remove sws_flags, seems to have no effect

[ffmpeg] / tests / tiny_psnr.c

diff --git a/tests/tiny_psnr.c b/tests/tiny_psnr.c
index 2104dd47266f961d9b3080e22577be36a67b374f..6327e6f9e4d90598bd54ec36deb4116f3f0013b0 100644 (file)
--- a/tests/tiny_psnr.c
+++ b/tests/tiny_psnr.c
@@ -1,28 +1,89 @@
 /*
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
+ * 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;
@@ -45,30 +106,64 @@ int main(int argc,char* argv[]){
     uint64_t dev;
     FILE *f[2];
     uint8_t buf[2][SIZE];
-    
-    if(argc!=3){
-        printf("tiny_psnr <file1> <file2>\n");
+    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;
     }
-    
-    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];
+    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;
     }
-    
-    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);
-    
+
+    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;
 }
+
+