mirror of
https://github.com/librempeg/librempeg
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ea1f47757b
* commit '7a00653be6b13131ce1b2cdeca696429f57caaf8': tiny_psnr: Support large files Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
325 lines
8.4 KiB
C
325 lines
8.4 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <math.h>
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#include <float.h>
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#include <limits.h>
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#include "libavutil/intfloat.h"
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#include "libavutil/intreadwrite.h"
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#define FFMIN(a, b) ((a) > (b) ? (b) : (a))
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#define F 100
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#define SIZE 2048
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uint64_t exp16_table[21] = {
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65537,
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65538,
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65540,
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65544,
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65552,
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65568,
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65600,
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65664,
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65793,
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66050,
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66568,
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67616,
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69763,
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74262,
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84150,
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108051,
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178145,
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484249,
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3578144,
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195360063,
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582360139072LL,
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};
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#if 0
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// 16.16 fixpoint exp()
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static unsigned int exp16(unsigned int a){
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int i;
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int out= 1<<16;
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for(i=19;i>=0;i--){
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if(a&(1<<i))
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out= (out*exp16_table[i] + (1<<15))>>16;
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}
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return out;
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}
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#endif
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// 16.16 fixpoint log()
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static int64_t log16(uint64_t a)
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{
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int i;
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int out = 0;
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if (a < 1 << 16)
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return -log16((1LL << 32) / a);
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a <<= 16;
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for (i = 20; i >= 0; i--) {
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int64_t b = exp16_table[i];
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if (a < (b << 16))
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continue;
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out |= 1 << i;
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a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
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}
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return out;
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}
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static uint64_t int_sqrt(uint64_t a)
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{
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uint64_t ret = 0;
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uint64_t ret_sq = 0;
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int s;
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for (s = 31; s >= 0; s--) {
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uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
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if (b <= a) {
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ret_sq = b;
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ret += 1ULL << s;
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}
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}
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return ret;
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}
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static int16_t get_s16l(uint8_t *p)
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{
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union {
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uint16_t u;
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int16_t s;
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} v;
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v.u = p[0] | p[1] << 8;
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return v.s;
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}
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static float get_f32l(uint8_t *p)
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{
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union av_intfloat32 v;
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v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
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return v.f;
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}
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static double get_f64l(uint8_t *p)
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{
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return av_int2double(AV_RL64(p));
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}
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static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes)
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{
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uint64_t i, j;
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uint64_t sse = 0;
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double sse_d = 0.0;
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uint8_t buf[2][SIZE];
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int64_t max = (1LL << (8 * len)) - 1;
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uint64_t size0 = 0;
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uint64_t size1 = 0;
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uint64_t maxdist = 0;
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double maxdist_d = 0.0;
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int noseek;
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noseek = fseek(f[0], 0, SEEK_SET) ||
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fseek(f[1], 0, SEEK_SET);
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if (!noseek) {
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for (i = 0; i < 2; i++) {
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uint8_t *p = buf[i];
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if (fread(p, 1, 12, f[i]) != 12)
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return -1;
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if (!memcmp(p, "RIFF", 4) &&
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!memcmp(p + 8, "WAVE", 4)) {
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if (fread(p, 1, 8, f[i]) != 8)
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return -1;
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while (memcmp(p, "data", 4)) {
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int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
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fseek(f[i], s, SEEK_CUR);
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if (fread(p, 1, 8, f[i]) != 8)
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return -1;
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}
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} else {
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fseek(f[i], -12, SEEK_CUR);
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}
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}
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fseek(f[shift < 0], abs(shift), SEEK_CUR);
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fseek(f[0], skip_bytes, SEEK_CUR);
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fseek(f[1], skip_bytes, SEEK_CUR);
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}
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for (;;) {
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int s0 = fread(buf[0], 1, SIZE, f[0]);
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int s1 = fread(buf[1], 1, SIZE, f[1]);
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for (j = 0; j < FFMIN(s0, s1); j += len) {
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switch (len) {
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case 1:
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case 2: {
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int64_t a, b;
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int dist;
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if (len == 2) {
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a = get_s16l(buf[0] + j);
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b = get_s16l(buf[1] + j);
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} else {
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a = buf[0][j];
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b = buf[1][j];
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}
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sse += (a - b) * (a - b);
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dist = llabs(a - b);
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if (dist > maxdist)
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maxdist = dist;
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break;
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}
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case 4:
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case 8: {
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double dist, a, b;
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if (len == 8) {
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a = get_f64l(buf[0] + j);
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b = get_f64l(buf[1] + j);
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} else {
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a = get_f32l(buf[0] + j);
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b = get_f32l(buf[1] + j);
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}
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dist = fabs(a - b);
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sse_d += (a - b) * (a - b);
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if (dist > maxdist_d)
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maxdist_d = dist;
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break;
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}
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}
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}
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size0 += s0;
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size1 += s1;
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if (s0 + s1 <= 0)
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break;
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}
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i = FFMIN(size0, size1) / len;
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if (!i)
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i = 1;
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switch (len) {
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case 1:
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case 2: {
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uint64_t psnr;
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uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
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if (sse)
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psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
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284619LL * F + (1LL << 31)) / (1LL << 32);
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else
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psnr = 1000 * F - 1; // floating point free infinity :)
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printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
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(int)(dev / F), (int)(dev % F),
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(int)(psnr / F), (int)(psnr % F),
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maxdist, size0, size1);
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return psnr;
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}
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case 4:
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case 8: {
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char psnr_str[64];
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double psnr = INT_MAX;
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double dev = sqrt(sse_d / i);
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uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32);
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if (sse_d) {
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psnr = 2 * log(DBL_MAX) - log(i / sse_d);
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snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr);
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} else
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snprintf(psnr_str, sizeof(psnr_str), "inf");
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maxdist = maxdist_d * scale;
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printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
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dev * scale, psnr_str, maxdist, size0, size1);
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return psnr;
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}
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}
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return -1;
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}
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int main(int argc, char *argv[])
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{
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FILE *f[2];
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int len = 1;
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int shift_first= argc < 5 ? 0 : atoi(argv[4]);
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int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
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int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6]));
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int shift;
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int max_psnr = -1;
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int max_psnr_shift = 0;
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if (shift_last > shift_first)
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shift_first -= shift_last - shift_first;
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if (argc > 3) {
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if (!strcmp(argv[3], "u8")) {
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len = 1;
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} else if (!strcmp(argv[3], "s16")) {
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len = 2;
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} else if (!strcmp(argv[3], "f32")) {
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len = 4;
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} else if (!strcmp(argv[3], "f64")) {
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len = 8;
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} else {
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char *end;
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len = strtol(argv[3], &end, 0);
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if (*end || len < 1 || len > 2) {
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fprintf(stderr, "Unsupported sample format: %s\nSupported: u8, s16, f32, f64\n", argv[3]);
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return 1;
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}
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}
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}
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if (argc < 3) {
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printf("tiny_psnr <file1> <file2> [<elem size>|u8|s16|f32|f64 [<shift> [<skip bytes> [<shift search range>]]]]\n");
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printf("WAV headers are skipped automatically.\n");
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return 1;
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}
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f[0] = fopen(argv[1], "rb");
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f[1] = fopen(argv[2], "rb");
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if (!f[0] || !f[1]) {
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fprintf(stderr, "Could not open input files.\n");
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return 1;
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}
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for (shift = shift_first; shift <= shift_last; shift++) {
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int psnr = run_psnr(f, len, shift, skip_bytes);
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if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) {
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max_psnr = psnr;
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max_psnr_shift = shift;
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}
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}
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if (max_psnr < 0)
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return 2;
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if (shift_last > shift_first)
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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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return 0;
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}
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