Add back previously removed non-existing function params in doxygen comments.
[libav.git] / tests / tiny_psnr.c
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1/*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
244e1e64 9 * version 2.1 of the License, or (at your option) any later version.
67cbe681 10 *
244e1e64 11 * FFmpeg is distributed in the hope that it will be useful,
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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
244e1e64 17 * License along with FFmpeg; if not, write to the Free Software
5509bffa 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
20
21#include <stdio.h>
ba96e97f 22#include <stdlib.h>
67cbe681 23#include <inttypes.h>
9e2a16e1 24#include <assert.h>
67cbe681 25
1e90317b 26#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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27#define F 100
28#define SIZE 2048
29
0c90161f 30uint64_t exp16_table[21]={
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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,
0c90161f 51 582360139072LL,
9e2a16e1 52};
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53
54#if 0
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55// 16.16 fixpoint exp()
56static 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 }
9e2a16e1 64
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65 return out;
66}
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67#endif
68
9e2a16e1 69// 16.16 fixpoint log()
0c90161f 70static int64_t log16(uint64_t a){
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71 int i;
72 int out=0;
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73
74 if(a < 1<<16)
75 return -log16((1LL<<32) / a);
9e2a16e1 76 a<<=16;
115329f1 77
0c90161f 78 for(i=20;i>=0;i--){
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79 int64_t b= exp16_table[i];
80 if(a<(b<<16)) continue;
9e2a16e1 81 out |= 1<<i;
8176bd1a 82 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
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83 }
84 return out;
85}
86
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87static 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
103int 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];
9e2a16e1 109 uint64_t psnr;
ba96e97f 110 int len= argc<4 ? 1 : atoi(argv[3]);
0c90161f 111 int64_t max= (1<<(8*len))-1;
ba96e97f 112 int shift= argc<5 ? 0 : atoi(argv[4]);
b8889ea5 113 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
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114 int size0=0;
115 int size1=0;
115329f1 116
0c90161f 117 if(argc<3){
b8889ea5 118 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
cc8de8e8 119 printf("For WAV files use the following:\n");
b8889ea5 120 printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
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121 return -1;
122 }
115329f1 123
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124 f[0]= fopen(argv[1], "rb");
125 f[1]= fopen(argv[2], "rb");
e740c796 126 if(!f[0] || !f[1]){
cc8de8e8 127 fprintf(stderr, "Could not open input files.\n");
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128 return -1;
129 }
ba96e97f 130 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
67cbe681 131
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132 fseek(f[0],skip_bytes,SEEK_CUR);
133 fseek(f[1],skip_bytes,SEEK_CUR);
134
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135 for(;;){
136 int s0= fread(buf[0], 1, SIZE, f[0]);
137 int s1= fread(buf[1], 1, SIZE, f[1]);
115329f1 138
1e90317b 139 for(j=0; j<FFMIN(s0,s1); j++){
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140 int64_t a= buf[0][j];
141 int64_t b= buf[1][j];
142 if(len==2){
143 a= (int16_t)(a | (buf[0][++j]<<8));
144 b= (int16_t)(b | (buf[1][ j]<<8));
145 }
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146 sse += (a-b) * (a-b);
147 }
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148 size0 += s0;
149 size1 += s1;
150 if(s0+s1<=0)
151 break;
67cbe681 152 }
115329f1 153
1e90317b 154 i= FFMIN(size0,size1)/len;
eeaa742c 155 if(!i) i=1;
0c90161f 156 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
9e2a16e1 157 if(sse)
b00803e0 158 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
9e2a16e1 159 else
1e90317b 160 psnr= 1000*F-1; //floating point free infinity :)
115329f1 161
1e90317b 162 printf("stddev:%5d.%02d PSNR:%3d.%02d bytes:%9d/%9d\n",
115329f1 163 (int)(dev/F), (int)(dev%F),
9e2a16e1 164 (int)(psnr/F), (int)(psnr%F),
1e90317b 165 size0, size1);
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166 return 0;
167}
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168
169