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diff --git a/audio_codec/libmad/fixed.h b/audio_codec/libmad/fixed.h new file mode 100644 index 0000000..5556e15 --- a/dev/null +++ b/audio_codec/libmad/fixed.h @@ -0,0 +1,499 @@ +/* + * 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: fixed.h,v 1.38 2004/02/17 02:02:03 rob Exp $ + */ + +# ifndef LIBMAD_FIXED_H +# define LIBMAD_FIXED_H +#include "config.h" +# if SIZEOF_INT >= 4 +typedef signed int mad_fixed_t; + +typedef signed int mad_fixed64hi_t; +typedef unsigned int mad_fixed64lo_t; +# else +typedef signed long mad_fixed_t; + +typedef signed long mad_fixed64hi_t; +typedef unsigned long mad_fixed64lo_t; +# endif + +# if defined(_MSC_VER) +# define mad_fixed64_t signed __int64 +# elif 1 || defined(__GNUC__) +# define mad_fixed64_t signed long long +# endif + +# if defined(FPM_FLOAT) +typedef double mad_sample_t; +# else +typedef mad_fixed_t mad_sample_t; +# endif + +/* + * Fixed-point format: 0xABBBBBBB + * A == whole part (sign + 3 bits) + * B == fractional part (28 bits) + * + * Values are signed two's complement, so the effective range is: + * 0x80000000 to 0x7fffffff + * -8.0 to +7.9999999962747097015380859375 + * + * The smallest representable value is: + * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9) + * + * 28 bits of fractional accuracy represent about + * 8.6 digits of decimal accuracy. + * + * Fixed-point numbers can be added or subtracted as normal + * integers, but multiplication requires shifting the 64-bit result + * from 56 fractional bits back to 28 (and rounding.) + * + * Changing the definition of MAD_F_FRACBITS is only partially + * supported, and must be done with care. + */ + +# define MAD_F_FRACBITS 28 + +# if MAD_F_FRACBITS == 28 +# define MAD_F(x) ((mad_fixed_t) (x##L)) +# else +# if MAD_F_FRACBITS < 28 +# warning "MAD_F_FRACBITS < 28" +# define MAD_F(x) ((mad_fixed_t) \ + (((x##L) + \ + (1L << (28 - MAD_F_FRACBITS - 1))) >> \ + (28 - MAD_F_FRACBITS))) +# elif MAD_F_FRACBITS > 28 +# error "MAD_F_FRACBITS > 28 not currently supported" +# define MAD_F(x) ((mad_fixed_t) \ + ((x##L) << (MAD_F_FRACBITS - 28))) +# endif +# endif + +# define MAD_F_MIN ((mad_fixed_t) -0x80000000L) +# define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL) + +# define MAD_F_ONE MAD_F(0x10000000) + +# define mad_f_tofixed(x) ((mad_fixed_t) \ + ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5)) +# define mad_f_todouble(x) ((double) \ + ((x) / (double) (1L << MAD_F_FRACBITS))) + +# define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS) +# define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1)) +/* (x should be positive) */ + +# define mad_f_fromint(x) ((x) << MAD_F_FRACBITS) + +# define mad_f_add(x, y) ((x) + (y)) +# define mad_f_sub(x, y) ((x) - (y)) + +# if defined(FPM_FLOAT) +# error "FPM_FLOAT not yet supported" + +# undef MAD_F +# define MAD_F(x) mad_f_todouble(x) + +# define mad_f_mul(x, y) ((x) * (y)) +# define mad_f_scale64 + +# undef ASO_ZEROCHECK + +# elif defined(FPM_64BIT) + +/* + * This version should be the most accurate if 64-bit types are supported by + * the compiler, although it may not be the most efficient. + */ +# if defined(OPT_ACCURACY) +# define mad_f_mul(x, y) \ + ((mad_fixed_t) \ + ((((mad_fixed64_t) (x) * (y)) + \ + (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS)) +# else +# define mad_f_mul(x, y) \ + ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS)) +# endif + +# define MAD_F_SCALEBITS MAD_F_FRACBITS + +/* --- Intel --------------------------------------------------------------- */ + +# elif defined(FPM_INTEL) + +# if defined(_MSC_VER) +# pragma warning(push) +# pragma warning(disable: 4035) /* no return value */ +static __forceinline +mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y) +{ + enum { + fracbits = MAD_F_FRACBITS + }; + + __asm { + mov eax, x + imul y + shrd eax, edx, fracbits + } + + /* implicit return of eax */ +} +# pragma warning(pop) + +# define mad_f_mul mad_f_mul_inline +# define mad_f_scale64 +# else +/* + * This Intel version is fast and accurate; the disposition of the least + * significant bit depends on OPT_ACCURACY via mad_f_scale64(). + */ +# define MAD_F_MLX(hi, lo, x, y) \ + asm ("imull %3" \ + : "=a" (lo), "=d" (hi) \ + : "%a" (x), "rm" (y) \ + : "cc") + +# if defined(OPT_ACCURACY) +/* + * This gives best accuracy but is not very fast. + */ +# define MAD_F_MLA(hi, lo, x, y) \ + ({ mad_fixed64hi_t __hi; \ + mad_fixed64lo_t __lo; \ + MAD_F_MLX(__hi, __lo, (x), (y)); \ + asm ("addl %2,%0\n\t" \ + "adcl %3,%1" \ + : "=rm" (lo), "=rm" (hi) \ + : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi) \ + : "cc"); \ + }) +# endif /* OPT_ACCURACY */ + +# if defined(OPT_ACCURACY) +/* + * Surprisingly, this is faster than SHRD followed by ADC. + */ +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed64hi_t __hi_; \ + mad_fixed64lo_t __lo_; \ + mad_fixed_t __result; \ + asm ("addl %4,%2\n\t" \ + "adcl %5,%3" \ + : "=rm" (__lo_), "=rm" (__hi_) \ + : "0" (lo), "1" (hi), \ + "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0) \ + : "cc"); \ + asm ("shrdl %3,%2,%1" \ + : "=rm" (__result) \ + : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS) \ + : "cc"); \ + __result; \ + }) +# elif defined(OPT_INTEL) +/* + * Alternate Intel scaling that may or may not perform better. + */ +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed_t __result; \ + asm ("shrl %3,%1\n\t" \ + "shll %4,%2\n\t" \ + "orl %2,%1" \ + : "=rm" (__result) \ + : "0" (lo), "r" (hi), \ + "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \ + : "cc"); \ + __result; \ + }) +# else +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed_t __result; \ + asm ("shrdl %3,%2,%1" \ + : "=rm" (__result) \ + : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \ + : "cc"); \ + __result; \ + }) +# endif /* OPT_ACCURACY */ + +# define MAD_F_SCALEBITS MAD_F_FRACBITS +# endif + +/* --- ARM ----------------------------------------------------------------- */ + +# elif defined(FPM_ARM) + +/* + * This ARM V4 version is as accurate as FPM_64BIT but much faster. The + * least significant bit is properly rounded at no CPU cycle cost! + */ +# if 1 +/* + * This is faster than the default implementation via MAD_F_MLX() and + * mad_f_scale64(). + */ +# define mad_f_mul(x, y) \ + ({ mad_fixed64hi_t __hi; \ + mad_fixed64lo_t __lo; \ + mad_fixed_t __result; \ + asm ("smull %0, %1, %3, %4\n\t" \ + "movs %0, %0, lsr %5\n\t" \ + "adc %2, %0, %1, lsl %6" \ + : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \ + : "%r" (x), "r" (y), \ + "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \ + : "cc"); \ + __result; \ + }) +# endif + +# define MAD_F_MLX(hi, lo, x, y) \ + asm ("smull %0, %1, %2, %3" \ + : "=&r" (lo), "=&r" (hi) \ + : "%r" (x), "r" (y)) + +# define MAD_F_MLA(hi, lo, x, y) \ + asm ("smlal %0, %1, %2, %3" \ + : "+r" (lo), "+r" (hi) \ + : "%r" (x), "r" (y)) + +# define MAD_F_MLN(hi, lo) \ + asm ("rsbs %0, %2, #0\n\t" \ + "rsc %1, %3, #0" \ + : "=r" (lo), "=r" (hi) \ + : "0" (lo), "1" (hi) \ + : "cc") + +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed_t __result; \ + asm ("movs %0, %1, lsr %3\n\t" \ + "adc %0, %0, %2, lsl %4" \ + : "=&r" (__result) \ + : "r" (lo), "r" (hi), \ + "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \ + : "cc"); \ + __result; \ + }) + +# define MAD_F_SCALEBITS MAD_F_FRACBITS + +/* --- MIPS ---------------------------------------------------------------- */ + +# elif defined(FPM_MIPS) + +/* + * This MIPS version is fast and accurate; the disposition of the least + * significant bit depends on OPT_ACCURACY via mad_f_scale64(). + */ +# define MAD_F_MLX(hi, lo, x, y) \ + asm ("mult %2,%3" \ + : "=l" (lo), "=h" (hi) \ + : "%r" (x), "r" (y)) + +# if defined(HAVE_MADD_ASM) +# define MAD_F_MLA(hi, lo, x, y) \ + asm ("madd %2,%3" \ + : "+l" (lo), "+h" (hi) \ + : "%r" (x), "r" (y)) +# elif defined(HAVE_MADD16_ASM) +/* + * This loses significant accuracy due to the 16-bit integer limit in the + * multiply/accumulate instruction. + */ +# define MAD_F_ML0(hi, lo, x, y) \ + asm ("mult %2,%3" \ + : "=l" (lo), "=h" (hi) \ + : "%r" ((x) >> 12), "r" ((y) >> 16)) +# define MAD_F_MLA(hi, lo, x, y) \ + asm ("madd16 %2,%3" \ + : "+l" (lo), "+h" (hi) \ + : "%r" ((x) >> 12), "r" ((y) >> 16)) +# define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo)) +# endif + +# if defined(OPT_SPEED) +# define mad_f_scale64(hi, lo) \ + ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS))) +# define MAD_F_SCALEBITS MAD_F_FRACBITS +# endif + +/* --- SPARC --------------------------------------------------------------- */ + +# elif defined(FPM_SPARC) + +/* + * This SPARC V8 version is fast and accurate; the disposition of the least + * significant bit depends on OPT_ACCURACY via mad_f_scale64(). + */ +# define MAD_F_MLX(hi, lo, x, y) \ + asm ("smul %2, %3, %0\n\t" \ + "rd %%y, %1" \ + : "=r" (lo), "=r" (hi) \ + : "%r" (x), "rI" (y)) + +/* --- PowerPC ------------------------------------------------------------- */ + +# elif defined(FPM_PPC) + +/* + * This PowerPC version is fast and accurate; the disposition of the least + * significant bit depends on OPT_ACCURACY via mad_f_scale64(). + */ +# define MAD_F_MLX(hi, lo, x, y) \ + do { \ + asm ("mullw %0,%1,%2" \ + : "=r" (lo) \ + : "%r" (x), "r" (y)); \ + asm ("mulhw %0,%1,%2" \ + : "=r" (hi) \ + : "%r" (x), "r" (y)); \ + } \ + while (0) + +# if defined(OPT_ACCURACY) +/* + * This gives best accuracy but is not very fast. + */ +# define MAD_F_MLA(hi, lo, x, y) \ + ({ mad_fixed64hi_t __hi; \ + mad_fixed64lo_t __lo; \ + MAD_F_MLX(__hi, __lo, (x), (y)); \ + asm ("addc %0,%2,%3\n\t" \ + "adde %1,%4,%5" \ + : "=r" (lo), "=r" (hi) \ + : "%r" (lo), "r" (__lo), \ + "%r" (hi), "r" (__hi) \ + : "xer"); \ + }) +# endif + +# if defined(OPT_ACCURACY) +/* + * This is slower than the truncating version below it. + */ +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed_t __result, __round; \ + asm ("rotrwi %0,%1,%2" \ + : "=r" (__result) \ + : "r" (lo), "i" (MAD_F_SCALEBITS)); \ + asm ("extrwi %0,%1,1,0" \ + : "=r" (__round) \ + : "r" (__result)); \ + asm ("insrwi %0,%1,%2,0" \ + : "+r" (__result) \ + : "r" (hi), "i" (MAD_F_SCALEBITS)); \ + asm ("add %0,%1,%2" \ + : "=r" (__result) \ + : "%r" (__result), "r" (__round)); \ + __result; \ + }) +# else +# define mad_f_scale64(hi, lo) \ + ({ mad_fixed_t __result; \ + asm ("rotrwi %0,%1,%2" \ + : "=r" (__result) \ + : "r" (lo), "i" (MAD_F_SCALEBITS)); \ + asm ("insrwi %0,%1,%2,0" \ + : "+r" (__result) \ + : "r" (hi), "i" (MAD_F_SCALEBITS)); \ + __result; \ + }) +# endif + +# define MAD_F_SCALEBITS MAD_F_FRACBITS + +/* --- Default ------------------------------------------------------------- */ + +# elif defined(FPM_DEFAULT) + +/* + * This version is the most portable but it loses significant accuracy. + * Furthermore, accuracy is biased against the second argument, so care + * should be taken when ordering operands. + * + * The scale factors are constant as this is not used with SSO. + * + * Pre-rounding is required to stay within the limits of compliance. + */ +# if defined(OPT_SPEED) +# define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16)) +# else +# define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \ + (((y) + (1L << 15)) >> 16)) +# endif + +/* ------------------------------------------------------------------------- */ + +# else +# error "no FPM selected" +# endif + +/* default implementations */ + +# if !defined(mad_f_mul) +# define mad_f_mul(x, y) \ + ({ register mad_fixed64hi_t __hi; \ + register mad_fixed64lo_t __lo; \ + MAD_F_MLX(__hi, __lo, (x), (y)); \ + mad_f_scale64(__hi, __lo); \ + }) +# endif + +# if !defined(MAD_F_MLA) +# define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y))) +# define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y))) +# define MAD_F_MLN(hi, lo) ((lo) = -(lo)) +# define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo)) +# endif + +# if !defined(MAD_F_ML0) +# define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y)) +# endif + +# if !defined(MAD_F_MLN) +# define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi)) +# endif + +# if !defined(MAD_F_MLZ) +# define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo)) +# endif + +# if !defined(mad_f_scale64) +# if defined(OPT_ACCURACY) +# define mad_f_scale64(hi, lo) \ + ((((mad_fixed_t) \ + (((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \ + ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1) +# else +# define mad_f_scale64(hi, lo) \ + ((mad_fixed_t) \ + (((hi) << (32 - MAD_F_SCALEBITS)) | \ + ((lo) >> MAD_F_SCALEBITS))) +# endif +# define MAD_F_SCALEBITS MAD_F_FRACBITS +# endif + +/* C routines */ + +mad_fixed_t mad_f_abs(mad_fixed_t); +mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t); + +# endif |