From 1e90317b655699a2877478e335e998fb5e4b79d8 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 24 Jul 2008 17:24:36 +0000
Subject: Fix tiny_psnr so it compares all bytes (it did skip the last block).
 Also display both file sizes and slightly change the output formatting. [not
 split in 3 patches to avoid the huge checksum files from being changed  and
 having to be reviewed 3 times, if people want it split i can revert and 
 split it]

Originally committed as revision 14374 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 tests/tiny_psnr.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

(limited to 'tests/tiny_psnr.c')

diff --git a/tests/tiny_psnr.c b/tests/tiny_psnr.c
index b7b1d0848f..6327e6f9e4 100644
--- a/tests/tiny_psnr.c
+++ b/tests/tiny_psnr.c
@@ -23,6 +23,7 @@
 #include <inttypes.h>
 #include <assert.h>
 
+#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
 #define F 100
 #define SIZE 2048
 
@@ -110,6 +111,8 @@ int main(int argc,char* argv[]){
     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");
@@ -129,11 +132,11 @@ int main(int argc,char* argv[]){
     fseek(f[0],skip_bytes,SEEK_CUR);
     fseek(f[1],skip_bytes,SEEK_CUR);
 
-    for(i=0;;){
-        if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
-        if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
+    for(;;){
+        int s0= fread(buf[0], 1, SIZE, f[0]);
+        int s1= fread(buf[1], 1, SIZE, f[1]);
 
-        for(j=0; j<SIZE; i++,j++){
+        for(j=0; j<FFMIN(s0,s1); j++){
             int64_t a= buf[0][j];
             int64_t b= buf[1][j];
             if(len==2){
@@ -142,19 +145,24 @@ int main(int argc,char* argv[]){
             }
             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= 100*F-1; //floating point free infinity :)
+        psnr= 1000*F-1; //floating point free infinity :)
 
-    printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n",
+    printf("stddev:%5d.%02d PSNR:%3d.%02d bytes:%9d/%9d\n",
         (int)(dev/F), (int)(dev%F),
         (int)(psnr/F), (int)(psnr%F),
-        i*len);
+        size0, size1);
     return 0;
 }
 
-- 
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