1 /******************************************************************************
2 *
3 * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18 /**
19 *******************************************************************************
20 * @file
21 * ihevc_chroma_itrans_recon.c
22 *
23 * @brief
24 * Contains function definitions for inverse transform and reconstruction
25 * of chroma interleaved data.
26 *
27 * @author
28 * 100470
29 *
30 * @par List of Functions:
31 * - ihevc_chroma_itrans_recon_4x4()
32 *
33 * @remarks
34 * None
35 *
36 *******************************************************************************
37 */
38
39 #include <stdio.h>
40 #include <string.h>
41 #include "ihevc_typedefs.h"
42 #include "ihevc_macros.h"
43 #include "ihevc_platform_macros.h"
44 #include "ihevc_defs.h"
45 #include "ihevc_trans_tables.h"
46 #include "ihevc_chroma_itrans_recon.h"
47 #include "ihevc_func_selector.h"
48 #include "ihevc_trans_macros.h"
49
50 /* All the functions work one component(U or V) of interleaved data depending upon pointers passed to it */
51 /* Data visualization */
52 /* U V U V U V U V */
53 /* U V U V U V U V */
54 /* U V U V U V U V */
55 /* U V U V U V U V */
56 /* If the pointer points to first byte of above stream (U) , functions will operate on U component */
57 /* If the pointer points to second byte of above stream (V) , functions will operate on V component */
58
59 /**
60 *******************************************************************************
61 *
62 * @brief
63 * This function performs Inverse transform and reconstruction for 4x4
64 * input block
65 *
66 * @par Description:
67 * Performs inverse transform and adds the prediction data and clips output
68 * to 8 bit
69 *
70 * @param[in] pi2_src
71 * Input 4x4 coefficients
72 *
73 * @param[in] pi2_tmp
74 * Temporary 4x4 buffer for storing inverse transform
75 * 1st stage output
76 *
77 * @param[in] pu1_pred
78 * Prediction 4x4 block
79 *
80 * @param[out] pu1_dst
81 * Output 4x4 block
82 *
83 * @param[in] src_strd
84 * Input stride
85 *
86 * @param[in] pred_strd
87 * Prediction stride
88 *
89 * @param[in] dst_strd
90 * Output Stride
91 *
92 * @param[in] shift
93 * Output shift
94 *
95 * @param[in] zero_cols
96 * Zero columns in pi2_src
97 *
98 * @returns Void
99 *
100 * @remarks
101 * None
102 *
103 *******************************************************************************
104 */
105
106
ihevc_chroma_itrans_recon_4x4(WORD16 * pi2_src,WORD16 * pi2_tmp,UWORD8 * pu1_pred,UWORD8 * pu1_dst,WORD32 src_strd,WORD32 pred_strd,WORD32 dst_strd,WORD32 zero_cols,WORD32 zero_rows)107 void ihevc_chroma_itrans_recon_4x4(WORD16 *pi2_src,
108 WORD16 *pi2_tmp,
109 UWORD8 *pu1_pred,
110 UWORD8 *pu1_dst,
111 WORD32 src_strd,
112 WORD32 pred_strd,
113 WORD32 dst_strd,
114 WORD32 zero_cols,
115 WORD32 zero_rows)
116 {
117 WORD32 j;
118 WORD32 e[2], o[2];
119 WORD32 add;
120 WORD32 shift;
121 WORD16 *pi2_tmp_orig;
122 WORD32 trans_size;
123 UNUSED(zero_rows);
124 trans_size = TRANS_SIZE_4;
125
126 pi2_tmp_orig = pi2_tmp;
127
128 /* Inverse Transform 1st stage */
129 shift = IT_SHIFT_STAGE_1;
130 add = 1 << (shift - 1);
131
132 for(j = 0; j < trans_size; j++)
133 {
134 /* Checking for Zero Cols */
135 if((zero_cols & 1) == 1)
136 {
137 memset(pi2_tmp, 0, trans_size * sizeof(WORD16));
138 }
139 else
140 {
141
142 /* Utilizing symmetry properties to the maximum to minimize the number of multiplications */
143 o[0] = g_ai2_ihevc_trans_4[1][0] * pi2_src[src_strd]
144 + g_ai2_ihevc_trans_4[3][0] * pi2_src[3 * src_strd];
145 o[1] = g_ai2_ihevc_trans_4[1][1] * pi2_src[src_strd]
146 + g_ai2_ihevc_trans_4[3][1] * pi2_src[3 * src_strd];
147 e[0] = g_ai2_ihevc_trans_4[0][0] * pi2_src[0]
148 + g_ai2_ihevc_trans_4[2][0] * pi2_src[2 * src_strd];
149 e[1] = g_ai2_ihevc_trans_4[0][1] * pi2_src[0]
150 + g_ai2_ihevc_trans_4[2][1] * pi2_src[2 * src_strd];
151
152 pi2_tmp[0] =
153 CLIP_S16(((e[0] + o[0] + add) >> shift));
154 pi2_tmp[1] =
155 CLIP_S16(((e[1] + o[1] + add) >> shift));
156 pi2_tmp[2] =
157 CLIP_S16(((e[1] - o[1] + add) >> shift));
158 pi2_tmp[3] =
159 CLIP_S16(((e[0] - o[0] + add) >> shift));
160
161 }
162 pi2_src++;
163 pi2_tmp += trans_size;
164 zero_cols = zero_cols >> 1;
165 }
166
167 pi2_tmp = pi2_tmp_orig;
168
169 /* Inverse Transform 2nd stage */
170 shift = IT_SHIFT_STAGE_2;
171 add = 1 << (shift - 1);
172
173 for(j = 0; j < trans_size; j++)
174 {
175 WORD32 itrans_out;
176 /* Utilizing symmetry properties to the maximum to minimize the number of multiplications */
177 o[0] = g_ai2_ihevc_trans_4[1][0] * pi2_tmp[trans_size]
178 + g_ai2_ihevc_trans_4[3][0] * pi2_tmp[3 * trans_size];
179 o[1] = g_ai2_ihevc_trans_4[1][1] * pi2_tmp[trans_size]
180 + g_ai2_ihevc_trans_4[3][1] * pi2_tmp[3 * trans_size];
181 e[0] = g_ai2_ihevc_trans_4[0][0] * pi2_tmp[0]
182 + g_ai2_ihevc_trans_4[2][0] * pi2_tmp[2 * trans_size];
183 e[1] = g_ai2_ihevc_trans_4[0][1] * pi2_tmp[0]
184 + g_ai2_ihevc_trans_4[2][1] * pi2_tmp[2 * trans_size];
185
186 itrans_out =
187 CLIP_S16(((e[0] + o[0] + add) >> shift));
188 pu1_dst[0 * 2] = CLIP_U8((itrans_out + pu1_pred[0 * 2]));
189 itrans_out =
190 CLIP_S16(((e[1] + o[1] + add) >> shift));
191 pu1_dst[1 * 2] = CLIP_U8((itrans_out + pu1_pred[1 * 2]));
192 itrans_out =
193 CLIP_S16(((e[1] - o[1] + add) >> shift));
194 pu1_dst[2 * 2] = CLIP_U8((itrans_out + pu1_pred[2 * 2]));
195 itrans_out =
196 CLIP_S16(((e[0] - o[0] + add) >> shift));
197 pu1_dst[3 * 2] = CLIP_U8((itrans_out + pu1_pred[3 * 2]));
198
199 pi2_tmp++;
200 pu1_pred += pred_strd;
201 pu1_dst += dst_strd;
202
203 }
204 }
205
206