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Diffstat (limited to 'thirdparty/opus/celt/entcode.c')
| -rw-r--r-- | thirdparty/opus/celt/entcode.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/thirdparty/opus/celt/entcode.c b/thirdparty/opus/celt/entcode.c deleted file mode 100644 index 70f32016ec..0000000000 --- a/thirdparty/opus/celt/entcode.c +++ /dev/null @@ -1,153 +0,0 @@ -/* Copyright (c) 2001-2011 Timothy B. Terriberry -*/ -/* - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - - Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER - OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -*/ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "entcode.h" -#include "arch.h" - -#if !defined(EC_CLZ) -/*This is a fallback for systems where we don't know how to access - a BSR or CLZ instruction (see ecintrin.h). - If you are optimizing Opus on a new platform and it has a native CLZ or - BZR (e.g. cell, MIPS, x86, etc) then making it available to Opus will be - an easy performance win.*/ -int ec_ilog(opus_uint32 _v){ - /*On a Pentium M, this branchless version tested as the fastest on - 1,000,000,000 random 32-bit integers, edging out a similar version with - branches, and a 256-entry LUT version.*/ - int ret; - int m; - ret=!!_v; - m=!!(_v&0xFFFF0000)<<4; - _v>>=m; - ret|=m; - m=!!(_v&0xFF00)<<3; - _v>>=m; - ret|=m; - m=!!(_v&0xF0)<<2; - _v>>=m; - ret|=m; - m=!!(_v&0xC)<<1; - _v>>=m; - ret|=m; - ret+=!!(_v&0x2); - return ret; -} -#endif - -#if 1 -/* This is a faster version of ec_tell_frac() that takes advantage - of the low (1/8 bit) resolution to use just a linear function - followed by a lookup to determine the exact transition thresholds. */ -opus_uint32 ec_tell_frac(ec_ctx *_this){ - static const unsigned correction[8] = - {35733, 38967, 42495, 46340, - 50535, 55109, 60097, 65535}; - opus_uint32 nbits; - opus_uint32 r; - int l; - unsigned b; - nbits=_this->nbits_total<<BITRES; - l=EC_ILOG(_this->rng); - r=_this->rng>>(l-16); - b = (r>>12)-8; - b += r>correction[b]; - l = (l<<3)+b; - return nbits-l; -} -#else -opus_uint32 ec_tell_frac(ec_ctx *_this){ - opus_uint32 nbits; - opus_uint32 r; - int l; - int i; - /*To handle the non-integral number of bits still left in the encoder/decoder - state, we compute the worst-case number of bits of val that must be - encoded to ensure that the value is inside the range for any possible - subsequent bits. - The computation here is independent of val itself (the decoder does not - even track that value), even though the real number of bits used after - ec_enc_done() may be 1 smaller if rng is a power of two and the - corresponding trailing bits of val are all zeros. - If we did try to track that special case, then coding a value with a - probability of 1/(1<<n) might sometimes appear to use more than n bits. - This may help explain the surprising result that a newly initialized - encoder or decoder claims to have used 1 bit.*/ - nbits=_this->nbits_total<<BITRES; - l=EC_ILOG(_this->rng); - r=_this->rng>>(l-16); - for(i=BITRES;i-->0;){ - int b; - r=r*r>>15; - b=(int)(r>>16); - l=l<<1|b; - r>>=b; - } - return nbits-l; -} -#endif - -#ifdef USE_SMALL_DIV_TABLE -/* Result of 2^32/(2*i+1), except for i=0. */ -const opus_uint32 SMALL_DIV_TABLE[129] = { - 0xFFFFFFFF, 0x55555555, 0x33333333, 0x24924924, - 0x1C71C71C, 0x1745D174, 0x13B13B13, 0x11111111, - 0x0F0F0F0F, 0x0D79435E, 0x0C30C30C, 0x0B21642C, - 0x0A3D70A3, 0x097B425E, 0x08D3DCB0, 0x08421084, - 0x07C1F07C, 0x07507507, 0x06EB3E45, 0x06906906, - 0x063E7063, 0x05F417D0, 0x05B05B05, 0x0572620A, - 0x05397829, 0x05050505, 0x04D4873E, 0x04A7904A, - 0x047DC11F, 0x0456C797, 0x04325C53, 0x04104104, - 0x03F03F03, 0x03D22635, 0x03B5CC0E, 0x039B0AD1, - 0x0381C0E0, 0x0369D036, 0x03531DEC, 0x033D91D2, - 0x0329161F, 0x03159721, 0x03030303, 0x02F14990, - 0x02E05C0B, 0x02D02D02, 0x02C0B02C, 0x02B1DA46, - 0x02A3A0FD, 0x0295FAD4, 0x0288DF0C, 0x027C4597, - 0x02702702, 0x02647C69, 0x02593F69, 0x024E6A17, - 0x0243F6F0, 0x0239E0D5, 0x02302302, 0x0226B902, - 0x021D9EAD, 0x0214D021, 0x020C49BA, 0x02040810, - 0x01FC07F0, 0x01F44659, 0x01ECC07B, 0x01E573AC, - 0x01DE5D6E, 0x01D77B65, 0x01D0CB58, 0x01CA4B30, - 0x01C3F8F0, 0x01BDD2B8, 0x01B7D6C3, 0x01B20364, - 0x01AC5701, 0x01A6D01A, 0x01A16D3F, 0x019C2D14, - 0x01970E4F, 0x01920FB4, 0x018D3018, 0x01886E5F, - 0x0183C977, 0x017F405F, 0x017AD220, 0x01767DCE, - 0x01724287, 0x016E1F76, 0x016A13CD, 0x01661EC6, - 0x01623FA7, 0x015E75BB, 0x015AC056, 0x01571ED3, - 0x01539094, 0x01501501, 0x014CAB88, 0x0149539E, - 0x01460CBC, 0x0142D662, 0x013FB013, 0x013C995A, - 0x013991C2, 0x013698DF, 0x0133AE45, 0x0130D190, - 0x012E025C, 0x012B404A, 0x01288B01, 0x0125E227, - 0x01234567, 0x0120B470, 0x011E2EF3, 0x011BB4A4, - 0x01194538, 0x0116E068, 0x011485F0, 0x0112358E, - 0x010FEF01, 0x010DB20A, 0x010B7E6E, 0x010953F3, - 0x01073260, 0x0105197F, 0x0103091B, 0x01010101 -}; -#endif |