/* * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <inttypes.h> #include <math.h> #include <float.h> #include <limits.h> #include "libavutil/intfloat.h" #include "libavutil/intreadwrite.h" #define FFMIN(a, b) ((a) > (b) ? (b) : (a)) #define F 100 #define SIZE 2048 uint64_t exp16_table[21] = { 65537, 65538, 65540, 65544, 65552, 65568, 65600, 65664, 65793, 66050, 66568, 67616, 69763, 74262, 84150, 108051, 178145, 484249, 3578144, 195360063, 582360139072LL, }; #if 0 // 16.16 fixpoint exp() static unsigned int exp16(unsigned int a){ int i; int out= 1<<16; for(i=19;i>=0;i--){ if(a&(1<<i)) out= (out*exp16_table[i] + (1<<15))>>16; } return out; } #endif // 16.16 fixpoint log() static int64_t log16(uint64_t a) { int i; int out = 0; if (a < 1 << 16) return -log16((1LL << 32) / a); a <<= 16; for (i = 20; i >= 0; i--) { int64_t b = exp16_table[i]; if (a < (b << 16)) continue; out |= 1 << i; a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b; } return out; } static uint64_t int_sqrt(uint64_t a) { uint64_t ret = 0; uint64_t ret_sq = 0; int s; for (s = 31; s >= 0; s--) { uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2; if (b <= a) { ret_sq = b; ret += 1ULL << s; } } return ret; } static int16_t get_s16l(uint8_t *p) { union { uint16_t u; int16_t s; } v; v.u = p[0] | p[1] << 8; return v.s; } static float get_f32l(uint8_t *p) { union av_intfloat32 v; v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; return v.f; } static double get_f64l(uint8_t *p) { return av_int2double(AV_RL64(p)); } static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes) { uint64_t i, j; uint64_t sse = 0; double sse_d = 0.0; uint8_t buf[2][SIZE]; int64_t max = (1LL << (8 * len)) - 1; uint64_t size0 = 0; uint64_t size1 = 0; uint64_t maxdist = 0; double maxdist_d = 0.0; int noseek; noseek = fseek(f[0], 0, SEEK_SET) || fseek(f[1], 0, SEEK_SET); if (!noseek) { for (i = 0; i < 2; i++) { uint8_t *p = buf[i]; if (fread(p, 1, 12, f[i]) != 12) return -1; if (!memcmp(p, "RIFF", 4) && !memcmp(p + 8, "WAVE", 4)) { if (fread(p, 1, 8, f[i]) != 8) return -1; while (memcmp(p, "data", 4)) { int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24; fseek(f[i], s, SEEK_CUR); if (fread(p, 1, 8, f[i]) != 8) return -1; } } else { fseek(f[i], -12, SEEK_CUR); } } fseek(f[shift < 0], abs(shift), SEEK_CUR); fseek(f[0], skip_bytes, SEEK_CUR); fseek(f[1], skip_bytes, SEEK_CUR); } for (;;) { int s0 = fread(buf[0], 1, SIZE, f[0]); int s1 = fread(buf[1], 1, SIZE, f[1]); for (j = 0; j < FFMIN(s0, s1); j += len) { switch (len) { case 1: case 2: { int64_t a, b; int dist; if (len == 2) { a = get_s16l(buf[0] + j); b = get_s16l(buf[1] + j); } else { a = buf[0][j]; b = buf[1][j]; } sse += (a - b) * (a - b); dist = llabs(a - b); if (dist > maxdist) maxdist = dist; break; } case 4: case 8: { double dist, a, b; if (len == 8) { a = get_f64l(buf[0] + j); b = get_f64l(buf[1] + j); } else { a = get_f32l(buf[0] + j); b = get_f32l(buf[1] + j); } dist = fabs(a - b); sse_d += (a - b) * (a - b); if (dist > maxdist_d) maxdist_d = dist; break; } } } size0 += s0; size1 += s1; if (s0 + s1 <= 0) break; } i = FFMIN(size0, size1) / len; if (!i) i = 1; switch (len) { case 1: case 2: { uint64_t psnr; uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i); if (sse) psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) * 284619LL * F + (1LL << 31)) / (1LL << 32); else psnr = 1000 * F - 1; // floating point free infinity :) printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n", (int)(dev / F), (int)(dev % F), (int)(psnr / F), (int)(psnr % F), maxdist, size0, size1); return psnr; } case 4: case 8: { char psnr_str[64]; double psnr = INT_MAX; double dev = sqrt(sse_d / i); uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32); if (sse_d) { psnr = 2 * log(DBL_MAX) - log(i / sse_d); snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr); } else snprintf(psnr_str, sizeof(psnr_str), "inf"); maxdist = maxdist_d * scale; printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n", dev * scale, psnr_str, maxdist, size0, size1); return psnr; } } return -1; } int main(int argc, char *argv[]) { FILE *f[2]; int len = 1; int shift_first= argc < 5 ? 0 : atoi(argv[4]); int skip_bytes = argc < 6 ? 0 : atoi(argv[5]); int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6])); int shift; int max_psnr = -1; int max_psnr_shift = 0; if (shift_last > shift_first) shift_first -= shift_last - shift_first; if (argc > 3) { if (!strcmp(argv[3], "u8")) { len = 1; } else if (!strcmp(argv[3], "s16")) { len = 2; } else if (!strcmp(argv[3], "f32")) { len = 4; } else if (!strcmp(argv[3], "f64")) { len = 8; } else { char *end; len = strtol(argv[3], &end, 0); if (*end || len < 1 || len > 2) { fprintf(stderr, "Unsupported sample format: %s\nSupported: u8, s16, f32, f64\n", argv[3]); return 1; } } } if (argc < 3) { printf("tiny_psnr <file1> <file2> [<elem size>|u8|s16|f32|f64 [<shift> [<skip bytes> [<shift search range>]]]]\n"); printf("WAV headers are skipped automatically.\n"); return 1; } f[0] = fopen(argv[1], "rb"); f[1] = fopen(argv[2], "rb"); if (!f[0] || !f[1]) { fprintf(stderr, "Could not open input files.\n"); return 1; } for (shift = shift_first; shift <= shift_last; shift++) { int psnr = run_psnr(f, len, shift, skip_bytes); if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) { max_psnr = psnr; max_psnr_shift = shift; } } if (max_psnr < 0) return 2; if (shift_last > shift_first) printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift); return 0; }