JP2008028787A - Data processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data processor which easily reproduces the data of a wanted channel independent of data arrangement. <P>SOLUTION: A controller 20 applies a 4 channel MPEG-PS with a time division multiplexing process to generate a multiplex MPEG-PS, and applies a 4 channel INDEX-S with the same time division multiplexing process to generate a multiplex INDEX-S. The multiplex MPEG-PS is formed with a plurality of GOPs; and the multiplex INDEX-S is formed with a plurality of INDEX blocks. A main CPU24 detects another INDEX block belonging to the same channel as the INDEX block which is interested anew by the controller 20, from the multiplex INDEX-S which is already generated. The main CPU24 calculates a distance from the INDEX block interested by the controller 20 to another INDEX block, and allocates the distance information representing a calculated distance to each of the two INDEX blocks. Thus, by referencing the distance information, the data of a wanted channel is easily reproduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a data processing apparatus, and more particularly to a data processing apparatus that is applied to, for example, a video recording / reproducing apparatus and records data of a plurality of channels on a recording medium through time division multiplexing.

An example of a conventional device of this type is disclosed in Patent Document 1. According to this prior art, input n-channel video data is sequentially recorded on a data recording medium in the manner of channel 1 → channel 2 →... → channel n → channel 1 →. That is, the n-channel video data is recorded on the data recording medium so that videos to be displayed at the same time can be easily reproduced simultaneously.
JP-A-9-182016 [H04N 5/907, 5/68, 5/765]

    However, in other words, the conventional technique has a problem that simple reproduction cannot be performed without considering the arrangement of n-channel video data.

    Therefore, a main object of the present invention is to provide a data processing apparatus capable of easily reproducing data of a desired channel regardless of the data arrangement.

  The data processing device (10: reference numeral corresponding to the embodiment; the same applies hereinafter) according to the first aspect of the invention is an output means (161a, 161b, 161c) that repeatedly outputs a plurality of data blocks respectively belonging to a plurality of channels in parallel with each other. , 161d), a first multiplexing unit (20a) for generating a multiplexed data block by performing time division multiplexing processing on the plurality of data blocks output by the output unit, and managing the plurality of data blocks output by the output unit, respectively A creation means (162a, 162b, 162c, 162d) for creating a plurality of management blocks, and a plurality of management blocks created by the creation means are subjected to time division multiplexing processing in the same manner as the time division multiplexing processing of the first multiplexing means. A second multiplexing means (20b) for generating a multiplex management block, a channel detection means (S27) for detecting a channel to which the management block noticed by the second multiplex means belongs, Block detection means (S37) for detecting another management block belonging to the same channel as the channel detected by the output means from the multiplexed management block generated by the second multiplexing means, and blocks from the management block noted by the second multiplexing means Calculating means (S31, S41, S51) for calculating the distance to the management block detected by the detecting means, and management block and block detection to which distance information indicating the distance calculated by the calculating means is noted by the second multiplexing means An assigning means (S33, S43) assigned to at least one of the management blocks detected by the means is provided.

  The output means repeatedly outputs a plurality of data blocks respectively belonging to a plurality of channels in parallel with each other. The plurality of data blocks output by the output means are subjected to time division multiplexing processing by the first multiplexing means, whereby a multiplexed data block is generated. The creation means creates a plurality of management blocks that respectively manage the plurality of data blocks output by the output means. The plurality of management blocks created by the creation means are subjected to time division multiplexing processing in the same manner as the time division multiplexing processing of the first multiplexing means by the second multiplexing means, thereby generating multiple management blocks.

  The channel to which the management block noticed by the second multiplexing means belongs is detected by the channel detecting means. The block detecting means detects another management block belonging to the same channel as the channel detected by the channel detecting means from the multiplexed management blocks generated by the second multiplexing means. The calculating means calculates the distance from the management block noticed by the second multiplexing means to the management block detected by the block detecting means. The distance information indicating the distance calculated by the calculating means is assigned by the assigning means to at least one of the management block noticed by the second multiplexing means and the management block detected by the block detecting means.

  Thus, the plurality of data blocks created for each of the plurality of channels are subjected to time division multiplexing processing. A plurality of management blocks created for each of the plurality of channels are also subjected to time division multiplexing processing in the same manner. Furthermore, distance information indicating the distance between two management blocks belonging to the same channel is assigned to at least one of the two management blocks. Therefore, by referring to the distance information assigned to the management block, it is possible to easily reproduce the data of the desired channel.

  A data processing device according to a second aspect of the present invention is dependent on the first aspect, wherein the calculating means integrates a numerical value related to the size of the management block for each channel in parallel with the processing of the second multiplexing means (S31). ), And an initializing means (S51) for initializing the integrated value corresponding to the channel detected by the channel detecting means among the plurality of integrated values obtained by the integrating means. Thereby, the distance between two management blocks belonging to the same channel is accurately obtained.

  A data processing device according to a third aspect of the present invention is dependent on the second aspect, wherein the data block is formed by a plurality of data elements each having a variable size, the management block corresponds to each of the plurality of data elements, and each of the data blocks is predetermined. Formed by a plurality of management elements having a size. The data block formed by the variable-size data element is accurately identified by referring to the management block and the distance information assigned thereto.

  The data processing device according to the invention of claim 4 is dependent on claim 3, and the accumulating means obtains a numerical value corresponding to the predetermined size every time a new management element forming a management block noticed by the second multiplexing means is obtained. Accumulate.

  The data processing device according to the invention of claim 5 is dependent on claim 4, and the assigning means assigns the integrated value obtained by the integrating means for the channel detected by the channel detecting means to the new block element as distance information. One numerical value assigning means (S33) is included. As a result, only the data of the desired channel can be reproduced in the reverse direction.

  A data processing device according to a sixth aspect of the invention is dependent on any one of the third to fifth aspects, wherein the calculating means repeatedly subtracts a numerical value corresponding to the predetermined size from the integrated value corresponding to the channel detected by the channel detecting means. Subtracting means (S41) is further included, and the assigning means assigns a plurality of subtraction values obtained by the subtracting means to the plurality of management elements forming the management block detected by the block detecting means, as second distance assigning means. Includes (S43). As a result, it is possible to reproduce only the data of the desired channel in the forward direction.

  The data processing device according to the invention of claim 7 is dependent on claim 6, and further comprises a discriminating means (S29) for discriminating whether or not the new management element is the first management element of the management block, and the subtraction means comprises: When the result of the discriminating means is updated from a negative result to a positive result, a subtraction process is executed.

  A data processing device according to an eighth aspect of the invention is dependent on any one of the third to seventh aspects, wherein each data of a plurality of channels is data representing a moving image, and a data element corresponds to one frame of image data. Thereby, simple double-speed reproduction of moving image data subjected to time-division multiplexing is possible.

  A data processing device according to the invention of claim 9 is dependent on any one of claims 1 to 8, and the first recording means (S5) for recording the multiplexed data block created by the first multiplexing means on the recording medium (30). And second recording means (S49) for recording the multiplexed management block created by the second multiplexing means on the recording medium.

  A data processing device according to a tenth aspect of the present invention is dependent on any one of the first to ninth aspects, and the data block of the designated channel is determined from the multiple data blocks recorded on the recording medium based on the distance information allocated by the allocating means. Block identifying means (S91, S103) to identify, deblocking means (40a, 40b, 40c, 40d) to deblock the data block identified by the block identifying means, and deblocked by the deblocking means Output means (42, 44) for outputting data is further provided.

  The data processing apparatus according to the invention of claim 11 is dependent on any one of claims 1 to 10, and the output means adopts the MPEG system as an encoding system.

  A data processing device according to a twelfth aspect of the present invention is dependent on any one of the first to eleventh aspects of the present invention, and the data of a plurality of channels have different bit rates.

  According to a thirteenth aspect of the present invention, there is provided a data processing program comprising: output means (161a, 161b, 161c, 161d) for repeatedly outputting a plurality of data blocks respectively belonging to a plurality of channels in parallel; and a plurality of data blocks output by the output means A first multiplexing means (20a) for generating a multiplexed data block by performing time-division multiplexing processing, and creating means for creating a plurality of management blocks for managing the plurality of data blocks output by the output means (162a, 162b, 162c, 162d), and a second multiplexing means (20b) for generating a multiple management block by subjecting the plurality of management blocks created by the creating means to time division multiplexing processing in the same manner as the time division multiplexing processing of the first multiplexing means A channel detection unit for detecting a channel to which a management block noticed by the second multiplexing means belongs to the processor (24) of the data processing device (10) comprising: (S27), a block detection step (S37) for detecting another management block belonging to the same channel as the channel detected by the channel detection step from the multiplexed management block generated by the second multiplexing means, and attention by the second multiplexing means The second multiplexing means receives the calculation step (S31, S41, S51) for calculating the distance from the management block to the management block detected by the block detection step, and the distance information indicating the distance calculated by the calculation means A data processing program for executing an allocation step (S33, S43) assigned to at least one of the management block detected by the block detection unit and the management block detected by the block detection means.

  Similar to the first aspect of the invention, data of a desired channel can be easily reproduced.

  The data processing method according to the fourteenth aspect of the invention is directed to output means (161a, 161b, 161c, 161d) for repeatedly outputting a plurality of data blocks respectively belonging to a plurality of channels in parallel with each other, and a plurality of data blocks output by the output means A first multiplexing means (20a) for generating a multiplexed data block by performing time-division multiplexing processing, and creating means for creating a plurality of management blocks for managing the plurality of data blocks output by the output means (162a, 162b, 162c, 162d), and a second multiplexing means (20b) for generating a multiple management block by subjecting the plurality of management blocks created by the creating means to time division multiplexing processing in the same manner as the time division multiplexing processing of the first multiplexing means A data processing method for a data processing apparatus (10) comprising: channel detection for detecting a channel to which a management block noted by a second multiplexing means belongs Step (S27), a block detection step (S37) for detecting another management block belonging to the same channel as the channel detected by the channel detection step from the multiplexed management block generated by the second multiplexing means, and attention by the second multiplexing means The second multiplexing means receives the calculation step (S31, S41, S51) for calculating the distance from the management block to the management block detected by the block detection step, and the distance information indicating the distance calculated by the calculation means And assigning steps (S33, S43) to at least one of the management blocks detected by the block detection means.

  Similar to the first aspect of the invention, data of a desired channel can be easily reproduced.

  According to the present invention, a plurality of data blocks created for each of a plurality of channels are subjected to time division multiplexing processing. A plurality of management blocks created for each of the plurality of channels are also subjected to time division multiplexing processing in the same manner. Furthermore, distance information indicating the distance between two management blocks belonging to the same channel is assigned to at least one of the two management blocks. Therefore, by referring to the distance information assigned to the management block, it is possible to easily reproduce the data of the desired channel.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  Referring to FIG. 1, the hard disk video recorder 10 of this embodiment includes four video input terminals T1 to T4. Four-channel composite video signals output from four surveillance cameras (not shown) are applied to NTSC decoders 12a to 12d via video input terminals T1 to T4, respectively. Each of the NTSC decoders 12a to 12d decodes a given composite video signal and outputs video data.

  Here, the output path from the NTSC decoder 12a corresponds to the channel CH1, and the output path from the NTSC decoder 12b corresponds to the channel CH2. The output path from the NTSC decoder 12c corresponds to the channel CH3, and the output path from the NTSC decoder 12d corresponds to the channel CH4.

  In this embodiment, the frame rate of the video data has a ratio of CH1: CH2: CH3: CH4 = 1: 2: 1: 4. Specifically, the video data of channel CH1 has a frame rate of 15 fps, and the video data of channel CH2 has a frame rate of 30 fps. Further, the video data of channel CH3 has a frame rate of 15 fps, and the video data of channel CH4 has a frame rate of 60 fps.

  When a recording start operation is performed on the operation panel 26, the main CPU 24 activates the recording processing circuit 14 and instructs an HDD (Hard Disk Drive) 28 to newly create an MPEG file on the hard disk 30. The main CPU 24 also creates management data and instructs the HDD 28 to record the created management data on the hard disk 30.

  Referring to FIG. 2, the recording area of hard disk 30 is divided into a management area 30a, an MPEG area 30b, and an INDEX area 30c. A management file for storing management data created by the main CPU 24 is recorded in the management area 30a. In the MPEG area 30b, a plurality of MPEG files # 1, # 2,... Each storing multiple MPEG-PS (described later) created during the period from the recording start operation to the recording end operation are recorded. In the INDEX area 30c, an INDEX file that stores multiple INDEX-S (described later) is recorded.

  The management data stored in the management file has a data structure shown in FIG. According to FIG. 3, the management data includes TAG information, start time information, end time information, MPEG file number, MPEG file start position information, INDEX start position information, and REC information for four channels.

  The start time information indicates the time when the recording start operation is performed. The end time information indicates the time when the recording end operation is performed. The MPEG file number indicates an identification number of a newly created MPEG file. The MPEG file start position information indicates the write start position of a newly created MPEG file. The INDEX start position information indicates the write start position of the multiplexed INDEX-S corresponding to the multiplexed MPEG-PS stored in the newly created MPEG file. The REC information includes the number of frames and frame rate forming a GOP (described later) for each channel.

  The 4-channel video data output from the NTSC decoders 12a to 12d after the recording start operation is supplied to MPEG encoders 16a to 16d forming the recording processing circuit 14, respectively. Referring to FIG. 4, the MPEG encoder 16a (16b to 16d) includes an encoding circuit 161a (161b to 161d) and an INDEX creation circuit 162a (162b to 162d). The encoding circuit 161a (161b to 161d) performs encoding processing according to the MPEG system on the given video data, and outputs MPEG-PS composed of a plurality of video frames. On the other hand, the INDEX creation circuit 162a (162b to 162d) generates an INDEX-S for managing the MPEG-PS generated by the encoding circuit 161a (161b to 161d).

  That is, INDEX-S created by the INDEX creation circuit 162a corresponds to MPEG-PS created by the encoding circuit 161a, and INDEX-S created by the INDEX creation circuit 162b is MPEG generated by the coding circuit 161b. -Corresponds to PS. The INDEX-S created by the INDEX creation circuit 162c corresponds to the MPEG-PS created by the encoding circuit 161c, and the INDEX-S created by the INDEX creation circuit 162d is the MPEG generated by the encoding circuit 161d. -Corresponds to PS.

  The MPEG-PS and INDEX-S output from the MPEG encoder 16a are written into the encoder buffer 18a, and the MPEG-PS and INDEX-S output from the MPEG encoder 16b are written into the encoder buffer 18b. The MPEG-PS and INDEX-S output from the MPEG encoder 16c are written in the encoder buffer 18c, and are written in the MPEG-PS and INDEX-S encoder buffer 18d output from the MPEG encoder 16d.

  Referring to FIG. 5A, the MPEG-PS of each channel is formed by a plurality of packs, and each pack includes a pack header, a system header, and a plurality of PES packets. In the MPEG format, three frame types of I frame, B frame, and P frame are defined, and each of a plurality of packs corresponds to an I frame, a B frame, or a P frame. Therefore, PES packets forming one video frame do not straddle different packs. An I frame is created every 15 frames, and one GOP (Group Of Pictures) is formed by 15 video frames starting from the I frame.

  As described above, the frame rate of the video data is 15 fps, 30 fps, 15 fps, and 60 fps for channels CH1, CH2, CH3, and CH4, respectively. Therefore, 1 GOP forming the MPEG-PS of the channel CH1 corresponds to 1.0 second, and 1 GOP forming the MPEG-PS of the channel CH2 corresponds to 0.5 second. Further, 1 GOP forming the MPEG-PS of the channel CH3 corresponds to 1.0 second, and 1 GOP forming the MPEG-PS of the channel CH4 corresponds to 0.25 second.

  Referring to FIG. 5B, INDEX-S is formed by a plurality of INDEX frames each having basic information of 24 bytes, and one INDEX frame is assigned to one video frame. That is, the plurality of video frames forming the MPEG-PS are respectively managed by the plurality of INDEX frames forming the INDEX-S. The 15 INDEX frames corresponding to the above-mentioned 1 GOP are defined as “INDEX blocks”.

  The 24-byte basic information includes frame size information indicating the size of the corresponding video frame, frame type information indicating the type of the corresponding video frame, time information indicating the time when the corresponding video frame was created, and the corresponding video frame. The PTS and the MPEG offset indicating the distance from the beginning of the MPEG file of the corresponding video frame are described.

  The controller 20 shown in FIG. 1 includes an MPEG-PS multiplexing circuit 20a and an INDEX multiplexing circuit 20b as shown in FIG. The MPEG-PS multiplexing circuit 20a performs time-division multiplexing processing for each GOP in consideration of the difference in frame rate between channels on the MPEG-PS stored in the encoder buffers 18a to 18d. Thereby, a multiplexed MPEG-PS is generated. On the other hand, the INDEX multiplexing circuit 20b performs time division multiplexing processing for each INDEX block on the INDEX-S stored in the encoder buffers 18a to 18d. As a result, a multiple INDEX-S is generated.

  The mode or order of the time division multiplexing processing in the INDEX multiplexing circuit 20b is the same as the mode or order of the time division multiplexing processing in the MPEG-PS multiplexing circuit 20a. Therefore, the arrangement order of the plurality of INDEX blocks or the plurality of INDEX frames forming the multiplex INDEX-S matches the arrangement order of the plurality of GOPs or the plurality of video frames forming the multiplex MPEG-PS. The multiplexed MPEG-PS and multiplexed INDEX-S created in this way are stored in the stream buffer 22 frame by frame.

  As described above, the frame rate has a ratio of CH1: CH2: CH3: CH4 = 1: 2: 1: 4. For this reason, the multiplexed MPEG-PS obtained by the GOP unit time-division multiplexing process has the data structure shown in FIG. Referring to FIG. 7, when one GOP belonging to channel CH1 is inserted, next two GOPs belonging to channel CH2 are inserted. Subsequently, one GOP belonging to channel CH3 is inserted, and further four GOPs belonging to channel CH4 are inserted. Thereafter, the same insertion operation is repeated.

  The multiple INDEX-S has a data structure shown in FIG. The INDEX blocks are arranged in an order that follows the arrangement of GOPs forming a multiplexed MPEG-PS. However, 16-byte extension information is added to each INDEX frame, and a total of 40 bytes are allocated to one video frame. In the extended information, an offset XK (K: any one of 1 to 4 channel numbers), an offset YK, an MPEG file number, and a channel number are described.

  A video frame corresponding to the focused INDEX frame is defined as a “focused video frame”, and a GOP to which the focused video frame belongs is defined as a “focused GOP”. Further, among a plurality of GOPs created before the attention GOP, a GOP that belongs to the same channel as the channel to which the attention GOP belongs and is closest to the attention GOP is defined as a “preceding GOP”. Further, among a plurality of GOPs created after the attention GOP, a GOP that belongs to the same channel as the channel to which the attention GOP belongs and is closest to the attention GOP is defined as a “subsequent GOP”.

  Then, as shown in FIGS. 9A and 9B, the offset XK described in the noticed INDEX frame is the distance D1 from the INDEX frame corresponding to the leading video frame of the preceding GOP to the noticed INDEX frame. Indicates. The offset YK described in the noticed INDEX frame indicates a distance D2 from the INDEX frame corresponding to the first video frame of the subsequent GOP to the noticed INDEX frame.

  The channel number described in the noticed INDEX frame is the identification number of the channel to which the noticed video frame belongs. The MPEG file number described in the INDEX frame of interest is the identification number of the MPEG file created in response to the current recording start operation.

  The multiplexed MPEG-PS and multiplexed INDEX-S created in this way are written into the newly created MPEG file on the hard disk 30 and the created INDEX file on the hard disk 30, respectively.

  When the recording end operation is performed by the operation panel 26, the recording processing circuit 14 is stopped, and the writing process to the multiplexed MPEG-PS MPEG file and the writing process to the multiplexed INDEX-S INDEX file are finished. Furthermore, end time information is added to the management data (see FIG. 3).

  In relation to the recording operation, the main CPU 24 executes in parallel processing according to a plurality of tasks including the recording task shown in FIG. 10 and the recording management tasks shown in FIGS. Note that control programs corresponding to these tasks are stored in a flash memory (not shown).

  Referring to FIG. 10, it is determined in step S1 whether or not a recording start operation has been performed. If YES here, the recording processing circuit 14 is activated in step S3, the video recording task is activated in step S5, and the recording management task is activated in step S7. When the recording end operation is performed, the process proceeds from step S9 to step S11 to notify the video recording task and the recording management task of the end of the recording. In step S13, the recording processing circuit 14 is stopped, and then the process returns to step S1.

  With reference to FIG. 11 to FIG. 12, in step S21, the management data shown in FIG. At this time, the end time information is blank. In step S23, “0” is set in each of the offsets X1, X2, X3, and X4. In step S25, it is determined whether or not a new INDEX frame forming the multiplexed INDEX-S has been accumulated in the stream buffer 22. If YES here, the channel number of the accumulated new INDEX frame is detected in step S27. The channel number is set in the variable K. In step S29, it is determined whether or not the accumulated new INDEX frame corresponds to the first video frame of the GOP. If YES, the process proceeds to step S37, and if NO, the process proceeds to step S31.

  In step S31, the numerical values of the offsets X1, X2, X3, and X4 are updated to values obtained by adding 40 bytes to the current value. In the subsequent step S33, the offset XK is described in the additional information forming the new INDEX frame. In step S35, the MPEG file number and the channel number are described in the same additional information. When the process of step S35 is completed, the process returns to step S25.

  In step S37, the preceding GOP of the channel CHK is specified, and in step S39, the variable N is set to “0”. In step S41, a value obtained by subtracting “40 bytes * N” from the offset XK is set as the offset YK. In step S43, the offset YK is described in the additional information of the INDEX frame corresponding to the Nth video frame of the specified preceding GOP.

  In step S45, it is determined whether or not the variable N exceeds “14”. If NO, the variable N is incremented in step S47, and the process returns to step S41. As a result, the offset YK that decreases by 40 bytes is described in the 15 INDEX frames respectively corresponding to the 15 video frames that form the preceding GOP. When the variable N exceeds “14”, the process proceeds to step S 49, and multiple INDEX-S composed of 15 INDEX frames created by repeating the process of step S 43 is written to the hard disk 30.

  In step S51, "-40 bytes" is set in the offset XK. In step S53, it is determined whether or not an end notification is given from the recording task. If “NO” here, the process directly returns to the step S31 while if “YES”, the end time is added to the management data in a step S55, and then, the process returns to the step S31.

  Referring again to FIG. 1, the 4-channel MPEG-PS stored in the same MPEG file in the hard disk 32 is reproduced in parallel. When a desired MPEG file is selected by the operation panel 26, an initialization process is first executed by the main CPU 24.

  Specifically, the management data is read from the management file corresponding to the desired MPEG file, and the REC information of the channels CH1 to CH4 described in the read management data is set in the MPEG encoders 40a to 40d, respectively. . In addition, a single reproduction speed is commonly set for the MPEG encoders 40a to 40d. Further, the multiplex INDEX-S corresponding to the desired MPEG file is read from the INDEX file, and the offsets Y1 to Y4 for four channels described in the head portion of the read multiplex INDEX-S are stored in the registers R1 to R4. Each is set.

  When a reproduction start operation is performed by the operation panel 26, the reproduction processing circuit 32 is activated by the main CPU 24. Each of the MPEG encoders 40a to 40d issues a transfer request to the main CPU 24 at a cycle based on the set REC information and the reproduction speed. The request source channel number is described in the transfer request.

  The main CPU 24 performs low-speed playback processing when the current playback speed is 30 times or less, and performs high-speed playback processing when the current playback speed exceeds 30 times speed. As a result, the video frame corresponding to 1 GOP corresponding to the desired channel or the head video frame of 1 GOP is specified from the desired MPEG file.

  The identified video frame is transferred from the hard disk 30 to the stream buffer 34, and then given to one of the decoder buffers 38a to 38d (specifically, the decoder buffer corresponding to the request source) by the controller 36. The video frame stored in the decoder buffer is decoded by the corresponding MPEG decoder, and the decoded video data is supplied to the multiplexer 42.

  The multiplexer 42 thus multiplexes the 4-channel video data provided from the MPEG decoders 40a to 40d. The multiplexed video data is converted into a composite video signal by the NTSC encoder 44, and the converted composite video signal is output to the monitor 46. As a result, four scenes captured by the four surveillance cameras are displayed in one screen.

  When a speed change operation is performed through the operation panel 26, desired playback speeds are set in the MPEG decoders 40a to 40d. As a result, the movement of the image on the screen changes.

  The main CPU 24 executes a plurality of tasks including the reproduction task shown in FIGS. 13 to 15 in parallel in relation to the reproduction operation. Control programs corresponding to these tasks are also stored in a flash memory (not shown).

  First, in step S61, a desired MPEG file is selected. In step S63, the REC information of the channels CH1 to CH4 described in the corresponding management data is set in the MPEG decoders 40a to 40d, respectively, and a single reproduction speed is commonly set in the MPEG decoders 40a to 40d. In step S65, the registers R1 to R4 are initialized. Specifically, the multiplex INDEX-S corresponding to the desired MPEG file is detected from the INDEX file, and the offsets Y1 to Y4 described at the head portion of the detected multiplex INDEX-S are set in the registers R1 to R4, respectively. .

  If a reproduction start operation is performed, YES is determined in step S67, and the reproduction processing circuit 32 is activated in step S69. In step S71, it is determined whether or not a transfer request has been issued. When a transfer request is issued from any one of the MPEG decoders 40a to 40d, YES is determined in step S71, and the request source channel number is detected. The detected channel number is set in the variable K.

  In step S75, the current playback speed is determined. If the current playback speed is 30 times or higher, the low speed playback process is executed in step S77, while if the current playback speed is less than 30 times the high speed playback process is executed in step S79. Through the processing in step S77 or S79, the video frame of the requested channel is transferred from the hard disk 30 to the stream buffer 34.

  When the process of step S77 or S79 is completed, the process proceeds to step S81, and the video frame stored in the stream buffer 34 is transferred to the decoder buffer corresponding to the requested channel. The transferred video frame is decoded by the MPEG decoder corresponding to the requested channel. As a result, a corresponding image is output from the TV monitor 46.

  In step S83, it is determined whether or not a speed change operation has been performed. If NO, the process proceeds directly to step S87. If YES, a desired reproduction speed is set in each of the MPEG decoders 40a to 40d in step S85. To step S87. In step S87, it is determined whether or not a reproduction end operation has been performed. If NO, the process returns to step S71. If YES, the reproduction processing circuit 32 is stopped in step S89, and the process returns to step S61.

  The low speed reproduction process in step S77 follows a subroutine shown in FIG. First, in step S91, the subsequent GOP of the channel CHK is specified with reference to the offset YK set in the register RK. In step S93, it is determined whether or not the current playback speed is less than 15 times speed. In step S97, it is determined whether or not the current playback speed is 15 times speed.

  If the current playback speed is less than 15 times, the process proceeds from step S93 to step S95, and 15 video frames forming the specified subsequent GOP are transferred from the hard disk 30 to the stream buffer 34. If the current playback speed is 15 times speed, the process proceeds from step S97 to step S99, and the top video frame of the identified subsequent GOP is transferred from the hard disk 30 to the stream buffer 34.

  When the current playback speed exceeds 15 × speed, the process proceeds from step S97 to step S101, and an INDEX frame corresponding to the head frame of the specified subsequent GOP is detected from the INDEX file. In step S103, a subsequent GOP of the same channel CHK is specified with reference to the offset YK described in the detected INDEX frame. In step S105, the first video frame of the subsequent GOP specified in step S103 is transferred from the hard disk 30 to the stream buffer 34.

  When the process of step S95, S99 or S105 is completed, the process proceeds to step S107, and an INDEX frame corresponding to the transferred video frame (first video frame) is detected from the INDEX file. In step S109, the offset YK described in the detected INDEX frame is set in the register RK, and then the process returns to the upper layer routine.

  The high-speed playback process in step S79 follows a subroutine shown in FIG. In step S111, management data corresponding to a desired MPEG file is read from the management file, and REC information for four channels described in the read management data is acquired. In step S113, the frame rate of each channel is detected with reference to the acquired REC information, and in step S115, the offset YK set in the register RK is acquired. In step S117, the video frame to be reproduced next is predicted based on the REC information and the offset YK thus obtained.

  In step S119, an INDEX frame corresponding to the predicted video frame is detected from the INDEX file. In step S121, it is determined whether or not the detected INDEX frame corresponds to the first frame of the GOP of the channel CHK. If NO, the next INDEX frame is detected in step S123, and the process returns to step S121.

  When the first video frame of the GOP of the channel CHK is specified in this way, the process proceeds from step S121 to step S125, and the specified video frame is transferred from the hard disk 30 to the stream buffer 34. In step S127, the offset YK of the INDEX frame detected last is set in the register RK, and then the process returns to the upper layer routine.

  As can be seen from the above description, the encoding circuits 161a to 161d repeatedly output four GOPs (data blocks) belonging to the four channels in parallel with each other. One GOP is formed by 15 video frames (data elements). An MPEG-PS is formed by a plurality of GOPs corresponding to each of the four channels. The MPEG-PS output from each of the encoding circuits 161a to 161d is subjected to time division multiplexing processing in units of GOPs by the MPEG-PS multiplexing circuit 20a, thereby generating a multiplexed MPEG-PS.

  The INDEX creation circuits 162a to 162d create a plurality of INDEX blocks (management blocks) that respectively manage a plurality of GOPs output from the encoding circuits 161a to 161d. One INDEX block is formed by 15 INDEX frames (management elements). One INDEX frame corresponds to one video frame. The INDEX multiplex circuit 20b performs time division multiplex processing in the same manner or order as the time division multiplex processing of the MPEG-PS multiplex circuit 20a on the plurality of INDEX blocks created by the INDEX creation circuits 162a to 162d. Is generated.

  The channel to which the INDEX block noticed by the INDEX multiplex circuit 20b belongs is detected by the main CPU 24 (S27). The main CPU 24 detects another INDEX block belonging to the same channel as the detected channel from the multiplexed INDEX-S generated by the INDEX multiplexing circuit 20b (S37). The main CPU 24 calculates the distance (= offset X, Y) from the INDEX block noticed by the INDEX multiplexing circuit 20b to another INDEX block detected as described above (S31, S41, S51). The distance information indicating the calculated distance is assigned by the main CPU 24 to at least one of the INDEX block noted by the INDEX multiplexing circuit 20b and the INDEX block detected as described above (S33, S43).

  Thus, the plurality of GOPs created for each of the four channels are subjected to time division multiplexing processing. A plurality of INDEX blocks created for each of the four channels are also subjected to time division multiplexing processing in the same manner or order. Further, distance information indicating the distance between two INDEX blocks belonging to the same channel is assigned to at least one of the two INDEX blocks. Therefore, by referring to the distance information assigned to the INDEX block, it is possible to easily reproduce the data of the desired channel.

  In this embodiment, a hard disk is assumed as a recording medium, but a DVD or a large-scale nonvolatile memory may be used instead. In this embodiment, the MPEG method is adopted as the encoding method, but the M-JPEG method or the M-JPEG2000 method may be adopted instead.

It is a block diagram which shows the structure of one Example of this invention. It is an illustration figure which shows an example of the mapping state of the hard disk applied to the FIG. 1 Example. It is an illustration figure which shows an example of the structure of management data. It is a block diagram which shows an example of a structure of the MPEG encoder applied to the FIG. 1 Example. (A) is an illustrative view showing an example of the structure of MPEG-PS, and (B) is an illustrative view showing an example of the structure of INDEX-S. It is a block diagram which shows an example of a structure of the controller of the recording side applied to the FIG. 1 Example. It is an illustration figure which shows an example of the data structure of multiplexed MPEG-PS. It is an illustration figure which shows an example of the structure of multiple | multiplex INDEX-S. (A) is an illustrative view showing an example of a structure of multiplexed MPEG-PS, and (B) is an illustrative view showing an example of a structure of multiplexed INDEX-S. It is a flowchart which shows a part of operation | movement of CPU applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of CPU applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of CPU applied to the FIG. 1 Example. FIG. 12 is a flowchart showing yet another portion of behavior of the CPU applied to the embodiment in FIG. 1. It is a flowchart which shows a part of other operation | movement of CPU applied to the FIG. 1 Example. It is a flowchart which shows a part of other operation | movement of CPU applied to the FIG. 1 Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Hard disk video recorder 14 ... Recording processing circuit 16a-16d ... MPEG encoder 20, 36 ... Controller 22, 34 ... Stream buffer 24 ... Main CPU
30: Hard disk 40a-40d ... MPEG decoder

Claims (14)

Output means for repeatedly outputting a plurality of data blocks respectively belonging to a plurality of channels in parallel;
First multiplexing means for performing time division multiplexing on the plurality of data blocks output by the output means to generate a multiplexed data block;
Creating means for creating a plurality of management blocks each managing a plurality of data blocks output by the output means;
Second multiplexing means for generating a multiple management block by performing time division multiplexing processing in the same manner as the time division multiplexing processing of the first multiplexing means on the plurality of management blocks created by the creating means;
Channel detecting means for detecting a channel to which a management block noted by the second multiplexing means belongs;
Block detecting means for detecting another management block belonging to the same channel as the channel detected by the channel detecting means from the multiplexed management blocks generated by the second multiplexing means;
Calculating means for calculating a distance from a management block noticed by the second multiplexing means to a management block detected by the block detecting means; and distance information indicating the distance calculated by the calculating means as the second multiplexing means A data processing apparatus comprising: an assigning unit that assigns to at least one of the management block noted by the block and the management block detected by the block detection unit.   The calculating means integrates a numerical value related to the size of the management block for each channel in parallel with the processing of the second multiplexing means, and the channel among a plurality of integrated values obtained by the integrating means 2. The data processing apparatus according to claim 1, further comprising initialization means for initializing an integrated value corresponding to the channel detected by the detection means. The data block is formed by a plurality of data elements each having a variable size;
The data processing apparatus according to claim 2, wherein the management block is formed by a plurality of management elements respectively corresponding to the plurality of data elements and each having a predetermined size.   4. The data processing apparatus according to claim 3, wherein the accumulating unit accumulates a numerical value corresponding to the predetermined size every time a new management element forming a management block noticed by the second multiplexing unit is obtained.   5. The data according to claim 4, wherein the allocating unit includes a first numerical value allocating unit that allocates the integrated value obtained by the integrating unit for the channel detected by the channel detecting unit to the new block element as the distance information. Processing equipment. The calculating means further includes subtracting means for repeatedly subtracting a numerical value corresponding to the predetermined size from an integrated value corresponding to the channel detected by the channel detecting means,
The assigning means includes second numerical value assigning means for assigning a plurality of subtraction values obtained by the subtracting means to the plurality of management elements forming the management block detected by the block detecting means, respectively, as the distance information. The data processing device according to any one of 3 to 5. A discriminating means for discriminating whether or not the new management element is the first management element of the management block;
The data processing apparatus according to claim 6, wherein the subtracting unit executes a subtracting process when the result of the determining unit is updated from a negative result to a positive result. The data of each of the plurality of channels is data representing a moving image,
The data processing apparatus according to claim 3, wherein the data element corresponds to one frame of image data. A first recording means for recording the multiplexed data block created by the first multiplexing means on a recording medium; and a second recording means for recording the multiplexed management block created by the second multiplexing means on the recording medium. A data processing apparatus according to any one of claims 1 to 8. Block specifying means for specifying the data block of the designated channel from the multiple data blocks recorded on the recording medium based on the distance information assigned by the assigning means;
The deblocking means for deblocking the data block specified by the block specifying means, and the output means for outputting the data deblocked by the deblocking means, further comprising: The data processing apparatus described in 1.   11. The data processing apparatus according to claim 1, wherein the output means employs an MPEG system as an encoding system.   The data processing apparatus according to claim 1, wherein the data of the plurality of channels have different bit rates. Output means for repeatedly outputting a plurality of data blocks respectively belonging to a plurality of channels in parallel;
First multiplexing means for performing time division multiplexing on the plurality of data blocks output by the output means to generate a multiplexed data block;
Creating means for creating a plurality of management blocks for managing each of the plurality of data blocks output by the output means; and the same as time division multiplexing processing of the first multiplexing means for the plurality of management blocks created by the creating means In a processor of a data processing device comprising a second multiplexing means for performing a time division multiplexing process of the aspect to generate a multiplexing management block,
A channel detection step of detecting a channel to which a management block noted by the second multiplexing means belongs;
A block detection step of detecting another management block belonging to the same channel as the channel detected in the channel detection step from the multiplexed management block generated by the second multiplexing means;
A calculating step for calculating a distance from a management block noticed by the second multiplexing unit to a management block detected by the block detecting step; and distance information indicating the distance calculated by the calculating unit. A data processing program for executing an assigning step to assign to at least one of the management block noted by the block and the management block detected by the block detection means. Output means for repeatedly outputting a plurality of data blocks respectively belonging to a plurality of channels in parallel;
First multiplexing means for performing time division multiplexing on the plurality of data blocks output by the output means to generate a multiplexed data block;
Creating means for creating a plurality of management blocks for managing each of the plurality of data blocks output by the output means; and the same as time division multiplexing processing of the first multiplexing means for the plurality of management blocks created by the creating means A data processing method for a data processing apparatus comprising a second multiplexing unit that performs time division multiplexing processing of an aspect to generate a multiplexing management block,
A channel detection step of detecting a channel to which a management block noted by the second multiplexing means belongs;
A block detection step of detecting another management block belonging to the same channel as the channel detected in the channel detection step from the multiplexed management block generated by the second multiplexing means;
A calculating step for calculating a distance from a management block noticed by the second multiplexing unit to a management block detected by the block detecting step; and distance information indicating the distance calculated by the calculating unit. A data processing method comprising: an allocation step of allocating to at least one of the management block noted by the block and the management block detected by the block detection means.

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