vp8/encoder/arm/quantize_arm.c

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #include <math.h>
  13 #include "vpx_mem/vpx_mem.h"
  14
  15 #include "quantize.h"
  16 #include "entropy.h"
  17 #include "predictdc.h"
  18
  19 DECLARE_ALIGNED(16, const short, vp8_rvsplus1_default_zig_zag1d[16]) =
  20 {
  21     1,  2,  6,  7,
  22     3,  5,  8,  13,
  23     4,  9,  12, 14,
  24     10, 11, 15, 16,
  25 };
  26
  27
  28 extern int vp8_fast_quantize_b_neon_func(short *coeff_ptr, short *zbin_ptr, short *qcoeff_ptr, short *dqcoeff_ptr, short *dequant_ptr, const short *scan_mask, short *round_ptr, short *quant_ptr);
  29
  30 void vp8_fast_quantize_b_neon(BLOCK *b, BLOCKD *d)
  31 {
  32     d->eob = vp8_fast_quantize_b_neon_func(b->coeff, b->zbin, d->qcoeff, d->dqcoeff, d->dequant, vp8_rvsplus1_default_zig_zag1d, b->round, b->quant);
  33 }
  34
  35 /*
  36 //neon code is written according to the following rewritten c code
  37 void vp8_fast_quantize_b_neon(BLOCK *b,BLOCKD *d)
  38 {
  39     int i, rc, eob;
  40     int zbin;
  41     int x, x1, y, z, sz;
  42     short *coeff_ptr  = &b->Coeff[0];
  43     short *zbin_ptr   = &b->Zbin[0][0];
  44     short *round_ptr  = &b->Round[0][0];
  45     short *quant_ptr  = &b->Quant[0][0];
  46     short *qcoeff_ptr = d->qcoeff;
  47     short *dqcoeff_ptr= d->dqcoeff;
  48     short *dequant_ptr= &d->Dequant[0][0];
  49
  50     eob = 0;
  51
  52     for(i=0;i<16;i++)
  53     {
  54         z    = coeff_ptr[i];
  55         zbin = zbin_ptr[i] ;
  56         x  = abs(z);                                    // x = abs(z)
  57
  58         if(x>=zbin)
  59         {
  60             sz = (z>>31);                               // sign of z
  61             y  = ((x+round_ptr[i])*quant_ptr[i])>>16;     // quantize (x)
  62             x1  = (y^sz) - sz;                          // get the sign back
  63
  64             qcoeff_ptr[i] = x1;                          // write to destination
  65             dqcoeff_ptr[i] = x1 * dequant_ptr[i];         // dequantized value
  66
  67             if(y)
  68             {
  69                 if(eob<vp8_rvsplus1_default_zig_zag1d[i])
  70                     eob=(int)vp8_rvsplus1_default_zig_zag1d[i];         // last nonzero coeffs
  71             }
  72         }else
  73         {
  74             qcoeff_ptr[i] = 0;                          // write to destination
  75             dqcoeff_ptr[i] = 0;         // dequantized value
  76         }
  77     }
  78         d->eob = eob;
  79 }
  80 */