157 lines
9.6 KiB
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Executable File
157 lines
9.6 KiB
HTML
Executable File
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<title>libmusepack: include/musepack/math.h Source File</title>
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<a class="el" href="dir_000000.html">include</a> / <a class="el" href="dir_000001.html">musepack</a></div>
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<h1>math.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/*</span>
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00002 <span class="comment"> Copyright (c) 2005, The Musepack Development Team</span>
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00003 <span class="comment"> All rights reserved.</span>
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00004 <span class="comment"></span>
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00005 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
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00006 <span class="comment"> modification, are permitted provided that the following conditions are</span>
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00007 <span class="comment"> met:</span>
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00008 <span class="comment"></span>
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00009 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
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00010 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
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00011 <span class="comment"></span>
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00012 <span class="comment"> * Redistributions in binary form must reproduce the above</span>
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00013 <span class="comment"> copyright notice, this list of conditions and the following</span>
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00014 <span class="comment"> disclaimer in the documentation and/or other materials provided</span>
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00015 <span class="comment"> with the distribution.</span>
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00016 <span class="comment"></span>
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00017 <span class="comment"> * Neither the name of the The Musepack Development Team nor the</span>
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00018 <span class="comment"> names of its contributors may be used to endorse or promote</span>
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00019 <span class="comment"> products derived from this software without specific prior</span>
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00020 <span class="comment"> written permission.</span>
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00021 <span class="comment"></span>
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00022 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
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00023 <span class="comment"> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
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00024 <span class="comment"> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
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00025 <span class="comment"> A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
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00026 <span class="comment"> OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
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00027 <span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
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00028 <span class="comment"> LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
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00029 <span class="comment"> DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
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00030 <span class="comment"> THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
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00031 <span class="comment"> (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
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00032 <span class="comment"> OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
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00033 <span class="comment">*/</span>
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00034
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00037
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00038 <span class="preprocessor">#ifndef _musepack_math_h_</span>
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00039 <span class="preprocessor"></span><span class="preprocessor">#define _musepack_math_h_</span>
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00040 <span class="preprocessor"></span>
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00041 <span class="comment">//#define MPC_FIXED_POINT</span>
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00042
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00043 <span class="preprocessor">#define MPC_FIXED_POINT_SHIFT 16</span>
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00044 <span class="preprocessor"></span>
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00045 <span class="preprocessor">#ifdef MPC_FIXED_POINT</span>
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00046 <span class="preprocessor"></span>
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00047
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00048 <span class="preprocessor">#ifdef _WIN32_WCE</span>
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00049 <span class="preprocessor"></span>
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00050 <span class="preprocessor">#include <cmnintrin.h></span>
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00051
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00052 <span class="preprocessor">#define MPC_HAVE_MULHIGH</span>
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00053 <span class="preprocessor"></span>
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00054 <span class="preprocessor">#endif</span>
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00055 <span class="preprocessor"></span>
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00056
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00057 <span class="preprocessor">#define MPC_FIXED_POINT_SCALE_SHIFT (MPC_FIXED_POINT_SHIFT + MPC_FIXED_POINT_FRACTPART)</span>
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00058 <span class="preprocessor"></span><span class="preprocessor">#define MPC_FIXED_POINT_SCALE (1 << (MPC_FIXED_POINT_SCALE_SHIFT - 1))</span>
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00059 <span class="preprocessor"></span>
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00060
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00061 <span class="comment">//in fixedpoint mode, results in decode output buffer are in -MPC_FIXED_POINT_SCALE ... MPC_FIXED_POINT_SCALE range</span>
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00062
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00063 <span class="preprocessor">#define MPC_FIXED_POINT_FRACTPART 14</span>
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00064 <span class="preprocessor"></span><span class="keyword">typedef</span> mpc_int32_t MPC_SAMPLE_FORMAT;
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00065
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00066 <span class="keyword">typedef</span> mpc_int64_t MPC_SAMPLE_FORMAT_MULTIPLY;
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00067
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00068 <span class="preprocessor">#define MAKE_MPC_SAMPLE(X) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<MPC_FIXED_POINT_FRACTPART))</span>
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00069 <span class="preprocessor"></span><span class="preprocessor">#define MAKE_MPC_SAMPLE_EX(X,Y) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<(Y)))</span>
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00070 <span class="preprocessor"></span>
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00071 <span class="preprocessor">#define MPC_MULTIPLY_NOTRUNCATE(X,Y) \</span>
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00072 <span class="preprocessor"> (((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> MPC_FIXED_POINT_FRACTPART)</span>
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00073 <span class="preprocessor"></span>
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00074 <span class="preprocessor">#define MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z) \</span>
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00075 <span class="preprocessor"> (((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> (Z))</span>
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00076 <span class="preprocessor"></span>
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00077 <span class="preprocessor">#ifdef _DEBUG</span>
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00078 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keyword">inline</span> MPC_SAMPLE_FORMAT MPC_MULTIPLY(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2)
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00079 {
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00080 MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_NOTRUNCATE(item1,item2);
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00081 assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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00082 <span class="keywordflow">return</span> (MPC_SAMPLE_FORMAT)temp;
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00083 }
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00084
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00085 static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY_EX(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2,<span class="keywordtype">unsigned</span> shift)
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00086 {
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00087 MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_EX_NOTRUNCATE(item1,item2,shift);
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00088 assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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00089 <span class="keywordflow">return</span> (MPC_SAMPLE_FORMAT)temp;
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00090 }
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00091
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00092 #else
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00093
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00094 #define MPC_MULTIPLY(X,Y) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_NOTRUNCATE(X,Y))
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00095 #define MPC_MULTIPLY_EX(X,Y,Z) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z))
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00096
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00097 #endif
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00098
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00099 #ifdef MPC_HAVE_MULHIGH
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00100 #define MPC_MULTIPLY_FRACT(X,Y) _MulHigh(X,Y)
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00101 #else
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00102 #define MPC_MULTIPLY_FRACT(X,Y) MPC_MULTIPLY_EX(X,Y,32)
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00103 #endif
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00104
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00105 #define MPC_MAKE_FRACT_CONST(X) (MPC_SAMPLE_FORMAT)((X) * (<span class="keywordtype">double</span>)(((mpc_int64_t)1)<<32) )
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00106 #define MPC_MULTIPLY_FRACT_CONST(X,Y) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST(Y))
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00107 #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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00108 #define MPC_MULTIPLY_FRACT_CONST_SHR(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y / (1<<(Z)) ))
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00109
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00110 #define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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00111 #define MPC_SCALE_CONST(X,Y,Z) MPC_MULTIPLY_EX(X,MAKE_MPC_SAMPLE_EX(Y,Z),(Z))
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00112 #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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00113 #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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00114 #define MPC_SHR(X,Y) ((X)>>(Y))
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00115 #define MPC_SHL(X,Y) ((X)<<(Y))
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00116
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00117 #else
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00118
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00119 <span class="comment">//in floating-point mode, decoded samples are in -1...1 range</span>
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00120
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00121 typedef <span class="keywordtype">float</span> MPC_SAMPLE_FORMAT;
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00122
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00123 #define MAKE_MPC_SAMPLE(X) ((MPC_SAMPLE_FORMAT)(X))
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00124 #define MAKE_MPC_SAMPLE_EX(X,Y) ((MPC_SAMPLE_FORMAT)(X))
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00125
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00126 #define MPC_MULTIPLY_FRACT(X,Y) ((X)*(Y))
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00127 #define MPC_MAKE_FRACT_CONST(X) (X)
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00128 #define MPC_MULTIPLY_FRACT_CONST(X,Y) MPC_MULTPLY_FRACT(X,MPC_MAKE_FRACT_CONST(Y))
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00129 #define MPC_MULTIPLY_FRACT_CONST_SHR(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y ))
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00130 #define MPC_MULTIPLY_FRACT_CONST_FIX(X,Y,Z) MPC_MULTIPLY_FRACT(X,MPC_MAKE_FRACT_CONST( Y ))
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00131
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00132 #define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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00133 #define MPC_MULTIPLY(X,Y) ((X)*(Y))
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00134 #define MPC_MULTIPLY_EX(X,Y,Z) ((X)*(Y))
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00135 #define MPC_SCALE_CONST(X,Y,Z) ((X)*(Y))
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00136 #define MPC_SCALE_CONST_SHL(X,Y,Z,S) ((X)*(Y))
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00137 #define MPC_SCALE_CONST_SHR(X,Y,Z,S) ((X)*(Y))
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00138 #define MPC_SHR(X,Y) (X)
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00139 #define MPC_SHL(X,Y) (X)
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00140
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00141 #endif
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00142
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00143 #endif <span class="comment">// _musepack_math_h_</span>
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00144
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sat Jan 22 09:34:06 2005 for libmusepack by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.1 </small></address>
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