/* * 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;}