68 lines
2.9 KiB
C
Executable file
68 lines
2.9 KiB
C
Executable file
#ifndef _QUANT_H_
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#define _QUANT_H_
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#include <inttypes.h>
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/* This table contains unscaled integer casts of the floating point inverse
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* quantization factors used by wma pro. The formula for calculating the
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* floating point value is :
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* quant = pow(10.0, exp/20)
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* 'exp' is an integer value which I have exmerimentally found to fall in the
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* range (0,180). */
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const int32_t quant_tab[181] = {
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0x00000001, 0x00000001,
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0x00000001, 0x00000001, 0x00000002, 0x00000002,
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0x00000002, 0x00000002, 0x00000003, 0x00000003,
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0x00000003, 0x00000004, 0x00000004, 0x00000004,
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0x00000005, 0x00000006, 0x00000006, 0x00000007,
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0x00000008, 0x00000009, 0x0000000a, 0x0000000b,
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0x0000000d, 0x0000000e, 0x00000010, 0x00000012,
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0x00000014, 0x00000016, 0x00000019, 0x0000001c,
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0x00000020, 0x00000023, 0x00000028, 0x0000002d,
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0x00000032, 0x00000038, 0x0000003f, 0x00000047,
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0x0000004f, 0x00000059, 0x00000064, 0x00000070,
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0x0000007e, 0x0000008d, 0x0000009e, 0x000000b2,
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0x000000c8, 0x000000e0, 0x000000fb, 0x0000011a,
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0x0000013C, 0x00000163, 0x0000018E, 0x000001BF,
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0x000001F5, 0x00000232, 0x00000277, 0x000002C4,
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0x0000031A, 0x0000037B, 0x000003E8, 0x00000462,
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0x000004EB, 0x00000585, 0x00000631, 0x000006F2,
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0x000007CB, 0x000008BF, 0x000009D0, 0x00000B02,
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0x00000C5A, 0x00000DDC, 0x00000F8D, 0x00001173,
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0x00001394, 0x000015F7, 0x000018A6, 0x00001BA7,
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0x00001F07, 0x000022D1, 0x00002710, 0x00002BD4,
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0x0000312D, 0x0000372D, 0x00003DE9, 0x00004577,
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0x00004DF1, 0x00005773, 0x0000621F, 0x00006E18,
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0x00007B87, 0x00008A99, 0x00009B83, 0x0000AE7C,
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0x0000C3C7, 0x0000DBAA, 0x0000F678, 0x0001148B,
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0x00013649, 0x00015C25, 0x000186A0, 0x0001B64A,
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0x0001EBC5, 0x000227C6, 0x00026B19, 0x0002B6A4,
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0x00030B66, 0x00036A80, 0x0003D535, 0x00044CEE,
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0x0004D344, 0x000569FD, 0x0006131B, 0x0006D0DC,
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0x0007A5C3, 0x000894A5, 0x0009A0AD, 0x000ACD6A,
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0x000C1ED8, 0x000D9973, 0x000F4240, 0x00111EE2,
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0x001335AD, 0x00158DBA, 0x00182EFD, 0x001B2267,
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0x001E71FE, 0x00222901, 0x0026540E, 0x002B014F,
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0x003040A6, 0x003623E6, 0x003CBF10, 0x00442894,
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0x004C79A0, 0x0055CE75, 0x006046C5, 0x006C0622,
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0x00793472, 0x0087FE7D, 0x00989680, 0x00AB34D9,
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0x00C018C6, 0x00D7893F, 0x00F1D5E4, 0x010F580A,
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0x013073EF, 0x01559A0B, 0x017F4890, 0x01AE0D15,
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0x01E28679, 0x021D66FB, 0x025F769D, 0x02A995C7,
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0x02FCC043, 0x035A1095, 0x03C2C3B6, 0x04383D52,
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0x04BC0C77, 0x054FF0E6, 0x05F5E100, 0x06B01075,
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0x0780F7BD, 0x086B5C7A, 0x09725AE7, 0x0A997065,
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0x0BE48757, 0x0D580472, 0x0EF8D5A3, 0x10CC82D5,
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0x12D940B6, 0x152605CD, 0x17BAA222, 0x1A9FD9C8,
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0x1DDF82A1, 0x2184A5CD, 0x259BA520, 0x2A326538,
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0x2F587CAA, 0x351F68FA, 0x3B9ACA00,
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};
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#define EXP_MIN 0
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#define EXP_MAX 180
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/* return the correct value of quant based on exp */
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#define QUANT(exp) quant_tab[exp - EXP_MIN]
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#endif /* _QUANT_H_ */
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