diff options
Diffstat (limited to 'faad2/src/libfaad/ssr_ipqf.c')
| -rw-r--r-- | faad2/src/libfaad/ssr_ipqf.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/faad2/src/libfaad/ssr_ipqf.c b/faad2/src/libfaad/ssr_ipqf.c new file mode 100644 index 0000000..8f061a4 --- /dev/null +++ b/faad2/src/libfaad/ssr_ipqf.c @@ -0,0 +1,191 @@ +/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
+**
+** 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.
+**
+** Any non-GPL usage of this software or parts of this software is strictly
+** forbidden.
+**
+** The "appropriate copyright message" mentioned in section 2c of the GPLv2
+** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
+**
+** $Id: ssr_ipqf.c,v 1.18 2007/11/01 12:33:39 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
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