vp8/decoder/dequantize.c

   1 /*
   2  *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license and patent
   5  *  grant that can be found in the LICENSE file in the root of the source
   6  *  tree. All contributing project authors may be found in the AUTHORS
   7  *  file in the root of the source tree.
   8  */
   9
  10
  11 #include "vpx_ports/config.h"
  12 #include "dequantize.h"
  13 #include "predictdc.h"
  14 #include "idct.h"
  15 #include "vpx_mem/vpx_mem.h"
  16
  17 extern void vp8_short_idct4x4llm_c(short *input, short *output, int pitch) ;
  18 extern void vp8_short_idct4x4llm_1_c(short *input, short *output, int pitch);
  19
  20
  21 void vp8_dequantize_b_c(BLOCKD *d)
  22 {
  23     int i;
  24     short *DQ  = d->dqcoeff;
  25     short *Q   = d->qcoeff;
  26     short *DQC = &d->dequant[0][0];
  27
  28     for (i = 0; i < 16; i++)
  29     {
  30         DQ[i] = Q[i] * DQC[i];
  31     }
  32 }
  33
  34 void vp8_dequant_idct_c(short *input, short *dq, short *output, int pitch)
  35 {
  36     int i;
  37
  38     for (i = 0; i < 16; i++)
  39     {
  40         input[i] = dq[i] * input[i];
  41     }
  42
  43     vp8_short_idct4x4llm_c(input, output, pitch);
  44     vpx_memset(input, 0, 32);
  45 }
  46
  47 void vp8_dequant_dc_idct_c(short *input, short *dq, short *output, int pitch, int Dc)
  48 {
  49     int i;
  50
  51     input[0] = (short)Dc;
  52
  53     for (i = 1; i < 16; i++)
  54     {
  55         input[i] = dq[i] * input[i];
  56     }
  57
  58     vp8_short_idct4x4llm_c(input, output, pitch);
  59     vpx_memset(input, 0, 32);
  60 }