JP4991143B2 - Video processing apparatus and computer program - Google Patents

Description

  The present invention relates to video processing, and more particularly to a specially reproducible video processing apparatus and computer program.

  In recent years, with the development of information technology, it has become possible to record digitized video data on a semiconductor memory, a DVD (Digital Versatile Disc), a hard disk drive (HDD), or the like that has been reduced in capacity and price. ing.

  In the recording medium such as the DVD, the video signal is digitally processed and encoded into a video stream including one or more frames by moving picture compression encoding such as MPEG (Moving Pictures Experts Group). , The video stream is recorded.

  A picture stream (hereinafter, referred to as GOP) composed of one or more frames is present in a video stream that has been subjected to the MPEG moving image compression encoding.

  In addition, the picture type includes an I picture, a P picture, or a B picture. An I picture is an intra-frame encoded image and can be decoded alone. The P picture is a forward prediction encoded image, and a past picture is required for decoding. A B picture is a bidirectional predictive encoded image, and past and future pictures are required for decoding.

  In such a moving image compression code such as the MPEG system, the order of pictures to be encoded and the order of pictures to be decoded and output are different from those of I pictures, P pictures, or B pictures. When performing special reproduction such as reproduction, it is necessary to select a picture to be reproduced as appropriate from the above pictures.

  As shown in FIG. 6 (a), for example, in reproduction at about 1 to 2 times speed such as standard speed reproduction (normal reproduction), all of the I picture, B picture, and P picture are to be decoded. In high-speed playback of about double speed, the I picture and P picture are to be decoded, and in high speed playback exceeding the triple speed shown in FIG. 6B, only the I picture is to be decoded. FIG. 6 is an explanatory diagram showing a schematic configuration of a video stream to be reproduced according to the related art.

  Also, in the moving picture compression coding such as the MPEG system, the code amount for each picture such as I picture or B picture is greatly different, so that the reading side for reading the video stream from the recording medium in the video processing apparatus and the video stream are decoded. In general, a buffer is provided between the decoder side.

  Since the speed of the decoding process on the decoding side and the speed of the reading process on the reading side are different in the short term, a buffer is provided, but the time of the video stream output by the reading side and the time of the video stream decoded by the decoder side is provided. The position is greatly different.

  For this reason, for example, as shown in FIG. 7, when the playback mode is changed (or shifted) from special playback such as high-speed playback that selects only an I picture to normal speed playback (normal playback), that is, on the decoder side. When the normal playback mode is changed after decoding the I picture (“I2”) in the second GOP, on the reading side, the I pictures (“I1” to “I”) already existing in the first to fourth GOPs. I4 ") has already been output in the buffer.

  Since the playback mode has been changed, the reading side includes the fifth GOP (“I5”) as the video stream for normal playback following the last I picture (“I4”) output as the video stream for high speed playback. Picture group) is output, but one decoder side does not decode the video stream for high speed playback ("I3", "I4") after the timing when the playback mode is changed, and the video stream for normal playback ( In order to decode (a group of pictures including “I5”), a picture that is temporally separated from the final image during high-speed playback is displayed on the screen. In particular, in the case of high-speed playback in which only an I picture is selected, a picture that is far away from the final image is displayed on the screen, which is a serious problem.

  In the prior art, as shown in FIG. 8, when decoding a picture at high speed playback, the header information (DTS, etc.) related to the last picture before changing the playback mode is used to solve this problem. (For example, see Patent Document 1). FIG. 8 is an explanatory diagram schematically showing an example of a data structure in MPEG.

JP-A-10-271458

  However, since it is necessary to provide decoding means on the reading side as well as the decoder side to decode the picture and acquire header information such as DTS (decoding time stamp), the processing on the reading side becomes complicated and the load is increased. There was a problem that became very large.

  In addition, when the reading side is composed of a chip different from the decoder side, since the reading side is provided with decoding means, the circuit configuration is complicated, the chip size is increased, and the development cost and manufacturing are increased. There was a problem that the cost would increase.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved video processing apparatus capable of suppressing special processing load on the reading side and easily executing special reproduction. And providing a computer program.

In order to solve the above problems, according to a first aspect of the present invention, a video processing device reads a video stream composed of at least one or more pictures from a recording medium and outputs the video stream to a buffer. and a reading unit that,
A reproduction control number assigning unit for assigning a reproduction control number corresponding to a media address indicating a recording position at which the picture is recorded on the recording medium ;
A first storage unit for storing a first number table including the media address and a playback control number corresponding to the media address ;
A decoder that extracts a video stream from the buffer and decodes one or more pictures configured in the video stream according to a predetermined method ;
A change notification unit for transmitting a reproduction mode change signal notifying the read unit and / or the decoder unit of the change of the reproduction mode upon receiving a change of the reproduction mode from the user ;
A second storage unit that stores a second number table including an address of a picture decoded by the decoder unit and a reproduction control number assigned to the picture by the reproduction control number assigning unit ;
The decoder unit obtains the reproduction control number corresponding to a picture decoded at a timing close to the reception timing of the reproduction mode change signal from the second number table , deletes the video stream on the buffer, Transferring the reproduction control number acquired from the second number table to the reading unit ;
The reading unit acquires a media address corresponding to the playback control number from the first number table based on the playback control number received from the decoder unit, and reads a picture from the recording medium according to the media address The video stream is output to the buffer sequentially from the picture.

  The picture decoded by the decoder unit recorded in the second number table may be, for example, meta information or a mark indicating that the picture has been decoded, The two storage units may be integrated or separate.

  The second number table is assigned in the order in which the pictures are decoded, and includes a buffer address indicating a storage location on the buffer and a reproduction control number corresponding to the picture; the decoder unit includes the buffer address Based on the above, the playback control number of the picture decoded at a timing close to the timing of receiving the playback mode change signal is acquired from the second number table, and the video stream on the buffer is deleted and the acquisition is performed. The reproduced control number may be transferred to the reading unit.

  When the reproduction control numbers are given in ascending order, the decoder unit may acquire the reproduction control number that is the largest number from the second number table and transfer it to the reading unit.

  When the reproduction control numbers are assigned in descending order, the decoder unit may acquire the reproduction control number that is the smallest number from the second number table and transfer it to the reading unit.

In order to solve the above problem, according to another aspect of the present invention, a video processing apparatus reads a video stream including a group of pictures in which pictures of one or more frames are grouped from a recording medium. , A reading unit for outputting the video stream to a buffer ;
A reproduction control number assigning unit for assigning a reproduction control number corresponding to a media address indicating a recording position at which the picture group is recorded on the recording medium for each picture group ;
A first storage unit for storing a first number table including the media address and a playback control number corresponding to the media address ;
A decoder that extracts a video stream from the buffer and decodes one or more pictures configured in a picture group of the video stream ;
A change notification unit for transmitting a reproduction mode change signal notifying the read unit and / or the decoder unit of the change of the reproduction mode upon receiving a change of the reproduction mode from the user ;
A second storage unit for storing a second number table including an address of the picture group decoded by the decoder unit and a reproduction control number assigned to the picture group by the reproduction control number assigning unit; ,
The decoder unit obtains the playback control number corresponding to a group of pictures including pictures decoded at a timing close to receiving the playback mode change signal from the second number table, and obtains a video stream on the buffer. And deleting the reproduction control number acquired from the second number table to the reading unit ,
The reading unit obtains a media address corresponding to the playback control number from the first number table based on the playback control number received from the decoder unit, and selects a picture group from the recording medium according to the media address. When read, the video stream is output to the buffer in order from the picture group.

  Note that the picture group decoded by the decoder unit recorded in the second number table is, for example, meta information indicating that at least one of the pictures constituting the picture group or the picture group has been decoded. Alternatively, a mark or the like may be used, and the first storage unit and the second storage unit may be integrated or separate.

  The second number table is assigned in the order in which pictures constituting the picture group are decoded, and includes a buffer address indicating a storage location on the buffer and a reproduction control number corresponding to the picture; the decoder unit Obtains, from the second number table, the reproduction control number of the picture decoded at the timing close to the reception timing of the reproduction mode change signal based on the buffer address, and deletes the video stream on the buffer In addition, the acquired reproduction control number may be transferred to the reading unit.

  The picture corresponding to the buffer address may be an intra-frame coded picture at the head of one or more pictures configured in the picture group.

  The reproduction control number assigning unit has a one-to-one correspondence with a media address indicating a recording position at which the first intra-frame encoded picture of one or more pictures constituting the picture group is recorded on the recording medium. A reproduction control number is assigned; the second number table is composed of a buffer address related to the first intra-frame coded picture in the picture group and a reproduction control number corresponding to the intra-frame coded picture; The decoder unit obtains, from the second number table, a reproduction control number of an intra-frame coded picture decoded at a timing close to the timing of receiving the reproduction mode change signal based on the buffer address. Deletes the video stream on the buffer and transfers the acquired playback control number to the reading unit It may be so that.

In order to solve the above-described problem, according to another aspect of the present invention, a computer program that causes a computer to function as a video processing apparatus is a video stream composed of at least one or more pictures. read from the recording medium, and a first read step of outputting the video stream in the buffer, the picture confer regeneration control number corresponding to the one-to-one with the media address indicating the recorded recording position on the recording medium reproduction control A number assigning step, a first storage step for storing the assigned playback control number and a media address corresponding to the playback control number in a first number table comprising a playback control number and a media address ; 1 or 2 configured to extract a video stream from the buffer and configure the video stream A decoding step of decoding the picture above in accordance with a predetermined method, when receiving a change in the reproduction mode from the user, and change notification transmitting the reproduction mode change signal indicating a change in the reproduction mode, decoded by said decoding step The stored picture address, the reproduction control number assigned to the picture by the reproduction control number assigning unit in the second number table, and the timing of receiving the reproduction mode change signal and the timing close thereto acquires the reproduction control number corresponding to the decoded picture, deletes the video stream on the buffer, and the reproduction control number transfer step of transferring the acquired reproduction control number, the playback control number that has been the transfer Based on the media corresponding to the reproduction control number from the first number table It obtains the address, according to the media address from the recording medium, reads the picture, is characterized by having a second read step of outputting from the picture the video stream to the buffer in the order.

In order to solve the above problems, according to another aspect of the present invention, a computer program that causes a computer to function as a video processing device is a computer program that causes a computer to function as a video processing device. Te, 1 or 2 or more frames of pictures read from the recording medium composed video stream from a grouped picture group, and a first read step of outputting the video stream in the buffer, the picture for each of the group of pictures Media group corresponding to the a reproduction control numbering step of imparting playback control number corresponding to the one-to-one with the media address indicating the recorded recording position on the recording medium, the applied reproduction control number and the regeneration control number Address is a first number text consisting of a playback control number and a media address. A first storing step of storing the Buru retrieves a video stream from the buffer, and a decoding step of decoding the one or more pictures that are configured picture group of the video stream, adjusting a playback mode from the user A change notification step of transmitting a playback mode change signal notifying the change of the playback mode ;
Storing the address of the picture group decoded in the decoding step and the reproduction control number assigned to the picture group by the reproduction control number assigning unit in a second number table; and the reproduction mode change signal A reproduction control number transfer step of acquiring the reproduction control number corresponding to a picture group including pictures decoded at a timing close to reception and deleting the video stream on the buffer and transferring the acquired reproduction control number If, obtains the media address corresponding to the regeneration control number from the first number table based on the reproduction control number that has been the transfer, according to the media address from the recording medium, reads the group of pictures, the Second readout for outputting a video stream to the buffer in order from a group of pictures It is characterized by a step.

  In order to solve the above problem, according to another aspect of the present invention, a video processing method reads a video stream composed of at least one or more pictures from a recording medium and buffers the video stream. A first read step for outputting to the reproduction control number assigning step for assigning a reproduction control number corresponding to the media address indicating the recording position where the picture is recorded on the recording medium, and the assigned reproduction. A first storage step of storing a control number and a media address corresponding to the playback control number in a first number table comprising the playback control number and the media address; taking out the video stream from the buffer, A decoding step of decoding one or more pictures configured in the stream according to a predetermined scheme; A change notification step for transmitting a reproduction mode change signal informing the change of the reproduction mode upon receiving a change of the reproduction mode from a user; corresponding to a picture decoded at a timing near the timing of receiving the reproduction mode change signal A reproduction control number transfer step of acquiring the reproduction control number, deleting the video stream on the buffer, and transferring the acquired reproduction control number; and the first based on the transferred reproduction control number A second read step of obtaining a media address corresponding to the playback control number from the number table and reading a picture from the recording medium according to the media address, and sequentially outputting a video stream to the buffer from the picture. It is characterized by including.

  In order to solve the above problems, according to another aspect of the present invention, a video processing method reads a video stream composed of a group of pictures in which pictures of one or more frames are grouped from a recording medium. A first reading step for outputting the video stream to a buffer; and for each picture group, a reproduction control number corresponding to a media address indicating a recording position at which the picture group is recorded on the recording medium is assigned to the picture group. A reproduction control number assigning step; a first storage step for storing the assigned reproduction control number and a media address corresponding to the reproduction control number in a first number table composed of the reproduction control number and the media address; Taking out the video stream from the buffer, and one or more pixels configured in the picture group of the video stream; A decoding step for decoding the playback mode; a change notification step for transmitting a playback mode change signal informing the change of the playback mode upon receiving a change of the playback mode from the user; and a timing for receiving the playback mode change signal A reproduction control number transfer step of acquiring the reproduction control number corresponding to a picture group including pictures decoded at timing, deleting the video stream on the buffer, and transferring the acquired reproduction control number; When a media address corresponding to the playback control number is obtained from the first number table based on the playback control number, and a group of pictures is read from the recording medium according to the media address, images are sequentially displayed from the picture group. And a second reading step for outputting the stream to the buffer. It is characterized by a door.

  In order to solve the above-described problem, according to another aspect of the present invention, a video processing apparatus reads a video stream composed of at least one or more pictures from a recording medium and buffers the video stream. A reproduction control number assigning unit for assigning a reproduction control number corresponding to the media address indicating the position where the picture is recorded on the recording medium; and the media address and the media address A first storage unit for recording a corresponding reproduction control number and storing a first number table; taking out a video stream from the buffer and selecting one or more pictures configured in the video stream in a predetermined format A decoder unit for decoding according to the above; header information relating to a picture decoded by the decoder unit and the reproduction control A second storage unit that records the reproduction control number assigned to the picture by the number assigning unit and stores a second number table; and upon receiving a change of the reproduction mode from the user, the reading unit and And / or a change notification unit that transmits a reproduction mode change signal for notifying the decoder unit of the change of the reproduction mode. The decoder unit is abbreviated to receive the reproduction mode change signal from the change notification unit. Acquires one of the playback control numbers before and after the playback control number corresponding to the picture decoded at the same timing, deletes the video stream on the buffer, and reads out the acquired playback control number. The reading unit reads the reproduction control number from the first number table based on the reproduction control number received from the decoder unit. It acquires corresponding media address, according to the media address from the recording medium, reads the picture, and a video stream in order from the picture characterized by outputting to the buffer.

  As described above, according to the present invention, the reproduction control number is recorded in the table, thereby realizing a natural video connection for the user when switching the special reproduction without complicating the circuit configuration. Is possible.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, components having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted.

(About video playback device)
First, a video playback device (video processing device) 101 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing an example of a schematic configuration of the video reproduction apparatus according to the present embodiment.

  The video playback device 101 is a device having a playback function for decoding video data recorded on the recording medium 131 and outputting it to an output device (output device) such as a display device. Note that the video playback device 101 according to the present embodiment is not limited to the playback function. For example, the video playback device 101 encodes the playback function and an input video signal into video data and stores the video data in the recording medium 131. A device having a recording function for recording may be used.

  Further, the video reproduction apparatus 101 according to the present embodiment may be provided with, for example, an imaging unit such as a CCD, and a video signal transmitted by the imaging unit is input and recorded on the recording medium 131.

  In the case where the video playback device 101 includes the above-described imaging means, the video playback device 101 records the video data obtained by capturing the subject or the like on the recording medium by the video playback device 101 itself, or is recorded on the recording medium. It can be said that it is a so-called recordable / reproducible integrated video processing apparatus that reproduces video data by the video playback apparatus 101 itself.

  As shown in FIG. 1, a video playback apparatus 101 according to this embodiment includes an instruction receiving unit 111 that receives instructions from a user such as a playback mode change and playback start, a controller 113, and a media interface (reading side or A reading unit) 114 and a media decoder (decoder side or decoder unit) 116.

  The instruction receiving unit 111 can receive, for example, an instruction to start playback, an instruction to end playback, an instruction to change the playback mode (from normal playback to high-speed playback, normal playback to high-speed rewind playback, etc.) from the user. Alternatively, the button includes two or more buttons (such as a playback start button, a playback end button, or a playback mode change button), but is not limited to such an example, and the instruction receiving unit 111 can receive various instructions from the user. If possible, it may be a pointing device or keyboard such as a trackball, trackpad, stylus pen, dial log, or joystick.

  Note that high-speed playback or high-speed rewind playback according to the present embodiment is one type of special playback, for example, 2 × speed, 3 × speed,. However, the present invention is not limited to such an example. Details will be described later.

  In addition, when receiving an instruction from the user, the instruction receiving unit 111 transmits an instruction signal such as a reproduction mode change signal indicating the instruction content to the controller 113. Based on the instruction signal, the controller 113 controls each part on the reading side 114 or the decoder side 116 to execute a reproduction mode change process or the like.

  The controller 113 controls processing of the instruction receiving unit 111, the reading side 114, and the decoder side 116 of the video reproduction device 101. For example, the controller 113 instructs the reading side 114 and the decoder side 116 to change the playback mode from high-speed playback to normal playback (playback mode change signal).

  The reading side 114 includes a reading side storage unit (first storage unit) 120 that stores a reading side number table 133, a controller 121, a GOP number assigning unit 122, a recording medium reading unit 123, and a header detection unit 124. And.

  The controller 121 controls the operation of each unit provided on the reading side 114 in accordance with an instruction from the controller 113.

  Further, the controller 121 records the GOP number (reproduction control number) assigned by the GOP number assigning unit 122 and the media address corresponding to the GOP number in the reading-side number table (first number table) 133.

  When receiving the GOP number from the controller 126, the controller 121 instructs the recording medium reading unit 123 to start reading from the GOP corresponding to the GOP number. The GOP number / reading side number table 133 will be described later.

  When the header header 124 detects the sequence header, the GOP number assigning unit 122 assigns a GOP number to the sequence for the leading I picture in each GOP.

  Further, for example, when the GOP number is assigned to each GOP, the GOP number assigning unit 122 transfers the assigned GOP number and the media address of the leading I picture to the controller 121 as a set. Note that the GOP number assigning unit 122 is not limited to this example, and can be implemented, for example, when the GOP number is transferred when the playback mode is switched and the GOP number is incremented on the media interface side and the decoder side, respectively. .

  The media address is an address indicating the recording location where data such as each picture or GOP is recorded on the recording medium 131, and the GOP number assigning unit 122 receives the media address from the header detecting unit 124. .

  The header detection unit 124 includes information indicating that (1) the sequence header, (2) the GOP header, (3) the picture header and the picture is an I picture among the data configured in the GOP read from the recording medium 131. The GOP is detected by detecting any one of (the picture type is “I”).

  For example, when the header detection unit 124 detects a sequence header, the header detection unit 124 notifies the GOP number giving unit 122 of the detection and outputs the video stream to the buffer 127 on the decoder side 116. However, the present invention is not limited to this example. For example, when the header detection unit 124 detects a sequence header, the header detection unit 124 notifies the GOP number giving unit 122 of the detection, and when receiving the GOP number from the GOP number giving unit 122, the GOP number is, for example, header information of an I picture. However, the present invention can be implemented even when the data is stored in the spare area or the like and output to the buffer 127 on the decoder side 116.

  In the reading side 114 according to the present embodiment, the case where the header detection unit 124 detects the sequence header has been described as an example, but the recording location of the first I picture in the GOP (media) For example, if the address is managed in advance in an attached file, the reading side 114 can detect the first I picture without the header detection unit 124, for example. Can do.

  The decoder side 116 includes a decoder side storage unit (second storage unit) 135 that stores a decoder side number table (second number table) 135, a controller 126, a buffer 127, and a decoding unit 128. Yes.

  The controller 126 controls the operation of each unit provided on the decoder side 116 in accordance with an instruction from the controller 113.

  Further, the controller 126 records the GOP number received from the decoding unit 128 and the buffer address indicating the location written on the buffer 127 related to the leading I picture in the decoder-side number table 135. The decoder side number table 135 will be described later.

  Further, the controller 126 compares the buffer address of the I picture decoded at the timing when the playback mode change signal is received from the controller 113 with the buffer address stored in the decoder side number table 135, and determines an appropriate GOP number. Acquired from the decoder side number table 135 and transmits the acquired GOP number to the controller 121 on the reading side 114.

  As shown in FIG. 1, the case where the reading-side storage unit 120 and the decoder-side storage unit 125 according to the present embodiment are separated from each other has been described as an example. However, the present invention is not limited to this example. The reading-side storage unit 120 and the decoder-side storage unit 125 can be implemented even when they are integrally configured as one storage unit.

  On the recording medium 131, a video stream in which a sequence of image signals is rearranged (reordering) and encoded into a GOP (Group Of Picture or a group of pictures) composed of pictures of one or more frames is provided. It is recorded. Therefore, the video stream includes one or more GOPs. The video stream is assumed to be composed of at least one of moving image, audio, or meta information including EPG, low resolution video, and the like.

  The recording medium 131 according to the present embodiment exemplifies an optical disk such as a CD-ROM or a DVD, or a magnetic disk such as a hard disk drive, for example, as long as it can store a video stream encoded by the MPEG method or the like. However, it is not limited to such an example.

  The buffer 127 is storage means having a storage area of a predetermined size. The buffer 127 stores the read video stream and can delete (flash) the video stream.

  The buffer 127 according to the present embodiment can be exemplified by a memory such as SDRAM or DRAM, but is not limited to such an example.

  The decoding unit 128 reads the video stream stored in the buffer 127 from the storage area of the buffer 127, and decodes one or more frames configured in the GOP.

  The decoding unit 128 acquires the GOP number included in the sequence header of the video stream extracted from the buffer 127 and the buffer address related to the first I picture in the GOP, and transfers them to the controller 126.

  From the above, the decoding unit 128 is a decoder that acquires the encoded video data read from the recording medium 131 by the reading side 114 from the buffer 127 and decodes it into a video signal.

  Although not shown in FIG. 1, the video reproduction device 101 may further include a display device (not shown) that can output the video signal output from the decoding unit 128. For example, the display device can display the video signal output from the decoding unit 128 on the screen. The display device can be exemplified by a liquid crystal display, for example, and can output a still image, a moving image, audio, or any combination thereof.

  Next, the GOP will be described. The GOP is a collection of pictures (image data) of one or more frames encoded according to the MPEG system or the like. Note that a GOP is generally composed of, for example, 10 frames to 15 frames of picture in one GOP. However, the GOP is not limited to such an example, and is called a so-called Long GOP. For example, a GOP includes pictures of 60 frames or more. It may be the case.

  The picture includes an I picture (Intra picture or intra-frame encoded image), a P picture (Predictive picture or inter-frame forward prediction encoded image), and a B picture (Bidirectionally predictive encoded image). Or bi-predictive encoded image) and three types of pictures. In addition, the picture concerning this Embodiment means the image or data of each flame | frame comprised by the image data after encoding, However, It is not limited to this example.

  The I picture is an independent picture that does not use the correlation with the previous frame, the P picture is a picture that uses the correlation with the previous frame, and the B picture includes both the previous and next frames. It is a picture that uses the correlation of.

  In general, the image quality at the same bit rate is better when the B picture is sandwiched between the I picture or the P picture than when only the I picture and the P picture are used without using the B picture.

(About GOP number)
Next, the GOP number according to the present embodiment will be described with reference to FIG. FIG. 2 is an explanatory diagram showing an example of a schematic configuration of the GOP number according to the present embodiment.

  As shown in FIG. 2A, the video stream includes GOP 203-1, GOP 203-2, GOP 203-3, GOP 203-4,. Note that one GOP 203 may be included in the video stream.

  The header detection unit 124 detects any one of (1) sequence header, (2) GOP header, and (3) information indicating that the picture is an I picture (picture type is “I”) of each GOP 203. To do.

  When the header detection unit 124 detects a sequence header, for example, as shown in FIG. 2B, the GOP number assigning unit 122 detects each I picture 205 (205-1, 205-2,... ) Corresponding to each GOP number 201 (201-1, 201-2,...) In order so as not to overlap.

  Further, the GOP number assigning unit 122 transmits the media address of the detected I picture 205 and the GOP number 201 corresponding to the I picture to the controller 121, thereby creating the read number table 133.

  As shown in FIG. 2, the GOP numbers according to the present embodiment have been described by taking, as an example, the numbers consecutive in ascending order of 0, 1, 2,..., But each GOP is specified in time series. If possible, the present invention is not limited to this example. For example, the GOP number may be an alphabet such as A, B, or C, or may be a symbol. For example, the GOP number is 100, 99, 98. ,... May be given in descending order, or may be in ascending order such as 0, 1, 5, 10,.

  Further, the GOP number according to the present embodiment has been described by taking as an example the case where the GOP number is assigned to each I picture 205 existing at the beginning of each GOP 203 as shown in FIG. For example, the GOP number may be assigned to all of one or more pictures configured in each GOP 203, and may be GOP for each I picture and / or P picture configured in each GOP 203. For example, a number may be given.

(About the table)
Next, a table according to the present embodiment will be described with reference to FIG. FIG. 3 is an explanatory diagram showing a schematic configuration of a read-side number table and a decoder-side number table according to the present embodiment.

  As shown in FIG. 3A, the read-side number table 133 is a table composed at least of the GOP number and the media address of the leading I picture 205 included in the GOP 203.

  In the reading-side number table 133, the GOP number and the media address of the I picture 205 correspond one-to-one. For example, when the GOP number is “0”, the media address of the I picture is “00006A08”.

  The controller 121 reads the video stream from the recording medium 131 and records it in the reading-side number table 133 in the order in which the GOP numbers are given. Therefore, by referring to the reading-side number table 133, it is possible to grasp from where the video stream starts to be read and how far the video stream has been read at the present time.

  As shown in FIG. 3A, the reading-side number table 133 has been described as an example in which a media address is included, but the target data (GOP or picture) stored in the recording medium 131 is described. As long as the information can be specified and read, the present invention is not limited to this example, and other header information or meta information may be used instead of the media address.

  As shown in FIG. 3B, the decoder-side number table 135 is a table composed at least of a GOP number and a buffer address indicating a storage location of the I picture 205 on the buffer.

  In the decoder side number table 135, the GOP number and the buffer address of the I picture 205 have a one-to-one correspondence. For example, when the GOP number is “0”, the buffer address of the I picture is “0103”.

  For example, the controller 126 reads a video stream from the buffer 127, receives buffer addresses (or write addresses) managed by the buffer 127 in the order in which pictures are decoded, and records the buffer addresses in the decoder-side number table 135. To do. Therefore, by referring to the decoder side number table 135, it is possible to grasp where the video stream starts to be decoded and how far the video stream has been decoded at the present time.

  More specifically, since buffer addresses from GOP numbers 0 to 7 are recorded in the decoder side number table 135 shown in FIG. 3, when GOP numbers are assigned in ascending order, decoding to GOP number 7 is possible. Indicates that it has finished.

  As shown in FIG. 3 (b), the decoder side number table 135 has been described by way of an example in which a buffer address is included, but it may indicate from where in the GOP number to where decoding has been completed. If possible, the present invention is not limited to this example, and it may be header information other than the buffer address or meta information of a picture, or decoded video data.

(Operation of playback mode change processing)
Next, with reference to FIGS. 4 and 5, the playback mode changing process by the video processing apparatus 101 according to the present embodiment will be described. FIG. 4 is a sequence diagram showing an outline of the reproduction mode changing process according to the present embodiment, and FIG. 5 is an explanatory diagram showing an outline of the reproducing mode changing process according to the present embodiment.

  First, as shown in FIG. 4, when standard speed playback (normal playback) is started by the video processing device 101, the media interface (reading side) 114 in the video processing device 101 starts the recording medium reading unit 123 from the recording medium 131. The video stream is read and the video stream is output to the buffer 127 (S401).

  Next, the video stream output to the buffer 127 is read by the decoding unit 128, one or more pictures configured in each GOP are decoded, output as a video signal, and displayed on the screen. (S403).

  Next, when an instruction to change the playback mode from normal playback to high-speed playback such as triple speed is received from the user via the instruction receiving unit 111, the instruction receiving unit 111 transmits a playback mode change signal to the controller 113. To do.

  Similarly, the controller 113 transmits a playback mode change signal to the controller 121 and the controller 126 to change the playback mode from normal playback to high speed playback.

  When receiving the playback mode change signal from the controller 113, the controller 121 instructs the recording medium reading unit 123 and the header detection unit 124 to read out a video stream for high-speed playback from the received timing.

  When the header detection unit 124 detects a sequence header associated with each GOP, the header detection unit 124 notifies the GOP number giving unit 122 of it.

  When a notification is received from the header detection unit 124, the GOP number assigning unit 122 assigns a GOP number corresponding to the leading I picture in the GOP on a one-to-one basis (S405), and the GOP number is assigned to the controller 121 and the decoder side. The data is transmitted to the controller 126 (S407). Note that the media address of the I picture is further transmitted to the controller 121 by the GOP number assigning unit 122.

  When detecting the sequence header associated with each GOP, the header detection unit 124 notifies the GOP number giving unit 122 and outputs only the I picture in each GOP of the video stream to the buffer 127 for high-speed playback (S409). .

  Further, the decoder side 116 erases (flashes) the data on the buffer 127 when the playback mode becomes high-speed playback, and then the buffer 127 displays the I-picture for high-speed playback output from the reading side 114. Store in order.

  Next, on the decoder side 116, the I picture is decoded by the decoding unit 128 and a video signal is output, and the buffer address of the I picture is transferred to the controller 126 (S411). The buffer address is managed by the buffer 127. For example, the buffer 127 allocates buffer addresses of I pictures in the order of decoding by the decoding unit 128, but is not limited to this example.

  First, the controller 126 sequentially records the received GOP numbers in the decoder-side number table 135 in the order of transmission from the GOP number assigning unit 122. Further, the controller 126 sequentially records the received buffer addresses in the decoder side number table 135 in the order transmitted from the decoding unit 128.

  High-speed playback composed of the processing in steps S405 to S411 is repeatedly executed until the next playback mode change.

  Next, when an instruction to change the playback mode from high speed playback to normal playback is received from the user via the instruction receiving unit 111, the instruction receiving unit 111 sends a playback mode change signal for changing to normal playback to the controller. 113.

  Similarly, the controller 113 transmits a playback mode change signal to the controller 121 and the controller 126 to change the playback mode from high speed playback to normal playback.

  Next, the controller 126 refers to the decoder-side number table 135 at the timing of receiving the reproduction mode change signal, acquires the GOP number decoded last, and the GOP number corresponding to the next GOP number. Is transferred to the controller 121 (S413).

  The last decoded GOP number is, for example, the latest (latest) GOP number among the buffer addresses recorded in the decoder side number table 135, but is not limited to this example.

  Further, the controller 126 according to the present embodiment is not limited to the case of transferring the GOP number next to the last decoded GOP number. For example, the controller 126 is one previous to the last decoded GOP number. The last GOP number may be transferred, the last decoded GOP number may be transferred, or the last GOP number decoded may be transferred.

  When the controller 121 receives the GOP number transferred from the controller 126, the controller 121 acquires the media address corresponding to the GOP number from the reading-side number table 133 and transfers it to the recording medium reading unit 123.

  Based on the media address from the controller 121, the recording medium reading unit 123 reads the corresponding GOP from the first I picture in order from the recording medium 131 (S415) and outputs it to the buffer 127 (S417).

  The buffer 127 stores data for normal reproduction, and after flashing the data on the buffer 127 once, stores the video stream (one picture or more including I picture) from the recording medium reading unit 123. .

  The decoding unit 128 reads the video stream stored in the buffer 127, decodes a picture of one or more frames configured in the GOP into a video signal, and outputs the video signal, thereby changing the playback mode to normal playback. (S419).

  Thereafter, when the playback mode is changed again from normal playback to high-speed playback, the above-described normal playback (S401 to S403) and high-speed playback (S405 to S411) are executed, and similarly from the above-mentioned high-speed playback to normal playback. When the playback mode is changed again, high-speed playback (S405 to S411) and normal playback (S415 to S419) are executed.

  Next, as shown in FIG. 5, first, only I1, I2, I3, I4 and I picture are output from the media interface (reading side) 114 during high-speed playback. It should be noted that numbers such as I1, I2, I3, and I4 shown in FIG. 5 are attached for convenience of explanation according to time series.

  The media decoder (decoder side) 116 sequentially decodes I1, I2, I3, I4,... And I picture stored in the buffer 127, but changes the playback mode to normal playback when the I picture of I2 is decoded. The user gives an instruction to do so.

  When the reproduction mode change signal is transmitted to the controller 121 and the controller 126, the I picture of I3 and I4 has already been output to the buffer 127 from the reading side 114.

  On the other hand, when the decoder side 116 receives the reproduction mode change signal, the decoder side 116 obtains the GOP number of the data obtained by decoding the last I picture from the decoder side number table 135 and flushes the remaining data on the buffer 127. The GOP number corresponding to the last decoded I picture is the largest number among the GOP numbers in which the buffer addresses are recorded when the GOP numbers are assigned in ascending order. Note that the GOP number acquired from the decoder-side number table 135 may be, for example, the GOP number corresponding to the I picture decoded the second from the last. In this case, the GOP numbers are in ascending order. The GOP number is the next highest number after the highest number.

  Next, the GOP number acquired from the decoder side number table 135 is transmitted to the reading side 114. When the reading side 114 acquires the media address from the reading side number table 133 based on the GOP number, the reading side 114 , I2 is resumed from the output of the normal playback video stream from the GOP including I2.

  As a result of restarting the output of the video stream from the reading side 114, the video output on the screen by the decoder side 116 can be naturally connected in time series, and the playback mode is changed so that the user does not feel uncomfortable. The video processing apparatus 101 can execute the processing.

  In the playback mode change processing shown in FIGS. 4 and 5, the case where the playback mode is changed from high speed playback to normal playback has been described as an example. However, the present invention is not limited to this example. This can be implemented even when the playback mode is changed to normal playback.

  In the playback mode change processing shown in FIGS. 4 and 5, the case of high-speed playback in which only the I picture is selected and output on the screen has been described as an example. However, the present invention is not limited to this example. Even in the case of high-speed playback or the like in which a picture and / or a P-picture is selected and output on the screen, it can be implemented.

This is the end of the description of the series of operations of the playback mode changing process performed by the video processing apparatus 101 according to the present embodiment. The video processing apparatus 101 has the following effects.
(1) The playback mode can be changed with a simple device configuration without performing complicated decoding or analysis of the video stream on the reading side 114.
(2) Since the reading-side number table 133 or the decoder-side number table 135 only requires a small capacity, the storage capacity can be used efficiently. The GOP number is determined by the number of GOPs that can be held in the buffer 127, and the number of GOPs is generally about 5 to 8 bits.

  The series of processes described above can be performed by dedicated hardware or software. When a series of processing is performed by software, a program constituting the software is installed in an information processing apparatus such as a general-purpose computer or a microcomputer, and causes the information processing apparatus to function as the video processing apparatus 101.

  The program can be recorded in advance on a hard disk or ROM as a recording medium built in the computer.

  Alternatively, the program is not limited to a hard disk drive, but a removable recording medium such as a flexible disk, CD-ROM (Compact Disc Read Only Memory), MO (Magneto Optical) disk, DVD (Digital Versatile Disc), magnetic disk, and semiconductor memory. In addition, it can be stored (recorded) temporarily or permanently. Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, and is transferred from the download site to the computer wirelessly via a digital satellite broadcasting artificial satellite, or a LAN (Local Area Network) or the Internet. Such a program can be transferred to a computer via a network, and the computer can receive the program transferred in this manner and install it on a built-in hard disk.

  Here, in this specification, the processing steps for describing a program for causing a computer to perform various processes do not necessarily have to be processed in time series in the order described in the flowchart, but in parallel or individually. This includes processing to be executed (for example, parallel processing or processing by an object).

  The program may be processed by one computer, or may be distributedly processed by a plurality of computers.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for a person skilled in the art that various changes or modifications can be envisaged within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  In the above embodiment, the controller 121, the GOP number assigning unit 122, the recording medium reading unit 123, the header detecting unit 124, the controller 126, and the decoding unit 128 have been described as an example, which includes hardware such as a semiconductor chip. However, the present invention is not limited to such an example. For example, at least one of the controller 121, the GOP number assigning unit 122, the recording medium reading unit 123, the header detecting unit 124, the controller 126, or the decrypting unit 128 is a program composed of one or more modules or components. It may be the case.

It is a block diagram which shows an example of a schematic structure of the video reproduction apparatus concerning this Embodiment. It is explanatory drawing which shows an example of the schematic structure of the GOP number concerning this Embodiment. It is explanatory drawing which shows schematic structure of the reading side number table concerning this Embodiment, and a decoder side number table. It is a sequence diagram which shows the outline of the reproduction | regeneration mode change process concerning this Embodiment. It is explanatory drawing which shows the outline of the reproduction | regeneration mode change process concerning this Embodiment. It is explanatory drawing which shows schematic structure of the video stream of the reproduction | regeneration object concerning a prior art. It is explanatory drawing which shows the outline of the reproduction | regeneration mode change process concerning a prior art. It is explanatory drawing which showed schematically an example of the data structure in MPEG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Video processing apparatus 111 Instruction reception part 113 Controller 114 Media interface 116 Media decoder 121 Controller 122 GOP number assignment part 123 Recording medium reading part 124 Header detection part 126 Controller 127 Buffer 128 Decoding part 133 Reading side number table 135 Decoder side number table

Claims (12)

A video processing device ,
A reading unit that reads a video stream composed of at least one or two or more pictures from a recording medium and outputs the video stream to a buffer ;
A reproduction control number assigning unit for assigning a reproduction control number corresponding to a media address indicating a recording position at which the picture is recorded on the recording medium ;
A first storage unit for storing a first number table including the media address and a playback control number corresponding to the media address ;
A decoder that extracts a video stream from the buffer and decodes one or more pictures configured in the video stream according to a predetermined method ;
A change notification unit for transmitting a reproduction mode change signal notifying the read unit and / or the decoder unit of the change of the reproduction mode upon receiving a change of the reproduction mode from the user ;
A second storage unit that stores a second number table including an address of a picture decoded by the decoder unit and a reproduction control number assigned to the picture by the reproduction control number assigning unit ;
The decoder unit obtains the reproduction control number corresponding to a picture decoded at a timing close to the reception timing of the reproduction mode change signal from the second number table , deletes the video stream on the buffer, Transferring the reproduction control number acquired from the second number table to the reading unit ;
The reading unit acquires a media address corresponding to the playback control number from the first number table based on the playback control number received from the decoder unit, and reads a picture from the recording medium according to the media address And a video processing apparatus which outputs a video stream to the buffer sequentially from the picture. The second number table is assigned in the order in which the pictures are decoded, and includes a buffer address indicating a storage location on the buffer and a reproduction control number corresponding to the picture ,
The decoder unit obtains a playback control number of a picture decoded at a timing close to the timing of receiving the playback mode change signal based on the buffer address from the second number table, and stores the video on the buffer. The video processing apparatus according to claim 1, wherein the video processing apparatus deletes the stream and transfers the acquired reproduction control number to the reading unit. The decoder unit, when the playback control numbers are given in ascending order, obtains the playback control number which is the largest number from the second number table and transfers it to the reading unit. 3. The video processing apparatus according to 1 or 2 . The decoder unit, when the playback control numbers are assigned in descending order, acquires the playback control number that is the smallest number from the second number table and transfers the playback control number to the reading unit. 3. The video processing apparatus according to 1 or 2 . A video processing device ,
A reading unit that reads a video stream composed of a group of pictures in which pictures of one or more frames are grouped, from a recording medium, and outputs the video stream to a buffer ;
A reproduction control number assigning unit for assigning a reproduction control number corresponding to a media address indicating a recording position at which the picture group is recorded on the recording medium for each picture group ;
A first storage unit for storing a first number table including the media address and a playback control number corresponding to the media address ;
A decoder that extracts a video stream from the buffer and decodes one or more pictures configured in a picture group of the video stream ;
A change notification unit for transmitting a reproduction mode change signal notifying the read unit and / or the decoder unit of the change of the reproduction mode upon receiving a change of the reproduction mode from the user ;
A second storage unit for storing a second number table including an address of the picture group decoded by the decoder unit and a reproduction control number assigned to the picture group by the reproduction control number assigning unit; ,
The decoder unit obtains the playback control number corresponding to a group of pictures including pictures decoded at a timing close to receiving the playback mode change signal from the second number table, and obtains a video stream on the buffer. And deleting the reproduction control number acquired from the second number table to the reading unit ,
The reading unit obtains a media address corresponding to the playback control number from the first number table based on the playback control number received from the decoder unit, and selects a picture group from the recording medium according to the media address. When read, the video processing apparatus outputs a video stream to the buffer in order from the picture group. The second number table is assigned in the order in which pictures constituting the picture group are decoded, and includes a buffer address indicating a storage location on the buffer and a reproduction control number corresponding to the picture ,
The decoder unit obtains a playback control number of a picture decoded at a timing close to the timing of receiving the playback mode change signal based on the buffer address from the second number table, and stores the video on the buffer. 6. The video processing apparatus according to claim 5 , wherein the video processing apparatus deletes the stream and transfers the acquired reproduction control number to the reading unit. 7. The video processing apparatus according to claim 6 , wherein the picture corresponding to the buffer address is a first intra-frame encoded picture among one or more pictures configured in the picture group. The playback control number assigning unit has a one-to-one correspondence with a media address indicating a recording position at which a first intra-frame coded picture of one or more pictures constituting the picture group is recorded on the recording medium. Give playback control number ,
The second number table is composed of a buffer address related to the first intra-frame encoded picture in the group of pictures and a reproduction control number corresponding to the intra-frame encoded picture ,
The decoder unit obtains, from the second number table, a reproduction control number of an intra-frame coded picture decoded at a timing close to the timing at which the reproduction mode change signal is received based on the buffer address, 7. The video processing apparatus according to claim 5 , wherein the video stream on the buffer is deleted, and the acquired reproduction control number is transferred to the reading unit. 9. The decoder according to claim 5 , wherein when the playback control numbers are assigned in ascending order, the decoder unit acquires a playback control number that is the largest number and transfers the playback control number to the reading unit. The video processing apparatus described. 9. The decoder according to claim 5 , wherein when the playback control numbers are assigned in descending order, the decoder unit acquires a playback control number that is the smallest number and transfers the playback control number to the reading unit. The video processing apparatus described. A computer program for causing a computer to function as a video processing device ,
A first reading step of reading a video stream composed of at least one or more pictures from a recording medium and outputting the video stream to a buffer ;
A reproduction control number assigning step for assigning a reproduction control number corresponding to the media address indicating the recording position at which the picture is recorded on the recording medium, one-to-one ;
A first storage step of storing the assigned playback control number and a media address corresponding to the playback control number in a first number table comprising a playback control number and a media address ;
A decoding step of extracting a video stream from the buffer and decoding one or more pictures configured in the video stream according to a predetermined method ;
A change notification step of transmitting a playback mode change signal notifying the change of the playback mode upon receiving a change of the playback mode from the user ;
Storing the address of the picture decoded in the decoding step and the reproduction control number assigned to the picture by the reproduction control number assigning unit in a second number table;
A reproduction control number for acquiring the reproduction control number corresponding to a picture decoded at a timing close to the reception timing of the reproduction mode change signal, deleting the video stream on the buffer, and transferring the acquired reproduction control number A transfer step ;
When a media address corresponding to the playback control number is acquired from the first number table based on the transferred playback control number, and pictures are read from the recording medium according to the media address, the pictures are sequentially and having a second reading step of outputting the video stream to the buffer, the computer program. A computer program for causing a computer to function as a video processing device ,
A first reading step of reading a video stream composed of a group of pictures in which pictures of one or more frames are grouped, from a recording medium, and outputting the video stream to a buffer ;
A reproduction control number assigning step for assigning a reproduction control number corresponding to a media address indicating a recording position at which the picture group is recorded on the recording medium for each picture group ;
A first storage step of storing the assigned playback control number and a media address corresponding to the playback control number in a first number table comprising a playback control number and a media address ;
A decoding step of extracting a video stream from the buffer and decoding one or more pictures configured in a picture group of the video stream ;
A change notification step of transmitting a playback mode change signal notifying the change of the playback mode upon receiving a change of the playback mode from the user ;
Storing the address of the picture group decoded in the decoding step and the reproduction control number assigned to the picture group by the reproduction control number assigning unit in a second number table;
Acquires the playback control number corresponding to a group of pictures including pictures decoded at a timing close to receiving the playback mode change signal, deletes the video stream on the buffer, and transfers the acquired playback control number A playback control number transfer step ,
When a media address corresponding to the playback control number is obtained from the first number table based on the transferred playback control number, and a picture group is read from the recording medium according to the media address, the picture group and having a second reading step of outputting the video stream to the buffer in order from the computer program.

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