66b6747af340cf1e019affe9435ddf6e8dba3422
[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 FFMIN(a,b) ((a) > (b) ? (b) : (a))
27 #define F 100
28 #define SIZE 2048
29
30 uint64_t exp16_table[21]={
31 65537,
32 65538,
33 65540,
34 65544,
35 65552,
36 65568,
37 65600,
38 65664,
39 65793,
40 66050,
41 66568,
42 67616,
43 69763,
44 74262,
45 84150,
46 108051,
47 178145,
48 484249,
49 3578144,
50 195360063,
51 582360139072LL,
52 };
53
54 #if 0
55 // 16.16 fixpoint exp()
56 static unsigned int exp16(unsigned int a){
57 int i;
58 int out= 1<<16;
59
60 for(i=19;i>=0;i--){
61 if(a&(1<<i))
62 out= (out*exp16_table[i] + (1<<15))>>16;
63 }
64
65 return out;
66 }
67 #endif
68
69 // 16.16 fixpoint log()
70 static int64_t log16(uint64_t a){
71 int i;
72 int out=0;
73
74 if(a < 1<<16)
75 return -log16((1LL<<32) / a);
76 a<<=16;
77
78 for(i=20;i>=0;i--){
79 int64_t b= exp16_table[i];
80 if(a<(b<<16)) continue;
81 out |= 1<<i;
82 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
83 }
84 return out;
85 }
86
87 static uint64_t int_sqrt(uint64_t a)
88 {
89 uint64_t ret=0;
90 int s;
91 uint64_t ret_sq=0;
92
93 for(s=31; s>=0; s--){
94 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
95 if(b<=a){
96 ret_sq=b;
97 ret+= 1ULL<<s;
98 }
99 }
100 return ret;
101 }
102
103 int main(int argc,char* argv[]){
104 int i, j;
105 uint64_t sse=0;
106 uint64_t dev;
107 FILE *f[2];
108 uint8_t buf[2][SIZE];
109 uint64_t psnr;
110 int len= argc<4 ? 1 : atoi(argv[3]);
111 int64_t max= (1<<(8*len))-1;
112 int shift= argc<5 ? 0 : atoi(argv[4]);
113 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
114 int size0=0;
115 int size1=0;
116 int maxdist = 0;
117
118 if(argc<3){
119 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
120 printf("For WAV files use the following:\n");
121 printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
122 return -1;
123 }
124
125 f[0]= fopen(argv[1], "rb");
126 f[1]= fopen(argv[2], "rb");
127 if(!f[0] || !f[1]){
128 fprintf(stderr, "Could not open input files.\n");
129 return -1;
130 }
131 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
132
133 fseek(f[0],skip_bytes,SEEK_CUR);
134 fseek(f[1],skip_bytes,SEEK_CUR);
135
136 for(;;){
137 int s0= fread(buf[0], 1, SIZE, f[0]);
138 int s1= fread(buf[1], 1, SIZE, f[1]);
139
140 for(j=0; j<FFMIN(s0,s1); j++){
141 int64_t a= buf[0][j];
142 int64_t b= buf[1][j];
143 int dist;
144 if(len==2){
145 a= (int16_t)(a | (buf[0][++j]<<8));
146 b= (int16_t)(b | (buf[1][ j]<<8));
147 }
148 sse += (a-b) * (a-b);
149 dist = abs(a-b);
150 if (dist > maxdist) maxdist = dist;
151 }
152 size0 += s0;
153 size1 += s1;
154 if(s0+s1<=0)
155 break;
156 }
157
158 i= FFMIN(size0,size1)/len;
159 if(!i) i=1;
160 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
161 if(sse)
162 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
163 else
164 psnr= 1000*F-1; //floating point free infinity :)
165
166 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
167 (int)(dev/F), (int)(dev%F),
168 (int)(psnr/F), (int)(psnr%F),
169 maxdist,
170 size0, size1);
171 return 0;
172 }
173
174