yading@11: /* yading@11: * Copyright (c) 2003 Michael Niedermayer yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include yading@11: #include yading@11: #include yading@11: #include yading@11: #include yading@11: yading@11: #include "libavutil/intfloat.h" yading@11: yading@11: #define FFMIN(a, b) ((a) > (b) ? (b) : (a)) yading@11: #define F 100 yading@11: #define SIZE 2048 yading@11: yading@11: uint64_t exp16_table[21] = { yading@11: 65537, yading@11: 65538, yading@11: 65540, yading@11: 65544, yading@11: 65552, yading@11: 65568, yading@11: 65600, yading@11: 65664, yading@11: 65793, yading@11: 66050, yading@11: 66568, yading@11: 67616, yading@11: 69763, yading@11: 74262, yading@11: 84150, yading@11: 108051, yading@11: 178145, yading@11: 484249, yading@11: 3578144, yading@11: 195360063, yading@11: 582360139072LL, yading@11: }; yading@11: yading@11: #if 0 yading@11: // 16.16 fixpoint exp() yading@11: static unsigned int exp16(unsigned int a){ yading@11: int i; yading@11: int out= 1<<16; yading@11: yading@11: for(i=19;i>=0;i--){ yading@11: if(a&(1<>16; yading@11: } yading@11: yading@11: return out; yading@11: } yading@11: #endif yading@11: yading@11: // 16.16 fixpoint log() yading@11: static int64_t log16(uint64_t a) yading@11: { yading@11: int i; yading@11: int out = 0; yading@11: yading@11: if (a < 1 << 16) yading@11: return -log16((1LL << 32) / a); yading@11: a <<= 16; yading@11: yading@11: for (i = 20; i >= 0; i--) { yading@11: int64_t b = exp16_table[i]; yading@11: if (a < (b << 16)) yading@11: continue; yading@11: out |= 1 << i; yading@11: a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b; yading@11: } yading@11: return out; yading@11: } yading@11: yading@11: static uint64_t int_sqrt(uint64_t a) yading@11: { yading@11: uint64_t ret = 0; yading@11: uint64_t ret_sq = 0; yading@11: int s; yading@11: yading@11: for (s = 31; s >= 0; s--) { yading@11: uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2; yading@11: if (b <= a) { yading@11: ret_sq = b; yading@11: ret += 1ULL << s; yading@11: } yading@11: } yading@11: return ret; yading@11: } yading@11: yading@11: static int16_t get_s16l(uint8_t *p) yading@11: { yading@11: union { yading@11: uint16_t u; yading@11: int16_t s; yading@11: } v; yading@11: v.u = p[0] | p[1] << 8; yading@11: return v.s; yading@11: } yading@11: yading@11: static float get_f32l(uint8_t *p) yading@11: { yading@11: union av_intfloat32 v; yading@11: v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; yading@11: return v.f; yading@11: } yading@11: yading@11: static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes) yading@11: { yading@11: int i, j; yading@11: uint64_t sse = 0; yading@11: uint64_t dev; yading@11: uint8_t buf[2][SIZE]; yading@11: uint64_t psnr; yading@11: int64_t max = (1LL << (8 * len)) - 1; yading@11: int size0 = 0; yading@11: int size1 = 0; yading@11: int maxdist = 0; yading@11: int noseek; yading@11: yading@11: noseek = fseek(f[0], 0, SEEK_SET) || yading@11: fseek(f[1], 0, SEEK_SET); yading@11: yading@11: if (!noseek) { yading@11: for (i = 0; i < 2; i++) { yading@11: uint8_t *p = buf[i]; yading@11: if (fread(p, 1, 12, f[i]) != 12) yading@11: return 1; yading@11: if (!memcmp(p, "RIFF", 4) && yading@11: !memcmp(p + 8, "WAVE", 4)) { yading@11: if (fread(p, 1, 8, f[i]) != 8) yading@11: return 1; yading@11: while (memcmp(p, "data", 4)) { yading@11: int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24; yading@11: fseek(f[i], s, SEEK_CUR); yading@11: if (fread(p, 1, 8, f[i]) != 8) yading@11: return 1; yading@11: } yading@11: } else { yading@11: fseek(f[i], -12, SEEK_CUR); yading@11: } yading@11: } yading@11: yading@11: fseek(f[shift < 0], abs(shift), SEEK_CUR); yading@11: yading@11: fseek(f[0], skip_bytes, SEEK_CUR); yading@11: fseek(f[1], skip_bytes, SEEK_CUR); yading@11: } yading@11: yading@11: for (;;) { yading@11: int s0 = fread(buf[0], 1, SIZE, f[0]); yading@11: int s1 = fread(buf[1], 1, SIZE, f[1]); yading@11: yading@11: for (j = 0; j < FFMIN(s0, s1); j += len) { yading@11: int64_t a = buf[0][j]; yading@11: int64_t b = buf[1][j]; yading@11: int dist; yading@11: if (len == 2) { yading@11: a = get_s16l(buf[0] + j); yading@11: b = get_s16l(buf[1] + j); yading@11: } else if (len == 4) { yading@11: a = get_f32l(buf[0] + j) * (1 << 24); yading@11: b = get_f32l(buf[1] + j) * (1 << 24); yading@11: } else { yading@11: a = buf[0][j]; yading@11: b = buf[1][j]; yading@11: } yading@11: sse += (a - b) * (a - b); yading@11: dist = abs(a - b); yading@11: if (dist > maxdist) yading@11: maxdist = dist; yading@11: } yading@11: size0 += s0; yading@11: size1 += s1; yading@11: if (s0 + s1 <= 0) yading@11: break; yading@11: } yading@11: yading@11: i = FFMIN(size0, size1) / len; yading@11: if (!i) yading@11: i = 1; yading@11: dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i); yading@11: if (sse) yading@11: psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) * yading@11: 284619LL * F + (1LL << 31)) / (1LL << 32); yading@11: else yading@11: psnr = 1000 * F - 1; // floating point free infinity :) yading@11: yading@11: printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n", yading@11: (int)(dev / F), (int)(dev % F), yading@11: (int)(psnr / F), (int)(psnr % F), yading@11: maxdist, size0, size1); yading@11: return psnr; yading@11: } yading@11: yading@11: int main(int argc, char *argv[]) yading@11: { yading@11: FILE *f[2]; yading@11: int len = 1; yading@11: int shift_first= argc < 5 ? 0 : atoi(argv[4]); yading@11: int skip_bytes = argc < 6 ? 0 : atoi(argv[5]); yading@11: int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6])); yading@11: int shift; yading@11: int max_psnr = -1; yading@11: int max_psnr_shift = 0; yading@11: yading@11: if (argc > 3) { yading@11: if (!strcmp(argv[3], "u8")) { yading@11: len = 1; yading@11: } else if (!strcmp(argv[3], "s16")) { yading@11: len = 2; yading@11: } else if (!strcmp(argv[3], "f32")) { yading@11: len = 4; yading@11: } else { yading@11: char *end; yading@11: len = strtol(argv[3], &end, 0); yading@11: if (*end || len < 1 || len > 2) { yading@11: fprintf(stderr, "Unsupported sample format: %s\n", argv[3]); yading@11: return 1; yading@11: } yading@11: } yading@11: } yading@11: yading@11: if (argc < 3) { yading@11: printf("tiny_psnr [ [ [ []]]]\n"); yading@11: printf("WAV headers are skipped automatically.\n"); yading@11: return 1; yading@11: } yading@11: yading@11: f[0] = fopen(argv[1], "rb"); yading@11: f[1] = fopen(argv[2], "rb"); yading@11: if (!f[0] || !f[1]) { yading@11: fprintf(stderr, "Could not open input files.\n"); yading@11: return 1; yading@11: } yading@11: yading@11: for (shift = shift_first; shift <= shift_last; shift++) { yading@11: int psnr = run_psnr(f, len, shift, skip_bytes); yading@11: if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) { yading@11: max_psnr = psnr; yading@11: max_psnr_shift = shift; yading@11: } yading@11: } yading@11: if (shift_last > shift_first) yading@11: printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift); yading@11: return 0; yading@11: }