OpenJPH
Open-source implementation of JPEG2000 Part-15
ojph_block_decoder_wasm.cpp File Reference

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>

Go to the source code of this file.

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

Functions

static void ojph::local::mel_read (dec_mel_st *melp)
 Reads and unstuffs the MEL bitstream. More...
 
static void ojph::local::mel_decode (dec_mel_st *melp)
 Decodes unstuffed MEL segment bits stored in tmp to runs. More...
 
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. More...
 
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. More...
 
static void ojph::local::rev_read (rev_struct *vlcp)
 Read and unstuff data from a backwardly-growing segment. More...
 
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. More...
 
static ui32 ojph::local::rev_fetch (rev_struct *vlcp)
 Retrieves 32 bits from the head of a rev_struct structure. More...
 
static ui32 ojph::local::rev_advance (rev_struct *vlcp, ui32 num_bits)
 Consumes num_bits from a rev_struct structure. More...
 
static void ojph::local::rev_read_mrp (rev_struct *mrp)
 Reads and unstuffs from rev_struct. More...
 
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. More...
 
static ui32 ojph::local::rev_fetch_mrp (rev_struct *mrp)
 Retrieves 32 bits from the head of a rev_struct structure. More...
 
static ui32 ojph::local::rev_advance_mrp (rev_struct *mrp, ui32 num_bits)
 Consumes num_bits from a rev_struct structure. More...
 
template<int X>
static void ojph::local::frwd_read (frwd_struct *msp)
 Read and unstuffs 16 bytes from forward-growing bitstream. More...
 
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. More...
 
static void ojph::local::frwd_advance (frwd_struct *msp, ui32 num_bits)
 Consume num_bits bits from the bitstream of frwd_struct. More...
 
template<int X>
static v128_t ojph::local::frwd_fetch (frwd_struct *msp)
 Fetches 32 bits from the frwd_struct bitstream. More...
 
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 More...
 
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 More...
 
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. More...
 

Detailed Description

implements a faster HTJ2K block decoder using wasm simd

Definition in file ojph_block_decoder_wasm.cpp.

Macro Definition Documentation

◆ OJPH_REPEAT16

#define OJPH_REPEAT16 (   a)    a,a,a,a,a,a,a,a,a,a,a,a,a,a,a,a

Definition at line 64 of file ojph_block_decoder_wasm.cpp.

◆ OJPH_REPEAT2

#define OJPH_REPEAT2 (   a)    a,a

Macros that help with typing and space.

Definition at line 61 of file ojph_block_decoder_wasm.cpp.

◆ OJPH_REPEAT4

#define OJPH_REPEAT4 (   a)    a,a,a,a

Definition at line 62 of file ojph_block_decoder_wasm.cpp.

◆ OJPH_REPEAT8

#define OJPH_REPEAT8 (   a)    a,a,a,a,a,a,a,a

Definition at line 63 of file ojph_block_decoder_wasm.cpp.