9b7ec42403
Sync to commit bb4b6885a139644cf3ac14e7deda9f633ec2d93c
This brings in a bunch of optimizations to decode speed
and memory usage. Allocations are switched from using
the pseudostack to using the real stack. Enabled hacks
to reduce stack usage.
This should fix crashes on sansa clip, although some
files will not play due to failing allocations in the
codec buffer.
Speeds up decoding of the following test files:
H300 (cf) C200 (arm7tdmi) ipod classic (arm9e)
16 kbps (silk) 14.28 MHz 4.00 MHz 2.61 MHz
64 kbps (celt) 4.09 MHz 8.08 MHz 6.24 MHz
128 kbps (celt) 1.93 MHz 8.83 MHz 6.53 MHz
Change-Id: I851733a8a5824b61feb363a173091bc7e6629b58
153 lines
5.6 KiB
C
153 lines
5.6 KiB
C
/* Copyright (c) 2001-2011 Timothy B. Terriberry
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*/
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/*
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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
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are 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 copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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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 OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "entcode.h"
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#include "arch.h"
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#if !defined(EC_CLZ)
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/*This is a fallback for systems where we don't know how to access
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a BSR or CLZ instruction (see ecintrin.h).
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If you are optimizing Opus on a new platform and it has a native CLZ or
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BZR (e.g. cell, MIPS, x86, etc) then making it available to Opus will be
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an easy performance win.*/
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int ec_ilog(opus_uint32 _v){
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/*On a Pentium M, this branchless version tested as the fastest on
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1,000,000,000 random 32-bit integers, edging out a similar version with
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branches, and a 256-entry LUT version.*/
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int ret;
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int m;
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ret=!!_v;
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m=!!(_v&0xFFFF0000)<<4;
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_v>>=m;
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ret|=m;
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m=!!(_v&0xFF00)<<3;
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_v>>=m;
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ret|=m;
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m=!!(_v&0xF0)<<2;
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_v>>=m;
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ret|=m;
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m=!!(_v&0xC)<<1;
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_v>>=m;
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ret|=m;
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ret+=!!(_v&0x2);
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return ret;
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}
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#endif
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#if 1
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/* This is a faster version of ec_tell_frac() that takes advantage
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of the low (1/8 bit) resolution to use just a linear function
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followed by a lookup to determine the exact transition thresholds. */
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opus_uint32 ec_tell_frac(ec_ctx *_this){
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static const unsigned correction[8] =
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{35733, 38967, 42495, 46340,
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50535, 55109, 60097, 65535};
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opus_uint32 nbits;
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opus_uint32 r;
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int l;
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unsigned b;
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nbits=_this->nbits_total<<BITRES;
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l=EC_ILOG(_this->rng);
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r=_this->rng>>(l-16);
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b = (r>>12)-8;
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b += r>correction[b];
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l = (l<<3)+b;
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return nbits-l;
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}
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#else
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opus_uint32 ec_tell_frac(ec_ctx *_this){
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opus_uint32 nbits;
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opus_uint32 r;
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int l;
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int i;
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/*To handle the non-integral number of bits still left in the encoder/decoder
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state, we compute the worst-case number of bits of val that must be
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encoded to ensure that the value is inside the range for any possible
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subsequent bits.
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The computation here is independent of val itself (the decoder does not
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even track that value), even though the real number of bits used after
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ec_enc_done() may be 1 smaller if rng is a power of two and the
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corresponding trailing bits of val are all zeros.
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If we did try to track that special case, then coding a value with a
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probability of 1/(1<<n) might sometimes appear to use more than n bits.
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This may help explain the surprising result that a newly initialized
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encoder or decoder claims to have used 1 bit.*/
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nbits=_this->nbits_total<<BITRES;
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l=EC_ILOG(_this->rng);
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r=_this->rng>>(l-16);
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for(i=BITRES;i-->0;){
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int b;
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r=r*r>>15;
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b=(int)(r>>16);
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l=l<<1|b;
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r>>=b;
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}
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return nbits-l;
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}
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#endif
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#ifdef USE_SMALL_DIV_TABLE
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/* Result of 2^32/(2*i+1), except for i=0. */
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const opus_uint32 SMALL_DIV_TABLE[129] ICONST_ATTR = {
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0xFFFFFFFF, 0x55555555, 0x33333333, 0x24924924,
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0x1C71C71C, 0x1745D174, 0x13B13B13, 0x11111111,
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0x0F0F0F0F, 0x0D79435E, 0x0C30C30C, 0x0B21642C,
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0x0A3D70A3, 0x097B425E, 0x08D3DCB0, 0x08421084,
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0x07C1F07C, 0x07507507, 0x06EB3E45, 0x06906906,
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0x063E7063, 0x05F417D0, 0x05B05B05, 0x0572620A,
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0x05397829, 0x05050505, 0x04D4873E, 0x04A7904A,
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0x047DC11F, 0x0456C797, 0x04325C53, 0x04104104,
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0x03F03F03, 0x03D22635, 0x03B5CC0E, 0x039B0AD1,
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0x0381C0E0, 0x0369D036, 0x03531DEC, 0x033D91D2,
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0x0329161F, 0x03159721, 0x03030303, 0x02F14990,
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0x02E05C0B, 0x02D02D02, 0x02C0B02C, 0x02B1DA46,
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0x02A3A0FD, 0x0295FAD4, 0x0288DF0C, 0x027C4597,
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0x02702702, 0x02647C69, 0x02593F69, 0x024E6A17,
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0x0243F6F0, 0x0239E0D5, 0x02302302, 0x0226B902,
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0x021D9EAD, 0x0214D021, 0x020C49BA, 0x02040810,
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0x01FC07F0, 0x01F44659, 0x01ECC07B, 0x01E573AC,
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0x01DE5D6E, 0x01D77B65, 0x01D0CB58, 0x01CA4B30,
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0x01C3F8F0, 0x01BDD2B8, 0x01B7D6C3, 0x01B20364,
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0x01AC5701, 0x01A6D01A, 0x01A16D3F, 0x019C2D14,
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0x01970E4F, 0x01920FB4, 0x018D3018, 0x01886E5F,
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0x0183C977, 0x017F405F, 0x017AD220, 0x01767DCE,
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0x01724287, 0x016E1F76, 0x016A13CD, 0x01661EC6,
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0x01623FA7, 0x015E75BB, 0x015AC056, 0x01571ED3,
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0x01539094, 0x01501501, 0x014CAB88, 0x0149539E,
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0x01460CBC, 0x0142D662, 0x013FB013, 0x013C995A,
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0x013991C2, 0x013698DF, 0x0133AE45, 0x0130D190,
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0x012E025C, 0x012B404A, 0x01288B01, 0x0125E227,
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0x01234567, 0x0120B470, 0x011E2EF3, 0x011BB4A4,
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0x01194538, 0x0116E068, 0x011485F0, 0x0112358E,
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0x010FEF01, 0x010DB20A, 0x010B7E6E, 0x010953F3,
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0x01073260, 0x0105197F, 0x0103091B, 0x01010101
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};
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#endif
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