mirror of https://github.com/mpv-player/mpv
620 lines
17 KiB
C
620 lines
17 KiB
C
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id: sbr_fbt.c,v 1.3 2003/09/09 18:37:32 menno Exp $
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**/
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/* Calculate frequency band tables */
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#include "common.h"
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#include "structs.h"
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#ifdef SBR_DEC
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#include <stdlib.h>
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#include "sbr_syntax.h"
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#include "sbr_fbt.h"
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/* calculate the start QMF channel for the master frequency band table */
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/* parameter is also called k0 */
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uint8_t qmf_start_channel(uint8_t bs_start_freq, uint8_t bs_samplerate_mode,
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uint32_t sample_rate)
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{
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static const uint8_t startMinTable[12] = { 7, 7, 10, 11, 12, 16, 16,
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17, 24, 32, 35, 48 };
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static const uint8_t offsetIndexTable[12] = { 5, 5, 4, 4, 4, 3, 2, 1, 0,
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6, 6, 6 };
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static const int8_t offset[7][16] = {
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{ -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7 },
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{ -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13 },
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{ -5, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16 },
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{ -6, -4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16 },
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{ -4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20 },
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{ -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20, 24 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20, 24, 28, 33 }
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};
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uint8_t startMin = startMinTable[get_sr_index(sample_rate)];
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uint8_t offsetIndex = offsetIndexTable[get_sr_index(sample_rate)];
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#if 0 /* replaced with table (startMinTable) */
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if (sample_rate >= 64000)
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{
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startMin = (uint8_t)((5000.*128.)/(float)sample_rate + 0.5);
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} else if (sample_rate < 32000) {
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startMin = (uint8_t)((3000.*128.)/(float)sample_rate + 0.5);
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} else {
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startMin = (uint8_t)((4000.*128.)/(float)sample_rate + 0.5);
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}
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#endif
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if (bs_samplerate_mode)
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{
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return startMin + offset[offsetIndex][bs_start_freq];
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#if 0 /* replaced by offsetIndexTable */
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switch (sample_rate)
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{
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case 16000:
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return startMin + offset[0][bs_start_freq];
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case 22050:
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return startMin + offset[1][bs_start_freq];
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case 24000:
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return startMin + offset[2][bs_start_freq];
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case 32000:
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return startMin + offset[3][bs_start_freq];
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default:
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if (sample_rate > 64000)
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{
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return startMin + offset[5][bs_start_freq];
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} else { /* 44100 <= sample_rate <= 64000 */
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return startMin + offset[4][bs_start_freq];
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}
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}
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#endif
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} else {
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return startMin + offset[6][bs_start_freq];
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}
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}
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static int32_t longcmp(const void *a, const void *b)
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{
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return ((int32_t)(*(int32_t*)a - *(int32_t*)b));
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}
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/* calculate the stop QMF channel for the master frequency band table */
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/* parameter is also called k2 */
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uint8_t qmf_stop_channel(uint8_t bs_stop_freq, uint32_t sample_rate,
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uint8_t k0)
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{
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if (bs_stop_freq == 15)
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{
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return min(64, k0 * 3);
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} else if (bs_stop_freq == 14) {
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return min(64, k0 * 2);
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} else {
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static const uint8_t stopMinTable[12] = { 13, 15, 20, 21, 23,
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32, 32, 35, 48, 64, 70, 96 };
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static const int8_t offset[12][14] = {
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{ 0, 2, 4, 6, 8, 11, 14, 18, 22, 26, 31, 37, 44, 51 },
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{ 0, 2, 4, 6, 8, 11, 14, 18, 22, 26, 31, 36, 42, 49 },
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{ 0, 2, 4, 6, 8, 11, 14, 17, 21, 25, 29, 34, 39, 44 },
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{ 0, 2, 4, 6, 8, 11, 14, 17, 20, 24, 28, 33, 38, 43 },
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{ 0, 2, 4, 6, 8, 11, 14, 17, 20, 24, 28, 32, 36, 41 },
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{ 0, 2, 4, 6, 8, 10, 12, 14, 17, 20, 23, 26, 29, 32 },
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{ 0, 2, 4, 6, 8, 10, 12, 14, 17, 20, 23, 26, 29, 32 },
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{ 0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 20, 23, 26, 29 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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{ 0, -1, -2, -3, -4, -5, -6, -6, -6, -6, -6, -6, -6, -6 },
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{ 0, -3, -6, -9, -12, -15, -18, -20, -22, -24, -26, -28, -30, -32 }
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};
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#if 0
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uint8_t i;
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int32_t stopDk[13], stopDk_t[14], k2;
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#endif
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uint8_t stopMin = stopMinTable[get_sr_index(sample_rate)];
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#if 0 /* replaced by table lookup */
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if (sample_rate >= 64000)
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{
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stopMin = (uint8_t)((10000.*128.)/(float)sample_rate + 0.5);
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} else if (sample_rate < 32000) {
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stopMin = (uint8_t)((6000.*128.)/(float)sample_rate + 0.5);
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} else {
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stopMin = (uint8_t)((8000.*128.)/(float)sample_rate + 0.5);
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}
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#endif
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#if 0 /* replaced by table lookup */
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/* diverging power series */
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for (i = 0; i <= 13; i++)
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{
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stopDk_t[i] = (int32_t)(stopMin*pow(64.0/stopMin, i/13.0) + 0.5);
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}
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for (i = 0; i < 13; i++)
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{
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stopDk[i] = stopDk_t[i+1] - stopDk_t[i];
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}
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/* needed? */
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qsort(stopDk, 13, sizeof(stopDk[0]), longcmp);
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k2 = stopMin;
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for (i = 0; i < bs_stop_freq; i++)
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{
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k2 += stopDk[i];
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}
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return min(64, k2);
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#endif
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/* bs_stop_freq <= 13 */
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return min(64, stopMin + offset[get_sr_index(sample_rate)][min(bs_stop_freq, 13)]);
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}
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return 0;
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}
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/* calculate the master frequency table from k0, k2, bs_freq_scale
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and bs_alter_scale
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version for bs_freq_scale = 0
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*/
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void master_frequency_table_fs0(sbr_info *sbr, uint8_t k0, uint8_t k2,
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uint8_t bs_alter_scale)
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{
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int8_t incr;
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uint8_t k;
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uint8_t dk;
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uint32_t nrBands, k2Achieved;
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int32_t k2Diff, vDk[64];
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memset(vDk, 0, 64*sizeof(int32_t));
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/* mft only defined for k2 > k0 */
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if (k2 <= k0)
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{
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sbr->N_master = 0;
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return;
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}
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dk = bs_alter_scale ? 2 : 1;
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#if 0 /* replaced by float-less design */
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nrBands = 2 * (int32_t)((float)(k2-k0)/(dk*2) + (-1+dk)/2.0f);
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#else
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if (bs_alter_scale)
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{
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nrBands = (((k2-k0+2)>>2)<<1);
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} else {
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nrBands = (((k2-k0)>>1)<<1);
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}
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#endif
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nrBands = min(nrBands, 63);
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k2Achieved = k0 + nrBands * dk;
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k2Diff = k2 - k2Achieved;
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for (k = 0; k < nrBands; k++)
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vDk[k] = dk;
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if (k2Diff)
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{
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incr = (k2Diff > 0) ? -1 : 1;
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k = (k2Diff > 0) ? (nrBands-1) : 0;
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while (k2Diff != 0)
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{
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vDk[k] -= incr;
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k += incr;
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k2Diff += incr;
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}
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}
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sbr->f_master[0] = k0;
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for (k = 1; k <= nrBands; k++)
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sbr->f_master[k] = sbr->f_master[k-1] + vDk[k-1];
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sbr->N_master = nrBands;
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sbr->N_master = min(sbr->N_master, 64);
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#if 0
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printf("f_master[%d]: ", nrBands);
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for (k = 0; k <= nrBands; k++)
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{
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printf("%d ", sbr->f_master[k]);
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}
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printf("\n");
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#endif
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}
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/*
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This function finds the number of bands using this formula:
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bands * log(a1/a0)/log(2.0) + 0.5
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*/
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static int32_t find_bands(uint8_t warp, uint8_t bands, uint8_t a0, uint8_t a1)
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{
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real_t div = (real_t)log(2.0);
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if (warp) div *= (real_t)1.3;
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return (int32_t)(bands * log((float)a1/(float)a0)/div + 0.5);
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}
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/*
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version for bs_freq_scale > 0
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*/
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void master_frequency_table(sbr_info *sbr, uint8_t k0, uint8_t k2,
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uint8_t bs_freq_scale, uint8_t bs_alter_scale)
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{
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uint8_t k, bands, twoRegions;
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uint8_t k1;
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uint32_t nrBand0, nrBand1;
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int32_t vDk0[64], vDk1[64];
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int32_t vk0[64], vk1[64];
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uint8_t temp1[] = { 6, 5, 4 };
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/* without memset code enters infinite loop,
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so there must be some wrong table access */
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memset(vDk0, 0, 64*sizeof(int32_t));
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memset(vDk1, 0, 64*sizeof(int32_t));
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memset(vk0, 0, 64*sizeof(int32_t));
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memset(vk1, 0, 64*sizeof(int32_t));
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/* mft only defined for k2 > k0 */
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if (k2 <= k0)
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{
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sbr->N_master = 0;
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return;
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}
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bands = temp1[bs_freq_scale-1];
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if ((float)k2/(float)k0 > 2.2449)
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{
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twoRegions = 1;
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k1 = k0 << 1;
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} else {
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twoRegions = 0;
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k1 = k2;
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}
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nrBand0 = 2 * find_bands(0, bands, k0, k1);
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nrBand0 = min(nrBand0, 63);
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for (k = 0; k <= nrBand0; k++)
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{
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/* diverging power series */
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vDk0[k] = (int32_t)(k0 * pow((float)k1/(float)k0, (k+1)/(float)nrBand0)+0.5) -
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(int32_t)(k0 * pow((float)k1/(float)k0, k/(float)nrBand0)+0.5);
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}
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/* needed? */
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qsort(vDk0, nrBand0, sizeof(vDk0[0]), longcmp);
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vk0[0] = k0;
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for (k = 1; k <= nrBand0; k++)
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{
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vk0[k] = vk0[k-1] + vDk0[k-1];
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}
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if (!twoRegions)
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{
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for (k = 0; k <= nrBand0; k++)
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sbr->f_master[k] = vk0[k];
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sbr->N_master = nrBand0;
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sbr->N_master = min(sbr->N_master, 64);
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return;
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}
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nrBand1 = 2 * find_bands(1 /* warped */, bands, k1, k2);
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nrBand1 = min(nrBand1, 63);
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for (k = 0; k <= nrBand1 - 1; k++)
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{
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vDk1[k] = (int32_t)(k1 * pow((float)k2/(float)k1, (k+1)/(float)nrBand1)+0.5) -
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(int32_t)(k1 * pow((float)k2/(float)k1, k/(float)nrBand1)+0.5);
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}
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if (vDk1[0] < vDk0[nrBand0 - 1])
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{
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int32_t change;
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/* needed? */
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qsort(vDk1, nrBand1 + 1, sizeof(vDk1[0]), longcmp);
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change = vDk0[nrBand0 - 1] - vDk1[0];
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vDk1[0] = vDk0[nrBand0 - 1];
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vDk1[nrBand1 - 1] = vDk1[nrBand1 - 1] - change;
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}
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/* needed? */
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qsort(vDk1, nrBand1, sizeof(vDk1[0]), longcmp);
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vk1[0] = k1;
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for (k = 1; k <= nrBand1; k++)
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{
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vk1[k] = vk1[k-1] + vDk1[k-1];
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}
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sbr->N_master = nrBand0 + nrBand1;
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sbr->N_master = min(sbr->N_master, 64);
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for (k = 0; k <= nrBand0; k++)
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{
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sbr->f_master[k] = vk0[k];
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}
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for (k = nrBand0 + 1; k <= sbr->N_master; k++)
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{
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sbr->f_master[k] = vk1[k - nrBand0];
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}
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#if 0
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printf("f_master[%d]: ", sbr->N_master);
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for (k = 0; k <= sbr->N_master; k++)
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{
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printf("%d ", sbr->f_master[k]);
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}
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printf("\n");
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#endif
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}
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/* calculate the derived frequency border tables from f_master */
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uint8_t derived_frequency_table(sbr_info *sbr, uint8_t bs_xover_band,
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uint8_t k2)
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{
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uint8_t k, i;
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uint32_t minus;
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/* The following relation shall be satisfied: bs_xover_band < N_Master */
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if (sbr->N_master <= bs_xover_band)
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return 1;
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sbr->N_high = sbr->N_master - bs_xover_band;
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sbr->N_low = (sbr->N_high>>1) + (sbr->N_high - ((sbr->N_high>>1)<<1));
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sbr->n[0] = sbr->N_low;
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sbr->n[1] = sbr->N_high;
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for (k = 0; k <= sbr->N_high; k++)
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{
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sbr->f_table_res[HI_RES][k] = sbr->f_master[k + bs_xover_band];
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}
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sbr->M = sbr->f_table_res[HI_RES][sbr->N_high] - sbr->f_table_res[HI_RES][0];
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sbr->kx = sbr->f_table_res[HI_RES][0];
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minus = (sbr->N_high & 1) ? 1 : 0;
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for (k = 0; k <= sbr->N_low; k++)
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{
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if (k == 0)
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i = 0;
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else
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i = 2*k - minus;
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sbr->f_table_res[LO_RES][k] = sbr->f_table_res[HI_RES][i];
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}
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#if 0
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printf("f_table_res[HI_RES][%d]: ", sbr->N_high);
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for (k = 0; k <= sbr->N_high; k++)
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{
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printf("%d ", sbr->f_table_res[HI_RES][k]);
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}
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printf("\n");
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#endif
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#if 0
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printf("f_table_res[LO_RES][%d]: ", sbr->N_low);
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for (k = 0; k <= sbr->N_low; k++)
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{
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printf("%d ", sbr->f_table_res[LO_RES][k]);
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}
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printf("\n");
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#endif
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sbr->N_Q = 0;
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if (sbr->bs_noise_bands == 0)
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{
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sbr->N_Q = 1;
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} else {
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#if 0
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sbr->N_Q = max(1, (int32_t)(sbr->bs_noise_bands*(log(k2/(float)sbr->kx)/log(2.0)) + 0.5));
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#else
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sbr->N_Q = max(1, find_bands(0, sbr->bs_noise_bands, sbr->kx, k2));
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#endif
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sbr->N_Q = min(5, sbr->N_Q);
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}
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for (k = 0; k <= sbr->N_Q; k++)
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{
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if (k == 0)
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{
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i = 0;
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} else { /* is this accurate? */
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//i = i + (int32_t)((sbr->N_low - i)/(sbr->N_Q + 1 - k));
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i = i + (sbr->N_low - i)/(sbr->N_Q + 1 - k);
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}
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sbr->f_table_noise[k] = sbr->f_table_res[LO_RES][i];
|
|
}
|
|
|
|
/* build table for mapping k to g in hf patching */
|
|
for (k = 0; k < 64; k++)
|
|
{
|
|
uint8_t g;
|
|
for (g = 0; g < sbr->N_Q; g++)
|
|
{
|
|
if ((sbr->f_table_noise[g] <= k) &&
|
|
(k < sbr->f_table_noise[g+1]))
|
|
{
|
|
sbr->table_map_k_to_g[k] = g;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
printf("f_table_noise[%d]: ", sbr->N_Q);
|
|
for (k = 0; k <= sbr->N_Q; k++)
|
|
{
|
|
printf("%d ", sbr->f_table_noise[k]);
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* TODO: blegh, ugly */
|
|
/* Modified to calculate for all possible bs_limiter_bands always
|
|
* This reduces the number calls to this functions needed (now only on
|
|
* header reset)
|
|
*/
|
|
void limiter_frequency_table(sbr_info *sbr)
|
|
{
|
|
#if 0
|
|
static const real_t limiterBandsPerOctave[] = { REAL_CONST(1.2),
|
|
REAL_CONST(2), REAL_CONST(3) };
|
|
#else
|
|
static const real_t limiterBandsCompare[] = { REAL_CONST(1.328125),
|
|
REAL_CONST(1.1875), REAL_CONST(1.125) };
|
|
#endif
|
|
uint8_t k, s;
|
|
int8_t nrLim;
|
|
int32_t limTable[100 /*TODO*/];
|
|
uint8_t patchBorders[64/*??*/];
|
|
#if 0
|
|
real_t limBands;
|
|
#endif
|
|
|
|
sbr->f_table_lim[0][0] = sbr->f_table_res[LO_RES][0] - sbr->kx;
|
|
sbr->f_table_lim[0][1] = sbr->f_table_res[LO_RES][sbr->N_low] - sbr->kx;
|
|
sbr->N_L[0] = 1;
|
|
|
|
for (s = 1; s < 4; s++)
|
|
{
|
|
memset(limTable, 0, 100*sizeof(int32_t));
|
|
|
|
#if 0
|
|
limBands = limiterBandsPerOctave[s - 1];
|
|
#endif
|
|
|
|
patchBorders[0] = sbr->kx;
|
|
for (k = 1; k <= sbr->noPatches; k++)
|
|
{
|
|
patchBorders[k] = patchBorders[k-1] + sbr->patchNoSubbands[k-1];
|
|
}
|
|
|
|
for (k = 0; k <= sbr->N_low; k++)
|
|
{
|
|
limTable[k] = sbr->f_table_res[LO_RES][k];
|
|
}
|
|
for (k = 1; k < sbr->noPatches; k++)
|
|
{
|
|
limTable[k+sbr->N_low] = patchBorders[k];
|
|
}
|
|
|
|
/* needed */
|
|
qsort(limTable, sbr->noPatches + sbr->N_low, sizeof(limTable[0]), longcmp);
|
|
k = 1;
|
|
nrLim = sbr->noPatches + sbr->N_low - 1;
|
|
|
|
if (nrLim < 0) // TODO: BIG FAT PROBLEM
|
|
return;
|
|
|
|
restart:
|
|
if (k <= nrLim)
|
|
{
|
|
real_t nOctaves;
|
|
|
|
if (limTable[k-1] != 0)
|
|
#if 0
|
|
nOctaves = REAL_CONST(log((float)limTable[k]/(float)limTable[k-1])/log(2.0));
|
|
#endif
|
|
nOctaves = (real_t)limTable[k]/(real_t)limTable[k-1];
|
|
else
|
|
nOctaves = 0;
|
|
|
|
#if 0
|
|
if ((MUL(nOctaves,limBands)) < REAL_CONST(0.49))
|
|
#else
|
|
if (nOctaves < limiterBandsCompare[s - 1])
|
|
#endif
|
|
{
|
|
uint8_t i;
|
|
if (limTable[k] != limTable[k-1])
|
|
{
|
|
uint8_t found = 0, found2 = 0;
|
|
for (i = 0; i <= sbr->noPatches; i++)
|
|
{
|
|
if (limTable[k] == patchBorders[i])
|
|
found = 1;
|
|
}
|
|
if (found)
|
|
{
|
|
found2 = 0;
|
|
for (i = 0; i <= sbr->noPatches; i++)
|
|
{
|
|
if (limTable[k-1] == patchBorders[i])
|
|
found2 = 1;
|
|
}
|
|
if (found2)
|
|
{
|
|
k++;
|
|
goto restart;
|
|
} else {
|
|
/* remove (k-1)th element */
|
|
limTable[k-1] = sbr->f_table_res[LO_RES][sbr->N_low];
|
|
qsort(limTable, sbr->noPatches + sbr->N_low, sizeof(limTable[0]), longcmp);
|
|
nrLim--;
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
/* remove kth element */
|
|
limTable[k] = sbr->f_table_res[LO_RES][sbr->N_low];
|
|
qsort(limTable, nrLim, sizeof(limTable[0]), longcmp);
|
|
nrLim--;
|
|
goto restart;
|
|
} else {
|
|
k++;
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
sbr->N_L[s] = nrLim;
|
|
for (k = 0; k <= nrLim; k++)
|
|
{
|
|
sbr->f_table_lim[s][k] = limTable[k] - sbr->kx;
|
|
}
|
|
|
|
#if 0
|
|
printf("f_table_lim[%d][%d]: ", s, sbr->N_L[s]);
|
|
for (k = 0; k <= sbr->N_L[s]; k++)
|
|
{
|
|
printf("%d ", sbr->f_table_lim[s][k]);
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#endif
|