forked from KolibriOS/kolibrios
218 lines
5.5 KiB
C
218 lines
5.5 KiB
C
#include "layer3.h"
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#include <math.h>
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#include <string.h> //memmove
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extern SIDE_INFO m_side_info;
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extern SCALE_FACTOR m_scale_fac[2][2]; // [gr][ch]
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extern CB_INFO m_cb_info[2][2]; // [gr][ch]
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extern int m_nsamp[2][2];
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extern int m_nBand[2][22];
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extern int m_ncbl_mixed;
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#define GLOBAL_GAIN_SCALE (4*15)
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static const int pretab[2][22] =
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{
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
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{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0},
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};
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/* 8 bit plus 2 lookup x = pow(2.0, 0.25*(global_gain-210)) */
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/* two extra slots to do 1/sqrt(2) scaling for ms */
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/* 4 extra slots to do 1/2 scaling for cvt to mono */
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static float look_global[256 + 2 + 4];
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/*-------- scaling lookup
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x = pow(2.0, -0.5*(1+scalefact_scale)*scalefac + preemp)
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look_scale[scalefact_scale][preemp][scalefac]
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-----------------------*/
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static float look_scale[2][4][32];
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/*--- iSample**(4/3) lookup, -32<=i<=31 ---*/
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#define ISMAX 32
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static float look_pow[2 * ISMAX];
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/*-- pow(2.0, -0.25*8.0*subblock_gain) --*/
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static float look_subblock[8];
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/*-- reorder buffer ---*/
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static float re_buf[192][3];
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typedef float ARRAY3[3];
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void quant_init()
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{
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int i;
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int scalefact_scale, preemp, scalefac;
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double tmp;
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/* 8 bit plus 2 lookup x = pow(2.0, 0.25*(global_gain-210)) */
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/* extra 2 for ms scaling by 1/sqrt(2) */
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/* extra 4 for cvt to mono scaling by 1/2 */
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for (i = 0; i < 256 + 2 + 4; i++)
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look_global[i] = (float) pow_test(2.0, 0.25 * ((i - (2 + 4)) - 210 + GLOBAL_GAIN_SCALE));
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/* x = pow(2.0, -0.5*(1+scalefact_scale)*scalefac + preemp) */
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for (scalefact_scale = 0; scalefact_scale < 2; scalefact_scale++)
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{
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for (preemp = 0; preemp < 4; preemp++)
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{
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for (scalefac = 0; scalefac < 32; scalefac++)
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{
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look_scale[scalefact_scale][preemp][scalefac] =
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(float) pow_test(2.0, -0.5 * (1 + scalefact_scale) * (scalefac + preemp));
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}
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}
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}
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/*--- iSample**(4/3) lookup, -32<=i<=31 ---*/
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for (i = 0; i < 64; i++)
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{
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tmp = i - 32;
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look_pow[i] = (float) (tmp * pow_test(fabs(tmp), (1.0 / 3.0)));
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}
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/*-- pow(2.0, -0.25*8.0*subblock_gain) 3 bits --*/
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for (i = 0; i < 8; i++)
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{
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look_subblock[i] = (float) pow_test(2.0, 0.25 * -8.0 * i);
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}
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// quant_init_sf_band(sr_index); replaced by code in sup.c
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}
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void dequant(SAMPLE Sample[], int gr, int ch)
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{
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SCALE_FACTOR* sf = &m_scale_fac[gr][ch];
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GR_INFO* gr_info = &m_side_info.gr[gr][ch];
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CB_INFO* cb_info = &m_cb_info[gr][ch];
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int* nsamp = &m_nsamp[gr][ch];
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int i, j;
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int cb, n, w;
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float x0, xs;
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float xsb[3];
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double tmp;
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int ncbl;
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int cbs0;
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ARRAY3 *buf; /* short block reorder */
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int nbands;
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int i0;
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int non_zero;
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int cbmax[3];
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nbands = *nsamp;
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ncbl = 22; /* long block cb end */
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cbs0 = 12; /* short block cb start */
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/* ncbl_mixed = 8 or 6 mpeg1 or 2 */
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if (gr_info->block_type == 2)
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{
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ncbl = 0;
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cbs0 = 0;
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if (gr_info->mixed_block_flag)
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{
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ncbl = m_ncbl_mixed;
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cbs0 = 3;
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}
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}
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/* fill in cb_info -- */
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cb_info->lb_type = gr_info->block_type;
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if (gr_info->block_type == 2)
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cb_info->lb_type;
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cb_info->cbs0 = cbs0;
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cb_info->ncbl = ncbl;
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cbmax[2] = cbmax[1] = cbmax[0] = 0;
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/* global gain pre-adjusted by 2 if ms_mode, 0 otherwise */
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x0 = look_global[(2 + 4) + gr_info->global_gain];
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i = 0;
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/*----- long blocks ---*/
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for (cb = 0; cb < ncbl; cb++)
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{
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non_zero = 0;
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xs = x0 * look_scale[gr_info->scalefac_scale][pretab[gr_info->preflag][cb]][sf->l[cb]];
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n = m_nBand[0][cb];
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for (j = 0; j < n; j++, i++)
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{
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if (Sample[i].s == 0)
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Sample[i].x = 0.0F;
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else
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{
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non_zero = 1;
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if ((Sample[i].s >= (-ISMAX)) && (Sample[i].s < ISMAX))
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Sample[i].x = xs * look_pow[ISMAX + Sample[i].s];
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else
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{
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tmp = (double) Sample[i].s;
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Sample[i].x = (float) (xs * tmp * pow_test(fabs(tmp), (1.0 / 3.0)));
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}
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}
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}
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if (non_zero)
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cbmax[0] = cb;
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if (i >= nbands)
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break;
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}
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cb_info->cbmax = cbmax[0];
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cb_info->cbtype = 0; // type = long
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if (cbs0 >= 12)
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return;
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/*---------------------------
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block type = 2 short blocks
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----------------------------*/
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cbmax[2] = cbmax[1] = cbmax[0] = cbs0;
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i0 = i; /* save for reorder */
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buf = re_buf;
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for (w = 0; w < 3; w++)
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xsb[w] = x0 * look_subblock[gr_info->subblock_gain[w]];
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for (cb = cbs0; cb < 13; cb++)
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{
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n = m_nBand[1][cb];
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for (w = 0; w < 3; w++)
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{
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non_zero = 0;
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xs = xsb[w] * look_scale[gr_info->scalefac_scale][0][sf->s[w][cb]];
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for (j = 0; j < n; j++, i++)
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{
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if (Sample[i].s == 0)
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buf[j][w] = 0.0F;
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else
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{
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non_zero = 1;
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if ((Sample[i].s >= (-ISMAX)) && (Sample[i].s < ISMAX))
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buf[j][w] = xs * look_pow[ISMAX + Sample[i].s];
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else
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{
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tmp = (double) Sample[i].s;
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buf[j][w] = (float) (xs * tmp * pow_test(fabs(tmp), (1.0 / 3.0)));
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}
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}
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}
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if (non_zero)
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cbmax[w] = cb;
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}
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if (i >= nbands)
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break;
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buf += n;
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}
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memmove(&Sample[i0].x, &re_buf[0][0], sizeof(float) * (i - i0));
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*nsamp = i; /* update nsamp */
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cb_info->cbmax_s[0] = cbmax[0];
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cb_info->cbmax_s[1] = cbmax[1];
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cb_info->cbmax_s[2] = cbmax[2];
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if (cbmax[1] > cbmax[0])
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cbmax[0] = cbmax[1];
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if (cbmax[2] > cbmax[0])
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cbmax[0] = cbmax[2];
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cb_info->cbmax = cbmax[0];
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cb_info->cbtype = 1; /* type = short */
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}
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