4xm: remove unneeded check for remaining unused data.
[libav.git] / tests / tiny_psnr.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; 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 // 16.16 fixpoint log()
56 static int64_t log16(uint64_t a){
57 int i;
58 int out=0;
59
60 if(a < 1<<16)
61 return -log16((1LL<<32) / a);
62 a<<=16;
63
64 for(i=20;i>=0;i--){
65 int64_t b= exp16_table[i];
66 if(a<(b<<16)) continue;
67 out |= 1<<i;
68 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
69 }
70 return out;
71 }
72
73 static uint64_t int_sqrt(uint64_t a)
74 {
75 uint64_t ret=0;
76 int s;
77 uint64_t ret_sq=0;
78
79 for(s=31; s>=0; s--){
80 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
81 if(b<=a){
82 ret_sq=b;
83 ret+= 1ULL<<s;
84 }
85 }
86 return ret;
87 }
88
89 int main(int argc,char* argv[]){
90 int i, j;
91 uint64_t sse=0;
92 uint64_t dev;
93 FILE *f[2];
94 uint8_t buf[2][SIZE];
95 uint64_t psnr;
96 int len= argc<4 ? 1 : atoi(argv[3]);
97 int64_t max= (1<<(8*len))-1;
98 int shift= argc<5 ? 0 : atoi(argv[4]);
99 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
100 int size0=0;
101 int size1=0;
102 int maxdist = 0;
103
104 if(argc<3){
105 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
106 printf("WAV headers are skipped automatically.\n");
107 return 1;
108 }
109
110 f[0]= fopen(argv[1], "rb");
111 f[1]= fopen(argv[2], "rb");
112 if(!f[0] || !f[1]){
113 fprintf(stderr, "Could not open input files.\n");
114 return 1;
115 }
116
117 for (i = 0; i < 2; i++) {
118 uint8_t *p = buf[i];
119 if (fread(p, 1, 12, f[i]) != 12)
120 return 1;
121 if (!memcmp(p, "RIFF", 4) &&
122 !memcmp(p+8, "WAVE", 4)) {
123 if (fread(p, 1, 8, f[i]) != 8)
124 return 1;
125 while (memcmp(p, "data", 4)) {
126 int s = p[4] | p[5]<<8 | p[6]<<16 | p[7]<<24;
127 fseek(f[i], s, SEEK_CUR);
128 if (fread(p, 1, 8, f[i]) != 8)
129 return 1;
130 }
131 } else {
132 fseek(f[i], -12, SEEK_CUR);
133 }
134 }
135
136 fseek(f[shift<0], abs(shift), SEEK_CUR);
137
138 fseek(f[0],skip_bytes,SEEK_CUR);
139 fseek(f[1],skip_bytes,SEEK_CUR);
140
141 for(;;){
142 int s0= fread(buf[0], 1, SIZE, f[0]);
143 int s1= fread(buf[1], 1, SIZE, f[1]);
144
145 for(j=0; j<FFMIN(s0,s1); j++){
146 int64_t a= buf[0][j];
147 int64_t b= buf[1][j];
148 int dist;
149 if(len==2){
150 a= (int16_t)(a | (buf[0][++j]<<8));
151 b= (int16_t)(b | (buf[1][ j]<<8));
152 }
153 sse += (a-b) * (a-b);
154 dist = abs(a-b);
155 if (dist > maxdist) maxdist = dist;
156 }
157 size0 += s0;
158 size1 += s1;
159 if(s0+s1<=0)
160 break;
161 }
162
163 i= FFMIN(size0,size1)/len;
164 if(!i) i=1;
165 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
166 if(sse)
167 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
168 else
169 psnr= 1000*F-1; //floating point free infinity :)
170
171 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
172 (int)(dev/F), (int)(dev%F),
173 (int)(psnr/F), (int)(psnr%F),
174 maxdist,
175 size0, size1);
176 return 0;
177 }
178
179