4a8ba42ad740ed4db8f9f0e78f32d63f6546cd33
[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 <string.h>
24 #include <inttypes.h>
25 #include <assert.h>
26
27 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
28 #define F 100
29 #define SIZE 2048
30
31 uint64_t exp16_table[21]={
32 65537,
33 65538,
34 65540,
35 65544,
36 65552,
37 65568,
38 65600,
39 65664,
40 65793,
41 66050,
42 66568,
43 67616,
44 69763,
45 74262,
46 84150,
47 108051,
48 178145,
49 484249,
50 3578144,
51 195360063,
52 582360139072LL,
53 };
54
55 #if 0
56 // 16.16 fixpoint exp()
57 static unsigned int exp16(unsigned int a){
58 int i;
59 int out= 1<<16;
60
61 for(i=19;i>=0;i--){
62 if(a&(1<<i))
63 out= (out*exp16_table[i] + (1<<15))>>16;
64 }
65
66 return out;
67 }
68 #endif
69
70 // 16.16 fixpoint log()
71 static int64_t log16(uint64_t a){
72 int i;
73 int out=0;
74
75 if(a < 1<<16)
76 return -log16((1LL<<32) / a);
77 a<<=16;
78
79 for(i=20;i>=0;i--){
80 int64_t b= exp16_table[i];
81 if(a<(b<<16)) continue;
82 out |= 1<<i;
83 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
84 }
85 return out;
86 }
87
88 static uint64_t int_sqrt(uint64_t a)
89 {
90 uint64_t ret=0;
91 int s;
92 uint64_t ret_sq=0;
93
94 for(s=31; s>=0; s--){
95 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
96 if(b<=a){
97 ret_sq=b;
98 ret+= 1ULL<<s;
99 }
100 }
101 return ret;
102 }
103
104 int main(int argc,char* argv[]){
105 int i, j;
106 uint64_t sse=0;
107 uint64_t dev;
108 FILE *f[2];
109 uint8_t buf[2][SIZE];
110 uint64_t psnr;
111 int len= argc<4 ? 1 : atoi(argv[3]);
112 int64_t max= (1<<(8*len))-1;
113 int shift= argc<5 ? 0 : atoi(argv[4]);
114 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
115 int size0=0;
116 int size1=0;
117 int maxdist = 0;
118
119 if(argc<3){
120 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
121 printf("WAV headers are skipped automatically.\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
132 for (i = 0; i < 2; i++) {
133 uint8_t *p = buf[i];
134 fread(p, 1, 12, f[i]);
135 if (!memcmp(p, "RIFF", 4) &&
136 !memcmp(p+8, "WAVE", 4)) {
137 fread(p, 1, 8, f[i]);
138 while (memcmp(p, "data", 4)) {
139 int s = p[4] | p[5]<<8 | p[6]<<16 | p[7]<<24;
140 fseek(f[i], s, SEEK_CUR);
141 fread(p, 1, 8, f[i]);
142 }
143 } else {
144 fseek(f[i], -12, SEEK_CUR);
145 }
146 }
147
148 fseek(f[shift<0], abs(shift), SEEK_CUR);
149
150 fseek(f[0],skip_bytes,SEEK_CUR);
151 fseek(f[1],skip_bytes,SEEK_CUR);
152
153 for(;;){
154 int s0= fread(buf[0], 1, SIZE, f[0]);
155 int s1= fread(buf[1], 1, SIZE, f[1]);
156
157 for(j=0; j<FFMIN(s0,s1); j++){
158 int64_t a= buf[0][j];
159 int64_t b= buf[1][j];
160 int dist;
161 if(len==2){
162 a= (int16_t)(a | (buf[0][++j]<<8));
163 b= (int16_t)(b | (buf[1][ j]<<8));
164 }
165 sse += (a-b) * (a-b);
166 dist = abs(a-b);
167 if (dist > maxdist) maxdist = dist;
168 }
169 size0 += s0;
170 size1 += s1;
171 if(s0+s1<=0)
172 break;
173 }
174
175 i= FFMIN(size0,size1)/len;
176 if(!i) i=1;
177 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
178 if(sse)
179 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
180 else
181 psnr= 1000*F-1; //floating point free infinity :)
182
183 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
184 (int)(dev/F), (int)(dev%F),
185 (int)(psnr/F), (int)(psnr%F),
186 maxdist,
187 size0, size1);
188 return 0;
189 }
190
191