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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@29306 b3059339-0415-0410-9bf9-f77b7e298cf2
405 lines
13 KiB
C
405 lines
13 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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** $Id: filtbank.c,v 1.41 2004/09/08 09:43:11 gcp Exp $
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**/
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#include "common.h"
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#include "structs.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32_WCE
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#define assert(x)
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#else
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#include <assert.h>
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#endif
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#include "filtbank.h"
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#include "decoder.h"
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#include "syntax.h"
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#include "kbd_win.h"
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#include "sine_win.h"
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#include "mdct.h"
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fb_info *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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#ifdef LD_DEC
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uint16_t frame_len_ld = frame_len/2;
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#endif
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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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#ifdef LD_DEC
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/* LD */
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fb->mdct1024 = faad_mdct_init(2*frame_len_ld);
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#endif
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#ifdef ALLOW_SMALL_FRAMELENGTH
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if (frame_len == 1024)
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{
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#endif
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fb->long_window[0] = sine_long_1024;
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fb->short_window[0] = sine_short_128;
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fb->long_window[1] = kbd_long_1024;
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fb->short_window[1] = kbd_short_128;
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#ifdef LD_DEC
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fb->ld_window[0] = sine_mid_512;
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fb->ld_window[1] = ld_mid_512;
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#endif
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#ifdef ALLOW_SMALL_FRAMELENGTH
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} else /* (frame_len == 960) */ {
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fb->long_window[0] = sine_long_960;
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fb->short_window[0] = sine_short_120;
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fb->long_window[1] = kbd_long_960;
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fb->short_window[1] = kbd_short_120;
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#ifdef LD_DEC
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fb->ld_window[0] = sine_mid_480;
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fb->ld_window[1] = ld_mid_480;
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#endif
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}
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#endif
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return fb;
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}
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void filter_bank_end(fb_info *fb)
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{
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if (fb != NULL)
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{
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#ifdef PROFILE
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printf("FB: %I64d cycles\n", fb->cycles);
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#endif
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faad_mdct_end(fb->mdct256);
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faad_mdct_end(fb->mdct2048);
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#ifdef LD_DEC
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faad_mdct_end(fb->mdct1024);
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#endif
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faad_free(fb);
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}
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}
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static INLINE void imdct_long(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
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{
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#ifdef LD_DEC
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mdct_info *mdct = NULL;
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switch (len)
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{
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case 2048:
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case 1920:
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mdct = fb->mdct2048;
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break;
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case 1024:
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case 960:
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mdct = fb->mdct1024;
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break;
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}
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faad_imdct(mdct, in_data, out_data);
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#else
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faad_imdct(fb->mdct2048, in_data, out_data);
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#endif
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}
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#ifdef LTP_DEC
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static INLINE void mdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
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{
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mdct_info *mdct = NULL;
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switch (len)
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{
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case 2048:
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case 1920:
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mdct = fb->mdct2048;
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break;
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case 256:
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case 240:
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mdct = fb->mdct256;
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break;
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#ifdef LD_DEC
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case 1024:
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case 960:
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mdct = fb->mdct1024;
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break;
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#endif
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}
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faad_mdct(mdct, in_data, out_data);
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}
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#endif
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void 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, real_t *overlap,
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uint8_t object_type, uint16_t frame_len)
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{
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int16_t i;
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ALIGN real_t transf_buf[2*1024] = {0};
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const real_t *window_long = NULL;
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const real_t *window_long_prev = NULL;
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const real_t *window_short = NULL;
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const real_t *window_short_prev = NULL;
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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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#ifdef PROFILE
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int64_t count = faad_get_ts();
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#endif
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/* select windows of current frame and previous frame (Sine or KBD) */
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#ifdef LD_DEC
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if (object_type == LD)
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{
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window_long = fb->ld_window[window_shape];
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window_long_prev = fb->ld_window[window_shape_prev];
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} else {
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#endif
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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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#ifdef LD_DEC
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}
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#endif
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#if 0
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for (i = 0; i < 1024; i++)
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{
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printf("%d\n", freq_in[i]);
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}
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#endif
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#if 0
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printf("%d %d\n", window_sequence, window_shape);
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#endif
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switch (window_sequence)
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{
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case ONLY_LONG_SEQUENCE:
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/* perform iMDCT */
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imdct_long(fb, freq_in, transf_buf, 2*nlong);
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/* add second half output of previous frame to windowed output of current frame */
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for (i = 0; i < nlong; i+=4)
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{
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time_out[i] = overlap[i] + MUL_F(transf_buf[i],window_long_prev[i]);
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time_out[i+1] = overlap[i+1] + MUL_F(transf_buf[i+1],window_long_prev[i+1]);
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time_out[i+2] = overlap[i+2] + MUL_F(transf_buf[i+2],window_long_prev[i+2]);
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time_out[i+3] = overlap[i+3] + MUL_F(transf_buf[i+3],window_long_prev[i+3]);
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}
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/* window the second half and save as overlap for next frame */
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for (i = 0; i < nlong; i+=4)
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{
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overlap[i] = MUL_F(transf_buf[nlong+i],window_long[nlong-1-i]);
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overlap[i+1] = MUL_F(transf_buf[nlong+i+1],window_long[nlong-2-i]);
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overlap[i+2] = MUL_F(transf_buf[nlong+i+2],window_long[nlong-3-i]);
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overlap[i+3] = MUL_F(transf_buf[nlong+i+3],window_long[nlong-4-i]);
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}
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break;
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case LONG_START_SEQUENCE:
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/* perform iMDCT */
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imdct_long(fb, freq_in, transf_buf, 2*nlong);
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/* add second half output of previous frame to windowed output of current frame */
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for (i = 0; i < nlong; i+=4)
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{
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time_out[i] = overlap[i] + MUL_F(transf_buf[i],window_long_prev[i]);
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time_out[i+1] = overlap[i+1] + MUL_F(transf_buf[i+1],window_long_prev[i+1]);
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time_out[i+2] = overlap[i+2] + MUL_F(transf_buf[i+2],window_long_prev[i+2]);
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time_out[i+3] = overlap[i+3] + MUL_F(transf_buf[i+3],window_long_prev[i+3]);
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}
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/* window the second half and save as overlap for next frame */
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/* construct second half window using padding with 1's and 0's */
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for (i = 0; i < nflat_ls; i++)
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overlap[i] = transf_buf[nlong+i];
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for (i = 0; i < nshort; i++)
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overlap[nflat_ls+i] = MUL_F(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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overlap[nflat_ls+nshort+i] = 0;
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break;
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case EIGHT_SHORT_SEQUENCE:
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/* perform iMDCT for each short block */
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faad_imdct(fb->mdct256, freq_in+0*nshort, transf_buf+2*nshort*0);
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faad_imdct(fb->mdct256, freq_in+1*nshort, transf_buf+2*nshort*1);
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faad_imdct(fb->mdct256, freq_in+2*nshort, transf_buf+2*nshort*2);
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faad_imdct(fb->mdct256, freq_in+3*nshort, transf_buf+2*nshort*3);
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faad_imdct(fb->mdct256, freq_in+4*nshort, transf_buf+2*nshort*4);
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faad_imdct(fb->mdct256, freq_in+5*nshort, transf_buf+2*nshort*5);
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faad_imdct(fb->mdct256, freq_in+6*nshort, transf_buf+2*nshort*6);
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faad_imdct(fb->mdct256, freq_in+7*nshort, transf_buf+2*nshort*7);
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/* add second half output of previous frame to windowed output of current frame */
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for (i = 0; i < nflat_ls; i++)
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time_out[i] = overlap[i];
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for(i = 0; i < nshort; i++)
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{
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time_out[nflat_ls+ i] = overlap[nflat_ls+ i] + MUL_F(transf_buf[nshort*0+i],window_short_prev[i]);
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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]);
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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]);
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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]);
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if (i < trans)
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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]);
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}
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/* window the second half and save as overlap for next frame */
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for(i = 0; i < nshort; i++)
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{
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if (i >= trans)
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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]);
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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]);
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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]);
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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]);
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overlap[nflat_ls+8*nshort+i-nlong] = MUL_F(transf_buf[nshort*15+i],window_short[nshort-1-i]);
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}
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for (i = 0; i < nflat_ls; i++)
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overlap[nflat_ls+nshort+i] = 0;
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break;
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case LONG_STOP_SEQUENCE:
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/* perform iMDCT */
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imdct_long(fb, freq_in, transf_buf, 2*nlong);
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/* add second half output of previous frame to windowed output of current frame */
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/* construct first half window using padding with 1's and 0's */
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for (i = 0; i < nflat_ls; i++)
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time_out[i] = overlap[i];
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for (i = 0; i < nshort; i++)
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time_out[nflat_ls+i] = overlap[nflat_ls+i] + MUL_F(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] = overlap[nflat_ls+nshort+i] + transf_buf[nflat_ls+nshort+i];
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/* window the second half and save as overlap for next frame */
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for (i = 0; i < nlong; i++)
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overlap[i] = MUL_F(transf_buf[nlong+i],window_long[nlong-1-i]);
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break;
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}
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#if 0
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for (i = 0; i < 1024; i++)
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{
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printf("%d\n", time_out[i]);
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//printf("0x%.8X\n", time_out[i]);
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}
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#endif
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#ifdef PROFILE
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count = faad_get_ts() - count;
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fb->cycles += count;
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#endif
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}
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#ifdef LTP_DEC
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/* only works for LTP -> no overlapping, no short blocks */
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void filter_bank_ltp(fb_info *fb, uint8_t window_sequence, uint8_t window_shape,
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uint8_t window_shape_prev, real_t *in_data, real_t *out_mdct,
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uint8_t object_type, uint16_t frame_len)
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{
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int16_t i;
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ALIGN real_t windowed_buf[2*1024] = {0};
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const real_t *window_long = NULL;
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const real_t *window_long_prev = NULL;
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const real_t *window_short = NULL;
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const real_t *window_short_prev = NULL;
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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 nflat_ls = (nlong-nshort)/2;
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assert(window_sequence != EIGHT_SHORT_SEQUENCE);
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#ifdef LD_DEC
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if (object_type == LD)
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{
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window_long = fb->ld_window[window_shape];
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window_long_prev = fb->ld_window[window_shape_prev];
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} else {
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#endif
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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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#ifdef LD_DEC
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}
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#endif
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switch(window_sequence)
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{
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case ONLY_LONG_SEQUENCE:
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for (i = nlong-1; i >= 0; i--)
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{
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windowed_buf[i] = MUL_F(in_data[i], window_long_prev[i]);
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windowed_buf[i+nlong] = MUL_F(in_data[i+nlong], window_long[nlong-1-i]);
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}
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mdct(fb, windowed_buf, out_mdct, 2*nlong);
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break;
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case LONG_START_SEQUENCE:
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for (i = 0; i < nlong; i++)
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windowed_buf[i] = MUL_F(in_data[i], window_long_prev[i]);
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for (i = 0; i < nflat_ls; i++)
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windowed_buf[i+nlong] = in_data[i+nlong];
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for (i = 0; i < nshort; i++)
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windowed_buf[i+nlong+nflat_ls] = MUL_F(in_data[i+nlong+nflat_ls], window_short[nshort-1-i]);
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for (i = 0; i < nflat_ls; i++)
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windowed_buf[i+nlong+nflat_ls+nshort] = 0;
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mdct(fb, windowed_buf, out_mdct, 2*nlong);
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break;
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case LONG_STOP_SEQUENCE:
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for (i = 0; i < nflat_ls; i++)
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windowed_buf[i] = 0;
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for (i = 0; i < nshort; i++)
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windowed_buf[i+nflat_ls] = MUL_F(in_data[i+nflat_ls], window_short_prev[i]);
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for (i = 0; i < nflat_ls; i++)
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windowed_buf[i+nflat_ls+nshort] = in_data[i+nflat_ls+nshort];
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for (i = 0; i < nlong; i++)
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windowed_buf[i+nlong] = MUL_F(in_data[i+nlong], window_long[nlong-1-i]);
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mdct(fb, windowed_buf, out_mdct, 2*nlong);
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break;
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}
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}
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#endif
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