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rockbox/apps/codecs/libmad/layer3.c
Michael Giacomelli 0e53651062 Force alignment of various data structures in libmad. Speeds up Gigabeat S decoding by about 1MHz. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28639 a1c6a512-1295-4272-9138-f99709370657
2010-11-22 02:51:13 +00:00

3107 lines
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/*
* libmad - MPEG audio decoder library
* Copyright (C) 2000-2004 Underbit Technologies, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id$
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include <string.h>
# ifdef HAVE_ASSERT_H
# include <assert.h>
# endif
# ifdef HAVE_LIMITS_H
# include <limits.h>
# else
# undef CHAR_BIT
# define CHAR_BIT 8
# endif
# include "fixed.h"
# include "bit.h"
# include "stream.h"
# include "frame.h"
# include "huffman.h"
# include "layer3.h"
/* depending on the cpu "leftshift32" may be supported or not */
# if defined(CPU_COLDFIRE)
#define MAXLSHIFT 32
#else
#define MAXLSHIFT 31
#endif
/* --- Layer III ----------------------------------------------------------- */
enum {
count1table_select = 0x01,
scalefac_scale = 0x02,
preflag = 0x04,
mixed_block_flag = 0x08
};
enum {
I_STEREO = 0x1,
MS_STEREO = 0x2
};
struct sideinfo {
unsigned int main_data_begin;
unsigned int private_bits;
unsigned char scfsi[2];
struct granule {
struct channel {
/* from side info */
unsigned short part2_3_length;
unsigned short big_values;
unsigned short global_gain;
unsigned short scalefac_compress;
unsigned char flags;
unsigned char block_type;
unsigned char table_select[3];
unsigned char subblock_gain[3];
unsigned char region0_count;
unsigned char region1_count;
/* from main_data */
unsigned char scalefac[39]; /* scalefac_l and/or scalefac_s */
} ch[2];
} gr[2];
};
/*
* scalefactor bit lengths
* derived from section 2.4.2.7 of ISO/IEC 11172-3
*/
static
struct {
unsigned char slen1;
unsigned char slen2;
} const sflen_table[16] = {
{ 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 },
{ 3, 0 }, { 1, 1 }, { 1, 2 }, { 1, 3 },
{ 2, 1 }, { 2, 2 }, { 2, 3 }, { 3, 1 },
{ 3, 2 }, { 3, 3 }, { 4, 2 }, { 4, 3 }
};
/*
* number of LSF scalefactor band values
* derived from section 2.4.3.2 of ISO/IEC 13818-3
*/
static
unsigned char const nsfb_table[6][3][4] = {
{ { 6, 5, 5, 5 },
{ 9, 9, 9, 9 },
{ 6, 9, 9, 9 } },
{ { 6, 5, 7, 3 },
{ 9, 9, 12, 6 },
{ 6, 9, 12, 6 } },
{ { 11, 10, 0, 0 },
{ 18, 18, 0, 0 },
{ 15, 18, 0, 0 } },
{ { 7, 7, 7, 0 },
{ 12, 12, 12, 0 },
{ 6, 15, 12, 0 } },
{ { 6, 6, 6, 3 },
{ 12, 9, 9, 6 },
{ 6, 12, 9, 6 } },
{ { 8, 8, 5, 0 },
{ 15, 12, 9, 0 },
{ 6, 18, 9, 0 } }
};
/*
* MPEG-1 scalefactor band widths
* derived from Table B.8 of ISO/IEC 11172-3
*/
static
unsigned char const sfb_48000_long[] = {
4, 4, 4, 4, 4, 4, 6, 6, 6, 8, 10,
12, 16, 18, 22, 28, 34, 40, 46, 54, 54, 192
};
static
unsigned char const sfb_44100_long[] = {
4, 4, 4, 4, 4, 4, 6, 6, 8, 8, 10,
12, 16, 20, 24, 28, 34, 42, 50, 54, 76, 158
};
static
unsigned char const sfb_32000_long[] = {
4, 4, 4, 4, 4, 4, 6, 6, 8, 10, 12,
16, 20, 24, 30, 38, 46, 56, 68, 84, 102, 26
};
static
unsigned char const sfb_48000_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
6, 6, 6, 6, 6, 10, 10, 10, 12, 12, 12, 14, 14,
14, 16, 16, 16, 20, 20, 20, 26, 26, 26, 66, 66, 66
};
static
unsigned char const sfb_44100_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
6, 6, 8, 8, 8, 10, 10, 10, 12, 12, 12, 14, 14,
14, 18, 18, 18, 22, 22, 22, 30, 30, 30, 56, 56, 56
};
static
unsigned char const sfb_32000_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6,
6, 6, 8, 8, 8, 12, 12, 12, 16, 16, 16, 20, 20,
20, 26, 26, 26, 34, 34, 34, 42, 42, 42, 12, 12, 12
};
static
unsigned char const sfb_48000_mixed[] = {
/* long */ 4, 4, 4, 4, 4, 4, 6, 6,
/* short */ 4, 4, 4, 6, 6, 6, 6, 6, 6, 10,
10, 10, 12, 12, 12, 14, 14, 14, 16, 16,
16, 20, 20, 20, 26, 26, 26, 66, 66, 66
};
static
unsigned char const sfb_44100_mixed[] = {
/* long */ 4, 4, 4, 4, 4, 4, 6, 6,
/* short */ 4, 4, 4, 6, 6, 6, 8, 8, 8, 10,
10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
18, 22, 22, 22, 30, 30, 30, 56, 56, 56
};
static
unsigned char const sfb_32000_mixed[] = {
/* long */ 4, 4, 4, 4, 4, 4, 6, 6,
/* short */ 4, 4, 4, 6, 6, 6, 8, 8, 8, 12,
12, 12, 16, 16, 16, 20, 20, 20, 26, 26,
26, 34, 34, 34, 42, 42, 42, 12, 12, 12
};
/*
* MPEG-2 scalefactor band widths
* derived from Table B.2 of ISO/IEC 13818-3
*/
static
unsigned char const sfb_24000_long[] = {
6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16,
18, 22, 26, 32, 38, 46, 54, 62, 70, 76, 36
};
static
unsigned char const sfb_22050_long[] = {
6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16,
20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54
};
# define sfb_16000_long sfb_22050_long
static
unsigned char const sfb_24000_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 8,
8, 8, 10, 10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
18, 24, 24, 24, 32, 32, 32, 44, 44, 44, 12, 12, 12
};
static
unsigned char const sfb_22050_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6,
6, 6, 8, 8, 8, 10, 10, 10, 14, 14, 14, 18, 18,
18, 26, 26, 26, 32, 32, 32, 42, 42, 42, 18, 18, 18
};
static
unsigned char const sfb_16000_short[] = {
4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 8,
8, 8, 10, 10, 10, 12, 12, 12, 14, 14, 14, 18, 18,
18, 24, 24, 24, 30, 30, 30, 40, 40, 40, 18, 18, 18
};
static
unsigned char const sfb_24000_mixed[] = {
/* long */ 6, 6, 6, 6, 6, 6,
/* short */ 6, 6, 6, 8, 8, 8, 10, 10, 10, 12,
12, 12, 14, 14, 14, 18, 18, 18, 24, 24,
24, 32, 32, 32, 44, 44, 44, 12, 12, 12
};
static
unsigned char const sfb_22050_mixed[] = {
/* long */ 6, 6, 6, 6, 6, 6,
/* short */ 6, 6, 6, 6, 6, 6, 8, 8, 8, 10,
10, 10, 14, 14, 14, 18, 18, 18, 26, 26,
26, 32, 32, 32, 42, 42, 42, 18, 18, 18
};
static
unsigned char const sfb_16000_mixed[] = {
/* long */ 6, 6, 6, 6, 6, 6,
/* short */ 6, 6, 6, 8, 8, 8, 10, 10, 10, 12,
12, 12, 14, 14, 14, 18, 18, 18, 24, 24,
24, 30, 30, 30, 40, 40, 40, 18, 18, 18
};
/*
* MPEG 2.5 scalefactor band widths
* derived from public sources
*/
# define sfb_12000_long sfb_16000_long
# define sfb_11025_long sfb_12000_long
static
unsigned char const sfb_8000_long[] = {
12, 12, 12, 12, 12, 12, 16, 20, 24, 28, 32,
40, 48, 56, 64, 76, 90, 2, 2, 2, 2, 2
};
# define sfb_12000_short sfb_16000_short
# define sfb_11025_short sfb_12000_short
static
unsigned char const sfb_8000_short[] = {
8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 12, 12, 16,
16, 16, 20, 20, 20, 24, 24, 24, 28, 28, 28, 36, 36,
36, 2, 2, 2, 2, 2, 2, 2, 2, 2, 26, 26, 26
};
# define sfb_12000_mixed sfb_16000_mixed
# define sfb_11025_mixed sfb_12000_mixed
/* the 8000 Hz short block scalefactor bands do not break after
the first 36 frequency lines, so this is probably wrong */
static
unsigned char const sfb_8000_mixed[] = {
/* long */ 12, 12, 12,
/* short */ 4, 4, 4, 8, 8, 8, 12, 12, 12, 16, 16, 16,
20, 20, 20, 24, 24, 24, 28, 28, 28, 36, 36, 36,
2, 2, 2, 2, 2, 2, 2, 2, 2, 26, 26, 26
};
static
struct {
unsigned char const *l;
unsigned char const *s;
unsigned char const *m;
} const sfbwidth_table[9] = {
{ sfb_48000_long, sfb_48000_short, sfb_48000_mixed },
{ sfb_44100_long, sfb_44100_short, sfb_44100_mixed },
{ sfb_32000_long, sfb_32000_short, sfb_32000_mixed },
{ sfb_24000_long, sfb_24000_short, sfb_24000_mixed },
{ sfb_22050_long, sfb_22050_short, sfb_22050_mixed },
{ sfb_16000_long, sfb_16000_short, sfb_16000_mixed },
{ sfb_12000_long, sfb_12000_short, sfb_12000_mixed },
{ sfb_11025_long, sfb_11025_short, sfb_11025_mixed },
{ sfb_8000_long, sfb_8000_short, sfb_8000_mixed }
};
/*
* scalefactor band preemphasis (used only when preflag is set)
* derived from Table B.6 of ISO/IEC 11172-3
*/
static
unsigned char const pretab[22] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0
};
/*
* table for requantization
*
* rq_table[x].mantissa * 2^(rq_table[x].exponent) = x^(4/3)
*
* format rq_table: bit31-27=exponent bit26-0=mantissa
*/
static
unsigned long const rq_table[8207] = {
# include "rq_table.dat"
};
/*
* fractional powers of two
* used for requantization and joint stereo decoding
*
* root_table[3 + x] = 2^(x/4)
*/
mad_fixed_t const root_table[7] ICONST_ATTR MEM_ALIGN_ATTR = {
MAD_F(0x09837f05) /* 2^(-3/4) == 0.59460355750136 */,
MAD_F(0x0b504f33) /* 2^(-2/4) == 0.70710678118655 */,
MAD_F(0x0d744fcd) /* 2^(-1/4) == 0.84089641525371 */,
MAD_F(0x10000000) /* 2^( 0/4) == 1.00000000000000 */,
MAD_F(0x1306fe0a) /* 2^(+1/4) == 1.18920711500272 */,
MAD_F(0x16a09e66) /* 2^(+2/4) == 1.41421356237310 */,
MAD_F(0x1ae89f99) /* 2^(+3/4) == 1.68179283050743 */
};
/*
* coefficients for aliasing reduction
* derived from Table B.9 of ISO/IEC 11172-3
*
* c[] = { -0.6, -0.535, -0.33, -0.185, -0.095, -0.041, -0.0142, -0.0037 }
* cs[i] = 1 / sqrt(1 + c[i]^2)
* ca[i] = c[i] / sqrt(1 + c[i]^2)
*/
mad_fixed_t const cs[8] ICONST_ATTR MEM_ALIGN_ATTR = {
+MAD_F(0x0db84a81) /* +0.857492926 */, +MAD_F(0x0e1b9d7f) /* +0.881741997 */,
+MAD_F(0x0f31adcf) /* +0.949628649 */, +MAD_F(0x0fbba815) /* +0.983314592 */,
+MAD_F(0x0feda417) /* +0.995517816 */, +MAD_F(0x0ffc8fc8) /* +0.999160558 */,
+MAD_F(0x0fff964c) /* +0.999899195 */, +MAD_F(0x0ffff8d3) /* +0.999993155 */
};
mad_fixed_t const ca[8] ICONST_ATTR MEM_ALIGN_ATTR = {
-MAD_F(0x083b5fe7) /* -0.514495755 */, -MAD_F(0x078c36d2) /* -0.471731969 */,
-MAD_F(0x05039814) /* -0.313377454 */, -MAD_F(0x02e91dd1) /* -0.181913200 */,
-MAD_F(0x0183603a) /* -0.094574193 */, -MAD_F(0x00a7cb87) /* -0.040965583 */,
-MAD_F(0x003a2847) /* -0.014198569 */, -MAD_F(0x000f27b4) /* -0.003699975 */
};
/*
* IMDCT coefficients for short blocks
* derived from section 2.4.3.4.10.2 of ISO/IEC 11172-3
*
* imdct_s[i/even][k] = cos((PI / 24) * (2 * (i / 2) + 7) * (2 * k + 1))
* imdct_s[i /odd][k] = cos((PI / 24) * (2 * (6 + (i-1)/2) + 7) * (2 * k + 1))
*/
mad_fixed_t const imdct_s[6][6] ICONST_ATTR MEM_ALIGN_ATTR = {
# include "imdct_s.dat"
};
# if !defined(FPM_ARM)
/*
* windowing coefficients for long blocks
* derived from section 2.4.3.4.10.3 of ISO/IEC 11172-3
*
* window_l[i] = sin((PI / 36) * (i + 1/2))
*/
static
mad_fixed_t const window_l[36] ICONST_ATTR MEM_ALIGN_ATTR = {
MAD_F(0x00b2aa3e) /* 0.043619387 */, MAD_F(0x0216a2a2) /* 0.130526192 */,
MAD_F(0x03768962) /* 0.216439614 */, MAD_F(0x04cfb0e2) /* 0.300705800 */,
MAD_F(0x061f78aa) /* 0.382683432 */, MAD_F(0x07635284) /* 0.461748613 */,
MAD_F(0x0898c779) /* 0.537299608 */, MAD_F(0x09bd7ca0) /* 0.608761429 */,
MAD_F(0x0acf37ad) /* 0.675590208 */, MAD_F(0x0bcbe352) /* 0.737277337 */,
MAD_F(0x0cb19346) /* 0.793353340 */, MAD_F(0x0d7e8807) /* 0.843391446 */,
MAD_F(0x0e313245) /* 0.887010833 */, MAD_F(0x0ec835e8) /* 0.923879533 */,
MAD_F(0x0f426cb5) /* 0.953716951 */, MAD_F(0x0f9ee890) /* 0.976296007 */,
MAD_F(0x0fdcf549) /* 0.991444861 */, MAD_F(0x0ffc19fd) /* 0.999048222 */,
MAD_F(0x0ffc19fd) /* 0.999048222 */, MAD_F(0x0fdcf549) /* 0.991444861 */,
MAD_F(0x0f9ee890) /* 0.976296007 */, MAD_F(0x0f426cb5) /* 0.953716951 */,
MAD_F(0x0ec835e8) /* 0.923879533 */, MAD_F(0x0e313245) /* 0.887010833 */,
MAD_F(0x0d7e8807) /* 0.843391446 */, MAD_F(0x0cb19346) /* 0.793353340 */,
MAD_F(0x0bcbe352) /* 0.737277337 */, MAD_F(0x0acf37ad) /* 0.675590208 */,
MAD_F(0x09bd7ca0) /* 0.608761429 */, MAD_F(0x0898c779) /* 0.537299608 */,
MAD_F(0x07635284) /* 0.461748613 */, MAD_F(0x061f78aa) /* 0.382683432 */,
MAD_F(0x04cfb0e2) /* 0.300705800 */, MAD_F(0x03768962) /* 0.216439614 */,
MAD_F(0x0216a2a2) /* 0.130526192 */, MAD_F(0x00b2aa3e) /* 0.043619387 */,
};
# endif /* FPM_ARM */
/*
* windowing coefficients for short blocks
* derived from section 2.4.3.4.10.3 of ISO/IEC 11172-3
*
* window_s[i] = sin((PI / 12) * (i + 1/2))
*/
mad_fixed_t const window_s[12] ICONST_ATTR MEM_ALIGN_ATTR = {
MAD_F(0x0216a2a2) /* 0.130526192 */, MAD_F(0x061f78aa) /* 0.382683432 */,
MAD_F(0x09bd7ca0) /* 0.608761429 */, MAD_F(0x0cb19346) /* 0.793353340 */,
MAD_F(0x0ec835e8) /* 0.923879533 */, MAD_F(0x0fdcf549) /* 0.991444861 */,
MAD_F(0x0fdcf549) /* 0.991444861 */, MAD_F(0x0ec835e8) /* 0.923879533 */,
MAD_F(0x0cb19346) /* 0.793353340 */, MAD_F(0x09bd7ca0) /* 0.608761429 */,
MAD_F(0x061f78aa) /* 0.382683432 */, MAD_F(0x0216a2a2) /* 0.130526192 */,
};
/*
* coefficients for intensity stereo processing
* derived from section 2.4.3.4.9.3 of ISO/IEC 11172-3
*
* is_ratio[i] = tan(i * (PI / 12))
* is_table[i] = is_ratio[i] / (1 + is_ratio[i])
*/
static
mad_fixed_t const is_table[7] = {
MAD_F(0x00000000) /* 0.000000000 */,
MAD_F(0x0361962f) /* 0.211324865 */,
MAD_F(0x05db3d74) /* 0.366025404 */,
MAD_F(0x08000000) /* 0.500000000 */,
MAD_F(0x0a24c28c) /* 0.633974596 */,
MAD_F(0x0c9e69d1) /* 0.788675135 */,
MAD_F(0x10000000) /* 1.000000000 */
};
/*
* coefficients for LSF intensity stereo processing
* derived from section 2.4.3.2 of ISO/IEC 13818-3
*
* is_lsf_table[0][i] = (1 / sqrt(sqrt(2)))^(i + 1)
* is_lsf_table[1][i] = (1 / sqrt(2)) ^(i + 1)
*/
static
mad_fixed_t const is_lsf_table[2][15] = {
{
MAD_F(0x0d744fcd) /* 0.840896415 */,
MAD_F(0x0b504f33) /* 0.707106781 */,
MAD_F(0x09837f05) /* 0.594603558 */,
MAD_F(0x08000000) /* 0.500000000 */,
MAD_F(0x06ba27e6) /* 0.420448208 */,
MAD_F(0x05a8279a) /* 0.353553391 */,
MAD_F(0x04c1bf83) /* 0.297301779 */,
MAD_F(0x04000000) /* 0.250000000 */,
MAD_F(0x035d13f3) /* 0.210224104 */,
MAD_F(0x02d413cd) /* 0.176776695 */,
MAD_F(0x0260dfc1) /* 0.148650889 */,
MAD_F(0x02000000) /* 0.125000000 */,
MAD_F(0x01ae89fa) /* 0.105112052 */,
MAD_F(0x016a09e6) /* 0.088388348 */,
MAD_F(0x01306fe1) /* 0.074325445 */
}, {
MAD_F(0x0b504f33) /* 0.707106781 */,
MAD_F(0x08000000) /* 0.500000000 */,
MAD_F(0x05a8279a) /* 0.353553391 */,
MAD_F(0x04000000) /* 0.250000000 */,
MAD_F(0x02d413cd) /* 0.176776695 */,
MAD_F(0x02000000) /* 0.125000000 */,
MAD_F(0x016a09e6) /* 0.088388348 */,
MAD_F(0x01000000) /* 0.062500000 */,
MAD_F(0x00b504f3) /* 0.044194174 */,
MAD_F(0x00800000) /* 0.031250000 */,
MAD_F(0x005a827a) /* 0.022097087 */,
MAD_F(0x00400000) /* 0.015625000 */,
MAD_F(0x002d413d) /* 0.011048543 */,
MAD_F(0x00200000) /* 0.007812500 */,
MAD_F(0x0016a09e) /* 0.005524272 */
}
};
/*
* NAME: III_sideinfo()
* DESCRIPTION: decode frame side information from a bitstream
*/
static
enum mad_error III_sideinfo(struct mad_bitptr *ptr, unsigned int nch,
int lsf, struct sideinfo *si,
unsigned int *data_bitlen,
unsigned int *priv_bitlen)
{
unsigned int ngr, gr, ch, i;
enum mad_error result = MAD_ERROR_NONE;
*data_bitlen = 0;
*priv_bitlen = lsf ? ((nch == 1) ? 1 : 2) : ((nch == 1) ? 5 : 3);
si->main_data_begin = mad_bit_read(ptr, lsf ? 8 : 9);
si->private_bits = mad_bit_read(ptr, *priv_bitlen);
ngr = 1;
if (!lsf) {
ngr = 2;
for (ch = 0; ch < nch; ++ch)
si->scfsi[ch] = mad_bit_read(ptr, 4);
}
for (gr = 0; gr < ngr; ++gr) {
struct granule *granule = &si->gr[gr];
for (ch = 0; ch < nch; ++ch) {
struct channel *channel = &granule->ch[ch];
channel->part2_3_length = mad_bit_read(ptr, 12);
channel->big_values = mad_bit_read(ptr, 9);
channel->global_gain = mad_bit_read(ptr, 8);
channel->scalefac_compress = mad_bit_read(ptr, lsf ? 9 : 4);
*data_bitlen += channel->part2_3_length;
if (channel->big_values > 288 && result == 0)
result = MAD_ERROR_BADBIGVALUES;
channel->flags = 0;
/* window_switching_flag */
if (mad_bit_read(ptr, 1)) {
channel->block_type = mad_bit_read(ptr, 2);
if (channel->block_type == 0 && result == 0)
result = MAD_ERROR_BADBLOCKTYPE;
if (!lsf && channel->block_type == 2 && si->scfsi[ch] && result == 0)
result = MAD_ERROR_BADSCFSI;
channel->region0_count = 7;
channel->region1_count = 36;
if (mad_bit_read(ptr, 1))
channel->flags |= mixed_block_flag;
else if (channel->block_type == 2)
channel->region0_count = 8;
for (i = 0; i < 2; ++i)
channel->table_select[i] = mad_bit_read(ptr, 5);
# if defined(DEBUG)
channel->table_select[2] = 4; /* not used */
# endif
for (i = 0; i < 3; ++i)
channel->subblock_gain[i] = mad_bit_read(ptr, 3);
}
else {
channel->block_type = 0;
for (i = 0; i < 3; ++i)
channel->table_select[i] = mad_bit_read(ptr, 5);
channel->region0_count = mad_bit_read(ptr, 4);
channel->region1_count = mad_bit_read(ptr, 3);
}
/* [preflag,] scalefac_scale, count1table_select */
channel->flags |= mad_bit_read(ptr, lsf ? 2 : 3);
}
}
return result;
}
/*
* NAME: III_scalefactors_lsf()
* DESCRIPTION: decode channel scalefactors for LSF from a bitstream
*/
static
unsigned int III_scalefactors_lsf(struct mad_bitptr *ptr,
struct channel *channel,
struct channel *gr1ch, int mode_extension)
{
struct mad_bitptr start;
unsigned int scalefac_compress, index, slen[4], part, n, i;
unsigned char const *nsfb;
start = *ptr;
scalefac_compress = channel->scalefac_compress;
index = (channel->block_type == 2) ?
((channel->flags & mixed_block_flag) ? 2 : 1) : 0;
if (!((mode_extension & I_STEREO) && gr1ch)) {
if (scalefac_compress < 400) {
slen[0] = (scalefac_compress >> 4) / 5;
slen[1] = (scalefac_compress >> 4) % 5;
slen[2] = (scalefac_compress % 16) >> 2;
slen[3] = scalefac_compress % 4;
nsfb = nsfb_table[0][index];
}
else if (scalefac_compress < 500) {
scalefac_compress -= 400;
slen[0] = (scalefac_compress >> 2) / 5;
slen[1] = (scalefac_compress >> 2) % 5;
slen[2] = scalefac_compress % 4;
slen[3] = 0;
nsfb = nsfb_table[1][index];
}
else {
scalefac_compress -= 500;
slen[0] = scalefac_compress / 3;
slen[1] = scalefac_compress % 3;
slen[2] = 0;
slen[3] = 0;
channel->flags |= preflag;
nsfb = nsfb_table[2][index];
}
n = 0;
for (part = 0; part < 4; ++part) {
for (i = 0; i < nsfb[part]; ++i)
channel->scalefac[n++] = mad_bit_read(ptr, slen[part]);
}
while (n < 39)
channel->scalefac[n++] = 0;
}
else { /* (mode_extension & I_STEREO) && gr1ch (i.e. ch == 1) */
scalefac_compress >>= 1;
if (scalefac_compress < 180) {
slen[0] = scalefac_compress / 36;
slen[1] = (scalefac_compress % 36) / 6;
slen[2] = (scalefac_compress % 36) % 6;
slen[3] = 0;
nsfb = nsfb_table[3][index];
}
else if (scalefac_compress < 244) {
scalefac_compress -= 180;
slen[0] = (scalefac_compress % 64) >> 4;
slen[1] = (scalefac_compress % 16) >> 2;
slen[2] = scalefac_compress % 4;
slen[3] = 0;
nsfb = nsfb_table[4][index];
}
else {
scalefac_compress -= 244;
slen[0] = scalefac_compress / 3;
slen[1] = scalefac_compress % 3;
slen[2] = 0;
slen[3] = 0;
nsfb = nsfb_table[5][index];
}
n = 0;
for (part = 0; part < 4; ++part) {
unsigned int max, is_pos;
max = (1 << slen[part]) - 1;
for (i = 0; i < nsfb[part]; ++i) {
is_pos = mad_bit_read(ptr, slen[part]);
channel->scalefac[n] = is_pos;
gr1ch->scalefac[n++] = (is_pos == max);
}
}
while (n < 39) {
channel->scalefac[n] = 0;
gr1ch->scalefac[n++] = 0; /* apparently not illegal */
}
}
return mad_bit_length(&start, ptr);
}
/*
* NAME: III_scalefactors()
* DESCRIPTION: decode channel scalefactors of one granule from a bitstream
*/
static
unsigned int III_scalefactors(struct mad_bitptr *ptr, struct channel *channel,
struct channel const *gr0ch, unsigned int scfsi)
{
struct mad_bitptr start;
unsigned int slen1, slen2, sfbi;
start = *ptr;
slen1 = sflen_table[channel->scalefac_compress].slen1;
slen2 = sflen_table[channel->scalefac_compress].slen2;
if (channel->block_type == 2) {
unsigned int nsfb;
sfbi = 0;
nsfb = (channel->flags & mixed_block_flag) ? 8 + 3 * 3 : 6 * 3;
while (nsfb--)
channel->scalefac[sfbi++] = mad_bit_read(ptr, slen1);
nsfb = 6 * 3;
while (nsfb--)
channel->scalefac[sfbi++] = mad_bit_read(ptr, slen2);
nsfb = 1 * 3;
while (nsfb--)
channel->scalefac[sfbi++] = 0;
}
else { /* channel->block_type != 2 */
if (scfsi & 0x8) {
for (sfbi = 0; sfbi < 6; ++sfbi)
channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
}
else {
for (sfbi = 0; sfbi < 6; ++sfbi)
channel->scalefac[sfbi] = mad_bit_read(ptr, slen1);
}
if (scfsi & 0x4) {
for (sfbi = 6; sfbi < 11; ++sfbi)
channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
}
else {
for (sfbi = 6; sfbi < 11; ++sfbi)
channel->scalefac[sfbi] = mad_bit_read(ptr, slen1);
}
if (scfsi & 0x2) {
for (sfbi = 11; sfbi < 16; ++sfbi)
channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
}
else {
for (sfbi = 11; sfbi < 16; ++sfbi)
channel->scalefac[sfbi] = mad_bit_read(ptr, slen2);
}
if (scfsi & 0x1) {
for (sfbi = 16; sfbi < 21; ++sfbi)
channel->scalefac[sfbi] = gr0ch->scalefac[sfbi];
}
else {
for (sfbi = 16; sfbi < 21; ++sfbi)
channel->scalefac[sfbi] = mad_bit_read(ptr, slen2);
}
channel->scalefac[21] = 0;
}
return mad_bit_length(&start, ptr);
}
/*
* The Layer III formula for requantization and scaling is defined by
* section 2.4.3.4.7.1 of ISO/IEC 11172-3, as follows:
*
* long blocks:
* xr[i] = sign(is[i]) * abs(is[i])^(4/3) *
* 2^((1/4) * (global_gain - 210)) *
* 2^-(scalefac_multiplier *
* (scalefac_l[sfb] + preflag * pretab[sfb]))
*
* short blocks:
* xr[i] = sign(is[i]) * abs(is[i])^(4/3) *
* 2^((1/4) * (global_gain - 210 - 8 * subblock_gain[w])) *
* 2^-(scalefac_multiplier * scalefac_s[sfb][w])
*
* where:
* scalefac_multiplier = (scalefac_scale + 1) / 2
*
* The routines III_exponents() and III_requantize() facilitate this
* calculation.
*/
/*
* NAME: III_exponents()
* DESCRIPTION: calculate scalefactor exponents
*/
static
void III_exponents(struct channel const *channel,
unsigned char const *sfbwidth, signed int exponents[39])
{
signed int gain;
unsigned int scalefac_multiplier, sfbi;
gain = (signed int) channel->global_gain - 210;
scalefac_multiplier = (channel->flags & scalefac_scale) ? 2 : 1;
if (channel->block_type == 2) {
unsigned int l;
signed int gain0, gain1, gain2;
sfbi = l = 0;
if (channel->flags & mixed_block_flag) {
unsigned int premask;
premask = (channel->flags & preflag) ? ~0 : 0;
/* long block subbands 0-1 */
while (l < 36) {
exponents[sfbi] = gain -
(signed int) ((channel->scalefac[sfbi] + (pretab[sfbi] & premask)) <<
scalefac_multiplier);
l += sfbwidth[sfbi++];
}
}
/* this is probably wrong for 8000 Hz short/mixed blocks */
gain0 = gain - 8 * (signed int) channel->subblock_gain[0];
gain1 = gain - 8 * (signed int) channel->subblock_gain[1];
gain2 = gain - 8 * (signed int) channel->subblock_gain[2];
while (l < 576) {
exponents[sfbi + 0] = gain0 -
(signed int) (channel->scalefac[sfbi + 0] << scalefac_multiplier);
exponents[sfbi + 1] = gain1 -
(signed int) (channel->scalefac[sfbi + 1] << scalefac_multiplier);
exponents[sfbi + 2] = gain2 -
(signed int) (channel->scalefac[sfbi + 2] << scalefac_multiplier);
unsigned int w = sfbwidth[sfbi];
l += 3 * w;
sfbi += 3;
}
}
else { /* channel->block_type != 2 */
if (channel->flags & preflag) {
for (sfbi = 0; sfbi < 22; ++sfbi) {
exponents[sfbi] = gain -
(signed int) ((channel->scalefac[sfbi] + pretab[sfbi]) <<
scalefac_multiplier);
}
}
else {
for (sfbi = 0; sfbi < 22; ++sfbi) {
exponents[sfbi] = gain -
(signed int) (channel->scalefac[sfbi] << scalefac_multiplier);
}
}
}
}
/*
* NAME: III_requantize()
* DESCRIPTION: requantize one (positive) value
*/
static
mad_fixed_t III_requantize(unsigned int value, signed int exp)
{
mad_fixed_t requantized;
signed int frac;
unsigned long power;
frac = exp % 4; /* assumes sign(frac) == sign(exp) */
exp /= 4;
/* format rq_table: bit31-27=exponent bit26-0=mantissa */
power = rq_table[value];
requantized = power & 0x07ffffff;
exp += power >> 27;
if (exp < 0) {
if (-exp >= (signed int) (sizeof(mad_fixed_t) * CHAR_BIT)) {
/* underflow */
requantized = 0;
}
else {
requantized += 1L << (-exp - 1);
requantized >>= -exp;
}
}
else {
if (exp >= 5) {
/* overflow */
# if defined(DEBUG)
fprintf(stderr, "requantize overflow (%f * 2^%d)\n",
mad_f_todouble(requantized), exp);
# endif
requantized = MAD_F_MAX;
}
else
requantized <<= exp;
}
return frac ? mad_f_mul(requantized, root_table[3 + frac]) : requantized;
}
/* we must take care that sz >= bits and sz < sizeof(long) lest bits == 0 */
# if defined(CPU_ARM)
# define MASK(cache, sz, bits) \
({ unsigned long res; \
asm ("mov %0, #1\n\t" \
"rsb %0, %0, %0, lsl %3\n\t" \
"and %0, %0, %1, lsr %2" \
: "=&r" (res) : "r" (cache), "r" ((sz) - (bits)), "r" (bits)); \
res; \
})
#else
# define MASK(cache, sz, bits) \
(((cache) >> ((sz) - (bits))) & ((1 << (bits)) - 1))
#endif
# define MASK1BIT(cache, sz) \
((cache) & (1 << ((sz) - 1)))
/*
* NAME: III_huffdecode()
* DESCRIPTION: decode Huffman code words of one channel of one granule
*/
static
enum mad_error III_huffdecode(struct mad_bitptr *ptr, mad_fixed_t xrarr[576],
struct channel *channel,
unsigned char const *sfbwidth,
unsigned int part2_length)
{
unsigned int bits;
signed int exponents[39], exp;
signed int const *expptr;
struct mad_bitptr peek;
signed int bits_left, cachesz;
register mad_fixed_t *xr;
mad_fixed_t const *sfbound;
register unsigned long bitcache;
bits_left = (signed) channel->part2_3_length - (signed) part2_length;
if (bits_left < 0)
return MAD_ERROR_BADPART3LEN;
III_exponents(channel, sfbwidth, exponents);
peek = *ptr;
cachesz = 0;
sfbound = xr = xrarr;
mad_bit_skip(ptr, bits_left);
/* big_values */
{
int region;
struct hufftable const *entry;
union huffpair const *table;
unsigned int linbits, startbits, rcount;
mad_fixed_t reqcache[16];
mad_fixed_t const *xr_end, *xr_big_val;
rcount = 1;
expptr = &exponents[0];
region = -1;
exp = 0x3210; /* start value */
bitcache = 0;
linbits = startbits = 0;
table = NULL;
xr_big_val = xr + 2 * channel->big_values;
while(xr < xr_big_val)
{
sfbound += *sfbwidth++;
xr_end = sfbound > xr_big_val ? xr_big_val : sfbound;
/* change table if region boundary */
if(--rcount == 0)
{
if(exp == 0x3210)
rcount = channel->region0_count + 1;
else
if(region == 0)
rcount = channel->region1_count + 1;
else
rcount = 0; /* all remaining */
entry = &mad_huff_pair_table[channel->table_select[++region]];
table = entry->table;
linbits = entry->linbits;
startbits = entry->startbits;
if(table == 0)
return MAD_ERROR_BADHUFFTABLE;
}
if(exp != *expptr)
{
exp = *expptr;
/* clear cache */
memset(reqcache, 0, sizeof(reqcache));
}
++expptr;
if(linbits)
{
for( ; xr<xr_end; xr+=2)
{
union huffpair const *pair;
register mad_fixed_t requantized;
unsigned int clumpsz, value;
/* maxhuffcode(hufftab16,hufftab24)=17bit + sign(x,y)=2bit */
if(cachesz < 19)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
}
/* hcod (0..19) */
clumpsz = startbits;
pair = &table[MASK(bitcache, cachesz, clumpsz)];
while(!pair->final)
{
cachesz -= clumpsz;
clumpsz = pair->ptr.bits;
pair = &table[pair->ptr.offset + MASK(bitcache, cachesz, clumpsz)];
}
cachesz -= pair->value.hlen;
/* x (0..14) */
value = pair->value.x;
if(value == 0)
xr[0] = 0;
else
{
if(value == 15)
{
/* maxlinbits=13bit + sign(x,y)=2bit */
if(cachesz < 15)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
}
requantized = III_requantize(15+MASK(bitcache, cachesz, linbits), exp);
cachesz -= linbits;
}
else
{
if(reqcache[value])
requantized = reqcache[value];
else
requantized = reqcache[value] = III_requantize(value, exp);
}
xr[0] = MASK1BIT(bitcache, cachesz--) ? -requantized : requantized;
}
/* y (0..14) */
value = pair->value.y;
if(value == 0)
xr[1] = 0;
else
{
if(value == 15)
{
/* maxlinbits=13bit + sign(y)=1bit */
if(cachesz < 14)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
}
requantized = III_requantize(15+MASK(bitcache, cachesz, linbits), exp);
cachesz -= linbits;
}
else
{
if(reqcache[value])
requantized = reqcache[value];
else
requantized = reqcache[value] = III_requantize(value, exp);
}
xr[1] = MASK1BIT(bitcache, cachesz--) ? -requantized : requantized;
}
}
}
else
{
for( ; xr<xr_end; xr+=2)
{
union huffpair const *pair;
register mad_fixed_t requantized;
unsigned int clumpsz, value;
/* maxlookup=4bit + sign(x,y)=2bit */
if(cachesz < 6)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
}
/* hcod (0..19) */
clumpsz = startbits;
pair = &table[MASK(bitcache, cachesz, clumpsz)];
while(!pair->final)
{
cachesz -= clumpsz;
/* maxlookup=4bit + sign(x,y)=2bit */
if(cachesz < 6)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
}
clumpsz = pair->ptr.bits;
pair = &table[pair->ptr.offset + MASK(bitcache, cachesz, clumpsz)];
}
cachesz -= pair->value.hlen;
/* x (0..1) */
value = pair->value.x;
if(value == 0)
xr[0] = 0;
else
{
if(reqcache[value])
requantized = reqcache[value];
else
requantized = reqcache[value] = III_requantize(value, exp);
xr[0] = MASK1BIT(bitcache, cachesz--) ? -requantized : requantized;
}
/* y (0..1) */
value = pair->value.y;
if(value == 0)
xr[1] = 0;
else
{
if(reqcache[value])
requantized = reqcache[value];
else
requantized = reqcache[value] = III_requantize(value, exp);
xr[1] = MASK1BIT(bitcache, cachesz--) ? -requantized : requantized;
}
}
}
}
}
bits_left = ptr->readbit - peek.readbit;
if(bits_left + cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* big_values overrun */
/* count1 */
{
union huffquad const *table;
register mad_fixed_t requantized;
table = mad_huff_quad_table[channel->flags & count1table_select];
requantized = III_requantize(1, exp);
while(xr <= &xrarr[572] && bits_left + cachesz > 0)
{
union huffquad const *quad;
/* hcod (1..6) */
if(cachesz < 10)
{
if(cachesz < 0)
return MAD_ERROR_BADHUFFDATA; /* cache underrun */
bits = MAXLSHIFT - cachesz;
bitcache = (bitcache << bits) | mad_bit_read(&peek, bits);
cachesz += bits;
bits_left -= bits;
}
quad = &table[MASK(bitcache, cachesz, 4)];
/* quad tables guaranteed to have at most one extra lookup */
if (!quad->final) {
cachesz -= 4;
quad = &table[quad->ptr.offset +
MASK(bitcache, cachesz, quad->ptr.bits)];
}
cachesz -= quad->value.hlen;
if (xr == sfbound) {
sfbound += *sfbwidth++;
if (exp != *expptr) {
exp = *expptr;
requantized = III_requantize(1, exp);
}
++expptr;
}
/* v (0..1) */
xr[0] = quad->value.v ?
(MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
/* w (0..1) */
xr[1] = quad->value.w ?
(MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
xr += 2;
if (xr == sfbound) {
sfbound += *sfbwidth++;
if (exp != *expptr) {
exp = *expptr;
requantized = III_requantize(1, exp);
}
++expptr;
}
/* x (0..1) */
xr[0] = quad->value.x ?
(MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
/* y (0..1) */
xr[1] = quad->value.y ?
(MASK1BIT(bitcache, cachesz--) ? -requantized : requantized) : 0;
xr += 2;
}
if(bits_left + cachesz < 0)
{
/* technically the bitstream is misformatted, but apparently
some encoders are just a bit sloppy with stuffing bits */
xr -= 4;
}
}
/* rzero */
memset(xr, 0, (char*)&xrarr[576] - (char*)xr);
return MAD_ERROR_NONE;
}
# undef MASK
# undef MASK1BIT
/*
* NAME: III_reorder()
* DESCRIPTION: reorder frequency lines of a short block into subband order
*/
static
void III_reorder(mad_fixed_t xr[576], struct channel const *channel,
unsigned char const sfbwidth[39])
{
mad_fixed_t tmp[32][3][6];
unsigned int sb, l, f, w, sbw[3], sw[3];
/* this is probably wrong for 8000 Hz mixed blocks */
sb = 0;
if (channel->flags & mixed_block_flag) {
sb = 2;
l = 0;
while (l < 36)
l += *sfbwidth++;
}
for (w = 0; w < 3; ++w) {
sbw[w] = sb;
sw[w] = 0;
}
f = *sfbwidth++;
w = 0;
for (l = 18 * sb; l < 576; ++l) {
if (f-- == 0) {
f = *sfbwidth++ - 1;
w = (w + 1) % 3;
}
unsigned int sbww = sbw[w];
tmp[sbww][w][sw[w]++] = xr[l];
if (sw[w] == 6) {
sw[w] = 0;
++sbw[w];
}
}
memcpy(&xr[18 * sb], &tmp[sb], (576 - 18 * sb) * sizeof(mad_fixed_t));
}
/*
* NAME: III_stereo()
* DESCRIPTION: perform joint stereo processing on a granule
*/
static
enum mad_error III_stereo(mad_fixed_t xr[2][576],
struct granule const *granule,
struct mad_header *header,
unsigned char const *sfbwidth)
{
short modes[39];
unsigned int sfbi, l, n, i;
if (granule->ch[0].block_type !=
granule->ch[1].block_type ||
(granule->ch[0].flags & mixed_block_flag) !=
(granule->ch[1].flags & mixed_block_flag))
return MAD_ERROR_BADSTEREO;
for (i = 0; i < 39; ++i)
modes[i] = header->mode_extension;
/* intensity stereo */
if (header->mode_extension & I_STEREO) {
struct channel const *right_ch = &granule->ch[1];
mad_fixed_t const *right_xr = xr[1];
unsigned int is_pos;
header->flags |= MAD_FLAG_I_STEREO;
/* first determine which scalefactor bands are to be processed */
if (right_ch->block_type == 2) {
unsigned int lower, start, max, bound[3], w;
lower = start = max = bound[0] = bound[1] = bound[2] = 0;
sfbi = l = 0;
if (right_ch->flags & mixed_block_flag) {
while (l < 36) {
n = sfbwidth[sfbi++];
for (i = 0; i < n; ++i) {
if (right_xr[i]) {
lower = sfbi;
break;
}
}
right_xr += n;
l += n;
}
start = sfbi;
}
w = 0;
while (l < 576) {
n = sfbwidth[sfbi++];
for (i = 0; i < n; ++i) {
if (right_xr[i]) {
max = bound[w] = sfbi;
break;
}
}
right_xr += n;
l += n;
w = (w + 1) % 3;
}
if (max)
lower = start;
/* long blocks */
for (i = 0; i < lower; ++i)
modes[i] = header->mode_extension & ~I_STEREO;
/* short blocks */
w = 0;
for (i = start; i < max; ++i) {
if (i < bound[w])
modes[i] = header->mode_extension & ~I_STEREO;
w = (w + 1) % 3;
}
}
else { /* right_ch->block_type != 2 */
unsigned int bound;
bound = 0;
for (sfbi = l = 0; l < 576; l += n) {
n = sfbwidth[sfbi++];
for (i = 0; i < n; ++i) {
if (right_xr[i]) {
bound = sfbi;
break;
}
}
right_xr += n;
}
for (i = 0; i < bound; ++i)
modes[i] = header->mode_extension & ~I_STEREO;
}
/* now do the actual processing */
if (header->flags & MAD_FLAG_LSF_EXT) {
unsigned char const *illegal_pos = granule[1].ch[1].scalefac;
mad_fixed_t const *lsf_scale;
/* intensity_scale */
lsf_scale = is_lsf_table[right_ch->scalefac_compress & 0x1];
for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
n = sfbwidth[sfbi];
if (!(modes[sfbi] & I_STEREO))
continue;
if (illegal_pos[sfbi]) {
modes[sfbi] &= ~I_STEREO;
continue;
}
is_pos = right_ch->scalefac[sfbi];
for (i = 0; i < n; ++i) {
register mad_fixed_t left;
left = xr[0][l + i];
if (is_pos == 0)
xr[1][l + i] = left;
else {
register mad_fixed_t opposite;
opposite = mad_f_mul(left, lsf_scale[(is_pos - 1) / 2]);
if (is_pos & 1) {
xr[0][l + i] = opposite;
xr[1][l + i] = left;
}
else
xr[1][l + i] = opposite;
}
}
}
}
else { /* !(header->flags & MAD_FLAG_LSF_EXT) */
for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
n = sfbwidth[sfbi];
if (!(modes[sfbi] & I_STEREO))
continue;
is_pos = right_ch->scalefac[sfbi];
if (is_pos >= 7) { /* illegal intensity position */
modes[sfbi] &= ~I_STEREO;
continue;
}
for (i = 0; i < n; ++i) {
register mad_fixed_t left;
left = xr[0][l + i];
xr[0][l + i] = mad_f_mul(left, is_table[ is_pos]);
xr[1][l + i] = mad_f_mul(left, is_table[6 - is_pos]);
}
}
}
}
/* middle/side stereo */
if (header->mode_extension & MS_STEREO) {
register mad_fixed_t invsqrt2;
header->flags |= MAD_FLAG_MS_STEREO;
invsqrt2 = root_table[3 + -2];
for (sfbi = l = 0; l < 576; ++sfbi, l += n) {
n = sfbwidth[sfbi];
if (modes[sfbi] != MS_STEREO)
continue;
for (i = 0; i < n; ++i) {
register mad_fixed_t m, s;
m = xr[0][l + i];
s = xr[1][l + i];
xr[0][l + i] = mad_f_mul(m + s, invsqrt2); /* l = (m + s) / sqrt(2) */
xr[1][l + i] = mad_f_mul(m - s, invsqrt2); /* r = (m - s) / sqrt(2) */
}
}
}
return MAD_ERROR_NONE;
}
#if defined(CPU_ARM)
void III_aliasreduce(mad_fixed_t xr[576], int lines);
#else
/*
* NAME: III_aliasreduce()
* DESCRIPTION: perform frequency line alias reduction
*/
static
void III_aliasreduce(mad_fixed_t xr[576], int lines)
{
mad_fixed_t const *bound;
int i;
bound = &xr[lines];
for (xr += 18; xr < bound; xr += 18) {
for (i = 0; i < 8; ++i) {
register mad_fixed_t a, b;
register mad_fixed64hi_t hi;
register mad_fixed64lo_t lo;
a = xr[-1 - i];
b = xr[ i];
# if defined(CPU_COLDFIRE)
(void)hi, (void)lo;
asm volatile ("mac.l %[a], %[csi], %%acc0\n\t"
"msac.l %[b], %[cai], %%acc0\n\t"
"mac.l %[b], %[csi], %%acc1\n\t"
"mac.l %[a], %[cai], %%acc1\n\t"
"movclr.l %%acc0, %[a]\n\t"
"asl.l #3, %[a]\n\t"
"movclr.l %%acc1, %[b]\n\t"
"asl.l #3, %[b]\n\t"
: [a] "+d" (a), [b] "+d" (b)
: [csi] "r" (cs[i]), [cai] "r" (ca[i]));
xr[-1 - i] = a;
xr[ i] = b;
# else
MAD_F_ML0(hi, lo, a, cs[i]);
MAD_F_MLA(hi, lo, -b, ca[i]);
xr[-1 - i] = MAD_F_MLZ(hi, lo);
MAD_F_ML0(hi, lo, b, cs[i]);
MAD_F_MLA(hi, lo, a, ca[i]);
xr[ i] = MAD_F_MLZ(hi, lo);
# endif
}
}
}
#endif
# if defined(FPM_ARM)
void III_imdct_l(mad_fixed_t const [18], mad_fixed_t [36], unsigned int);
# else
/*
* NAME: imdct36
* DESCRIPTION: perform X[18]->x[36] IMDCT
*/
# if defined(CPU_COLDFIRE)
/* emac optimized imdct36, it is very ugly and i hope to replace it soon.
* for now it is actually somewhat faster than the stock implementation.
*/
static inline
void imdct36(mad_fixed_t const X[18], mad_fixed_t x[36])
{
mad_fixed_t t[16];
/* assumes FRACBITS = 28 */
asm volatile (
/* MAD_F_ML0(hi, lo, X[4], MAD_F(0x0ec835e8)); */
/* MAD_F_MLA(hi, lo, X[13], MAD_F(0x061f78aa)); */
/* t6 = MAD_F_MLZ(hi, lo); */
"move.l (4*4, %[X]), %%d0\n"
"move.l #0x0ec835e8, %%d1\n"
"move.l #0x061f78aa, %%d2\n"
"mac.l %%d1, %%d0, (13*4, %[X]), %%d0, %%acc0\n"
"mac.l %%d2, %%d0, ( 1*4, %[X]), %%d0, %%acc0\n"
"move.l %%acc0, %%d7\n"
"asl.l #3, %%d7\n"
"move.l %%d7, (6*4, %[t])\n"
/* MAD_F_ML0(hi, lo, (t14 = X[1] - X[10]), -MAD_F(0x0ec835e8)); */
/* MAD_F_MLA(hi, lo, (t15 = X[7] + X[16]), MAD_F(0x061f78aa)); */
/* t4 = MAD_F_MLZ(hi, lo); */
/* MAD_F_MLA(hi, lo, t14, -MAD_F(0x061f78aa)); */
/* MAD_F_MLA(hi, lo, t15, -MAD_F(0x0ec835e8)); */
/* t0 = MAD_F_MLZ(hi, lo); */
"sub.l (10*4, %[X]), %%d0\n" /* t14 */
"msac.l %%d0, %%d1, %%acc1\n"
"msac.l %%d0, %%d2, (7*4, %[X]), %%d5, %%acc0\n"
"add.l (16*4, %[X]), %%d5\n" /* t15 */
"mac.l %%d5, %%d2, %%acc1\n"
"msac.l %%d5, %%d1, ( %[X]), %%d5, %%acc0\n"
"movclr.l %%acc1, %%d6\n"
"asl.l #3, %%d6\n" /* t4 */
"move.l %%d6, (4*4, %[t])\n"
"move.l %%acc0, %%d0\n"
"asl.l #3, %%d0\n" /* t0 */
"move.l %%d0, (0*4, %[t])\n"
/* MAD_F_MLA(hi, lo, (t8 =X[0]-X[11]-X[12]), MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, (t9 =X[2]-X[ 9]-X[14]), MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, (t10=X[3]-X[ 8]-X[15]), -MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, (t11=X[5]-X[ 6]-X[17]), -MAD_F(0x0fdcf549)); */
/* x[10] = -(x[7] = MAD_F_MLZ(hi, lo)); */
/* MAD_F_ML0(hi, lo, t8, -MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, t9, MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, t10, MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, t11, -MAD_F(0x09bd7ca0)); */
/* x[19] = x[34] = MAD_F_MLZ(hi, lo) - t0; */
/* MAD_F_ML0(hi, lo, t8, MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, t9, -MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, t10, MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, t11, -MAD_F(0x0cb19346)); */
/* x[ 1] = MAD_F_MLZ(hi, lo); */
/* MAD_F_ML0(hi, lo, t8, -MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, t9, -MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, t10, -MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, t11, -MAD_F(0x0216a2a2)); */
/* x[25] = MAD_F_MLZ(hi, lo); */
/* t12 = t8 - t10; */
/* t13 = t9 + t11; */
"move.l #0x0216a2a2, %%d1\n"
"move.l #0x0cb19346, %%d2\n"
"move.l #0x09bd7ca0, %%d3\n"
"move.l #0x0fdcf549, %%d4\n"
"sub.l (11*4, %[X]), %%d5\n"
"sub.l (12*4, %[X]), %%d5\n"
"mac.l %%d1, %%d5, %%acc0\n"
"msac.l %%d2, %%d5, %%acc1\n"
"mac.l %%d3, %%d5, %%acc2\n"
"msac.l %%d4, %%d5, (2*4, %[X]), %%d6, %%acc3\n"
"sub.l ( 9*4, %[X]), %%d6\n"
"sub.l (14*4, %[X]), %%d6\n"
"mac.l %%d3, %%d6, %%acc0\n"
"mac.l %%d4, %%d6, %%acc1\n"
"msac.l %%d1, %%d6, %%acc2\n"
"msac.l %%d2, %%d6, (3*4, %[X]), %%d7, %%acc3\n"
"sub.l ( 8*4, %[X]), %%d7\n"
"sub.l (15*4, %[X]), %%d7\n"
"sub.l %%d7, %%d5\n" /* d5: t12 */
"move.l %%d5, (12*4, %[t])\n"
"msac.l %%d2, %%d7, %%acc0\n"
"mac.l %%d1, %%d7, %%acc1\n"
"mac.l %%d4, %%d7, %%acc2\n"
"msac.l %%d3, %%d7, (5*4, %[X]), %%d7, %%acc3\n"
"sub.l ( 6*4, %[X]), %%d7\n"
"sub.l (17*4, %[X]), %%d7\n"
"add.l %%d7, %%d6\n" /* d6: t13 */
"move.l %%d6, (13*4, %[t])\n"
"msac.l %%d4, %%d7, %%acc0\n"
"msac.l %%d3, %%d7, %%acc1\n"
"msac.l %%d2, %%d7, %%acc2\n"
"msac.l %%d1, %%d7, (1*4, %[X]), %%d5, %%acc3\n"
"movclr.l %%acc0, %%d7\n"
"asl.l #3, %%d7\n"
"move.l %%d7, (7*4, %[x])\n"
"neg.l %%d7\n"
"move.l %%d7, (10*4, %[x])\n"
"movclr.l %%acc1, %%d7\n"
"asl.l #3, %%d7\n"
"sub.l %%d0, %%d7\n"
"move.l %%d7, (19*4, %[x])\n"
"move.l %%d7, (34*4, %[x])\n"
"movclr.l %%acc2, %%d7\n"
"asl.l #3, %%d7\n"
"move.l %%d7, ( 1*4, %[x])\n"
"movclr.l %%acc3, %%d7\n"
"asl.l #3, %%d7\n"
"move.l %%d7, (25*4, %[x])\n"
/* MAD_F_ML0(hi, lo, X[1], -MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, X[7], MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, X[10], -MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, X[16], MAD_F(0x0cb19346)); */
/* t1 = MAD_F_MLZ(hi, lo) + t6; */
/* MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, X[7], -MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, X[10], MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, X[16], MAD_F(0x0fdcf549)); */
/* t3 = MAD_F_MLZ(hi, lo); */
/* MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, X[7], -MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, X[10], -MAD_F(0x09bd7ca0)); */
/* MAD_F_MLA(hi, lo, X[16], -MAD_F(0x0216a2a2)); */
/* t5 = MAD_F_MLZ(hi, lo) - t6; */
"msac.l %%d3, %%d5, %%acc0\n"
"msac.l %%d1, %%d5, %%acc1\n"
"msac.l %%d4, %%d5, ( 7*4, %[X]), %%d5, %%acc2\n"
"mac.l %%d1, %%d5, %%acc0\n"
"msac.l %%d3, %%d5, %%acc1\n"
"msac.l %%d2, %%d5, (10*4, %[X]), %%d5, %%acc2\n"
"msac.l %%d4, %%d5, %%acc0\n"
"mac.l %%d2, %%d5, %%acc1\n"
"msac.l %%d3, %%d5, (16*4, %[X]), %%d5, %%acc2\n"
"mac.l %%d2, %%d5, %%acc0\n"
"mac.l %%d4, %%d5, %%acc1\n"
"msac.l %%d1, %%d5, ( 0*4, %[X]), %%d0, %%acc2\n"
"movclr.l %%acc0, %%d7\n"
"asl.l #3, %%d7\n"
"add.l (6*4, %[t]), %%d7\n" /* t1 */
"movclr.l %%acc1, %%d5\n"
"asl.l #3, %%d5\n" /* t3 */
"movclr.l %%acc2, %%d6\n"
"asl.l #3, %%d6\n"
"sub.l (6*4, %[t]), %%d6\n" /* t5 */
"move.l %%d6, (5*4, %[t])\n"
/* MAD_F_ML0(hi, lo, X[0], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0f9ee890)); */
/* x[11] = -(x[6] = MAD_F_MLZ(hi, lo) + t1); */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[2], -MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[17], MAD_F(0x04cfb0e2)); */
/* x[23] = x[30] = MAD_F_MLZ(hi, lo) + t1; */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[11], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0acf37ad)); */
/* x[18] = x[35] = MAD_F_MLZ(hi, lo) - t1; */
"move.l #0x03768962, %%d1\n"
"move.l #0x0f426cb5, %%d2\n"
"move.l #0x0bcbe352, %%d3\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (11*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"mac.l %%d1, %%d0, (12*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, ( 2*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0e313245, %%d1\n"
"move.l #0x00b2aa3e, %%d2\n"
"move.l #0x0d7e8807, %%d3\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d3, %%d0, ( 9*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, (14*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"mac.l %%d1, %%d0, ( 3*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0ffc19fd, %%d1\n"
"move.l #0x0898c779, %%d2\n"
"move.l #0x07635284, %%d3\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, ( 8*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, (15*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, ( 5*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0acf37ad, %%d1\n"
"move.l #0x0f9ee890, %%d2\n"
"move.l #0x04cfb0e2, %%d3\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d3, %%d0, ( 6*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, (17*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 4*4, %[X]), %%d0, %%acc2\n"
"movclr.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d7, %%d6\n"
"move.l %%d6, (6*4, %[x])\n"
"neg.l %%d6\n"
"move.l %%d6, (11*4, %[x])\n"
"movclr.l %%acc1, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d7, %%d6\n"
"move.l %%d6, (23*4, %[x])\n"
"move.l %%d6, (30*4, %[x])\n"
"movclr.l %%acc2, %%d6\n"
"asl.l #3, %%d6\n"
"sub.l %%d7, %%d6\n"
"move.l %%d6, (18*4, %[x])\n"
"move.l %%d6, (35*4, %[x])\n"
/* MAD_F_ML0(hi, lo, X[4], MAD_F(0x061f78aa)); */
/* MAD_F_MLA(hi, lo, X[13], -MAD_F(0x0ec835e8)); */
/* t3 += (t7 = MAD_F_MLZ(hi, lo)); */
/* t4 -= t7; */
"move.l #0x061f78aa, %%d1\n"
"mac.l %%d1, %%d0, (13*4, %[X]), %%d0, %%acc0\n"
"move.l #0x0ec835e8, %%d1\n"
"msac.l %%d1, %%d0, (1*4, %[X]), %%d0, %%acc0\n"
"move.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n" /* t7 */
"add.l %%d6, %%d5\n" /* t3 */
"move.l (4*4, %[t]), %%d1\n"
"sub.l %%d6, %%d1\n" /* t4 */
"move.l %%d1, (4*4, %[t])\n"
/* MAD_F_MLA(hi, lo, X[1], -MAD_F(0x0cb19346)); */
/* MAD_F_MLA(hi, lo, X[7], MAD_F(0x0fdcf549)); */
/* MAD_F_MLA(hi, lo, X[10], MAD_F(0x0216a2a2)); */
/* MAD_F_MLA(hi, lo, X[16], -MAD_F(0x09bd7ca0)); */
/* t2 = MAD_F_MLZ(hi, lo); */
"move.l #0x0cb19346, %%d1\n"
"msac.l %%d1, %%d0, ( 7*4, %[X]), %%d0, %%acc0\n"
"move.l #0x0fdcf549, %%d1\n"
"mac.l %%d1, %%d0, (10*4, %[X]), %%d0, %%acc0\n"
"move.l #0x0216a2a2, %%d1\n"
"mac.l %%d1, %%d0, (16*4, %[X]), %%d0, %%acc0\n"
"move.l #0x09bd7ca0, %%d1\n"
"msac.l %%d1, %%d0, ( %[X]), %%d0, %%acc0\n"
"move.l %%acc0, %%d7\n"
"asl.l #3, %%d7\n" /* t2 */
/* MAD_F_MLA(hi, lo, X[0], MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[12], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[17], MAD_F(0x0f426cb5)); */
/* x[12] = -(x[5] = MAD_F_MLZ(hi, lo)); */
/* MAD_F_ML0(hi, lo, X[0], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0bcbe352)); */
/* x[17] = -(x[0] = MAD_F_MLZ(hi, lo) + t2); */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[2], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x03768962)); */
/* x[24] = x[29] = MAD_F_MLZ(hi, lo) + t2; */
"move.l #0x0acf37ad, %%d1\n"
"move.l #0x0f9ee890, %%d2\n"
"move.l #0x04cfb0e2, %%d3\n"
"mac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, (11*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (12*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 2*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0ffc19fd, %%d1\n"
"move.l #0x0898c779, %%d2\n"
"move.l #0x07635284, %%d3\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, ( 9*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, (14*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 3*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0e313245, %%d1\n"
"move.l #0x00b2aa3e, %%d2\n"
"move.l #0x0d7e8807, %%d3\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, ( 8*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d3, %%d0, (15*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 5*4, %[X]), %%d0, %%acc2\n"
"move.l #0x03768962, %%d1\n"
"move.l #0x0f426cb5, %%d2\n"
"move.l #0x0bcbe352, %%d3\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d3, %%d0, ( 6*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, (17*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( %[X]), %%d0, %%acc2\n"
"movclr.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n"
"move.l %%d6, ( 5*4, %[x])\n"
"neg.l %%d6\n"
"move.l %%d6, (12*4, %[x])\n"
"movclr.l %%acc1, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d7, %%d6\n"
"move.l %%d6, ( %[x])\n"
"neg.l %%d6\n"
"move.l %%d6, (17*4, %[x])\n"
"movclr.l %%acc2, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d7, %%d6\n"
"move.l %%d6, (24*4, %[x])\n"
"move.l %%d6, (29*4, %[x])\n"
/* MAD_F_ML0(hi, lo, X[0], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[12], MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0ffc19fd)); */
/* x[9] = -(x[8] = MAD_F_MLZ(hi, lo) + t3); */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[14], -MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[17], MAD_F(0x07635284)); */
/* x[21] = x[32] = MAD_F_MLZ(hi, lo) + t3; */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[12], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0898c779)); */
/* x[20] = x[33] = MAD_F_MLZ(hi, lo) - t3; */
"move.l #0x0e313245, %%d1\n"
"move.l #0x00b2aa3e, %%d2\n"
"move.l #0x0d7e8807, %%d3\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (11*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, (12*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, ( 2*4, %[X]), %%d0, %%acc2\n"
"move.l #0x03768962, %%d1\n"
"move.l #0x0f426cb5, %%d2\n"
"move.l #0x0bcbe352, %%d3\n"
"mac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, ( 9*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d1, %%d0, (14*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"mac.l %%d3, %%d0, ( 3*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0acf37ad, %%d1\n"
"move.l #0x0f9ee890, %%d2\n"
"move.l #0x04cfb0e2, %%d3\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"mac.l %%d1, %%d0, ( 8*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"mac.l %%d2, %%d0, (15*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, ( 5*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0ffc19fd, %%d1\n"
"move.l #0x0898c779, %%d2\n"
"move.l #0x07635284, %%d3\n"
"msac.l %%d3, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 6*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (17*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, (12*4, %[t]), %%d0, %%acc2\n"
"movclr.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d5, %%d6\n"
"move.l %%d6, (8*4, %[x])\n"
"neg.l %%d6\n"
"move.l %%d6, (9*4, %[x])\n"
"movclr.l %%acc1, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d5, %%d6\n"
"move.l %%d6, (21*4, %[x])\n"
"move.l %%d6, (32*4, %[x])\n"
"movclr.l %%acc2, %%d6\n"
"asl.l #3, %%d6\n"
"sub.l %%d5, %%d6\n"
"move.l %%d6, (20*4, %[x])\n"
"move.l %%d6, (33*4, %[x])\n"
/* MAD_F_ML0(hi, lo, t12, -MAD_F(0x0ec835e8)); */
/* MAD_F_MLA(hi, lo, t13, MAD_F(0x061f78aa)); */
/* x[22] = x[31] = MAD_F_MLZ(hi, lo) + t0; */
"move.l #0x0ec835e8, %%d1\n"
"move.l #0x061f78aa, %%d2\n"
"msac.l %%d1, %%d0, (13*4, %[t]), %%d3, %%acc0\n"
"mac.l %%d2, %%d3, ( 1*4, %[x]), %%d4, %%acc0\n"
"movclr.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n"
"add.l (0*4, %[t]), %%d6\n"
"move.l %%d6, (22*4, %[x])\n"
"move.l %%d6, (31*4, %[x])\n"
/* MAD_F_ML0(hi, lo, t12, MAD_F(0x061f78aa)); */
/* MAD_F_MLA(hi, lo, t13, MAD_F(0x0ec835e8)); */
/* x[13] = -(x[4] = MAD_F_MLZ(hi, lo) + t4); */
/* x[16] = -(x[1] = x[1] + t4); */
/* x[25] = x[28] = x[25] + t4; */
"mac.l %%d2, %%d0, (4*4, %[t]), %%d2, %%acc0\n"
"mac.l %%d1, %%d3, ( %[X]), %%d0, %%acc0\n"
"movclr.l %%acc0, %%d6\n"
"asl.l #3, %%d6\n"
"add.l %%d2, %%d6\n"
"move.l %%d6, ( 4*4, %[x])\n"
"neg.l %%d6\n"
"move.l %%d6, (13*4, %[x])\n"
"add.l %%d2, %%d4\n"
"move.l %%d4, ( 1*4, %[x])\n"
"neg.l %%d4\n"
"move.l %%d4, (16*4, %[x])\n"
"move.l (25*4, %[x]), %%d4\n"
"add.l %%d2, %%d4\n"
"move.l %%d4, (25*4, %[x])\n"
"move.l %%d4, (28*4, %[x])\n"
/* MAD_F_ML0(hi, lo, X[0], MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[6], MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[12], MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[15], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0d7e8807)); */
/* x[15] = -(x[2] = MAD_F_MLZ(hi, lo) + t5); */
/* MAD_F_ML0(hi, lo, X[0], MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[2], MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[3], MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[5], MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x00b2aa3e)); */
/* MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[11], MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[17], MAD_F(0x0e313245)); */
/* x[14] = -(x[3] = MAD_F_MLZ(hi, lo) + t5); */
/* MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0ffc19fd)); */
/* MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0f9ee890)); */
/* MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0f426cb5)); */
/* MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0e313245)); */
/* MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0d7e8807)); */
/* MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0bcbe352)); */
/* MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0acf37ad)); */
/* MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0898c779)); */
/* MAD_F_MLA(hi, lo, X[12], -MAD_F(0x07635284)); */
/* MAD_F_MLA(hi, lo, X[14], -MAD_F(0x04cfb0e2)); */
/* MAD_F_MLA(hi, lo, X[15], -MAD_F(0x03768962)); */
/* MAD_F_MLA(hi, lo, X[17], -MAD_F(0x00b2aa3e)); */
/* x[26] = x[27] = MAD_F_MLZ(hi, lo) + t5; */
"move.l #0x0ffc19fd, %%d1\n"
"move.l #0x0898c779, %%d2\n"
"move.l #0x07635284, %%d3\n"
"mac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, (11*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, (12*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, ( 2*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0acf37ad, %%d1\n"
"move.l #0x0f9ee890, %%d2\n"
"move.l #0x04cfb0e2, %%d3\n"
"mac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, ( 9*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, (14*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, ( 3*4, %[X]), %%d0, %%acc2\n"
"move.l #0x03768962, %%d1\n"
"move.l #0x0f426cb5, %%d2\n"
"move.l #0x0bcbe352, %%d3\n"
"mac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, ( 8*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d1, %%d0, %%acc0\n"
"mac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (15*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d2, %%d0, %%acc0\n"
"msac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 5*4, %[X]), %%d0, %%acc2\n"
"move.l #0x0e313245, %%d1\n"
"move.l #0x00b2aa3e, %%d2\n"
"move.l #0x0d7e8807, %%d3\n"
"mac.l %%d2, %%d0, %%acc0\n"
"mac.l %%d3, %%d0, %%acc1\n"
"msac.l %%d1, %%d0, ( 6*4, %[X]), %%d0, %%acc2\n"
"mac.l %%d1, %%d0, %%acc0\n"
"msac.l %%d2, %%d0, %%acc1\n"
"msac.l %%d3, %%d0, (17*4, %[X]), %%d0, %%acc2\n"
"msac.l %%d3, %%d0, %%acc0\n"
"mac.l %%d1, %%d0, %%acc1\n"
"msac.l %%d2, %%d0, ( 5*4, %[t]), %%d6, %%acc2\n"
"movclr.l %%acc0, %%d7\n"
"asl.l #3, %%d7\n"
"add.l %%d6, %%d7\n"
"move.l %%d7, (2*4, %[x])\n"
"neg.l %%d7\n"
"move.l %%d7, (15*4, %[x])\n"
"movclr.l %%acc1, %%d7\n"
"asl.l #3, %%d7\n"
"add.l %%d6, %%d7\n"
"move.l %%d7, (3*4, %[x])\n"
"neg.l %%d7\n"
"move.l %%d7, (14*4, %[x])\n"
"movclr.l %%acc2, %%d7\n"
"asl.l #3, %%d7\n"
"add.l %%d6, %%d7\n"
"move.l %%d7, (26*4, %[x])\n"
"move.l %%d7, (27*4, %[x])\n"
: : [X] "a" (X), [x] "a" (x), [t] "a" (t)
: "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7");
/* pfew */
}
# else /* if defined(CPU_COLDFIRE) */
static inline
void imdct36(mad_fixed_t const X[18], mad_fixed_t x[36])
{
mad_fixed_t t0, t1, t2, t3, t4, t5, t6, t7;
mad_fixed_t t8, t9, t10, t11, t12, t13, t14, t15;
register mad_fixed64hi_t hi;
register mad_fixed64lo_t lo;
MAD_F_ML0(hi, lo, (t14 = X[1] - X[10]), -MAD_F(0x0ec835e8));
MAD_F_MLA(hi, lo, (t15 = X[7] + X[16]), MAD_F(0x061f78aa));
t4 = MAD_F_MLZ(hi, lo);
MAD_F_ML0(hi, lo, X[4], MAD_F(0x0ec835e8));
MAD_F_MLA(hi, lo, X[13], MAD_F(0x061f78aa));
t6 = MAD_F_MLZ(hi, lo);
MAD_F_MLA(hi, lo, t14, -MAD_F(0x061f78aa));
MAD_F_MLA(hi, lo, t15, -MAD_F(0x0ec835e8));
t0 = MAD_F_MLZ(hi, lo);
MAD_F_MLA(hi, lo, (t8 =X[0]-X[11]-X[12]), MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, (t9 =X[2]-X[ 9]-X[14]), MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, (t10=X[3]-X[ 8]-X[15]), -MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, (t11=X[5]-X[ 6]-X[17]), -MAD_F(0x0fdcf549));
x[10] = -(x[7] = MAD_F_MLZ(hi, lo));
MAD_F_ML0(hi, lo, t8, -MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, t9, MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, t10, MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, t11, -MAD_F(0x09bd7ca0));
x[19] = x[34] = MAD_F_MLZ(hi, lo) - t0;
MAD_F_ML0(hi, lo, t8, MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, t9, -MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, t10, MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, t11, -MAD_F(0x0cb19346));
x[ 1] = MAD_F_MLZ(hi, lo);
MAD_F_ML0(hi, lo, t8, -MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, t9, -MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, t10, -MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, t11, -MAD_F(0x0216a2a2));
x[25] = MAD_F_MLZ(hi, lo);
t12 = t8 - t10;
t13 = t9 + t11;
MAD_F_ML0(hi, lo, X[1], -MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, X[7], MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, X[10], -MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, X[16], MAD_F(0x0cb19346));
t1 = MAD_F_MLZ(hi, lo) + t6;
MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, X[7], -MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, X[10], MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, X[16], MAD_F(0x0fdcf549));
t3 = MAD_F_MLZ(hi, lo);
MAD_F_ML0(hi, lo, X[1], -MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, X[7], -MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, X[10], -MAD_F(0x09bd7ca0));
MAD_F_MLA(hi, lo, X[16], -MAD_F(0x0216a2a2));
t5 = MAD_F_MLZ(hi, lo) - t6;
MAD_F_ML0(hi, lo, X[0], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0f9ee890));
x[11] = -(x[6] = MAD_F_MLZ(hi, lo) + t1);
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[2], -MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[17], MAD_F(0x04cfb0e2));
x[23] = x[30] = MAD_F_MLZ(hi, lo) + t1;
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[11], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0acf37ad));
x[18] = x[35] = MAD_F_MLZ(hi, lo) - t1;
MAD_F_ML0(hi, lo, X[4], MAD_F(0x061f78aa));
MAD_F_MLA(hi, lo, X[13], -MAD_F(0x0ec835e8));
t3+= (t7 = MAD_F_MLZ(hi, lo));
t4-= t7;
MAD_F_MLA(hi, lo, X[1], -MAD_F(0x0cb19346));
MAD_F_MLA(hi, lo, X[7], MAD_F(0x0fdcf549));
MAD_F_MLA(hi, lo, X[10], MAD_F(0x0216a2a2));
MAD_F_MLA(hi, lo, X[16], -MAD_F(0x09bd7ca0));
t2 = MAD_F_MLZ(hi, lo);
MAD_F_MLA(hi, lo, X[0], MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[12], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[17], MAD_F(0x0f426cb5));
x[12] = -(x[5] = MAD_F_MLZ(hi, lo));
MAD_F_ML0(hi, lo, X[0], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[11], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0bcbe352));
x[17] = -(x[0] = MAD_F_MLZ(hi, lo) + t2);
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[2], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x03768962));
x[24] = x[29] = MAD_F_MLZ(hi, lo) + t2;
MAD_F_ML0(hi, lo, X[0], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[12], MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0ffc19fd));
x[9] = -(x[8] = MAD_F_MLZ(hi, lo) + t3);
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[14], -MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[17], MAD_F(0x07635284));
x[21] = x[32] = MAD_F_MLZ(hi, lo) + t3;
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[12], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0898c779));
x[20] = x[33] = MAD_F_MLZ(hi, lo) - t3;
MAD_F_ML0(hi, lo, t12, -MAD_F(0x0ec835e8));
MAD_F_MLA(hi, lo, t13, MAD_F(0x061f78aa));
x[22] = x[31] = MAD_F_MLZ(hi, lo) + t0;
MAD_F_ML0(hi, lo, t12, MAD_F(0x061f78aa));
MAD_F_MLA(hi, lo, t13, MAD_F(0x0ec835e8));
x[13] = -(x[4] = MAD_F_MLZ(hi, lo) + t4);
x[16] = -(x[1] = x[1] + t4);
x[25] = x[28] = x[25] + t4;
MAD_F_ML0(hi, lo, X[0], MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[6], MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[9], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[12], MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[14], -MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[15], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x0d7e8807));
x[15] = -(x[2] = MAD_F_MLZ(hi, lo) + t5);
MAD_F_ML0(hi, lo, X[0], MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[2], MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[3], MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[5], MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x00b2aa3e));
MAD_F_MLA(hi, lo, X[8], MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[11], MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[14], MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[17], MAD_F(0x0e313245));
x[14] = -(x[3] = MAD_F_MLZ(hi, lo) + t5);
MAD_F_ML0(hi, lo, X[0], -MAD_F(0x0ffc19fd));
MAD_F_MLA(hi, lo, X[2], -MAD_F(0x0f9ee890));
MAD_F_MLA(hi, lo, X[3], -MAD_F(0x0f426cb5));
MAD_F_MLA(hi, lo, X[5], -MAD_F(0x0e313245));
MAD_F_MLA(hi, lo, X[6], -MAD_F(0x0d7e8807));
MAD_F_MLA(hi, lo, X[8], -MAD_F(0x0bcbe352));
MAD_F_MLA(hi, lo, X[9], -MAD_F(0x0acf37ad));
MAD_F_MLA(hi, lo, X[11], -MAD_F(0x0898c779));
MAD_F_MLA(hi, lo, X[12], -MAD_F(0x07635284));
MAD_F_MLA(hi, lo, X[14], -MAD_F(0x04cfb0e2));
MAD_F_MLA(hi, lo, X[15], -MAD_F(0x03768962));
MAD_F_MLA(hi, lo, X[17], -MAD_F(0x00b2aa3e));
x[26] = x[27] = MAD_F_MLZ(hi, lo) + t5;
}
# endif /* CPU_COLDFIRE */
/*
* NAME: III_imdct_l()
* DESCRIPTION: perform IMDCT and windowing for long blocks
*/
static
void III_imdct_l(mad_fixed_t const X[18], mad_fixed_t z[36],
unsigned int block_type)
{
unsigned int i;
/* IMDCT */
imdct36(X, z);
/* windowing */
switch (block_type) {
case 0: /* normal window */
# if 1
/* loop unrolled implementation */
for (i = 0; i < 36; i += 4) {
z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
z[i + 3] = mad_f_mul(z[i + 3], window_l[i + 3]);
}
# else
/* reference implementation */
for (i = 0; i < 36; ++i) z[i] = mad_f_mul(z[i], window_l[i]);
# endif
break;
case 1: /* start block */
for (i = 0; i < 18; i += 3) {
z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
}
/* (i = 18; i < 24; ++i) z[i] unchanged */
for (i = 24; i < 30; ++i) z[i] = mad_f_mul(z[i], window_s[i - 18]);
for (i = 30; i < 36; ++i) z[i] = 0;
break;
case 3: /* stop block */
for (i = 0; i < 6; ++i) z[i] = 0;
for (i = 6; i < 12; ++i) z[i] = mad_f_mul(z[i], window_s[i - 6]);
/* (i = 12; i < 18; ++i) z[i] unchanged */
for (i = 18; i < 36; i += 3) {
z[i + 0] = mad_f_mul(z[i + 0], window_l[i + 0]);
z[i + 1] = mad_f_mul(z[i + 1], window_l[i + 1]);
z[i + 2] = mad_f_mul(z[i + 2], window_l[i + 2]);
}
break;
}
}
# endif /* FPM_ARM */
/*
* NAME: III_imdct_s()
* DESCRIPTION: perform IMDCT and windowing for short blocks
*/
# if defined(CPU_COLDFIRE)
void III_imdct_s(mad_fixed_t const X[18], mad_fixed_t z[36]);
#else
static
void III_imdct_s(mad_fixed_t const X[18], mad_fixed_t z[36])
{
mad_fixed_t y[36], *yptr;
mad_fixed_t const *wptr;
int w, i;
register mad_fixed64hi_t hi;
register mad_fixed64lo_t lo;
/* IMDCT */
yptr = &y[0];
for (w = 0; w < 3; ++w) {
register mad_fixed_t const (*s)[6];
s = imdct_s;
for (i = 0; i < 3; ++i) {
MAD_F_ML0(hi, lo, X[0], (*s)[0]);
MAD_F_MLA(hi, lo, X[1], (*s)[1]);
MAD_F_MLA(hi, lo, X[2], (*s)[2]);
MAD_F_MLA(hi, lo, X[3], (*s)[3]);
MAD_F_MLA(hi, lo, X[4], (*s)[4]);
MAD_F_MLA(hi, lo, X[5], (*s)[5]);
yptr[i + 0] = MAD_F_MLZ(hi, lo);
yptr[5 - i] = -yptr[i + 0];
++s;
MAD_F_ML0(hi, lo, X[0], (*s)[0]);
MAD_F_MLA(hi, lo, X[1], (*s)[1]);
MAD_F_MLA(hi, lo, X[2], (*s)[2]);
MAD_F_MLA(hi, lo, X[3], (*s)[3]);
MAD_F_MLA(hi, lo, X[4], (*s)[4]);
MAD_F_MLA(hi, lo, X[5], (*s)[5]);
yptr[ i + 6] = MAD_F_MLZ(hi, lo);
yptr[11 - i] = yptr[i + 6];
++s;
}
yptr += 12;
X += 6;
}
/* windowing, overlapping and concatenation */
yptr = &y[0];
wptr = &window_s[0];
for (i = 0; i < 6; ++i) {
z[i + 0] = 0;
z[i + 6] = mad_f_mul(yptr[ 0 + 0], wptr[0]);
MAD_F_ML0(hi, lo, yptr[ 0 + 6], wptr[6]);
MAD_F_MLA(hi, lo, yptr[12 + 0], wptr[0]);
z[i + 12] = MAD_F_MLZ(hi, lo);
MAD_F_ML0(hi, lo, yptr[12 + 6], wptr[6]);
MAD_F_MLA(hi, lo, yptr[24 + 0], wptr[0]);
z[i + 18] = MAD_F_MLZ(hi, lo);
z[i + 24] = mad_f_mul(yptr[24 + 6], wptr[6]);
z[i + 30] = 0;
++yptr;
++wptr;
}
}
#endif
#ifdef CPU_ARM
void III_overlap(mad_fixed_t const output[36], mad_fixed_t overlap[18],
mad_fixed_t sample[18][32], unsigned int sb);
#else
/*
* NAME: III_overlap()
* DESCRIPTION: perform overlap-add of windowed IMDCT outputs
*/
static
void III_overlap(mad_fixed_t const output[36], mad_fixed_t overlap[18],
mad_fixed_t sample[18][32], unsigned int sb)
{
unsigned int i;
for (i = 0; i < 18; ++i) {
sample[i][sb] = output[i + 0] + overlap[i];
overlap[i] = output[i + 18];
}
}
#endif
/*
* NAME: III_overlap_z()
* DESCRIPTION: perform "overlap-add" of zero IMDCT outputs
*/
static inline
void III_overlap_z(mad_fixed_t overlap[18],
mad_fixed_t sample[18][32], unsigned int sb)
{
unsigned int i;
for (i = 0; i < 18; ++i) {
sample[i][sb] = overlap[i];
overlap[i] = 0;
}
}
/*
* NAME: III_freqinver()
* DESCRIPTION: perform subband frequency inversion for odd sample lines
*/
static
void III_freqinver(mad_fixed_t sample[18][32], unsigned int sb)
{
unsigned int i;
for (i = 1; i < 18; i += 2)
sample[i][sb] = -sample[i][sb];
}
/*
* NAME: III_decode()
* DESCRIPTION: decode frame main_data
*/
static
enum mad_error III_decode(struct mad_bitptr *ptr, struct mad_frame *frame,
struct sideinfo *si, unsigned int nch)
{
struct mad_header *header = &frame->header;
unsigned int sfreqi, ngr, gr;
{
unsigned int sfreq;
sfreq = header->samplerate;
if (header->flags & MAD_FLAG_MPEG_2_5_EXT)
sfreq *= 2;
/* 48000 => 0, 44100 => 1, 32000 => 2,
24000 => 3, 22050 => 4, 16000 => 5 */
sfreqi = ((sfreq >> 7) & 0x000f) +
((sfreq >> 15) & 0x0001) - 8;
if (header->flags & MAD_FLAG_MPEG_2_5_EXT)
sfreqi += 3;
}
/* scalefactors, Huffman decoding, requantization */
ngr = (header->flags & MAD_FLAG_LSF_EXT) ? 1 : 2;
for (gr = 0; gr < ngr; ++gr) {
struct granule *granule = &si->gr[gr];
unsigned char const *sfbwidth[2];
mad_fixed_t xr[2][576];
unsigned int ch;
enum mad_error error;
for (ch = 0; ch < nch; ++ch) {
struct channel *channel = &granule->ch[ch];
unsigned int part2_length;
sfbwidth[ch] = sfbwidth_table[sfreqi].l;
if (channel->block_type == 2) {
sfbwidth[ch] = (channel->flags & mixed_block_flag) ?
sfbwidth_table[sfreqi].m : sfbwidth_table[sfreqi].s;
}
if (header->flags & MAD_FLAG_LSF_EXT) {
part2_length = III_scalefactors_lsf(ptr, channel,
ch == 0 ? 0 : &si->gr[1].ch[1],
header->mode_extension);
}
else {
part2_length = III_scalefactors(ptr, channel, &si->gr[0].ch[ch],
gr == 0 ? 0 : si->scfsi[ch]);
}
error = III_huffdecode(ptr, xr[ch], channel, sfbwidth[ch], part2_length);
if (error)
return error;
}
/* joint stereo processing */
if (header->mode == MAD_MODE_JOINT_STEREO && header->mode_extension) {
error = III_stereo(xr, granule, header, sfbwidth[0]);
if (error)
return error;
}
/* reordering, alias reduction, IMDCT, overlap-add, frequency inversion */
for (ch = 0; ch < nch; ++ch) {
struct channel const *channel = &granule->ch[ch];
mad_fixed_t (*sample)[32] = &((*frame->sbsample)[ch][18 * gr]);
unsigned int sb, l, i, sblimit;
mad_fixed_t output[36];
if (channel->block_type == 2) {
III_reorder(xr[ch], channel, sfbwidth[ch]);
# if !defined(OPT_STRICT)
/*
* According to ISO/IEC 11172-3, "Alias reduction is not applied for
* granules with block_type == 2 (short block)." However, other
* sources suggest alias reduction should indeed be performed on the
* lower two subbands of mixed blocks. Most other implementations do
* this, so by default we will too.
*/
if (channel->flags & mixed_block_flag)
III_aliasreduce(xr[ch], 36);
# endif
}
else
III_aliasreduce(xr[ch], 576);
l = 0;
/* subbands 0-1 */
if (channel->block_type != 2 || (channel->flags & mixed_block_flag)) {
unsigned int block_type;
block_type = channel->block_type;
if (channel->flags & mixed_block_flag)
block_type = 0;
/* long blocks */
for (sb = 0; sb < 2; ++sb, l += 18) {
III_imdct_l(&xr[ch][l], output, block_type);
III_overlap(output, (*frame->overlap)[ch][sb], sample, sb);
}
}
else {
/* short blocks */
for (sb = 0; sb < 2; ++sb, l += 18) {
III_imdct_s(&xr[ch][l], output);
III_overlap(output, (*frame->overlap)[ch][sb], sample, sb);
}
}
III_freqinver(sample, 1);
/* (nonzero) subbands 2-31 */
/*
i = 576;
while (i > 36 && xr[ch][i - 1] == 0)
--i;
*/
{
/* saves ~600k cycles */
mad_fixed_t *p = &xr[ch][576];
mad_fixed_t tmp = xr[ch][35];
xr[ch][35] = 1;
while (!*--p);
xr[ch][35] = tmp;
i = p - &xr[ch][0] + 1;
}
sblimit = 32 - (576 - i) / 18;
if (channel->block_type != 2) {
/* long blocks */
for (sb = 2; sb < sblimit; ++sb, l += 18) {
III_imdct_l(&xr[ch][l], output, channel->block_type);
III_overlap(output, (*frame->overlap)[ch][sb], sample, sb);
if (sb & 1)
III_freqinver(sample, sb);
}
}
else {
/* short blocks */
for (sb = 2; sb < sblimit; ++sb, l += 18) {
III_imdct_s(&xr[ch][l], output);
III_overlap(output, (*frame->overlap)[ch][sb], sample, sb);
if (sb & 1)
III_freqinver(sample, sb);
}
}
/* remaining (zero) subbands */
for (sb = sblimit; sb < 32; ++sb) {
III_overlap_z((*frame->overlap)[ch][sb], sample, sb);
if (sb & 1)
III_freqinver(sample, sb);
}
}
}
return MAD_ERROR_NONE;
}
/*
* NAME: layer->III()
* DESCRIPTION: decode a single Layer III frame
*/
int mad_layer_III(struct mad_stream *stream, struct mad_frame *frame)
{
struct mad_header *header = &frame->header;
unsigned int nch, priv_bitlen, next_md_begin = 0;
unsigned int si_len, data_bitlen, md_len;
unsigned int frame_space, frame_used, frame_free;
struct mad_bitptr ptr;
struct sideinfo si;
enum mad_error error;
int result = 0;
#if 0 /* rockbox: do not allocate */
/* allocate Layer III dynamic structures */
/* rockbox: not used. Both pointers are linked to an array in rockbox'
* apps/codecs/mpa.c before calling this. */
if (stream->main_data == 0) {
stream->main_data = malloc(MAD_BUFFER_MDLEN);
if (stream->main_data == 0) {
stream->error = MAD_ERROR_NOMEM;
return -1;
}
}
if (frame->overlap == 0) {
frame->overlap = calloc(2 * 32 * 18, sizeof(mad_fixed_t));
if (frame->overlap == 0) {
stream->error = MAD_ERROR_NOMEM;
return -1;
}
}
#else
/* rockbox: This should not happen. Return with error. */
if ((stream->main_data == 0) || (frame->overlap == 0)) {
stream->error = MAD_ERROR_NOMEM;
return -1;
}
#endif /* rockbox */
nch = MAD_NCHANNELS(header);
si_len = (header->flags & MAD_FLAG_LSF_EXT) ?
(nch == 1 ? 9 : 17) : (nch == 1 ? 17 : 32);
/* check frame sanity */
if (stream->next_frame - mad_bit_nextbyte(&stream->ptr) <
(signed int) si_len) {
stream->error = MAD_ERROR_BADFRAMELEN;
stream->md_len = 0;
return -1;
}
/* check CRC word */
if (header->flags & MAD_FLAG_PROTECTION) {
header->crc_check =
mad_bit_crc(stream->ptr, si_len * CHAR_BIT, header->crc_check);
if (header->crc_check != header->crc_target &&
!(frame->options & MAD_OPTION_IGNORECRC)) {
stream->error = MAD_ERROR_BADCRC;
result = -1;
}
}
/* decode frame side information */
error = III_sideinfo(&stream->ptr, nch, header->flags & MAD_FLAG_LSF_EXT,
&si, &data_bitlen, &priv_bitlen);
if (error && result == 0) {
stream->error = error;
result = -1;
}
header->flags |= priv_bitlen;
header->private_bits |= si.private_bits;
/* find main_data of next frame */
{
struct mad_bitptr peek;
unsigned long header;
mad_bit_init(&peek, stream->next_frame);
header = mad_bit_read(&peek, 32);
if ((header & 0xffe60000L) /* syncword | layer */ == 0xffe20000L) {
if (!(header & 0x00010000L)) /* protection_bit */
mad_bit_skip(&peek, 16); /* crc_check */
next_md_begin =
mad_bit_read(&peek, (header & 0x00080000L) /* ID */ ? 9 : 8);
}
mad_bit_finish(&peek);
}
/* find main_data of this frame */
frame_space = stream->next_frame - mad_bit_nextbyte(&stream->ptr);
if (next_md_begin > si.main_data_begin + frame_space)
next_md_begin = 0;
md_len = si.main_data_begin + frame_space - next_md_begin;
frame_used = 0;
if (si.main_data_begin == 0) {
ptr = stream->ptr;
stream->md_len = 0;
frame_used = md_len;
}
else {
if (si.main_data_begin > stream->md_len) {
if (result == 0) {
stream->error = MAD_ERROR_BADDATAPTR;
result = -1;
}
}
else {
mad_bit_init(&ptr,
*stream->main_data + stream->md_len - si.main_data_begin);
if (md_len > si.main_data_begin) {
assert(stream->md_len + md_len -
si.main_data_begin <= MAD_BUFFER_MDLEN);
memcpy(*stream->main_data + stream->md_len,
mad_bit_nextbyte(&stream->ptr),
frame_used = md_len - si.main_data_begin);
stream->md_len += frame_used;
}
}
}
frame_free = frame_space - frame_used;
/* decode main_data */
if (result == 0) {
error = III_decode(&ptr, frame, &si, nch);
if (error) {
stream->error = error;
result = -1;
}
/* designate ancillary bits */
stream->anc_ptr = ptr;
stream->anc_bitlen = md_len * CHAR_BIT - data_bitlen;
}
# if 0 && defined(DEBUG)
fprintf(stderr,
"main_data_begin:%u, md_len:%u, frame_free:%u, "
"data_bitlen:%u, anc_bitlen: %u\n",
si.main_data_begin, md_len, frame_free,
data_bitlen, stream->anc_bitlen);
# endif
/* preload main_data buffer with up to 511 bytes for next frame(s) */
if (frame_free >= next_md_begin) {
memcpy(*stream->main_data,
stream->next_frame - next_md_begin, next_md_begin);
stream->md_len = next_md_begin;
}
else {
if (md_len < si.main_data_begin) {
unsigned int extra;
extra = si.main_data_begin - md_len;
if (extra + frame_free > next_md_begin)
extra = next_md_begin - frame_free;
if (extra < stream->md_len) {
memmove(*stream->main_data,
*stream->main_data + stream->md_len - extra, extra);
stream->md_len = extra;
}
}
else
stream->md_len = 0;
memcpy(*stream->main_data + stream->md_len,
stream->next_frame - frame_free, frame_free);
stream->md_len += frame_free;
}
return result;
}
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