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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2003 Michael Niedermayer |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 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 |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 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 |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include |
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| 22 | #include |
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| 23 | #include |
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| 24 | #include |
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| 25 | #include |
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| 26 | #include |
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| 27 | #include |
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| 28 | |||
| 29 | #include "libavutil/intfloat.h" |
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| 30 | #include "libavutil/intreadwrite.h" |
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| 31 | |||
| 32 | #define FFMIN(a, b) ((a) > (b) ? (b) : (a)) |
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| 33 | #define F 100 |
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| 34 | #define SIZE 2048 |
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| 35 | |||
| 36 | uint64_t exp16_table[21] = { |
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| 37 | 65537, |
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| 38 | 65538, |
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| 39 | 65540, |
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| 40 | 65544, |
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| 41 | 65552, |
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| 42 | 65568, |
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| 43 | 65600, |
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| 44 | 65664, |
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| 45 | 65793, |
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| 46 | 66050, |
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| 47 | 66568, |
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| 48 | 67616, |
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| 49 | 69763, |
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| 50 | 74262, |
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| 51 | 84150, |
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| 52 | 108051, |
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| 53 | 178145, |
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| 54 | 484249, |
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| 55 | 3578144, |
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| 56 | 195360063, |
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| 57 | 582360139072LL, |
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| 58 | }; |
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| 59 | |||
| 60 | #if 0 |
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| 61 | // 16.16 fixpoint exp() |
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| 62 | static unsigned int exp16(unsigned int a){ |
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| 63 | int i; |
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| 64 | int out= 1<<16; |
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| 65 | |||
| 66 | for(i=19;i>=0;i--){ |
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| 67 | if(a&(1< |
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| 68 | out= (out*exp16_table[i] + (1<<15))>>16; |
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| 69 | } |
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| 70 | |||
| 71 | return out; |
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| 72 | } |
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| 73 | #endif |
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| 74 | |||
| 75 | // 16.16 fixpoint log() |
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| 76 | static int64_t log16(uint64_t a) |
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| 77 | { |
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| 78 | int i; |
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| 79 | int out = 0; |
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| 80 | |||
| 81 | if (a < 1 << 16) |
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| 82 | return -log16((1LL << 32) / a); |
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| 83 | a <<= 16; |
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| 84 | |||
| 85 | for (i = 20; i >= 0; i--) { |
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| 86 | int64_t b = exp16_table[i]; |
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| 87 | if (a < (b << 16)) |
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| 88 | continue; |
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| 89 | out |= 1 << i; |
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| 90 | a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b; |
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| 91 | } |
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| 92 | return out; |
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| 93 | } |
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| 94 | |||
| 95 | static uint64_t int_sqrt(uint64_t a) |
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| 96 | { |
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| 97 | uint64_t ret = 0; |
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| 98 | uint64_t ret_sq = 0; |
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| 99 | int s; |
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| 100 | |||
| 101 | for (s = 31; s >= 0; s--) { |
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| 102 | uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2; |
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| 103 | if (b <= a) { |
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| 104 | ret_sq = b; |
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| 105 | ret += 1ULL << s; |
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| 106 | } |
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| 107 | } |
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| 108 | return ret; |
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| 109 | } |
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| 110 | |||
| 111 | static int16_t get_s16l(uint8_t *p) |
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| 112 | { |
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| 113 | union { |
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| 114 | uint16_t u; |
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| 115 | int16_t s; |
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| 116 | } v; |
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| 117 | v.u = p[0] | p[1] << 8; |
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| 118 | return v.s; |
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| 119 | } |
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| 120 | |||
| 121 | static float get_f32l(uint8_t *p) |
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| 122 | { |
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| 123 | union av_intfloat32 v; |
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| 124 | v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; |
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| 125 | return v.f; |
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| 126 | } |
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| 127 | |||
| 128 | static double get_f64l(uint8_t *p) |
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| 129 | { |
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| 130 | return av_int2double(AV_RL64(p)); |
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| 131 | } |
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| 132 | |||
| 133 | static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes) |
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| 134 | { |
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| 135 | int i, j; |
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| 136 | uint64_t sse = 0; |
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| 137 | double sse_d = 0.0; |
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| 138 | uint8_t buf[2][SIZE]; |
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| 139 | int64_t max = (1LL << (8 * len)) - 1; |
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| 140 | int size0 = 0; |
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| 141 | int size1 = 0; |
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| 142 | uint64_t maxdist = 0; |
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| 143 | double maxdist_d = 0.0; |
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| 144 | int noseek; |
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| 145 | |||
| 146 | noseek = fseek(f[0], 0, SEEK_SET) || |
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| 147 | fseek(f[1], 0, SEEK_SET); |
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| 148 | |||
| 149 | if (!noseek) { |
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| 150 | for (i = 0; i < 2; i++) { |
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| 151 | uint8_t *p = buf[i]; |
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| 152 | if (fread(p, 1, 12, f[i]) != 12) |
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| 153 | return 1; |
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| 154 | if (!memcmp(p, "RIFF", 4) && |
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| 155 | !memcmp(p + 8, "WAVE", 4)) { |
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| 156 | if (fread(p, 1, 8, f[i]) != 8) |
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| 157 | return 1; |
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| 158 | while (memcmp(p, "data", 4)) { |
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| 159 | int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24; |
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| 160 | fseek(f[i], s, SEEK_CUR); |
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| 161 | if (fread(p, 1, 8, f[i]) != 8) |
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| 162 | return 1; |
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| 163 | } |
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| 164 | } else { |
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| 165 | fseek(f[i], -12, SEEK_CUR); |
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| 166 | } |
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| 167 | } |
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| 168 | |||
| 169 | fseek(f[shift < 0], abs(shift), SEEK_CUR); |
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| 170 | |||
| 171 | fseek(f[0], skip_bytes, SEEK_CUR); |
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| 172 | fseek(f[1], skip_bytes, SEEK_CUR); |
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| 173 | } |
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| 174 | |||
| 175 | for (;;) { |
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| 176 | int s0 = fread(buf[0], 1, SIZE, f[0]); |
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| 177 | int s1 = fread(buf[1], 1, SIZE, f[1]); |
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| 178 | |||
| 179 | for (j = 0; j < FFMIN(s0, s1); j += len) { |
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| 180 | switch (len) { |
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| 181 | case 1: |
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| 182 | case 2: { |
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| 183 | int64_t a = buf[0][j]; |
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| 184 | int64_t b = buf[1][j]; |
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| 185 | int dist; |
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| 186 | if (len == 2) { |
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| 187 | a = get_s16l(buf[0] + j); |
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| 188 | b = get_s16l(buf[1] + j); |
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| 189 | } else { |
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| 190 | a = buf[0][j]; |
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| 191 | b = buf[1][j]; |
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| 192 | } |
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| 193 | sse += (a - b) * (a - b); |
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| 194 | dist = abs(a - b); |
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| 195 | if (dist > maxdist) |
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| 196 | maxdist = dist; |
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| 197 | break; |
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| 198 | } |
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| 199 | case 4: |
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| 200 | case 8: { |
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| 201 | double dist, a, b; |
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| 202 | if (len == 8) { |
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| 203 | a = get_f64l(buf[0] + j); |
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| 204 | b = get_f64l(buf[1] + j); |
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| 205 | } else { |
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| 206 | a = get_f32l(buf[0] + j); |
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| 207 | b = get_f32l(buf[1] + j); |
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| 208 | } |
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| 209 | dist = fabs(a - b); |
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| 210 | sse_d += (a - b) * (a - b); |
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| 211 | if (dist > maxdist_d) |
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| 212 | maxdist_d = dist; |
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| 213 | break; |
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| 214 | } |
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| 215 | } |
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| 216 | } |
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| 217 | size0 += s0; |
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| 218 | size1 += s1; |
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| 219 | if (s0 + s1 <= 0) |
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| 220 | break; |
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| 221 | } |
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| 222 | |||
| 223 | i = FFMIN(size0, size1) / len; |
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| 224 | if (!i) |
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| 225 | i = 1; |
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| 226 | switch (len) { |
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| 227 | case 1: |
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| 228 | case 2: { |
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| 229 | uint64_t psnr; |
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| 230 | uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i); |
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| 231 | if (sse) |
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| 232 | psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) * |
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| 233 | 284619LL * F + (1LL << 31)) / (1LL << 32); |
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| 234 | else |
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| 235 | psnr = 1000 * F - 1; // floating point free infinity :) |
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| 236 | |||
| 237 | printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9d/%9d\n", |
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| 238 | (int)(dev / F), (int)(dev % F), |
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| 239 | (int)(psnr / F), (int)(psnr % F), |
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| 240 | maxdist, size0, size1); |
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| 241 | return psnr; |
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| 242 | } |
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| 243 | case 4: |
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| 244 | case 8: { |
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| 245 | char psnr_str[64]; |
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| 246 | double psnr = INT_MAX; |
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| 247 | double dev = sqrt(sse_d / i); |
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| 248 | uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32); |
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| 249 | |||
| 250 | if (sse_d) { |
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| 251 | psnr = 2 * log(DBL_MAX) - log(i / sse_d); |
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| 252 | snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr); |
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| 253 | } else |
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| 254 | snprintf(psnr_str, sizeof(psnr_str), "inf"); |
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| 255 | |||
| 256 | maxdist = maxdist_d * scale; |
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| 257 | |||
| 258 | printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9d/%9d\n", |
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| 259 | dev * scale, psnr_str, maxdist, size0, size1); |
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| 260 | return psnr; |
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| 261 | } |
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| 262 | } |
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| 263 | return -1; |
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| 264 | } |
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| 265 | |||
| 266 | int main(int argc, char *argv[]) |
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| 267 | { |
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| 268 | FILE *f[2]; |
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| 269 | int len = 1; |
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| 270 | int shift_first= argc < 5 ? 0 : atoi(argv[4]); |
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| 271 | int skip_bytes = argc < 6 ? 0 : atoi(argv[5]); |
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| 272 | int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6])); |
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| 273 | int shift; |
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| 274 | int max_psnr = -1; |
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| 275 | int max_psnr_shift = 0; |
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| 276 | |||
| 277 | if (argc > 3) { |
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| 278 | if (!strcmp(argv[3], "u8")) { |
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| 279 | len = 1; |
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| 280 | } else if (!strcmp(argv[3], "s16")) { |
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| 281 | len = 2; |
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| 282 | } else if (!strcmp(argv[3], "f32")) { |
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| 283 | len = 4; |
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| 284 | } else if (!strcmp(argv[3], "f64")) { |
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| 285 | len = 8; |
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| 286 | } else { |
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| 287 | char *end; |
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| 288 | len = strtol(argv[3], &end, 0); |
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| 289 | if (*end || len < 1 || len > 2) { |
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| 290 | fprintf(stderr, "Unsupported sample format: %s\n", argv[3]); |
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| 291 | return 1; |
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| 292 | } |
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| 293 | } |
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| 294 | } |
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| 295 | |||
| 296 | if (argc < 3) { |
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| 297 | printf("tiny_psnr |
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| 298 | printf("WAV headers are skipped automatically.\n"); |
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| 299 | return 1; |
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| 300 | } |
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| 301 | |||
| 302 | f[0] = fopen(argv[1], "rb"); |
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| 303 | f[1] = fopen(argv[2], "rb"); |
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| 304 | if (!f[0] || !f[1]) { |
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| 305 | fprintf(stderr, "Could not open input files.\n"); |
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| 306 | return 1; |
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| 307 | } |
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| 308 | |||
| 309 | for (shift = shift_first; shift <= shift_last; shift++) { |
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| 310 | int psnr = run_psnr(f, len, shift, skip_bytes); |
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| 311 | if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) { |
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| 312 | max_psnr = psnr; |
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| 313 | max_psnr_shift = shift; |
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| 314 | } |
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| 315 | } |
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| 316 | if (shift_last > shift_first) |
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| 317 | printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift); |
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| 318 | return 0; |
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| 319 | } |