check quality too, not only md5 (but dont take the scores too serious, the different codecs use different quality/bitrates and its just based on a artificially generated testvideo)

small changes to some test to check a broader area of features

Originally committed as revision 1751 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/tiny_psnr.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#define F 100
+#define SIZE 2048
+
+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];
+    
+    if(argc!=3){
+        printf("tiny_psnr <file1> <file2>\n");
+        return -1;
+    }
+    
+    f[0]= fopen(argv[1], "r");
+    f[1]= fopen(argv[2], "r");
+
+    for(i=0;;){
+        if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
+        if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
+        
+        for(j=0; j<SIZE; i++,j++){
+            const int a= buf[0][j];
+            const int b= buf[1][j];
+            sse += (a-b) * (a-b);
+        }
+    }
+    
+    dev= int_sqrt((sse*F*F)/i);
+    
+    //FIXME someone should write a integer fixpoint log() function for bitexact PSNR scores ...
+    printf("stddev:%3d.%02d bytes:%d\n", (int)(dev/F), (int)(dev%F), i);
+    
+    return 0;
+}