fix stream class

[ffmpeg] / tests / tiny_psnr.c

diff --git a/tests/tiny_psnr.c b/tests/tiny_psnr.c
index 2104dd47266f961d9b3080e22577be36a67b374f..05f3d4f267804e578f3528e3ecd125fa62881202 100644 (file)
--- a/tests/tiny_psnr.c
+++ b/tests/tiny_psnr.c
@@ -18,11 +18,68 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <inttypes.h>
+#include <assert.h>
 
 #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 1
+// 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;
+}
+// 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;
+}
+
+#endif
 static uint64_t int_sqrt(uint64_t a)
 {
     uint64_t ret=0;
@@ -45,30 +102,47 @@ int main(int argc,char* argv[]){
     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]);
     
-    if(argc!=3){
-        printf("tiny_psnr <file1> <file2>\n");
+    if(argc<3){
+        printf("tiny_psnr <file1> <file2> [<elem size> [<shift>]]\n");
         return -1;
     }
     
-    f[0]= fopen(argv[1], "r");
-    f[1]= fopen(argv[2], "r");
+    f[0]= fopen(argv[1], "rb");
+    f[1]= fopen(argv[2], "rb");
+    fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
 
     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];
+            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);
         }
     }
     
-    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);
+    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 :)
     
+    printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n", 
+        (int)(dev/F), (int)(dev%F), 
+        (int)(psnr/F), (int)(psnr%F),
+        i);
     return 0;
 }
+
+