/* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding ** Copyright (C) 2003-2004 M. Bakker, Ahead Software 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. ** ** Commercial non-GPL licensing of this software is possible. ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. ** ** $Id: filtbank.c,v 1.41 2004/09/08 09:43:11 gcp Exp $ **/ #include "common.h" #include "structs.h" #include <stdlib.h> #include <string.h> #ifdef _WIN32_WCE #define assert(x) #else #include <assert.h> #endif #include "filtbank.h" #include "decoder.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