The Tor Browser: media/libopus/celt/cwrs.c@6474c204b198 (annotated)

media/libopus/celt/cwrs.c@6474c204b198 (annotated)

media/libopus/celt/cwrs.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* Copyright (c) 2007-2008 CSIRO
    Copyright (c) 2007-2009 Xiph.Org Foundation
    Copyright (c) 2007-2009 Timothy B. Terriberry
    Written by Timothy B. Terriberry and Jean-Marc Valin */
 /*
    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 "os_support.h"
 #include "cwrs.h"
 #include "mathops.h"
 #include "arch.h"
 #ifdef CUSTOM_MODES
 /*Guaranteed to return a conservatively large estimate of the binary logarithm
    with frac bits of fractional precision.
   Tested for all possible 32-bit inputs with frac=4, where the maximum
    overestimation is 0.06254243 bits.*/
 int log2_frac(opus_uint32 val, int frac)
 {
   int l;
   l=EC_ILOG(val);
   if(val&(val-1)){
     /*This is (val>>l-16), but guaranteed to round up, even if adding a bias
        before the shift would cause overflow (e.g., for 0xFFFFxxxx).
        Doesn't work for val=0, but that case fails the test above.*/
     if(l>16)val=((val-1)>>(l-16))+1;
     else val<<=16-l;
     l=(l-1)<<frac;
     /*Note that we always need one iteration, since the rounding up above means
        that we might need to adjust the integer part of the logarithm.*/
     do{
       int b;
       b=(int)(val>>16);
       l+=b<<frac;
       val=(val+b)>>b;
       val=(val*val+0x7FFF)>>15;
     }
     while(frac-->0);
     /*If val is not exactly 0x8000, then we have to round up the remainder.*/
     return l+(val>0x8000);
   }
   /*Exact powers of two require no rounding.*/
   else return (l-1)<<frac;
 }
 #endif
 /*Although derived separately, the pulse vector coding scheme is equivalent to
    a Pyramid Vector Quantizer \cite{Fis86}.
   Some additional notes about an early version appear at
    http://people.xiph.org/~tterribe/notes/cwrs.html, but the codebook ordering
    and the definitions of some terms have evolved since that was written.
   The conversion from a pulse vector to an integer index (encoding) and back
    (decoding) is governed by two related functions, V(N,K) and U(N,K).
   V(N,K) = the number of combinations, with replacement, of N items, taken K
    at a time, when a sign bit is added to each item taken at least once (i.e.,
    the number of N-dimensional unit pulse vectors with K pulses).
   One way to compute this is via
     V(N,K) = K>0 ? sum(k=1...K,2**k*choose(N,k)*choose(K-1,k-1)) : 1,
    where choose() is the binomial function.
   A table of values for N<10 and K<10 looks like:
   V[10][10] = {
     {1,  0,   0,    0,    0,     0,     0,      0,      0,       0},
     {1,  2,   2,    2,    2,     2,     2,      2,      2,       2},
     {1,  4,   8,   12,   16,    20,    24,     28,     32,      36},
     {1,  6,  18,   38,   66,   102,   146,    198,    258,     326},
     {1,  8,  32,   88,  192,   360,   608,    952,   1408,    1992},
     {1, 10,  50,  170,  450,  1002,  1970,   3530,   5890,    9290},
     {1, 12,  72,  292,  912,  2364,  5336,  10836,  20256,   35436},
     {1, 14,  98,  462, 1666,  4942, 12642,  28814,  59906,  115598},
     {1, 16, 128,  688, 2816,  9424, 27008,  68464, 157184,  332688},
     {1, 18, 162,  978, 4482, 16722, 53154, 148626, 374274,  864146}
   };
   U(N,K) = the number of such combinations wherein N-1 objects are taken at
    most K-1 at a time.
   This is given by
     U(N,K) = sum(k=0...K-1,V(N-1,k))
            = K>0 ? (V(N-1,K-1) + V(N,K-1))/2 : 0.
   The latter expression also makes clear that U(N,K) is half the number of such
    combinations wherein the first object is taken at least once.
   Although it may not be clear from either of these definitions, U(N,K) is the
    natural function to work with when enumerating the pulse vector codebooks,
    not V(N,K).
   U(N,K) is not well-defined for N=0, but with the extension
     U(0,K) = K>0 ? 0 : 1,
    the function becomes symmetric: U(N,K) = U(K,N), with a similar table:
   U[10][10] = {
     {1, 0,  0,   0,    0,    0,     0,     0,      0,      0},
     {0, 1,  1,   1,    1,    1,     1,     1,      1,      1},
     {0, 1,  3,   5,    7,    9,    11,    13,     15,     17},
     {0, 1,  5,  13,   25,   41,    61,    85,    113,    145},
     {0, 1,  7,  25,   63,  129,   231,   377,    575,    833},
     {0, 1,  9,  41,  129,  321,   681,  1289,   2241,   3649},
     {0, 1, 11,  61,  231,  681,  1683,  3653,   7183,  13073},
     {0, 1, 13,  85,  377, 1289,  3653,  8989,  19825,  40081},
     {0, 1, 15, 113,  575, 2241,  7183, 19825,  48639, 108545},
     {0, 1, 17, 145,  833, 3649, 13073, 40081, 108545, 265729}
   };
   With this extension, V(N,K) may be written in terms of U(N,K):
     V(N,K) = U(N,K) + U(N,K+1)
    for all N>=0, K>=0.
   Thus U(N,K+1) represents the number of combinations where the first element
    is positive or zero, and U(N,K) represents the number of combinations where
    it is negative.
   With a large enough table of U(N,K) values, we could write O(N) encoding
    and O(min(N*log(K),N+K)) decoding routines, but such a table would be
    prohibitively large for small embedded devices (K may be as large as 32767
    for small N, and N may be as large as 200).
   Both functions obey the same recurrence relation:
     V(N,K) = V(N-1,K) + V(N,K-1) + V(N-1,K-1),
     U(N,K) = U(N-1,K) + U(N,K-1) + U(N-1,K-1),
    for all N>0, K>0, with different initial conditions at N=0 or K=0.
   This allows us to construct a row of one of the tables above given the
    previous row or the next row.
   Thus we can derive O(NK) encoding and decoding routines with O(K) memory
    using only addition and subtraction.
   When encoding, we build up from the U(2,K) row and work our way forwards.
   When decoding, we need to start at the U(N,K) row and work our way backwards,
    which requires a means of computing U(N,K).
   U(N,K) may be computed from two previous values with the same N:
     U(N,K) = ((2*N-1)*U(N,K-1) - U(N,K-2))/(K-1) + U(N,K-2)
    for all N>1, and since U(N,K) is symmetric, a similar relation holds for two
    previous values with the same K:
     U(N,K>1) = ((2*K-1)*U(N-1,K) - U(N-2,K))/(N-1) + U(N-2,K)
    for all K>1.
   This allows us to construct an arbitrary row of the U(N,K) table by starting
    with the first two values, which are constants.
   This saves roughly 2/3 the work in our O(NK) decoding routine, but costs O(K)
    multiplications.
   Similar relations can be derived for V(N,K), but are not used here.
   For N>0 and K>0, U(N,K) and V(N,K) take on the form of an (N-1)-degree
    polynomial for fixed N.
   The first few are
     U(1,K) = 1,
     U(2,K) = 2*K-1,
     U(3,K) = (2*K-2)*K+1,
     U(4,K) = (((4*K-6)*K+8)*K-3)/3,
     U(5,K) = ((((2*K-4)*K+10)*K-8)*K+3)/3,
    and
     V(1,K) = 2,
     V(2,K) = 4*K,
     V(3,K) = 4*K*K+2,
     V(4,K) = 8*(K*K+2)*K/3,
     V(5,K) = ((4*K*K+20)*K*K+6)/3,
    for all K>0.
   This allows us to derive O(N) encoding and O(N*log(K)) decoding routines for
    small N (and indeed decoding is also O(N) for N<3).
   @ARTICLE{Fis86,
     author="Thomas R. Fischer",
     title="A Pyramid Vector Quantizer",
     journal="IEEE Transactions on Information Theory",
     volume="IT-32",
     number=4,
     pages="568--583",
     month=Jul,
     year=1986
   }*/
 #if !defined(SMALL_FOOTPRINT)
 /*U(N,K) = U(K,N) := N>0?K>0?U(N-1,K)+U(N,K-1)+U(N-1,K-1):0:K>0?1:0*/
 # define CELT_PVQ_U(_n,_k) (CELT_PVQ_U_ROW[IMIN(_n,_k)][IMAX(_n,_k)])
 /*V(N,K) := U(N,K)+U(N,K+1) = the number of PVQ codewords for a band of size N
    with K pulses allocated to it.*/
 # define CELT_PVQ_V(_n,_k) (CELT_PVQ_U(_n,_k)+CELT_PVQ_U(_n,(_k)+1))
 /*For each V(N,K) supported, we will access element U(min(N,K+1),max(N,K+1)).
   Thus, the number of entries in row I is the larger of the maximum number of
    pulses we will ever allocate for a given N=I (K=128, or however many fit in
 bits, whichever is smaller), plus one, and the maximum N for which
    K=I-1 pulses fit in 32 bits.
   The largest band size in an Opus Custom mode is 208.
   Otherwise, we can limit things to the set of N which can be achieved by
    splitting a band from a standard Opus mode: 176, 144, 96, 88, 72, 64, 48,
 , 36, 32, 24, 22, 18, 16, 8, 4, 2).*/
 #if defined(CUSTOM_MODES)
 static const opus_uint32 CELT_PVQ_U_DATA[1488]={
 #else
 static const opus_uint32 CELT_PVQ_U_DATA[1272]={
 #endif
   /*N=0, K=0...176:*/
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 #if defined(CUSTOM_MODES)
   /*...208:*/
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0,
 #endif
   /*N=1, K=1...176:*/
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 #if defined(CUSTOM_MODES)
   /*...208:*/
 , 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 , 1, 1, 1, 1, 1,
 #endif
   /*N=2, K=2...176:*/
 , 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41,
 , 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79,
 , 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113,
 , 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143,
 , 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173,
 , 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203,
 , 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233,
 , 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263,
 , 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293,
 , 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323,
 , 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351,
 #if defined(CUSTOM_MODES)
   /*...208:*/
 , 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379, 381,
 , 385, 387, 389, 391, 393, 395, 397, 399, 401, 403, 405, 407, 409, 411,
 , 415,
 #endif
   /*N=3, K=3...176:*/
 , 25, 41, 61, 85, 113, 145, 181, 221, 265, 313, 365, 421, 481, 545, 613,
 , 761, 841, 925, 1013, 1105, 1201, 1301, 1405, 1513, 1625, 1741, 1861,
 , 2113, 2245, 2381, 2521, 2665, 2813, 2965, 3121, 3281, 3445, 3613, 3785,
 , 4141, 4325, 4513, 4705, 4901, 5101, 5305, 5513, 5725, 5941, 6161, 6385,
 , 6845, 7081, 7321, 7565, 7813, 8065, 8321, 8581, 8845, 9113, 9385, 9661,
 , 10225, 10513, 10805, 11101, 11401, 11705, 12013, 12325, 12641, 12961,
 , 13613, 13945, 14281, 14621, 14965, 15313, 15665, 16021, 16381, 16745,
 , 17485, 17861, 18241, 18625, 19013, 19405, 19801, 20201, 20605, 21013,
 , 21841, 22261, 22685, 23113, 23545, 23981, 24421, 24865, 25313, 25765,
 , 26681, 27145, 27613, 28085, 28561, 29041, 29525, 30013, 30505, 31001,
 , 32005, 32513, 33025, 33541, 34061, 34585, 35113, 35645, 36181, 36721,
 , 37813, 38365, 38921, 39481, 40045, 40613, 41185, 41761, 42341, 42925,
 , 44105, 44701, 45301, 45905, 46513, 47125, 47741, 48361, 48985, 49613,
 , 50881, 51521, 52165, 52813, 53465, 54121, 54781, 55445, 56113, 56785,
 , 58141, 58825, 59513, 60205, 60901, 61601,
 #if defined(CUSTOM_MODES)
   /*...208:*/
 , 63013, 63725, 64441, 65161, 65885, 66613, 67345, 68081, 68821, 69565,
 , 71065, 71821, 72581, 73345, 74113, 74885, 75661, 76441, 77225, 78013,
 , 79601, 80401, 81205, 82013, 82825, 83641, 84461, 85285, 86113,
 #endif
   /*N=4, K=4...176:*/
 , 129, 231, 377, 575, 833, 1159, 1561, 2047, 2625, 3303, 4089, 4991, 6017,
 , 8473, 9919, 11521, 13287, 15225, 17343, 19649, 22151, 24857, 27775,
 , 34279, 37881, 41727, 45825, 50183, 54809, 59711, 64897, 70375, 76153,
 , 88641, 95367, 102425, 109823, 117569, 125671, 134137, 142975, 152193,
 , 171801, 182207, 193025, 204263, 215929, 228031, 240577, 253575,
 , 280959, 295361, 310247, 325625, 341503, 357889, 374791, 392217,
 , 428673, 447719, 467321, 487487, 508225, 529543, 551449, 573951,
 , 620775, 645113, 670079, 695681, 721927, 748825, 776383, 804609,
 , 863097, 893375, 924353, 956039, 988441, 1021567, 1055425, 1090023,
   1125369, 1161471, 1198337, 1235975, 1274393, 1313599, 1353601, 1394407,
   1436025, 1478463, 1521729, 1565831, 1610777, 1656575, 1703233, 1750759,
   1799161, 1848447, 1898625, 1949703, 2001689, 2054591, 2108417, 2163175,
   2218873, 2275519, 2333121, 2391687, 2451225, 2511743, 2573249, 2635751,
   2699257, 2763775, 2829313, 2895879, 2963481, 3032127, 3101825, 3172583,
   3244409, 3317311, 3391297, 3466375, 3542553, 3619839, 3698241, 3777767,
   3858425, 3940223, 4023169, 4107271, 4192537, 4278975, 4366593, 4455399,
   4545401, 4636607, 4729025, 4822663, 4917529, 5013631, 5110977, 5209575,
   5309433, 5410559, 5512961, 5616647, 5721625, 5827903, 5935489, 6044391,
   6154617, 6266175, 6379073, 6493319, 6608921, 6725887, 6844225, 6963943,
   7085049, 7207551,
 #if defined(CUSTOM_MODES)
   /*...208:*/
   7331457, 7456775, 7583513, 7711679, 7841281, 7972327, 8104825, 8238783,
   8374209, 8511111, 8649497, 8789375, 8930753, 9073639, 9218041, 9363967,
   9511425, 9660423, 9810969, 9963071, 10116737, 10271975, 10428793, 10587199,
   10747201, 10908807, 11072025, 11236863, 11403329, 11571431, 11741177,
   11912575,
 #endif
   /*N=5, K=5...176:*/
 , 681, 1289, 2241, 3649, 5641, 8361, 11969, 16641, 22569, 29961, 39041,
 , 63241, 78889, 97281, 118721, 143529, 172041, 204609, 241601, 283401,
 , 383041, 441729, 506921, 579081, 658689, 746241, 842249, 947241,
   1061761, 1186369, 1321641, 1468169, 1626561, 1797441, 1981449, 2179241,
   2391489, 2618881, 2862121, 3121929, 3399041, 3694209, 4008201, 4341801,
   4695809, 5071041, 5468329, 5888521, 6332481, 6801089, 7295241, 7815849,
   8363841, 8940161, 9545769, 10181641, 10848769, 11548161, 12280841, 13047849,
   13850241, 14689089, 15565481, 16480521, 17435329, 18431041, 19468809,
   20549801, 21675201, 22846209, 24064041, 25329929, 26645121, 28010881,
   29428489, 30899241, 32424449, 34005441, 35643561, 37340169, 39096641,
   40914369, 42794761, 44739241, 46749249, 48826241, 50971689, 53187081,
   55473921, 57833729, 60268041, 62778409, 65366401, 68033601, 70781609,
   73612041, 76526529, 79526721, 82614281, 85790889, 89058241, 92418049,
   95872041, 99421961, 103069569, 106816641, 110664969, 114616361, 118672641,
   122835649, 127107241, 131489289, 135983681, 140592321, 145317129, 150160041,
   155123009, 160208001, 165417001, 170752009, 176215041, 181808129, 187533321,
   193392681, 199388289, 205522241, 211796649, 218213641, 224775361, 231483969,
   238341641, 245350569, 252512961, 259831041, 267307049, 274943241, 282741889,
   290705281, 298835721, 307135529, 315607041, 324252609, 333074601, 342075401,
   351257409, 360623041, 370174729, 379914921, 389846081, 399970689, 410291241,
   420810249, 431530241, 442453761, 453583369, 464921641, 476471169, 488234561,
   500214441, 512413449, 524834241, 537479489, 550351881, 563454121, 576788929,
   590359041, 604167209, 618216201, 632508801,
 #if defined(CUSTOM_MODES)
   /*...208:*/
   647047809, 661836041, 676876329, 692171521, 707724481, 723538089, 739615241,
   755958849, 772571841, 789457161, 806617769, 824056641, 841776769, 859781161,
   878072841, 896654849, 915530241, 934702089, 954173481, 973947521, 994027329,
   1014416041, 1035116809, 1056132801, 1077467201, 1099123209, 1121104041,
   1143412929, 1166053121, 1189027881, 1212340489, 1235994241,
 #endif
   /*N=6, K=6...96:*/
 , 3653, 7183, 13073, 22363, 36365, 56695, 85305, 124515, 177045, 246047,
 , 448427, 590557, 766727, 982729, 1244979, 1560549, 1937199, 2383409,
   2908411, 3522221, 4235671, 5060441, 6009091, 7095093, 8332863, 9737793,
   11326283, 13115773, 15124775, 17372905, 19880915, 22670725, 25765455,
   29189457, 32968347, 37129037, 41699767, 46710137, 52191139, 58175189,
   64696159, 71789409, 79491819, 87841821, 96879431, 106646281, 117185651,
   128542501, 140763503, 153897073, 167993403, 183104493, 199284183, 216588185,
   235074115, 254801525, 275831935, 298228865, 322057867, 347386557, 374284647,
   402823977, 433078547, 465124549, 499040399, 534906769, 572806619, 612825229,
   655050231, 699571641, 746481891, 795875861, 847850911, 902506913, 959946283,
   1020274013, 1083597703, 1150027593, 1219676595, 1292660325, 1369097135,
   1449108145, 1532817275, 1620351277, 1711839767, 1807415257, 1907213187,
   2011371957, 2120032959,
 #if defined(CUSTOM_MODES)
   /*...109:*/
   2233340609U, 2351442379U, 2474488829U, 2602633639U, 2736033641U, 2874848851U,
   3019242501U, 3169381071U, 3325434321U, 3487575323U, 3655980493U, 3830829623U,
   4012305913U,
 #endif
   /*N=7, K=7...54*/
 , 19825, 40081, 75517, 134245, 227305, 369305, 579125, 880685, 1303777,
   1884961, 2668525, 3707509, 5064793, 6814249, 9041957, 11847485, 15345233,
   19665841, 24957661, 31388293, 39146185, 48442297, 59511829, 72616013,
   88043969, 106114625, 127178701, 151620757, 179861305, 212358985, 249612805,
   292164445, 340600625, 395555537, 457713341, 527810725, 606639529, 695049433,
   793950709, 904317037, 1027188385, 1163673953, 1314955181, 1482288821,
   1667010073, 1870535785, 2094367717,
 #if defined(CUSTOM_MODES)
   /*...60:*/
   2340095869U, 2609401873U, 2904062449U, 3225952925U, 3577050821U, 3959439497U,
 #endif
   /*N=8, K=8...37*/
 , 108545, 224143, 433905, 795455, 1392065, 2340495, 3800305, 5984767,
   9173505, 13726991, 20103025, 28875327, 40754369, 56610575, 77500017,
   104692735, 139703809, 184327311, 240673265, 311207743, 398796225, 506750351,
   638878193, 799538175, 993696769, 1226990095, 1505789553, 1837271615,
   2229491905U,
 #if defined(CUSTOM_MODES)
   /*...40:*/
   2691463695U, 3233240945U, 3866006015U,
 #endif
   /*N=9, K=9...28:*/
 , 598417, 1256465, 2485825, 4673345, 8405905, 14546705, 24331777,
   39490049, 62390545, 96220561, 145198913, 214828609, 312193553, 446304145,
   628496897, 872893441, 1196924561, 1621925137, 2173806145U,
 #if defined(CUSTOM_MODES)
   /*...29:*/
   2883810113U,
 #endif
   /*N=10, K=10...24:*/
   1462563, 3317445, 7059735, 14218905, 27298155, 50250765, 89129247, 152951073,
   254831667, 413442773, 654862247, 1014889769, 1541911931, 2300409629U,
   3375210671U,
   /*N=11, K=11...19:*/
   8097453, 18474633, 39753273, 81270333, 158819253, 298199265, 540279585,
   948062325, 1616336765,
 #if defined(CUSTOM_MODES)
   /*...20:*/
   2684641785U,
 #endif
   /*N=12, K=12...18:*/
   45046719, 103274625, 224298231, 464387817, 921406335, 1759885185,
   3248227095U,
   /*N=13, K=13...16:*/
   251595969, 579168825, 1267854873, 2653649025U,
   /*N=14, K=14:*/
   1409933619
 };
 #if defined(CUSTOM_MODES)
 static const opus_uint32 *const CELT_PVQ_U_ROW[15]={
   CELT_PVQ_U_DATA+   0,CELT_PVQ_U_DATA+ 208,CELT_PVQ_U_DATA+ 415,
   CELT_PVQ_U_DATA+ 621,CELT_PVQ_U_DATA+ 826,CELT_PVQ_U_DATA+1030,
   CELT_PVQ_U_DATA+1233,CELT_PVQ_U_DATA+1336,CELT_PVQ_U_DATA+1389,
   CELT_PVQ_U_DATA+1421,CELT_PVQ_U_DATA+1441,CELT_PVQ_U_DATA+1455,
   CELT_PVQ_U_DATA+1464,CELT_PVQ_U_DATA+1470,CELT_PVQ_U_DATA+1473
 };
 #else
 static const opus_uint32 *const CELT_PVQ_U_ROW[15]={
   CELT_PVQ_U_DATA+   0,CELT_PVQ_U_DATA+ 176,CELT_PVQ_U_DATA+ 351,
   CELT_PVQ_U_DATA+ 525,CELT_PVQ_U_DATA+ 698,CELT_PVQ_U_DATA+ 870,
   CELT_PVQ_U_DATA+1041,CELT_PVQ_U_DATA+1131,CELT_PVQ_U_DATA+1178,
   CELT_PVQ_U_DATA+1207,CELT_PVQ_U_DATA+1226,CELT_PVQ_U_DATA+1240,
   CELT_PVQ_U_DATA+1248,CELT_PVQ_U_DATA+1254,CELT_PVQ_U_DATA+1257
 };
 #endif
 #if defined(CUSTOM_MODES)
 void get_required_bits(opus_int16 *_bits,int _n,int _maxk,int _frac){
   int k;
   /*_maxk==0 => there's nothing to do.*/
   celt_assert(_maxk>0);
   _bits[0]=0;
   for(k=1;k<=_maxk;k++)_bits[k]=log2_frac(CELT_PVQ_V(_n,k),_frac);
 }
 #endif
 static opus_uint32 icwrs(int _n,const int *_y){
   opus_uint32 i;
   int         j;
   int         k;
   celt_assert(_n>=2);
   j=_n-1;
   i=_y[j]<0;
   k=abs(_y[j]);
   do{
     j--;
     i+=CELT_PVQ_U(_n-j,k);
     k+=abs(_y[j]);
     if(_y[j]<0)i+=CELT_PVQ_U(_n-j,k+1);
   }
   while(j>0);
   return i;
 }
 void encode_pulses(const int *_y,int _n,int _k,ec_enc *_enc){
   celt_assert(_k>0);
   ec_enc_uint(_enc,icwrs(_n,_y),CELT_PVQ_V(_n,_k));
 }
 static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
   opus_uint32 p;
   int         s;
   int         k0;
   celt_assert(_k>0);
   celt_assert(_n>1);
   while(_n>2){
     opus_uint32 q;
     /*Lots of pulses case:*/
     if(_k>=_n){
       const opus_uint32 *row;
       row=CELT_PVQ_U_ROW[_n];
       /*Are the pulses in this dimension negative?*/
       p=row[_k+1];
       s=-(_i>=p);
       _i-=p&s;
       /*Count how many pulses were placed in this dimension.*/
       k0=_k;
       q=row[_n];
       if(q>_i){
         celt_assert(p>q);
         _k=_n;
         do p=CELT_PVQ_U_ROW[--_k][_n];
         while(p>_i);
       }
       else for(p=row[_k];p>_i;p=row[_k])_k--;
       _i-=p;
       *_y++=(k0-_k+s)^s;
     }
     /*Lots of dimensions case:*/
     else{
       /*Are there any pulses in this dimension at all?*/
       p=CELT_PVQ_U_ROW[_k][_n];
       q=CELT_PVQ_U_ROW[_k+1][_n];
       if(p<=_i&&_i<q){
         _i-=p;
         *_y++=0;
       }
       else{
         /*Are the pulses in this dimension negative?*/
         s=-(_i>=q);
         _i-=q&s;
         /*Count how many pulses were placed in this dimension.*/
         k0=_k;
         do p=CELT_PVQ_U_ROW[--_k][_n];
         while(p>_i);
         _i-=p;
         *_y++=(k0-_k+s)^s;
       }
     }
     _n--;
   }
   /*_n==2*/
   p=2*_k+1;
   s=-(_i>=p);
   _i-=p&s;
   k0=_k;
   _k=(_i+1)>>1;
   if(_k)_i-=2*_k-1;
   *_y++=(k0-_k+s)^s;
   /*_n==1*/
   s=-(int)_i;
   *_y=(_k+s)^s;
 }
 void decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
   cwrsi(_n,_k,ec_dec_uint(_dec,CELT_PVQ_V(_n,_k)),_y);
 }
 #else /* SMALL_FOOTPRINT */
 /*Computes the next row/column of any recurrence that obeys the relation
    u[i][j]=u[i-1][j]+u[i][j-1]+u[i-1][j-1].
   _ui0 is the base case for the new row/column.*/
 static OPUS_INLINE void unext(opus_uint32 *_ui,unsigned _len,opus_uint32 _ui0){
   opus_uint32 ui1;
   unsigned      j;
   /*This do-while will overrun the array if we don't have storage for at least
 values.*/
   j=1; do {
     ui1=UADD32(UADD32(_ui[j],_ui[j-1]),_ui0);
     _ui[j-1]=_ui0;
     _ui0=ui1;
   } while (++j<_len);
   _ui[j-1]=_ui0;
 }
 /*Computes the previous row/column of any recurrence that obeys the relation
    u[i-1][j]=u[i][j]-u[i][j-1]-u[i-1][j-1].
   _ui0 is the base case for the new row/column.*/
 static OPUS_INLINE void uprev(opus_uint32 *_ui,unsigned _n,opus_uint32 _ui0){
   opus_uint32 ui1;
   unsigned      j;
   /*This do-while will overrun the array if we don't have storage for at least
 values.*/
   j=1; do {
     ui1=USUB32(USUB32(_ui[j],_ui[j-1]),_ui0);
     _ui[j-1]=_ui0;
     _ui0=ui1;
   } while (++j<_n);
   _ui[j-1]=_ui0;
 }
 /*Compute V(_n,_k), as well as U(_n,0..._k+1).
   _u: On exit, _u[i] contains U(_n,i) for i in [0..._k+1].*/
 static opus_uint32 ncwrs_urow(unsigned _n,unsigned _k,opus_uint32 *_u){
   opus_uint32 um2;
   unsigned      len;
   unsigned      k;
   len=_k+2;
   /*We require storage at least 3 values (e.g., _k>0).*/
   celt_assert(len>=3);
   _u[0]=0;
   _u[1]=um2=1;
   /*If _n==0, _u[0] should be 1 and the rest should be 0.*/
   /*If _n==1, _u[i] should be 1 for i>1.*/
   celt_assert(_n>=2);
   /*If _k==0, the following do-while loop will overflow the buffer.*/
   celt_assert(_k>0);
   k=2;
   do _u[k]=(k<<1)-1;
   while(++k<len);
   for(k=2;k<_n;k++)unext(_u+1,_k+1,1);
   return _u[_k]+_u[_k+1];
 }
 /*Returns the _i'th combination of _k elements chosen from a set of size _n
    with associated sign bits.
   _y: Returns the vector of pulses.
   _u: Must contain entries [0..._k+1] of row _n of U() on input.
       Its contents will be destructively modified.*/
 static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y,opus_uint32 *_u){
   int j;
   celt_assert(_n>0);
   j=0;
   do{
     opus_uint32 p;
     int           s;
     int           yj;
     p=_u[_k+1];
     s=-(_i>=p);
     _i-=p&s;
     yj=_k;
     p=_u[_k];
     while(p>_i)p=_u[--_k];
     _i-=p;
     yj-=_k;
     _y[j]=(yj+s)^s;
     uprev(_u,_k+2,0);
   }
   while(++j<_n);
 }
 /*Returns the index of the given combination of K elements chosen from a set
    of size 1 with associated sign bits.
   _y: The vector of pulses, whose sum of absolute values is K.
   _k: Returns K.*/
 static OPUS_INLINE opus_uint32 icwrs1(const int *_y,int *_k){
   *_k=abs(_y[0]);
   return _y[0]<0;
 }
 /*Returns the index of the given combination of K elements chosen from a set
    of size _n with associated sign bits.
   _y:  The vector of pulses, whose sum of absolute values must be _k.
   _nc: Returns V(_n,_k).*/
 static OPUS_INLINE opus_uint32 icwrs(int _n,int _k,opus_uint32 *_nc,const int *_y,
  opus_uint32 *_u){
   opus_uint32 i;
   int         j;
   int         k;
   /*We can't unroll the first two iterations of the loop unless _n>=2.*/
   celt_assert(_n>=2);
   _u[0]=0;
   for(k=1;k<=_k+1;k++)_u[k]=(k<<1)-1;
   i=icwrs1(_y+_n-1,&k);
   j=_n-2;
   i+=_u[k];
   k+=abs(_y[j]);
   if(_y[j]<0)i+=_u[k+1];
   while(j-->0){
     unext(_u,_k+2,0);
     i+=_u[k];
     k+=abs(_y[j]);
     if(_y[j]<0)i+=_u[k+1];
   }
   *_nc=_u[k]+_u[k+1];
   return i;
 }
 #ifdef CUSTOM_MODES
 void get_required_bits(opus_int16 *_bits,int _n,int _maxk,int _frac){
   int k;
   /*_maxk==0 => there's nothing to do.*/
   celt_assert(_maxk>0);
   _bits[0]=0;
   if (_n==1)
   {
     for (k=1;k<=_maxk;k++)
       _bits[k] = 1<<_frac;
   }
   else {
     VARDECL(opus_uint32,u);
     SAVE_STACK;
     ALLOC(u,_maxk+2U,opus_uint32);
     ncwrs_urow(_n,_maxk,u);
     for(k=1;k<=_maxk;k++)
       _bits[k]=log2_frac(u[k]+u[k+1],_frac);
     RESTORE_STACK;
   }
 }
 #endif /* CUSTOM_MODES */
 void encode_pulses(const int *_y,int _n,int _k,ec_enc *_enc){
   opus_uint32 i;
   VARDECL(opus_uint32,u);
   opus_uint32 nc;
   SAVE_STACK;
   celt_assert(_k>0);
   ALLOC(u,_k+2U,opus_uint32);
   i=icwrs(_n,_k,&nc,_y,u);
   ec_enc_uint(_enc,i,nc);
   RESTORE_STACK;
 }
 void decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
   VARDECL(opus_uint32,u);
   SAVE_STACK;
   celt_assert(_k>0);
   ALLOC(u,_k+2U,opus_uint32);
   cwrsi(_n,_k,ec_dec_uint(_dec,ncwrs_urow(_n,_k,u)),_y,u);
   RESTORE_STACK;
 }
 #endif /* SMALL_FOOTPRINT */

The Tor Browser / annotate

media/libopus/celt/cwrs.c@6474c204b198 (annotated)

media/libopus/celt/cwrs.c