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tdemultimedia/mpeglib/lib/mpegplay/decoderClass.cpp

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/*
class for decoders
Copyright (C) 1999 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "decoderClass.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef NDEBUG
#define NDEBUG
#endif
#include <assert.h>
#define DEBUG_DECODERCLASS(x)
//#define DEBUG_DECODERCLASS(x) x
/* Array mapping zigzag to array pointer offset. */
static const int zigzag_direct_nommx[64] = {
0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12,
19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35,
42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63};
static const int zigzag_direct_mmx[64] = {
0*8+0/* 0*/, 1*8+0/* 1*/, 0*8+1/* 8*/, 0*8+2/*16*/, 1*8+1/* 9*/, 2*8+0/* 2*/, 3*8+0/* 3*/, 2*8+1/*10*/,
1*8+2/*17*/, 0*8+3/*24*/, 0*8+4/*32*/, 1*8+3/*25*/, 2*8+2/*18*/, 3*8+1/*11*/, 4*8+0/* 4*/, 5*8+0/* 5*/,
4*8+1/*12*/, 5*8+2/*19*/, 2*8+3/*26*/, 1*8+4/*33*/, 0*8+5/*40*/, 0*8+6/*48*/, 1*8+5/*41*/, 2*8+4/*34*/,
3*8+3/*27*/, 4*8+2/*20*/, 5*8+1/*13*/, 6*8+0/* 6*/, 7*8+0/* 7*/, 6*8+1/*14*/, 5*8+2/*21*/, 4*8+3/*28*/,
3*8+4/*35*/, 2*8+5/*42*/, 1*8+6/*49*/, 0*8+7/*56*/, 1*8+7/*57*/, 2*8+6/*50*/, 3*8+5/*43*/, 4*8+4/*36*/,
5*8+3/*29*/, 6*8+2/*22*/, 7*8+1/*15*/, 7*8+2/*23*/, 6*8+3/*30*/, 5*8+4/*37*/, 4*8+5/*44*/, 3*8+6/*51*/,
2*8+7/*58*/, 3*8+7/*59*/, 4*8+6/*52*/, 5*8+5/*45*/, 6*8+4/*38*/, 7*8+3/*31*/, 7*8+4/*39*/, 6*8+5/*46*/,
7*8+6/*53*/, 4*8+7/*60*/, 5*8+7/*61*/, 6*8+6/*54*/, 7*8+5/*47*/, 7*8+6/*55*/, 6*8+7/*62*/, 7*8+7/*63*/
};
/* Bit masks used by bit i/o operations. */
static unsigned int bitMask[] = {0xffffffff,0x7fffffff,0x3fffffff,0x1fffffff,
0x0fffffff, 0x07ffffff, 0x03ffffff, 0x01ffffff,
0x00ffffff, 0x007fffff, 0x003fffff, 0x001fffff,
0x000fffff, 0x0007ffff, 0x0003ffff, 0x0001ffff,
0x0000ffff, 0x00007fff, 0x00003fff, 0x00001fff,
0x00000fff, 0x000007ff, 0x000003ff, 0x000001ff,
0x000000ff, 0x0000007f, 0x0000003f, 0x0000001f,
0x0000000f, 0x00000007, 0x00000003, 0x00000001};
static unsigned int rBitMask[] = {0xffffffff,0xfffffffe,0xfffffffc,0xfffffff8,
0xfffffff0, 0xffffffe0, 0xffffffc0, 0xffffff80,
0xffffff00, 0xfffffe00, 0xfffffc00, 0xfffff800,
0xfffff000, 0xffffe000, 0xffffc000, 0xffff8000,
0xffff0000, 0xfffe0000, 0xfffc0000, 0xfff80000,
0xfff00000, 0xffe00000, 0xffc00000, 0xff800000,
0xff000000, 0xfe000000, 0xfc000000, 0xf8000000,
0xf0000000, 0xe0000000, 0xc0000000, 0x80000000};
static unsigned int bitTest[] = { 0x80000000,0x40000000,0x20000000,0x10000000,
0x08000000, 0x04000000, 0x02000000, 0x01000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000,
0x00080000, 0x00040000, 0x00020000, 0x00010000,
0x00008000, 0x00004000, 0x00002000, 0x00001000,
0x00000800, 0x00000400, 0x00000200, 0x00000100,
0x00000080, 0x00000040, 0x00000020, 0x00000010,
0x00000008, 0x00000004, 0x00000002, 0x00000001};
DecoderClass::DecoderClass(VideoDecoder* vid_stream,
MpegVideoStream* mpegVideoStream) {
this->vid_stream=vid_stream;
this->mpegVideoStream=mpegVideoStream;
#ifdef INTEL
lmmx=mm_support();
#else
lmmx=false;
DEBUG_DECODERCLASS(cout << "no INTEL arch- disable MMX in decoderClass"<<endl;)
#endif
if (lmmx==true) {
lmmx=4;
}
int i;
for(i=0;i<64;i++) {
zigzag_direct[i]=zigzag_direct_nommx[i];
}
if (lmmx) {
for(i=0;i<64;i++) {
// they are different !!!
zigzag_direct[i]=zigzag_direct_mmx[i];
}
}
for(i=64;i<256;i++) {
zigzag_direct[i]=0;
}
resetDCT();
reconptr = dct_recon[0];
}
DecoderClass::~DecoderClass() {
}
int DecoderClass::decodeDCTDCSizeLum() {
unsigned int macro_val;
unsigned int index;
index=mpegVideoStream->showBits(5);
if (index < 31) {
macro_val = dct_dc_size_luminance[index].value;
mpegVideoStream->flushBits(dct_dc_size_luminance[index].num_bits);
} else {
index=mpegVideoStream->showBits(9);
index -= 0x1f0;
macro_val = dct_dc_size_luminance1[index].value;
mpegVideoStream->flushBits(dct_dc_size_luminance1[index].num_bits);
}
return macro_val;
}
int DecoderClass::decodeDCTDCSizeChrom() {
unsigned int macro_val;
unsigned int index;
index=mpegVideoStream->showBits(5);
if (index < 31) {
macro_val = dct_dc_size_chrominance[index].value;
mpegVideoStream->flushBits(dct_dc_size_chrominance[index].num_bits);
}else {
index=mpegVideoStream->showBits(10);
index -= 0x3e0;
macro_val = dct_dc_size_chrominance1[index].value;
mpegVideoStream->flushBits(dct_dc_size_chrominance1[index].num_bits);
}
return macro_val;
}
/*
*--------------------------------------------------------------
*
* DecodeMBAddrInc --
*
* Huffman DecoderClass for macro_block_address_increment; the location
* in which the result will be placed is being passed as argument.
* The decoded value is obtained by doing a table lookup on
* mb_addr_inc.
*
* Results:
* The decoded value for macro_block_address_increment or MPGDECODE_ERROR
* for unbound values will be placed in the location specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
int DecoderClass::decodeMBAddrInc() {
unsigned int index;
int val;
index=mpegVideoStream->showBits(11);
val = mb_addr_inc[index].value;
mpegVideoStream->flushBits(mb_addr_inc[index].num_bits);
if (mb_addr_inc[index].num_bits==0) {
DEBUG_DECODERCLASS(cout<<"num_bits==0"<<endl;)
val=1;
}
if (val == -1) {
DEBUG_DECODERCLASS(cout <<"EROR: decodeMBAddrInc"<<endl;)
val=MB_STUFFING;
}
return val;
}
/*
*--------------------------------------------------------------
*
* DecodeMotionVectors --
*
* Huffman DecoderClass for the various motion vectors, including
* motion_horizontal_forward_code, motion_vertical_forward_code,
* motion_horizontal_backward_code, motion_vertical_backward_code.
* Location where the decoded result will be placed is being passed
* as argument. The decoded values are obtained by doing a table
* lookup on motion_vectors.
*
* Results:
* The decoded value for the motion vector or MPGDECODE_ERROR for unbound
* values will be placed in the location specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
int DecoderClass::decodeMotionVectors() {
unsigned int index;
int value;
index=mpegVideoStream->showBits(11);
value = motion_vectors[index].code;
mpegVideoStream->flushBits(motion_vectors[index].num_bits);
return value;
}
/*
*--------------------------------------------------------------
*
* DecodeCBP --
*
* Huffman DecoderClass for coded_block_pattern; location in which the
* decoded result will be placed is being passed as argument. The
* decoded values are obtained by doing a table lookup on
* coded_block_pattern.
*
* Results:
* The decoded value for coded_block_pattern or MPGDECODE_ERROR for unbound
* values will be placed in the location specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
int DecoderClass::decodeCBP() {
unsigned int index;
unsigned int coded_bp;
index=mpegVideoStream->showBits(9);
coded_bp = coded_block_pattern[index].cbp;
mpegVideoStream->flushBits(coded_block_pattern[index].num_bits);
return coded_bp;
}
/*
*--------------------------------------------------------------
*
* DecodeMBTypeB --
*
* Huffman Decoder for macro_block_type in bidirectionally-coded
* pictures;locations in which the decoded results: macroblock_quant,
* macroblock_motion_forward, macro_block_motion_backward,
* macroblock_pattern, macro_block_intra, will be placed are
* being passed as argument. The decoded values are obtained by
* doing a table lookup on mb_type_B.
*
* Results:
* The various decoded values for macro_block_type in
* bidirectionally-coded pictures or MPGDECODE_ERROR for unbound values will
* be placed in the locations specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
void DecoderClass::decodeMBTypeB(int& quant,int& motion_fwd,
int& motion_bwd,int& pat,int& intra){
unsigned int index;
index=mpegVideoStream->showBits(6);
quant = mb_type_B[index].mb_quant;
motion_fwd = mb_type_B[index].mb_motion_forward;
motion_bwd = mb_type_B[index].mb_motion_backward;
pat = mb_type_B[index].mb_pattern;
intra = mb_type_B[index].mb_intra;
if (index == 0) {
DEBUG_DECODERCLASS(cout << "error in decodeMBTypeB"<<endl;)
}
mpegVideoStream->flushBits(mb_type_B[index].num_bits);
}
/*
*--------------------------------------------------------------
*
* DecodeMBTypeI --
*
* Huffman Decoder for macro_block_type in intra-coded pictures;
* locations in which the decoded results: macroblock_quant,
* macroblock_motion_forward, macro_block_motion_backward,
* macroblock_pattern, macro_block_intra, will be placed are
* being passed as argument.
*
* Results:
* The various decoded values for macro_block_type in intra-coded
* pictures or MPGDECODE_ERROR for unbound values will be placed in the
* locations specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
void DecoderClass::decodeMBTypeI(int& quant,int& motion_fwd,
int& motion_bwd,int& pat,int& intra) {
unsigned int index;
static int quantTbl[4] = {MPGDECODE_ERROR, 1, 0, 0};
index=mpegVideoStream->showBits(2);
motion_fwd = 0;
motion_bwd = 0;
pat = 0;
intra = 1;
quant = quantTbl[index];
if (quant == MPGDECODE_ERROR) {
DEBUG_DECODERCLASS(cout << "decodeMBTypeI Error"<<endl;)
}
if (index) {
mpegVideoStream->flushBits (1 + quant);
}
}
/*
*--------------------------------------------------------------
*
* DecodeMBTypeP --
*
* Huffman Decoder for macro_block_type in predictive-coded pictures;
* locations in which the decoded results: macroblock_quant,
* macroblock_motion_forward, macro_block_motion_backward,
* macroblock_pattern, macro_block_intra, will be placed are
* being passed as argument. The decoded values are obtained by
* doing a table lookup on mb_type_P.
*
* Results:
* The various decoded values for macro_block_type in
* predictive-coded pictures or MPGDECODE_ERROR for unbound values will be
* placed in the locations specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
void DecoderClass::decodeMBTypeP(int& quant,int& motion_fwd,
int& motion_bwd,int& pat,int& intra) {
unsigned int index;
index=mpegVideoStream->showBits(6);
quant = mb_type_P[index].mb_quant;
motion_fwd = mb_type_P[index].mb_motion_forward;
motion_bwd = mb_type_P[index].mb_motion_backward;
pat = mb_type_P[index].mb_pattern;
intra = mb_type_P[index].mb_intra;
if (index == 0) {
DEBUG_DECODERCLASS(cout << "error in decodeMBTypeP"<<endl;)
}
mpegVideoStream->flushBits(mb_type_P[index].num_bits);
}
/*
*--------------------------------------------------------------
*
* decodeDCTCoeff --
*
* Huffman Decoder for dct_coeff_first and dct_coeff_next;
* locations where the results of decoding: run and level, are to
* be placed and also the type of DCT coefficients, either
* dct_coeff_first or dct_coeff_next, are being passed as argument.
*
* The decoder first examines the next 8 bits in the input stream,
* and perform according to the following cases:
*
* '0000 0000' - examine 8 more bits (i.e. 16 bits total) and
* perform a table lookup on dct_coeff_tbl_0.
* One more bit is then examined to determine the sign
* of level.
*
* '0000 0001' - examine 4 more bits (i.e. 12 bits total) and
* perform a table lookup on dct_coeff_tbl_1.
* One more bit is then examined to determine the sign
* of level.
*
* '0000 0010' - examine 2 more bits (i.e. 10 bits total) and
* perform a table lookup on dct_coeff_tbl_2.
* One more bit is then examined to determine the sign
* of level.
*
* '0000 0011' - examine 2 more bits (i.e. 10 bits total) and
* perform a table lookup on dct_coeff_tbl_3.
* One more bit is then examined to determine the sign
* of level.
*
* otherwise - perform a table lookup on dct_coeff_tbl. If the
* value of run is not ESCAPE, extract one more bit
* to determine the sign of level; otherwise 6 more
* bits will be extracted to obtain the actual value
* of run , and then 8 or 16 bits to get the value of level.
*
*
*
* Results:
* The decoded values of run and level or MPGDECODE_ERROR
* for unbound values
* are placed in the locations specified.
*
* Side effects:
* Bit stream is irreversibly parsed.
*
*--------------------------------------------------------------
*/
void DecoderClass::decodeDCTCoeff(unsigned short int* dct_coeff_tbl,
unsigned RUNTYPE& run,int& level) {
unsigned int temp, index;
unsigned int value, next32bits, flushed;
/*
* Grab the next 32 bits and use it to improve performance of
* getting the bits to parse. Thus, calls are translated as:
*
* show_bitsX <--> next32bits >> (32-X)
* get_bitsX <--> val = next32bits >> (32-flushed-X);
* flushed += X;
* next32bits &= bitMask[flushed];
* flush_bitsX <--> flushed += X;
* next32bits &= bitMask[flushed];
*
*/
next32bits=mpegVideoStream->showBits32();
flushed = 0;
/* show_bits8(index); */
index = next32bits >> 24;
if (index > 3) {
value = dct_coeff_tbl[index];
run = (value & RUN_MASK) >> RUN_SHIFT;
if (run == END_OF_BLOCK) {
level = END_OF_BLOCK;
}
else {
/* num_bits = (value & NUM_MASK) + 1; */
/* flush_bits(num_bits); */
flushed = (value & NUM_MASK) + 1;
next32bits &= bitMask[flushed];
if (run != ESCAPE) {
level = (value & LEVEL_MASK) >> LEVEL_SHIFT;
/* get_bits1(value); */
/* if (value) *level = -*level; */
if (next32bits >> (31-flushed)) level = -level;
flushed++;
/* next32bits &= bitMask[flushed]; last op before update */
}
else { /* *run == ESCAPE */
/* get_bits14(temp); */
temp = next32bits >> (18-flushed);
flushed += 14;
next32bits &= bitMask[flushed];
run = temp >> 8;
temp &= 0xff;
if (temp == 0) {
/* get_bits8(*level); */
level = next32bits >> (24-flushed);
flushed += 8;
/* next32bits &= bitMask[flushed]; last op before update */
assert(level >= 128);
} else if (temp != 128) {
/* Grab sign bit */
level = ((int) (temp << 24)) >> 24;
} else {
/* get_bits8(*level); */
level = next32bits >> (24-flushed);
flushed += 8;
/* next32bits &= bitMask[flushed]; last op before update */
level = level - 256;
assert(level <= -128 && level >= -255);
}
}
/* Update bitstream... */
mpegVideoStream->flushBitsDirect(flushed);
}
}
else {
if (index == 2) {
/* show_bits10(index); */
index = next32bits >> 22;
value = dct_coeff_tbl_2[index & 3];
}
else if (index == 3) {
/* show_bits10(index); */
index = next32bits >> 22;
value = dct_coeff_tbl_3[index & 3];
}
else if (index) { /* index == 1 */
/* show_bits12(index); */
index = next32bits >> 20;
value = dct_coeff_tbl_1[index & 15];
}
else { /* index == 0 */
/* show_bits16(index); */
index = next32bits >> 16;
value = dct_coeff_tbl_0[index & 255];
}
run = (value & RUN_MASK) >> RUN_SHIFT;
level = (value & LEVEL_MASK) >> LEVEL_SHIFT;
/*
* Fold these operations together to make it fast...
*/
/* num_bits = (value & NUM_MASK) + 1; */
/* flush_bits(num_bits); */
/* get_bits1(value); */
/* if (value) *level = -*level; */
flushed = (value & NUM_MASK) + 2;
if ((next32bits >> (32-flushed)) & 0x1) level = -level;
/* Update bitstream ... */
mpegVideoStream->flushBitsDirect(flushed);
}
}
void DecoderClass::resetDCT() {
/* Reset past dct dc y, cr, and cb values. */
dct_dc_y_past = 1024 << 3;
dct_dc_cr_past = 1024 << 3;
dct_dc_cb_past = 1024 << 3;
}
/*
*--------------------------------------------------------------
*
* ParseReconBlock --
*
* Parse values for block structure from bitstream.
* n is an indication of the position of the block within
* the macroblock (i.e. 0-5) and indicates the type of
* block (i.e. luminance or chrominance). Reconstructs
* coefficients from values parsed and puts in
* block.dct_recon array in vid stream structure.
* sparseFlag is set when the block contains only one
* coeffictient and is used by the IDCT.
*
* Results:
*
*
* Side effects:
* Bit stream irreversibly parsed.
*
*--------------------------------------------------------------
*/
void DecoderClass::ParseReconBlock(int& n,int& mb_intra,
unsigned int& qscale,
int& lflag,
unsigned int* iqmatrixptr,
unsigned int* niqmatrixptr) {
int coeffCount=0;
if (mpegVideoStream->hasBytes(512) == false) {
DEBUG_DECODERCLASS(cout << "cannot get 512 raw bytes"<<endl;)
return;
}
{
/*
* Copy the VideoDecoder fields curBits, bitOffset, and bitBuffer
* into local variables with the same names, so the macros use the
* local variables instead. This allows register allocation and
* can provide 1-2 fps speedup. On machines with not so many registers,
* don't do this.
*/
int size, pos, coeff;
int level;
unsigned RUNTYPE run;
unsigned RUNTYPE i;
memset((char *) dct_recon, 0, 64*sizeof(short int));
if (mb_intra) {
if (n < 4) {
/*
* Get the luminance bits. This code has been hand optimized to
* get by the normal bit parsing routines. We get some speedup
* by grabbing the next 16 bits and parsing things locally.
* Thus, calls are translated as:
*
* show_bitsX <--> next16bits >> (16-X)
* get_bitsX <--> val = next16bits >> (16-flushed-X);
* flushed += X;
* next16bits &= bitMask[flushed];
* flush_bitsX <--> flushed += X;
* next16bits &= bitMask[flushed];
*
* I've streamlined the code a lot, so that we don't have to mask
* out the low order bits and a few of the extra adds are removed.
* bsmith
*/
unsigned int next16bits, index, flushed;
next16bits=mpegVideoStream->showBits16();
index = next16bits >> (16-5);
if (index < 31) {
size = dct_dc_size_luminance[index].value;
flushed = dct_dc_size_luminance[index].num_bits;
} else {
index = next16bits >> (16-9);
index -= 0x1f0;
size = dct_dc_size_luminance1[index].value;
flushed = dct_dc_size_luminance1[index].num_bits;
}
next16bits &= bitMask[(16+flushed)&0x1f];
if (size != 0) {
flushed += size;
coeff = next16bits >> (16-flushed);
if (!(coeff & bitTest[32-size])) {
coeff++;
coeff|= rBitMask[size&0x1f];
}
coeff <<= 3;
} else {
coeff = 0;
}
mpegVideoStream->flushBitsDirect(flushed);
if ( (n == 0) && (lflag) ) {
coeff += 1024;
} else {
coeff += dct_dc_y_past;
}
dct_dc_y_past = coeff;
} else { /* n = 4 or 5 */
/*
* Get the chrominance bits. This code has been hand optimized to
* as described above
*/
unsigned int next16bits, index, flushed;
next16bits=mpegVideoStream->showBits16();
index = next16bits >> (16-5);
if (index < 31) {
size = dct_dc_size_chrominance[index].value;
flushed = dct_dc_size_chrominance[index].num_bits;
} else {
index = next16bits >> (16-10);
index -= 0x3e0;
size = dct_dc_size_chrominance1[index].value;
flushed = dct_dc_size_chrominance1[index].num_bits;
}
next16bits &= bitMask[(16+flushed)&0x1f];
if (size != 0) {
flushed += size;
coeff = next16bits >> (16-flushed);
if (!(coeff & bitTest[32-size])) {
coeff++;
coeff|=rBitMask[size&0x1f];
}
coeff <<= 3;
} else {
coeff = 0;
}
mpegVideoStream->flushBitsDirect(flushed);
/* We test 5 first; a result of the mixup of Cr and Cb */
if (n == 5) {
if (lflag) {
coeff += 1024;
} else {
coeff += dct_dc_cr_past;
}
dct_dc_cr_past = coeff;
} else {
if (lflag) {
coeff += 1024;
} else {
coeff += dct_dc_cb_past;
}
dct_dc_cb_past = coeff;
}
}
coeff <<= lmmx;
reconptr[0] = coeff;
pos=0;
i = 0;
coeffCount = (coeff != 0);
// we never have d_types so there is no check
while(1) {
decodeDCTCoeff(dct_coeff_next,run,level);
if (run >=END_OF_BLOCK) {
break;
}
i++;
i+=run;
pos = zigzag_direct[i&0x3f];
coeff = (level * qscale * iqmatrixptr[pos]) >> 3 ;
if (level < 0) {
coeff += (1 - (coeff & 1));
} else {
coeff -= (1 - (coeff & 1));
}
coeff <<= lmmx;
reconptr[pos] = coeff;
coeffCount++;
}
mpegVideoStream->flushBitsDirect(2);
goto end;
} else { /* non-intra-coded macroblock */
decodeDCTCoeff(dct_coeff_first,run,level);
i = run;
pos = zigzag_direct[i&0x3f];
/* quantizes and oddifies each coefficient */
if (level < 0) {
coeff = ((level - 1) * qscale * niqmatrixptr[pos]) >>3;
if ((coeff & 1) == 0) {coeff++;}
} else {
coeff = ((level + 1) * qscale * niqmatrixptr[pos]) >>3;
coeff = (coeff-1) | 1;
}
coeff <<= lmmx;
reconptr[pos] = coeff;
coeffCount = (coeff!=0);
// we never have d_type pictures here, we do not support them
while(1) {
decodeDCTCoeff(dct_coeff_next,run,level);
if (run >= END_OF_BLOCK) {
break;
}
i++;
i+=run;
pos = zigzag_direct[i&0x3f];
if (level < 0) {
coeff = ((level - 1) * qscale * niqmatrixptr[pos]) >>3;
if ((coeff & 1) == 0) {coeff++;}
} else {
coeff = ((level + 1) * qscale * niqmatrixptr[pos]) >> 3;
coeff = (coeff-1) | 1;
}
coeff <<= lmmx;
reconptr[pos] = coeff;
coeffCount++;
} /* end while */
mpegVideoStream->flushBitsDirect(2);
goto end;
}
end:
if (coeffCount == 1) {
if (lmmx) {
emms();
reconptr[pos]>>=lmmx;
j_rev_dct_sparse (reconptr, pos);
//IDCT_mmx(reconptr);
} else {
j_rev_dct_sparse (reconptr, pos);
}
} else {
if (lmmx) {
IDCT_mmx(reconptr);
} else {
j_rev_dct(reconptr);
}
}
}
// we call this at the edn of the "critical sections"
/*
if (lmmx) {
emms();
}
*/
return;
}
void DecoderClass::print() {
int i;
for(i=0;i<64;i++) {
printf(" %d ",zigzag_direct[i]);
}
printf("\n");
}
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