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-rw-r--r--faad2/src/libfaad/tns.c309
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diff --git a/faad2/src/libfaad/tns.c b/faad2/src/libfaad/tns.c
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--- a/faad2/src/libfaad/tns.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: tns.c,v 1.40 2007/11/01 12:33:40 menno Exp $
-**/
-
-#include "common.h"
-#include "structs.h"
-
-#include "syntax.h"
-#include "tns.h"
-
-
-/* static function declarations */
-static void tns_decode_coef(uint8_t order, uint8_t coef_res_bits, uint8_t coef_compress,
- uint8_t *coef, real_t *a);
-static void tns_ar_filter(real_t *spectrum, uint16_t size, int8_t inc, real_t *lpc,
- uint8_t order);
-static void tns_ma_filter(real_t *spectrum, uint16_t size, int8_t inc, real_t *lpc,
- uint8_t order);
-
-
-#ifdef _MSC_VER
-#pragma warning(disable:4305)
-#pragma warning(disable:4244)
-#endif
-static real_t tns_coef_0_3[] =
-{
- COEF_CONST(0.0), COEF_CONST(0.4338837391), COEF_CONST(0.7818314825), COEF_CONST(0.9749279122),
- COEF_CONST(-0.9848077530), COEF_CONST(-0.8660254038), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433),
- COEF_CONST(-0.4338837391), COEF_CONST(-0.7818314825), COEF_CONST(-0.9749279122), COEF_CONST(-0.9749279122),
- COEF_CONST(-0.9848077530), COEF_CONST(-0.8660254038), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433)
-};
-static real_t tns_coef_0_4[] =
-{
- COEF_CONST(0.0), COEF_CONST(0.2079116908), COEF_CONST(0.4067366431), COEF_CONST(0.5877852523),
- COEF_CONST(0.7431448255), COEF_CONST(0.8660254038), COEF_CONST(0.9510565163), COEF_CONST(0.9945218954),
- COEF_CONST(-0.9957341763), COEF_CONST(-0.9618256432), COEF_CONST(-0.8951632914), COEF_CONST(-0.7980172273),
- COEF_CONST(-0.6736956436), COEF_CONST(-0.5264321629), COEF_CONST(-0.3612416662), COEF_CONST(-0.1837495178)
-};
-static real_t tns_coef_1_3[] =
-{
- COEF_CONST(0.0), COEF_CONST(0.4338837391), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433),
- COEF_CONST(0.9749279122), COEF_CONST(0.7818314825), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433),
- COEF_CONST(-0.4338837391), COEF_CONST(-0.7818314825), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433),
- COEF_CONST(-0.7818314825), COEF_CONST(-0.4338837391), COEF_CONST(-0.6427876097), COEF_CONST(-0.3420201433)
-};
-static real_t tns_coef_1_4[] =
-{
- COEF_CONST(0.0), COEF_CONST(0.2079116908), COEF_CONST(0.4067366431), COEF_CONST(0.5877852523),
- COEF_CONST(-0.6736956436), COEF_CONST(-0.5264321629), COEF_CONST(-0.3612416662), COEF_CONST(-0.1837495178),
- COEF_CONST(0.9945218954), COEF_CONST(0.9510565163), COEF_CONST(0.8660254038), COEF_CONST(0.7431448255),
- COEF_CONST(-0.6736956436), COEF_CONST(-0.5264321629), COEF_CONST(-0.3612416662), COEF_CONST(-0.1837495178)
-};
-
-
-/* TNS decoding for one channel and frame */
-void tns_decode_frame(ic_stream *ics, tns_info *tns, uint8_t sr_index,
- uint8_t object_type, real_t *spec, uint16_t frame_len)
-{
- uint8_t w, f, tns_order;
- int8_t inc;
- int16_t size;
- uint16_t bottom, top, start, end;
- uint16_t nshort = frame_len/8;
- real_t lpc[TNS_MAX_ORDER+1];
-
- if (!ics->tns_data_present)
- return;
-
- for (w = 0; w < ics->num_windows; w++)
- {
- bottom = ics->num_swb;
-
- for (f = 0; f < tns->n_filt[w]; f++)
- {
- top = bottom;
- bottom = max(top - tns->length[w][f], 0);
- tns_order = min(tns->order[w][f], TNS_MAX_ORDER);
- if (!tns_order)
- continue;
-
- tns_decode_coef(tns_order, tns->coef_res[w]+3,
- tns->coef_compress[w][f], tns->coef[w][f], lpc);
-
- start = min(bottom, max_tns_sfb(sr_index, object_type, (ics->window_sequence == EIGHT_SHORT_SEQUENCE)));
- start = min(start, ics->max_sfb);
- start = min(ics->swb_offset[start], ics->swb_offset_max);
-
- end = min(top, max_tns_sfb(sr_index, object_type, (ics->window_sequence == EIGHT_SHORT_SEQUENCE)));
- end = min(end, ics->max_sfb);
- end = min(ics->swb_offset[end], ics->swb_offset_max);
-
- size = end - start;
- if (size <= 0)
- continue;
-
- if (tns->direction[w][f])
- {
- inc = -1;
- start = end - 1;
- } else {
- inc = 1;
- }
-
- tns_ar_filter(&spec[(w*nshort)+start], size, inc, lpc, tns_order);
- }
- }
-}
-
-/* TNS encoding for one channel and frame */
-void tns_encode_frame(ic_stream *ics, tns_info *tns, uint8_t sr_index,
- uint8_t object_type, real_t *spec, uint16_t frame_len)
-{
- uint8_t w, f, tns_order;
- int8_t inc;
- int16_t size;
- uint16_t bottom, top, start, end;
- uint16_t nshort = frame_len/8;
- real_t lpc[TNS_MAX_ORDER+1];
-
- if (!ics->tns_data_present)
- return;
-
- for (w = 0; w < ics->num_windows; w++)
- {
- bottom = ics->num_swb;
-
- for (f = 0; f < tns->n_filt[w]; f++)
- {
- top = bottom;
- bottom = max(top - tns->length[w][f], 0);
- tns_order = min(tns->order[w][f], TNS_MAX_ORDER);
- if (!tns_order)
- continue;
-
- tns_decode_coef(tns_order, tns->coef_res[w]+3,
- tns->coef_compress[w][f], tns->coef[w][f], lpc);
-
- start = min(bottom, max_tns_sfb(sr_index, object_type, (ics->window_sequence == EIGHT_SHORT_SEQUENCE)));
- start = min(start, ics->max_sfb);
- start = min(ics->swb_offset[start], ics->swb_offset_max);
-
- end = min(top, max_tns_sfb(sr_index, object_type, (ics->window_sequence == EIGHT_SHORT_SEQUENCE)));
- end = min(end, ics->max_sfb);
- end = min(ics->swb_offset[end], ics->swb_offset_max);
-
- size = end - start;
- if (size <= 0)
- continue;
-
- if (tns->direction[w][f])
- {
- inc = -1;
- start = end - 1;
- } else {
- inc = 1;
- }
-
- tns_ma_filter(&spec[(w*nshort)+start], size, inc, lpc, tns_order);
- }
- }
-}
-
-/* Decoder transmitted coefficients for one TNS filter */
-static void tns_decode_coef(uint8_t order, uint8_t coef_res_bits, uint8_t coef_compress,
- uint8_t *coef, real_t *a)
-{
- uint8_t i, m;
- real_t tmp2[TNS_MAX_ORDER+1], b[TNS_MAX_ORDER+1];
-
- /* Conversion to signed integer */
- for (i = 0; i < order; i++)
- {
- if (coef_compress == 0)
- {
- if (coef_res_bits == 3)
- {
- tmp2[i] = tns_coef_0_3[coef[i]];
- } else {
- tmp2[i] = tns_coef_0_4[coef[i]];
- }
- } else {
- if (coef_res_bits == 3)
- {
- tmp2[i] = tns_coef_1_3[coef[i]];
- } else {
- tmp2[i] = tns_coef_1_4[coef[i]];
- }
- }
- }
-
- /* Conversion to LPC coefficients */
- a[0] = COEF_CONST(1.0);
- for (m = 1; m <= order; m++)
- {
- for (i = 1; i < m; i++) /* loop only while i<m */
- b[i] = a[i] + MUL_C(tmp2[m-1], a[m-i]);
-
- for (i = 1; i < m; i++) /* loop only while i<m */
- a[i] = b[i];
-
- a[m] = tmp2[m-1]; /* changed */
- }
-}
-
-static void tns_ar_filter(real_t *spectrum, uint16_t size, int8_t inc, real_t *lpc,
- uint8_t order)
-{
- /*
- - Simple all-pole filter of order "order" defined by
- y(n) = x(n) - lpc[1]*y(n-1) - ... - lpc[order]*y(n-order)
- - The state variables of the filter are initialized to zero every time
- - The output data is written over the input data ("in-place operation")
- - An input vector of "size" samples is processed and the index increment
- to the next data sample is given by "inc"
- */
-
- uint8_t j;
- uint16_t i;
- real_t y;
- /* state is stored as a double ringbuffer */
- real_t state[2*TNS_MAX_ORDER] = {0};
- int8_t state_index = 0;
-
- for (i = 0; i < size; i++)
- {
- y = *spectrum;
-
- for (j = 0; j < order; j++)
- y -= MUL_C(state[state_index+j], lpc[j+1]);
-
- /* double ringbuffer state */
- state_index--;
- if (state_index < 0)
- state_index = order-1;
- state[state_index] = state[state_index + order] = y;
-
- *spectrum = y;
- spectrum += inc;
-
-//#define TNS_PRINT
-#ifdef TNS_PRINT
- //printf("%d\n", y);
- printf("0x%.8X\n", y);
-#endif
- }
-}
-
-static void tns_ma_filter(real_t *spectrum, uint16_t size, int8_t inc, real_t *lpc,
- uint8_t order)
-{
- /*
- - Simple all-zero filter of order "order" defined by
- y(n) = x(n) + a(2)*x(n-1) + ... + a(order+1)*x(n-order)
- - The state variables of the filter are initialized to zero every time
- - The output data is written over the input data ("in-place operation")
- - An input vector of "size" samples is processed and the index increment
- to the next data sample is given by "inc"
- */
-
- uint8_t j;
- uint16_t i;
- real_t y;
- /* state is stored as a double ringbuffer */
- real_t state[2*TNS_MAX_ORDER] = {0};
- int8_t state_index = 0;
-
- for (i = 0; i < size; i++)
- {
- y = *spectrum;
-
- for (j = 0; j < order; j++)
- y += MUL_C(state[state_index+j], lpc[j+1]);
-
- /* double ringbuffer state */
- state_index--;
- if (state_index < 0)
- state_index = order-1;
- state[state_index] = state[state_index + order] = *spectrum;
-
- *spectrum = y;
- spectrum += inc;
- }
-}
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