From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/libfaad/ssr_fb.c | 185 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 185 insertions(+) create mode 100644 faad2/src/libfaad/ssr_fb.c (limited to 'faad2/src/libfaad/ssr_fb.c') diff --git a/faad2/src/libfaad/ssr_fb.c b/faad2/src/libfaad/ssr_fb.c new file mode 100644 index 0000000..ebdcf68 --- /dev/null +++ b/faad2/src/libfaad/ssr_fb.c @@ -0,0 +1,185 @@ +/* +** 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_fb.c,v 1.17 2007/11/01 12:33:36 menno Exp $ +**/ + +#include "common.h" +#include "structs.h" + +#ifdef SSR_DEC + +#include +#include +#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*)faad_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) faad_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*)faad_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; + } + + faad_free(transf_buf); +} + + +#endif -- cgit v1.2.3