| /* |
| * 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 <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; |
| |
| if(argc<3){ |
| printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n"); |
| printf("For WAV files use the following:\n"); |
| printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\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; |
| } |
| fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET); |
| |
| 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]; |
| if(len==2){ |
| a= (int16_t)(a | (buf[0][++j]<<8)); |
| b= (int16_t)(b | (buf[1][ j]<<8)); |
| } |
| sse += (a-b) * (a-b); |
| } |
| 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 + (1<<31)) / (1LL<<32); |
| else |
| psnr= 1000*F-1; //floating point free infinity :) |
| |
| printf("stddev:%5d.%02d PSNR:%3d.%02d bytes:%9d/%9d\n", |
| (int)(dev/F), (int)(dev%F), |
| (int)(psnr/F), (int)(psnr%F), |
| size0, size1); |
| return 0; |
| } |
| |
| |