DVD-Video 解谜 - IFO文件 - IFO 头文件解析

Video Manager and Video Title Set IFO file headers

Offset	size	VMG IFO Contents	File Structures	VTS IFO Contents
0000	12	DVDVIDEO-VMG	VMG Files 00000000 Video_ts.ifo (001C)-> (00C0)-> Video_ts.vob     Video_ts.bup (000C)-> VTS Files Vts_xx_0.ifo 00000000 <-(001C) Vts_xx_0.vob <-(00C0)   Vts_xx_1.vob : Vts_xx_9.vob <-(00C4)   Vts_xx_0.bup   <-(000C)	DVDVIDEO-VTS
000C	4	last sector of VMG set (last sector of BUP)		last sector of title set (last sector of BUP)
001C	4	last sector of IFO		last sector of IFO
0020	2	version number		version number
0022	4	VMG category byte1=prohibited region mask		VTS category   0=unspecified, 1=Karaoke
0026	2	number of volumes
0028	2	volume number
002A	1	side ID
003E	2	number of title sets
0040	32	Provider ID
0060	8	VMG POS
0080	4	end byte address of VMGI_MAT		end byte address of VTS_MAT
0084	4	start address of FP_PGC (First Play program chain)
00C0	4	start sector of Menu VOB		start sector of Menu Vob
00C4	4	sector pointer to TT_SRPT (table of titles)		start sector of Title Vob
00C8	4	sector pointer to VMGM_PGCI_UT (Menu Program Chain table)		sector pointer to VTS_PTT_SRPT (table of Titles and Chapters)
00CC	4	sector pointer to VMG_PTL_MAIT (Parental Management masks)		sector pointer to VTS_PGCI (Title Program Chain table)
00D0	4	sector pointer to VMG_VTS_ATRT (copies of VTS audio/sub-picture attributes)		sector pointer to VTSM_PGCI_UT (Menu Program Chain table)
00D4	4	sector pointer to VMG_TXTDT_MG (text data)		sector pointer to VTS_TMAPTI (time map)
00D8	4	sector pointer to VMGM_C_ADT (menu cell address table)		sector pointer to VTSM_C_ADT (menu cell address table)
00DC	4	sector pointer to VMGM_VOBU_ADMAP (menu VOBU address map)		sector pointer to VTSM_VOBU_ADMAP (menu VOBU address map)
00E0	4			sector pointer to VTS_C_ADT (title set cell address table)
00E4	4			sector pointer to VTS_VOBU_ADMAP (title set VOBU address map)
0100	2	video attributes of VMGM_VOBS		video attributes of VTSM_VOBS
0102	2	number of audio streams in VMGM_VOBS (0 or 1)		number of audio streams in VTSM_VOBS (0 or 1)
0104	8	audio attributes of VMGM_VOBS		audio attributes of VTSM_VOBS
010C	56	reserved		reserved
0144	16
0154	2	number of subpicture streams in VMGM_VOBS (0 or 1)		number of subpicture streams in VTSM_VOBS (0 or 1)
0156	6	subpicture attributes of VMGM_VOBS		subpicture attributes of VTSM_VOBS
015C	164	reserved		reserved
0200	2	reserved		video attributes of VTS_VOBS
0202	2	reserved		number of audio streams in VTS_VOBS
0204	8*8	reserved		audio attributes of VTS_VOBS
0244	16	reserved
0254	2	reserved		number of subpicture streams in VTS_VOBS
0256	32*6	reserved		subpicture attributes of VTS_VOBS
0316	2	reserved
0318	8*24	reserved		multichannel extension
03D8	40	reserved		reserved

Version Number

byte	7	6	5	4	3	2	1	0
0	reserved, should be 0
1	Major version number				Minor version number

Video Attributes

byte	7	6	5	4	3	2	1	0
0	Coding mode 0 = Mpeg-1, 1 = Mpeg-2		Standard 0 = NTSC, 1 = PAL		Aspect 0 = 4:3, 1 = not specified, 2 = reserved, 3 = 16:9 1 & 2 should not be used		Automatic Pan/Scan 1 = disallowed	Automatic Letterbox 1 = disallowed
1	CC for line 21 field 1 in GOP (NTSC only)	CC for line 21 field 2 in GOP (NTSC only)	Bit Rate 0 = VBR, 1 = CBR	Resolution NTSC (PAL) 0 = 720x480 (720x576), 1 = 704x480 (704x576), 2 = 352x480 (352x576), 3 = 352x240 (352x288)		Letterboxed 1=top and bottom cropped	reserved	Film 0=camera, 1=film (PAL only)

Title Audio Attributes

byte	7	6	5	4	3	2	1	0
0	Coding mode 0 AC3   1 ???   2 Mpeg-1   3 Mpeg-2ext 4 LPCM   5 ???   6 DTS   7 ???			Multichannel extension present	Language type 0 = unspecified 1 = per bytes 2&3		Application mode 0 = unspecified 1 = karaoke 2 = surround
1	Quantization/DRC 0 = 16bps, 1 = 20bps, 2 = 24bps, 3 = DRC (dynamic range control)		Sample rate 0 = 48Ksps 1 = 96Ksps		reserved	channels-1
2	1 stcharacter of language code
3	2 ndcharacter of language code
4	reserved for language code extension
5	code extension, 0 = unspecified, 1 = normal, 2 = for visually impaired, 3 = director's comments, 4 = alternate director's comments
6	reserved
7	Application information karaoke mode
	0	Channel assignments 0 = 1+1 (not valid), 1 = 1/0 (not valid), 2 = 2/0 L,R , 3 = 3/0 L,M,R , 4 = 2/1 L,R,V1 , 5 = 3/1 L,M,R,V1 , 6 = 2/2 L,R,V1,V2 , 7 = 3/2 L,M,R,V1,V2			Karaoke version		MC intro present	0=solo, 1=duet
	surround mode
	reserved				1 = suitable for Dolby surround decoding	reserved

Menu Audio Attributes

byte	7	6	5	4	3	2	1	0
0	Coding mode 0 AC3   1 ???   2 Mpeg-1   3 Mpeg-2ext 4 LPCM   5 ???   6 DTS   7 ???			reserved
1	Quantization/DRC 0 = 16bps, 1 = 20bps, 2 = 24bps, 3 = DRC (dynamic range control)		Sample rate 0 = 48Ksps 1 = 96Ksps		reserved	channels-1
2	reserved
3	reserved
4	reserved
5	reserved
6	reserved
7	reserved

MultiChannel Extension - Karaoke mode

byte (hex)	7	6	5	4	3	2	1	0
00	reserved							ACH0 Guide Melody exists
01	reserved							ACH1 Guide Melody exists
02	reserved				ACH2 Guide Vocal 1 exists	ACH2 Guide Vocal 2 exists	ACH2 Guide Melody 1 exists	ACH2 Guide Melody 2 exists
03	reserved				ACH3 Guide Vocal 1 exists	ACH3 Guide Vocal 2 exists	ACH3 Guide Melody A exists	ACH3 Sound Effect A exists
04	reserved				ACH4 Guide Vocal 1 exists	ACH4 Guide Vocal 2 exists	ACH4 Guide Melody B exists	ACH4 Sound Effect B exists
05-17

Title Subpicture Attributes

byte	7	6	5	4	3	2	1	0
0	Coding mode 0 = 2-bit rle			reserved			Language type 0 = unspecified 1 = per bytes 2&3
1	reserved
2	1 stcharacter of language code
3	2 ndcharacter of language code
4	reserved for language code extension
5	code extension - see SPRM #19 for the values

Menu Subpicture Attributes

byte	7	6	5	4	3	2	1	0
0	Coding mode 0 = 2-bit rle			reserved
1	reserved
2	reserved
3	reserved
4	reserved
5	reserved

VMGM_C_ADT
VTSM_C_ADT
VTS_C_ADT

This table contains pointers to all the cells in the menu or title set.

offset	0	1	2	3	4	5	6	7
0	number of VOBs		reserved		end address (last byte of last entry)
8...	12-byte entries

each entry

Offset	size	Contents
0	2	VOBidn
2	1	CELLidn
3	1
4	4	starting sector within VOB
8	4	ending sector within VOB

VMGM_VOBU_ADMAP
VTSM_VOBU_ADMAP
VTS_VOBU_ADMAP

This table contains pointers to all the VOBUs in the menu or title set.

offset	0	1	2	3
0	end address (last byte of last entry)
4	starting sector within VOB of first VOBU
8 ...	possible additional entries