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diff --git a/audio_codec/libfaad/ssr_fb.c b/audio_codec/libfaad/ssr_fb.c new file mode 100644 index 0000000..15e7b92 --- a/dev/null +++ b/audio_codec/libfaad/ssr_fb.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_fb.c,v 1.17 2007/11/01 12:33:36 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*)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 |