COSMETICS: Remove all trailing whitespace.
[libav.git] / tests / tiny_psnr.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <inttypes.h>
23 #include <assert.h>
24
25 #define F 100
26 #define SIZE 2048
27
28 uint64_t exp16_table[21]={
29 65537,
30 65538,
31 65540,
32 65544,
33 65552,
34 65568,
35 65600,
36 65664,
37 65793,
38 66050,
39 66568,
40 67616,
41 69763,
42 74262,
43 84150,
44 108051,
45 178145,
46 484249,
47 3578144,
48 195360063,
49 582360139072LL,
50 };
51 #if 1
52 // 16.16 fixpoint exp()
53 static unsigned int exp16(unsigned int a){
54 int i;
55 int out= 1<<16;
56
57 for(i=19;i>=0;i--){
58 if(a&(1<<i))
59 out= (out*exp16_table[i] + (1<<15))>>16;
60 }
61
62 return out;
63 }
64 // 16.16 fixpoint log()
65 static int64_t log16(uint64_t a){
66 int i;
67 int out=0;
68
69 if(a < 1<<16)
70 return -log16((1LL<<32) / a);
71 a<<=16;
72
73 for(i=20;i>=0;i--){
74 int64_t b= exp16_table[i];
75 if(a<(b<<16)) continue;
76 out |= 1<<i;
77 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
78 }
79 return out;
80 }
81
82 #endif
83 static uint64_t int_sqrt(uint64_t a)
84 {
85 uint64_t ret=0;
86 int s;
87 uint64_t ret_sq=0;
88
89 for(s=31; s>=0; s--){
90 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
91 if(b<=a){
92 ret_sq=b;
93 ret+= 1ULL<<s;
94 }
95 }
96 return ret;
97 }
98
99 int main(int argc,char* argv[]){
100 int i, j;
101 uint64_t sse=0;
102 uint64_t dev;
103 FILE *f[2];
104 uint8_t buf[2][SIZE];
105 uint64_t psnr;
106 int len= argc<4 ? 1 : atoi(argv[3]);
107 int64_t max= (1<<(8*len))-1;
108 int shift= argc<5 ? 0 : atoi(argv[4]);
109
110 if(argc<3){
111 printf("tiny_psnr <file1> <file2> [<elem size> [<shift>]]\n");
112 return -1;
113 }
114
115 f[0]= fopen(argv[1], "rb");
116 f[1]= fopen(argv[2], "rb");
117 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
118
119 for(i=0;;){
120 if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
121 if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
122
123 for(j=0; j<SIZE; i++,j++){
124 int64_t a= buf[0][j];
125 int64_t b= buf[1][j];
126 if(len==2){
127 a= (int16_t)(a | (buf[0][++j]<<8));
128 b= (int16_t)(b | (buf[1][ j]<<8));
129 }
130 sse += (a-b) * (a-b);
131 }
132 }
133
134 if(!i) i=1;
135 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
136 if(sse)
137 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1<<31)) / (1LL<<32);
138 else
139 psnr= 100*F-1; //floating point free infinity :)
140
141 printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n",
142 (int)(dev/F), (int)(dev%F),
143 (int)(psnr/F), (int)(psnr%F),
144 i);
145 return 0;
146 }
147
148