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-rw-r--r--faad2/src/libfaad/ssr.c175
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diff --git a/faad2/src/libfaad/ssr.c b/faad2/src/libfaad/ssr.c
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--- a/faad2/src/libfaad/ssr.c
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-/*
-** 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.c,v 1.19 2007/11/01 12:33:36 menno Exp $
-**/
-
-#include "common.h"
-#include "structs.h"
-
-#ifdef SSR_DEC
-
-#include "syntax.h"
-#include "filtbank.h"
-#include "ssr.h"
-#include "ssr_fb.h"
-
-void ssr_decode(ssr_info *ssr, 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,
- real_t ipqf_buffer[SSR_BANDS][96/4],
- real_t *prev_fmd, uint16_t frame_len)
-{
- uint8_t band;
- uint16_t ssr_frame_len = frame_len/SSR_BANDS;
- real_t time_tmp[2048] = {0};
- real_t output[1024] = {0};
-
- for (band = 0; band < SSR_BANDS; band++)
- {
- int16_t j;
-
- /* uneven bands have inverted frequency scale */
- if (band == 1 || band == 3)
- {
- for (j = 0; j < ssr_frame_len/2; j++)
- {
- real_t tmp;
- tmp = freq_in[j + ssr_frame_len*band];
- freq_in[j + ssr_frame_len*band] =
- freq_in[ssr_frame_len - j - 1 + ssr_frame_len*band];
- freq_in[ssr_frame_len - j - 1 + ssr_frame_len*band] = tmp;
- }
- }
-
- /* non-overlapping inverse filterbank for SSR */
- ssr_ifilter_bank(fb, window_sequence, window_shape, window_shape_prev,
- freq_in + band*ssr_frame_len, time_tmp + band*ssr_frame_len,
- ssr_frame_len);
-
- /* gain control */
- ssr_gain_control(ssr, time_tmp, output, overlap, prev_fmd,
- band, window_sequence, ssr_frame_len);
- }
-
- /* inverse pqf to bring subbands together again */
- ssr_ipqf(ssr, output, time_out, ipqf_buffer, frame_len, SSR_BANDS);
-}
-
-static void ssr_gain_control(ssr_info *ssr, real_t *data, real_t *output,
- real_t *overlap, real_t *prev_fmd, uint8_t band,
- uint8_t window_sequence, uint16_t frame_len)
-{
- uint16_t i;
- real_t gc_function[2*1024/SSR_BANDS];
-
- if (window_sequence != EIGHT_SHORT_SEQUENCE)
- {
- ssr_gc_function(ssr, &prev_fmd[band * frame_len*2],
- gc_function, window_sequence, band, frame_len);
-
- for (i = 0; i < frame_len*2; i++)
- data[band * frame_len*2 + i] *= gc_function[i];
- for (i = 0; i < frame_len; i++)
- {
- output[band*frame_len + i] = overlap[band*frame_len + i] +
- data[band*frame_len*2 + i];
- }
- for (i = 0; i < frame_len; i++)
- {
- overlap[band*frame_len + i] =
- data[band*frame_len*2 + frame_len + i];
- }
- } else {
- uint8_t w;
- for (w = 0; w < 8; w++)
- {
- uint16_t frame_len8 = frame_len/8;
- uint16_t frame_len16 = frame_len/16;
-
- ssr_gc_function(ssr, &prev_fmd[band*frame_len*2 + w*frame_len*2/8],
- gc_function, window_sequence, frame_len);
-
- for (i = 0; i < frame_len8*2; i++)
- data[band*frame_len*2 + w*frame_len8*2+i] *= gc_function[i];
- for (i = 0; i < frame_len8; i++)
- {
- overlap[band*frame_len + i + 7*frame_len16 + w*frame_len8] +=
- data[band*frame_len*2 + 2*w*frame_len8 + i];
- }
- for (i = 0; i < frame_len8; i++)
- {
- overlap[band*frame_len + i + 7*frame_len16 + (w+1)*frame_len8] =
- data[band*frame_len*2 + 2*w*frame_len8 + frame_len8 + i];
- }
- }
- for (i = 0; i < frame_len; i++)
- output[band*frame_len + i] = overlap[band*frame_len + i];
- for (i = 0; i < frame_len; i++)
- overlap[band*frame_len + i] = overlap[band*frame_len + i + frame_len];
- }
-}
-
-static void ssr_gc_function(ssr_info *ssr, real_t *prev_fmd,
- real_t *gc_function, uint8_t window_sequence,
- uint8_t band, uint16_t frame_len)
-{
- uint16_t i;
- uint16_t len_area1, len_area2;
- int32_t aloc[10];
- real_t alev[10];
-
- switch (window_sequence)
- {
- case ONLY_LONG_SEQUENCE:
- len_area1 = frame_len/SSR_BANDS;
- len_area2 = 0;
- break;
- case LONG_START_SEQUENCE:
- len_area1 = (frame_len/SSR_BANDS)*7/32;
- len_area2 = (frame_len/SSR_BANDS)/16;
- break;
- case EIGHT_SHORT_SEQUENCE:
- len_area1 = (frame_len/8)/SSR_BANDS;
- len_area2 = 0;
- break;
- case LONG_STOP_SEQUENCE:
- len_area1 = (frame_len/SSR_BANDS);
- len_area2 = 0;
- break;
- }
-
- /* decode bitstream information */
-
- /* build array M */
-
-
- for (i = 0; i < frame_len*2; i++)
- gc_function[i] = 1;
-}
-
-#endif