mirror of https://github.com/VDR4Arch/vdr.git
432 lines
11 KiB
C
432 lines
11 KiB
C
/*
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* coeff.c
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*
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* Copyright (C) Aaron Holtzman - May 1999
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*
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* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
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*
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* ac3dec 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, or (at your option)
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* any later version.
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*
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* ac3dec 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 GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "ac3.h"
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#include "ac3_internal.h"
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#include "bitstream.h"
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#include "dither.h"
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#include "coeff.h"
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//
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//Lookup tables of 0.15 two's complement quantization values
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//
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#define Q0 ((-2 << 15) / 3.0)
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#define Q1 (0)
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#define Q2 ((2 << 15) / 3.0)
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static const float q_1_0[ 32 ] =
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{
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Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
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Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
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Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
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0,0,0,0,0
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};
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static const float q_1_1[ 32 ] =
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{
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Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
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Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
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Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
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0,0,0,0,0
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};
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static const float q_1_2[ 32 ] =
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{
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Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
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Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
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Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
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0,0,0,0,0
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};
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#undef Q0
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#undef Q1
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#undef Q2
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#define Q0 ((-4 << 15) / 5.0)
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#define Q1 ((-2 << 15) / 5.0)
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#define Q2 (0)
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#define Q3 ((2 << 15) / 5.0)
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#define Q4 ((4 << 15) / 5.0)
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static const float q_2_0[ 128 ] =
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{
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Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
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Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
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Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
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Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
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Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
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Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
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Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,
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Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,
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Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,
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Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,
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0,0,0
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};
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static const float q_2_1[ 128 ] =
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{
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Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,
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Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,
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Q4,Q4,Q4,Q4,Q4,Q0,Q0,Q0,Q0,Q0,
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Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,
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Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
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Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,
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Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,
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Q4,Q4,Q4,Q4,Q4,Q0,Q0,Q0,Q0,Q0,
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Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,
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Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
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Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,
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Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,
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Q4,Q4,Q4,Q4,Q4,0,0,0
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};
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static const float q_2_2[ 128 ] =
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{
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
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Q0,Q1,Q2,Q3,Q4,0,0,0
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};
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#undef Q0
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#undef Q1
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#undef Q2
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#undef Q3
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#undef Q4
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static const float q_3[7] =
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{
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(-6 << 15)/7.0, (-4 << 15)/7.0, (-2 << 15)/7.0, 0.0,
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( 2 << 15)/7.0, ( 4 << 15)/7.0, ( 6 << 15)/7.0
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};
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#define Q0 ((-10 << 15) / 11.0)
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#define Q1 ((-8 << 15) / 11.0)
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#define Q2 ((-6 << 15) / 11.0)
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#define Q3 ((-4 << 15) / 11.0)
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#define Q4 ((-2 << 15) / 11.0)
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#define Q5 (0)
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#define Q6 ((2 << 15) / 11.0)
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#define Q7 ((4 << 15) / 11.0)
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#define Q8 ((6 << 15) / 11.0)
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#define Q9 ((8 << 15) / 11.0)
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#define QA ((10 << 15) / 11.0)
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static const float q_4_0[ 128 ] =
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{
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Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0,
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Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1,
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Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2,
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Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3,
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Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4,
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Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5,
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Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6,
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Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7,
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Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8,
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Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9,
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QA, QA, QA, QA, QA, QA, QA, QA, QA, QA, QA,
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0, 0, 0, 0, 0, 0, 0
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};
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static const float q_4_1[ 128 ] =
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{
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
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0, 0, 0, 0, 0, 0, 0
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};
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#undef Q0
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#undef Q1
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#undef Q2
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#undef Q3
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#undef Q4
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#undef Q5
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#undef Q6
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#undef Q7
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#undef Q8
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#undef Q9
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#undef QA
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static const float q_5[15] =
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{
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(-14 << 15)/15.0,(-12 << 15)/15.0,(-10 << 15)/15.0,
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( -8 << 15)/15.0,( -6 << 15)/15.0,( -4 << 15)/15.0,
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( -2 << 15)/15.0, 0.0 ,( 2 << 15)/15.0,
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( 4 << 15)/15.0,( 6 << 15)/15.0,( 8 << 15)/15.0,
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( 10 << 15)/15.0,( 12 << 15)/15.0,( 14 << 15)/15.0
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};
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//
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// Scale factors for convert_to_float
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//
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static const uint32_t u32_scale_factors[25] =
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{
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0x38000000, //2 ^ -(0 + 15)
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0x37800000, //2 ^ -(1 + 15)
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0x37000000, //2 ^ -(2 + 15)
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0x36800000, //2 ^ -(3 + 15)
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0x36000000, //2 ^ -(4 + 15)
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0x35800000, //2 ^ -(5 + 15)
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0x35000000, //2 ^ -(6 + 15)
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0x34800000, //2 ^ -(7 + 15)
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0x34000000, //2 ^ -(8 + 15)
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0x33800000, //2 ^ -(9 + 15)
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0x33000000, //2 ^ -(10 + 15)
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0x32800000, //2 ^ -(11 + 15)
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0x32000000, //2 ^ -(12 + 15)
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0x31800000, //2 ^ -(13 + 15)
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0x31000000, //2 ^ -(14 + 15)
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0x30800000, //2 ^ -(15 + 15)
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0x30000000, //2 ^ -(16 + 15)
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0x2f800000, //2 ^ -(17 + 15)
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0x2f000000, //2 ^ -(18 + 15)
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0x2e800000, //2 ^ -(19 + 15)
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0x2e000000, //2 ^ -(20 + 15)
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0x2d800000, //2 ^ -(21 + 15)
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0x2d000000, //2 ^ -(22 + 15)
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0x2c800000, //2 ^ -(23 + 15)
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0x2c000000 //2 ^ -(24 + 15)
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};
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static float *scale_factor = (float*)u32_scale_factors;
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//These store the persistent state of the packed mantissas
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static float q_1[2];
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static float q_2[2];
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static float q_4[1];
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static int32_t q_1_pointer;
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static int32_t q_2_pointer;
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static int32_t q_4_pointer;
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static float __inline__
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coeff_get_float(uint16_t bap, uint16_t dithflag, uint16_t exp);
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//Conversion from bap to number of bits in the mantissas
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//zeros account for cases 0,1,2,4 which are special cased
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static uint16_t qnttztab[16] =
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{
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0, 0, 0, 3,
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0, 4, 5, 6,
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7, 8, 9, 10,
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11, 12, 14, 16
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};
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static void coeff_reset(void);
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static float coeff_get_float(uint16_t bap, uint16_t dithflag, uint16_t exp);
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static void coeff_uncouple_ch(float samples[],bsi_t *bsi,audblk_t *audblk,uint32_t ch);
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void coeff_unpack(bsi_t *bsi, audblk_t *audblk, stream_samples_t samples)
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{
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uint16_t i,j;
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uint32_t done_cpl = 0;
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coeff_reset();
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for(i=0; i< bsi->nfchans; i++) {
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for(j=0; j < audblk->endmant[i]; j++)
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samples[i][j] = coeff_get_float(audblk->fbw_bap[i][j], audblk->dithflag[i], audblk->fbw_exp[i][j]);
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if(audblk->cplinu && audblk->chincpl[i] && !(done_cpl)) {
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// ncplmant is equal to 12 * ncplsubnd
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// Don't dither coupling channel until channel
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// separation so that interchannel noise is uncorrelated
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for(j=audblk->cplstrtmant; j < audblk->cplendmant; j++)
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audblk->cpl_flt[j] = coeff_get_float(audblk->cpl_bap[j],0, audblk->cpl_exp[j]);
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done_cpl = 1;
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}
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}
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//uncouple the channel if necessary
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if(audblk->cplinu) {
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for(i=0; i< bsi->nfchans; i++) {
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if(audblk->chincpl[i])
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coeff_uncouple_ch(samples[i],bsi,audblk,i);
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}
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}
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if(bsi->lfeon) {
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// There are always 7 mantissas for lfe, no dither for lfe
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for(j=0; j < 7 ; j++)
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samples[5][j] = coeff_get_float(audblk->lfe_bap[j], 0, audblk->lfe_exp[j]);
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}
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}
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/**
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* Fetch a float from the bitstream
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**/
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static float inline coeff_get_float (uint16_t bap, uint16_t dithflag, uint16_t exp)
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{
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uint16_t dummy = 0;
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//If the bap is 0-5 then we have special cases to take care of
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switch(bap) {
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case 0:
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if(dithflag)
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return (dither_gen() * scale_factor[exp]);
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return 0.0;
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case 1:
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if (q_1_pointer >= 0)
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return(q_1[q_1_pointer--] * scale_factor[exp]);
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if ((dummy = bitstream_get (5)) > 26)
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goto error;
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q_1[1] = q_1_1[dummy];
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q_1[0] = q_1_2[dummy];
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q_1_pointer = 1;
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return (q_1_0[dummy] * scale_factor[exp]);
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case 2:
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if(q_2_pointer >= 0)
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return (q_2[q_2_pointer--] * scale_factor[exp]);
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if ((dummy = bitstream_get (7)) > 124)
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goto error;
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q_2[1] = q_2_1[dummy];
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q_2[0] = q_2_2[dummy];
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q_2_pointer = 1;
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return (q_2_0[dummy] * scale_factor[exp]);
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case 3:
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if ((dummy = bitstream_get (3)) > 6)
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goto error;
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return (q_3[dummy] * scale_factor[exp]);
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case 4:
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if(q_4_pointer >= 0)
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return (q_4[q_4_pointer--] * scale_factor[exp]);
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if ((dummy = bitstream_get (7)) > 120)
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goto error;
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q_4[0] = q_4_1[dummy];
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q_4_pointer = 0;
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return (q_4_0[dummy] * scale_factor[exp]);
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case 5:
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if ((dummy = bitstream_get (4)) > 14)
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goto error;
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return (q_5[dummy] * scale_factor[exp]);
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default:
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dummy = bitstream_get(qnttztab[bap]);
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dummy <<= 16 - qnttztab[bap];
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return ((int16_t)dummy * scale_factor[exp]);
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}
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error:
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#ifdef DEBUG
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fprintf(stderr,"** Invalid mantissa - skipping frame **\n");
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#endif
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HANDLE_ERROR();
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}
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/**
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* Reset the mantissa state
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**/
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static void coeff_reset(void)
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{
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q_1_pointer = q_2_pointer = q_4_pointer = -1;
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}
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/**
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* Uncouple the coupling channel into a fbw channel
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**/
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static void coeff_uncouple_ch (float samples[],bsi_t *bsi,audblk_t *audblk,uint32_t ch)
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{
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uint32_t bnd = 0;
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uint32_t sub_bnd = 0;
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uint32_t i,j;
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float cpl_coord = 1.0;
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uint32_t cpl_exp_tmp;
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uint32_t cpl_mant_tmp;
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for (i=audblk->cplstrtmant;i<audblk->cplendmant;) {
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if (!audblk->cplbndstrc[sub_bnd++]) {
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cpl_exp_tmp = audblk->cplcoexp[ch][bnd] + 3 * audblk->mstrcplco[ch];
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if (audblk->cplcoexp[ch][bnd] == 15)
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cpl_mant_tmp = (audblk->cplcomant[ch][bnd]) << 11;
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else
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cpl_mant_tmp = ((0x10) | audblk->cplcomant[ch][bnd]) << 10;
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cpl_coord = (cpl_mant_tmp * scale_factor[cpl_exp_tmp]) * 8.0f;
|
|
|
|
//Invert the phase for the right channel if necessary
|
|
if(bsi->acmod == 0x2 && audblk->phsflginu && ch == 1 && audblk->phsflg[bnd])
|
|
cpl_coord *= -1;
|
|
|
|
bnd++;
|
|
}
|
|
|
|
for(j=0;j < 12; j++) {
|
|
// Get new dither values for each channel if necessary,
|
|
// so the channels are uncorrelated
|
|
if(audblk->dithflag[ch] && !audblk->cpl_bap[i])
|
|
samples[i] = cpl_coord * (dither_gen() * scale_factor[audblk->cpl_exp[i]]);
|
|
else
|
|
samples[i] = cpl_coord * audblk->cpl_flt[i];
|
|
|
|
i++;
|
|
}
|
|
}
|
|
}
|