CN1514441A - Method of indirectly locating DVD document using logic block number - Google Patents

Abstract

The method includes following steps: (1) reading out VMGI information in navigation file VIDEO_TS.IFO or VTSI information in navigation file VTS_##_0.IFO, here ## is number between 01-99; (2) LBN information in VMGI and VTSI is corresponding to a navigation file pointed from DVD-Rom medium or file name of audio/video file. (3) File is located by the file name obtained from step (2). Since DVD file is located through file name in the invention, thus, DVD file stored in non DVD-Rom medium can be navigational fixed so as to provide basis for interactive controlled playing.

Description

A kind of method with logical block number (LBN) indirect addressing DVD file

Technical field

The present invention relates to a kind of localization method of DVD file, more particularly, relate to a kind of method with logical block number (LBN) indirect addressing DVD file.

Background technology

The use player plays is stored in the DVD film in the DVD-Rom medium, can have powerful interactive play function, as carry out the selection of menu, language, captions and chapters and sections, and multi-angle is play, parents locking and VCR control etc.The realization of these functions depends on the correct location to the DVD file.

When the DVD film was stored in the DVD-Rom medium, this DVD-Rom medium must comprise a logical volume.Basic logic unit in the logical volume is exactly a logical block LB (logical block), has comprised 2048 bytes, and is corresponding with a physical sector.Logical block number (LBN) LBN is the abbreviation of English logical block number, and it is the serial number of logical block LB according to the physical location incremental order, and the LBN of first LB is 0, and the like.A volume consists predominantly of file structure, DVD-Video district and non-DVD-Video district.Video file is placed in the DVD-Video district, and computer data then is to be placed in the non-DVD-Video district.

The DVD-Video district has comprised a Video Manager (VMG) and 1 to 99 video-program set (VTS), that is to say that the DVD-Video district has comprised all necessary files that are used for the DVD playing back video, has been realized the interactive function of selecting by VMG and VTS two parts in the DVD tv screen.In the DVD-Rom medium, between the video-program set (VTS), between video-program set (VTS) and the Video Manager (VMG), store not necessarily continuously, might there be the LBN space.

Video Manager VMG forms .VMGI by VMGI (Video Manager Information), VMGM_VOBS (VideoObject Set for VMG Menu) and VMGI (BUP) and is stored in the navigate file VIDEO_TS.IFO, and it has comprised all mutual control informations in DVD-Video district.VMGM_VOBS is stored in the file VIDEO_TS.VOB, and it has comprised the video content of program choice menus.VMGI (BUP) is stored in the file VIDEO_TS.BUP, and it is the copy fully of VMGI.VMGM_VOBS is dispensable, but VMGI and VMGI (BUP) must exist.In the DVD-Rom medium, file VIDEO_TS.IFO, VIDEO_TS.VOB (if there is), VIDEO_TS.BUP leave in the DVD video disc in proper order, and the centre does not have the LBN space.

Each video-program set VTS is made up of VTSI (Video Title Set Information), VTSM_VOBS (VideoObject Set for the VTS Menu), VTSTT_VOBS (Video Object Set for Titles in a VTS) and VTSI (BUP).VTSI is stored in the navigate file VTS_##_0.IFO, and it has comprised all mutual control informations of this video-program set VTS.VTSM_VOBS is stored in the file VTS_##_0.VOB, and it has comprised the video content of all choice menus of this video-program set VTS.VTSTT_VOBS is stored in a plurality of file VTS_##_*.VOB, and it has comprised all video contents that video-program set is play.VTSI (BUP) is stored in the file VTS_##_0.BUP, and it is the copy fully of VTSI.VTSM_VOBS is not essential, but VTSI, VTS_##_*.VOB and VTS_##_0.BUP must exist.Above ## represents two digits, between 01-99; * represent one-bit digital, between 1-9.In the DVD-Rom medium, VTS_##_0.IFO, VTS_##_0.VOB (if there is), VTS_##_*.VOB, VTS_##_0.BUP leave in the DVD video disc in proper order, and the centre does not have the LBN space.

During DVD film in DVD playing back-Rom medium, in order to realize the interactive function of DVD, DVD player must be located the DVD file according to user's selection, and its localization method comprises the steps:

1) when the beginning DVD playing back, just when VMG-space (Video Manager district), DVD player at first finds the LBN of navigate file VIDEO_TS.IFO in the DVD-Video district, and removes to read the VIDEO_TS.IFO file by this LBN parameter and obtain VMGI information.

2) player begins to play first PGC, later on other navigate file that just provides according to VMGI of player or audio-video document add simultaneously that with respect to the LBN of VIDEO_TS.IFO the LBN information of VIDEO_TS.IFO oneself removes to read navigate file or audio-video document as parameter afterwards.When being played to certain VTS-space (video-program set district), other navigate file that player provides according to VTSI or audio-video document be with respect to the LBN information of VTS_##_0.IFO, removes to read other navigate file or audio-video document as parameter after adding the LBN information of VTS_##_0.IFO oneself simultaneously.

DVD player is by removing positioning video file or other navigate file with respect to the LBN information of VMGI or VTSI in a word.

But, this localization method does not have with filename as parameter, but remove to read navigation data or audio, video data as the physical address of DVD-Rom medium by the LBN parameter, when so in case the DVD file breaks away from the storage medium of DVD-Rom, LBN information has just lost its physical significance, just can not remove to read navigation data or audio, video data with LBN information, spectators also just can't have a taste of the powerful interactive function of DVD.

Summary of the invention

The objective of the invention is in order to overcome the deficiency of existing DVD document alignment, by removing to locate the DVD file as parameter with filename, thereby provide a kind of with logical block number (LBN), be the method for LBN indirect addressing DVD file.

Technical scheme of the present invention is:

A kind of method with logical block number (LBN) indirect addressing DVD file comprises the steps:

1) read VMGI information among the navigate file VIDEO_TS.IFO or the VTSI information among the navigate file VTS_##_0.IFO, wherein ## represents two digits, between 01-99;

2) the LBN information among VMGI and the VTSI is corresponded to the navigate file that this LBN points to or the filename of audio-video document on the DVD-Rom medium;

3) by step 2) filename that obtains location this document.

Wherein, LBN information obtains as follows with the corresponding of filename of navigate file or audio-video document step 2):

A) respectively with the file size byte number of each file of DVD-Video district divided by 2048, convert the LBN number to; Then the LBN of All Files among the VMG is counted addition and obtain the shared LBN sum of VMG, respectively the LBN of the All Files among the VTS is counted addition and obtain the shared LBN sum of each VTS

B) obtain the LBN number of VTS_##_0.IFO by VTSN in the TTSRP data structure that comprises among the navigate file VIDEO_TS.IFO and VTS_SA territory apart from VIDEO_TS.IFO, the VMG that a) obtains of integrating step and the shared LBN sum of each VTS calculate the idle LBN number between VMG and the VTS and between each VTS again;

C) the LBN number of each file that obtains according to step a) and the idle LBN number that step b) obtains calculate navigate file VIDEO_TS.IFO and the relative LBN of VTS_##_0.IFO with its subsequent file.

Wherein, include the TT_SRP data structure among the navigate file VIDEO_TS.IFO, this structure has write down the navigate file VTS_##_0.IFO of each programme contribution VTS in the DVD-Rom medium and the LBN number between the VIDEO_TS.IFO, and the TT_SRP data structure is as shown in table 1.

Table 1

	Implication	Byte number
			(1)TT_PB_TY	The playing programs type	1 byte
(2)AGL_Ns	The angle number	1 byte
			(3)PTT_Ns	The chapters and sections number	2 bytes
(4)TT_PTL_ID_FLD	The parents locking territory	2 bytes
			(5)VTSN	Video frequency program number	1 byte
(6)VTS_TTN	The video frequency program section number	1 byte
			(7)VTS_SA	The start address of video frequency program	4 bytes

When VTSN was 1, VTS_SA represented the LBN number of VTS_01_0.IFO apart from VIDEO_TS.IFO.When VTSN was 2, VTS_SA represented the LBN number of VTS_02_0.IFO apart from VIDEO_TS.IFO, and the like.

Because the present invention adopts filename that the DVD file is positioned, so on the storage medium of DVD file storage the time, still can carry out navigator fix, for mutual controls playing provides basic to the DVD file at non-DVD-Rom.

Embodiment

Below in conjunction with embodiment the present invention is described in further detail.

Do the example analysis with American movie Black hawk down (blackhawk landing).

The DVD-Video district of this film comprises a Video Manager (VMG) and 2 video-program set (VTS), shown in the 1st row of table 2, and according to the sequential storage shown in these row, the 5th row of table 2 and the 14th row are represented the idle LBN between idle LBN between VMG and first VTS and the 1st VTS and the 2nd VTS respectively to each file in the DVD-Rom medium.The file size that the 2nd row of table 2 have been added up each file of DVD-Video district, i.e. byte number.Respectively with the byte number of each file size divided by 2048, be converted to LBN number (16 system), shown in the 3rd row of table 2.Owing between each file of VMG and VTS inside, do not have idle LBN, so being counted addition, the LBN of the All Files among the VMG promptly obtains the shared LBN sum of VMG, respectively the LBN of the All Files among the VTS is counted addition and promptly obtain the shared LBN sum of each VTS, shown in the 4th row of table 2.

The LBN information table of table 2:DVD file

File name	File size (byte number)	The LBN number that file takies (file size/2048)	The LBN sum (LBN that the file that is comprised takies counts sum) that VMG/VTS takies
				?VIDEO_TS.IFO	????12288	????0×06	?0×42
?VIDEO_TS.VOB	????110592	????0×36
			?VIDEO_TS.BUP	????12288	????0×06
Idle LBN number: 0
				?VTS_01_0.IFO	????108544	????0×35	?0×228D3E
?VTS_01_0.VOB	????73578496	????0×8C57
			?VTS_01_1.VOB	????1073498112	????0×7FF89
?VTS_01_2.VOB	????1073655808	????0×7FFD6
			?VTS_01_3.VOB	????1073727488	????0×7FFF9
?VTS_01_4.VOB	????1073655808	????0×7FFD6
			?VTS_01_5.VOB	????26912153.6	????0×2014F
?VTS_01_0.BUP	????108544	????0×35
			Idle LBN number: 0
?VTS_02_0.IFO	????18432	????0×09					?0×11EE
			?VTS_02_0.VOB	????116736	????0×39
?VTS_02_1.VOB	????9246720	????0×11A3
			?VTS_02_0.BUP	????18432	????0×09

By visit VIDEO_TS.IFO file, obtain two TT_SRP.Particular content is (sexadecimal):

TT_SRP1：14?01?00?1C?00?00?01?01?00?00?00?42

It is 0 * 42 LBN apart from VIDEO_TS.IFO that TT_SRP2:14 01 00 01 00 00 02 01 00 22 8D 80 can obtain VTS_01_0.IFO with reference to the definition of TT_SRP data structure, and VTS_02_0.IFO is 0 * 228D80 LBN apart from VIDEO_TS.IFO.So LBN sum=0 * 42-0 * 42=0 that idle LBN=0 * 42-VMG takies between VMG and the VTS_01_0.IFO, expression in the 5th row of table 2; LBN sum=0 * 228D80-0 * 42-0-0 * 228D3E=0 that idle LBN-VTS1 takies between LBN sum-VMG that idle LBN=0 * 228D80-VMG takies between VTS_01_0.IFO and the VTS_02_0.IFO and the VTS_01_0.IFO, expression in the 14th row of table 2.

Form with reference to top calculates VIDEO_TS.IFO respectively, VTS_01_0.IFO, the LBN distance of VTS_01_2.IFO and its subsequent file, for example LBN of VIDEO_TS.IFO and VTS_01_0.VOB distance=0 * 06+0 * 36+0 * 06+0+0 * 35=0 * 77.And the like, can obtain the relative LBN table 3 of following navigate file and its subsequent file.

Table 3: the relative LBN table of navigate file and preface spare thereafter

Like this, utilize table 3 just to obtain corresponding between the filename of LBN information and navigate file or audio-video document.For example, when VTS_01_2.IFO provides 0 * 09 LBN value, know promptly that by table 3 VTS_01_2.IFO needs the VTS_02_0.VOB file, the rest may be inferred, whenever navigate file VIDEO_TS.IFO, VTS_01_0.IFO or VTS_02_0.IFO provide a LBN value, just can a corresponding navigate file or the filename of audio-video document.

Obtain after so corresponding result, when on the storage medium of DVD file storage at non-DVD-Rom, still can utilize navigate file to position.At first player reads VMGI information among the navigate file VIDEO_TS.IFO or the VTSI information among the navigate file VTS_##_0.IFO, then the LBN information among VMGI and the VTSI is corresponded to the navigate file that this LBN points to or the filename of audio-video document on the DVD-Rom medium, at last by pairing filename location this document.

Claims (2)

1, a kind of method with logical block number (LBN) indirect addressing DVD file comprises the steps:

1) read VMGI information among the navigate file VIDEO_TS.IFO or the VTSI information among the navigate file VTS_##_0.IFO, wherein ## represents two digits, between 01-99;

2) the LBN information among VMGI and the VTSI is corresponded to the navigate file that this LBN points to or the filename of audio-video document on the DVD-Rom medium;

3) by step 2) filename that obtains location this document.

2, a kind of method with logical block number (LBN) indirect addressing DVD file according to claim 1 is characterized in that, wherein, step 2) in LBN information obtain as follows with the corresponding of filename of navigate file or audio-video document:

A) respectively with the file size byte number of each file of DVD-Video district divided by 2048, convert the LBN number to; Then the LBN of All Files among the VMG is counted addition and obtain the shared LBN sum of VMG, respectively the LBN of the All Files among the VTS is counted addition and obtain the shared LBN sum of each VTS;

B) obtain the LBN number of VTS_##_0.IFO by VTSN in the TT SRP data structure that comprises among the navigate file VIDEO_TS.IFO and VTS_SA territory apart from VIDEO_TS.IFO, the VMG that a) obtains of integrating step and the shared LBN sum of each VTS calculate the idle LBN number between VMG and the VTS and between each VTS again;

C) the LBN number of each file that obtains according to step a) and the idle LBN number that step b) obtains calculate navigate file VIDEO_TS.IFO and the relative LBN of VTS_##_0.IFO with its subsequent file.