ref: 03339bb0a5314887affd3e5b7ececaf3bfa134e4
dir: /libfaad/ssr_ipqf.c/
/* ** FAAD - Freeware Advanced Audio Decoder ** Copyright (C) 2002 M. Bakker ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ** ** $Id: ssr_ipqf.c,v 1.2 2002/12/10 14:53:15 menno Exp $ **/ #include "common.h" #include "structs.h" #ifdef SSR_DEC #include "ssr.h" #include "ssr_ipqf.h" static real_t **app_pqfbuf; static real_t **pp_q0, **pp_t0, **pp_t1; void gc_set_protopqf(real_t *p_proto) { int j; static real_t a_half[48] = { 1.2206911375946939E-05, 1.7261986723798209E-05, 1.2300093657077942E-05, -1.0833943097791965E-05, -5.7772498639901686E-05, -1.2764767618947719E-04, -2.0965186675013334E-04, -2.8166673689263850E-04, -3.1234860429017460E-04, -2.6738519958452353E-04, -1.1949424681824722E-04, 1.3965139412648678E-04, 4.8864136409185725E-04, 8.7044629275148344E-04, 1.1949430269934793E-03, 1.3519708175026700E-03, 1.2346314373964412E-03, 7.6953209114159191E-04, -5.2242432579537141E-05, -1.1516092887213454E-03, -2.3538469841711277E-03, -3.4033123072127277E-03, -4.0028551071986133E-03, -3.8745415659693259E-03, -2.8321073426874310E-03, -8.5038892323704195E-04, 1.8856751185350931E-03, 4.9688741735340923E-03, 7.8056704536795926E-03, 9.7027909685901654E-03, 9.9960423120166159E-03, 8.2019366335594487E-03, 4.1642072876103365E-03, -1.8364453822737758E-03, -9.0384863094167686E-03, -1.6241528177129844E-02, -2.1939551286300665E-02, -2.4533179947088161E-02, -2.2591663337768787E-02, -1.5122066420044672E-02, -1.7971713448186293E-03, 1.6903413428575379E-02, 3.9672315874127042E-02, 6.4487527248102796E-02, 8.8850025474701726E-02, 0.1101132906105560 , 0.1258540205143761 , 0.1342239368467012 }; for (j = 0; j < 48; ++j) { p_proto[j] = p_proto[95-j] = a_half[j]; } } void gc_setcoef_eff_pqfsyn(int mm, int kk, real_t *p_proto, real_t ***ppp_q0, real_t ***ppp_t0, real_t ***ppp_t1) { int i, k, n; real_t w; /* Set 1st Mul&Acc Coef's */ *ppp_q0 = (real_t **) calloc(mm, sizeof(real_t *)); for (n = 0; n < mm; ++n) { (*ppp_q0)[n] = (real_t *) calloc(mm, sizeof(real_t)); } for (n = 0; n < mm/2; ++n) { for (i = 0; i < mm; ++i) { w = (2*i+1)*(2*n+1-mm)*M_PI/(4*mm); (*ppp_q0)[n][i] = 2.0 * cos((real_t) w); w = (2*i+1)*(2*(mm+n)+1-mm)*M_PI/(4*mm); (*ppp_q0)[n + mm/2][i] = 2.0 * cos((real_t) w); } } /* Set 2nd Mul&Acc Coef's */ *ppp_t0 = (real_t **) calloc(mm, sizeof(real_t *)); *ppp_t1 = (real_t **) calloc(mm, sizeof(real_t *)); for (n = 0; n < mm; ++n) { (*ppp_t0)[n] = (real_t *) calloc(kk, sizeof(real_t)); (*ppp_t1)[n] = (real_t *) calloc(kk, sizeof(real_t)); } for (n = 0; n < mm; ++n) { for (k = 0; k < kk; ++k) { (*ppp_t0)[n][k] = mm * p_proto[2*k *mm + n]; (*ppp_t1)[n][k] = mm * p_proto[(2*k+1)*mm + n]; if (k%2 != 0) { (*ppp_t0)[n][k] = -(*ppp_t0)[n][k]; (*ppp_t1)[n][k] = -(*ppp_t1)[n][k]; } } } } void ssr_ipqf(ssr_info *ssr, real_t *in_data, real_t *out_data, real_t buffer[SSR_BANDS][96/4], uint16_t frame_len, uint8_t bands) { static int initFlag = 0; real_t a_pqfproto[PQFTAPS]; int i; if (initFlag == 0) { gc_set_protopqf(a_pqfproto); gc_setcoef_eff_pqfsyn(SSR_BANDS, PQFTAPS/(2*SSR_BANDS), a_pqfproto, &pp_q0, &pp_t0, &pp_t1); initFlag = 1; } for (i = 0; i < frame_len / SSR_BANDS; i++) { int l, n, k; int mm = SSR_BANDS; int kk = PQFTAPS/(2*SSR_BANDS); for (n = 0; n < mm; n++) { for (k = 0; k < 2*kk-1; k++) { buffer[n][k] = buffer[n][k+1]; } } for (n = 0; n < mm; n++) { real_t acc = 0.0; for (l = 0; l < mm; l++) { acc += pp_q0[n][l] * in_data[l*frame_len/SSR_BANDS + i]; } buffer[n][2*kk-1] = acc; } for (n = 0; n < mm/2; n++) { real_t acc = 0.0; for (k = 0; k < kk; k++) { acc += pp_t0[n][k] * buffer[n][2*kk-1-2*k]; } for (k = 0; k < kk; ++k) { acc += pp_t1[n][k] * buffer[n + mm/2][2*kk-2-2*k]; } out_data[i*SSR_BANDS + n] = acc; acc = 0.0; for (k = 0; k < kk; k++) { acc += pp_t0[mm-1-n][k] * buffer[n][2*kk-1-2*k]; } for (k = 0; k < kk; k++) { acc -= pp_t1[mm-1-n][k] * buffer[n + mm/2][2*kk-2-2*k]; } out_data[i*SSR_BANDS + mm-1-n] = acc; } } } #endif