Collaboration diagram for Bitstream IO:

Typedefs
typedef struct __tag_bitstream	GF_BitStream

Enumerations
enum	{ GF_BITSTREAM_READ = 0 , GF_BITSTREAM_WRITE , GF_BITSTREAM_WRITE_DYN }

Functions
GF_BitStream *	gf_bs_new (const u8 *buffer, u64 size, u32 mode)
	bitstream constructor More...

GF_Err	gf_bs_reassign_buffer (GF_BitStream bs, const u8 buffer, u64 size)
	bitstream reassignment More...

GF_BitStream *	gf_bs_from_file (FILE *f, u32 mode)
	bitstream constructor from file handle More...

void	gf_bs_del (GF_BitStream *bs)
	bitstream destructor from file handle More...

GF_BitStream *	gf_bs_new_cbk (GF_Err(on_block_out)(void cbk, u8 data, u32 block_size), void usr_data, u32 block_size)
	bitstream constructor from callback output More...

GF_BitStream *	gf_bs_new_cbk_buffer (GF_Err(on_block_out)(void cbk, u8 data, u32 block_size), void usr_data, u8 *buffer, u32 buffer_size)
	bitstream constructor from callback output and preallocated buffer More...

void	gf_bs_prevent_dispatch (GF_BitStream *bs, Bool prevent_dispatch)
	prevents block dispatch Prevents byte dispatching in callback mode. This is used when seek operations are used. More...

u32	gf_bs_read_int (GF_BitStream *bs, u32 nBits)
	integer reading More...

u64	gf_bs_read_long_int (GF_BitStream *bs, u32 nBits)
	large integer reading More...

Float	gf_bs_read_float (GF_BitStream *bs)
	float reading More...

Double	gf_bs_read_double (GF_BitStream *bs)
	double reading More...

u32	gf_bs_read_data (GF_BitStream bs, u8 data, u32 nbBytes)
	data reading More...

u32	gf_bs_read_u8 (GF_BitStream *bs)
	align char reading More...

u32	gf_bs_read_u16 (GF_BitStream *bs)
	align short reading More...

u32	gf_bs_read_u24 (GF_BitStream *bs)
	align 24-bit integer reading More...

u32	gf_bs_read_u32 (GF_BitStream *bs)
	align integer reading More...

u64	gf_bs_read_u64 (GF_BitStream *bs)
	align large integer reading More...

u64	gf_bs_read_u64_le (GF_BitStream *bs)
	little endian integer reading More...

u32	gf_bs_read_u32_le (GF_BitStream *bs)
	little endian integer reading More...

u16	gf_bs_read_u16_le (GF_BitStream *bs)
	little endian integer reading More...

u32	gf_bs_read_vluimsbf5 (GF_BitStream *bs)
	variable length integer reading More...

u32	gf_bs_get_bit_offset (GF_BitStream *bs)
	bit position More...

u32	gf_bs_get_bit_position (GF_BitStream *bs)
	current bit position More...

void	gf_bs_write_int (GF_BitStream *bs, s32 value, s32 nBits)
	integer writing More...

void	gf_bs_write_long_int (GF_BitStream *bs, s64 value, s32 nBits)
	large integer writing More...

void	gf_bs_write_float (GF_BitStream *bs, Float value)
	float writing More...

void	gf_bs_write_double (GF_BitStream *bs, Double value)
	double writing More...

u32	gf_bs_write_data (GF_BitStream bs, const u8 data, u32 nbBytes)
	data writing More...

void	gf_bs_write_u8 (GF_BitStream *bs, u32 value)
	align char writing More...

void	gf_bs_write_u16 (GF_BitStream *bs, u32 value)
	align short writing More...

void	gf_bs_write_u24 (GF_BitStream *bs, u32 value)
	align 24-bits integer writing More...

void	gf_bs_write_u32 (GF_BitStream *bs, u32 value)
	align integer writing More...

void	gf_bs_write_u64 (GF_BitStream *bs, u64 value)
	align large integer writing More...

void	gf_bs_write_u32_le (GF_BitStream *bs, u32 value)
	little endian integer writing More...

void	gf_bs_write_u64_le (GF_BitStream *bs, u64 value)
	little endian large integer writing More...

void	gf_bs_write_u16_le (GF_BitStream *bs, u32 value)
	little endian short writing More...

u32	gf_bs_write_byte (GF_BitStream *bs, u8 byte, u32 count)
	write byte multiple times More...

void	gf_bs_set_eos_callback (GF_BitStream bs, void(EndOfStream)(void par), void par)
	end of bitstream management More...

Bool	gf_bs_is_align (GF_BitStream *bs)
	bitstream alignment checking More...

u8	gf_bs_align (GF_BitStream *bs)
	bitstream alignment More...

u64	gf_bs_available (GF_BitStream *bs)
	capacity query More...

void	gf_bs_get_content (GF_BitStream bs, u8 output, u32 outSize)
	buffer fetching More...

void	gf_bs_get_content_no_truncate (GF_BitStream bs, u8 output, u32 outSize, u32 *allocSize)
	buffer fetching More...

void	gf_bs_skip_bytes (GF_BitStream *bs, u64 nbBytes)
	byte skipping More...

GF_Err	gf_bs_seek (GF_BitStream *bs, u64 offset)
	bitstream seeking More...

void	gf_bs_truncate (GF_BitStream *bs)
	bitstream truncation More...

u32	gf_bs_peek_bits (GF_BitStream *bs, u32 numBits, u64 byte_offset)
	bit peeking More...

u8	gf_bs_bits_available (GF_BitStream *bs)
	bit reservoir query More...

u64	gf_bs_get_position (GF_BitStream *bs)
	position query More...

u64	gf_bs_get_size (GF_BitStream *bs)
	size query More...

u64	gf_bs_get_refreshed_size (GF_BitStream *bs)
	file-based size query More...

GF_Err	gf_bs_transfer (GF_BitStream dst, GF_BitStream src, Bool keep_src)
	transfer content from source bitstream to destination bitstream More...

void	gf_bs_flush (GF_BitStream *bs)
	Flushes bitstream content to disk. More...

void	gf_bs_enable_emulation_byte_removal (GF_BitStream *bs, Bool do_remove)
	NALU-based Annex B mode, only used for read mode. More...

u32	gf_bs_get_emulation_byte_removed (GF_BitStream *bs)
	NALU-based Annex B mode, only used for read mode. More...

GF_Err	gf_bs_insert_data (GF_BitStream bs, u8 data, u32 size, u64 offset)
	Inserts a data block, moving bytes to the end. More...

u64	gf_bs_set_cookie (GF_BitStream *bs, u64 cookie)
	Sets cookie. More...

u64	gf_bs_get_cookie (GF_BitStream *bs)
	Gets cookie. More...

char *	gf_bs_read_utf8 (GF_BitStream *bs)
	Reads string. More...

GF_Err	gf_bs_write_utf8 (GF_BitStream bs, const char str)
	Writes string. More...

void	gf_bs_mark_overflow (GF_BitStream *bs, Bool reset)
	Marks overflow access. More...

u32	gf_bs_is_overflow (GF_BitStream *bs)
	Gets overflow state. More...

Detailed Description

This section documents the bitstream object of the GPAC framework.

Note: Unless specified, all functions assume Big-Endian ordering of data in the bitstream.

Typedef Documentation

◆ GF_BitStream

typedef struct __tag_bitstream GF_BitStream

bitstream object

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

bitstream creation modes

Enumerator
GF_BITSTREAM_READ	read-only mode
GF_BITSTREAM_WRITE	read-write mode
GF_BITSTREAM_WRITE_DYN	allows reallocating the buffer passed in WRITE mode

Function Documentation

◆ gf_bs_new()

GF_BitStream* gf_bs_new	(	const u8 *	buffer,
		u64	size,
		u32	mode
	)

Constructs a bitstream from a buffer (read or write mode)

Parameters

buffer	buffer to read or write. In WRITE mode, this can be NULL to let the bitstream object dynamically allocate memory, in which case the size param is ignored.
size	size of the buffer given.
mode	operation mode for this bitstream: GF_BITSTREAM_READ for read, GF_BITSTREAM_WRITE for write.

Returns: new bitstream object

Note: In write mode on an existing data buffer, data overflow is never signaled but simply ignored, it is the caller responsibility to ensure it does not write more than possible.

◆ gf_bs_reassign_buffer()

GF_Err gf_bs_reassign_buffer	(	GF_BitStream *	bs,
		const u8 *	buffer,
		u64	size
	)

Reassigns a bitstream in GF_BITSTREAM_READ mode to a new buffer

Parameters

bs	the bitstream to reassign
buffer	buffer to read
size	size of the buffer given.

Returns: error code if any

◆ gf_bs_from_file()

GF_BitStream* gf_bs_from_file	(	FILE *	f,
		u32	mode
	)

Creates a bitstream from a file handle.

Parameters

f	handle of the file to use. This handle must be created with binary mode.
mode	operation mode for this bitstream: GF_BITSTREAM_READ for read, GF_BITSTREAM_WRITE for write.

Returns: new bitstream object

Note

- You have to open your file in the appropriated mode:

GF_BITSTREAM_READ: bitstream is constructed for reading
GF_BITSTREAM_WRITE: bitstream is constructed for writing

- you may use any of these modes for a file with read/write access.

Warning: RESULTS ARE UNEXPECTED IF YOU TOUCH THE FILE WHILE USING THE BITSTREAM.

◆ gf_bs_del()

void gf_bs_del ( GF_BitStream * bs )

Deletes the bitstream object. If the buffer was created by the bitstream, it is deleted if still present.

Warning: If the bitstream was constructed from a FILE object in write mode, the FILE object MUST be closed after destructing the bitstream

Parameters

bs	the target bitstream

◆ gf_bs_new_cbk()

GF_BitStream* gf_bs_new_cbk	(	GF_Err()(void cbk, u8 *data, u32 block_size)	on_block_out,
		void *	usr_data,
		u32	block_size
	)

Creates a bitstream from in write mode suing output callback.

Parameters

on_block_out	callback function used to write blocks.
usr_data	user data for callback.
block_size	internal buffer size used while dispatching bytes. If 0, defaults to 40k.

Returns: new bitstream object

◆ gf_bs_new_cbk_buffer()

GF_BitStream* gf_bs_new_cbk_buffer	(	GF_Err()(void cbk, u8 *data, u32 block_size)	on_block_out,
		void *	usr_data,
		u8 *	buffer,
		u32	buffer_size
	)

Creates a bitstream from in write mode suing output callback.

Parameters

on_block_out	callback function used to write blocks.
usr_data	user data for callback.
buffer	internal buffer to use while dispatching bytes. If NULL, buffer is allocated internally using buffer_size.
buffer_size	internal buffer size used while dispatching bytes. If 0, defaults to 40k.

Returns: new bitstream object

◆ gf_bs_prevent_dispatch()

void gf_bs_prevent_dispatch	(	GF_BitStream *	bs,
		Bool	prevent_dispatch
	)

Warning: Block dispatch prevention acts in a counter mode: you must call as many time the function with prevent_dispatch = GF_FALSE as you called the function with prevent_dispatch = GF_TRUE

Parameters

bs	the target bitstream
prevent_dispatch	activates temporary internal storage if set

◆ gf_bs_read_int()

u32 gf_bs_read_int	(	GF_BitStream *	bs,
		u32	nBits
	)

Reads an integer coded on a number of bit.

Parameters

bs	the target bitstream
nBits	the number of bits to read

Returns: the integer value read.

◆ gf_bs_read_long_int()

u64 gf_bs_read_long_int	(	GF_BitStream *	bs,
		u32	nBits
	)

Reads a large integer coded on a number of bit bigger than 32.

Parameters

bs	the target bitstream
nBits	the number of bits to read

Returns: the large integer value read.

◆ gf_bs_read_float()

Float gf_bs_read_float ( GF_BitStream * bs )

Reads a float coded as IEEE 32 bit format.

Parameters

bs	the target bitstream

Returns: the float value read.

◆ gf_bs_read_double()

Double gf_bs_read_double ( GF_BitStream * bs )

Reads a double coded as IEEE 64 bit format.

Parameters

bs	the target bitstream

Returns: the double value read.

◆ gf_bs_read_data()

u32 gf_bs_read_data	(	GF_BitStream *	bs,
		u8 *	data,
		u32	nbBytes
	)

Reads a data buffer. Emultation prevention byte removal is NOT applied here

Parameters

bs	the target bitstream
data	the data buffer to be filled
nbBytes	the amount of bytes to read

Returns: the number of bytes actually read.

Warning: the data buffer passed must be large enough to hold the desired amount of bytes.

◆ gf_bs_read_u8()

u32 gf_bs_read_u8 ( GF_BitStream * bs )

Reads an integer coded on 8 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream

Returns: the char value read.

◆ gf_bs_read_u16()

u32 gf_bs_read_u16 ( GF_BitStream * bs )

Reads an integer coded on 16 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream

Returns: the short value read.

◆ gf_bs_read_u24()

u32 gf_bs_read_u24 ( GF_BitStream * bs )

Reads an integer coded on 24 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_read_u32()

u32 gf_bs_read_u32 ( GF_BitStream * bs )

Reads an integer coded on 32 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_read_u64()

u64 gf_bs_read_u64 ( GF_BitStream * bs )

Reads an integer coded on 64 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream

Returns: the large integer value read.

◆ gf_bs_read_u64_le()

u64 gf_bs_read_u64_le ( GF_BitStream * bs )

Reads an integer coded on 64 bits in little-endian order.

Parameters

bs	the target bitstream

Returns: the large integer value read.

◆ gf_bs_read_u32_le()

u32 gf_bs_read_u32_le ( GF_BitStream * bs )

Reads an integer coded on 32 bits in little-endian order.

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_read_u16_le()

u16 gf_bs_read_u16_le ( GF_BitStream * bs )

Reads an integer coded on 16 bits in little-endian order.

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_read_vluimsbf5()

u32 gf_bs_read_vluimsbf5 ( GF_BitStream * bs )

Reads an integer coded on a variable number of 4-bits chunks. The number of chunks is given by the number of non-0 bits at the beginning.

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_get_bit_offset()

u32 gf_bs_get_bit_offset ( GF_BitStream * bs )

Returns current bit position in the bitstream - only works in memory mode.

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_get_bit_position()

u32 gf_bs_get_bit_position ( GF_BitStream * bs )

Returns bit position in the current byte of the bitstream - only works in memory mode.

Parameters

bs	the target bitstream

Returns: the integer value read.

◆ gf_bs_write_int()

void gf_bs_write_int	(	GF_BitStream *	bs,
		s32	value,
		s32	nBits
	)

Writes an integer on a given number of bits.

Parameters

bs	the target bitstream
value	the integer to write
nBits	number of bits used to code the integer

◆ gf_bs_write_long_int()

void gf_bs_write_long_int	(	GF_BitStream *	bs,
		s64	value,
		s32	nBits
	)

Writes an integer on a given number of bits greater than 32.

Parameters

bs	the target bitstream
value	the large integer to write
nBits	number of bits used to code the integer

◆ gf_bs_write_float()

void gf_bs_write_float	(	GF_BitStream *	bs,
		Float	value
	)

Writes a float in IEEE 32 bits format.

Parameters

bs	the target bitstream
value	the float to write

◆ gf_bs_write_double()

void gf_bs_write_double	(	GF_BitStream *	bs,
		Double	value
	)

Writes a double in IEEE 64 bits format.

Parameters

bs	the target bitstream
value	the double to write

◆ gf_bs_write_data()

u32 gf_bs_write_data	(	GF_BitStream *	bs,
		const u8 *	data,
		u32	nbBytes
	)

Writes a data buffer.

Parameters

bs	the target bitstream
data	the data to write
nbBytes	number of data bytes to write

Returns: the number of written bytes

◆ gf_bs_write_u8()

void gf_bs_write_u8	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 8 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream
value	the char value to write

◆ gf_bs_write_u16()

void gf_bs_write_u16	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 16 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream
value	the short value to write

◆ gf_bs_write_u24()

void gf_bs_write_u24	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 24 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream
value	the integer value to write

◆ gf_bs_write_u32()

void gf_bs_write_u32	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 32 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream
value	the integer value to write

◆ gf_bs_write_u64()

void gf_bs_write_u64	(	GF_BitStream *	bs,
		u64	value
	)

Writes an integer on 64 bits starting at a byte boundary in the bitstream.

Warning: you must not use this function if the bitstream is not aligned

Parameters

bs	the target bitstream
value	the large integer value to write

◆ gf_bs_write_u32_le()

void gf_bs_write_u32_le	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 32 bits in little-endian order.

Parameters

bs	the target bitstream
value	the integer value to write

◆ gf_bs_write_u64_le()

void gf_bs_write_u64_le	(	GF_BitStream *	bs,
		u64	value
	)

Writes an integer on 64 bits in little-endian order.

Parameters

bs	the target bitstream
value	the integer value to write

◆ gf_bs_write_u16_le()

void gf_bs_write_u16_le	(	GF_BitStream *	bs,
		u32	value
	)

Writes an integer on 16 bits in little-endian order.

Parameters

bs	the target bitstream
value	the short value to write

◆ gf_bs_write_byte()

u32 gf_bs_write_byte	(	GF_BitStream *	bs,
		u8	byte,
		u32	count
	)

Writes a give byte multiple times.

Parameters

bs	the target bitstream
byte	the byte value to write
count	the number of times the byte should be written

Returns: the number of bytes written

◆ gf_bs_set_eos_callback()

void gf_bs_set_eos_callback	(	GF_BitStream *	bs,
		void()(void par)	EndOfStream,
		void *	par
	)

Assigns a notification callback function for end of stream signaling in read mode

Parameters

bs	the target bitstream
EndOfStream	the notification function to use
par	opaque user data passed to the bitstream

◆ gf_bs_is_align()

Bool gf_bs_is_align ( GF_BitStream * bs )

Checks if bitstream position is aligned to a byte boundary.

Parameters

bs	the target bitstream

Returns: GF_TRUE if aligned with regard to the read/write mode, GF_FALSE otherwise

◆ gf_bs_align()

u8 gf_bs_align ( GF_BitStream * bs )

Aligns bitstream to next byte boundary. In write mode, this will write 0 bit values until alignment.

Parameters

bs	the target bitstream

Returns: the number of bits read/written until alignment

◆ gf_bs_available()

u64 gf_bs_available ( GF_BitStream * bs )

Returns the number of bytes still available in the bitstream in read mode.

Parameters

bs	the target bitstream

Returns: the number of bytes still available in read mode, -1 in write modes.

◆ gf_bs_get_content()

void gf_bs_get_content	(	GF_BitStream *	bs,
		u8 **	output,
		u32 *	outSize
	)

Fetches the internal bitstream buffer in write mode. If a buffer was given at the bitstream construction, or if the bitstream is in read mode, this does nothing.

Parameters

bs	the target bitstream
output	address of the memory block allocated by the bitstream.
outSize	size of the allocated memory block.

Note

It is the user responsibility to destroy the allocated buffer
Once this function has been called, the internal bitstream buffer is reseted.

◆ gf_bs_get_content_no_truncate()

void gf_bs_get_content_no_truncate	(	GF_BitStream *	bs,
		u8 **	output,
		u32 *	outSize,
		u32 *	allocSize
	)

Fetches the internal bitstream buffer in write mode. If a buffer was given at the bitstream construction, or if the bitstream is in read mode, this does nothing. Retrieves both the allocated buffer size and the written size

Parameters

bs	the target bitstream
output	address of the memory block allocated by the bitstream.
outSize	number of bytes written in the allocated memory block.
allocSize	size of the allocated memory block.

Note

It is the user responsibility to destroy the allocated buffer
Once this function has been called, the internal bitstream buffer is reseted.

◆ gf_bs_skip_bytes()

void gf_bs_skip_bytes	(	GF_BitStream *	bs,
		u64	nbBytes
	)

Skips bytes in the bitstream. In Write mode, this will write the 0 integer value for memory-based bitstreams or seek the stream for file-based bitstream. In read mode, emultation prevention byte is applied if enabled

Parameters

bs	the target bitstream
nbBytes	the number of bytes to skip

◆ gf_bs_seek()

GF_Err gf_bs_seek	(	GF_BitStream *	bs,
		u64	offset
	)

Seeks the bitstream to a given offset after the beginning of the stream. This will perform alignment of the bitstream in all modes.

Warning: Results are unpredictable if seeking beyond the bitstream end is performed.

Parameters

bs	the target bitstream
offset	buffer/file offset to seek to

Returns: error if any

◆ gf_bs_truncate()

void gf_bs_truncate ( GF_BitStream * bs )

Truncates the bitstream at the current position

Parameters

bs	the target bitstream

◆ gf_bs_peek_bits()

u32 gf_bs_peek_bits	(	GF_BitStream *	bs,
		u32	numBits,
		u64	byte_offset
	)

Peeks a given number of bits (read without moving the position indicator) for read modes only.

Parameters

bs	the target bitstream
numBits	the number of bits to peek
byte_offset	if set, bitstream is aligned and moved from byte_offset before peeking (byte-aligned picking) otherwise, bitstream is not aligned and bits are peeked from current state

Returns: the integer value read

◆ gf_bs_bits_available()

u8 gf_bs_bits_available ( GF_BitStream * bs )

Queries the number of bits available in read mode.

Parameters

bs	the target bitstream

Returns: number of available bits if position is in the last byte of the buffer/stream, 8 otherwise

◆ gf_bs_get_position()

u64 gf_bs_get_position ( GF_BitStream * bs )

Returns the reading/writting position in the buffer/file.

Parameters

bs	the target bitstream

Returns: the read/write position of the bitstream

◆ gf_bs_get_size()

u64 gf_bs_get_size ( GF_BitStream * bs )

Returns the size of the associated buffer/file.

Parameters

bs	the target bitstream

Returns: the size of the bitstream

◆ gf_bs_get_refreshed_size()

u64 gf_bs_get_refreshed_size ( GF_BitStream * bs )

Returns the size of a file-based bitstream and force a seek to end of file. This is used in case the file handle describes a file being constructed on disk while being read?

Parameters

bs	the target bitstream

Returns: the disk size of the associated file

◆ gf_bs_transfer()

GF_Err gf_bs_transfer	(	GF_BitStream *	dst,
		GF_BitStream *	src,
		Bool	keep_src
	)

Parameters

dst	the target bitstream
src	the source bitstream.
keep_src	If not set, the source bitstream is empty after calling the function

Returns: error if any

◆ gf_bs_flush()

void gf_bs_flush ( GF_BitStream * bs )

Flushes bitstream contet to disk

Parameters

bs	the target bitstream

◆ gf_bs_enable_emulation_byte_removal()

void gf_bs_enable_emulation_byte_removal	(	GF_BitStream *	bs,
		Bool	do_remove
	)

Enables or disable emulation byte prevention for NALU-based annex B formats in read mode. This does NOT apply to gf_bs_read_data nor gf_bs_skip_bytes

Parameters

bs	the target bitstream
do_remove	if true, emulation prevention bytes will be removed

◆ gf_bs_get_emulation_byte_removed()

u32 gf_bs_get_emulation_byte_removed ( GF_BitStream * bs )

Enables or disable emulation byte prevention for NALU-based annex B formats in read mode.

Parameters

bs	the target bitstream

Returns: number of bytes currently removed

◆ gf_bs_insert_data()

GF_Err gf_bs_insert_data	(	GF_BitStream *	bs,
		u8 *	data,
		u32	size,
		u64	offset
	)

Inserts a data block at a given position, pushing all bytes after the insertion point to the end of the stream. This does NOT work if gf_bs_enable_emulation_byte_removal or gf_bs_new_cbk where used. The position after the call will be the same as before the call. If the position is not the end of the bitstream all bytes after the position will be lost.

Parameters

bs	the target bitstream
data	block to insert
size	size of the block to insert
offset	insertion offset from bitstream start

Returns: error code if any

◆ gf_bs_set_cookie()

u64 gf_bs_set_cookie	(	GF_BitStream *	bs,
		u64	cookie
	)

Sets a 64 bit cookie (integer, pointer) on the bitstream, returning the current cookie value

Parameters

bs	the target bitstream
cookie	the new cookie to assign

Returns: the cookie value before re-assign

◆ gf_bs_get_cookie()

u64 gf_bs_get_cookie ( GF_BitStream * bs )

Gets the current cookie on the bitstream

Parameters

bs	the target bitstream

Returns: the current cookie value

◆ gf_bs_read_utf8()

char* gf_bs_read_utf8 ( GF_BitStream * bs )

reads utf-8 NULL-terminated string - bitstream must be aligned

Parameters

bs	the target bitstream

Returns: the string read or NULL if error - MUST be freed by user

◆ gf_bs_write_utf8()

GF_Err gf_bs_write_utf8	(	GF_BitStream *	bs,
		const char *	str
	)

Writes utf-8 NULL-terminated string - bitstream must be aligned

Parameters

bs	the target bitstream
str	UTF-8 string to write

Returns: error if any

◆ gf_bs_mark_overflow()

void gf_bs_mark_overflow	(	GF_BitStream *	bs,
		Bool	reset
	)

Marks the bitstream as overflown (reading outside of buffer range). Marking is done automatically when reading but can be forced using this function.

Parameters

bs	the target bitstream
reset	if GF_TRUE, reset overflown state, otherwise mark as overflown

◆ gf_bs_is_overflow()

u32 gf_bs_is_overflow ( GF_BitStream * bs )

Gets overflow state of the bitstream

Parameters

bs	the target bitstream

Returns: 2 if an overflow was marked by user using gf_bs_mark_overflow, 1 if an overflow occured, 0 otherwise

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

◆ GF_BitStream

Enumeration Type Documentation

◆ anonymous enum

Function Documentation

◆ gf_bs_new()

◆ gf_bs_reassign_buffer()

◆ gf_bs_from_file()

◆ gf_bs_del()

◆ gf_bs_new_cbk()

◆ gf_bs_new_cbk_buffer()

◆ gf_bs_prevent_dispatch()

◆ gf_bs_read_int()

◆ gf_bs_read_long_int()

◆ gf_bs_read_float()

◆ gf_bs_read_double()

◆ gf_bs_read_data()

◆ gf_bs_read_u8()

◆ gf_bs_read_u16()

◆ gf_bs_read_u24()

◆ gf_bs_read_u32()

◆ gf_bs_read_u64()

◆ gf_bs_read_u64_le()

◆ gf_bs_read_u32_le()

◆ gf_bs_read_u16_le()

◆ gf_bs_read_vluimsbf5()

◆ gf_bs_get_bit_offset()

◆ gf_bs_get_bit_position()

◆ gf_bs_write_int()

◆ gf_bs_write_long_int()

◆ gf_bs_write_float()

◆ gf_bs_write_double()

◆ gf_bs_write_data()

◆ gf_bs_write_u8()

◆ gf_bs_write_u16()

◆ gf_bs_write_u24()

◆ gf_bs_write_u32()

◆ gf_bs_write_u64()

◆ gf_bs_write_u32_le()

◆ gf_bs_write_u64_le()

◆ gf_bs_write_u16_le()

◆ gf_bs_write_byte()

◆ gf_bs_set_eos_callback()

◆ gf_bs_is_align()

◆ gf_bs_align()

◆ gf_bs_available()

◆ gf_bs_get_content()

◆ gf_bs_get_content_no_truncate()

◆ gf_bs_skip_bytes()

◆ gf_bs_seek()

◆ gf_bs_truncate()

◆ gf_bs_peek_bits()

◆ gf_bs_bits_available()

◆ gf_bs_get_position()

◆ gf_bs_get_size()

◆ gf_bs_get_refreshed_size()

◆ gf_bs_transfer()

◆ gf_bs_flush()

◆ gf_bs_enable_emulation_byte_removal()

◆ gf_bs_get_emulation_byte_removed()

◆ gf_bs_insert_data()

◆ gf_bs_set_cookie()

◆ gf_bs_get_cookie()

◆ gf_bs_read_utf8()

◆ gf_bs_write_utf8()

◆ gf_bs_mark_overflow()

◆ gf_bs_is_overflow()