ref: 9a9fa10c760b59e48c567d408de3878498755f84
dir: /libfaad/filtbank.c/
/*
** FAAD - Freeware Advanced Audio Decoder
** Copyright (C) 2002 M. Bakker
**
** 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.
**
** $Id: filtbank.c,v 1.11 2002/08/05 20:33:38 menno Exp $
**/
#include "common.h"
#include <stdlib.h>
#include <assert.h>
#include "filtbank.h"
#include "syntax.h"
#include "kbd_win.h"
#include "mdct.h"
void filter_bank_init(fb_info *fb, uint16_t frame_len)
{
uint16_t i;
uint16_t nshort = frame_len/8;
#ifdef LD_DEC
uint16_t frame_len_ld = frame_len/2;
#endif
/* normal */
faad_mdct_init(&(fb->mdct256), 2*nshort);
faad_mdct_init(&(fb->mdct2048), 2*frame_len);
fb->long_window[0] = malloc(frame_len*sizeof(real_t));
fb->short_window[0] = malloc(nshort*sizeof(real_t));
fb->long_window[1] = kbd_long;
fb->short_window[1] = kbd_short;
/* calculate the sine windows */
for (i = 0; i < frame_len; i++)
fb->long_window[0][i] = (real_t)sin(M_PI / (2.0 * frame_len) * (i + 0.5));
for (i = 0; i < nshort; i++)
fb->short_window[0][i] = (real_t)sin(M_PI / (2.0 * nshort) * (i + 0.5));
#ifdef LD_DEC
/* LD */
faad_mdct_init(&(fb->mdct1024), frame_len_ld);
fb->ld_window[0] = malloc(frame_len_ld*sizeof(real_t));
fb->ld_window[1] = malloc(frame_len_ld*sizeof(real_t));
/* calculate the sine windows */
for (i = 0; i < frame_len_ld; i++)
fb->ld_window[0][i] = (real_t)sin(M_PI / (2.0 * frame_len_ld) * (i + 0.5));
/* low overlap window */
for (i = 0; i < 3*(frame_len_ld>>3); i++)
fb->ld_window[1][i] = 0.0;
for (; i < 5*(frame_len_ld>>3); i++)
fb->ld_window[1][i] = (real_t)sin((i-3*(frame_len_ld>>3)+0.5) * M_PI / (frame_len_ld>>1));
for (; i < frame_len_ld; i++)
fb->ld_window[1][i] = 1.0;
#endif
}
void filter_bank_end(fb_info *fb)
{
faad_mdct_end(&(fb->mdct256));
faad_mdct_end(&(fb->mdct2048));
if (fb->long_window[0]) free(fb->long_window[0]);
if (fb->short_window[0]) free(fb->short_window[0]);
#ifdef LD_DEC
faad_mdct_end(&(fb->mdct1024));
if (fb->ld_window[0]) free(fb->ld_window[0]);
if (fb->ld_window[1]) free(fb->ld_window[1]);
#endif
}
static INLINE void vcopy(real_t *src, real_t *dest, uint16_t vlen)
{
int16_t i;
assert(vlen % 4 == 0);
for (i = vlen/4-1; i >= 0; --i)
{
*dest++ = *src++; *dest++ = *src++; *dest++ = *src++; *dest++ = *src++;
}
}
static INLINE void vzero(real_t *dest, uint16_t vlen)
{
int16_t i;
assert(vlen % 4 == 0);
for (i = vlen/4-1; i >= 0; --i)
{
*dest-- = 0; *dest-- = 0; *dest-- = 0; *dest-- = 0;
}
}
static INLINE void vmult1(real_t *src1, real_t *src2, real_t *dest, uint16_t vlen)
{
int16_t i;
assert(vlen % 4 == 0);
for (i = vlen/4-1; i >= 0 ; --i)
{
*dest++ = MUL(*src1++, *src2++); *dest++ = MUL(*src1++, *src2++);
*dest++ = MUL(*src1++, *src2++); *dest++ = MUL(*src1++, *src2++);
}
}
static INLINE void vmult2(real_t *src1, real_t *src2, real_t *dest, uint16_t vlen)
{
int16_t i;
assert(vlen % 4 == 0);
for (i = vlen/4-1; i >= 0 ; --i)
{
*dest++ = MUL(*src1++, *src2--); *dest++ = MUL(*src1++, *src2--);
*dest++ = MUL(*src1++, *src2--); *dest++ = MUL(*src1++, *src2--);
}
}
static INLINE void vadd(real_t *src1, real_t *src2, real_t *dest, uint16_t vlen)
{
int16_t i;
assert(vlen % 4 == 0);
for (i = vlen/4-1; i >= 0; --i)
{
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
/*
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*dest++ = *src1++ + *src2++; *dest++ = *src1++ + *src2++;
*/
}
}
static INLINE void imdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
{
mdct_info *mdct;
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_imdct(mdct, in_data, out_data);
}
#ifdef LTP_DEC
static INLINE void mdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
{
mdct_info *mdct;
switch (len)
{
case 2048:
case 1920:
mdct = &(fb->mdct2048);
break;
case 256:
case 120:
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_buff,
real_t *time_out, uint8_t object_type, uint16_t frame_len)
{
real_t *o_buf, *transf_buf;
real_t *obuf_temp;
real_t *window_long;
real_t *window_long_prev;
real_t *window_short;
real_t *window_short_prev;
real_t *window_short_prev_ptr;
real_t *fp;
int8_t win;
uint16_t nlong = frame_len;
uint16_t nshort = frame_len/8;
uint16_t nflat_ls = (nlong-nshort)/2;
transf_buf = malloc(2*nlong*sizeof(real_t));
#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
/* pointer to previous window function */
window_short_prev_ptr = window_short_prev;
vcopy(time_buff, time_out, nlong);
o_buf = time_out;
switch (window_sequence)
{
case ONLY_LONG_SEQUENCE:
/* inverse transform */
imdct(fb, freq_in, transf_buf, 2*nlong);
/* window function (previous) on first half of the new data */
vmult1(transf_buf, window_long_prev, transf_buf, nlong);
/* overlap and add second half of the old data with first half
of the new data */
vadd(transf_buf, o_buf, o_buf, nlong);
/* reversed window function on second half of the new data */
vmult2(transf_buf+nlong, window_long+nlong-1, o_buf+nlong, nlong);
break;
case LONG_START_SEQUENCE:
/* inverse transform */
imdct(fb, freq_in, transf_buf, 2*nlong);
/* window function (previous) on first half of the new data */
vmult1(transf_buf, window_long_prev, transf_buf, nlong);
/* overlap and add second half of the old data with first half
of the new data */
vadd(transf_buf, o_buf, o_buf, nlong);
/* copy data from nlong upto (3*nlong-nshort)/4; (window function = 1.0) */
vcopy(transf_buf+nlong, o_buf+nlong, nflat_ls);
/* reversed window function on part of second half of the new data */
vmult2(transf_buf+nlong+nflat_ls, window_short+nshort-1,
o_buf+nlong+nflat_ls, nshort);
/* zero rest of the data; (window function = 0.0) */
vzero(o_buf+2*nlong-1, nflat_ls);
break;
case EIGHT_SHORT_SEQUENCE:
obuf_temp = malloc(2*nlong*sizeof(real_t));
vzero(obuf_temp+2*nlong-1, 2*nlong);
fp = obuf_temp;
vcopy(time_buff+nflat_ls, fp, nshort);
for (win = 8-1; win >= 0; --win)
{
/* inverse transform */
imdct(fb, freq_in, transf_buf, 2*nshort);
/* window function (previous) on first half of the new data */
vmult1(transf_buf, window_short_prev_ptr, transf_buf, nshort);
/* overlap and add second half of the old data with first half
of the new data */
vadd(transf_buf, fp, fp, nshort);
/* reversed window function on second half of the new data */
vmult2(transf_buf+nshort, window_short+nshort-1, fp+nshort, nshort);
/* shift to next short block */
freq_in += nshort;
fp += nshort;
window_short_prev_ptr = window_short;
}
vcopy(obuf_temp, o_buf + nflat_ls, nlong*2-nflat_ls);
vzero(o_buf+2*nlong-1, nflat_ls);
free(obuf_temp);
break;
case LONG_STOP_SEQUENCE:
/* inverse transform */
imdct(fb, freq_in, transf_buf, 2*nlong);
/* zero first part of first half of the data (window function = 0.0) */
vzero(transf_buf+nflat_ls-1, nflat_ls);
/* window function (previous) on part of the first half of
the new data */
vmult1(transf_buf+nflat_ls, window_short_prev_ptr,
transf_buf+nflat_ls, nshort);
/* third part of the stop sequence window is window function = 1,
so no need to actually apply that */
/* overlap and add second half of the old data with first half
of the new data */
vadd(transf_buf, o_buf, o_buf, nlong);
/* reversed window function on second half of the new data */
vmult2(transf_buf+nlong, window_long+nlong-1, o_buf+nlong, nlong);
break;
}
/* save second half of data */
vcopy(o_buf+nlong, time_buff, nlong);
free(transf_buf);
}
#ifdef LTP_DEC
/* only works for LTP -> no overlapping */
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)
{
int8_t win;
real_t *windowed_buf;
real_t *p_o_buf;
real_t *window_long;
real_t *window_long_prev;
real_t *window_short;
real_t *window_short_prev;
real_t *window_short_prev_ptr;
uint16_t nlong = frame_len;
uint16_t nshort = frame_len/8;
uint16_t nflat_ls = (nlong-nshort)/2;
windowed_buf = malloc(nlong*2*sizeof(real_t));
#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
window_short_prev_ptr = window_short_prev;
p_o_buf = in_data;
switch(window_sequence)
{
case ONLY_LONG_SEQUENCE:
vmult1(p_o_buf, window_long_prev, windowed_buf, nlong);
vmult2(p_o_buf+nlong, window_long+nlong-1, windowed_buf+nlong, nlong);
mdct(fb, windowed_buf, out_mdct, 2*nlong);
break;
case LONG_START_SEQUENCE:
vmult1(p_o_buf, window_long_prev, windowed_buf, nlong);
vcopy(p_o_buf+nlong, windowed_buf+nlong, nflat_ls);
vmult2(p_o_buf+nlong+nflat_ls, window_short+nshort-1, windowed_buf+nlong+nflat_ls, nshort);
vzero(windowed_buf+2*nlong-1, nflat_ls);
mdct(fb, windowed_buf, out_mdct, 2*nlong);
break;
case EIGHT_SHORT_SEQUENCE:
for (win = 8-1; win >= 0; --win)
{
vmult1(p_o_buf, window_short_prev_ptr, windowed_buf, nshort);
vmult2(p_o_buf+nshort, window_short+nshort-1, windowed_buf+nshort, nshort);
mdct(fb, windowed_buf, out_mdct, 2*nshort);
out_mdct += nshort;
p_o_buf += 2*nshort;
window_short_prev_ptr = window_short;
}
break;
case LONG_STOP_SEQUENCE:
vzero(windowed_buf+nflat_ls-1, nflat_ls);
vmult1(p_o_buf+nflat_ls, window_short_prev_ptr, windowed_buf+nflat_ls, nshort);
vcopy(p_o_buf+nflat_ls+nshort, windowed_buf+nflat_ls+nshort, nflat_ls);
vmult2(p_o_buf+nlong, window_long+nlong-1, windowed_buf+nlong, nlong);
mdct(fb, windowed_buf, out_mdct, 2*nlong);
break;
}
free(windowed_buf);
}
#endif