JP4125507B2 - Video playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a video playback device that plays back video stored in a video storage unit.
[0002]
[Prior art]
Conventionally, there is a system in which a video is stored in a video storage unit, the video is reproduced, and the reproduced video is displayed using a video projector or the like. Some of these systems use a personal computer (hereinafter referred to as a PC).
[0003]
In such a system using a PC, an application program installed in the PC is activated, and a user can enjoy a video reproduced by the activated application program. Some typical systems using such PCs can use a keyboard device as an operator.
[0004]
In such a video playback device, by storing a large number of video clips in the video storage unit in advance, when one of the keys of the keyboard device is pressed, a video clip corresponding to the keyboard is stored. Played in real time. A video clip refers to a video for a short time, for example, about 10 seconds.
[0005]
In such a video playback device, when the video clip is played back and the playback of the video clip is completed, the playback is repeated from the beginning.
[0006]
[Problems to be solved by the invention]
However, in the conventional configuration, the keys on the keyboard and the video clips are simply associated with each other, and there is a problem that the variation in reproduction is lacking.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a video reproduction apparatus capable of reproducing a variety of variations compared to the conventional one.
[0008]
[Means for Solving the Problems]
The video reproduction apparatus of the present invention that achieves the above object is
A video storage unit for storing video;
A video playback unit that reads and plays back the video stored in the video storage unit;
An operator,
A video playback start instruction is given to the video playback unit at the operation start timing of the operating element, and the operation of the operating element is terminated for the video being played back on condition that the operating element has been operated for a predetermined time or longer. And a video reproduction control unit that sets a position on the time axis at the timing as a reproduction start position when the operation element is operated next time.
[0009]
Conventionally, when the video stored in the video storage unit is read out, the video is always read from the top of the video. On the other hand, according to the video playback device of the present invention, the operation element is held for a predetermined time or more. By operating, the playback start position is arbitrarily set, and the video can be read out halfway. Therefore, it is possible to reproduce the video from a favorite place and to reproduce with a wide variety.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0011]
FIG. 1 is a hardware configuration diagram of a video generation apparatus showing an embodiment of the present invention. In this hardware configuration diagram, each part is functionally divided into block diagrams.
[0012]
This video reproduction apparatus 100 is provided with a control means 106 such as a CPU, and each part of the video reproduction apparatus 100 is controlled by this control means. The control means 106 is provided with a rewritable memory such as a hard disk, and the CPU operates according to a program stored in the memory.
[0013]
In addition, the video reproduction apparatus 100 is provided with a keyboard device 110 serving as an operator group, and the keyboard device 110 is connected to the control means 106 via an interface 109. The interface 109 receives a MIDI signal and supplies the received MIDI signal to the control means 106. The MIDI signal contains information such as program number as well as note number and velocity. Upon receiving the MIDI signal including these pieces of information, the control means 106 controls the video reading means 102 and the video effect means 103. The control means 106 also performs read / write to the control information storage means 105, and writes control information based on the MIDI signal from the keyboard device 110 and reads out the written control information. Based on the control information in the control information storage means 105, the video reading means 102 and the video effect means 103 are controlled. Further, the control means 106 displays the control information stored in the control information storage means 105 from the display means 107 and sets control parameters by the control parameter input means 108. Here, the control information storage means 105 is composed of a RAM, for example, and is preferably capable of being rewritten while a program stored in the hard disk is operating, for example. The control means 106 and the control information storage unit 105 correspond to a video reproduction control unit.
[0014]
The video reading means 102 performs read / write to the video clip storage means 101, and specifically uses a hard disk drive (hereinafter referred to as HDD). The video clip storage means 102 is a hard disk (hereinafter referred to as HD). This video clip storage means corresponds to the video storage unit.
[0015]
The control information storage means 105 also has a file allocating unit corresponding to the stored contents stored in the HD 101, and stores the start position where the video clip is stored, for example, the start address. When the reproduction start position is designated in the flow described later, this leading address is referred to. The address indicating the storage area of the HD is stored in the control information storage unit 105 as input control information.
[0016]
When a video clip is played, the address of the video clip stored in the HD is incremented or decremented. At this time, how much the address has changed is detected by, for example, operating a counter in the CPU at the same time that the video clip is reproduced from the head address. Therefore, the current address of the video clip being reproduced is constantly monitored by the control means 106.
[0017]
Therefore, the control means 106 manages the start address of the video clip corresponding to the note number corresponding to each key of the keyboard device 110, and also manages the playback position of the video clip read and played by the video reading means. Is also done. Therefore, the corresponding video clip is played by referring to the start address of the file allocation unit immediately in response to the key pressed from the keyboard device, and when the same key is pressed, the video clip You can immediately see where the is being played. That is, in the file allocation unit, in order to distinguish a large number of stored video clips, the start address of each video clip is stored, and the note number is also stored in association with the start address. In addition, after the reproduction start instruction is given by the control means 106, the control means 106 constantly monitors the reproduction position of the video signal, so that processing can be performed promptly when a new key is pressed. It is.
[0018]
The control means 106 is also provided with a timer counter for detecting how long the key is pressed when another key is pressed, and from this key press to the key release. Is also timed. Further, since the control means 106 is also provided with a comparison unit, it is also detected whether the time of pressing the keyboard device 110 after the reproduction is started is longer than or less than a predetermined time. Therefore, even when different keys are pressed, even when the same key is pressed, the control means can respond quickly.
[0019]
Further, since the control means 106 or the control information storage unit 105 is provided with a processing register, appropriate processing can be performed by appropriately rewriting this register. In other words, a variable is rewritten as necessary in accordance with the progress of the program in this register, and processing according to the program is performed by referring to the contents of this register.
[0020]
The video read out from the video clip storage unit 101 by the video reading unit 102 and reproduced is supplied to the video effect unit 103 and processed. The video effect means 103 performs cross-fade processing, dissolve processing, fade-out processing, fade-in processing, slide processing, etc., and gives an effect to the video. When a cross fade effect is applied, the transition time and the like are determined based on the velocity data in the MIDI signal from the keyboard device 110 and the parameters stored in the control information storage means 105, and the fade effect is determined. Is granted. Similarly, the processing time for fade-in and the processing time for dissolve are given based on the velocity data and the parameters stored in the control information storage means 105.
[0021]
In the control information of the control information storage means 105, control information that can also select a video clip is stored. The selection of the video clip is performed by displaying a large number of video clips from the display means 107. FIG. 2 shows a display example. A large number of video clips are displayed on the screen and can be selected by the parameter input setting means. This is performed, for example, by displaying a part of a number of video clips PIC 1... PIC 28 and keys stored in the control information storage means 105 on the screen. Of the video clips displayed here, which video clip can be assigned to which key is determined and stored in the control information storage means 105.
[0022]
If the control information assigned to the video clip is stored in the control information storage means 105 in this way, when the key is pressed and the MIDI signal is received by the control means 106, the control means 106 receives the MIDI information. The data of the note number is read from the information included in the signal, and a reproduction start instruction can be given to the video clip corresponding to the note number. At this time, the file allocation unit in the control information storage unit 105 is referred to, and the start address of the video clip to be reproduced is read by the control unit 106. This read address is supplied to the HDD 101. The HDD 101 receives the address and instantly drives the reproducing head to the address position. Then, playback of the video clip is started.
[0023]
Then, an effect is given to the video for which playback has been started by the video effect means 103. For example, when a fade-in effect parameter is assigned to the video clip, the velocity control information of the time corresponding to the velocity at the time of key pressing and the velocity of the control information storage means 105 is read out and the video clip is faded in. An effect is applied over the read time. The same applies when fading out. At this time, whether or not to provide the fade-in effect is determined by input information from the control parameter input means.
[0024]
Conventionally, video stored in the HD 101 is reproduced on a PC monitor at a resolution as low as about 320 × 240 pixels, and at the same time the video signal for the monitor is connected to a general-purpose scan converter or the like, The range of 320 × 240 pixels, which is a unit, is converted into a video signal and the video signal is output to a video video display such as a video projector. Therefore, in the present embodiment, a clearer video can be obtained by providing video signal output means. Conventionally, as a method for increasing the resolution of video, a plurality of video recording / playback apparatuses are prepared, and an input signal from the video recording apparatus is switched by a video switcher or the like and output as a video signal. If the apparatus of the present invention is used, an image with high resolution can be easily output.
[0025]
Note that an audio signal is also stored in the video clip, and although not shown, audio processing is performed, and audio synchronized with the video is output from the speaker.
[0026]
If the configuration of FIG. 1 is a commercially available PC, the configuration of the present invention can be simplified by using an expansion slot connected to the ISA bus and the PCI bus included in the PC and mounting a MIDI interface board in the expansion slot. To be realized. Further, in the video effect means and the video output means, the configuration of the present invention is realized by mounting a dedicated image processing board in the expansion slot.
[0027]
Here, a loop reproduction method which is a characteristic part of the present application will be described with reference to FIG.
[0028]
FIG. 3 is a flowchart of a loop reproduction program. This program is stored in a rewritable memory (not shown) in the control means 106.
[0029]
In step S31, any one key of the keyboard device is pressed, and the program is started simultaneously with the note-on.
[0030]
In the next step S32, it is determined whether or not the same key as the key corresponding to the currently reproduced clip has been pressed. When a key different from the previously pressed key is pressed, the process proceeds to the next step S33. Here, if the key is depressed for the first time, it is assumed that the process proceeds to the next step S33.
[0031]
In step S33, the head address is set in the loop head register in order to read out the video clip corresponding to the note number. Then, the process proceeds to the next step S34 to start reproduction (PLAY). That is, the video clip is played from the beginning. In the next step S35, the timer counter starts counting in accordance with the time progress of the video clip being reproduced. This timer counter is provided in the CPU 106, for example.
[0032]
When the same key is depressed in step S32, the process proceeds to step S36, and the position corresponding to the address stored in the loop head register is set. Then, the process proceeds to the next step S34, and the reproduction of the video clip is started.
[0033]
FIG. 4 is a flowchart when note-off is performed.
[0034]
In step S41, when the key is released and note-off is performed, the program is activated. When note-off is detected by the control means 106, the timer counter that has been counted in the note-on processing routine is stopped in the next step S42. The timer counter value at that time is temporarily stored, for example, in a register in the CPU. The stored count value is compared in advance with, for example, a predetermined value set in another register in the CPU. If it is determined in this comparison that the value is equal to or greater than the predetermined value, the process proceeds to the next step S44. In step S44, the loop head register is rewritten and updated. When this update is performed, processing based on the updated value is performed in step S36 shown in the flowchart of FIG. Since the reproduction of the video continues even after the note-off is performed, the reproduction start position is set here.
[0035]
Details of the operation will now be described with reference to FIG.
[0036]
From now on, it is assumed that the key-on is note-on, the key release is note-off, the note-on process of FIG. 3 is performed at the note-on, and the process of FIG. 4 is performed at the note-off.
[0037]
FIG. 5 is a timing chart showing an operation performed in the video reproduction apparatus.
[0038]
FIG. 5 (a) shows the operation time of the operator, with the horizontal axis indicating time and the vertical axis indicating amplitude. In the figure, the time from note-on to note-off is shown as a pulse waveform.
[0039]
FIG. 5B shows the playback state of the video clip, and shows how the playback state of the video clip can be changed according to the key depression shown in FIG.
[0040]
In FIG. 5A, the operation status from note-on to note-off of one key in the keyboard device 110 is shown according to the transition of time. Numbers are shown over time. From now on, it will be assumed that one pulse waveform is numbered.
[0041]
FIGS. 5A and 5B show that a playback start instruction can be given by note-on of one key in the keyboard device 110 and a playback start position can be set by note-off. The rising part of the pulse waveform is note-on, and the falling part of the pulse waveform is note-off. Further, the time from note-on to note-off, that is, the pulse width corresponds to the timer count value in the routine shown in FIG. That is, one key is shared by the reproduction start instruction means and the reproduction start position setting means, and the reproduction start instruction is set when note-on is performed and the reproduction start position is set when note-off is performed.
[0042]
The processing will be described in detail with reference to FIGS.
[0043]
First, when any one of the keyboard devices is pressed, the corresponding video clip is played back. FIG. 5B shows the playback state of this video clip. On the left side of FIG. 5B, a situation A in which a video clip is reproduced by the rise of the first pulse waveform 1 is shown. In the situation of FIG. 5 (b) A, since the video clip is being played back and there is no note-on at the keyboard device while reaching the final point, the situation in which playback is performed from the beginning is shown in part B. In the part A, the routine shown in FIG. 3 is performed, and the processes of steps S31 to S35 are performed. In step S35, the timer counter is started, and note-off is performed without taking time from note-on as shown in FIG. 5A. Therefore, the process of FIG. 4 is also performed simultaneously with note-off. However, since the time is short as can be seen from the width of the pulse waveform 1, the process of S44 is skipped in the determination step of S43. Therefore, the loop head address is not updated. Since the final point of the video clip has been reached, the loop start address is referred to and the video clip is reproduced from the beginning. This situation is indicated by B.
[0044]
At this time, the next note-on is performed. Here, note off is performed without taking time from note on as shown in pulse waveform 2, and a video clip is reproduced from the beginning as indicated by C in the figure.
[0045]
Then, the next note-on is performed. Here, as can be seen from the pulse waveform 3, it takes time from note-on to note-off.
[0046]
Therefore, as indicated by D in the figure, when the note-off is performed, the loop head address in FIG. 4 is rewritten. Here, the pattern is indicated by a one-dot chain line. That is, the processing of FIG. 4 is started when note-off is performed, and the loop head address is updated in step S44 in the determination step 43 of the routine of FIG.
[0047]
Then, as shown by the pulse waveform 4, when note-on is performed immediately after note-on is performed, a video clip is reproduced from the portion indicated by the alternate long and short dash line. This indicates that the loop head address is updated when note-off is performed at the portion indicated by D in the figure.
[0048]
Next, as shown by the pulse waveform 5, since note-on is performed immediately after note-on is performed, the same processing is repeated. Since note-on is not performed for a while from now on, as shown by F in the figure, the video clip is reproduced to the last point. Here, when the final point is reached, the control means detects that the final point has been reached, and the loop head address is reset. This is done by detecting that the address information monitored by, for example, a counter of the control means has reached its final position. At this time, the loop head address is reset and the video clip is played back from the head.
[0049]
Then, as indicated by G in the figure, when the next note-on is performed during playback from the top, playback is started from the top again. Since it takes time until note-off as shown in the pulse waveform 6, the loop head address is updated. This is indicated by H in the figure.
[0050]
Playback is started from the address updated at the next note-on. As can be seen from the pulse waveform 7 at this time, since it takes time from note-on to note-off, the loop head address is also updated here. This is the portion indicated by I in the figure.
[0051]
As can be seen from the pulse waveform 8, reproduction is performed from the address updated at the next note-on. Then, playback is performed up to the last point, the loop head address is reset, and playback is started from the head again in K in the figure.
[0052]
By doing so, it becomes possible to perform both the instruction to start playback of the video clip and the setting of the playback start address with a single operator. If it is desired to reset the loop start address set in the middle, the video clip may be played to the last point. Therefore, the video can be reproduced from the place where the reproduction is desired only by operating the key of the keyboard device. Therefore, the variation of reproduction becomes rich.
[0053]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a video playback apparatus that can perform playback with richer variations than the conventional one.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a circuit configuration of a video reproduction apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing an outline of processing performed by control information storage means of a video reproduction apparatus according to an embodiment of the present invention.
FIG. 3 is a flowchart showing processing performed when a keyboard device is pressed.
FIG. 4 is a flowchart showing processing performed when a keyboard device is released.
FIG. 5 is a timing chart showing an operation when the processing shown in FIGS. 3 and 4 is performed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Video reproduction apparatus 101 Video clip storage means 102 Video reading means 103 Video effect means 104 Video signal output means 105 Control information storage means 106 Control means 107 Display means 108 Control parameter input setting means 109 Interface 110 Keyboard apparatus 111 Video projector

Claims (1)

A video storage unit for storing a plurality of videos;
A keyboard consisting of multiple keys,
Instruction means for instructing playback of the video corresponding to the note number of the key pressed;
Detecting means for detecting a velocity when the key is depressed;
A video playback unit that reads out a video instructed by the instruction means from a plurality of videos stored in the video storage unit and performs loop playback;
The video playback unit is given a video playback start instruction to switch the video currently being played back to the video instructed by the instruction means at the key pressing timing, and a new key press is performed after the key is released. Until there is a video playback control unit that continues to play the current video,
The video playback control unit continuously presses the same key at the position on the time axis of the video being played at the key release timing on condition that the key has been pressed for a predetermined time or longer. Set as the video playback start position when
The video playback apparatus, wherein the video playback unit switches videos in a crossfade time corresponding to the detected velocity.

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