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/filtbank.c | 406 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 406 insertions(+) create mode 100644 faad2/src/libfaad/filtbank.c (limited to 'faad2/src/libfaad/filtbank.c') diff --git a/faad2/src/libfaad/filtbank.c b/faad2/src/libfaad/filtbank.c new file mode 100644 index 0000000..1d8b6a4 --- /dev/null +++ b/faad2/src/libfaad/filtbank.c @@ -0,0 +1,406 @@ +/* +** 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: filtbank.c,v 1.46 2009/01/26 23:51:15 menno Exp $ +**/ + +#include "common.h" +#include "structs.h" + +#include +#include +#ifdef _WIN32_WCE +#define assert(x) +#else +#include +#endif + +#include "filtbank.h" +#include "syntax.h" +#include "kbd_win.h" +#include "sine_win.h" +#include "mdct.h" + + +fb_info *filter_bank_init(uint16_t frame_len) +{ + uint16_t nshort = frame_len/8; +#ifdef LD_DEC + uint16_t frame_len_ld = frame_len/2; +#endif + + 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); +#ifdef LD_DEC + /* LD */ + fb->mdct1024 = faad_mdct_init(2*frame_len_ld); +#endif + +#ifdef ALLOW_SMALL_FRAMELENGTH + if (frame_len == 1024) + { +#endif + fb->long_window[0] = sine_long_1024; + fb->short_window[0] = sine_short_128; + fb->long_window[1] = kbd_long_1024; + fb->short_window[1] = kbd_short_128; +#ifdef LD_DEC + fb->ld_window[0] = sine_mid_512; + fb->ld_window[1] = ld_mid_512; +#endif +#ifdef ALLOW_SMALL_FRAMELENGTH + } else /* (frame_len == 960) */ { + fb->long_window[0] = sine_long_960; + fb->short_window[0] = sine_short_120; + fb->long_window[1] = kbd_long_960; + fb->short_window[1] = kbd_short_120; +#ifdef LD_DEC + fb->ld_window[0] = sine_mid_480; + fb->ld_window[1] = ld_mid_480; +#endif + } +#endif + + return fb; +} + +void filter_bank_end(fb_info *fb) +{ + if (fb != NULL) + { +#ifdef PROFILE + printf("FB: %I64d cycles\n", fb->cycles); +#endif + + faad_mdct_end(fb->mdct256); + faad_mdct_end(fb->mdct2048); +#ifdef LD_DEC + faad_mdct_end(fb->mdct1024); +#endif + + faad_free(fb); + } +} + +static INLINE void imdct_long(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len) +{ +#ifdef LD_DEC + mdct_info *mdct = NULL; + + switch (len) + { + case 2048: + case 1920: + mdct = fb->mdct2048; + break; + case 1024: + case 960: + mdct = fb->mdct1024; + break; + } + + faad_imdct(mdct, in_data, out_data); +#else + faad_imdct(fb->mdct2048, in_data, out_data); +#endif +} + + +#ifdef LTP_DEC +static INLINE void mdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len) +{ + mdct_info *mdct = NULL; + + switch (len) + { + case 2048: + case 1920: + mdct = fb->mdct2048; + break; + case 256: + case 240: + mdct = fb->mdct256; + break; +#ifdef LD_DEC + case 1024: + case 960: + mdct = fb->mdct1024; + break; +#endif + } + + faad_mdct(mdct, in_data, out_data); +} +#endif + +void 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, real_t *overlap, + uint8_t object_type, uint16_t frame_len) +{ + int16_t i; + ALIGN real_t transf_buf[2*1024] = {0}; + + const real_t *window_long = NULL; + const real_t *window_long_prev = NULL; + const real_t *window_short = NULL; + const real_t *window_short_prev = NULL; + + uint16_t nlong = frame_len; + uint16_t nshort = frame_len/8; + uint16_t trans = nshort/2; + + uint16_t nflat_ls = (nlong-nshort)/2; + +#ifdef PROFILE + int64_t count = faad_get_ts(); +#endif + + /* select windows of current frame and previous frame (Sine or KBD) */ +#ifdef LD_DEC + if (object_type == LD) + { + window_long = fb->ld_window[window_shape]; + window_long_prev = fb->ld_window[window_shape_prev]; + } else { +#endif + 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]; +#ifdef LD_DEC + } +#endif + +#if 0 + for (i = 0; i < 1024; i++) + { + printf("%d\n", freq_in[i]); + } +#endif + +#if 0 + printf("%d %d\n", window_sequence, window_shape); +#endif + + switch (window_sequence) + { + case ONLY_LONG_SEQUENCE: + /* perform iMDCT */ + imdct_long(fb, freq_in, transf_buf, 2*nlong); + + /* add second half output of previous frame to windowed output of current frame */ + for (i = 0; i < nlong; i+=4) + { + time_out[i] = overlap[i] + MUL_F(transf_buf[i],window_long_prev[i]); + time_out[i+1] = overlap[i+1] + MUL_F(transf_buf[i+1],window_long_prev[i+1]); + time_out[i+2] = overlap[i+2] + MUL_F(transf_buf[i+2],window_long_prev[i+2]); + time_out[i+3] = overlap[i+3] + MUL_F(transf_buf[i+3],window_long_prev[i+3]); + } + + /* window the second half and save as overlap for next frame */ + for (i = 0; i < nlong; i+=4) + { + overlap[i] = MUL_F(transf_buf[nlong+i],window_long[nlong-1-i]); + overlap[i+1] = MUL_F(transf_buf[nlong+i+1],window_long[nlong-2-i]); + overlap[i+2] = MUL_F(transf_buf[nlong+i+2],window_long[nlong-3-i]); + overlap[i+3] = MUL_F(transf_buf[nlong+i+3],window_long[nlong-4-i]); + } + break; + + case LONG_START_SEQUENCE: + /* perform iMDCT */ + imdct_long(fb, freq_in, transf_buf, 2*nlong); + + /* add second half output of previous frame to windowed output of current frame */ + for (i = 0; i < nlong; i+=4) + { + time_out[i] = overlap[i] + MUL_F(transf_buf[i],window_long_prev[i]); + time_out[i+1] = overlap[i+1] + MUL_F(transf_buf[i+1],window_long_prev[i+1]); + time_out[i+2] = overlap[i+2] + MUL_F(transf_buf[i+2],window_long_prev[i+2]); + time_out[i+3] = overlap[i+3] + MUL_F(transf_buf[i+3],window_long_prev[i+3]); + } + + /* window the second half and save as overlap for next frame */ + /* construct second half window using padding with 1's and 0's */ + for (i = 0; i < nflat_ls; i++) + overlap[i] = transf_buf[nlong+i]; + for (i = 0; i < nshort; i++) + overlap[nflat_ls+i] = MUL_F(transf_buf[nlong+nflat_ls+i],window_short[nshort-i-1]); + for (i = 0; i < nflat_ls; i++) + overlap[nflat_ls+nshort+i] = 0; + break; + + case EIGHT_SHORT_SEQUENCE: + /* perform iMDCT for each short block */ + faad_imdct(fb->mdct256, freq_in+0*nshort, transf_buf+2*nshort*0); + faad_imdct(fb->mdct256, freq_in+1*nshort, transf_buf+2*nshort*1); + faad_imdct(fb->mdct256, freq_in+2*nshort, transf_buf+2*nshort*2); + faad_imdct(fb->mdct256, freq_in+3*nshort, transf_buf+2*nshort*3); + faad_imdct(fb->mdct256, freq_in+4*nshort, transf_buf+2*nshort*4); + faad_imdct(fb->mdct256, freq_in+5*nshort, transf_buf+2*nshort*5); + faad_imdct(fb->mdct256, freq_in+6*nshort, transf_buf+2*nshort*6); + faad_imdct(fb->mdct256, freq_in+7*nshort, transf_buf+2*nshort*7); + + /* add second half output of previous frame to windowed output of current frame */ + for (i = 0; i < nflat_ls; i++) + time_out[i] = overlap[i]; + for(i = 0; i < nshort; i++) + { + time_out[nflat_ls+ i] = overlap[nflat_ls+ i] + MUL_F(transf_buf[nshort*0+i],window_short_prev[i]); + time_out[nflat_ls+1*nshort+i] = overlap[nflat_ls+nshort*1+i] + MUL_F(transf_buf[nshort*1+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*2+i],window_short[i]); + time_out[nflat_ls+2*nshort+i] = overlap[nflat_ls+nshort*2+i] + MUL_F(transf_buf[nshort*3+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*4+i],window_short[i]); + time_out[nflat_ls+3*nshort+i] = overlap[nflat_ls+nshort*3+i] + MUL_F(transf_buf[nshort*5+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*6+i],window_short[i]); + if (i < trans) + time_out[nflat_ls+4*nshort+i] = overlap[nflat_ls+nshort*4+i] + MUL_F(transf_buf[nshort*7+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*8+i],window_short[i]); + } + + /* window the second half and save as overlap for next frame */ + for(i = 0; i < nshort; i++) + { + if (i >= trans) + overlap[nflat_ls+4*nshort+i-nlong] = MUL_F(transf_buf[nshort*7+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*8+i],window_short[i]); + overlap[nflat_ls+5*nshort+i-nlong] = MUL_F(transf_buf[nshort*9+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*10+i],window_short[i]); + overlap[nflat_ls+6*nshort+i-nlong] = MUL_F(transf_buf[nshort*11+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*12+i],window_short[i]); + overlap[nflat_ls+7*nshort+i-nlong] = MUL_F(transf_buf[nshort*13+i],window_short[nshort-1-i]) + MUL_F(transf_buf[nshort*14+i],window_short[i]); + overlap[nflat_ls+8*nshort+i-nlong] = MUL_F(transf_buf[nshort*15+i],window_short[nshort-1-i]); + } + for (i = 0; i < nflat_ls; i++) + overlap[nflat_ls+nshort+i] = 0; + break; + + case LONG_STOP_SEQUENCE: + /* perform iMDCT */ + imdct_long(fb, freq_in, transf_buf, 2*nlong); + + /* add second half output of previous frame to windowed output of current frame */ + /* construct first half window using padding with 1's and 0's */ + for (i = 0; i < nflat_ls; i++) + time_out[i] = overlap[i]; + for (i = 0; i < nshort; i++) + time_out[nflat_ls+i] = overlap[nflat_ls+i] + MUL_F(transf_buf[nflat_ls+i],window_short_prev[i]); + for (i = 0; i < nflat_ls; i++) + time_out[nflat_ls+nshort+i] = overlap[nflat_ls+nshort+i] + transf_buf[nflat_ls+nshort+i]; + + /* window the second half and save as overlap for next frame */ + for (i = 0; i < nlong; i++) + overlap[i] = MUL_F(transf_buf[nlong+i],window_long[nlong-1-i]); + break; + } + +#if 0 + for (i = 0; i < 1024; i++) + { + printf("%d\n", time_out[i]); + //printf("0x%.8X\n", time_out[i]); + } +#endif + + +#ifdef PROFILE + count = faad_get_ts() - count; + fb->cycles += count; +#endif +} + + +#ifdef LTP_DEC +/* only works for LTP -> no overlapping, no short blocks */ +void filter_bank_ltp(fb_info *fb, uint8_t window_sequence, uint8_t window_shape, + uint8_t window_shape_prev, real_t *in_data, real_t *out_mdct, + uint8_t object_type, uint16_t frame_len) +{ + int16_t i; + ALIGN real_t windowed_buf[2*1024] = {0}; + + const real_t *window_long = NULL; + const real_t *window_long_prev = NULL; + const real_t *window_short = NULL; + const real_t *window_short_prev = NULL; + + uint16_t nlong = frame_len; + uint16_t nshort = frame_len/8; + uint16_t nflat_ls = (nlong-nshort)/2; + + assert(window_sequence != EIGHT_SHORT_SEQUENCE); + +#ifdef LD_DEC + if (object_type == LD) + { + window_long = fb->ld_window[window_shape]; + window_long_prev = fb->ld_window[window_shape_prev]; + } else { +#endif + 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]; +#ifdef LD_DEC + } +#endif + + switch(window_sequence) + { + case ONLY_LONG_SEQUENCE: + for (i = nlong-1; i >= 0; i--) + { + windowed_buf[i] = MUL_F(in_data[i], window_long_prev[i]); + windowed_buf[i+nlong] = MUL_F(in_data[i+nlong], window_long[nlong-1-i]); + } + mdct(fb, windowed_buf, out_mdct, 2*nlong); + break; + + case LONG_START_SEQUENCE: + for (i = 0; i < nlong; i++) + windowed_buf[i] = MUL_F(in_data[i], window_long_prev[i]); + for (i = 0; i < nflat_ls; i++) + windowed_buf[i+nlong] = in_data[i+nlong]; + for (i = 0; i < nshort; i++) + windowed_buf[i+nlong+nflat_ls] = MUL_F(in_data[i+nlong+nflat_ls], window_short[nshort-1-i]); + for (i = 0; i < nflat_ls; i++) + windowed_buf[i+nlong+nflat_ls+nshort] = 0; + mdct(fb, windowed_buf, out_mdct, 2*nlong); + break; + + case LONG_STOP_SEQUENCE: + for (i = 0; i < nflat_ls; i++) + windowed_buf[i] = 0; + for (i = 0; i < nshort; i++) + windowed_buf[i+nflat_ls] = MUL_F(in_data[i+nflat_ls], window_short_prev[i]); + for (i = 0; i < nflat_ls; i++) + windowed_buf[i+nflat_ls+nshort] = in_data[i+nflat_ls+nshort]; + for (i = 0; i < nlong; i++) + windowed_buf[i+nlong] = MUL_F(in_data[i+nlong], window_long[nlong-1-i]); + mdct(fb, windowed_buf, out_mdct, 2*nlong); + break; + } +} +#endif -- cgit v1.2.3