FFmpeg
binkdsp.c
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1 /*
2  * Bink DSP routines
3  * Copyright (c) 2009 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Bink DSP routines
25  */
26 
27 #include "libavutil/attributes.h"
28 #include "binkdsp.h"
29 
30 #define A1 2896 /* (1/sqrt(2))<<12 */
31 #define A2 2217
32 #define A3 3784
33 #define A4 -5352
34 
35 #define MUL(X,Y) ((int)((unsigned)(X) * (Y)) >> 11)
36 
37 #define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\
38  const int a0 = (src)[s0] + (src)[s4]; \
39  const int a1 = (src)[s0] - (src)[s4]; \
40  const int a2 = (src)[s2] + (src)[s6]; \
41  const int a3 = MUL(A1, (src)[s2] - (src)[s6]); \
42  const int a4 = (src)[s5] + (src)[s3]; \
43  const int a5 = (src)[s5] - (src)[s3]; \
44  const int a6 = (src)[s1] + (src)[s7]; \
45  const int a7 = (src)[s1] - (src)[s7]; \
46  const int b0 = a4 + a6; \
47  const int b1 = MUL(A3, a5 + a7); \
48  const int b2 = MUL(A4, a5) - b0 + b1; \
49  const int b3 = MUL(A1, a6 - a4) - b2; \
50  const int b4 = MUL(A2, a7) + b3 - b1; \
51  (dest)[d0] = munge(a0+a2 +b0); \
52  (dest)[d1] = munge(a1+a3-a2+b2); \
53  (dest)[d2] = munge(a1-a3+a2+b3); \
54  (dest)[d3] = munge(a0-a2 -b4); \
55  (dest)[d4] = munge(a0-a2 +b4); \
56  (dest)[d5] = munge(a1-a3+a2-b3); \
57  (dest)[d6] = munge(a1+a3-a2-b2); \
58  (dest)[d7] = munge(a0+a2 -b0); \
59 }
60 /* end IDCT_TRANSFORM macro */
61 
62 #define MUNGE_NONE(x) (x)
63 #define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src)
64 
65 #define MUNGE_ROW(x) (((x) + 0x7F)>>8)
66 #define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_ROW,src)
67 
68 static inline void bink_idct_col(int *dest, const int32_t *src)
69 {
70  if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) {
71  dest[0] =
72  dest[8] =
73  dest[16] =
74  dest[24] =
75  dest[32] =
76  dest[40] =
77  dest[48] =
78  dest[56] = src[0];
79  } else {
80  IDCT_COL(dest, src);
81  }
82 }
83 
84 static void bink_idct_c(int32_t *block)
85 {
86  int i;
87  int temp[64];
88 
89  for (i = 0; i < 8; i++)
90  bink_idct_col(&temp[i], &block[i]);
91  for (i = 0; i < 8; i++) {
92  IDCT_ROW( (&block[8*i]), (&temp[8*i]) );
93  }
94 }
95 
96 static void bink_idct_add_c(uint8_t *dest, int linesize, int32_t *block)
97 {
98  int i, j;
99 
101  for (i = 0; i < 8; i++, dest += linesize, block += 8)
102  for (j = 0; j < 8; j++)
103  dest[j] += block[j];
104 }
105 
106 static void bink_idct_put_c(uint8_t *dest, int linesize, int32_t *block)
107 {
108  int i;
109  int temp[64];
110  for (i = 0; i < 8; i++)
111  bink_idct_col(&temp[i], &block[i]);
112  for (i = 0; i < 8; i++) {
113  IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) );
114  }
115 }
116 
117 static void scale_block_c(const uint8_t src[64]/*align 8*/, uint8_t *dst/*align 8*/, int linesize)
118 {
119  int i, j;
120  uint16_t *dst1 = (uint16_t *) dst;
121  uint16_t *dst2 = (uint16_t *)(dst + linesize);
122 
123  for (j = 0; j < 8; j++) {
124  for (i = 0; i < 8; i++) {
125  dst1[i] = dst2[i] = src[i] * 0x0101;
126  }
127  src += 8;
128  dst1 += linesize;
129  dst2 += linesize;
130  }
131 }
132 
133 static void add_pixels8_c(uint8_t *restrict pixels, int16_t *block,
134  int line_size)
135 {
136  int i;
137 
138  for (i = 0; i < 8; i++) {
139  pixels[0] += block[0];
140  pixels[1] += block[1];
141  pixels[2] += block[2];
142  pixels[3] += block[3];
143  pixels[4] += block[4];
144  pixels[5] += block[5];
145  pixels[6] += block[6];
146  pixels[7] += block[7];
147  pixels += line_size;
148  block += 8;
149  }
150 }
151 
153 {
154  c->idct_add = bink_idct_add_c;
155  c->idct_put = bink_idct_put_c;
156  c->scale_block = scale_block_c;
157  c->add_pixels8 = add_pixels8_c;
158 }
ff_binkdsp_init
av_cold void ff_binkdsp_init(BinkDSPContext *c)
Definition: binkdsp.c:152
IDCT_ROW
#define IDCT_ROW(dest, src)
Definition: binkdsp.c:66
scale_block_c
static void scale_block_c(const uint8_t src[64], uint8_t *dst, int linesize)
Definition: binkdsp.c:117
bink_idct_add_c
static void bink_idct_add_c(uint8_t *dest, int linesize, int32_t *block)
Definition: binkdsp.c:96
IDCT_COL
#define IDCT_COL(dest, src)
Definition: binkdsp.c:63
av_cold
#define av_cold
Definition: attributes.h:90
bink_idct_c
static void bink_idct_c(int32_t *block)
Definition: binkdsp.c:84
BinkDSPContext
Definition: binkdsp.h:32
add_pixels8_c
static void add_pixels8_c(uint8_t *restrict pixels, int16_t *block, int line_size)
Definition: binkdsp.c:133
bink_idct_put_c
static void bink_idct_put_c(uint8_t *dest, int linesize, int32_t *block)
Definition: binkdsp.c:106
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
bink_idct_col
static void bink_idct_col(int *dest, const int32_t *src)
Definition: binkdsp.c:68
attributes.h
binkdsp.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
temp
else temp
Definition: vf_mcdeint.c:263
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
int32_t
int32_t
Definition: audioconvert.c:56
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207