mirror of
https://github.com/mpv-player/mpv
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73829e43ab
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12626 b3059339-0415-0410-9bf9-f77b7e298cf2
185 lines
6.7 KiB
C
185 lines
6.7 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** Initially modified for use with MPlayer by Arpad Gereöffy on 2003/08/30
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** $Id: ssr_fb.c,v 1.3 2004/06/02 22:59:03 diego Exp $
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** detailed CVS changelog at http://www.mplayerhq.hu/cgi-bin/cvsweb.cgi/main/
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**/
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#include "common.h"
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#include "structs.h"
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#ifdef SSR_DEC
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#include <string.h>
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#include <stdlib.h>
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#include "syntax.h"
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#include "filtbank.h"
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#include "mdct.h"
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#include "ssr_fb.h"
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#include "ssr_win.h"
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fb_info *ssr_filter_bank_init(uint16_t frame_len)
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{
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uint16_t nshort = frame_len/8;
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fb_info *fb = (fb_info*)faad_malloc(sizeof(fb_info));
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memset(fb, 0, sizeof(fb_info));
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/* normal */
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fb->mdct256 = faad_mdct_init(2*nshort);
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fb->mdct2048 = faad_mdct_init(2*frame_len);
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fb->long_window[0] = sine_long_256;
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fb->short_window[0] = sine_short_32;
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fb->long_window[1] = kbd_long_256;
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fb->short_window[1] = kbd_short_32;
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return fb;
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}
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void ssr_filter_bank_end(fb_info *fb)
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{
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faad_mdct_end(fb->mdct256);
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faad_mdct_end(fb->mdct2048);
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if (fb) faad_free(fb);
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}
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static INLINE void imdct_ssr(fb_info *fb, real_t *in_data,
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real_t *out_data, uint16_t len)
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{
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mdct_info *mdct;
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switch (len)
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{
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case 512:
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mdct = fb->mdct2048;
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break;
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case 64:
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mdct = fb->mdct256;
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break;
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}
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faad_imdct(mdct, in_data, out_data);
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}
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/* NON-overlapping inverse filterbank for use with SSR */
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void ssr_ifilter_bank(fb_info *fb, uint8_t window_sequence, uint8_t window_shape,
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uint8_t window_shape_prev, real_t *freq_in,
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real_t *time_out, uint16_t frame_len)
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{
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int16_t i;
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real_t *transf_buf;
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real_t *window_long;
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real_t *window_long_prev;
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real_t *window_short;
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real_t *window_short_prev;
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uint16_t nlong = frame_len;
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uint16_t nshort = frame_len/8;
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uint16_t trans = nshort/2;
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uint16_t nflat_ls = (nlong-nshort)/2;
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transf_buf = (real_t*)faad_malloc(2*nlong*sizeof(real_t));
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window_long = fb->long_window[window_shape];
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window_long_prev = fb->long_window[window_shape_prev];
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window_short = fb->short_window[window_shape];
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window_short_prev = fb->short_window[window_shape_prev];
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switch (window_sequence)
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{
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case ONLY_LONG_SEQUENCE:
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imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
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for (i = nlong-1; i >= 0; i--)
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{
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time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]);
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time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
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}
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break;
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case LONG_START_SEQUENCE:
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imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
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for (i = 0; i < nlong; i++)
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time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]);
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for (i = 0; i < nflat_ls; i++)
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time_out[nlong+i] = transf_buf[nlong+i];
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for (i = 0; i < nshort; i++)
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time_out[nlong+nflat_ls+i] = MUL_R_C(transf_buf[nlong+nflat_ls+i],window_short[nshort-i-1]);
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for (i = 0; i < nflat_ls; i++)
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time_out[nlong+nflat_ls+nshort+i] = 0;
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break;
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case EIGHT_SHORT_SEQUENCE:
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imdct_ssr(fb, freq_in+0*nshort, transf_buf+2*nshort*0, 2*nshort);
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imdct_ssr(fb, freq_in+1*nshort, transf_buf+2*nshort*1, 2*nshort);
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imdct_ssr(fb, freq_in+2*nshort, transf_buf+2*nshort*2, 2*nshort);
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imdct_ssr(fb, freq_in+3*nshort, transf_buf+2*nshort*3, 2*nshort);
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imdct_ssr(fb, freq_in+4*nshort, transf_buf+2*nshort*4, 2*nshort);
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imdct_ssr(fb, freq_in+5*nshort, transf_buf+2*nshort*5, 2*nshort);
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imdct_ssr(fb, freq_in+6*nshort, transf_buf+2*nshort*6, 2*nshort);
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imdct_ssr(fb, freq_in+7*nshort, transf_buf+2*nshort*7, 2*nshort);
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for(i = nshort-1; i >= 0; i--)
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{
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time_out[i+0*nshort] = MUL_R_C(transf_buf[nshort*0+i],window_short_prev[i]);
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time_out[i+1*nshort] = MUL_R_C(transf_buf[nshort*1+i],window_short[i]);
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time_out[i+2*nshort] = MUL_R_C(transf_buf[nshort*2+i],window_short_prev[i]);
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time_out[i+3*nshort] = MUL_R_C(transf_buf[nshort*3+i],window_short[i]);
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time_out[i+4*nshort] = MUL_R_C(transf_buf[nshort*4+i],window_short_prev[i]);
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time_out[i+5*nshort] = MUL_R_C(transf_buf[nshort*5+i],window_short[i]);
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time_out[i+6*nshort] = MUL_R_C(transf_buf[nshort*6+i],window_short_prev[i]);
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time_out[i+7*nshort] = MUL_R_C(transf_buf[nshort*7+i],window_short[i]);
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time_out[i+8*nshort] = MUL_R_C(transf_buf[nshort*8+i],window_short_prev[i]);
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time_out[i+9*nshort] = MUL_R_C(transf_buf[nshort*9+i],window_short[i]);
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time_out[i+10*nshort] = MUL_R_C(transf_buf[nshort*10+i],window_short_prev[i]);
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time_out[i+11*nshort] = MUL_R_C(transf_buf[nshort*11+i],window_short[i]);
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time_out[i+12*nshort] = MUL_R_C(transf_buf[nshort*12+i],window_short_prev[i]);
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time_out[i+13*nshort] = MUL_R_C(transf_buf[nshort*13+i],window_short[i]);
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time_out[i+14*nshort] = MUL_R_C(transf_buf[nshort*14+i],window_short_prev[i]);
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time_out[i+15*nshort] = MUL_R_C(transf_buf[nshort*15+i],window_short[i]);
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}
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break;
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case LONG_STOP_SEQUENCE:
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imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
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for (i = 0; i < nflat_ls; i++)
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time_out[i] = 0;
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for (i = 0; i < nshort; i++)
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time_out[nflat_ls+i] = MUL_R_C(transf_buf[nflat_ls+i],window_short_prev[i]);
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for (i = 0; i < nflat_ls; i++)
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time_out[nflat_ls+nshort+i] = transf_buf[nflat_ls+nshort+i];
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for (i = 0; i < nlong; i++)
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time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
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break;
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}
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faad_free(transf_buf);
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}
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#endif
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