Libav
tiny_psnr.c
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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 <math.h>
26 #include <float.h>
27 
28 #include "libavutil/intfloat.h"
29 #include "libavutil/intreadwrite.h"
30 
31 #define FFMIN(a, b) ((a) > (b) ? (b) : (a))
32 #define F 100
33 #define SIZE 2048
34 
35 uint64_t exp16_table[21] = {
36  65537,
37  65538,
38  65540,
39  65544,
40  65552,
41  65568,
42  65600,
43  65664,
44  65793,
45  66050,
46  66568,
47  67616,
48  69763,
49  74262,
50  84150,
51  108051,
52  178145,
53  484249,
54  3578144,
55  195360063,
56  582360139072LL,
57 };
58 
59 // 16.16 fixpoint log()
60 static int64_t log16(uint64_t a)
61 {
62  int i;
63  int out = 0;
64 
65  if (a < 1 << 16)
66  return -log16((1LL << 32) / a);
67  a <<= 16;
68 
69  for (i = 20; i >= 0; i--) {
70  int64_t b = exp16_table[i];
71  if (a < (b << 16))
72  continue;
73  out |= 1 << i;
74  a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
75  }
76  return out;
77 }
78 
79 static uint64_t int_sqrt(uint64_t a)
80 {
81  uint64_t ret = 0;
82  uint64_t ret_sq = 0;
83  int s;
84 
85  for (s = 31; s >= 0; s--) {
86  uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
87  if (b <= a) {
88  ret_sq = b;
89  ret += 1ULL << s;
90  }
91  }
92  return ret;
93 }
94 
95 static int16_t get_s16l(uint8_t *p)
96 {
97  union {
98  uint16_t u;
99  int16_t s;
100  } v;
101  v.u = p[0] | p[1] << 8;
102  return v.s;
103 }
104 
105 static float get_f32l(uint8_t *p)
106 {
107  union av_intfloat32 v;
108  v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
109  return v.f;
110 }
111 
112 static double get_f64l(uint8_t *p)
113 {
114  return av_int2double(AV_RL64(p));
115 }
116 
117 int main(int argc, char *argv[])
118 {
119  uint64_t i, j;
120  uint64_t sse = 0;
121  double sse_d = 0.0;
122  FILE *f[2];
123  uint8_t buf[2][SIZE];
124  int len = 1;
125  int64_t max;
126  int shift = argc < 5 ? 0 : atoi(argv[4]);
127  int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
128  uint64_t size0 = 0;
129  uint64_t size1 = 0;
130  uint64_t maxdist = 0;
131  double maxdist_d = 0.0;
132 
133  if (argc < 3) {
134  printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
135  printf("WAV headers are skipped automatically.\n");
136  return 1;
137  }
138 
139  if (argc > 3) {
140  if (!strcmp(argv[3], "u8")) {
141  len = 1;
142  } else if (!strcmp(argv[3], "s16")) {
143  len = 2;
144  } else if (!strcmp(argv[3], "f32")) {
145  len = 4;
146  } else if (!strcmp(argv[3], "f64")) {
147  len = 8;
148  } else {
149  char *end;
150  len = strtol(argv[3], &end, 0);
151  if (*end || len < 1 || len > 2) {
152  fprintf(stderr, "Unsupported sample format: %s\n", argv[3]);
153  return 1;
154  }
155  }
156  }
157 
158  max = (1LL << (8 * len)) - 1;
159 
160  f[0] = fopen(argv[1], "rb");
161  f[1] = fopen(argv[2], "rb");
162  if (!f[0] || !f[1]) {
163  fprintf(stderr, "Could not open input files.\n");
164  return 1;
165  }
166 
167  for (i = 0; i < 2; i++) {
168  uint8_t *p = buf[i];
169  if (fread(p, 1, 12, f[i]) != 12)
170  return 1;
171  if (!memcmp(p, "RIFF", 4) &&
172  !memcmp(p + 8, "WAVE", 4)) {
173  if (fread(p, 1, 8, f[i]) != 8)
174  return 1;
175  while (memcmp(p, "data", 4)) {
176  int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
177  fseek(f[i], s, SEEK_CUR);
178  if (fread(p, 1, 8, f[i]) != 8)
179  return 1;
180  }
181  } else {
182  fseek(f[i], -12, SEEK_CUR);
183  }
184  }
185 
186  fseek(f[shift < 0], abs(shift), SEEK_CUR);
187 
188  fseek(f[0], skip_bytes, SEEK_CUR);
189  fseek(f[1], skip_bytes, SEEK_CUR);
190 
191  for (;;) {
192  int s0 = fread(buf[0], 1, SIZE, f[0]);
193  int s1 = fread(buf[1], 1, SIZE, f[1]);
194 
195  for (j = 0; j < FFMIN(s0, s1); j += len) {
196  switch (len) {
197  case 1:
198  case 2: {
199  int64_t a = buf[0][j];
200  int64_t b = buf[1][j];
201  int dist;
202  if (len == 2) {
203  a = get_s16l(buf[0] + j);
204  b = get_s16l(buf[1] + j);
205  } else {
206  a = buf[0][j];
207  b = buf[1][j];
208  }
209  sse += (a - b) * (a - b);
210  dist = llabs(a - b);
211  if (dist > maxdist)
212  maxdist = dist;
213  break;
214  }
215  case 4:
216  case 8: {
217  double dist, a, b;
218  if (len == 8) {
219  a = get_f64l(buf[0] + j);
220  b = get_f64l(buf[1] + j);
221  } else {
222  a = get_f32l(buf[0] + j);
223  b = get_f32l(buf[1] + j);
224  }
225  dist = fabs(a - b);
226  sse_d += (a - b) * (a - b);
227  if (dist > maxdist_d)
228  maxdist_d = dist;
229  break;
230  }
231  }
232  }
233  size0 += s0;
234  size1 += s1;
235  if (s0 + s1 <= 0)
236  break;
237  }
238 
239  i = FFMIN(size0, size1) / len;
240  if (!i)
241  i = 1;
242  switch (len) {
243  case 1:
244  case 2: {
245  uint64_t psnr;
246  uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
247  if (sse)
248  psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
249  284619LL * F + (1LL << 31)) / (1LL << 32);
250  else
251  psnr = 1000 * F - 1; // floating point free infinity :)
252 
253  printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
254  (int)(dev / F), (int)(dev % F),
255  (int)(psnr / F), (int)(psnr % F),
256  maxdist, size0, size1);
257  break;
258  }
259  case 4:
260  case 8: {
261  char psnr_str[64];
262  double dev = sqrt(sse_d / i);
263  uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32);
264 
265  if (sse_d) {
266  double psnr = 2 * log(DBL_MAX) - log(i / sse_d);
267  snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr);
268  } else
269  snprintf(psnr_str, sizeof(psnr_str), "inf");
270 
271  maxdist = maxdist_d * scale;
272 
273  printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
274  dev * scale, psnr_str, maxdist, size0, size1);
275  break;
276  }
277  }
278  return 0;
279 }
#define F
Definition: tiny_psnr.c:32
static int64_t log16(uint64_t a)
Definition: tiny_psnr.c:60
uint64_t exp16_table[21]
Definition: tiny_psnr.c:35
static int sse(MpegEncContext *s, uint8_t *src1, uint8_t *src2, int w, int h, int stride)
#define AV_RL64
Definition: intreadwrite.h:173
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
#define b
Definition: input.c:52
static av_unused const uint8_t * skip_bytes(CABACContext *c, int n)
Skip n bytes and reset the decoder.
int main(int argc, char *argv[])
Definition: tiny_psnr.c:117
static uint64_t int_sqrt(uint64_t a)
Definition: tiny_psnr.c:79
uint32_t i
Definition: intfloat.h:28
static float get_f32l(uint8_t *p)
Definition: tiny_psnr.c:105
static double psnr(double d)
Definition: avconv.c:616
#define SIZE
Definition: tiny_psnr.c:33
static int16_t get_s16l(uint8_t *p)
Definition: tiny_psnr.c:95
#define u(width,...)
int len
FILE * out
Definition: movenc.c:54
static double get_f64l(uint8_t *p)
Definition: tiny_psnr.c:112
#define FFMIN(a, b)
Definition: tiny_psnr.c:31