diff options
Diffstat (limited to 'faad2/src/libfaad/ssr_fb.c')
| -rw-r--r-- | faad2/src/libfaad/ssr_fb.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/faad2/src/libfaad/ssr_fb.c b/faad2/src/libfaad/ssr_fb.c new file mode 100644 index 0000000..ebdcf68 --- /dev/null +++ b/faad2/src/libfaad/ssr_fb.c @@ -0,0 +1,185 @@ +/*
+** 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: ssr_fb.c,v 1.17 2007/11/01 12:33:36 menno Exp $
+**/
+
+#include "common.h"
+#include "structs.h"
+
+#ifdef SSR_DEC
+
+#include <string.h>
+#include <stdlib.h>
+#include "syntax.h"
+#include "filtbank.h"
+#include "mdct.h"
+#include "ssr_fb.h"
+#include "ssr_win.h"
+
+fb_info *ssr_filter_bank_init(uint16_t frame_len)
+{
+ uint16_t nshort = frame_len/8;
+
+ 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);
+
+ fb->long_window[0] = sine_long_256;
+ fb->short_window[0] = sine_short_32;
+ fb->long_window[1] = kbd_long_256;
+ fb->short_window[1] = kbd_short_32;
+
+ return fb;
+}
+
+void ssr_filter_bank_end(fb_info *fb)
+{
+ faad_mdct_end(fb->mdct256);
+ faad_mdct_end(fb->mdct2048);
+
+ if (fb) faad_free(fb);
+}
+
+static INLINE void imdct_ssr(fb_info *fb, real_t *in_data,
+ real_t *out_data, uint16_t len)
+{
+ mdct_info *mdct;
+
+ switch (len)
+ {
+ case 512:
+ mdct = fb->mdct2048;
+ break;
+ case 64:
+ mdct = fb->mdct256;
+ break;
+ }
+
+ faad_imdct(mdct, in_data, out_data);
+}
+
+/* NON-overlapping inverse filterbank for use with SSR */
+void ssr_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, uint16_t frame_len)
+{
+ int16_t i;
+ real_t *transf_buf;
+
+ real_t *window_long;
+ real_t *window_long_prev;
+ real_t *window_short;
+ real_t *window_short_prev;
+
+ uint16_t nlong = frame_len;
+ uint16_t nshort = frame_len/8;
+ uint16_t trans = nshort/2;
+
+ uint16_t nflat_ls = (nlong-nshort)/2;
+
+ transf_buf = (real_t*)faad_malloc(2*nlong*sizeof(real_t));
+
+ 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];
+
+ switch (window_sequence)
+ {
+ case ONLY_LONG_SEQUENCE:
+ imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
+ for (i = nlong-1; i >= 0; i--)
+ {
+ time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]);
+ time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
+ }
+ break;
+
+ case LONG_START_SEQUENCE:
+ imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
+ for (i = 0; i < nlong; i++)
+ time_out[i] = MUL_R_C(transf_buf[i],window_long_prev[i]);
+ for (i = 0; i < nflat_ls; i++)
+ time_out[nlong+i] = transf_buf[nlong+i];
+ for (i = 0; i < nshort; i++)
+ time_out[nlong+nflat_ls+i] = MUL_R_C(transf_buf[nlong+nflat_ls+i],window_short[nshort-i-1]);
+ for (i = 0; i < nflat_ls; i++)
+ time_out[nlong+nflat_ls+nshort+i] = 0;
+ break;
+
+ case EIGHT_SHORT_SEQUENCE:
+ imdct_ssr(fb, freq_in+0*nshort, transf_buf+2*nshort*0, 2*nshort);
+ imdct_ssr(fb, freq_in+1*nshort, transf_buf+2*nshort*1, 2*nshort);
+ imdct_ssr(fb, freq_in+2*nshort, transf_buf+2*nshort*2, 2*nshort);
+ imdct_ssr(fb, freq_in+3*nshort, transf_buf+2*nshort*3, 2*nshort);
+ imdct_ssr(fb, freq_in+4*nshort, transf_buf+2*nshort*4, 2*nshort);
+ imdct_ssr(fb, freq_in+5*nshort, transf_buf+2*nshort*5, 2*nshort);
+ imdct_ssr(fb, freq_in+6*nshort, transf_buf+2*nshort*6, 2*nshort);
+ imdct_ssr(fb, freq_in+7*nshort, transf_buf+2*nshort*7, 2*nshort);
+ for(i = nshort-1; i >= 0; i--)
+ {
+ time_out[i+0*nshort] = MUL_R_C(transf_buf[nshort*0+i],window_short_prev[i]);
+ time_out[i+1*nshort] = MUL_R_C(transf_buf[nshort*1+i],window_short[i]);
+ time_out[i+2*nshort] = MUL_R_C(transf_buf[nshort*2+i],window_short_prev[i]);
+ time_out[i+3*nshort] = MUL_R_C(transf_buf[nshort*3+i],window_short[i]);
+ time_out[i+4*nshort] = MUL_R_C(transf_buf[nshort*4+i],window_short_prev[i]);
+ time_out[i+5*nshort] = MUL_R_C(transf_buf[nshort*5+i],window_short[i]);
+ time_out[i+6*nshort] = MUL_R_C(transf_buf[nshort*6+i],window_short_prev[i]);
+ time_out[i+7*nshort] = MUL_R_C(transf_buf[nshort*7+i],window_short[i]);
+ time_out[i+8*nshort] = MUL_R_C(transf_buf[nshort*8+i],window_short_prev[i]);
+ time_out[i+9*nshort] = MUL_R_C(transf_buf[nshort*9+i],window_short[i]);
+ time_out[i+10*nshort] = MUL_R_C(transf_buf[nshort*10+i],window_short_prev[i]);
+ time_out[i+11*nshort] = MUL_R_C(transf_buf[nshort*11+i],window_short[i]);
+ time_out[i+12*nshort] = MUL_R_C(transf_buf[nshort*12+i],window_short_prev[i]);
+ time_out[i+13*nshort] = MUL_R_C(transf_buf[nshort*13+i],window_short[i]);
+ time_out[i+14*nshort] = MUL_R_C(transf_buf[nshort*14+i],window_short_prev[i]);
+ time_out[i+15*nshort] = MUL_R_C(transf_buf[nshort*15+i],window_short[i]);
+ }
+ break;
+
+ case LONG_STOP_SEQUENCE:
+ imdct_ssr(fb, freq_in, transf_buf, 2*nlong);
+ for (i = 0; i < nflat_ls; i++)
+ time_out[i] = 0;
+ for (i = 0; i < nshort; i++)
+ time_out[nflat_ls+i] = MUL_R_C(transf_buf[nflat_ls+i],window_short_prev[i]);
+ for (i = 0; i < nflat_ls; i++)
+ time_out[nflat_ls+nshort+i] = transf_buf[nflat_ls+nshort+i];
+ for (i = 0; i < nlong; i++)
+ time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
+ break;
+ }
+
+ faad_free(transf_buf);
+}
+
+
+#endif
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