ad17fd4747
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6276 a1c6a512-1295-4272-9138-f99709370657
144 lines
5.2 KiB
C
144 lines
5.2 KiB
C
/*
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Copyright (c) 2005, The Musepack Development Team
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of the The Musepack Development Team nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/// \file mpc_math.h
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/// Libmusepack internal math routines.
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#ifndef _musepack_math_h_
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#define _musepack_math_h_
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#define MPC_FIXED_POINT
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#define MPC_FIXED_POINT_SHIFT 16
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#ifdef MPC_FIXED_POINT
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#ifdef _WIN32_WCE
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#include <cmnintrin.h>
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#define MPC_HAVE_MULHIGH
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#endif
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#define MPC_FIXED_POINT_SCALE_SHIFT (MPC_FIXED_POINT_SHIFT + MPC_FIXED_POINT_FRACTPART)
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#define MPC_FIXED_POINT_SCALE (1 << (MPC_FIXED_POINT_SCALE_SHIFT - 1))
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//in fixedpoint mode, results in decode output buffer are in -MPC_FIXED_POINT_SCALE ... MPC_FIXED_POINT_SCALE range
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#define MPC_FIXED_POINT_FRACTPART 14
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typedef mpc_int32_t MPC_SAMPLE_FORMAT;
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typedef mpc_int64_t MPC_SAMPLE_FORMAT_MULTIPLY;
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#define MAKE_MPC_SAMPLE(X) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<MPC_FIXED_POINT_FRACTPART))
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#define MAKE_MPC_SAMPLE_EX(X,Y) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<(Y)))
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#define MPC_MULTIPLY_NOTRUNCATE(X,Y) \
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(((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> MPC_FIXED_POINT_FRACTPART)
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#define MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z) \
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(((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> (Z))
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#ifdef _DEBUG
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static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2)
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{
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MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_NOTRUNCATE(item1,item2);
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assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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return (MPC_SAMPLE_FORMAT)temp;
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}
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static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY_EX(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2,unsigned shift)
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{
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MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_EX_NOTRUNCATE(item1,item2,shift);
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assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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return (MPC_SAMPLE_FORMAT)temp;
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}
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#else
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#define MPC_MULTIPLY(X,Y) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_NOTRUNCATE(X,Y))
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#define MPC_MULTIPLY_EX(X,Y,Z) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z))
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#endif
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#ifdef MPC_HAVE_MULHIGH
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#define MPC_MULTIPLY_FRACT(X,Y) _MulHigh(X,Y)
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#else
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#define MPC_MULTIPLY_FRACT(X,Y) MPC_MULTIPLY_EX(X,Y,32)
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#endif
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#define MPC_MAKE_FRACT_CONST(X) (MPC_SAMPLE_FORMAT)((X) * (double)(((mpc_int64_t)1)<<32) )
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#define MPC_MULTIPLY_FRACT_CONST(X,Y) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST(Y))
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#define MPC_MULTIPLY_FRACT_CONST_FIX(X,Y,Z) ( MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y / (1<<(Z)) )) << (Z) )
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#define MPC_MULTIPLY_FRACT_CONST_SHR(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y / (1<<(Z)) ))
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#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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#define MPC_SCALE_CONST(X,Y,Z) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z))
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#define MPC_SCALE_CONST_SHL(X,Y,Z,S) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z)-(S))
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#define MPC_SCALE_CONST_SHR(X,Y,Z,S) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z)+(S))
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#define MPC_SHR(X,Y) ((X)>>(Y))
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#define MPC_SHL(X,Y) ((X)<<(Y))
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#else
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//in floating-point mode, decoded samples are in -1...1 range
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typedef float MPC_SAMPLE_FORMAT;
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#define MAKE_MPC_SAMPLE(X) ((MPC_SAMPLE_FORMAT)(X))
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#define MAKE_MPC_SAMPLE_EX(X,Y) ((MPC_SAMPLE_FORMAT)(X))
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#define MPC_MULTIPLY_FRACT(X,Y) ((X)*(Y))
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#define MPC_MAKE_FRACT_CONST(X) (X)
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#define MPC_MULTIPLY_FRACT_CONST(X,Y) MPC_MULTPLY_FRACT(X,MPC_MAKE_FRACT_CONST(Y))
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#define MPC_MULTIPLY_FRACT_CONST_SHR(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y ))
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#define MPC_MULTIPLY_FRACT_CONST_FIX(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y ))
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#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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#define MPC_MULTIPLY(X,Y) ((X)*(Y))
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#define MPC_MULTIPLY_EX(X,Y,Z) ((X)*(Y))
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#define MPC_SCALE_CONST(X,Y,Z) ((X)*(Y))
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#define MPC_SCALE_CONST_SHL(X,Y,Z,S) ((X)*(Y))
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#define MPC_SCALE_CONST_SHR(X,Y,Z,S) ((X)*(Y))
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#define MPC_SHR(X,Y) (X)
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#define MPC_SHL(X,Y) (X)
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#endif
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#endif // _musepack_math_h_
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