tiny_psnr: fix range calculation for sample size of 32 bits
[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 #include "libavutil/intfloat.h"
28
29 #define FFMIN(a, b) ((a) > (b) ? (b) : (a))
30 #define F 100
31 #define SIZE 2048
32
33 uint64_t exp16_table[21] = {
34 65537,
35 65538,
36 65540,
37 65544,
38 65552,
39 65568,
40 65600,
41 65664,
42 65793,
43 66050,
44 66568,
45 67616,
46 69763,
47 74262,
48 84150,
49 108051,
50 178145,
51 484249,
52 3578144,
53 195360063,
54 582360139072LL,
55 };
56
57 // 16.16 fixpoint log()
58 static int64_t log16(uint64_t a)
59 {
60 int i;
61 int out = 0;
62
63 if (a < 1 << 16)
64 return -log16((1LL << 32) / a);
65 a <<= 16;
66
67 for (i = 20; i >= 0; i--) {
68 int64_t b = exp16_table[i];
69 if (a < (b << 16))
70 continue;
71 out |= 1 << i;
72 a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
73 }
74 return out;
75 }
76
77 static uint64_t int_sqrt(uint64_t a)
78 {
79 uint64_t ret = 0;
80 uint64_t ret_sq = 0;
81 int s;
82
83 for (s = 31; s >= 0; s--) {
84 uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
85 if (b <= a) {
86 ret_sq = b;
87 ret += 1ULL << s;
88 }
89 }
90 return ret;
91 }
92
93 static int16_t get_s16l(uint8_t *p)
94 {
95 union {
96 uint16_t u;
97 int16_t s;
98 } v;
99 v.u = p[0] | p[1] << 8;
100 return v.s;
101 }
102
103 static float get_f32l(uint8_t *p)
104 {
105 union av_intfloat32 v;
106 v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
107 return v.f;
108 }
109
110 int main(int argc, char *argv[])
111 {
112 int i, j;
113 uint64_t sse = 0;
114 uint64_t dev;
115 FILE *f[2];
116 uint8_t buf[2][SIZE];
117 uint64_t psnr;
118 int len = 1;
119 int64_t max;
120 int shift = argc < 5 ? 0 : atoi(argv[4]);
121 int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
122 int size0 = 0;
123 int size1 = 0;
124 int maxdist = 0;
125
126 if (argc < 3) {
127 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
128 printf("WAV headers are skipped automatically.\n");
129 return 1;
130 }
131
132 if (argc > 3) {
133 if (!strcmp(argv[3], "u8")) {
134 len = 1;
135 } else if (!strcmp(argv[3], "s16")) {
136 len = 2;
137 } else if (!strcmp(argv[3], "f32")) {
138 len = 4;
139 } else {
140 char *end;
141 len = strtol(argv[3], &end, 0);
142 if (*end || len < 1 || len > 2) {
143 fprintf(stderr, "Unsupported sample format: %s\n", argv[3]);
144 return 1;
145 }
146 }
147 }
148
149 max = (1LL << (8 * len)) - 1;
150
151 f[0] = fopen(argv[1], "rb");
152 f[1] = fopen(argv[2], "rb");
153 if (!f[0] || !f[1]) {
154 fprintf(stderr, "Could not open input files.\n");
155 return 1;
156 }
157
158 for (i = 0; i < 2; i++) {
159 uint8_t *p = buf[i];
160 if (fread(p, 1, 12, f[i]) != 12)
161 return 1;
162 if (!memcmp(p, "RIFF", 4) &&
163 !memcmp(p + 8, "WAVE", 4)) {
164 if (fread(p, 1, 8, f[i]) != 8)
165 return 1;
166 while (memcmp(p, "data", 4)) {
167 int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
168 fseek(f[i], s, SEEK_CUR);
169 if (fread(p, 1, 8, f[i]) != 8)
170 return 1;
171 }
172 } else {
173 fseek(f[i], -12, SEEK_CUR);
174 }
175 }
176
177 fseek(f[shift < 0], abs(shift), SEEK_CUR);
178
179 fseek(f[0], skip_bytes, SEEK_CUR);
180 fseek(f[1], skip_bytes, SEEK_CUR);
181
182 for (;;) {
183 int s0 = fread(buf[0], 1, SIZE, f[0]);
184 int s1 = fread(buf[1], 1, SIZE, f[1]);
185
186 for (j = 0; j < FFMIN(s0, s1); j += len) {
187 int64_t a = buf[0][j];
188 int64_t b = buf[1][j];
189 int dist;
190 if (len == 2) {
191 a = get_s16l(buf[0] + j);
192 b = get_s16l(buf[1] + j);
193 } else if (len == 4) {
194 a = get_f32l(buf[0] + j) * (1 << 24);
195 b = get_f32l(buf[1] + j) * (1 << 24);
196 } else {
197 a = buf[0][j];
198 b = buf[1][j];
199 }
200 sse += (a - b) * (a - b);
201 dist = abs(a - b);
202 if (dist > maxdist)
203 maxdist = dist;
204 }
205 size0 += s0;
206 size1 += s1;
207 if (s0 + s1 <= 0)
208 break;
209 }
210
211 i = FFMIN(size0, size1) / len;
212 if (!i)
213 i = 1;
214 dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
215 if (sse)
216 psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
217 284619LL * F + (1LL << 31)) / (1LL << 32);
218 else
219 psnr = 1000 * F - 1; // floating point free infinity :)
220
221 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
222 (int)(dev / F), (int)(dev % F),
223 (int)(psnr / F), (int)(psnr % F),
224 maxdist, size0, size1);
225 return 0;
226 }