WO2006115151A1 - 記録装置、再生装置、記録再生装置、記録プログラムとその記録媒体、再生プログラムとその記録媒体 - Google Patents
記録装置、再生装置、記録再生装置、記録プログラムとその記録媒体、再生プログラムとその記録媒体 Download PDFInfo
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- WO2006115151A1 WO2006115151A1 PCT/JP2006/308240 JP2006308240W WO2006115151A1 WO 2006115151 A1 WO2006115151 A1 WO 2006115151A1 JP 2006308240 W JP2006308240 W JP 2006308240W WO 2006115151 A1 WO2006115151 A1 WO 2006115151A1
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- stream
- access point
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- management information
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42646—Internal components of the client ; Characteristics thereof for reading from or writing on a non-volatile solid state storage medium, e.g. DVD, CD-ROM
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
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- 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
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
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- 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
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
- G11B27/327—Table of contents
- G11B27/329—Table of contents on a disc [VTOC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
- H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8455—Structuring of content, e.g. decomposing content into time segments involving pointers to the content, e.g. pointers to the I-frames of the video stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
-
- 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
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/1062—Data buffering arrangements, e.g. recording or playback buffers
- G11B2020/1075—Data buffering arrangements, e.g. recording or playback buffers the usage of the buffer being restricted to a specific kind of data
- G11B2020/10759—Data buffering arrangements, e.g. recording or playback buffers the usage of the buffer being restricted to a specific kind of data content data
- G11B2020/10768—Data buffering arrangements, e.g. recording or playback buffers the usage of the buffer being restricted to a specific kind of data content data by pre-caching the initial portion of songs or other recorded or downloaded data for starting playback instantly
Definitions
- the present invention relates to a recording apparatus that records stream data such as broadcast data on a recording medium, and a reproducing apparatus that reproduces and outputs video / audio data recorded on the recording medium.
- ASF Advanced Systems Format
- FIG. 11 is an explanatory diagram showing a schematic structure of an ASF file.
- 1101 is the header 'object Common attributes are recorded throughout the file.
- Reference numeral 1102 denotes a data object that stores compressed video and audio data and is composed of a plurality of packets.
- 1103 is one of the packets included in the data object 1102. All packets are fixed length. In general, since one frame of compressed video is larger than one packet, one frame is often divided into a plurality of packets and stored. Similarly, when audio is stored at the same time as video, it is divided into packets and stored.
- the header object 1101 describes HD information for identifying which packet contains the video frame and which packet contains the audio data.
- Reference numeral 1104 denotes an index 'object, which will be described in detail later. Note that the position of the index 'object 1104 is recorded in the header' object 1101 so that the index 'object can be easily searched.
- FIG. 12 is an explanatory diagram showing a schematic structure of an index object (the power described as a simple 'index object in Non-Patent Document 1 is simply referred to as an index' object in this description). It is. 1201 is an index 'entry time interval T, 1202 is an index' total number of entries ⁇ , 1203 is an array of index 'entries, and is repeated for the total number of index entries ⁇ . Since index entries are arranged at regular intervals on the time axis, it is easy to find an index entry corresponding to a certain time. 1204 represents one element in the array of the index 'entry, and is composed of a packet number indicated by 1205 and the number of packets indicated by 1206. The packet number 1205 stores the first packet number of the key frame that is closest to the time indicated by the index entry. The number of packets 1206 stores the number of packets necessary to reconstruct the corresponding key frame.
- T an index 'entry time interval
- 1202 is an index' total number of entries ⁇
- 1203
- FIG. 13 is an explanatory diagram showing the correspondence between index entries and video frames.
- Each of the quadrilaterals in the upper part of Fig. 13 represents a video frame.
- a quadrilateral that has been squared or touched represents a key frame, and a quadrilateral that has no square or no stitching represents any other frame.
- the number line at the bottom is the time axis, and the time when the index 'entry exists is indicated by a black circle.
- the index entry 1301 points to the key frame 1302 as soon as possible at the time TX k! More specifically, the packet number of the packet in which the head of the key frame 1302 is stored, the total number of packets necessary to reconstruct the key frame 1302, and the power index entry 1301 are described.
- the packet number is also calculated by calculating the position in the recorded data, so that the packets necessary to reconstruct the key frame 1302 are extracted, so that the replay starts at or near the time TX k. can do.
- video and audio are MPEG-2 TS (Transport Streanu method (see ISO 13818-1: 2000, Generic coding of moving pictures and a ssociated audio information: Systems).
- TS Transport Streanu method
- ISO 13818-1 2000, Generic coding of moving pictures and a ssociated audio information: Systems.
- PID Packet ID
- the TS method is a multiplex method for broadcasting, and there is no equivalent to the ASF header 'object in order to enable playback from the middle by channel switching or the like.
- the TS method has a structure called PMT (Program Map Table) that is multiplexed in the stream at a fixed period instead of the ASF header 'object, and the video and audio PIDs are stored here.
- PMT Program Map Table
- the playback side first searches for and analyzes the PMT, obtains video and audio PIDs, extracts video and audio TS packets based on this, and starts playback.
- PMT information may change during the broadcast, and it is necessary to always analyze the latest PMT.
- the PMT is stored in the TS packet like other data.
- TS broadcasting is recorded as TS, and the file format at that time is ASF. If something similar to is used, there will be inconvenience due to the nature of PMT. In other words, in ASF, what corresponds to the PID of video and audio is stored in the header 'object, and this value is unchanged throughout the file, whereas in TS, the contents of PMT change in the middle of the file. As a result, centralized management by header object becomes difficult.
- the PMT Since the PMT is periodically inserted in the TS, playback itself is not impossible. However, if random access using the index 'object' is attempted, the packet pointed to by the index 'entry is a video content packet and not a PMT packet. As a result, playback from the key frame closest to the target time becomes impossible.
- the present invention has been made in view of the above problems, and an object of the present invention is to quickly start playback when a stream in which a control signal is periodically inserted is played back by random access. There is in doing so.
- the recording apparatus of the present invention is a recording apparatus that records on a recording medium a stream composed of a plurality of packets into which control information is periodically inserted, and decodes the control information.
- a management information generating unit that generates management information for managing a plurality of random access points included in the stream, and the stream and the generated management information are stored in the recording medium. It is characterized by recording.
- the management information generator generates management information for managing each random access point based on the control information included in the stream and the position of the random access point of the media. Generate. Then, the recording device records the management information and the stream generated in this way on a recording medium. As a result, the stream and management information can be managed uniformly and used for ⁇ IJ. Therefore, when a stream recorded in this way is played back by random access, it is a stream in which control signals are periodically inserted. Even if there is, playback can be started quickly.
- a management information multiplexing unit that multiplexes the management information and the packet included in the stream is provided, and information obtained by multiplexing the management information and the packet is stored in the recording medium.
- information obtained by multiplexing the management information and the packet is stored in the recording medium.
- control information can be added to a stream and recorded, it is not necessary to distinguish between a random access point of control information and a random access point of media.
- the management information and the information multiplexed with the packet are recorded in the area to be added. The area can be used effectively.
- the management information may be composed of a plurality of entries, and each entry may include a random access point position and reproduction time information.
- a desired random access point can be quickly analyzed based on information on the position of the random access point and the reproduction time of the random access point included in the management information. Also, the size of management information can be reduced as long as the management information includes entries for each random access point included in the stream.
- the management information includes a first entry including information on a position of the random access point and a second entry including information corresponding to the reproduction time of the random access point on a one-to-one basis. Even the configuration.
- the random access point corresponding to the desired playback time is analyzed using the second entry corresponding to the playback time of the random access point, Based on the analysis result, the position of the random access point at which playback is started can be determined. Therefore, this makes it possible to quickly find information on the position of the desired random access point.
- the management information may include a PID indicating the type of each medium included in the stream.
- the media is information other than the control information stored in each packet, and for example, video information and audio information correspond to this.
- PID Packet ID
- PID Packet ID
- the step of decoding the control signal in the control information decoding unit can be omitted.
- the management information may include information indicating the position of the random access point, and the size from the head of the stream may be used as information indicating the position of the random access point.
- the management information includes information indicating the position of the random access point, and is attached to each packet included in the stream in the order of the head strength of the stream as information indicating the position of the random access point. It may be configured to use the assigned packet number.
- the packet position corresponding to the random access point can be easily specified by the packet number.
- the management information includes information indicating the position of the random access point. As information indicating the position of the random access point, the head power of the stream, the size to each random access point, and the head of the stream It is also possible to use a difference from the size up to the random access point adjacent to each random access point.
- the head power of the stream is the size of each random access point, and from the head of the stream to the random access point adjacent to each random access point. The difference from the size is used. Thereby, the size of the entire management information can be reduced.
- the management information includes information indicating the position of the random access point, and as the information indicating the position of the random access point, the leading force of the stream is sequentially added to each packet included in the stream.
- the difference between the packet number of each random access point and the packet number of the random access point adjacent to each random access point may be used.
- the playback device of the present invention is a playback device that reads a stream composed of a plurality of packets into which control information is periodically inserted from a recording medium and plays back the stream.
- a management information analysis unit that analyzes the position of a random access point based on management information for managing a plurality of random access points included in the stream, recorded on the recording medium together with the stream, and the analysis
- a stream reading unit that reads the stream recorded on the recording medium based on the position of the random access point, and each packet included in the read stream includes a packet and media including control information.
- a data separation unit that separates the packet, and a media recovery unit that decrypts the packet including the media.
- the position of the random access point is analyzed based on the management information recorded together with the stream on the recording medium, and the stream force control information is obtained based on the analysis result! You can get it quickly. For this reason, even a stream in which control signals are periodically inserted can be quickly started to be reproduced.
- a configuration may be provided that includes a management information separation unit that separates the stream information from the management information multiplexed in the stream.
- the management information analysis unit may be configured to analyze the position of the random access point based on the reproduction time information of the random access point included in the management information.
- the information indicating the position of the random access point can be quickly analyzed based on the information on the playback time of the random access point included in the management information. Can be shortened.
- the management information analysis unit has a one-to-one correspondence between the first entry including the location information of the random access point included in the management information and the reproduction time of the random access point. Based on the second entry containing the corresponding information, and the configuration of analyzing the position of the random access point to start playback based on. [0039] According to the above configuration, the random access point corresponding to the playback time at which playback is to be started is analyzed using the second entry, and the analysis result and the random access point included in the first entry are analyzed. Based on the position information, the position of the random access point at which playback is started can be specified. Therefore, there is no need to directly search for the first entry corresponding to the target playback time, and based on the second entry, the position of the random access point can be easily found and playback can be started quickly.
- the management information analysis unit analyzes a PID included in the management information and indicating the type of each medium included in the stream, and the data separation unit includes the management information analysis unit. Based on the analysis result, each packet included in the stream may be separated for each medium.
- the management information analysis unit analyzes the position of the random access point based on the size information from the head of the stream of each random access point included in the management information! / It is good as a configuration to do.
- the management information analysis unit includes a packet number assigned to each packet included in the stream in order of the head strength of the stream, a size of each packet, and the like included in the management information. Based on the product of the above, the configuration of analyzing the position of the random access point may be used.
- the management information analysis unit includes a size from the beginning of the stream to each random access point included in the management information, and a random access point adjacent to each random access point from the beginning of the stream. Based on the relative position information, which is the difference from the previous size, the configuration of the random access point position is also analyzed.
- the management information analysis unit assigns the packet of each random access point when the packet number is assigned to each packet included in the stream in order of the head strength of the stream.
- the random access point position may be analyzed based on the relative index value that is the difference between the packet number and the packet number of the random access point adjacent to each random access point, and the size of each packet. .
- the control information decoding unit further includes a control information decoding unit that decodes the control information included in the stream and extracts a PID indicating the type of each medium included in the stream from the decoded control information.
- Each packet included in the stream read by the stream reading unit may be separated for each medium based on the PID extracted by the control information decoding unit.
- the media included in the stream can be appropriately separated.
- a recording / reproducing apparatus of the present invention includes the recording apparatus and the reproducing apparatus.
- the stream and its management information are recorded on the recording medium during recording, and the position of the random access point is analyzed based on the management information recorded together with the stream during playback. Based on the analysis result, control information can be quickly obtained from the stream force. Therefore, it is possible to quickly reproduce the stream recorded on the recording medium.
- the recording method of the present invention is a recording method for recording, on a recording medium, a stream composed of a plurality of packets into which control information is periodically inserted.
- a management information generating step for generating management information for managing a plurality of random access points included in the stream based on the position of the random access point; and the stream and the generated management information are stored in the recording medium.
- a recording step of recording on the recording medium is a recording method for recording, on a recording medium, a stream composed of a plurality of packets into which control information is periodically inserted.
- the control information included in the stream and the random Management information for managing each random access point is generated based on the location of the access point. Then, the management information and the stream generated in this way are recorded on a recording medium. As a result, the stream and management information can be managed and used in a unified manner. Therefore, when a stream recorded in this way is played back by random access, playback can be started quickly even for a stream in which a control signal is periodically inserted.
- the playback method of the present invention is a playback method for reading a stream composed of a plurality of packets into which control information is periodically inserted from a recording medium and playing back the stream.
- a management information analysis step for analyzing the position of the random access point based on management information for managing a plurality of random access points included in the stream, recorded on the recording medium together with the stream, and the analysis Based on the position of the random access point, a stream reading step for reading the stream recorded on the recording medium, and each packet included in the read stream into a packet including control information and a packet including media.
- a data separation step for separating, and a medium for decoding a packet including the media. Are as comprising a A decoding process.
- the position of the random access point is analyzed based on the management information recorded together with the stream on the recording medium, and the streamer is also determined based on the analysis result. Control information can be obtained quickly. For this reason, even a stream in which control signals are periodically inserted can be quickly started to be reproduced.
- the recording program of the present invention is for causing a computer to execute the processing of each step in the recording method described above. By causing the computer to read this program, the processing of each of the above steps can be realized by the computer.
- the recording program can be easily stored and distributed. Furthermore, by reading the recording medium, it is possible to perform processing of each step in the recording method of the present invention by a computer.
- the playback program of the present invention performs processing of each step in the playback method described above. This is to cause the data to be executed. By causing the computer to read this program, the processing of each of the above steps can be realized by the computer.
- the reproduction program can be easily stored and distributed. Further, by reading the recording medium, the computer can perform the processing of each step in the reproducing method of the present invention.
- FIG. 1 is a block diagram showing a schematic configuration of a recording apparatus according to an embodiment of the present invention.
- FIG. 2 (a) is an explanatory diagram showing the structure of a stream input to the recording apparatus according to an embodiment of the present invention.
- FIG. 2 (b) is an explanatory diagram showing the configuration of each packet in the stream shown in FIG. 2 (a).
- FIG. 3 is an explanatory diagram showing an example of control information decrypted by the recording apparatus according to the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an example of an entry included in the management information generated by the recording apparatus according to the embodiment of the present invention and a relationship between the entry and a random access point in the stream.
- FIG. 5 is an explanatory diagram showing another example of management information generated by the recording apparatus according to an embodiment of the present invention and the relationship between the entry and a random access point in the stream.
- FIG. 6 (a) is an explanatory diagram showing an example of a format of management information recorded on a recording medium by a recording apparatus according to an embodiment of the present invention.
- FIG. 6 (b) is an explanatory diagram showing an example of a format of management information recorded on a recording medium by a recording apparatus according to an embodiment of the present invention.
- FIG. 6 (c) is an explanatory diagram showing an example of a format of management information recorded on a recording medium by a recording apparatus according to an embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing an example of a packet recorded on a recording medium by a recording apparatus according to an embodiment of the present invention.
- FIG. 8 is a block diagram showing a schematic configuration of a playback apparatus according to an embodiment of the present invention.
- FIG. 9 is a block diagram showing another schematic example of a playback apparatus according to an embodiment of the present invention.
- FIG. 10 When performing fast forward and fast reverse in the playback apparatus according to an embodiment of the present invention.
- FIG. 12 is an explanatory diagram showing a schematic structure of an index object included in the ASF file shown in FIG. 11.
- FIG. 13 is an explanatory diagram showing a correspondence relationship between an index entry and a frame in moving image content in the ASF file shown in FIG. 11.
- FIG. 14 is a flowchart showing the flow of processing in the recording apparatus according to one embodiment of the present invention.
- FIG. 15 is a flowchart showing the flow of processing in the reproducing apparatus according to one embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration of a data recording apparatus 100 that is a recording apparatus according to the present embodiment.
- the data recording apparatus 100 includes a random access information analysis unit 101, a control information decoding unit 102, a management information generation unit 103, a recording control unit 105, and a reception control unit 106.
- the data recording apparatus 100 receives a stream input from the outside by the reception control unit 106, and stores the received stream and management information (details will be described later) generated based on the stream. Is to record
- the reception control unit 106 receives a stream from the outside by controlling a reception unit (not shown).
- the stream received by the data recording apparatus 100 is composed of, for example, compressed video data and is composed of a plurality of packets.
- the reception control unit 106 inputs the received stream to the random access information analysis unit 101, the control information decoding unit 102, and the recording control unit 105, respectively.
- Random access information analysis unit 101 receives a stream composed of a plurality of packets as input, and analyzes header information and the like of each packet using control information described later. The analysis result is output to the management information generating unit 103 as random access information indicating whether or not the packet includes data that can be randomly accessed, random access type, and packet identification information for identifying the packet. To do.
- Control information decoding section 102 extracts only packets that contain the input stream power control information, and decodes the extracted packets to generate control information.
- the generated control information is output to the random access information analysis unit 101 and the management information generation unit 103.
- Management information generating section 103 generates management information from random access information, random access type, packet identification information, and control information. Then, the generated management information is output to the recording control unit 105.
- the recording control unit 105 includes the management information generated by the management information generating unit 103 and the stream. Recorded on the recording medium 104.
- the recording medium 104 may be a recording medium mounted on the data recording apparatus 100 or a recording medium configured to be separable from the data recording apparatus 100. Examples of the recording medium 104 include tape systems such as magnetic tapes and cassette tapes, magnetic disks such as flexible disks and hard disks, disk systems such as CD / MO / MD / DVD, IC cards (including memory cards), etc.
- Recording media such as a card memory, or a semiconductor memory system such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), or flash ROM can be applied.
- a transmission medium a medium that fluidly holds data
- a communication network including the Internet connected to a wired line or a wireless line.
- the recording control unit 105 outputs the management information and the stream to other devices connected via the communication line.
- control information and video frame are mainly included as the types of information included in the stream.
- the type of information included in the stream is not limited to this.
- two or more types of media (information) such as an audio frame, a BML document, and a still image may be included in addition to the information.
- FIG. 14 is a flowchart showing the flow of processing in the data recording apparatus 100.
- the reception control unit 106 first inputs the received stream to the random access information analysis unit 101, the control information decoding unit 102, and the recording control unit 105 (Sl).
- FIG. 2 (a) is an explanatory diagram showing the configuration of a stream (a stream received by the data recording device 100) input to the data recording device 100
- FIG. 2 (b) is a diagram of FIG. 2 (a).
- 4 is an explanatory diagram showing a configuration of each packet in the stream shown in FIG.
- the stream input to the data recording apparatus 100 is a concatenation of a plurality of fixed-length packets, and various types of information such as video frames and control information are contained therein. included.
- each packet consists of a header and a payload that stores compressed data.
- the header contains PID (Packet ID)! /
- a number corresponding to the type of compressed data included in the payload is assigned to the PID (PID value).
- PID Packet ID
- the header includes head identification information indicating whether the compressed data includes a position where it can be decoded midway, such as a key frame of a video, for example.
- the packet indicated by the arrow is recognized as a randomly accessible packet (random access point) by this head identification information.
- payload, unit, start, indie atom correspond to the head identification information.
- the control information decoding unit 102 selects a packet having the PID determined for the control information of each packet included in the input stream (S2). That is, in the data recording device 100, when the compressed data included in the payload is control information, a storage means (not shown) that pre-stores PID (PID for control information) assigned to the packet is stored. ) Is provided, and the control information decoding unit 102 selects a packet having the same PID as the PID stored in the storage means as a control information packet (packet including control information in the payload).
- control information decoding section 102 recognizes a randomly accessible packet by using the head identification information (S3). That is, referring to the head identification information included in the packet selected as the control information packet in S2, the middle power of the selected packet is recognized as a random accessible packet.
- control information decoding unit 102 accesses the randomly accessible bucket (random access point) recognized in S3, and decodes the control information starting from the packet (S4).
- FIG. 3 is an explanatory diagram showing an example of the control information decoded by the control information decoding unit 102.
- the control information includes an identifier and video indicating the control information, It consists of the PID of each media such as voice and data (PID of the packet that contains each media).
- An example of control information is PMT (Program Map Table) power in MPEG-2 TS, for example.
- control information decoding section 102 outputs the control information obtained by decoding to random access information analyzing section 101 and management information generating section 103 (S5).
- the random access information analysis unit 101 generates a random access type (random access type information) by using the PID of each medium included in the stream (S6). In other words, based on the PID of each medium included in the control information decoded by the control information decoding unit 102, the medium of each packet (or packet corresponding to the random access point) in the input stream is specified. Then, a random access type indicating the type of the media is generated.
- a random access type random access type information
- the random access information analysis unit 101 generates random access information that is information indicating a result of determining whether or not the packet includes data that can be randomly accessed (S7).
- the head identification information may be used as it is as the random access information.
- the packet that becomes the random access point may be specified by an appropriate method according to the data compression method of the stream. For example, when H.264 is used in digital broadcasting, the head identification information indicates that the head of the frame is included instead of information indicating a random access point.
- the random access information analysis unit 101 receives the random access type generated in S6, the random access information generated in S7, and the packet identification information for identifying each packet.
- the data is output to 103 (S8).
- the packet identification information includes, for example, the reproduction time of each packet, an index value uniquely assigned to each packet, and a stream. The number of bytes from the beginning of the message, the number of bytes from the previous packet or the previous random access point, the index value, etc. can be used.
- the management information generation unit 103 performs management based on the control information input from the control information decoding unit 102 and the random access type, random access information, and packet identification information input from the random access information analysis unit 101. Information is generated and output to the recording control unit 105 (S9). Note that the management information generated by the management information generating unit 103 includes information for managing random access points included in the stream. In a playback device that plays back a stream recorded by the data recording device 100, by using information (hereinafter referred to as an entry) for managing the random access information included in the management information, It is also possible to regenerate midway force.
- information hereinafter referred to as an entry
- FIG. 4 is an explanatory diagram showing an example of an entry included in the management information and a relationship between the entry and a random access point in the stream.
- each entry included in the management information includes information on “type”, “time”, and “entry position”.
- Each entry has a one-to-one correspondence with a random access point in the stream.
- entry 1 corresponds to the random access point of the control information in the stream
- entry position of entry 2 corresponds to the random access point of the video frame in the stream.
- Type is information indicating the type of random access point corresponding to the entry.
- entry 1 corresponds to control information
- entry 2 corresponds to a video frame.
- “Time” is information indicating the playback time of the media corresponding to the entry.
- playback time t2 is stored in entry 2 corresponding to the video frame at display time t2.
- control information does not include information corresponding to the playback time, but the size of one entry can be fixed by setting an appropriate value.
- entry 1 in FIG. 4 uses playback times tO and t2 of frames before and after the control information corresponding to the entry, and uses time tl that satisfies tO and tl ⁇ t2.
- the time setting method in the entry of the control frame is not limited to this.
- Entry position is information indicating the position in the stream of the corresponding packet.
- the “entry position” is, for example, an index value in which the recorded stream head force is also uniquely assigned to each packet (packet number assigned to each packet included in the stream in order from the head of the stream) It is also possible to use the number (size) of the stream head force.
- the number of bytes corresponding to the difference from the previous entry (the size from the beginning of the stream to each random access point, and the adjacent random access point from the beginning of the stream) (The difference from the size up to the random access point) may be used.
- the index value corresponding to the difference between the previous entry strengths (the packet number (index value) in which the leading force of the stream is also assigned to each packet included in the stream in order) and the packet number of each random access point Or the packet number of a random access point adjacent to each random access point).
- the size of the entire management information can be reduced by using the difference in the number of bytes (relative position information) or the difference in the index value (relative index value) from the adjacent random access point.
- control information instead of storing the position of the control information, the PID described in the control information may be directly described. In this case, it is possible to omit the process of finding the beginning of the control information and decoding it to obtain the PID.
- the entry included in the management information is not limited to the example of FIG. Figure 5 shows another configuration example of entries included in the management information!
- the management information shown in this figure includes an internal, the number of entries, each entry 1, 2,.
- Each entry includes information on entry frame position and control information position.
- one entry is provided for each time at which the head force of a stream recorded as in the ASF format described above is also engraved at a constant time interval.
- the head force of a stream recorded as in the ASF format described above is also engraved at a constant time interval.
- tO, tl,... Equally spaced as shown in the upper right time axis of FIG.
- information indicating random access points on the stream corresponding to each time is stored.
- Interval is information indicating the time interval between times tO, tl,...
- the “entry frame position” in each entry is information indicating the packet position where the video frame corresponding to the entry is included.
- the “control information position” is information indicating a packet position including control information corresponding to the entry. For example, as in the case of FIG. 4, the information indicating the entry frame position and control information position includes the number of bytes at the head of the stream, the index value of the bucket, and the number of bytes corresponding to the difference between the entries and the index value. You can use the difference!
- the entry position at the desired time can be easily found without looking for the target entry by looking at the display time inside the entry. For this reason, the target random access point can be obtained earlier than in the case of using the entry described in FIG.
- control information may directly describe a PID or the like described in the control information instead of the control information position. This eliminates the process of finding and decoding the beginning of the control information to obtain the PID.
- the entry shown in FIG. 5 and the entry corresponding to the random access point explained in FIG. instead of the control information described inside and the position of the random access point, the identification information (first entry) of the entry corresponding to one-to-one may be stored in the random access point.
- the index of the corresponding entry and the number of bytes from the beginning of the entry can be used as the identification information of the entry corresponding to the random access point on a one-to-one basis.
- a random access corresponding to the desired playback time is used by using an “interval” (second entry including a pointer to the first entry) corresponding to the playback time of the random access point.
- the point can be analyzed, and the position of the random access point from which playback can be started can be determined based on the analysis result and the first entry. Therefore, this makes it possible to quickly find information on the location of the desired random access point.
- Recording control unit 105 to which management information is input from management information generating unit 103, records the input management information and the stream input from reception control unit 106 on recording medium 104 (S10). .
- FIG. 6 (a) to FIG. 6 As the format of the management information recorded on the recording medium 104, for example, FIG. 6 (a) to FIG.
- Fig. 6 (a) has a format in which the number of entries is stored first, and then all the entries are stored side by side.
- entries to be stored those already described with reference to FIGS. 4 and 5 can be considered.
- Fig. 6 (b) shows that one entry (for example, the first entry) and another entry (for example, the second entry)
- Fig. 6 (b) shows that one entry (for example, the first entry) and another entry (for example, the second entry)
- the number of control information is stored first, followed by storing all control information (entries related to control information) side by side, and then storing the number of entries other than the control information. Subsequently, all entries other than the control information are stored side by side. That is, in the example of FIG. 6 (c), all the control information related to the stream is arranged at the head, and then entries other than the control information (for example, the entries of FIG. 4) are arranged.
- FIG. 6 (c) can also be regarded as a derived format of FIG. 6 (a).
- invalid data may be added to each packet in order to take an attribute for reasons such as the sector size.
- control information such as PID may be written in the added area as shown in FIG.
- a management information multiplexing unit (not shown) is provided before the recording control unit 105 for recording the stream and management information on the recording medium 104, and this management information multiplexing is performed.
- the stream and the management information may be multiplexed by the unit.
- the control information decoding unit 102 decodes the control information included in the stream, and the random access information analysis unit 101 is included in the stream.
- the control is performed by analyzing the position of the random access point of the recorded media using the control information and decoded by the control information decoding unit 102 by the management information generating unit 103.
- management information for managing a plurality of random access points included in the stream is generated.
- the management information generated in this way is recorded on the recording medium 104 together with the stream.
- the stream and the management information can be managed in a unified manner, and can be used for IJ. Therefore, when a stream recorded in this way is played back by random access, even if the control signal is inserted periodically, playback can be started quickly.
- FIG. 8 is a block diagram showing a configuration of a data reproducing device 800 that is a reproducing device according to the present embodiment.
- the data reproducing apparatus 800 reproduces the recording medium 104 on which the stream and the management information are recorded by the data recording apparatus 100 described in the first embodiment.
- the data reproduction device 800 includes a management information analysis unit 802, a stream reading unit 803, a data separation unit 804, a video decoding unit (first media decoding unit) 806, and an audio decoding unit. Section (second media decryption section) 807 and instruction input section 808.
- the management information analysis unit 802 reads the management information recorded on the recording medium 104, and analyzes the read management information power for random access information and the like. Further, the analysis result is output to the stream reading unit 803.
- the stream reading unit 803 reads the stream recorded on the recording medium 104 in response to an instruction from the management information analysis unit 802 (analysis result of the management information analysis unit 8002). In addition, the read stream is output to the data separation unit 804.
- the data separation unit 804 separates the packets included in the stream read by the stream reading unit 803 using the PI information that is input from the control information decoding unit 805 (described later). Packets containing compressed data and control information are separated.)
- the control information decoding unit 805 decodes the packet including the control information, and performs video or audio PI. Get information such as D. Also, as described above, the acquired PI information is output to the data separation unit 804.
- the video decoding unit 806 decodes the compressed video data separated by the data separation unit 804, and displays it on video output means such as a display (not shown).
- the audio decoding unit 807 decodes the compressed audio data separated by the data separation unit 804 and outputs the decoded data to an audio output unit such as a spinning force (not shown).
- video and audio are decoded has been described here, the present invention is not limited to this, and either video or audio may be used. Further, for example, it may be configured to include a decoding unit for other media such as still images and data.
- the instruction input unit 808 receives an instruction relating to a position to start reproduction and user input relating to the reproduction start instruction and transmits a signal corresponding to the instruction input to the management information analyzing unit 802 It is.
- the configuration of the instruction input unit 808 is not particularly limited, and may be, for example, a touch panel or a keyboard, a mouse pointer, a pen input device, a jog dial, or the like. Further, a configuration in which the user designates the reproduction start position based on information displayed on a display unit (not shown) may be used. For example, the configuration may be such that the seek start position is specified by operating the seek bar displayed on the display means with a mouse pointer or the like.
- reproduction is started based on an instruction regarding the reproduction start position input by the user via the instruction input unit 808.
- the user can set playback to start (restart) from the position where playback was previously stopped (playback interruption position), or select a point to play using a seek bar, etc., and instruct the player to play that position.
- “replay a file with any position force” means, for example, storing information on the point where the previous playback was stopped and playing from that position, or when the user played on the seek bar, For example, select and play a point. Also, when playing back the file at the beginning, it is one special case of “When playing a file from an arbitrary position”. It is possible to realize.
- FIG. 15 is a flowchart showing the flow of processing at the start of playback in the data playback device 800.
- a description will be given of a case where the above-described entry having the constituent power shown in FIG. 4 is stored in the recording medium 104 in the format shown in FIG. 6 (a).
- the present invention is not limited to this.
- the configuration shown in FIG. 5 may be used, and the formats shown in FIGS. 6B, 6C, and 7 may be used.
- the management information analysis unit 802 reads the management information recorded on the recording medium 104 when an instruction regarding the reproduction start position and a reproduction start instruction are input to the instruction input unit 808 (S21). (S22).
- the management information analysis unit 802 extracts an entry whose entry type is video from the read management information (S23), and further, the content of the extracted entry corresponds to the time when playback is desired to start.
- the entry is searched (S24), and the playback start position of the video frame is determined (S25).
- the unit of information and the content of the information may differ between the information on the time at which playback is to be started and the information on the time stored in the entry.
- the time at which playback is to be started is expressed as the relative time of the beginning force of the file in ms (millisecond) units, and the time force stored in the entry is stored as the absolute time in 90 kHz units called PTS described above
- PTS 90 kHz units
- entries of video frames generally exist at intervals of several seconds. For this reason, there are many cases where there is no video frame entry at the same time as the time at which playback is to be started. If there is no video frame entry at the same time, for example, the video frame entry before and after the time at which playback is to be started may be selected. , The entry just before the time you want to start playback (playback started V, the nearest entry of the entry ahead of time, or the entry) may be selected! The former has the merit that playback is started even when the position force is close in time, and the latter has the merit that video of the time at which playback is to be started is always played.
- the management information includes an entry (first entry) including information on the position of the random access point, and an entry (second entry) including information corresponding to the reproduction time of the random access point on a one-to-one basis. ;
- An entry including a pointer to the first entry) the second entry is used to analyze the random access point corresponding to the playback time at which playback is to be started.
- the position of the random access point at which playback starts can be specified. In this case, there is no need to directly search for the first entry corresponding to the target playback time, the position of the random access point can be easily found based on the second entry, and playback can be started quickly.
- the management information includes information on the number of bytes (size) from the beginning of the stream of each random access point, the information may be used to analyze the position of the random access point. .
- the position of the random access point may be analyzed based on the index value and the size of each packet. . For example, by multiplying the random access point index value corresponding to the time you want to start playback and the size of each packet, you can specify the position of the random access point where playback started!
- the management information includes the difference between the head strength of the stream and the size of each random access point and the size from the head of the stream to the random access point adjacent to each random access point). If it is included, the position of the random access point may be analyzed based on this relative position information. For example, by starting the playback of the stream, by adding the relative position information of each random access point up to the random access vote corresponding to the time, the location of the random access point that started playback is specified. What should I do?
- the index value (packet number) of each random access point When the difference (relative index value) with the index value of the random access point adjacent to each random access point is included, the position of the random access point may be analyzed based on the relative index value. For example, when the start power of the stream is also played, the relative index value of each random access point up to the random access vote corresponding to the time is added, and the result is multiplied by the size of each packet. Once started, the location of the random access point can be specified.
- the management information analysis unit 802 enters the control information entry corresponding to the determined video frame entry. (S26), and notifies the stream reading unit 803 of the entry of the determined control information. Here, select the control information entry that is closest in time to the video frame entry.
- the stream reading unit 803 refers to the entry position of the control information determined by the management information analysis unit 802, reads the position of the stream (S27), and outputs the read stream to the data separation unit 804.
- the data separation unit 804 separates the control signal included in the stream input from the stream reading unit 803 and outputs the control signal to the control information decoding unit 805 (S28).
- the control information decoding unit 805 decodes the control signal input from the data separation unit 804 (S29). As a result, the PID of the packet containing each media such as video, audio, and data can be known (see Fig. 3).
- control information decoding section 805 outputs Pro information included in the decoded control signal to data separating section 804 (S30). As a result, the data separation unit 804 can correctly separate the media.
- the data separation unit 804 separates the stream input from the stream reading unit 803 for each medium based on the Pro information input from the control information decoding unit 805 (S31). Then, the packet of each separated media is output to the decoding unit that decodes each media (S32). That is, the data separation unit 804 outputs the compressed video data to the video decoding unit 806, and outputs the compressed audio data to the audio decoding unit 807. [0135] Then, each decoding unit decodes each medium, and outputs the decoded result to the output unit of each medium (S33). That is, the video decoding unit 806 decodes the compressed data of the video separated by the data separation unit 804 and displays it on video output means such as a display (not shown). Also, the audio decoding unit 807 decodes the compressed audio data separated by the data separation unit 804 and outputs it to audio output means such as a speaker (not shown).
- the management information analysis unit 802 refers to the entry position of the video frame, reads the stream by the stream reading unit 803 from the position, and the data separation unit 804 separates the data for each medium and separates it. The process of outputting the data to the decryption unit of each medium may be continued. As a result, video and audio can be reproduced.
- reading may be continued as it is after reading the control information. In this case, it is preferable to perform control so that the video decoding unit 806 does not start decoding until the next key frame.
- the management information analysis unit 802 may search for the control information entry in which a value indicating that the broadcast suspension has been canceled is set, and the entry position power reproduction may be performed. This avoidance of the broadcast pause state portion may be performed in the same manner even when the broadcast pause state is recognized during playback immediately after the start of playback. In other words, when the broadcast pause state is recognized during playback, the management information analysis unit 802 searches for the control information entry in which a value indicating that the broadcast pause has been canceled is set, and plays back from that point. The process of resuming the process may be performed.
- the data recording apparatus 100 instead of storing the position of the control information in the entry, it may be possible to directly describe the PID described in the control information.
- all the PIDs may be acquired by the management information analysis unit 802, and the PHD information may be notified from the management information analysis unit 802 to the data separation unit 804.
- the search of the control information in the data separation unit 804 and the control information in the control information decoding unit 805 are performed.
- the process of decoding can be omitted. Therefore, as shown in FIG. 9, the control information decoding unit 805 can be omitted.
- the present invention is not limited to this.
- the same PI and blue information are separated from both the management information analysis unit 802 and the control information decoding unit 805. Let's notify part 804.
- the PID directly described in the entry is only a part of the PID such as video and audio.
- the PID obtained by the management information analysis unit 802 is notified from the management information analysis unit 802 to the data separation unit 804, and other PIDs are obtained by the control information decoding unit 805 and sent to the data separation unit 804. It may be configured to notify.
- the management information analysis unit 802 and the control information decoding unit 805 both notify the data separation unit of the same PI information. It is good.
- N-times playback is realized by thinning out video frames and transferring them to the video decoding unit 806.
- the video decoding unit 806 in fast forward, Fl, F 2, F3, F4, F5, F6, F7, F8, F9 jl concealment [this video decoding 806 [this transfer and fast reverse] F7, F8, F9, F4, F5, F6, Fl, F2, F3 jl concealment.
- two non-key frames are transferred following the key frame, but this is not restrictive.
- the number of non-key frames transferred to the video decoding unit 806 may be calculated every time according to the magnification (value of N), the time interval of the key frames, or the non-key frames transferred uniformly from the magnification. The number may be determined. Also, it is not always necessary to transfer all key frames. For example, after Fl and F2, control may be performed such that F7 and F8 are transferred without transferring the F4 key frame.
- the video decoding unit 806 which does not simply thin out the video frames, ignores the time information and performs display at a predetermined frame rate, or displays the video display time information at an appropriate time. By rewriting it and transferring it to the video decoding unit 806, it is possible to realize fast forward Z fast reverse reproduction at a desired magnification.
- the management information analysis unit 802 determines the position of the random access point based on the management information recorded together with the stream on the recording medium 104.
- the stream reading unit 804 reads the stream recorded on the recording medium 104 based on the position of the random access point analyzed by the management information analyzing unit 8002. Then, the data separation unit 804 separates the packet including the control information from the packet including the media, and the video decoding unit (first media decoding unit) 806 and the audio decoding unit (second media decoding unit) 807 are the media. Packets containing (video, audio) are decoded.
- the position of the random access point is analyzed based on the management information recorded together with the stream on the recording medium, and the stream is read based on the analysis result! Information can be obtained quickly. For this reason, even a stream in which control signals are periodically inserted can be quickly started to be reproduced.
- a management information separation unit (not shown) for separating the management information multiplexed in the stream is provided in the preceding stage of the management information analysis unit 802. It may be provided.
- the management information and the stream can be separated and the position of the random access point can be quickly analyzed based on the separated management information.
- the data recording device 100 and the data reproducing device 800 are described as independent configurations. However, the present invention is not limited to this, and the data recording device 100 and the data reproducing device are not limited thereto.
- a configuration (recording / reproducing device) including both the device 800 is also possible.
- the stream and its management information are recorded on the recording medium 104 during recording, and the random access point position is analyzed based on the management information recorded together with the stream on the recording medium 104 during playback. Control information based on the analysis result can be obtained quickly. For this reason, the stream recorded on the recording medium can be quickly reproduced.
- each member is a function block realized by executing a program code stored in a recording medium such as a ROM or a RAM such as a CPU. Therefore, an object of the present invention is to provide a recording medium on which a program code (execution format program, intermediate code program, source program) of a program that is software that realizes the function of each member described above is recorded so as to be readable by a computer. This can be achieved by supplying the system or apparatus and reading and executing the program code recorded on the recording medium by the computer (or CPU) provided in the system or apparatus.
- a program code execution format program, intermediate code program, source program
- each of these members may be realized as hardware that performs the same processing as the software described above.
- an object of the present invention is to provide each member (random access information analysis unit 101, control information decoding unit 102, management information generation unit 103, recording control unit 105, reception control unit) which is hardware included in the data recording device 100. 106), and each member (management information analysis unit 802, stream reading unit 803, data separation unit 804, video decoding unit 806, audio decoding unit 807) that are hardware included in the data reproduction device 800, etc.
- These members are also realized as a combination of hardware that performs part of the processing and arithmetic means that executes program code that performs processing other than control of the hardware and processing performed by the hardware. it can.
- the calculation means may have a single configuration, or a configuration in which a plurality of calculation means connected via a bus or various communication paths in the apparatus cooperate to execute a program code. It may be.
- the random access information analysis unit 101, the control information decoding unit 102, the management information generation unit 103, the recording control unit 105, and the reception control unit 106 described above are provided in any place in the data recording device 100. be able to. Further, the management information analysis unit 802, the stream reading unit 803, the data separation unit 804, the video decoding unit 806, and the audio decoding unit 807 can be provided in any place in the data reproduction device 800.
- the program code itself that can be directly executed by the arithmetic means, or a program as data that can generate a program code by a process such as decompression described later, is the program (the program or the data). It is stored in a recording medium and distributed, or the program is distributed by being transmitted by a communication means for transmission via a wired or wireless communication path, and is executed by the arithmetic means. Shall be executed.
- the above-mentioned program is transmitted via the communication path when various transmission media constituting the communication path propagate a signal sequence indicating a program.
- the transmission device may superimpose the signal sequence on the carrier by modulating the carrier with a signal sequence indicating a program. In this case, the signal sequence is restored by the receiving device demodulating the carrier wave.
- the transmission device may divide the signal sequence as a digital data sequence into packets. In this case, the receiving apparatus concatenates the received packet groups and restores the signal sequence.
- the transmission device may multiplex and transmit the signal sequence with another signal sequence by a method such as time division Z frequency division Z code division.
- the receiving apparatus extracts and restores this signal sequence from the multiplexed signal sequence. In either case, the same effect can be obtained if the program can be transmitted through the communication path.
- the recording medium for distributing the program is removable, but it does not matter whether the recording medium after distributing the program is removable.
- the recording medium can be any medium that records the program. It does not matter whether it can be rewritten (written) or not volatile, and the recording method and shape are not questioned. Examples of such recording media include tapes such as magnetic tape and cassette tape, magnetic disks such as floppy (registered trademark) disks and hard disks, CD-ROMs, magneto-optical disks (MO), mini-discs (MD), A disc such as a digital video disc (DVD).
- the recording medium may be a card such as an IC card or an optical card, or a semiconductor memory such as a mask ROM, EPROM, EEPROM, or flash ROM. Alternatively, it may be a memory formed in a calculation means such as a CPU.
- the program code may be a code for instructing the arithmetic means of all the processes of the respective members, or may be a part of the processes of the respective members by calling in a predetermined procedure. If a basic program (for example, operating system or library) that can execute all of the program already exists, the basic program can be called by a code or pointer that instructs the arithmetic unit. Or you can replace everything.
- a basic program for example, operating system or library
- the format for storing the program in the recording medium may be a storage format that can be accessed and executed by the computing means, for example, in a state where the program is stored in the real memory. From the storage format after installation on a local recording medium (for example, real memory or a node disk) that is always accessible by the computing means before being placed in the memory, or from a network or transportable recording medium, It may be in the storage format before installing on the local recording medium.
- a local recording medium for example, real memory or a node disk
- the program may be stored in the recording medium as source code that is not limited to the compiled object code, or as intermediate code generated during the interpretation or compilation. In any case, by decompressing the compressed information, decompressing the encoded information, interpreting, compiling, linking, or placing in real memory, or a combination of these, If the intermediate code can be converted into a format that can be executed by the arithmetic means, the same effect can be obtained regardless of the format in which the program is stored in the recording medium.
- the recording apparatus of the present invention receives a powerful stream such as compressed video data.
- the stream composed of a plurality of packets is input, the control information decoding unit for decoding the control information in the stream, and the position of the random access point of the media included in the stream
- a random access information analysis unit that analyzes using the control information and information included in the stream, the control information, a management information generation unit that generates position management information of the random access point, and the stream
- a recording medium capable of holding the management information, and the management information includes a plurality of types of random access point information in the stream.
- control information included in the stream and the location and type of each random access point of the media are stored as management information, so that both information can be managed and used in a unified manner. .
- management information information indicating a plurality of types of random access points included in the stream can be recorded in the management file.
- the recording apparatus of the present invention receives a powerful stream such as compressed video data, and the recording apparatus for recording the stream receives the stream composed of a plurality of packets as input, and controls information in the stream.
- a control information decoding unit that decodes the position of a random access point of media included in the stream using the control information and information included in the stream, and the control information
- a management information generation unit that generates positional management information of the random access point, a management information multiplexing unit that multiplexes the management information and the packet, and a recording medium that can hold the multiplexed stream.
- the management information includes information on a plurality of types of random access points in the stream. It can also be expressed as a device.
- control information can be added to a stream and recorded, so there is no need to distinguish between control information and a random access point of media.
- the recording apparatus of the present invention is configured such that, in the above configuration, the management information includes a plurality of entries, and each entry includes information such as the type, position, and playback time of a random access point. You can also
- the random access points of each medium included in the stream If the entry is included in the management information the size of the management information can be reduced.
- the management information includes a first entry including information such as a type and a position of a random access point, and a pointer to the first entry. It can also be configured with a second entry.
- the recording apparatus of the present invention may be configured such that, in the above configuration, the management information includes a PID necessary for reproducing the media included in the stream.
- the step of decoding the control information can be omitted.
- the recording apparatus of the present invention may be configured such that, in the above configuration, the size of the stream head force is used as information indicating the position of the random access point.
- the recording apparatus of the present invention may be configured such that, in the above configuration, the packet number of the stream head force is used as information indicating the position of the random access point.
- the packet position corresponding to the random access point can be easily found.
- the recording apparatus of the present invention has a configuration in which, in the above configuration, a difference in size from an adjacent entry included in the management information is used as information indicating the position of the random access point. Monkey.
- the recording apparatus of the present invention may be configured to use a difference in packet number with an adjacent entry included in management information as information indicating the position of the random access point. it can.
- the playback device of the present invention reads the stream recorded on the recording medium and its management information, and plays back the media such as video and audio in the management information.
- Reporting power A management information analysis unit that analyzes information on a random access point, a stream reading unit that reads out a stream that also has a stream force in a recording medium based on the information on the random access point, and a read stream
- a data separation unit that separates control information, video information, and audio information
- a control information decoding unit that extracts control information necessary for the data separation process from the control information
- the separated video information and audio information
- the management information includes a video decoding unit and an audio decoding unit
- the management information includes information on a plurality of types of random access points in the stream.
- the start position of the key frame and the corresponding control information can be quickly obtained by analyzing the management file, and the stream force can also be obtained quickly so that the control information can be obtained quickly.
- the start of content playback can be accelerated.
- the position of control information such as PID and key frame information necessary for starting playback can be obtained quickly, and the start of playback can be accelerated.
- the playback apparatus of the present invention reads a stream recorded on a recording medium and management information thereof, and plays back media such as video and audio in a management information separation unit that separates management information from the stream And a management information analysis unit that analyzes information on the management information power random access point, and information on the random access point
- a stream reading unit that reads a stream that is a target of stream force in the recording medium, a data separation unit that separates the read stream into control information, video information, and audio information, and the control information force
- a control information decoding unit that extracts control information necessary for processing; a video decoding unit that decodes the separated video information and audio information; and an audio decoding unit. It can also be expressed as a playback device characterized by including information on random access points.
- the control information necessary for detecting the key frame can be quickly obtained when the stream power is read out, and therefore the key frame analysis process is accelerated and the reproduction start of the recording content is accelerated. be able to.
- the management information analysis unit includes a plurality of entry forces, and each entry includes a type, a position, and a playback time of a random access point.
- the management information including such information can also be configured to be analyzed.
- the management information analysis unit includes a first entry including information such as a type and a position of a random access point, and a pointer to the first entry.
- the management information having the second entry is analyzed, the second entry such as time information is analyzed, and then the first entry is analyzed to obtain information on the random access point. Monkey.
- the management information analysis unit analyzes control information directly described in management information
- the data separation unit is configured to manage the management information analysis unit. It is also possible to adopt a configuration in which data separation processing is performed using the control information obtained in (1).
- the playback device of the present invention is configured such that the stream reading unit reads the target stream from the random access point described in the management information using the size information from the top. You can also
- the stream reading unit sets the position of the packet including the random access point described in the management information for the target stream to the packet number from the head.
- a configuration obtained by multiplying the size can also be adopted.
- the stream reading unit describes, in each entry included in the management information, a random access point in which the target stream is described in the management information.
- the relative position information is obtained by adding the leading force. Say it with a word.
- the stream reading unit includes, in each entry included in the management information, a position of a packet including a random access point described in the management information of the target stream It is also possible to add the relative index values described in (1) from the beginning and multiply this by the packet size.
- the recording / reproducing apparatus of the present invention receives a powerful stream such as compressed video data, and the recording / reproducing apparatus for recording the stream receives the stream composed of a plurality of packets as an input.
- a control information decoding unit that decodes control information
- a random access information analysis unit that analyzes a position of a random access point of media included in the stream using the control information and information included in the stream, and the control Information
- a management information generating unit that generates positional management information of the random access point
- a recording medium capable of holding the stream and the management information, and information on the recorded management information random access point.
- the recorded A stream reading unit that reads a stream that is also a target of stream power, a data separation unit that separates the read stream into control information, video information, and audio information, and control information that is necessary for the data separation process from the control information Control information decoding unit, a video decoding unit that decodes the separated video information and audio information, and an audio decoding unit, and the management information is information on a plurality of types of random access points in the stream. It can also be expressed as a recording / reproducing device characterized by including
- the management information includes the control information included in the stream and the location and type of each random access point of the media, so the information of both is managed and used in a unified manner.
- the start position of the key frame and the corresponding control information can be quickly obtained by analyzing the management file, and stream force control information can be obtained quickly. You can speed up the playback of content.
- the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Such embodiments are also included in the technical scope of the present invention. Industrial applicability
- the present invention can be applied to a recording apparatus that records a stream composed of a plurality of packets, a reproducing apparatus that reproduces the stream, a recording apparatus that includes the recording apparatus, and the reproducing apparatus.
- the recording media used in these recording devices, playback devices, and recording / playback devices are not particularly limited, for example, tape systems such as magnetic tapes and cassette tapes, magnetic disks such as flexible disks and hard disks, CDZMOZMDZDVD, etc.
- Disk systems such as disk, IC cards (including memory cards), etc., or semiconductors such as mask ROM, EPRO M (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. It may be a memory system.
- the stream is recorded on a transmission medium (medium that holds data fluidly) such as a communication network including the Internet (connected to a wired line or a wireless line), or a stream to which these transmission medium powers are also input. It may be regenerated.
- a transmission medium medium that holds data fluidly
- a communication network including the Internet (connected to a wired line or a wireless line), or a stream to which these transmission medium powers are also input. It may be regenerated.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Management Or Editing Of Information On Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (4)
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BRPI0609951-3A BRPI0609951A2 (pt) | 2005-04-25 | 2006-04-19 | aparelho de gravação, aparelho de reprodução, aparelho de gravação/reprodução, programa de gravação e meio de armazenamento dos mesmos e programa de reprodução e meio de armazenamento dos mesmos |
EP06745472.8A EP1876818B1 (en) | 2005-04-25 | 2006-04-19 | Playback apparatus |
JP2007514632A JP4579290B2 (ja) | 2005-04-25 | 2006-04-19 | 記録装置、記録媒体の製造方法、管理情報の製造方法、再生装置、再生方法、およびプログラム |
US11/912,387 US8494342B2 (en) | 2005-04-25 | 2006-04-19 | Recording apparatus, reproducing apparatus, recording/reproducing apparatus, recording program and storage medium thereof, and reproduction program and storage medium thereof |
Applications Claiming Priority (2)
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JP2005-127133 | 2005-04-25 | ||
JP2005127133 | 2005-04-25 |
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US (1) | US8494342B2 (ja) |
EP (1) | EP1876818B1 (ja) |
JP (1) | JP4579290B2 (ja) |
KR (2) | KR100952547B1 (ja) |
CN (2) | CN102780931B (ja) |
BR (1) | BRPI0609951A2 (ja) |
WO (1) | WO2006115151A1 (ja) |
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JP2008205521A (ja) * | 2007-01-24 | 2008-09-04 | Sanyo Electric Co Ltd | 記録装置及び方法、および再生装置及び方法 |
JP2013034226A (ja) * | 2012-09-26 | 2013-02-14 | Canon Inc | 情報送信装置、その制御方法及びプログラム |
WO2015166817A1 (ja) * | 2014-04-30 | 2015-11-05 | ソニー株式会社 | 情報処理装置、情報記録媒体、および情報処理方法、並びにプログラム |
CN105553611A (zh) * | 2015-12-09 | 2016-05-04 | 豪威科技(上海)有限公司 | 数据包解码***及方法 |
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MX2008013185A (es) * | 2006-05-03 | 2008-10-21 | Ericsson Telefon Ab L M | Metodo y aparato para la reconstruccion de medios a partir de una representacion de medios. |
US8126048B2 (en) * | 2008-03-18 | 2012-02-28 | Seiko Epson Corporation | Recording streaming delta-encoded data |
JP4679609B2 (ja) | 2008-06-05 | 2011-04-27 | 株式会社東芝 | 映像収録再生装置、映像収録方法及び映像再生方法 |
JP4686587B2 (ja) * | 2008-10-16 | 2011-05-25 | 株式会社東芝 | 映像記録再生装置およびファイル管理方法 |
KR20100134868A (ko) * | 2009-06-16 | 2010-12-24 | 삼성전자주식회사 | 비디오 파일 제공 시스템 및 방법 |
US9781188B2 (en) * | 2010-11-02 | 2017-10-03 | Lg Electronics Inc. | Method for transreceiving media content and device for transreceiving using same |
JP5699812B2 (ja) * | 2011-05-31 | 2015-04-15 | 船井電機株式会社 | 再生装置 |
US8989280B2 (en) * | 2011-06-30 | 2015-03-24 | Cable Television Laboratories, Inc. | Frame identification |
US8995460B1 (en) * | 2012-05-14 | 2015-03-31 | Arris Enterprises, Inc. | Embedded control data in communications systems |
US10104406B2 (en) * | 2013-06-21 | 2018-10-16 | Saturn Licensing Llc | Transmission apparatus, transmission method, reproduction apparatus, reproduction method and reception apparatus |
JP6498882B2 (ja) * | 2013-07-22 | 2019-04-10 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカPanasonic Intellectual Property Corporation of America | 蓄積方法、再生方法、蓄積装置、および再生装置 |
JP6426901B2 (ja) * | 2014-03-14 | 2018-11-21 | 富士通クライアントコンピューティング株式会社 | 配信方法、再生装置、配信装置、転送制御プログラムおよび配信制御プログラム |
JP6102825B2 (ja) * | 2014-05-30 | 2017-03-29 | カシオ計算機株式会社 | 動画データ再生装置、動画データ再生方法及びプログラム |
CN109660549A (zh) * | 2018-12-29 | 2019-04-19 | 贵阳朗玛信息技术股份有限公司 | 一种视频帧数据包发送、接收方法及装置 |
WO2020183900A1 (ja) * | 2019-03-11 | 2020-09-17 | ソニー株式会社 | 情報処理装置、再生処理装置、情報処理方法及び再生処理方法 |
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- 2006-04-19 US US11/912,387 patent/US8494342B2/en not_active Expired - Fee Related
- 2006-04-19 EP EP06745472.8A patent/EP1876818B1/en not_active Expired - Fee Related
- 2006-04-19 JP JP2007514632A patent/JP4579290B2/ja active Active
- 2006-04-19 CN CNA2006800138763A patent/CN101164337A/zh active Pending
- 2006-04-19 WO PCT/JP2006/308240 patent/WO2006115151A1/ja active Application Filing
- 2006-04-19 KR KR1020097024648A patent/KR100952547B1/ko active IP Right Grant
- 2006-04-19 BR BRPI0609951-3A patent/BRPI0609951A2/pt active Search and Examination
- 2006-04-19 KR KR1020077024356A patent/KR100941248B1/ko active IP Right Grant
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Also Published As
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EP1876818B1 (en) | 2019-03-13 |
KR100941248B1 (ko) | 2010-02-10 |
KR100952547B1 (ko) | 2010-04-12 |
US20090074382A1 (en) | 2009-03-19 |
KR20070120169A (ko) | 2007-12-21 |
EP1876818A1 (en) | 2008-01-09 |
BRPI0609951A2 (pt) | 2010-05-11 |
CN102780931A (zh) | 2012-11-14 |
KR20090127197A (ko) | 2009-12-09 |
JP4579290B2 (ja) | 2010-11-10 |
EP1876818A4 (en) | 2013-07-31 |
CN102780931B (zh) | 2015-02-11 |
CN101164337A (zh) | 2008-04-16 |
JPWO2006115151A1 (ja) | 2008-12-18 |
US8494342B2 (en) | 2013-07-23 |
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