JP2003289508A - Multimedia reproducing apparatus and multimedia reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a reproduction quality by optimally reproducing multimedia data. <P>SOLUTION: An address control part 201 controls an address of a buffer 202 and stores a text sample and a reproduction starting time in the buffer 202 as table data. Based upon the data, a time measuring part 204 finds a reproduction duration. According to a reported reference time, an output synchronizing part 203 outputs the data synchronously with the other media buffer part. A decode part 205 immediately decodes the inputted text sample and outputs it to a display buffer 207. A speed control part 206 calculates a scroll speed of the text data from the inputted reproduction duration and controls the scroll speed by controlling an output timing of the display buffer 207 based upon the calculated scroll speed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia reproducing apparatus and a multimedia reproducing method applied to multimedia processing, moving image processing or the like.

[0002]

2. Description of the Related Art As represented by a DVD (Digital Video Disk) player, a multimedia data reproducing apparatus for reproducing multimedia data in which data such as audio, video and text are multiplexed in real time is generally used. It's coming. This device separates and synchronously reproduces these multimedia data in real time.

Conventionally, as a multimedia reproducing apparatus,
There is one described in JP-A No. 11-75155.

The storage format of multimedia data handled by this apparatus is a DV format used for storing audio and video in a DV (Digital Video) cassette, or a software player on a personal computer, which is a multiplexed format including text. QuickTime format ("Quick
Time File Format ", March 27, 2001, Apple Computer
Inc. 2000).

And, in general, these data are
A reproduction start time is added separately from the sample of AV (Audio Visual) data. The decoding unit of each medium synchronizes with each other using the reproduction start time, so that, for example, when data is voice, PCM (Pulse Code Modul)
ation) is output to the speaker and the data is video,
The bitmap data of one frame is output to the monitor.

Here, the sample means a data unit having a constant processing time in a media stream which is continuous encoded data, such as video and audio frames. For example, MPEG4 (Moving Pic
ture Experts Group-4) Video VOP (Video Obje)
ct Plane), AMR (Adaptive Multi Rate) 20m
This corresponds to a text character string that is displayed at one time, such as an s frame or a phrase of a movie subtitle.

There are roughly two methods of reproducing data output in synchronization with the decoding unit of each medium, as follows.

The first is a case of video data, in which a frame output at a certain timing is continuously reproduced until the next frame is input.

The second is the case of voice data, which is determined to continue to be reproduced for a certain period of time, so that the voice may be interrupted by updating the data every certain period of time. Can be played without.

[0010]

However, in the conventional multimedia reproducing apparatus, since the reproducing speed is constant, for example, when the sample data output in synchronization is not at a constant interval, or the data display is operated. In such a case, there is a problem that the reproduction of the data cannot be done in time because the reproduction speed is slow, or the reproduction of the data ends early because the reproduction speed is high.

For example, the above-mentioned QuickTime format text media has a function of displaying text data while scrolling.

As described above, in the case of data accompanied by a scroll operation, the decoding unit cannot determine when the next sample data will be input. Therefore, the scroll speed is set to a constant value.

In such a case, depending on the input timing of the next sample or the amount of data, the text may not be completely displayed and the next sample may be displayed or the text may be scrolled out and then displayed. Since there is no text to display, the display operation may be unattractive such that nothing is displayed for a while.

The present invention has been made in view of the above points, and it is possible to optimally reproduce multimedia data and improve the reproduction quality of multimedia data. The purpose is to provide a method.

[0015]

A multimedia reproducing apparatus of the present invention comprises an obtaining means for obtaining a reproduction continuation time of unit data, which is a processing unit when reproducing multimedia, and a reproduction continuation obtained by the obtaining means. And a reproducing means for reproducing unit data based on time.

According to this structure, since the reproduction continuation time of the unit data which is a processing unit when reproducing the multimedia is obtained and the unit data is reproduced based on the reproduction continuation time, the multimedia data is optimized. It can be played back and the playback quality of multimedia data can be improved. Further, since the structure is simple, the present invention can be realized without largely changing the existing structure.

In the multimedia reproducing apparatus of the present invention having the above-mentioned structure, the acquiring means determines the unit data to be reproduced this time from the difference between the reproduction start time of the unit data to be reproduced this time and the reproduction start time of the unit data to be reproduced next time. Adopt a configuration to obtain the playback duration.

According to this structure, the reproduction continuation time is calculated by using the reproduction start time included in the unit data, and therefore the reproduction continuation time can be calculated by applying the existing communication system, and is immediately implemented. be able to.

In the multimedia reproducing apparatus of the present invention having the above-mentioned configuration, the reproducing means further has a calculating section for calculating the reproduction speed of the unit data based on the reproduction continuation time obtained by the acquiring means, A configuration is adopted in which the unit data is reproduced using the reproduction speed calculated by the calculation unit.

According to this structure, since the reproduction speed is calculated based on the reproduction continuation time and the data is reproduced, the optimum reproduction speed can be set and the reproduction quality of the multimedia data can be improved. .

In the multimedia reproducing apparatus of the present invention, in the above-mentioned configuration, the reproducing speed uses a value obtained by dividing the amount of unit data by the reproducing continuation time.

According to this structure, since the reproduction speed is calculated by dividing the amount of unit data by the reproduction continuation time, it is possible that the reproduction ends too early and the reproduction is interrupted. In addition to preventing or preventing the playback from ending because the playback speed is too slow and starting the playback of the next data, it is possible to play the data at a constant playback speed. It is possible to improve the reproduction quality of multimedia data.

In the multimedia reproducing apparatus of the present invention having the above structure, when the reproducing means reproduces the unit data by scrolling on the display screen, the reproducing speed is the display screen of the unit data. A configuration is used in which a value obtained by dividing the above movement amount by the reproduction duration time is used.

According to this structure, when scrolling the unit data such as text on the display screen, the scroll speed is calculated by dividing the movement amount on the display screen by the reproduction continuation time, so that the scroll speed is high. It is possible to prevent the playback from being interrupted because the scrolling ends too early because it is too fast, or to prevent the playback of the next data from starting because the scrolling is too slow and the scrolling does not end. In addition to the above, data can be reproduced at a constant scroll speed, and the reproduction quality of multimedia data can be improved.

In the multimedia reproducing apparatus of the present invention, in the above structure, the reproducing speed is a speed at which the unit data is continuously reproduced until the reproduction continuation time elapses.

According to this structure, the reproduction speed is set so that the reproduction of at least the unit data is continued until the reproduction continuation time ends, so that the reproduction speed is too fast and the reproduction ends early, and the reproduction is interrupted. It is possible to prevent that.

The multimedia reproducing apparatus of the present invention has the above-mentioned structure, wherein the reproducing speed is a speed at which all the unit data are completely reproduced by the time the reproducing continuation time elapses.

According to this structure, the reproduction speed is set so that at least all the unit data is reproduced by the end of the reproduction continuation time. Therefore, since the reproduction speed is too slow, the reproduction is not completed and the next data is reproduced. It is possible to prevent the reproduction from starting.

In the multimedia reproducing apparatus of the present invention having the above structure, the reproducing means reproduces the unit data so that the unit data moves on the display screen.
When the reproduction speed is equal to or higher than a preset threshold value, the unit data is reproduced so that the unit data is fixedly displayed on the display screen.

According to this structure, when the reproduction speed is equal to or higher than the preset threshold value, the reproduction is performed so that the unit data is fixed on the display screen. Therefore, the calculated reproduction speed is too fast, When it is difficult for a person to discriminate the data when the speed is set, it is possible to change the reproduction method to the fixed reproduction, and to realize proper data reproduction.

In the multimedia reproducing apparatus of the present invention having the above-mentioned structure, the acquisition means informs that the next unit data does not exist if the next unit data does not exist at the start of reproducing the unit data this time. If the reproduction continuation time obtained by the acquisition means is the first notification information, the reproduction means reproduces the unit data by using a preset reproduction speed. Adopt a configuration that does.

According to this structure, when the next unit data does not exist, the information is acquired as the reproduction continuation time, and the unit data is reproduced using the reproduction speed preset based on this information. Even when the next unit data is not in time for the playback start timing, such as during streaming playback in which encrypted data is sequentially played back while being downloaded, it is possible to calculate the playback duration and continue playback without interruption. be able to.

In the multimedia reproducing apparatus of the present invention, in the above configuration, when the unit data of this time is the last, the second unit data is notified that the unit data of this time is the last.
An addition means for adding notification information as the next unit data,
Further comprising in front of the acquisition means, the reproduction means,
When the reproduction duration obtained by the acquisition means is based on the second notification information, the reproduction is stopped after the reproduction of the last unit data before the addition of the unit data by the addition means is completed.

According to this configuration, when the unit data is the last, the information is added as the unit data, and the reproduction continuation time is calculated based on this, so that the data decoding unit determines the reproduction continuation time of the final data. It can be known, and since the reproduction is stopped after reproducing the last unit data, the reproducing operation can be normally terminated.

The communication terminal device of the present invention has a configuration having any one of the above multimedia reproducing devices.

With this configuration, it is possible to provide a communication terminal device having the same effects as the above.

The multimedia reproducing method of the present invention comprises an obtaining step for obtaining a reproducing duration of unit data, which is a processing unit for reproducing multimedia, and unit data based on the reproducing duration obtained by the obtaining step. And a reproducing step for reproducing.

According to this method, the reproduction continuation time of the unit data, which is a processing unit when reproducing the multimedia, is obtained, and the unit data is reproduced based on this reproduction continuation time, so that the multimedia data is optimized. It can be played back and the playback quality of multimedia data can be improved. Further, since the structure is simple, the present invention can be realized without largely changing the existing structure.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is to obtain a reproduction continuation time of unit data which is a processing unit when reproducing multimedia, and reproduce the unit data based on the reproduction continuation time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing an example of the configuration of a multimedia reproducing apparatus according to Embodiment 1 of the present invention. Here, a case where a sound is emitted from a speaker, an image is reproduced on the screen of the monitor, and text is scroll-displayed as a telop in the image will be described as an example.

In FIG. 1, a recording medium 101 is a memory for storing multimedia data to be reproduced. The memory is, for example, a non-volatile memory and is a memory for storing data after receiving the data by the HTTP protocol.

The multiplexed data separating unit 102 is used for the recording medium 1
The format check of the multiplexed data input from 01 or the reproduction possibility determination is performed. Also, the audio, video, and text media data are separated on a sample-by-sample basis, and the audio media buffer section 10 is separated together with the reproduction start time.
3 to the video media buffer unit 106 and the text media buffer unit 108. At this time, the data is output while checking the free information of the media buffer. Basically, it is a stuffed type that does not make space in the buffer.

The reproduction control unit 111 includes a multiplexed data demultiplexing unit 102, an audio media buffer unit 103, and an audio decoding unit 1.
04, video media buffer unit 106, video decoding unit 10
7. Control of playback start, pause, seek, and the like for the text media buffer unit 108 and the text decoding unit 109. In addition, in the video sample, in addition to the decoding of the data, a signal for controlling the display of each video frame which is one image after decoding may be sent from the video media buffer unit 106 to the video decoding unit 107. .

The audio media buffer unit 103 compares the system reference time notified from the reference timer 112 with the reproduction start time stored in the buffer, and sends the sample data to the audio decoding unit 104 at a desired timing. Output. Also, under the control of the reproduction control unit 111,
Performs operations such as starting data output, stopping data output, or clearing data in the buffer. However, the multiplexed data demultiplexing unit 102 may perform the same control.

The voice decoding unit 104 immediately decodes the input sample data, outputs it to the speaker 105, and makes a sound.

The video media buffer unit 106 and the video decoding unit 107 perform the same processing on the video media as the audio media buffer unit 103 and the audio decoding unit 104, and output the video data to the monitor 110.

The text media buffer unit 108 and the text decoding unit 109 are provided for the text media and the voice media buffer unit 103 and the voice decoding unit 1 described above are used.
The same processing as 04 is performed and the text data is output to the monitor 110.

Next, the text media buffer unit 10
8 and the internal configuration of the text decoding unit 109 will be described with reference to FIG.

In FIG. 2, the address control unit 201
By controlling the address of the buffer 202, the input reproduction start time and the text media sample are stored in the buffer 202 in the table data format.

The buffer 202 is an address control unit 201.
Stores the text data output from the output synchronization unit 2
It is output at the timing obtained from 03. In general, this buffer uses a ring buffer structure that stores a fixed number of table data in a ring shape.

Since the reference timer 112 informs the output synchronizing section 203 of the system reference time, the buffer 20
The reproduction start time in the table data stored in 2 is compared with the reference time, and if they match, the text sample is output to the text decoding unit 109.

The time measuring unit 204 obtains the difference between the reproduction start time of the text sample output this time and the reproduction start time of the text sample output next time from the table data stored in the buffer 202, and as the reproduction continuation time,
It outputs to the decoding unit 205 and the speed adjusting unit 206.
This utilizes that the buffer 202 always stores the reproduction start time and the table data of the sample data for a plurality of times. However, at the time of streaming reproduction or the like, there is a possibility that the data to be output next time has not arrived yet, so in this case, there is not a plurality of such data.

The decoding unit 205 immediately decodes the input text sample and outputs it to the display buffer 207.

The speed adjusting unit 206 calculates the scroll speed of the text data described later from the reproduction continuation time measured by the time measuring unit 204, controls the output timing of the display buffer 207 based on this speed, and scrolls. Adjust the speed.

The display buffer 207 has a speed adjusting unit 206.
Using the scroll speed adjusted by the monitor 110, the media sample output from the decoding unit 205 is monitored.
Output to.

Next, the text media buffer unit 10
The operation of No. 8 will be described using the flow of FIG.

The time measuring section 204 calculates the reproduction continuation time of the text sample output this time from the table data stored in the buffer 202 (ST301).

The output synchronization section 203 acquires the system reference time from the reference timer 112 (ST302), compares the reproduction start time and the reference time in the table data stored in the buffer 202, and determines whether it is the reproduction timing. It is determined (ST303).

When the reproduction start time coincides with the reference time, the text sample and the reproduction continuation time obtained above are output to the decoding unit 205 (ST304).

With the above configuration, specifically, the following effects are expected.

For example, in the case of the QuickTime format text medium described above, the sample data is
(1) display character string, (2) display position designation, (3) designation of character color and background color (including the position of characters for which this effect is effective), (4) character type (characters for which this effect is effective) Is included), and (5) scroll method (scroll direction, display start position and display end position) is specified.

FIG. 4 shows a specific example of the text sample of (5) above. Here, this text sample is a data that has the display function that the display character string is "Scroll in & out, Horizontal ..." and the character string is scrolled from outside the screen right to outside the screen left. Is.

The text decoding unit 109, to which the text sample data having these functions is input, creates a graphic for the text according to the specified value, that is, data in a format that can be displayed on the monitor, until the next sample data comes. It will be displayed.

In the case of the text sample data of (1) to (4), since the displayed character does not move, the same data is fixedly displayed without being updated until the next sample data comes. That is, there is no great difference between the conventional device and the multimedia reproducing device according to the present invention.

However, in the data including the scroll operation as in (5), the text decoding unit in the conventional apparatus cannot determine when the next sample data is input, so the scroll speed is set to a constant speed.

However, if the scroll speed is constant, the text of the next sample is displayed or nothing is displayed for a while after scrolling out depending on the input timing of the next sample without completely displaying the text. It will result in unnatural operation such as. However, since the playback operation can be performed even with this, strictly speaking, it is not a violation of the decoding regulation.

In the multimedia reproducing apparatus according to the present embodiment, the time measuring unit 20 is different from the text decoding unit 109.
Since the reproduction continuation time is given by 4, the text decoding unit 109 can calculate the scroll speed, for example, by the formula “moving distance / reproduction continuation time”. Therefore,
The text decoding unit 109 can complete the scroll display effect of the text in the reproduction continuation time, and can smoothly transition to the display of the next text. It should be noted that the scroll speed obtained by the above equation may be set to be slightly higher so that the scroll ends with a margin just before the end of the reproduction continuation time.

The time used for updating the display in the text decoding unit 109 is managed by the internal clock of the text decoding unit 109 or the time when the reproduction control unit 111 synchronizes with each media buffer unit. Decoding unit 10
It is realized by being notified to 9.

If the calculated scroll speed is equal to or higher than a preset threshold value, the text scroll may be stopped and the text display position may be fixed. This makes the scroll speed too fast,
It is possible to avoid a situation in which a person cannot distinguish a character.

As described above, according to the present embodiment, since the reproduction continuation time of the unit data which is the processing unit when reproducing the multimedia is obtained and the unit data is reproduced based on this reproduction continuation time, You can adjust the data playback speed etc. to play multimedia data optimally.
It is possible to improve the reproduction quality of multimedia data. Further, since the structure is simple, the present invention can be realized without making a large change to the existing structure.

(Second Embodiment) The configuration of the multimedia reproducing apparatus according to the second embodiment of the present invention is the same as that of the first embodiment, and the description thereof will be omitted.

The feature of this embodiment is that the time measuring unit 204
The speed adjusting unit 206 further has the function described below.

If the next output sample data does not exist at the time of measuring the reproduction duration, the time measuring unit 204 outputs "-1" as the reproduction duration as "reproduction duration measurement impossible" information.

When the speed adjusting unit 206 receives "-1" as the reproduction duration time from the time measuring unit 204, the speed adjusting unit 206 displays the data using a preset fixed scroll speed. If the text goes off the screen at the end of scrolling, nothing is displayed until the next text is entered.If the text is stopped in the display area, the next text is entered. It will be stopped until it is told. This is the same operation as the conventional device.

With the above configuration, not only in the case of reproducing the local file in which the next sample always exists, but also in the case where the next sample is input or unknown streaming reproduction is performed depending on the communication line condition. Even in the case, it will be possible.

In the streaming reproduction, the data is sequentially reproduced when the download is continued, but when the data does not exist, it is general to wait for the data in a pause state.

As described above, according to the present embodiment, when the next unit data does not exist, the information is acquired as the reproduction continuation time, and based on this, the unit data is acquired using the reproduction speed preset. In the case of streaming reproduction in which multiplexed data is sequentially reproduced while being downloaded, the reproduction continuation time can be calculated even if the next unit data is not in time for the reproduction start timing. You can continue without cutting.

(Third Embodiment) FIG. 5 is a block diagram showing the configuration of a multiplexed data demultiplexing unit 102a of a multimedia reproducing apparatus according to a third embodiment of the present invention. In addition,
The entire multimedia reproducing apparatus has the same basic configuration as the multimedia reproducing apparatus shown in FIG.
The description is omitted.

The feature of this embodiment is that a multiplexed data demultiplexing unit 102a having the following functions is provided instead of the multiplexed data demultiplexing unit 102 shown in FIG.

In FIG. 5, the multiplexed data separation controller 5
01 separates each media sample from the input multiplexed data, extracts the reproduction start time from the data, and outputs them to the media buffer.

The final sample determination unit 502 determines whether or not the sample is the last in the multiplexed data. The information as to whether it is the last is generally included in the end of the file or the header information of the multiplexed data.

The non-display sample inserting section 503 inserts the sample data of length 0 as a non-display sample into the multiplexed data. Here, as the value of the reproduction start time of the non-display sample, the reproduction end time of the multiplexed data is used. The reproduction end time, that is, the total reproduction time is generally included in the header information of the multiplexed data.

The text media buffer unit 108 is set so as not to output to the text decoding unit 109 when the sample data of length 0 is input.

Next, the operation of the multiplexed data demultiplexing section 102a will be described with reference to the flow chart shown in FIG.

The multiplexed data separation control unit 501 separates samples of each medium from the input multiplexed data,
At the same time, the process of extracting the reproduction start time from the data is performed (ST601).

The final sample determination section 502 determines whether or not the sample is the last in the multiplexed data (ST.
602).

When the data is the final sample, non-display sample inserting section 503 inserts the non-display sample into the multiplexed data (ST603).

FIG. 7 shows an example of table data stored in the text media buffer unit 108 with the above configuration.

In the conventional device, the sample number Las
The data of t becomes the end of the table data. in this case,
The text media buffer unit 108 that has received the Last sample cannot refer to the next reproduction start time from the table data, and therefore cannot calculate the reproduction continuation time.

However, according to the present embodiment, Last +
By storing up to one sample, the reproduction duration of the Last sample can be calculated. Further, since the text media buffer unit 108 is set so as not to output the sample having the length of 0, the consistency with the text decoding unit 109 is maintained.

As a result, even in the final sample, the text decoding unit 109 can know the reproduction continuation time, and since the reproduction is stopped after reproducing the last reproduction data, the multimedia reproducing apparatus can be normally operated. It can be operated.

Note that this embodiment can also be used in combination with the second embodiment.

The multimedia reproducing apparatus according to the present invention is
It can be installed in a mobile phone or a PDA (Personal Digital Assistant), and this makes it possible to improve the quality of text display when, for example, streaming playback of multiplexed data including the above-mentioned text media or local playback is performed. You can browse the content in good condition.

Here, the case where the multimedia reproducing apparatus according to the present invention is configured by hardware has been described as an example, but it can be realized by software.

Further, the case where the present invention is applied to a text medium has been described as an example, but the present invention is not limited to text and can be applied to other media data.

[0097]

As described above, according to the present invention,
The multimedia data can be optimally reproduced by adjusting the data reproduction speed and the like, and the reproduction quality of the multimedia data can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of a multimedia playback device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a text media buffer unit and a text decoding unit according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the text media buffer unit of the multimedia playback device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a specific example of a text sample in a QuickTime format.

FIG. 5 is a block diagram showing a configuration in a multiplexed data demultiplexing unit of a multimedia reproducing apparatus according to a third embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of a multiplexed data demultiplexing unit of the multimedia reproducing apparatus according to the third embodiment of the present invention.

FIG. 7 is a diagram showing an example of table data stored in a text media buffer unit of the multimedia playback device according to the third embodiment of the present invention.

[Explanation of symbols]

102, 102a Multiplexed data separation unit 103 audio media buffer section 104 voice decoding unit 105 speaker 106 video media buffer section 107 video decoding unit 108 Text media buffer section 109 Text decoding part 110 monitor 204 hour measurement section 206 Speed adjustment unit 501 multiplexed data separation control unit 502 Final sample determination unit 503 Non-display sample insertion part

Claims (12)

[Claims] 1. An acquisition unit for obtaining a reproduction duration of unit data, which is a processing unit when reproducing multimedia, and a reproduction unit for reproducing the unit data based on the reproduction duration obtained by the acquisition unit. A multimedia playback device comprising: 2. The acquisition means obtains the reproduction continuation time of the unit data to be reproduced this time from the difference between the reproduction start time of the unit data to be reproduced this time and the reproduction start time of the unit data to be reproduced next time. Item 1. The multimedia playback device according to item 1. 3. The reproducing unit further includes a calculating unit that calculates a reproducing speed of the unit data based on the reproducing duration obtained by the acquiring unit, and uses the reproducing speed calculated by the calculating unit. The multimedia reproducing apparatus according to claim 1, wherein unit data is reproduced. 4. The multimedia playback apparatus according to claim 3, wherein the playback speed is a value obtained by dividing the amount of unit data by the playback duration. 5. The reproducing means reproduces unit data by scrolling on a display screen, wherein the reproduction speed is obtained by dividing a movement amount of the unit data on the display screen by the reproduction continuation time. The multimedia reproducing apparatus according to claim 3, wherein a value is used. 6. The multimedia playback device according to claim 3, wherein the playback speed is a speed at which playback of at least unit data continues until the playback duration time elapses. 7. The multimedia reproducing apparatus according to claim 3, wherein the reproducing speed is a speed at which all the unit data is completely reproduced before the reproduction continuation time elapses. 8. The reproducing means reproduces the unit data so that the unit data moves on the display screen, and when the reproduction speed is equal to or higher than a preset threshold value, the unit data is displayed on the display screen. 4. The multimedia reproducing apparatus according to claim 3, wherein the unit data is reproduced so as to be fixedly displayed. 9. The acquisition unit acquires, as the reproduction duration, first notification information for notifying that the next unit data does not exist when the next unit data does not exist at the start of reproduction of the current unit data. The reproduction unit reproduces the unit data using a preset reproduction speed when the reproduction duration obtained by the acquisition unit is the first notification information. Multimedia playback device. 10. A second notification for notifying that the current unit data is the last one when the current unit data is the last one.
An addition means for adding notification information as the next unit data,
Further includes in the preceding stage of the acquisition means, the reproduction means, when the reproduction duration time obtained by the acquisition means is based on the second notification information, the reproduction means is the last before the unit data is added by the addition means. The multimedia playback device according to claim 1, wherein the playback is stopped after the playback of the unit data is completed. 11. A communication terminal device comprising the multimedia reproducing device according to claim 1. Description: 12. An acquisition step of obtaining a reproduction duration of unit data, which is a processing unit when reproducing multimedia, and a reproduction step of reproducing the unit data based on the reproduction duration obtained by the acquisition step. A multimedia playback method comprising: