Use proper license header.
[libav.git] / tests / tiny_psnr.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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 <stdio.h>
22 #include <stdlib.h>
23 #include <inttypes.h>
24 #include <assert.h>
25
26 #define F 100
27 #define SIZE 2048
28
29 uint64_t exp16_table[21]={
30 65537,
31 65538,
32 65540,
33 65544,
34 65552,
35 65568,
36 65600,
37 65664,
38 65793,
39 66050,
40 66568,
41 67616,
42 69763,
43 74262,
44 84150,
45 108051,
46 178145,
47 484249,
48 3578144,
49 195360063,
50 582360139072LL,
51 };
52 #if 1
53 // 16.16 fixpoint exp()
54 static unsigned int exp16(unsigned int a){
55 int i;
56 int out= 1<<16;
57
58 for(i=19;i>=0;i--){
59 if(a&(1<<i))
60 out= (out*exp16_table[i] + (1<<15))>>16;
61 }
62
63 return out;
64 }
65 // 16.16 fixpoint log()
66 static int64_t log16(uint64_t a){
67 int i;
68 int out=0;
69
70 if(a < 1<<16)
71 return -log16((1LL<<32) / a);
72 a<<=16;
73
74 for(i=20;i>=0;i--){
75 int64_t b= exp16_table[i];
76 if(a<(b<<16)) continue;
77 out |= 1<<i;
78 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
79 }
80 return out;
81 }
82
83 #endif
84 static uint64_t int_sqrt(uint64_t a)
85 {
86 uint64_t ret=0;
87 int s;
88 uint64_t ret_sq=0;
89
90 for(s=31; s>=0; s--){
91 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
92 if(b<=a){
93 ret_sq=b;
94 ret+= 1ULL<<s;
95 }
96 }
97 return ret;
98 }
99
100 int main(int argc,char* argv[]){
101 int i, j;
102 uint64_t sse=0;
103 uint64_t dev;
104 FILE *f[2];
105 uint8_t buf[2][SIZE];
106 uint64_t psnr;
107 int len= argc<4 ? 1 : atoi(argv[3]);
108 int64_t max= (1<<(8*len))-1;
109 int shift= argc<5 ? 0 : atoi(argv[4]);
110 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
111
112 if(argc<3){
113 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
114 printf("for wav files use the following:\n");
115 printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
116 return -1;
117 }
118
119 f[0]= fopen(argv[1], "rb");
120 f[1]= fopen(argv[2], "rb");
121 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
122
123 fseek(f[0],skip_bytes,SEEK_CUR);
124 fseek(f[1],skip_bytes,SEEK_CUR);
125
126 for(i=0;;){
127 if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
128 if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
129
130 for(j=0; j<SIZE; i++,j++){
131 int64_t a= buf[0][j];
132 int64_t b= buf[1][j];
133 if(len==2){
134 a= (int16_t)(a | (buf[0][++j]<<8));
135 b= (int16_t)(b | (buf[1][ j]<<8));
136 }
137 sse += (a-b) * (a-b);
138 }
139 }
140
141 if(!i) i=1;
142 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
143 if(sse)
144 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1<<31)) / (1LL<<32);
145 else
146 psnr= 100*F-1; //floating point free infinity :)
147
148 printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n",
149 (int)(dev/F), (int)(dev%F),
150 (int)(psnr/F), (int)(psnr%F),
151 i*len);
152 return 0;
153 }
154
155