MP4 Box Information Example Analysis 1

Download the relevant documentation from here:
http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html One, box overall view

The following image is excerpted from: http://www.cnblogs.com/haibindev/archive/2011/10/17/2214518.html

second, box definition

Excerpt from specification: iso_iec_14496-12_2012

This article describes: Ftyp Moov
Mvhd Trak
TKHD Tref Mdia
MDHD HDLR Minf
VMHD SMHD HMHD NMHD-

Moov,mvhd,trak,tkhd,tref,mdia,mdhd,hdlr,minf,vmhd,smhd,hmhd,nmhd

1, Box aligned (8) class box (unsigned int () boxtype, optional unsigned int (8) [+] extended_type) {unsigned int (32)
    Size
    unsigned int (+) type = Boxtype;
    if (size==1) {unsigned int () largesize; } else if (size==0) {//box extends to end of file} if (boxtype== ' uuid ') {unsigned int (8) [+] Usertype
    = Extended_type; }} aligned (8) class Fullbox (unsigned int (boxtype), unsigned int (8) v, bit (+) f) extends Box (boxtype) {unsigned
    Int (8) version = V;
Bit () flags = f;
    } 2, Ftyp box aligned (8) Class Filetypebox extends Box (' Ftyp ') {unsigned int (+) Major_brand;
    unsigned int (+) minor_version;
unsigned int (+) compatible_brands[];
}/* Each brand was a printable four-character code, registered with ISO, that identifies a precise specification. Major_brand–is a brand identifier Minor_version–is an informative integer for the minor version of the major brand COM Patible_brands–is a list, to the end of the box, of brands */3, Moov box//-------------movie Structure--------------------////----movie box--////definition box Typ  E: ' Moov ' container:file mandatory:yes quantity:exactly one//syntax aligned (8) class MovieBox extends Box (' Moov ') {} 3.1 MVHD box//---Movie Header box---////definition box Type: ' Mvhd ' container:movie box (' Moov ') Mandatory:yes Quantity:exac tly one//syntax aligned (8) class Movieheaderbox extends Fullbox (' mvhd ', version, 0) {if (version==1) {Unsi
        gned int (creation_time);
        unsigned int (modification_time);
        unsigned int (+) timescale;
    unsigned int (duration);
        } else {//version==0 unsigned int (+) Creation_time;
        unsigned int (+) Modification_time;
        unsigned int (+) timescale;
    unsigned int (+) duration; } template int (+) rate = 0x00010000;
    typically 1.0 template int (volume) = 0x0100;
    Typically, full volume const bit (reserved) = 0; const unsigned INT (32) [2] reserved = 0;
    template int (+) [9] matrix = {0x00010000,0,0,0,0x00010000,0,0,0,0x40000000};
    Unity Matrix bit (+) [6] pre_defined = 0;
unsigned int (+) next_track_id; } 3.2 Track box//----Track box--//8.3.1.1 track box//definition box Type: ' Trak ' container:movie box (' Moov ') mandator Y:yes Quantity:one or more 8.3.1.2//syntax aligned (8) Class Trackbox extends Box (' Trak ') {} 3.2.1 Track header box//-  ----8.3.2.1 track Header box--////definition box Type: ' Tkhd ' container:track box (' Trak ') Mandatory:yes quantity:exactly
        One//8.3.2.2 Syntax aligned (8) class Trackheaderbox extends Fullbox (' TKHD ', version, flags) {if (version==1) {
        unsigned int (creation_time);
        unsigned int (modification_time);
        unsigned int (+) track_id;
        const unsigned int (+) reserved = 0;
    unsigned int (duration);
        } else {//version==0 unsigned int (+) Creation_time;
        unsigned int (+) Modification_time; Unsigned Int (+) track_id;
        const unsigned int (+) reserved = 0;
    unsigned int (+) duration;
    } const unsigned int (+) [2] reserved = 0;
    template int (+) layer = 0;
    template int (alternate_group) = 0;
    template int (volume) = {if Track_is_audio 0x0100 else 0};
    const unsigned int (reserved) = 0;
    template int (+) [9] matrix= {0x00010000,0,0,0,0x00010000,0,0,0,0x40000000};
    Unity Matrix unsigned int (+) width;
unsigned int (+) height; }//--------8.3.3 track Reference box-----////8.3.3.1 Definition box Type: ' Tref ' container:track Box (' Trak ') Mandatory: No Quantity:zero or one//8.3.3.2 Syntax aligned (8) class Trackreferencebox extends Box (' Tref ') {} aligned (8) class Trac


Kreferencetypebox (unsigned int (+) reference_type) extends Box (reference_type) {unsigned int (+) track_ids[];} ---------------------8.4 Track Media Structure-------------////--8.4.1 media Box--////8.4.1.1 Definition Box Type: ' m Dia ' Container:tracK Box (' Trak ') mandatory:yes quantity:exactly one//8.4.1.2 Syntax aligned (8) class Mediabox extends Box (' Mdia ') {}//- -8.4.2 Media Header box--////8.4.2.1 Definition box Type: ' Mdhd ' container:media box (' Mdia ') Mandatory:yes Quantity:exac
        tly one//8.4.2.2 Syntax aligned (8) class Mediaheaderbox extends Fullbox (' MDHD ', version, 0) {if (version==1) {
        unsigned int (creation_time);
        unsigned int (modification_time);
        unsigned int (+) timescale;
    unsigned int (duration);
        } else {//version==0 unsigned int (+) Creation_time;
        unsigned int (+) Modification_time;
        unsigned int (+) timescale;
    unsigned int (+) duration;
    } bit (1) pad = 0;   unsigned int (5) [3] language;
iso-639-2/t Language Code unsigned int (+) pre_defined = 0; }//---------------8.4.3 Handler Reference box-------////8.4.3.1 Definition box Type: ' Hdlr ' container:media box (' Mdia ') or meta Box (' meta ') Mandatory:yes Quantity:exactly one//8.4.3.2 Syntax aligned (8) class Handlerbox extends Fullbox (' hdlr ', Version = 0, 0) {unsigned int (
    pre_defined = 0;
    unsigned int (+) Handler_type;
    const unsigned int (+) [3] reserved = 0;
String name; }//8.4.3.3 Semantics/* version is an integer that specifies the version of this box handler_type when present in a Medi A box, is an integer containing one of the following values, or a value from a derived specification: ' vide ' Video track '  Soun ' Audio track ' hint ' hint track ' meta ' Timed Metadata track ' AUXV ' auxiliary Video track handler_type when present in A meta box, contains an appropriate value to indicate the format of the Meta box contents.
The value ' null ' can be used in the primary meta box to indicate that it's merely being used to hold resources. Name is a null-terminated string of UTF-8 characters which gives a human-readable name for the track type (for debugging a
ND inspection purposes). *///----8.4.4 Media information Box----////8.4.4.1 Definition box Type: ' Minf ' container:media box (' Mdia ') mandatory:yes quantity:exactly one//8.4.4.2 Syntax Aligned (8) class Mediainformationbox extends Box (' Minf ') {}//-----8.4.5 Media Information Header Boxes---////8.4.5. 1 Definition Box Types: ' Vmhd ', ' smhd ', ' hmhd ', ' NMHD ' Container:media information Box (' Minf ') Mandatory:yes Quantity:exac tly one specific media header shall be present///the following are different specific types://8.4.5.2 Video Media header Box aligned (8) class Videomedia
    Headerbox extends Fullbox (' VMHD ', Version = 0, 1) {Template unsigned int (+) Graphicsmode = 0;
Copy, see below template unsigned int (+) [3] Opcolor = {0, 0, 0}; }//8.4.5.3 Sound Media Header Box aligned (8) class Soundmediaheaderbox extends Fullbox (' SMHD ', Version = 0, 0) {tem
    plate int (balance) = 0;
const unsigned int (reserved) = 0; }//8.4.5.4 Hint Media Header Box aligned (8) class Hintmediaheaderbox extends Fullbox (' HMHD ', Version = 0, 0) {Unsig Ned Int (maxpdusize);
    unsigned int (avgpdusize);
    unsigned int (+) maxbitrate;
    unsigned int (+) avgbitrate;
unsigned int (+) reserved = 0;  }//8.4.5.5 Null Media Header Box Streams other than visual and audio (e.g., timed metadata Streams) could use a null media

Header Box, as defined here.
 Aligned (8) class Nullmediaheaderbox extends Fullbox (' NMHD ', Version = 0, flags) {}