bitstream.c File Reference

bitstream api. More...

Include dependency graph for bitstream.c:

Defines
#define	DEBUGF   printf
#define	GET_DATA(v, table, i, wrap, size)
Functions
void *	ff_realloc_static (void *ptr, unsigned int size)
	Same as av_mallocz_static(), but does a realloc.
void	align_put_bits (PutBitContext *s)
void	ff_put_string (PutBitContext *pbc, char *s, int put_zero)
static int	alloc_table (VLC *vlc, int size)
static int	build_table (VLC *vlc, int table_nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, uint32_t code_prefix, int n_prefix)
int	init_vlc (VLC *vlc, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, int flags)
Variables
const uint8_t	ff_sqrt_tab [128]
const uint8_t	ff_log2_tab [256]

---

Detailed Description

bitstream api.

---

Define Documentation

#define DEBUGF   printf

Referenced by alloc_table().

#define GET_DATA	(	v,
		table,
		i,
		wrap,
		size		)

Value:

{\
    const uint8_t *ptr = (const uint8_t *)table + i * wrap;\
    switch(size) {\
    case 1:\
        v = *(const uint8_t *)ptr;\
        break;\
    case 2:\
        v = *(const uint16_t *)ptr;\
        break;\
    default:\
        v = *(const uint32_t *)ptr;\
        break;\
    }\
}

Referenced by build_table().

---

Function Documentation

void align_put_bits

(

PutBitContext *

s

)

References PutBitContext::bit_left, and put_bits().

Referenced by flush_put_bits().

static int alloc_table	(	VLC *	vlc,
		int	size
	)			[static]

References VLC::bits, DEBUGF, index, VLC::table, VLC::table_allocated, and VLC::table_size.

Referenced by build_table().

static int build_table	(	VLC *	vlc,
		int	table_nb_bits,
		int	nb_codes,
		const void *	bits,
		int	bits_wrap,
		int	bits_size,
		const void *	codes,
		int	codes_wrap,
		int	codes_size,
		uint32_t	code_prefix,
		int	n_prefix
	)			[static]

References alloc_table(), GET_DATA, i, index, INIT_VLC_LE, VLC::table, and VLC_TYPE.

Referenced by init_vlc().

void ff_put_string	(	PutBitContext *	pbc,
		char *	s,
		int	put_zero
	)

References put_bits().

void* ff_realloc_static	(	void *	ptr,
		unsigned int	size
	)

Same as av_mallocz_static(), but does a realloc.

Parameters:

[in]	ptr	The block of memory to reallocate.
[in]	size	The requested size.

Returns:

Block of memory of requested size.

Deprecated:

. Code which uses ff_realloc_static is broken/missdesigned and should correctly use static arrays

int init_vlc	(	VLC *	vlc,
		int	nb_bits,
		int	nb_codes,
		const void *	bits,
		int	bits_wrap,
		int	bits_size,
		const void *	codes,
		int	codes_wrap,
		int	codes_size,
		int	flags
	)

References VLC::bits, build_table(), and VLC::table_size.

Referenced by init_coef_vlc(), and wma_decode_init().

---

Variable Documentation

const uint8_t ff_log2_tab[256]

Initial value:

{
        0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
        5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
        6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
        7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
}

Referenced by av_log2().

const uint8_t ff_sqrt_tab[128]

Initial value:

{
        0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
        5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
        9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
}