play data stream from the one or more trick-play packets. A data processing device according to claim 1. 2. The control unit according to claim 1, wherein the control unit extracts the one or more trick play packets whose positions are specified from the data stream received by the receiving unit, and generates the trick play data stream. 3. Data processing device. The picture header further includes type information for specifying the type of the picture,
The detection unit detects the type information,
4. The control unit according to claim 3, wherein the control unit receives the type information from the detection unit, and further extracts the one or more special reproduction packets according to a type of the picture specified based on the type information. Data processing device. Each of the one or more trick play packets has a packet header describing packet management data relating to the attribute of the packet.
A specific packet among the extracted one or more special reproduction packets includes picture data necessary for the special reproduction, a special reproduction header for specifying a position of the picture data required for the special reproduction, and the packet management. The packet processing unit according to any one of claims 1 to 4, further comprising a packet processing unit that, when data other than the data is included, replaces the other data with dummy data that does not affect decoding of the special reproduction picture data. The data processing device according to any one of the above. The data processing device according to claim 5, wherein the specific packet is at least one of a first packet and a last packet of a packet sequence including the extracted one or more special reproduction packets. A header position detection unit that detects a position of the picture header and obtains a data amount from a head of the specific packet to a position of the picture header,
When the specific packet is a leading packet, based on the obtained data amount, the other data existing before the picture header is replaced with the dummy data,
If the specific packet is the last packet, based on the obtained data amount, the other data after the beginning of the picture header, further comprising a header position detection unit replacing the dummy data, The data processing device according to claim 6. The data processing device according to claim 5, wherein the data stream is a transport stream conforming to the MPEG standard, and the dummy data is one of adaptation stuffing and zero stuffing. The data processing apparatus according to claim 8, further comprising a stream generation unit configured to insert a predetermined packet into the extracted special reproduction picture data to generate a transport stream compliant with the MPEG standard. The picture data is encoded in a predetermined format,
10. The data processing device according to claim 1, further comprising a decoder for decoding the trick play picture data included in the one or more trick play packets. The data processing device according to claim 1, wherein the output unit outputs the trick play data stream to a transmission medium conforming to the IEEE 1394 standard. The data processing device according to claim 1, wherein the recording medium is at least one of a hard disk, a DVD medium, and a BD medium. Receiving a data stream read from a recording medium and packetized into a plurality of packets, the data stream including a picture header and picture data, the picture data representing a picture, and the picture header Locating the picture data in the data stream;
Detecting the picture header from the data stream and generating packet identification information for identifying a packet including the picture header;
A special reproduction packet including the picture header is specified based on the packet specifying information, a position of the one or more special reproduction packets is specified based on the picture header, and a special reproduction packet is specified from the one or more special reproduction packets. Generating a data stream for playback;
Outputting the data stream for trick play. Each of the plurality of packets has a packet header describing packet management data relating to the attribute of the packet,
The step of generating a data stream for trick play includes:
Extracting a part of the plurality of packets of the received data stream in order from the special reproduction packet located at the head of the one or more special reproduction packets;
Filtering the extracted part of the data stream based on the packet management data to extract the one or more trick-play packets and generate the trick-play data stream. A data processing program according to claim 1. The step of generating a data stream for trick play includes:
14. The non-transitory computer-readable storage medium according to claim 13, wherein the one or more trick-play packets whose positions are specified are extracted from the received data stream to generate the trick-play data stream.

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