bitstream.c File Reference

#include <gpac/bitstream.h>

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Data Structures
struct	GF_BitStream

Macros
#define	BS_MEM_BLOCK_ALLOC_SIZE   512
#define	NO_OPTS

Enumerations
enum	{ GF_BITSTREAM_FILE_READ = GF_BITSTREAM_WRITE_DYN + 1 , GF_BITSTREAM_FILE_WRITE }

Functions
GF_EXPORT GF_Err	gf_bs_reassign_buffer (GF_BitStream *bs, const u8 *buffer, u64 BufferSize)
	bitstream reassignment
GF_EXPORT GF_BitStream *	gf_bs_new (const u8 *buffer, u64 BufferSize, u32 mode)
	bitstream constructor
GF_EXPORT GF_BitStream *	gf_bs_from_file (FILE *f, u32 mode)
	bitstream constructor from file handle
GF_EXPORT GF_BitStream *	gf_bs_from_fd (int fd, u32 mode)
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
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
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.
static Bool	bs_flush_write_cache (GF_BitStream *bs)
GF_EXPORT void	gf_bs_del (GF_BitStream *bs)
	bitstream destructor from file handle
GF_EXPORT void	gf_bs_enable_emulation_byte_removal (GF_BitStream *bs, Bool do_remove)
	NALU-based Annex B mode, only used for read mode.
GF_EXPORT u32	gf_bs_get_emulation_byte_removed (GF_BitStream *bs)
	NALU-based Annex B mode, only used for read mode.
Bool	gf_bs_is_align (GF_BitStream *bs)
	bitstream alignment checking
static GFINLINE u8	gf_bs_load_byte (GF_BitStream *bs, Bool *is_eos)
static u8	BS_ReadByte (GF_BitStream *bs)
GF_EXPORT u8	gf_bs_read_bit (GF_BitStream *bs)
GF_EXPORT u32	gf_bs_read_int (GF_BitStream *bs, u32 nBits)
	integer reading
GF_EXPORT u32	gf_bs_read_u8 (GF_BitStream *bs)
	align char reading
GF_EXPORT u32	gf_bs_read_u16 (GF_BitStream *bs)
	align short reading
GF_EXPORT u32	gf_bs_read_u24 (GF_BitStream *bs)
	align 24-bit integer reading
GF_EXPORT u32	gf_bs_read_u32 (GF_BitStream *bs)
	align integer reading
GF_EXPORT u64	gf_bs_read_u64 (GF_BitStream *bs)
	align large integer reading
GF_EXPORT u64	gf_bs_read_long_int (GF_BitStream *bs, u32 nBits)
	large integer reading
GF_EXPORT Float	gf_bs_read_float (GF_BitStream *bs)
	float reading
GF_EXPORT Double	gf_bs_read_double (GF_BitStream *bs)
	double reading
GF_EXPORT u32	gf_bs_read_data (GF_BitStream *bs, u8 *data, u32 nbBytes)
	data reading
static void	BS_WriteByte (GF_BitStream *bs, u8 val)
static void	BS_WriteBit (GF_BitStream *bs, u32 bit)
static s32	bs_handle_nbits_overflow (GF_BitStream *bs, s32 nBits, s32 max_shift)
GF_EXPORT void	gf_bs_write_int (GF_BitStream *bs, s32 _value, s32 nBits)
	integer writing
GF_EXPORT void	gf_bs_write_long_int (GF_BitStream *bs, s64 _value, s32 nBits)
	large integer writing
GF_EXPORT void	gf_bs_write_u8 (GF_BitStream *bs, u32 value)
	align char writing
GF_EXPORT void	gf_bs_write_u16 (GF_BitStream *bs, u32 value)
	align short writing
GF_EXPORT void	gf_bs_write_u24 (GF_BitStream *bs, u32 value)
	align 24-bits integer writing
GF_EXPORT void	gf_bs_write_u32 (GF_BitStream *bs, u32 value)
	align integer writing
GF_EXPORT void	gf_bs_write_u64 (GF_BitStream *bs, u64 value)
	align large integer writing
GF_EXPORT u32	gf_bs_write_byte (GF_BitStream *bs, u8 byte, u32 repeat_count)
	write byte multiple times
GF_EXPORT void	gf_bs_write_float (GF_BitStream *bs, Float value)
	float writing
GF_EXPORT void	gf_bs_write_double (GF_BitStream *bs, Double value)
	double writing
GF_EXPORT u32	gf_bs_write_data (GF_BitStream *bs, const u8 *data, u32 nbBytes)
	data writing
GF_EXPORT u8	gf_bs_align (GF_BitStream *bs)
	bitstream alignment
GF_EXPORT u64	gf_bs_available (GF_BitStream *bs)
	capacity query
static s32	BS_CutBuffer (GF_BitStream *bs)
GF_EXPORT void	gf_bs_get_content_no_truncate (GF_BitStream *bs, u8 **output, u32 *outSize, u32 *alloc_size)
	buffer fetching
GF_EXPORT void	gf_bs_get_content (GF_BitStream *bs, u8 **output, u32 *outSize)
	buffer fetching
GF_Err	gf_bs_grow (GF_BitStream *bs, u32 addSize)
GF_EXPORT void	gf_bs_skip_bytes (GF_BitStream *bs, u64 nbBytes)
	byte skipping
static GF_Err	BS_SeekIntern (GF_BitStream *bs, u64 offset)
GF_EXPORT GF_Err	gf_bs_seek (GF_BitStream *bs, u64 offset)
	bitstream seeking
GF_EXPORT u32	gf_bs_peek_bits (GF_BitStream *bs, u32 numBits, u64 byte_offset)
	bit peeking
GF_EXPORT u64	gf_bs_get_refreshed_size (GF_BitStream *bs)
	file-based size query
GF_EXPORT u64	gf_bs_get_size (GF_BitStream *bs)
	size query
GF_EXPORT u64	gf_bs_get_position (GF_BitStream *bs)
	position query
GF_EXPORT u8	gf_bs_bits_available (GF_BitStream *bs)
	bit reservoir query
GF_EXPORT void	gf_bs_set_eos_callback (GF_BitStream *bs, void(*EndOfStream)(void *par), void *par)
	end of bitstream management
GF_EXPORT u64	gf_bs_read_u64_le (GF_BitStream *bs)
	little endian integer reading
GF_EXPORT u32	gf_bs_read_u32_le (GF_BitStream *bs)
	little endian integer reading
GF_EXPORT u16	gf_bs_read_u16_le (GF_BitStream *bs)
	little endian integer reading
GF_EXPORT void	gf_bs_write_u64_le (GF_BitStream *bs, u64 val)
	little endian large integer writing
GF_EXPORT void	gf_bs_write_u32_le (GF_BitStream *bs, u32 val)
	little endian integer writing
GF_EXPORT void	gf_bs_write_u16_le (GF_BitStream *bs, u32 val)
	little endian short writing
GF_EXPORT u32	gf_bs_get_bit_offset (GF_BitStream *bs)
	bit position
GF_EXPORT u32	gf_bs_get_bit_position (GF_BitStream *bs)
	current bit position
GF_EXPORT u32	gf_bs_read_vluimsbf5 (GF_BitStream *bs)
	variable length integer reading
GF_EXPORT void	gf_bs_truncate (GF_BitStream *bs)
	bitstream truncation
void	gf_bs_untruncate (GF_BitStream *bs)
GF_EXPORT GF_Err	gf_bs_transfer (GF_BitStream *dst, GF_BitStream *src, Bool keep_src)
	transfer content from source bitstream to destination bitstream
GF_EXPORT void	gf_bs_flush (GF_BitStream *bs)
	Flushes bitstream content to disk.
u64	gf_bs_set_cookie (GF_BitStream *bs, u64 cookie)
	Sets cookie.
u64	gf_bs_get_cookie (GF_BitStream *bs)
	Gets cookie.
GF_EXPORT GF_Err	gf_bs_insert_data (GF_BitStream *bs, u8 *data, u32 size, u64 offset)
	Inserts a data block, moving bytes to the end.
GF_Err	gf_bs_set_logger (GF_BitStream *bs, void(*on_bs_log)(void *udta, const char *field_name, u32 nb_bits, u64 field_val, s32 idx1, s32 idx2, s32 idx3), void *udta)
void	gf_bs_log_idx (GF_BitStream *bs, u32 nBits, const char *fname, s64 val, s32 idx1, s32 idx2, s32 idx3)
void	gf_bs_mark_overflow (GF_BitStream *bs, Bool reset)
	Marks overflow access.
GF_EXPORT u32	gf_bs_is_overflow (GF_BitStream *bs)
	Gets overflow state.
GF_EXPORT char *	gf_bs_read_utf8 (GF_BitStream *bs)
	Reads string.
GF_EXPORT GF_Err	gf_bs_write_utf8 (GF_BitStream *bs, const char *str)
	Writes string.

Macro Definition Documentation

BS_MEM_BLOCK_ALLOC_SIZE

#define BS_MEM_BLOCK_ALLOC_SIZE   512

NO_OPTS

#define NO_OPTS

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
GF_BITSTREAM_FILE_READ
GF_BITSTREAM_FILE_WRITE

Function Documentation

gf_bs_from_fd()

GF_EXPORT GF_BitStream * gf_bs_from_fd	(	int	fd,
		u32	mode
	)

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bs_flush_write_cache()

static Bool bs_flush_write_cache ( GF_BitStream *  bs )

static

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gf_bs_load_byte()

static GFINLINE u8 gf_bs_load_byte ( GF_BitStream *  bs, Bool *  is_eos  )

static

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BS_ReadByte()

static u8 BS_ReadByte ( GF_BitStream *  bs )

static

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gf_bs_read_bit()

GF_EXPORT u8 gf_bs_read_bit

(

GF_BitStream *

bs

)

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BS_WriteByte()

static void BS_WriteByte ( GF_BitStream *  bs, u8  val  )

static

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BS_WriteBit()

static void BS_WriteBit ( GF_BitStream *  bs, u32  bit  )

static

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bs_handle_nbits_overflow()

static s32 bs_handle_nbits_overflow ( GF_BitStream *  bs, s32  nBits, s32  max_shift  )

static

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BS_CutBuffer()

static s32 BS_CutBuffer ( GF_BitStream *  bs )

static

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gf_bs_grow()

GF_Err gf_bs_grow	(	GF_BitStream *	bs,
		u32	addSize
	)

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BS_SeekIntern()

static GF_Err BS_SeekIntern ( GF_BitStream *  bs, u64  offset  )

static

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gf_bs_untruncate()

void gf_bs_untruncate

(

GF_BitStream *

bs

)

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gf_bs_set_logger()

GF_Err gf_bs_set_logger	(	GF_BitStream *	bs,
		void(*)(void *udta, const char *field_name, u32 nb_bits, u64 field_val, s32 idx1, s32 idx2, s32 idx3)	on_bs_log,
		void *	udta
	)

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gf_bs_log_idx()

void gf_bs_log_idx	(	GF_BitStream *	bs,
		u32	nBits,
		const char *	fname,
		s64	val,
		s32	idx1,
		s32	idx2,
		s32	idx3
	)

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