/* * 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 <assert.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; int s; uint64_t ret_sq=0; 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; } int main(int argc,char* argv[]){ int i, j; uint64_t sse=0; uint64_t dev; FILE *f[2]; uint8_t buf[2][SIZE]; uint64_t psnr; int len= argc<4 ? 1 : atoi(argv[3]); int64_t max= (1<<(8*len))-1; int shift= argc<5 ? 0 : atoi(argv[4]); int skip_bytes = argc<6 ? 0 : atoi(argv[5]); int size0=0; int size1=0; int maxdist = 0; if(argc<3){ printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\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 (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++){ int64_t a= buf[0][j]; int64_t b= buf[1][j]; int dist; if(len==2){ a= (int16_t)(a | (buf[0][++j]<<8)); b= (int16_t)(b | (buf[1][ j]<<8)); } sse += (a-b) * (a-b); dist = abs(a-b); if (dist > maxdist) maxdist = dist; } size0 += s0; size1 += s1; if(s0+s1<=0) break; } i= FFMIN(size0,size1)/len; if(!i) i=1; 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:%5d bytes:%9d/%9d\n", (int)(dev/F), (int)(dev%F), (int)(psnr/F), (int)(psnr%F), maxdist, size0, size1); return 0; }