CN100376005C - Control method and chip for data loading in video and audio playing system - Google Patents

Abstract

The invention provides a control method for data loading in an audio-video playing system, which is used for playing audio-video data on a storage medium. The video data comprises a plurality of video segments and a plurality of navigation data respectively corresponding to the video segments. The method comprises the step of loading only one part of navigation data corresponding to an audio-video segment into a memory when the audio-video segment is played so as to control the audio-video playing system to play the audio-video segment.

Description

Data loading control method and chip in audio-visual playing system

technical field

The invention relates to a storage medium represented by an audio-visual disc and a control method for loading digital information thereof.

Background technique

In recent years, various audio-visual discs (such as: CD, VCD, SVCD, DVD) have become the focus of home entertainment, and digital versatile discs (digital versatile discs; DVDs) are the most popular among the public. One of the main reasons is that the user can arbitrarily designate the audio-visual content segment that he wants to enjoy, and the CD player can find the storage location of the audio-visual content segment on the audio-visual disc in a very short time and play it immediately. Users don't need to waste a lot of time looking for the audio and video clips they want to enjoy.

When a traditional digital versatile disc player (DVD player) is in operation, in order to provide the playback control function, after the user specifies the video and audio content segment that he wants to enjoy, all the corresponding audio and video content segments need to be Navigation data (navigation data) is loaded into the data memory of the optical disc player to provide relevant indicators for finding each audio-visual content segment. The navigation data includes complete video management information (video manager information; VMGI), video title set information (video title set information; VTSI), program chain information (program chain information; PGCI), playback control information (playback control information; PCI ) and data search infotmation (DSI).

In addition, when a traditional digital versatile disc player (DVD player) continuously plays different audio-visual segments, it is necessary to load all the navigation data of different audio-visual content segments into the data memory of the optical disc player in real time/dynamically, so as to In addition to efficiently playing the current video content, it can also efficiently load the video content to be played next, so as to reduce the probability of delay or freeze.

However, different audio-visual clips have different capacities and are distributed in different ways on storage media, which jointly cause different memory spaces occupied by different navigation data. Therefore, the size of the navigation data to be loaded each time is often different in this dynamic memory configuration mode, which often inevitably or causes fragmentation (fragmentation) of the data memory space, or causes vacancy of the data memory, so that The data memory space is used less efficiently.

Contents of the invention

The invention provides a data loading control method in an audio-visual playing system, which is used for playing audio-visual data on a storage medium. The audiovisual data includes a plurality of audiovisual clips and a plurality of navigation data respectively corresponding to the audiovisual clips. The method includes loading only a part of the navigation data corresponding to the audio-visual segment into the memory when playing an audio-visual segment, so as to control the audio-visual playing system to play the audio-visual segment.

The invention also provides a chip for data loading in an audio-visual playing system, which is used to play audio-video data on a storage medium. The audiovisual data includes a plurality of audiovisual clips and a plurality of navigation data respectively corresponding to the audiovisual clips. The chip includes a computing unit, a data memory and a program memory: the data memory is used to store the main part of loading; the program code is stored in the program memory, so that the computing unit can only load the relative A part of a navigation data in the video clip.

The content, features and advantages of the present invention are at least that only part of the navigation data related to playback control is loaded into the data memory of the CD player. Therefore, the required capacity of the data storage can be greatly reduced, and the optical disc player will not crash due to insufficient data storage resources due to loading a large amount of data. In addition, the present invention can further use the remaining resources of the data memory as a cache memory to improve the data processing efficiency of the optical disc player, especially the efficiency of accessing different navigation data of different video and audio segments. In addition, the present invention can also avoid the dynamic configuration of the memory space, so the fragmentation of the data memory space will not be caused, so as to reduce the problem of memory usage. Those skilled in this technology can better understand other benefits or other contents of the patented invention defined in the claims after reading the specification.

In order to make the above and other contents, features, and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of the structure of a data area of a digital versatile audio-visual disc.

FIG. 2 is a schematic diagram of the data structure of the video management information (VMGI) of the DVD data.

FIG. 3 is a schematic diagram of the data structure of the video title set information (VTSI) of the digital versatile video disc data.

FIG. 4 is a schematic diagram of the data structure of the program chain information (PGCI) of the digital versatile video disc data.

Fig. 5 is a schematic diagram of the data structure of part of the video management information downloaded according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the data structure of the downloaded part of video title group information according to an embodiment of the present invention.

FIG. 7a is a configuration diagram of memory subspaces in an embodiment of the present invention.

Fig. 7b is a configuration diagram of memory subspaces in another embodiment of the present invention.

FIG. 8 is a block diagram of a chip for playing selected data in a storage medium according to an embodiment of the present invention.

Explanation of reference symbols:

100～data area; 110～computer data area; 120～video data area; 121～control information; 122～video objects; 123～picture objects; 124～audio objects; 126～navigation data; 127～video management information; 128～ 129～program chain information; 130～computer data area; 500～partial film and television management information; 501～film and television management information management form; 503～title search index form; 505～film and television management form program chain information unit form; 507～parent management information form; 600～partial film and television title group information; 601～film and television title group information management form; 603～partial title search index table for film and television title group; 605～program chain information table for film and television title group; 607～film and television title group Form program chain information unit form; 710～memory subspace; 811～address space; 812～address space; 713～address space; 720～memory subspace; 725～part of memory space; 800～chip; ~program memory; 830~data memory; and 840~memory subspace.

Detailed ways

Please refer to Fig. 1, there is a data area 100 on a digital versatile audio-visual disc, and this data area has a hierarchical structure, and comprises the first computer data area (computer data area) 110 of most interleaves, corresponding to the first computer data area 110 Audio/video data area (audio/video data area) 120, a second computer data area 130 and a second audio/video data area (audio/video data area) 140 corresponding to the second computer data area 130 and so on.

In the lower layer of the video and audio data area 120, control information 121, video objects (videoobject) 122, picture objects (picture object) 123 and audio objects (audioobject) 124 are configured; Navigation data 126, the navigation data 126 mainly controls how to play audio-visual data, at least including audio-visual video management information (videomanager information; VMGI) 127, video title set information (video title set information; VTSI) 128, program chain information (program chain information; PGCI) ) 129, playback control information (playback control information; PCI) and data search information (data search information; DSI).

Figures 2 to 4 are schematic diagrams of the data structure of the complete video management information, video title group information and program chain information respectively. The complete film and television management information at least describes the film and television management information management table (video manager information management rable; VMGI_MAT), title search index table (tirle search pointer table; TT_SRPT), film and television management table program chain information unit table (video manager menu program chain information unit table; VGMG_PGCI_UT), parent management information table (parental management information table; PTL_MAIT), video title set attribute table (video title set attribute table; VTS_ATRT), text data manager (text data manager; TXTDT_MG), video management form unit Address table (video manager menu cell address table; VMGM_C_ADT) and video management form video object unit address map (video manager menu video object unit address map; VMGM_VOBU_ADMAP), as shown in Figure 2, the complete video title group information at least describes the video title Group information management table (video title set information management table; VTSI_MAT), video title set part-of-title search pointer table (video title set part-of-title search pointer table; VTS_PTT_SRRT), video title set program chain information table (video title set program chain information table; VTS_PGCIT), video title set menuprogram chain information unit table (video title set menuprogram chain information unit table; VTSM_PGCI_UT), video title set time map table (video title set time map table; VTS_TMAPT), video title set table video Object unit address map (video title set menu video object unit addressmap; VTSM_VOBU_ADMAP), video title set cell address table (video title set celladdress table; VTS_C_ADT), and video title set video object unit address map (videotitle set video object unit address map ; VTS_VOBU_ADMAP), as shown in Figure 3, the complete program chain information at least includes program chain general information (program chain general information; PGC_GI), program chain command table (program chain command table; PGC_CMDT), program chain program map (program chain program map; PGC_PGMAP), cell playback information table (cell playback information table; C_PBIT) and cell position information table (cell position information table; C_POSIT), as shown in Figure 4.

Because in the navigation data, not all information is related to the function of playback control, and some navigation information related to the playback control function has a certain specification and size (basically depends on the specification of the storage medium and the file format of the stored data. Specification). Therefore, a preferred embodiment of the present invention is to provide a method for loading data in an audio-visual playback system for playing audio-visual data on a storage medium. Wherein, the audio-visual data includes a plurality of audio-visual segments (such as multimedia files) and a plurality of navigation data respectively corresponding to the audio-visual segments (such as the location index of the multimedia files on the storage medium and the directory information of the multimedia files). The method is to load only a part of a navigation data corresponding to the audio-visual segment into a memory when playing a video-audio segment, so as to control the playback of the video-audio segment. For example, only part of the video management information, video title group information and program chain information may be loaded, and the rest of the navigation data may not be loaded. For another example, the loaded part of the navigation data is enough to point out the storage location of the on-demand audio-visual segment on the storage medium, so that the CD player can directly play the audio-visual segment.

For example, the loaded part of the video management information 500 may only include the video management information management table (VMGI_MAT) 501, the title search index table (TT_SRPT) 503, the video management table program chain information unit table (VGMG_PGCI_UT) 505, and parent management The information table (PTL_MAIT) 507, as shown in Figure 5; and the loaded part of the video title set information 600 only includes the video title set information management table (VTSI_MAT) 601, the video title set partial title search index table (VTS_PTT_SRPT) 603, Video title set program chain information table (VTS_PGCIT) 605 and video title set table program chain information unit table (VTSM_PGCI_UT) 607, as shown in Figure 6, the loaded program chain information includes program chain general information (PGC_GI), program Chain Command Table (PGC_CMDT), Program Chain Program Map (PGC_PGMAP), Cell Play Information Table (C_PBIT) and Cell Position Information Table (C_POSIT). Of course, the above-mentioned part of the navigation data loaded is only an example, and those skilled in the art can deduce how to increase or decrease the main part of the navigation data downloaded, and make the part of the navigation data loaded without downloading the other part of the navigation data. Part of the navigation data is enough to point out the storage location of the on-demand pictures and audio-visual clips on the storage medium, so that the CD player can directly play the audio-visual clips. Since only part of the navigation data related to play control (play control) is loaded into the memory of the optical disc player, the required memory capacity can be greatly reduced, and the memory resources will not be insufficient due to loading too much data. The disc player is down.

In addition, according to the aforementioned preferred embodiment, the maximum required storage capacity of each table in the part of the navigation data that may be downloaded can be further calculated in advance (for example, according to the specifications of the storage medium being processed), and can be stored in the data A fixed memory subspace is defined in the memory according to the sum of the maximum storage capacity required by each table, which is specially used to store the loaded part of the navigation data. As shown in Figure 7a, in the fixed memory subspace 710, the address space for storing each table can be further allocated according to the maximum memory space required by each information table; for example, if it is necessary to load Table 1, Table 2 , ... form n etc. have n tables altogether, divide an address space 711 according to the maximum capacity required by form 1, divide an address space 712 according to the maximum capacity required by form 2, and divide according to the maximum capacity required by form 3 An address space 713 . In this way, the starting position stored in each table is fixed instead of dynamically allocated in the memory, which can avoid the problem of fragmentation of the overall memory space and avoid the memory usage rate being affected by the fragmentation of dynamic configuration. Lowering the problem.

In addition, according to the aforementioned preferred embodiment, the maximum storage capacity required by each table in the part of the navigation data that may be downloaded can be further calculated in advance (for example, according to the specifications of the storage medium being processed), and stored in the memory A fixed memory subspace is defined according to the sum of the maximum storage capacity required by each table, which is specially used to store the loaded part of the navigation data. As shown in FIG. 7 b , in the fixed memory subspace 720 , the loaded tables are directly stored in the memory subspace successively. For example, if a total of n tables such as table 1, table 2, ... table n, etc. need to be loaded, the loaded table 1, table 2, ... table n will be directly stored in the memory sub- In the space 720; since the capacity of the defined memory subspace 720 is the sum of the maximum storage capacity required by each table, a part of the memory space 725 is usually left unwritten. At this moment, this part of the memory space 725 can be used as a cache memory (cache memory), used to fill in the relevant navigation data of adjacent video and audio content segments, until the entire memory subspace 720 is filled, so, if the current After the paragraph, just to process the audio-visual content of the adjacent segment, you can directly read the relevant navigation data from the memory subspace 720 without loading the corresponding navigation data from the audio-visual CD, thereby improving the performance of the CD player. Data processing efficiency.

Please refer to FIG. 8 , another embodiment of the present invention provides a chip 800 for playing selected data in a storage medium, for playing on-demand pictures and video clips on an audio-visual disc, and the chip 800 includes a computing unit 810 , a program memory 820, and a data memory 830. The data memory 830 is used to store the loaded part of the navigation data; the program memory 820 stores program codes, so that the calculation unit 810 can only load a part of the navigation data corresponding to the video and audio clip when playing an audio and video clip. Part of it is stored in the data memory, so as to control the playback of the video clip.

According to the foregoing embodiment 2, the program code can further enable the calculation unit 810 to calculate the maximum storage capacity required by each table in all possible downloaded partial navigation data of the storage medium (for example, according to the specification of the storage medium), and A fixed memory subspace 840 is defined in the data memory 830 according to the sum of the maximum storage capacity required by each table, which is specially used to store the loaded part of the navigation data. Certainly, in the fixed memory subspace 840, the address space to be stored by each table can be further allocated according to the maximum memory space required by each information table, and each table can be stored in the memory when loading the navigation data of the storage medium In this way, the starting position stored in each table is fixed, and there will be no fragmentation of the overall memory space due to the dynamic configuration of the memory space, so as to reduce the problem of memory usage.

In addition, according to the aforementioned preferred embodiment 2, the program code can further enable the calculation unit 810 to calculate the maximum storage capacity required by each table in all possible downloaded partial navigation data of the storage medium being processed, and store the maximum storage capacity in the data memory 830. A fixed memory subspace 840 is defined according to the sum of the maximum storage capacity required by each table, which is specially used to store the loaded part of the navigation data. In the fixed memory subspace 840 , the loaded tables are directly stored in the memory subspace 840 one after another. Since the capacity of the defined memory subspace 840 is the sum of the maximum storage capacity required by each table, a part of the memory space is usually left unwritten, and this part of the memory space can be used to fill in adjacent video and audio content The relevant navigation data of the segment is kept until the entire memory subspace is filled. In this way, if after processing the current paragraph, the adjacent paragraph happens to be processed, the relevant data can be read directly from the memory subspace without further processing. Load data from audio and video discs, thereby improving the data processing efficiency of the disc player.

To sum up, when a traditional optical disc player plays a certain audio-visual content segment, it will directly store all the navigation data corresponding to the audio-visual content segment in the data memory of the optical disc player. Improvements: One is that the required data memory capacity is huge, which may easily cause the CD player to crash due to insufficient memory resources during operation; the other is that different video and audio content segments require different memory capacities, so it is necessary to The data storage space is dynamically allocated to the navigation data, resulting in fragmentation of the data storage space. However, in the selected data playback method and chip in the storage system provided by the present invention, only part of the navigation data related to playback control is loaded into the data storage of the optical disc player, so the required data storage capacity can be greatly reduced, and The optical disc player will not crash due to insufficient data storage resources due to loading too much data, and even further use the remaining resources of the data storage as a cache memory to improve the data processing efficiency of the optical disc player; in addition, the present invention It can also avoid the dynamic configuration of the memory space, so the fragmentation of the data memory space will not be caused, so as to reduce the problem of memory usage.

Of course, the present invention is aimed at the improvement of how to control the playing of the audio-visual clips, rather than the encoding/decoding/correction of the content of the audio-visual clips and so on. Therefore, the present invention only improves the access of the navigation data; as for the part of the audio-visual segment, how to load it for encoding/decoding/correction when it is to be played, etc., can be the same as the known technology, and can also be applied to any new approach.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention shall prevail as defined by the appended claims.

Claims (12)

1. control method that the data that are used for a video-audio playing system are written into, in order to playing the video-audio data on the Storage Media, a plurality of navigation datas that this video-audio data includes a plurality of video and audio fragment and corresponds respectively to these video and audio fragment, this method comprises:

In the time that a certain video and audio fragment will be play, only be written into the part of a corresponding navigation data;

When calculating corresponds to these navigation datas, enough deposit the maximum memory capacity of arbitrary this navigation data of part that is written into;

In a storer,, delimit a memory subspace according to this maximum memory capacity; And

Loaded navigation data is stored in this memory subspace.

2. control method as claimed in claim 1, this control method be selected from following one of them:

I. only be written into a part of video display management information in this navigation data, a part of video display set of titles information and a program chain information at this;

Ii. only be written in this navigation data at this, in order to point out the part of the storage location of corresponding this video and audio fragment on this Storage Media;

Iii. be written in this navigation data, use so that the corresponding player of this Storage Media can be play-overed the part of this video and audio fragment;

Iv. only there is this navigation data of the part relevant to be written into Play Control.

3. control method as claimed in claim 1, when arbitrary this navigation data has comprised a plurality of information forms, this control method more comprises:

With this memory subspace, be divided into a plurality of address spaces; And

When being written into this navigation data of arbitrary part, deposit a plurality of information forms of each this navigation data of part in these address spaces respectively.

4. control method as claimed in claim 3, when being written into this navigation data of different parts, the distribution of these address spaces in this memory subspace can not change.

5. control method as claimed in claim 1, when this navigation data has comprised a plurality of information forms, this control method more comprises:

When being written into this navigation data of arbitrary part, with the part this navigation data a plurality of information forms successively deposit this memory subspace in.

6. control method as claimed in claim 1 more comprises:

When playing this video and audio fragment, be written into respect to the part in one second navigation data of one second video and audio fragment to this storer, the broadcast of this second video and audio fragment is to be connected in after this video and audio fragment.

7. chip that the data that are used for a video-audio playing system are written into, in order to playing the video-audio data on the Storage Media, a plurality of navigation datas that this video-audio data includes a plurality of video and audio fragment and corresponds to these video and audio fragment respectively, this chip comprises:

One computing unit;

One data-carrier store is the major part that is written in order to storage; And

One program storage, central storage one procedure code makes this computing unit carry out following steps:

When playing a video and audio fragment, only be written into the part of a navigation data that corresponds to this video and audio fragment;

When calculating corresponds to these navigation datas, enough deposit the maximum memory capacity of arbitrary this navigation data of part that is written into;

In this data-carrier store,, delimit a memory subspace according to this maximum memory capacity; And

Loaded navigation data is stored in this memory subspace.

8. chip as claimed in claim 7, this chip comprise following wherein a kind of variation at least:

I. this procedure code is to make only to be written into the audio-visual management information of a part in this navigation data, a part of audio-visual set of titles information and a program chain information;

Ii. this procedure code is to make only to be written in this navigation data, in order to point out the part of the storage location of corresponding this video and audio fragment on this Storage Media;

Iii. this procedure code is to make to be written in this navigation data, uses so that the corresponding player of this Storage Media can be play-overed the part of this video and audio fragment;

Iv. this procedure code is to make only to have this navigation data of the part relevant with Play Control to be written into.

9. chip as claimed in claim 7, wherein, this procedure code also makes this computing unit carry out the following step:

With this memory subspace, be divided into a plurality of address spaces; And

When being written into this navigation data of arbitrary part, deposit a plurality of information forms of this this navigation data of part in these address spaces respectively.

10. chip as claimed in claim 9, when being written into this navigation data of different parts, the distribution of these address spaces in this data-carrier store subspace can not change.

11. chip as claimed in claim 7, wherein, when this navigation data had comprised a plurality of information form, this procedure code also made computing unit carry out the following step:

When being written into this navigation data of arbitrary part, with the part this navigation data a plurality of information forms successively deposit this memory subspace in.

12. chip as claimed in claim 7, this procedure code more comprises following function:

When playing this video and audio fragment, be written into respect to the part in another navigation data of another video and audio fragment to this data-carrier store, the broadcast of this another video and audio fragment is to be connected in after this video and audio fragment.

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