implements a faster HTJ2K block decoder using wasm simd More...

#include <string>
#include <iostream>
#include <cassert>
#include <cstring>
#include "ojph_block_common.h"
#include "ojph_block_decoder.h"
#include "ojph_arch.h"
#include "ojph_message.h"
#include <wasm_simd128.h>

Classes
struct	ojph::local::dec_mel_st
	MEL state structure for reading and decoding the MEL bitstream. More...
struct	ojph::local::rev_struct
	A structure for reading and unstuffing a segment that grows backward, such as VLC and MRP. More...
struct	ojph::local::frwd_struct
	State structure for reading and unstuffing of forward-growing bitstreams; these are: MagSgn and SPP bitstreams. More...

Namespaces
namespace	ojph
namespace	ojph::local

Macros
#define	OJPH_REPEAT2(a)
	Macros that help with typing and space.
#define	OJPH_REPEAT4(a)
#define	OJPH_REPEAT8(a)
#define	OJPH_REPEAT16(a)

Functions
static void	ojph::local::mel_read (dec_mel_st *melp)
	Reads and unstuffs the MEL bitstream.
static void	ojph::local::mel_decode (dec_mel_st *melp)
	Decodes unstuffed MEL segment bits stored in tmp to runs.
static void	ojph::local::mel_init (dec_mel_st melp, ui8 bbuf, int lcup, int scup)
	Initiates a dec_mel_st structure for MEL decoding and reads some bytes in order to get the read address to a multiple of 4.
static int	ojph::local::mel_get_run (dec_mel_st *melp)
	Retrieves one run from dec_mel_st; if there are no runs stored MEL segment is decoded.
static void	ojph::local::rev_read (rev_struct *vlcp)
	Read and unstuff data from a backwardly-growing segment.
static void	ojph::local::rev_init (rev_struct vlcp, ui8 data, int lcup, int scup)
	Initiates the rev_struct structure and reads a few bytes to move the read address to multiple of 4.
static ui32	ojph::local::rev_fetch (rev_struct *vlcp)
	Retrieves 32 bits from the head of a rev_struct structure.
static ui32	ojph::local::rev_advance (rev_struct *vlcp, ui32 num_bits)
	Consumes num_bits from a rev_struct structure.
static void	ojph::local::rev_read_mrp (rev_struct *mrp)
	Reads and unstuffs from rev_struct.
static void	ojph::local::rev_init_mrp (rev_struct mrp, ui8 data, int lcup, int len2)
	Initialized rev_struct structure for MRP segment, and reads a number of bytes such that the next 32 bits read are from an address that is a multiple of 4. Note this is designed for an architecture that read size must be compatible with the alignment of the read address.
static ui32	ojph::local::rev_fetch_mrp (rev_struct *mrp)
	Retrieves 32 bits from the head of a rev_struct structure.
static ui32	ojph::local::rev_advance_mrp (rev_struct *mrp, ui32 num_bits)
	Consumes num_bits from a rev_struct structure.
template<int X>
static void	ojph::local::frwd_read (frwd_struct *msp)
	Read and unstuffs 16 bytes from forward-growing bitstream.
template<int X>
static void	ojph::local::frwd_init (frwd_struct msp, const ui8 data, int size)
	Initialize frwd_struct struct and reads some bytes.
static void	ojph::local::frwd_advance (frwd_struct *msp, ui32 num_bits)
	Consume num_bits bits from the bitstream of frwd_struct.
template<int X>
static v128_t	ojph::local::frwd_fetch (frwd_struct *msp)
	Fetches 32 bits from the frwd_struct bitstream.
template<int N>
static v128_t	ojph::local::decode_one_quad32 (const v128_t inf_u_q, v128_t U_q, frwd_struct *magsgn, ui32 p, v128_t &vn)
	decodes one quad, using 32 bit data
static v128_t	ojph::local::decode_two_quad16 (const v128_t inf_u_q, v128_t U_q, frwd_struct *magsgn, ui32 p, v128_t &vn)
	decodes twos consecutive quads (one octet), using 16 bit data
bool	ojph::local::ojph_decode_codeblock_wasm (ui8 coded_data, ui32 decoded_data, ui32 missing_msbs, ui32 num_passes, ui32 lengths1, ui32 lengths2, ui32 width, ui32 height, ui32 stride, bool stripe_causal)
	Decodes one codeblock, processing the cleanup, siginificance propagation, and magnitude refinement pass.