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hqxdsp.c
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1 /*
2  * HQX DSP routines
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdint.h>
22 
23 #include "libavutil/common.h"
24 
25 #include "hqxdsp.h"
26 
27 static inline void idct_col(int16_t *blk, const uint8_t *quant)
28 {
29  int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF;
30  int t10, t11, t12, t13;
31  int s0, s1, s2, s3, s4, s5, s6, s7;
32 
33  s0 = (int) blk[0 * 8] * quant[0 * 8];
34  s1 = (int) blk[1 * 8] * quant[1 * 8];
35  s2 = (int) blk[2 * 8] * quant[2 * 8];
36  s3 = (int) blk[3 * 8] * quant[3 * 8];
37  s4 = (int) blk[4 * 8] * quant[4 * 8];
38  s5 = (int) blk[5 * 8] * quant[5 * 8];
39  s6 = (int) blk[6 * 8] * quant[6 * 8];
40  s7 = (int) blk[7 * 8] * quant[7 * 8];
41 
42  t0 = (s3 * 19266 + s5 * 12873) >> 15;
43  t1 = (s5 * 19266 - s3 * 12873) >> 15;
44  t2 = ((s7 * 4520 + s1 * 22725) >> 15) - t0;
45  t3 = ((s1 * 4520 - s7 * 22725) >> 15) - t1;
46  t4 = t0 * 2 + t2;
47  t5 = t1 * 2 + t3;
48  t6 = t2 - t3;
49  t7 = t3 * 2 + t6;
50  t8 = (t6 * 11585) >> 14;
51  t9 = (t7 * 11585) >> 14;
52  tA = (s2 * 8867 - s6 * 21407) >> 14;
53  tB = (s6 * 8867 + s2 * 21407) >> 14;
54  tC = (s0 >> 1) - (s4 >> 1);
55  tD = (s4 >> 1) * 2 + tC;
56  tE = tC - (tA >> 1);
57  tF = tD - (tB >> 1);
58  t10 = tF - t5;
59  t11 = tE - t8;
60  t12 = tE + (tA >> 1) * 2 - t9;
61  t13 = tF + (tB >> 1) * 2 - t4;
62 
63  blk[0 * 8] = t13 + t4 * 2;
64  blk[1 * 8] = t12 + t9 * 2;
65  blk[2 * 8] = t11 + t8 * 2;
66  blk[3 * 8] = t10 + t5 * 2;
67  blk[4 * 8] = t10;
68  blk[5 * 8] = t11;
69  blk[6 * 8] = t12;
70  blk[7 * 8] = t13;
71 }
72 
73 static inline void idct_row(int16_t *blk)
74 {
75  int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF;
76  int t10, t11, t12, t13;
77 
78  t0 = (blk[3] * 19266 + blk[5] * 12873) >> 14;
79  t1 = (blk[5] * 19266 - blk[3] * 12873) >> 14;
80  t2 = ((blk[7] * 4520 + blk[1] * 22725) >> 14) - t0;
81  t3 = ((blk[1] * 4520 - blk[7] * 22725) >> 14) - t1;
82  t4 = t0 * 2 + t2;
83  t5 = t1 * 2 + t3;
84  t6 = t2 - t3;
85  t7 = t3 * 2 + t6;
86  t8 = (t6 * 11585) >> 14;
87  t9 = (t7 * 11585) >> 14;
88  tA = (blk[2] * 8867 - blk[6] * 21407) >> 14;
89  tB = (blk[6] * 8867 + blk[2] * 21407) >> 14;
90  tC = blk[0] - blk[4];
91  tD = blk[4] * 2 + tC;
92  tE = tC - tA;
93  tF = tD - tB;
94  t10 = tF - t5;
95  t11 = tE - t8;
96  t12 = tE + tA * 2 - t9;
97  t13 = tF + tB * 2 - t4;
98 
99  blk[0] = (t13 + t4 * 2 + 4) >> 3;
100  blk[1] = (t12 + t9 * 2 + 4) >> 3;
101  blk[2] = (t11 + t8 * 2 + 4) >> 3;
102  blk[3] = (t10 + t5 * 2 + 4) >> 3;
103  blk[4] = (t10 + 4) >> 3;
104  blk[5] = (t11 + 4) >> 3;
105  blk[6] = (t12 + 4) >> 3;
106  blk[7] = (t13 + 4) >> 3;
107 }
108 
109 static void hqx_idct_put(uint16_t *dst, ptrdiff_t stride,
110  int16_t *block, const uint8_t *quant)
111 {
112  int i, j;
113 
114  for (i = 0; i < 8; i++)
115  idct_col(block + i, quant + i);
116  for (i = 0; i < 8; i++)
117  idct_row(block + i * 8);
118 
119  for (i = 0; i < 8; i++) {
120  for (j = 0; j < 8; j++) {
121  int v = av_clip_uintp2(block[j + i * 8] + 0x800, 12);
122  dst[j] = (v << 4) | (v >> 8);
123  }
124  dst += stride >> 1;
125  }
126 }
127 
129 {
130  c->idct_put = hqx_idct_put;
131 }
#define t9
Definition: regdef.h:54
#define t8
Definition: regdef.h:53
void(* idct_put)(uint16_t *dst, ptrdiff_t stride, int16_t *block, const uint8_t *quant)
Definition: hqxdsp.h:33
#define blk(i)
Definition: sha.c:185
#define t7
Definition: regdef.h:35
#define t12
Definition: regdef.h:58
uint8_t
#define av_cold
Definition: attributes.h:82
static void hqx_idct_put(uint16_t *dst, ptrdiff_t stride, int16_t *block, const uint8_t *quant)
Definition: hqxdsp.c:109
#define t11
Definition: regdef.h:56
#define t0
Definition: regdef.h:28
static void idct_row(int16_t *blk)
Definition: hqxdsp.c:73
#define s2
Definition: regdef.h:39
#define t10
Definition: regdef.h:55
#define s0
Definition: regdef.h:37
#define t1
Definition: regdef.h:29
#define t3
Definition: regdef.h:31
#define s5
Definition: regdef.h:42
HQX DSP routines.
#define s4
Definition: regdef.h:41
static void idct_col(int16_t *blk, const uint8_t *quant)
Definition: hqxdsp.c:27
#define s3
Definition: regdef.h:40
#define t5
Definition: regdef.h:33
#define s1
Definition: regdef.h:38
const uint8_t * quant
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
common internal and external API header
#define t6
Definition: regdef.h:34
static double c[64]
av_cold void ff_hqxdsp_init(HQXDSPContext *c)
Definition: hqxdsp.c:128
#define t4
Definition: regdef.h:32
#define s6
Definition: regdef.h:43
#define t2
Definition: regdef.h:30
static int16_t block[64]
Definition: dct-test.c:112