42774d3128
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24712 a1c6a512-1295-4272-9138-f99709370657
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*
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* WMA compatible decoder
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* Copyright (c) 2002 The FFmpeg Project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef CODECLIB_MDCT_H_INCLUDED
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#define CODECLIB_MDCT_H_INCLUDED
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//#include "types.h"
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#include "fft.h"
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void ff_imdct_calc(unsigned int nbits, fixed32 *output, const fixed32 *input);
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void ff_imdct_half(unsigned int nbits, fixed32 *output, const fixed32 *input);
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#ifdef CPU_ARM
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/*Sign-15.16 format */
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#define fixmul32b(x, y) \
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({ int32_t __hi; \
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uint32_t __lo; \
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int32_t __result; \
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asm ("smull %0, %1, %3, %4\n\t" \
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"mov %2, %1, lsl #1" \
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: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
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: "%r" (x), "r" (y) \
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: "cc" ); \
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__result; \
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})
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#elif defined(CPU_COLDFIRE)
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static inline int32_t fixmul32b(int32_t x, int32_t y)
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{
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asm (
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"mac.l %[x], %[y], %%acc0 \n" /* multiply */
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"movclr.l %%acc0, %[x] \n" /* get higher half */
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: [x] "+d" (x)
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: [y] "d" (y)
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);
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return x;
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}
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#else
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static inline fixed32 fixmul32b(fixed32 x, fixed32 y)
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{
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fixed64 temp;
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temp = x;
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temp *= y;
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temp >>= 31; //16+31-16 = 31 bits
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return (fixed32)temp;
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}
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#endif
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#ifdef CPU_ARM
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static inline
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void CMUL(fixed32 *x, fixed32 *y,
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fixed32 a, fixed32 b,
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fixed32 t, fixed32 v)
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{
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/* This version loses one bit of precision. Could be solved at the cost
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* of 2 extra cycles if it becomes an issue. */
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int x1, y1, l;
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asm(
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"smull %[l], %[y1], %[b], %[t] \n"
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"smlal %[l], %[y1], %[a], %[v] \n"
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"rsb %[b], %[b], #0 \n"
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"smull %[l], %[x1], %[a], %[t] \n"
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"smlal %[l], %[x1], %[b], %[v] \n"
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: [l] "=&r" (l), [x1]"=&r" (x1), [y1]"=&r" (y1), [b] "+r" (b)
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: [a] "r" (a), [t] "r" (t), [v] "r" (v)
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: "cc"
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);
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*x = x1 << 1;
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*y = y1 << 1;
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}
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#elif defined CPU_COLDFIRE
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static inline
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void CMUL(fixed32 *x, fixed32 *y,
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fixed32 a, fixed32 b,
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fixed32 t, fixed32 v)
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{
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asm volatile ("mac.l %[a], %[t], %%acc0;"
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"msac.l %[b], %[v], %%acc0;"
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"mac.l %[b], %[t], %%acc1;"
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"mac.l %[a], %[v], %%acc1;"
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"movclr.l %%acc0, %[a];"
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"move.l %[a], (%[x]);"
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"movclr.l %%acc1, %[a];"
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"move.l %[a], (%[y]);"
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: [a] "+&r" (a)
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: [x] "a" (x), [y] "a" (y),
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[b] "r" (b), [t] "r" (t), [v] "r" (v)
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: "cc", "memory");
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}
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#else
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static inline
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void CMUL(fixed32 *pre,
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fixed32 *pim,
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fixed32 are,
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fixed32 aim,
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fixed32 bre,
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fixed32 bim)
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{
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//int64_t x,y;
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fixed32 _aref = are;
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fixed32 _aimf = aim;
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fixed32 _bref = bre;
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fixed32 _bimf = bim;
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fixed32 _r1 = fixmul32b(_bref, _aref);
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fixed32 _r2 = fixmul32b(_bimf, _aimf);
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fixed32 _r3 = fixmul32b(_bref, _aimf);
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fixed32 _r4 = fixmul32b(_bimf, _aref);
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*pre = _r1 - _r2;
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*pim = _r3 + _r4;
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}
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#endif
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/* Inverse gain of circular cordic rotation in s0.31 format. */
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long fsincos(unsigned long phase, fixed32 *cos);
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#endif // CODECLIB_MDCT_H_INCLUDED
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