ref: 4cebe678d736d6bf846d8d80e8243a3efa48e090
dir: /libfaad/ssr_fb.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_fb.c,v 1.1 2002/11/28 18:48:30 menno Exp $ **/ #include "common.h" #include "structs.h" #ifdef SSR_DEC #include <string.h> #include <stdlib.h> #include "syntax.h" #include "filtbank.h" #include "mdct.h" #include "ssr_fb.h" #include "ssr_win.h" fb_info *ssr_filter_bank_init(uint16_t frame_len) { uint16_t nshort = frame_len/8; fb_info *fb = (fb_info*)malloc(sizeof(fb_info)); memset(fb, 0, sizeof(fb_info)); /* normal */ fb->mdct256 = faad_mdct_init(2*nshort); fb->mdct2048 = faad_mdct_init(2*frame_len); fb->long_window[0] = sine_long_256; fb->short_window[0] = sine_short_32; fb->long_window[1] = kbd_long_256; fb->short_window[1] = kbd_short_32; return fb; } void ssr_filter_bank_end(fb_info *fb) { faad_mdct_end(fb->mdct256); faad_mdct_end(fb->mdct2048); if (fb) free(fb); } static INLINE void imdct_ssr(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len) { mdct_info *mdct; switch (len) { case 512: mdct = fb->mdct2048; break; case 64: mdct = fb->mdct256; break; } faad_imdct(mdct, in_data, out_data); } /* NON-overlapping inverse filterbank for use with SSR */ void ssr_ifilter_bank(fb_info *fb, uint8_t window_sequence, uint8_t window_shape, uint8_t window_shape_prev, real_t *freq_in, real_t *time_out, uint16_t frame_len) { int16_t i; real_t *transf_buf; real_t *window_long; real_t *window_long_prev; real_t *window_short; real_t *window_short_prev; uint16_t nlong = frame_len; uint16_t nshort = frame_len/8; uint16_t trans = nshort/2; uint16_t nflat_ls = (nlong-nshort)/2; transf_buf = (real_t*)malloc(2*nlong*sizeof(real_t)); window_long = fb->long_window[window_shape]; window_long_prev = fb->long_window[window_shape_prev]; window_short = fb->short_window[window_shape]; window_short_prev = fb->short_window[window_shape_prev]; switch (window_sequence) { case ONLY_LONG_SEQUENCE: imdct_ssr(fb, freq_in, transf_buf, 2*nlong); for (i = nlong-1; i >= 0; i--) { time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]); time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]); } break; case LONG_START_SEQUENCE: imdct_ssr(fb, freq_in, transf_buf, 2*nlong); for (i = 0; i < nlong; i++) time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]); for (i = 0; i < nflat_ls; i++) time_out[nlong+i] = transf_buf[nlong+i]; for (i = 0; i < nshort; i++) time_out[nlong+nflat_ls+i] = MUL_R_C(transf_buf[nlong+nflat_ls+i],window_short[nshort-i-1]); for (i = 0; i < nflat_ls; i++) time_out[nlong+nflat_ls+nshort+i] = 0; break; case EIGHT_SHORT_SEQUENCE: imdct_ssr(fb, freq_in+0*nshort, transf_buf+2*nshort*0, 2*nshort); imdct_ssr(fb, freq_in+1*nshort, transf_buf+2*nshort*1, 2*nshort); imdct_ssr(fb, freq_in+2*nshort, transf_buf+2*nshort*2, 2*nshort); imdct_ssr(fb, freq_in+3*nshort, transf_buf+2*nshort*3, 2*nshort); imdct_ssr(fb, freq_in+4*nshort, transf_buf+2*nshort*4, 2*nshort); imdct_ssr(fb, freq_in+5*nshort, transf_buf+2*nshort*5, 2*nshort); imdct_ssr(fb, freq_in+6*nshort, transf_buf+2*nshort*6, 2*nshort); imdct_ssr(fb, freq_in+7*nshort, transf_buf+2*nshort*7, 2*nshort); for(i = nshort-1; i >= 0; i--) { time_out[i+0*nshort] = MUL_R_C(transf_buf[nshort*0+i],window_short_prev[i]); time_out[i+1*nshort] = MUL_R_C(transf_buf[nshort*1+i],window_short[i]); time_out[i+2*nshort] = MUL_R_C(transf_buf[nshort*2+i],window_short_prev[i]); time_out[i+3*nshort] = MUL_R_C(transf_buf[nshort*3+i],window_short[i]); time_out[i+4*nshort] = MUL_R_C(transf_buf[nshort*4+i],window_short_prev[i]); time_out[i+5*nshort] = MUL_R_C(transf_buf[nshort*5+i],window_short[i]); time_out[i+6*nshort] = MUL_R_C(transf_buf[nshort*6+i],window_short_prev[i]); time_out[i+7*nshort] = MUL_R_C(transf_buf[nshort*7+i],window_short[i]); time_out[i+8*nshort] = MUL_R_C(transf_buf[nshort*8+i],window_short_prev[i]); time_out[i+9*nshort] = MUL_R_C(transf_buf[nshort*9+i],window_short[i]); time_out[i+10*nshort] = MUL_R_C(transf_buf[nshort*10+i],window_short_prev[i]); time_out[i+11*nshort] = MUL_R_C(transf_buf[nshort*11+i],window_short[i]); time_out[i+12*nshort] = MUL_R_C(transf_buf[nshort*12+i],window_short_prev[i]); time_out[i+13*nshort] = MUL_R_C(transf_buf[nshort*13+i],window_short[i]); time_out[i+14*nshort] = MUL_R_C(transf_buf[nshort*14+i],window_short_prev[i]); time_out[i+15*nshort] = MUL_R_C(transf_buf[nshort*15+i],window_short[i]); } break; case LONG_STOP_SEQUENCE: imdct_ssr(fb, freq_in, transf_buf, 2*nlong); for (i = 0; i < nflat_ls; i++) time_out[i] = 0; for (i = 0; i < nshort; i++) time_out[nflat_ls+i] = MUL_R_C(transf_buf[nflat_ls+i],window_short_prev[i]); for (i = 0; i < nflat_ls; i++) time_out[nflat_ls+nshort+i] = transf_buf[nflat_ls+nshort+i]; for (i = 0; i < nlong; i++) time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]); break; } free(transf_buf); } #endif