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 "vpx_ports/config.h"
13 #include "dequantize.h"
14 #include "vp8/common/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
vp8_dequantize_b_c(BLOCKD * d)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;
27
28 for (i = 0; i < 16; i++)
29 {
30 DQ[i] = Q[i] * DQC[i];
31 }
32 }
33
vp8_dequant_idct_add_c(short * input,short * dq,unsigned char * pred,unsigned char * dest,int pitch,int stride)34 void vp8_dequant_idct_add_c(short *input, short *dq, unsigned char *pred,
35 unsigned char *dest, int pitch, int stride)
36 {
37 short output[16];
38 short *diff_ptr = output;
39 int r, c;
40 int i;
41
42 for (i = 0; i < 16; i++)
43 {
44 input[i] = dq[i] * input[i];
45 }
46
47 /* the idct halves ( >> 1) the pitch */
48 vp8_short_idct4x4llm_c(input, output, 4 << 1);
49
50 vpx_memset(input, 0, 32);
51
52 for (r = 0; r < 4; r++)
53 {
54 for (c = 0; c < 4; c++)
55 {
56 int a = diff_ptr[c] + pred[c];
57
58 if (a < 0)
59 a = 0;
60
61 if (a > 255)
62 a = 255;
63
64 dest[c] = (unsigned char) a;
65 }
66
67 dest += stride;
68 diff_ptr += 4;
69 pred += pitch;
70 }
71 }
72
vp8_dequant_dc_idct_add_c(short * input,short * dq,unsigned char * pred,unsigned char * dest,int pitch,int stride,int Dc)73 void vp8_dequant_dc_idct_add_c(short *input, short *dq, unsigned char *pred,
74 unsigned char *dest, int pitch, int stride,
75 int Dc)
76 {
77 int i;
78 short output[16];
79 short *diff_ptr = output;
80 int r, c;
81
82 input[0] = (short)Dc;
83
84 for (i = 1; i < 16; i++)
85 {
86 input[i] = dq[i] * input[i];
87 }
88
89 /* the idct halves ( >> 1) the pitch */
90 vp8_short_idct4x4llm_c(input, output, 4 << 1);
91
92 vpx_memset(input, 0, 32);
93
94 for (r = 0; r < 4; r++)
95 {
96 for (c = 0; c < 4; c++)
97 {
98 int a = diff_ptr[c] + pred[c];
99
100 if (a < 0)
101 a = 0;
102
103 if (a > 255)
104 a = 255;
105
106 dest[c] = (unsigned char) a;
107 }
108
109 dest += stride;
110 diff_ptr += 4;
111 pred += pitch;
112 }
113 }
114