gtsocial-umbx

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box.go (4482B)

      1 package mp4
      2 
      3 import (
      4 	"errors"
      5 	"io"
      6 	"math"
      7 
      8 	"github.com/abema/go-mp4/bitio"
      9 )
     10 
     11 const LengthUnlimited = math.MaxUint32
     12 
     13 type ICustomFieldObject interface {
     14 	// GetFieldSize returns size of dynamic field
     15 	GetFieldSize(name string, ctx Context) uint
     16 
     17 	// GetFieldLength returns length of dynamic field
     18 	GetFieldLength(name string, ctx Context) uint
     19 
     20 	// IsOptFieldEnabled check whether if the optional field is enabled
     21 	IsOptFieldEnabled(name string, ctx Context) bool
     22 
     23 	// StringifyField returns field value as string
     24 	StringifyField(name string, indent string, depth int, ctx Context) (string, bool)
     25 
     26 	IsPString(name string, bytes []byte, remainingSize uint64, ctx Context) bool
     27 
     28 	BeforeUnmarshal(r io.ReadSeeker, size uint64, ctx Context) (n uint64, override bool, err error)
     29 
     30 	OnReadField(name string, r bitio.ReadSeeker, leftBits uint64, ctx Context) (rbits uint64, override bool, err error)
     31 
     32 	OnWriteField(name string, w bitio.Writer, ctx Context) (wbits uint64, override bool, err error)
     33 }
     34 
     35 type BaseCustomFieldObject struct {
     36 }
     37 
     38 // GetFieldSize returns size of dynamic field
     39 func (box *BaseCustomFieldObject) GetFieldSize(string, Context) uint {
     40 	panic(errors.New("GetFieldSize not implemented"))
     41 }
     42 
     43 // GetFieldLength returns length of dynamic field
     44 func (box *BaseCustomFieldObject) GetFieldLength(string, Context) uint {
     45 	panic(errors.New("GetFieldLength not implemented"))
     46 }
     47 
     48 // IsOptFieldEnabled check whether if the optional field is enabled
     49 func (box *BaseCustomFieldObject) IsOptFieldEnabled(string, Context) bool {
     50 	return false
     51 }
     52 
     53 // StringifyField returns field value as string
     54 func (box *BaseCustomFieldObject) StringifyField(string, string, int, Context) (string, bool) {
     55 	return "", false
     56 }
     57 
     58 func (*BaseCustomFieldObject) IsPString(name string, bytes []byte, remainingSize uint64, ctx Context) bool {
     59 	return true
     60 }
     61 
     62 func (*BaseCustomFieldObject) BeforeUnmarshal(io.ReadSeeker, uint64, Context) (uint64, bool, error) {
     63 	return 0, false, nil
     64 }
     65 
     66 func (*BaseCustomFieldObject) OnReadField(string, bitio.ReadSeeker, uint64, Context) (uint64, bool, error) {
     67 	return 0, false, nil
     68 }
     69 
     70 func (*BaseCustomFieldObject) OnWriteField(string, bitio.Writer, Context) (uint64, bool, error) {
     71 	return 0, false, nil
     72 }
     73 
     74 // IImmutableBox is common interface of box
     75 type IImmutableBox interface {
     76 	ICustomFieldObject
     77 
     78 	// GetVersion returns the box version
     79 	GetVersion() uint8
     80 
     81 	// GetFlags returns the flags
     82 	GetFlags() uint32
     83 
     84 	// CheckFlag checks the flag status
     85 	CheckFlag(uint32) bool
     86 
     87 	// GetType returns the BoxType
     88 	GetType() BoxType
     89 }
     90 
     91 // IBox is common interface of box
     92 type IBox interface {
     93 	IImmutableBox
     94 
     95 	// SetVersion sets the box version
     96 	SetVersion(uint8)
     97 
     98 	// SetFlags sets the flags
     99 	SetFlags(uint32)
    100 
    101 	// AddFlag adds the flag
    102 	AddFlag(uint32)
    103 
    104 	// RemoveFlag removes the flag
    105 	RemoveFlag(uint32)
    106 }
    107 
    108 type Box struct {
    109 	BaseCustomFieldObject
    110 }
    111 
    112 // GetVersion returns the box version
    113 func (box *Box) GetVersion() uint8 {
    114 	return 0
    115 }
    116 
    117 // SetVersion sets the box version
    118 func (box *Box) SetVersion(uint8) {
    119 }
    120 
    121 // GetFlags returns the flags
    122 func (box *Box) GetFlags() uint32 {
    123 	return 0x000000
    124 }
    125 
    126 // CheckFlag checks the flag status
    127 func (box *Box) CheckFlag(flag uint32) bool {
    128 	return true
    129 }
    130 
    131 // SetFlags sets the flags
    132 func (box *Box) SetFlags(uint32) {
    133 }
    134 
    135 // AddFlag adds the flag
    136 func (box *Box) AddFlag(flag uint32) {
    137 }
    138 
    139 // RemoveFlag removes the flag
    140 func (box *Box) RemoveFlag(flag uint32) {
    141 }
    142 
    143 // FullBox is ISOBMFF FullBox
    144 type FullBox struct {
    145 	BaseCustomFieldObject
    146 	Version uint8   `mp4:"0,size=8"`
    147 	Flags   [3]byte `mp4:"1,size=8"`
    148 }
    149 
    150 // GetVersion returns the box version
    151 func (box *FullBox) GetVersion() uint8 {
    152 	return box.Version
    153 }
    154 
    155 // SetVersion sets the box version
    156 func (box *FullBox) SetVersion(version uint8) {
    157 	box.Version = version
    158 }
    159 
    160 // GetFlags returns the flags
    161 func (box *FullBox) GetFlags() uint32 {
    162 	flag := uint32(box.Flags[0]) << 16
    163 	flag ^= uint32(box.Flags[1]) << 8
    164 	flag ^= uint32(box.Flags[2])
    165 	return flag
    166 }
    167 
    168 // CheckFlag checks the flag status
    169 func (box *FullBox) CheckFlag(flag uint32) bool {
    170 	return box.GetFlags()&flag != 0
    171 }
    172 
    173 // SetFlags sets the flags
    174 func (box *FullBox) SetFlags(flags uint32) {
    175 	box.Flags[0] = byte(flags >> 16)
    176 	box.Flags[1] = byte(flags >> 8)
    177 	box.Flags[2] = byte(flags)
    178 }
    179 
    180 // AddFlag adds the flag
    181 func (box *FullBox) AddFlag(flag uint32) {
    182 	box.SetFlags(box.GetFlags() | flag)
    183 }
    184 
    185 // RemoveFlag removes the flag
    186 func (box *FullBox) RemoveFlag(flag uint32) {
    187 	box.SetFlags(box.GetFlags() & (^flag))
    188 }