Grok 12.0.1
Classes | Namespaces | Functions
ojph_block_decoder_ssse3.cpp File Reference

implements a faster HTJ2K block decoder using ssse3 More...

#include <string>
#include <iostream>
#include <cassert>
#include <cstring>
#include "grok.h"
#include "Logger.h"
#include "ojph_block_common.h"
#include "ojph_block_decoder.h"
#include "ojph_arch.h"
#include "ojph_message.h"
#include <immintrin.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
 

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.
 
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 __m128i ojph::local::frwd_fetch (frwd_struct *msp)
 Fetches 32 bits from the frwd_struct bitstream.
 
template<int N>
static __m128i ojph::local::decode_one_quad32 (const __m128i inf_u_q, __m128i U_q, frwd_struct *magsgn, ui32 p, __m128i &vn)
 decodes one quad, using 32 bit data
 
static __m128i ojph::local::decode_two_quad16 (const __m128i inf_u_q, __m128i U_q, frwd_struct *magsgn, ui32 p, __m128i &vn)
 decodes twos consecutive quads (one octet), using 16 bit data
 
bool ojph::local::ojph_decode_codeblock_ssse3 (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.
 

Detailed Description

implements a faster HTJ2K block decoder using ssse3