Bitstream Interface Reference

import"core.idl";

Public Member Functions
	Bitstream ()
	Bitstream (ArrayBuffer buffer, optional boolean write_mode=false)
	Bitstream (File file, optional boolean write_mode=false)
unsigned long	get_u8 ()
unsigned long	get_s8 ()
unsigned long	get_u16 ()
unsigned long	get_u16_le ()
unsigned long	get_s16 ()
unsigned long	get_u24 ()
unsigned long	get_u32 ()
unsigned long	get_u32_le ()
unsigned long	get_s32 ()
unsigned long	get_u64 ()
unsigned long	get_u64_le ()
unsigned long	get_s64 ()
unsigned long	get_bits (unsigned long nb_bits)
double	get_float ()
double	get_double ()
unsigned long	get_data (ArrayBuffer buffer, optional unsigned long nb_bytes=0)
DOMString	get_string ()
DOMString	get_4cc ()
void	put_u8 (unsigned long value)
void	put_s8 (signed long value)
void	put_u16 (unsigned long value)
void	put_u16_le (unsigned long value)
void	put_s16 (signed long value)
void	put_u24 (unsigned long value)
void	put_u32 (unsigned long value)
void	put_u32_le (unsigned long value)
void	put_s32 (signed long value)
void	put_u64 (unsigned long long value)
void	put_u64_le (unsigned long long value)
void	put_s64 (signed long long value)
void	put_bits (unsigned long long value, unsigned long nb_bits)
void	put_float (double value)
void	put_double (double value)
unsigned long	put_data (ArrayBuffer buffer, optional unsigned long nb_bytes=0)
void	put_4cc (DOMString fcc)
void	put_string (DOMString str)
void	insert_data (ArrayBuffer buffer, optional unsigned long nb_bytes=0, optional unsigned long offset=0)
boolean	is_align ()
void	align ()
void	truncate ()
ArrayBuffer	get_content ()
void	transfer (Bitstream *src_bs, optional boolean keep_src=false)
unsigned long	peek (unsigned long nb_bits, optional unsigned long byte_offset=0)
void	skip (unsigned long nb_bytes)
void	flush ()
void	epb_mode (boolean enable)

Data Fields
attribute unsigned long long	pos
attribute readonly unsigned long long	available
attribute readonly unsigned long long	size
attribute readonly unsigned long	bit_offset
attribute readonly unsigned long	bit_position
attribute readonly unsigned long	bits_available
attribute readonly unsigned long long	refreshed_size
attribute readonly boolean	overflow

Detailed Description

Bitstream object

Constructor & Destructor Documentation

Bitstream() [1/3]

Bitstream::Bitstream

(

)

constructor for a dynamic allocated write bitstream

Bitstream() [2/3]

Bitstream::Bitstream	(	ArrayBuffer	buffer,
		optional boolean	write_mode = false
	)

constructor for a static allocated bitstream

Parameters

buffer	the array buffer to use for bitstream operations
write_mode	if set to true, the bitstream is created in write mode, otherwise in read mode

Bitstream() [3/3]

Bitstream::Bitstream	(	File	file,
		optional boolean	write_mode = false
	)

constructor for a bitstream wrapping a file - see gf_bs_from_file

Parameters

file	the File object to use for bitstream operations
write_mode	if set to true, the bitstream is created in write mode, otherwise in read mode. This mode shall be compatible with the file open mode

Member Function Documentation

get_u8()

unsigned long Bitstream::get_u8

(

)

get 8-bits unsigned integer, byte-aligned

Returns

value read

get_s8()

unsigned long Bitstream::get_s8

(

)

get 8-bits signed integer, byte-aligned

Returns

value read

get_u16()

unsigned long Bitstream::get_u16

(

)

get 16-bits unsigned integer, byte-aligned, big-endian

Returns

value read

get_u16_le()

unsigned long Bitstream::get_u16_le

(

)

get 16-bits unsigned integer, byte-aligned, little-endian

Returns

value read

get_s16()

unsigned long Bitstream::get_s16

(

)

get 16-bits signed integer, byte-aligned, big-endian

Returns

value read

get_u24()

unsigned long Bitstream::get_u24

(

)

get 24-bits unsigned integer, byte-aligned, big-endian

Returns

value read

get_u32()

unsigned long Bitstream::get_u32

(

)

get 32-bits unsigned integer, byte-aligned, big-endian

Returns

value read

get_u32_le()

unsigned long Bitstream::get_u32_le

(

)

get 32-bits unsigned integer, byte-aligned, little-endian

Returns

value read

get_s32()

unsigned long Bitstream::get_s32

(

)

get 32-bits signed integer, byte-aligned, big-endian

Returns

value read

get_u64()

unsigned long Bitstream::get_u64

(

)

get 64-bits unsigned integer, byte-aligned, big-endian

Returns

value read

get_u64_le()

unsigned long Bitstream::get_u64_le

(

)

get 64-bits unsigned integer, byte-aligned, little-endian

Returns

value read

get_s64()

unsigned long Bitstream::get_s64

(

)

get 64-bits signed integer, byte-aligned, big-endian

Returns

value read

get_bits()

unsigned long Bitstream::get_bits

(

unsigned long

nb_bits

)

get n-bits unsigned integer, big-endian

Parameters

nb_bits

number of bits to read

Returns

value read

get_float()

double Bitstream::get_float

(

)

get float 32 bits value

Returns

value read

get_double()

double Bitstream::get_double

(

)

get float 64 bits value

Returns

value read

get_data()

unsigned long Bitstream::get_data	(	ArrayBuffer	buffer,
		optional unsigned long	nb_bytes = 0
	)

reads bytes in an array buffer

Parameters

buffer	target read buffer
nb_bytes	number of bytes to read - if 0, uses array buffer size. If more than array buffer size, truncated to array buffer size

Returns

number of bytes read

get_string()

DOMString Bitstream::get_string

(

)

get utf8 string

Returns

value read

get_4cc()

DOMString Bitstream::get_4cc

(

)

reads 4CC

Returns

four-character code read

put_u8()

void Bitstream::put_u8

(

unsigned long

value

)

write 8-bit unsigned value

Parameters

value

value to write

put_s8()

void Bitstream::put_s8

(

signed long

value

)

write 8-bit signed value

Parameters

value

value to write

put_u16()

void Bitstream::put_u16

(

unsigned long

value

)

write 16-bit unsigned value, big-endian

Parameters

value

value to write

put_u16_le()

void Bitstream::put_u16_le

(

unsigned long

value

)

write 8-bit unsigned value, little-endian

Parameters

value

value to write

put_s16()

void Bitstream::put_s16

(

signed long

value

)

write 16-bit signed value, big-endian

Parameters

value

value to write

put_u24()

void Bitstream::put_u24

(

unsigned long

value

)

write 24-bit unsigned value

Parameters

value

value to write

put_u32()

void Bitstream::put_u32

(

unsigned long

value

)

write 32-bit unsigned value, big-endian

Parameters

value

value to write

put_u32_le()

void Bitstream::put_u32_le

(

unsigned long

value

)

write 32-bit unsigned value, little-endian

Parameters

value

value to write

put_s32()

void Bitstream::put_s32

(

signed long

value

)

write 32-bit signed value, big-endian

Parameters

value

value to write

put_u64()

void Bitstream::put_u64

(

unsigned long long

value

)

write 64-bit unsigned value, big-endian

Parameters

value

value to write

put_u64_le()

void Bitstream::put_u64_le

(

unsigned long long

value

)

write 64-bit unsigned value, little-endian

Parameters

value

value to write

put_s64()

void Bitstream::put_s64

(

signed long long

value

)

write 64-bit signed value, big-endian

Parameters

value

value to write

put_bits()

void Bitstream::put_bits	(	unsigned long long	value,
		unsigned long	nb_bits
	)

write n-bit unsigned value

Parameters

value	value to write
nb_bits	number of bits to use when writing

put_float()

void Bitstream::put_float

(

double

value

)

write 32-bit float value

Parameters

value

value to write

put_double()

void Bitstream::put_double

(

double

value

)

write 64-bit float value

Parameters

value

value to write

put_data()

unsigned long Bitstream::put_data	(	ArrayBuffer	buffer,
		optional unsigned long	nb_bytes = 0
	)

write data

Parameters

buffer	source of data to write
nb_bytes	number of bytes to write - if 0, uses array buffer size. If more than array buffer size, truncated to array buffer size

Returns

number of bytes written

put_4cc()

void Bitstream::put_4cc

(

DOMString

fcc

)

write 4CC

Parameters

fcc	four-character code to write

put_string()

void Bitstream::put_string

(

DOMString

str

)

write UTF-8 string

Parameters

str	string to write

insert_data()

void Bitstream::insert_data	(	ArrayBuffer	buffer,
		optional unsigned long	nb_bytes = 0,
		optional unsigned long	offset = 0
	)

write 64-bit float value

Parameters

buffer	buffer to write
nb_bytes	number of bytes to write - if 0, uses array buffer size. If more than array buffer size, truncated to array buffer size
offset	byte offset at which data must be inserted

is_align()

boolean Bitstream::is_align

(

)

check if bitsream is byte-aligned - see gf_bs_is_align

Returns

true if aligned

align()

void Bitstream::align

(

)

set bitsream byte-aligned - see gf_bs_align

truncate()

void Bitstream::truncate

(

)

truncate bitsream - see gf_bs_truncate

get_content()

ArrayBuffer Bitstream::get_content

(

)

get content of the bitstream - see gf_bs_get_content

Returns

ArrayBuffer containing the bitstream content

transfer()

void Bitstream::transfer	(	Bitstream *	src_bs,
		optional boolean	keep_src = false
	)

transfer bitstream into another - see gf_bs_transfer

Parameters

src_bs	source bitstream for bytes to transfer
keep_src	if true, the source bitstream will not be reset

peek()

unsigned long Bitstream::peek	(	unsigned long	nb_bits,
		optional unsigned long	byte_offset = 0
	)

peek bits without changing bitstream state - see gf_bs_peek_bits

Parameters

nb_bits	the number of bits to peek
byte_offset	the position of the first byte after the current position to start peek

Returns

value peeked

skip()

void Bitstream::skip

(

unsigned long

nb_bytes

)

skips given amount of bytes

Parameters

nb_bytes

number of bytes to skip

flush()

void Bitstream::flush

(

)

flush underlying file object if any

epb_mode()

void Bitstream::epb_mode

(

boolean

enable

)

enable emulation preventio byte removal - see gf_bs_enable_emulation_byte_removal

Parameters

enable

if true, EPB is removed in read operations

Field Documentation

pos

attribute unsigned long long Bitstream::pos

position of bitstream - see gf_bs_get_position and gf_bs_seek

available

attribute readonly unsigned long long Bitstream::available

check if bytes are available for read/write - see gf_bs_available

size

attribute readonly unsigned long long Bitstream::size

size of bitstream - see gf_bs_get_size

bit_offset

attribute readonly unsigned long Bitstream::bit_offset

bit offset in bitstream - see gf_bs_get_bit_offset

bit_position

attribute readonly unsigned long Bitstream::bit_position

bit position in bitstream - see gf_bs_get_bit_position

bits_available

attribute readonly unsigned long Bitstream::bits_available

bit available till end of byte - see gf_bs_bits_available

refreshed_size

attribute readonly unsigned long long Bitstream::refreshed_size

gets refreshed size of bitstream - see gf_bs_get_refreshed_size

overflow

attribute readonly boolean Bitstream::overflow

checks if bitstream read has overflown - see gf_bs_is_overflow