mirror of
https://github.com/mpv-player/mpv
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e24087509a
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10990 b3059339-0415-0410-9bf9-f77b7e298cf2
620 lines
19 KiB
C
620 lines
19 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: specrec.c,v 1.27 2003/09/30 12:43:05 menno Exp $
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**/
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/*
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Spectral reconstruction:
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- grouping/sectioning
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- inverse quantization
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- applying scalefactors
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*/
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#include "common.h"
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#include "structs.h"
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#include <string.h>
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#include "specrec.h"
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#include "syntax.h"
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#include "iq_table.h"
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#ifdef LD_DEC
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static uint8_t num_swb_512_window[] =
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{
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0, 0, 0, 36, 36, 37, 31, 31, 0, 0, 0, 0
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};
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static uint8_t num_swb_480_window[] =
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{
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0, 0, 0, 35, 35, 37, 30, 30, 0, 0, 0, 0
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};
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#endif
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static uint8_t num_swb_960_window[] =
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{
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40, 40, 45, 49, 49, 49, 46, 46, 42, 42, 42, 40
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};
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static uint8_t num_swb_1024_window[] =
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{
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41, 41, 47, 49, 49, 51, 47, 47, 43, 43, 43, 40
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};
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static uint8_t num_swb_128_window[] =
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{
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12, 12, 12, 14, 14, 14, 15, 15, 15, 15, 15, 15
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};
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static uint16_t swb_offset_1024_96[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56,
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64, 72, 80, 88, 96, 108, 120, 132, 144, 156, 172, 188, 212, 240,
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276, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896, 960, 1024
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};
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static uint16_t swb_offset_128_96[] =
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{
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0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
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};
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static uint16_t swb_offset_1024_64[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56,
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64, 72, 80, 88, 100, 112, 124, 140, 156, 172, 192, 216, 240, 268,
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304, 344, 384, 424, 464, 504, 544, 584, 624, 664, 704, 744, 784, 824,
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864, 904, 944, 984, 1024
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};
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static uint16_t swb_offset_128_64[] =
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{
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0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
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};
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static uint16_t swb_offset_1024_48[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 48, 56, 64, 72,
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80, 88, 96, 108, 120, 132, 144, 160, 176, 196, 216, 240, 264, 292,
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320, 352, 384, 416, 448, 480, 512, 544, 576, 608, 640, 672, 704, 736,
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768, 800, 832, 864, 896, 928, 1024
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};
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#ifdef LD_DEC
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static uint16_t swb_offset_512_48[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 68, 76, 84,
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92, 100, 112, 124, 136, 148, 164, 184, 208, 236, 268, 300, 332, 364, 396,
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428, 460, 512
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};
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static uint16_t swb_offset_480_48[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 72 ,80 ,88,
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96, 108, 120, 132, 144, 156, 172, 188, 212, 240, 272, 304, 336, 368, 400,
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432, 480
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};
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#endif
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static uint16_t swb_offset_128_48[] =
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{
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0, 4, 8, 12, 16, 20, 28, 36, 44, 56, 68, 80, 96, 112, 128
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};
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static uint16_t swb_offset_1024_32[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 48, 56, 64, 72,
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80, 88, 96, 108, 120, 132, 144, 160, 176, 196, 216, 240, 264, 292,
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320, 352, 384, 416, 448, 480, 512, 544, 576, 608, 640, 672, 704, 736,
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768, 800, 832, 864, 896, 928, 960, 992, 1024
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};
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#ifdef LD_DEC
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static uint16_t swb_offset_512_32[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 72, 80,
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88, 96, 108, 120, 132, 144, 160, 176, 192, 212, 236, 260, 288, 320, 352,
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384, 416, 448, 480, 512
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};
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static uint16_t swb_offset_480_32[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 72, 80,
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88, 96, 104, 112, 124, 136, 148, 164, 180, 200, 224, 256, 288, 320, 352,
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384, 416, 448, 480
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};
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#endif
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static uint16_t swb_offset_1024_24[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 52, 60, 68,
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76, 84, 92, 100, 108, 116, 124, 136, 148, 160, 172, 188, 204, 220,
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240, 260, 284, 308, 336, 364, 396, 432, 468, 508, 552, 600, 652, 704,
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768, 832, 896, 960, 1024
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};
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#ifdef LD_DEC
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static uint16_t swb_offset_512_24[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 52, 60, 68,
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80, 92, 104, 120, 140, 164, 192, 224, 256, 288, 320, 352, 384, 416,
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448, 480, 512
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};
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static uint16_t swb_offset_480_24[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 52, 60, 68, 80, 92, 104, 120,
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140, 164, 192, 224, 256, 288, 320, 352, 384, 416, 448, 480
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};
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#endif
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static uint16_t swb_offset_128_24[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 64, 76, 92, 108, 128
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};
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static uint16_t swb_offset_1024_16[] =
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{
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0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 100, 112, 124,
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136, 148, 160, 172, 184, 196, 212, 228, 244, 260, 280, 300, 320, 344,
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368, 396, 424, 456, 492, 532, 572, 616, 664, 716, 772, 832, 896, 960, 1024
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};
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static uint16_t swb_offset_128_16[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 32, 40, 48, 60, 72, 88, 108, 128
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};
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static uint16_t swb_offset_1024_8[] =
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{
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0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 172,
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188, 204, 220, 236, 252, 268, 288, 308, 328, 348, 372, 396, 420, 448,
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476, 508, 544, 580, 620, 664, 712, 764, 820, 880, 944, 1024
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};
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static uint16_t swb_offset_128_8[] =
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{
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0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 60, 72, 88, 108, 128
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};
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static uint16_t *swb_offset_1024_window[] =
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{
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swb_offset_1024_96, /* 96000 */
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swb_offset_1024_96, /* 88200 */
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swb_offset_1024_64, /* 64000 */
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swb_offset_1024_48, /* 48000 */
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swb_offset_1024_48, /* 44100 */
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swb_offset_1024_32, /* 32000 */
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swb_offset_1024_24, /* 24000 */
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swb_offset_1024_24, /* 22050 */
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swb_offset_1024_16, /* 16000 */
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swb_offset_1024_16, /* 12000 */
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swb_offset_1024_16, /* 11025 */
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swb_offset_1024_8 /* 8000 */
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};
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#ifdef LD_DEC
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static uint16_t *swb_offset_512_window[] =
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{
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0, /* 96000 */
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0, /* 88200 */
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0, /* 64000 */
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swb_offset_512_48, /* 48000 */
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swb_offset_512_48, /* 44100 */
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swb_offset_512_32, /* 32000 */
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swb_offset_512_24, /* 24000 */
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swb_offset_512_24, /* 22050 */
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0, /* 16000 */
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0, /* 12000 */
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0, /* 11025 */
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0 /* 8000 */
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};
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static uint16_t *swb_offset_480_window[] =
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{
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0, /* 96000 */
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0, /* 88200 */
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0, /* 64000 */
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swb_offset_480_48, /* 48000 */
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swb_offset_480_48, /* 44100 */
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swb_offset_480_32, /* 32000 */
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swb_offset_480_24, /* 24000 */
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swb_offset_480_24, /* 22050 */
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0, /* 16000 */
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0, /* 12000 */
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0, /* 11025 */
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0 /* 8000 */
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};
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#endif
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static uint16_t *swb_offset_128_window[] =
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{
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swb_offset_128_96, /* 96000 */
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swb_offset_128_96, /* 88200 */
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swb_offset_128_64, /* 64000 */
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swb_offset_128_48, /* 48000 */
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swb_offset_128_48, /* 44100 */
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swb_offset_128_48, /* 32000 */
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swb_offset_128_24, /* 24000 */
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swb_offset_128_24, /* 22050 */
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swb_offset_128_16, /* 16000 */
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swb_offset_128_16, /* 12000 */
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swb_offset_128_16, /* 11025 */
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swb_offset_128_8 /* 8000 */
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};
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#define bit_set(A, B) ((A) & (1<<(B)))
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/* 4.5.2.3.4 */
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/*
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- determine the number of windows in a window_sequence named num_windows
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- determine the number of window_groups named num_window_groups
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- determine the number of windows in each group named window_group_length[g]
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- determine the total number of scalefactor window bands named num_swb for
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the actual window type
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- determine swb_offset[swb], the offset of the first coefficient in
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scalefactor window band named swb of the window actually used
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- determine sect_sfb_offset[g][section],the offset of the first coefficient
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in section named section. This offset depends on window_sequence and
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scale_factor_grouping and is needed to decode the spectral_data().
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*/
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uint8_t window_grouping_info(faacDecHandle hDecoder, ic_stream *ics)
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{
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uint8_t i, g;
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uint8_t sf_index = hDecoder->sf_index;
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switch (ics->window_sequence) {
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case ONLY_LONG_SEQUENCE:
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case LONG_START_SEQUENCE:
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case LONG_STOP_SEQUENCE:
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ics->num_windows = 1;
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ics->num_window_groups = 1;
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ics->window_group_length[ics->num_window_groups-1] = 1;
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#ifdef LD_DEC
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if (hDecoder->object_type == LD)
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{
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if (hDecoder->frameLength == 512)
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ics->num_swb = num_swb_512_window[sf_index];
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else /* if (hDecoder->frameLength == 480) */
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ics->num_swb = num_swb_480_window[sf_index];
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} else {
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#endif
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if (hDecoder->frameLength == 1024)
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ics->num_swb = num_swb_1024_window[sf_index];
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else /* if (hDecoder->frameLength == 960) */
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ics->num_swb = num_swb_960_window[sf_index];
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#ifdef LD_DEC
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}
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#endif
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/* preparation of sect_sfb_offset for long blocks */
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/* also copy the last value! */
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#ifdef LD_DEC
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if (hDecoder->object_type == LD)
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{
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if (hDecoder->frameLength == 512)
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{
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for (i = 0; i < ics->num_swb; i++)
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{
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ics->sect_sfb_offset[0][i] = swb_offset_512_window[sf_index][i];
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ics->swb_offset[i] = swb_offset_512_window[sf_index][i];
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}
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} else /* if (hDecoder->frameLength == 480) */ {
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for (i = 0; i < ics->num_swb; i++)
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{
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ics->sect_sfb_offset[0][i] = swb_offset_480_window[sf_index][i];
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ics->swb_offset[i] = swb_offset_480_window[sf_index][i];
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}
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}
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ics->sect_sfb_offset[0][ics->num_swb] = hDecoder->frameLength;
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ics->swb_offset[ics->num_swb] = hDecoder->frameLength;
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} else {
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#endif
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for (i = 0; i < ics->num_swb; i++)
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{
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ics->sect_sfb_offset[0][i] = swb_offset_1024_window[sf_index][i];
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ics->swb_offset[i] = swb_offset_1024_window[sf_index][i];
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}
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ics->sect_sfb_offset[0][ics->num_swb] = hDecoder->frameLength;
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ics->swb_offset[ics->num_swb] = hDecoder->frameLength;
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#ifdef LD_DEC
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}
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#endif
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return 0;
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case EIGHT_SHORT_SEQUENCE:
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ics->num_windows = 8;
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ics->num_window_groups = 1;
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ics->window_group_length[ics->num_window_groups-1] = 1;
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ics->num_swb = num_swb_128_window[sf_index];
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for (i = 0; i < ics->num_swb; i++)
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ics->swb_offset[i] = swb_offset_128_window[sf_index][i];
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ics->swb_offset[ics->num_swb] = hDecoder->frameLength/8;
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for (i = 0; i < ics->num_windows-1; i++) {
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if (bit_set(ics->scale_factor_grouping, 6-i) == 0)
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{
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ics->num_window_groups += 1;
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ics->window_group_length[ics->num_window_groups-1] = 1;
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} else {
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ics->window_group_length[ics->num_window_groups-1] += 1;
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}
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}
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/* preparation of sect_sfb_offset for short blocks */
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for (g = 0; g < ics->num_window_groups; g++)
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{
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uint16_t width;
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uint8_t sect_sfb = 0;
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uint16_t offset = 0;
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for (i = 0; i < ics->num_swb; i++)
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{
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if (i+1 == ics->num_swb)
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{
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width = (hDecoder->frameLength/8) - swb_offset_128_window[sf_index][i];
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} else {
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width = swb_offset_128_window[sf_index][i+1] -
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swb_offset_128_window[sf_index][i];
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}
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width *= ics->window_group_length[g];
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ics->sect_sfb_offset[g][sect_sfb++] = offset;
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offset += width;
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}
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ics->sect_sfb_offset[g][sect_sfb] = offset;
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}
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return 0;
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default:
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return 1;
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}
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}
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/*
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For ONLY_LONG_SEQUENCE windows (num_window_groups = 1,
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window_group_length[0] = 1) the spectral data is in ascending spectral
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order.
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For the EIGHT_SHORT_SEQUENCE window, the spectral order depends on the
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grouping in the following manner:
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- Groups are ordered sequentially
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- Within a group, a scalefactor band consists of the spectral data of all
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grouped SHORT_WINDOWs for the associated scalefactor window band. To
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clarify via example, the length of a group is in the range of one to eight
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SHORT_WINDOWs.
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- If there are eight groups each with length one (num_window_groups = 8,
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window_group_length[0..7] = 1), the result is a sequence of eight spectra,
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each in ascending spectral order.
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- If there is only one group with length eight (num_window_groups = 1,
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window_group_length[0] = 8), the result is that spectral data of all eight
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SHORT_WINDOWs is interleaved by scalefactor window bands.
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- Within a scalefactor window band, the coefficients are in ascending
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spectral order.
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*/
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void quant_to_spec(ic_stream *ics, real_t *spec_data, uint16_t frame_len)
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{
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uint8_t g, sfb, win;
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uint16_t width, bin, k, gindex;
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real_t tmp_spec[1024];
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memset(tmp_spec, 0, frame_len*sizeof(real_t));
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k = 0;
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gindex = 0;
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for (g = 0; g < ics->num_window_groups; g++)
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{
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uint16_t j = 0;
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uint16_t gincrease = 0;
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uint16_t win_inc = ics->swb_offset[ics->num_swb];
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for (sfb = 0; sfb < ics->num_swb; sfb++)
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{
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width = ics->swb_offset[sfb+1] - ics->swb_offset[sfb];
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for (win = 0; win < ics->window_group_length[g]; win++)
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{
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for (bin = 0; bin < width; bin += 4)
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{
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tmp_spec[gindex+(win*win_inc)+j+bin+0] = spec_data[k+0];
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tmp_spec[gindex+(win*win_inc)+j+bin+1] = spec_data[k+1];
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tmp_spec[gindex+(win*win_inc)+j+bin+2] = spec_data[k+2];
|
|
tmp_spec[gindex+(win*win_inc)+j+bin+3] = spec_data[k+3];
|
|
gincrease += 4;
|
|
k += 4;
|
|
}
|
|
}
|
|
j += width;
|
|
}
|
|
gindex += gincrease;
|
|
}
|
|
|
|
memcpy(spec_data, tmp_spec, frame_len*sizeof(real_t));
|
|
}
|
|
|
|
#ifndef FIXED_POINT
|
|
void build_tables(real_t *pow2_table)
|
|
{
|
|
uint16_t i;
|
|
|
|
/* build pow(2, 0.25*x) table for scalefactors */
|
|
for(i = 0; i < POW_TABLE_SIZE; i++)
|
|
{
|
|
pow2_table[i] = REAL_CONST(pow(2.0, 0.25 * (i-100)));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static INLINE real_t iquant(int16_t q, real_t *tab)
|
|
{
|
|
#ifdef FIXED_POINT
|
|
int16_t sgn = 1;
|
|
|
|
if (q == 0) return 0;
|
|
|
|
if (q < 0)
|
|
{
|
|
q = -q;
|
|
sgn = -1;
|
|
}
|
|
|
|
if (q >= IQ_TABLE_SIZE)
|
|
return 0; /* sgn * tab[q>>3] * 16; */
|
|
|
|
return sgn * tab[q];
|
|
#else
|
|
int16_t sgn = 1;
|
|
|
|
if (q == 0) return 0;
|
|
|
|
if (q < 0)
|
|
{
|
|
q = -q;
|
|
sgn = -1;
|
|
}
|
|
|
|
if (q < IQ_TABLE_SIZE)
|
|
return sgn * tab[q];
|
|
|
|
return sgn * pow(q, 4./3.);
|
|
#endif
|
|
}
|
|
|
|
void inverse_quantization(real_t *x_invquant, int16_t *x_quant, uint16_t frame_len)
|
|
{
|
|
int16_t i;
|
|
real_t *tab = iq_table;
|
|
|
|
for(i = 0; i < frame_len; i+=4)
|
|
{
|
|
x_invquant[i] = iquant(x_quant[i], tab);
|
|
x_invquant[i+1] = iquant(x_quant[i+1], tab);
|
|
x_invquant[i+2] = iquant(x_quant[i+2], tab);
|
|
x_invquant[i+3] = iquant(x_quant[i+3], tab);
|
|
}
|
|
}
|
|
|
|
#ifndef FIXED_POINT
|
|
static INLINE real_t get_scale_factor_gain(uint16_t scale_factor, real_t *pow2_table)
|
|
{
|
|
if (scale_factor < POW_TABLE_SIZE)
|
|
return pow2_table[scale_factor];
|
|
else
|
|
return REAL_CONST(pow(2.0, 0.25 * (scale_factor - 100)));
|
|
}
|
|
#else
|
|
static real_t pow2_table[] =
|
|
{
|
|
COEF_CONST(0.59460355750136),
|
|
COEF_CONST(0.70710678118655),
|
|
COEF_CONST(0.84089641525371),
|
|
COEF_CONST(1.0),
|
|
COEF_CONST(1.18920711500272),
|
|
COEF_CONST(1.41421356237310),
|
|
COEF_CONST(1.68179283050743)
|
|
};
|
|
#endif
|
|
|
|
void apply_scalefactors(faacDecHandle hDecoder, ic_stream *ics, real_t *x_invquant,
|
|
uint16_t frame_len)
|
|
{
|
|
uint8_t g, sfb;
|
|
uint16_t top;
|
|
#ifndef FIXED_POINT
|
|
real_t scale;
|
|
#else
|
|
int32_t exp, frac;
|
|
#endif
|
|
uint8_t groups = 0;
|
|
uint16_t nshort = frame_len/8;
|
|
|
|
static real_t max_fp = 0;
|
|
static real_t max_exp = 0;
|
|
static real_t max_frac = 0;
|
|
|
|
for (g = 0; g < ics->num_window_groups; g++)
|
|
{
|
|
uint16_t k = 0;
|
|
|
|
/* using this nshort*groups doesn't hurt long blocks, because
|
|
long blocks only have 1 group, so that means 'groups' is
|
|
always 0 for long blocks
|
|
*/
|
|
for (sfb = 0; sfb < ics->max_sfb; sfb++)
|
|
{
|
|
top = ics->sect_sfb_offset[g][sfb+1];
|
|
|
|
#ifndef FIXED_POINT
|
|
scale = get_scale_factor_gain(ics->scale_factors[g][sfb], hDecoder->pow2_table);
|
|
#else
|
|
exp = (ics->scale_factors[g][sfb] - 100) / 4;
|
|
frac = (ics->scale_factors[g][sfb] - 100) % 4;
|
|
|
|
/* IMDCT pre-scaling */
|
|
if (hDecoder->object_type == LD)
|
|
{
|
|
exp -= 6 /*9*/;
|
|
} else {
|
|
if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
|
|
exp -= 4 /*7*/;
|
|
else
|
|
exp -= 7 /*10*/;
|
|
}
|
|
#endif
|
|
|
|
/* minimum size of a sf band is 4 and always a multiple of 4 */
|
|
for ( ; k < top; k += 4)
|
|
{
|
|
#ifndef FIXED_POINT
|
|
x_invquant[k+(groups*nshort)] = x_invquant[k+(groups*nshort)] * scale;
|
|
x_invquant[k+(groups*nshort)+1] = x_invquant[k+(groups*nshort)+1] * scale;
|
|
x_invquant[k+(groups*nshort)+2] = x_invquant[k+(groups*nshort)+2] * scale;
|
|
x_invquant[k+(groups*nshort)+3] = x_invquant[k+(groups*nshort)+3] * scale;
|
|
#else
|
|
if (exp < 0)
|
|
{
|
|
x_invquant[k+(groups*nshort)] >>= -exp;
|
|
x_invquant[k+(groups*nshort)+1] >>= -exp;
|
|
x_invquant[k+(groups*nshort)+2] >>= -exp;
|
|
x_invquant[k+(groups*nshort)+3] >>= -exp;
|
|
} else {
|
|
x_invquant[k+(groups*nshort)] <<= exp;
|
|
x_invquant[k+(groups*nshort)+1] <<= exp;
|
|
x_invquant[k+(groups*nshort)+2] <<= exp;
|
|
x_invquant[k+(groups*nshort)+3] <<= exp;
|
|
}
|
|
|
|
if (frac)
|
|
{
|
|
x_invquant[k+(groups*nshort)] = MUL_R_C(x_invquant[k+(groups*nshort)],pow2_table[frac + 3]);
|
|
x_invquant[k+(groups*nshort)+1] = MUL_R_C(x_invquant[k+(groups*nshort)+1],pow2_table[frac + 3]);
|
|
x_invquant[k+(groups*nshort)+2] = MUL_R_C(x_invquant[k+(groups*nshort)+2],pow2_table[frac + 3]);
|
|
x_invquant[k+(groups*nshort)+3] = MUL_R_C(x_invquant[k+(groups*nshort)+3],pow2_table[frac + 3]);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
groups += ics->window_group_length[g];
|
|
}
|
|
}
|