The Tor Browser: media/libopus/celt/celt.c@b8a032363ba2 (annotated)

media/libopus/celt/celt.c@b8a032363ba2 (annotated)

media/libopus/celt/celt.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* Copyright (c) 2007-2008 CSIRO
    Copyright (c) 2007-2010 Xiph.Org Foundation
    Copyright (c) 2008 Gregory Maxwell
    Written by Jean-Marc Valin and Gregory Maxwell */
 /*
    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
 #define CELT_C
 #include "os_support.h"
 #include "mdct.h"
 #include <math.h>
 #include "celt.h"
 #include "pitch.h"
 #include "bands.h"
 #include "modes.h"
 #include "entcode.h"
 #include "quant_bands.h"
 #include "rate.h"
 #include "stack_alloc.h"
 #include "mathops.h"
 #include "float_cast.h"
 #include <stdarg.h>
 #include "celt_lpc.h"
 #include "vq.h"
 #ifndef PACKAGE_VERSION
 #define PACKAGE_VERSION "unknown"
 #endif
 int resampling_factor(opus_int32 rate)
 {
    int ret;
    switch (rate)
    {
    case 48000:
       ret = 1;
       break;
    case 24000:
       ret = 2;
       break;
    case 16000:
       ret = 3;
       break;
    case 12000:
       ret = 4;
       break;
    case 8000:
       ret = 6;
       break;
    default:
 #ifndef CUSTOM_MODES
       celt_assert(0);
 #endif
       ret = 0;
       break;
    }
    return ret;
 }
 #ifndef OVERRIDE_COMB_FILTER_CONST
 static void comb_filter_const(opus_val32 *y, opus_val32 *x, int T, int N,
       opus_val16 g10, opus_val16 g11, opus_val16 g12)
 {
    opus_val32 x0, x1, x2, x3, x4;
    int i;
    x4 = x[-T-2];
    x3 = x[-T-1];
    x2 = x[-T];
    x1 = x[-T+1];
    for (i=0;i<N;i++)
    {
       x0=x[i-T+2];
       y[i] = x[i]
                + MULT16_32_Q15(g10,x2)
                + MULT16_32_Q15(g11,ADD32(x1,x3))
                + MULT16_32_Q15(g12,ADD32(x0,x4));
       x4=x3;
       x3=x2;
       x2=x1;
       x1=x0;
    }
 }
 #endif
 void comb_filter(opus_val32 *y, opus_val32 *x, int T0, int T1, int N,
       opus_val16 g0, opus_val16 g1, int tapset0, int tapset1,
       const opus_val16 *window, int overlap)
 {
    int i;
    /* printf ("%d %d %f %f\n", T0, T1, g0, g1); */
    opus_val16 g00, g01, g02, g10, g11, g12;
    opus_val32 x0, x1, x2, x3, x4;
    static const opus_val16 gains[3][3] = {
          {QCONST16(0.3066406250f, 15), QCONST16(0.2170410156f, 15), QCONST16(0.1296386719f, 15)},
          {QCONST16(0.4638671875f, 15), QCONST16(0.2680664062f, 15), QCONST16(0.f, 15)},
          {QCONST16(0.7998046875f, 15), QCONST16(0.1000976562f, 15), QCONST16(0.f, 15)}};
    if (g0==0 && g1==0)
    {
       /* OPT: Happens to work without the OPUS_MOVE(), but only because the current encoder already copies x to y */
       if (x!=y)
          OPUS_MOVE(y, x, N);
       return;
    }
    g00 = MULT16_16_Q15(g0, gains[tapset0][0]);
    g01 = MULT16_16_Q15(g0, gains[tapset0][1]);
    g02 = MULT16_16_Q15(g0, gains[tapset0][2]);
    g10 = MULT16_16_Q15(g1, gains[tapset1][0]);
    g11 = MULT16_16_Q15(g1, gains[tapset1][1]);
    g12 = MULT16_16_Q15(g1, gains[tapset1][2]);
    x1 = x[-T1+1];
    x2 = x[-T1  ];
    x3 = x[-T1-1];
    x4 = x[-T1-2];
    for (i=0;i<overlap;i++)
    {
       opus_val16 f;
       x0=x[i-T1+2];
       f = MULT16_16_Q15(window[i],window[i]);
       y[i] = x[i]
                + MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g00),x[i-T0])
                + MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g01),ADD32(x[i-T0+1],x[i-T0-1]))
                + MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g02),ADD32(x[i-T0+2],x[i-T0-2]))
                + MULT16_32_Q15(MULT16_16_Q15(f,g10),x2)
                + MULT16_32_Q15(MULT16_16_Q15(f,g11),ADD32(x1,x3))
                + MULT16_32_Q15(MULT16_16_Q15(f,g12),ADD32(x0,x4));
       x4=x3;
       x3=x2;
       x2=x1;
       x1=x0;
    }
    if (g1==0)
    {
       /* OPT: Happens to work without the OPUS_MOVE(), but only because the current encoder already copies x to y */
       if (x!=y)
          OPUS_MOVE(y+overlap, x+overlap, N-overlap);
       return;
    }
    /* Compute the part with the constant filter. */
    comb_filter_const(y+i, x+i, T1, N-i, g10, g11, g12);
 }
 const signed char tf_select_table[4][8] = {
       {0, -1, 0, -1,    0,-1, 0,-1},
       {0, -1, 0, -2,    1, 0, 1,-1},
       {0, -2, 0, -3,    2, 0, 1,-1},
       {0, -2, 0, -3,    3, 0, 1,-1},
 };
 void init_caps(const CELTMode *m,int *cap,int LM,int C)
 {
    int i;
    for (i=0;i<m->nbEBands;i++)
    {
       int N;
       N=(m->eBands[i+1]-m->eBands[i])<<LM;
       cap[i] = (m->cache.caps[m->nbEBands*(2*LM+C-1)+i]+64)*C*N>>2;
    }
 }
 const char *opus_strerror(int error)
 {
    static const char * const error_strings[8] = {
       "success",
       "invalid argument",
       "buffer too small",
       "internal error",
       "corrupted stream",
       "request not implemented",
       "invalid state",
       "memory allocation failed"
    };
    if (error > 0 || error < -7)
       return "unknown error";
    else
       return error_strings[-error];
 }
 const char *opus_get_version_string(void)
 {
     return "libopus " PACKAGE_VERSION
 #ifdef FIXED_POINT
           "-fixed"
 #endif
 #ifdef FUZZING
           "-fuzzing"
 #endif
           ;
 }

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media/libopus/celt/celt.c@b8a032363ba2 (annotated)

media/libopus/celt/celt.c