media/libopus/celt/fixed_generic.h@ac0c01689b40 (annotated)
media/libopus/celt/fixed_generic.h
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* Copyright (C) 2007-2009 Xiph.Org Foundation |
| michael@0 | 2 | Copyright (C) 2003-2008 Jean-Marc Valin |
| michael@0 | 3 | Copyright (C) 2007-2008 CSIRO */ |
| michael@0 | 4 | /** |
| michael@0 | 5 | @file fixed_generic.h |
| michael@0 | 6 | @brief Generic fixed-point operations |
| michael@0 | 7 | */ |
| michael@0 | 8 | /* |
| michael@0 | 9 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 10 | modification, are permitted provided that the following conditions |
| michael@0 | 11 | are met: |
| michael@0 | 12 | |
| michael@0 | 13 | - Redistributions of source code must retain the above copyright |
| michael@0 | 14 | notice, this list of conditions and the following disclaimer. |
| michael@0 | 15 | |
| michael@0 | 16 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 17 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 18 | documentation and/or other materials provided with the distribution. |
| michael@0 | 19 | |
| michael@0 | 20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 21 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 22 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| michael@0 | 23 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
| michael@0 | 24 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| michael@0 | 25 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| michael@0 | 26 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| michael@0 | 27 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| michael@0 | 28 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| michael@0 | 29 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| michael@0 | 30 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 31 | */ |
| michael@0 | 32 | |
| michael@0 | 33 | #ifndef FIXED_GENERIC_H |
| michael@0 | 34 | #define FIXED_GENERIC_H |
| michael@0 | 35 | |
| michael@0 | 36 | /** Multiply a 16-bit signed value by a 16-bit unsigned value. The result is a 32-bit signed value */ |
| michael@0 | 37 | #define MULT16_16SU(a,b) ((opus_val32)(opus_val16)(a)*(opus_val32)(opus_uint16)(b)) |
| michael@0 | 38 | |
| michael@0 | 39 | /** 16x32 multiplication, followed by a 16-bit shift right. Results fits in 32 bits */ |
| michael@0 | 40 | #define MULT16_32_Q16(a,b) ADD32(MULT16_16((a),SHR((b),16)), SHR(MULT16_16SU((a),((b)&0x0000ffff)),16)) |
| michael@0 | 41 | |
| michael@0 | 42 | /** 16x32 multiplication, followed by a 16-bit shift right (round-to-nearest). Results fits in 32 bits */ |
| michael@0 | 43 | #define MULT16_32_P16(a,b) ADD32(MULT16_16((a),SHR((b),16)), PSHR(MULT16_16SU((a),((b)&0x0000ffff)),16)) |
| michael@0 | 44 | |
| michael@0 | 45 | /** 16x32 multiplication, followed by a 15-bit shift right. Results fits in 32 bits */ |
| michael@0 | 46 | #define MULT16_32_Q15(a,b) ADD32(SHL(MULT16_16((a),SHR((b),16)),1), SHR(MULT16_16SU((a),((b)&0x0000ffff)),15)) |
| michael@0 | 47 | |
| michael@0 | 48 | /** 32x32 multiplication, followed by a 31-bit shift right. Results fits in 32 bits */ |
| michael@0 | 49 | #define MULT32_32_Q31(a,b) ADD32(ADD32(SHL(MULT16_16(SHR((a),16),SHR((b),16)),1), SHR(MULT16_16SU(SHR((a),16),((b)&0x0000ffff)),15)), SHR(MULT16_16SU(SHR((b),16),((a)&0x0000ffff)),15)) |
| michael@0 | 50 | |
| michael@0 | 51 | /** Compile-time conversion of float constant to 16-bit value */ |
| michael@0 | 52 | #define QCONST16(x,bits) ((opus_val16)(.5+(x)*(((opus_val32)1)<<(bits)))) |
| michael@0 | 53 | |
| michael@0 | 54 | /** Compile-time conversion of float constant to 32-bit value */ |
| michael@0 | 55 | #define QCONST32(x,bits) ((opus_val32)(.5+(x)*(((opus_val32)1)<<(bits)))) |
| michael@0 | 56 | |
| michael@0 | 57 | /** Negate a 16-bit value */ |
| michael@0 | 58 | #define NEG16(x) (-(x)) |
| michael@0 | 59 | /** Negate a 32-bit value */ |
| michael@0 | 60 | #define NEG32(x) (-(x)) |
| michael@0 | 61 | |
| michael@0 | 62 | /** Change a 32-bit value into a 16-bit value. The value is assumed to fit in 16-bit, otherwise the result is undefined */ |
| michael@0 | 63 | #define EXTRACT16(x) ((opus_val16)(x)) |
| michael@0 | 64 | /** Change a 16-bit value into a 32-bit value */ |
| michael@0 | 65 | #define EXTEND32(x) ((opus_val32)(x)) |
| michael@0 | 66 | |
| michael@0 | 67 | /** Arithmetic shift-right of a 16-bit value */ |
| michael@0 | 68 | #define SHR16(a,shift) ((a) >> (shift)) |
| michael@0 | 69 | /** Arithmetic shift-left of a 16-bit value */ |
| michael@0 | 70 | #define SHL16(a,shift) ((opus_int16)((opus_uint16)(a)<<(shift))) |
| michael@0 | 71 | /** Arithmetic shift-right of a 32-bit value */ |
| michael@0 | 72 | #define SHR32(a,shift) ((a) >> (shift)) |
| michael@0 | 73 | /** Arithmetic shift-left of a 32-bit value */ |
| michael@0 | 74 | #define SHL32(a,shift) ((opus_int32)((opus_uint32)(a)<<(shift))) |
| michael@0 | 75 | |
| michael@0 | 76 | /** 32-bit arithmetic shift right with rounding-to-nearest instead of rounding down */ |
| michael@0 | 77 | #define PSHR32(a,shift) (SHR32((a)+((EXTEND32(1)<<((shift))>>1)),shift)) |
| michael@0 | 78 | /** 32-bit arithmetic shift right where the argument can be negative */ |
| michael@0 | 79 | #define VSHR32(a, shift) (((shift)>0) ? SHR32(a, shift) : SHL32(a, -(shift))) |
| michael@0 | 80 | |
| michael@0 | 81 | /** "RAW" macros, should not be used outside of this header file */ |
| michael@0 | 82 | #define SHR(a,shift) ((a) >> (shift)) |
| michael@0 | 83 | #define SHL(a,shift) SHL32(a,shift) |
| michael@0 | 84 | #define PSHR(a,shift) (SHR((a)+((EXTEND32(1)<<((shift))>>1)),shift)) |
| michael@0 | 85 | #define SATURATE(x,a) (((x)>(a) ? (a) : (x)<-(a) ? -(a) : (x))) |
| michael@0 | 86 | |
| michael@0 | 87 | #define SATURATE16(x) (EXTRACT16((x)>32767 ? 32767 : (x)<-32768 ? -32768 : (x))) |
| michael@0 | 88 | |
| michael@0 | 89 | /** Shift by a and round-to-neareast 32-bit value. Result is a 16-bit value */ |
| michael@0 | 90 | #define ROUND16(x,a) (EXTRACT16(PSHR32((x),(a)))) |
| michael@0 | 91 | /** Divide by two */ |
| michael@0 | 92 | #define HALF16(x) (SHR16(x,1)) |
| michael@0 | 93 | #define HALF32(x) (SHR32(x,1)) |
| michael@0 | 94 | |
| michael@0 | 95 | /** Add two 16-bit values */ |
| michael@0 | 96 | #define ADD16(a,b) ((opus_val16)((opus_val16)(a)+(opus_val16)(b))) |
| michael@0 | 97 | /** Subtract two 16-bit values */ |
| michael@0 | 98 | #define SUB16(a,b) ((opus_val16)(a)-(opus_val16)(b)) |
| michael@0 | 99 | /** Add two 32-bit values */ |
| michael@0 | 100 | #define ADD32(a,b) ((opus_val32)(a)+(opus_val32)(b)) |
| michael@0 | 101 | /** Subtract two 32-bit values */ |
| michael@0 | 102 | #define SUB32(a,b) ((opus_val32)(a)-(opus_val32)(b)) |
| michael@0 | 103 | |
| michael@0 | 104 | /** 16x16 multiplication where the result fits in 16 bits */ |
| michael@0 | 105 | #define MULT16_16_16(a,b) ((((opus_val16)(a))*((opus_val16)(b)))) |
| michael@0 | 106 | |
| michael@0 | 107 | /* (opus_val32)(opus_val16) gives TI compiler a hint that it's 16x16->32 multiply */ |
| michael@0 | 108 | /** 16x16 multiplication where the result fits in 32 bits */ |
| michael@0 | 109 | #define MULT16_16(a,b) (((opus_val32)(opus_val16)(a))*((opus_val32)(opus_val16)(b))) |
| michael@0 | 110 | |
| michael@0 | 111 | /** 16x16 multiply-add where the result fits in 32 bits */ |
| michael@0 | 112 | #define MAC16_16(c,a,b) (ADD32((c),MULT16_16((a),(b)))) |
| michael@0 | 113 | /** 16x32 multiply, followed by a 15-bit shift right and 32-bit add. |
| michael@0 | 114 | b must fit in 31 bits. |
| michael@0 | 115 | Result fits in 32 bits. */ |
| michael@0 | 116 | #define MAC16_32_Q15(c,a,b) ADD32(c,ADD32(MULT16_16((a),SHR((b),15)), SHR(MULT16_16((a),((b)&0x00007fff)),15))) |
| michael@0 | 117 | |
| michael@0 | 118 | #define MULT16_16_Q11_32(a,b) (SHR(MULT16_16((a),(b)),11)) |
| michael@0 | 119 | #define MULT16_16_Q11(a,b) (SHR(MULT16_16((a),(b)),11)) |
| michael@0 | 120 | #define MULT16_16_Q13(a,b) (SHR(MULT16_16((a),(b)),13)) |
| michael@0 | 121 | #define MULT16_16_Q14(a,b) (SHR(MULT16_16((a),(b)),14)) |
| michael@0 | 122 | #define MULT16_16_Q15(a,b) (SHR(MULT16_16((a),(b)),15)) |
| michael@0 | 123 | |
| michael@0 | 124 | #define MULT16_16_P13(a,b) (SHR(ADD32(4096,MULT16_16((a),(b))),13)) |
| michael@0 | 125 | #define MULT16_16_P14(a,b) (SHR(ADD32(8192,MULT16_16((a),(b))),14)) |
| michael@0 | 126 | #define MULT16_16_P15(a,b) (SHR(ADD32(16384,MULT16_16((a),(b))),15)) |
| michael@0 | 127 | |
| michael@0 | 128 | /** Divide a 32-bit value by a 16-bit value. Result fits in 16 bits */ |
| michael@0 | 129 | #define DIV32_16(a,b) ((opus_val16)(((opus_val32)(a))/((opus_val16)(b)))) |
| michael@0 | 130 | |
| michael@0 | 131 | /** Divide a 32-bit value by a 32-bit value. Result fits in 32 bits */ |
| michael@0 | 132 | #define DIV32(a,b) (((opus_val32)(a))/((opus_val32)(b))) |
| michael@0 | 133 | |
| michael@0 | 134 | #endif |
