new util: countquant for 2pass statsfiles

git-svn-id: svn://svn.videolan.org/x264/trunk@186 df754926-b1dd-0310-bc7b-ec298dee348c

tools/countquant_x264.pl

+#!/usr/bin/env perl
+# countquant_x264.pl: displays statistics from x264 multipass logfiles
+# by Loren Merritt, 2005-4-5
+
+@size{I,P,B} =
+@n{I,P,B} = (0)x3;
+
+sub proc_file {
+    my $fh = shift;
+    while(<$fh>) {
+        /type:(.) q:(\d+\.\d+) itex:(\d+) ptex:(\d+) mv:(\d+) misc:(\d+)/ or next;
+	$type = uc $1;
+	$n{$type} ++;
+	$q[int($2+.5)] ++;
+	$avgq += $2;
+	$avgq{$type} += $2;
+        my $bytes = ($3+$4+$5+$6)/8;
+	$size{$type} += $bytes;
+    }
+    $size = $size{I} + $size{P} + $size{B};
+    $n = $n{I} + $n{P} + $n{B};
+    $n or die "unrecognized input\n";
+}
+
+if(@ARGV) {
+    foreach(@ARGV) {
+        open $fh, "<", $_ or die "can't open '$_': $!";
+	proc_file($fh);
+    }
+} else {
+    proc_file(STDIN);
+}
+
+for(0..51) {
+    $q[$_] or next;
+    printf "q%2d: %6d  %4.1f%%\n", $_, $q[$_], 100*$q[$_]/$n;
+}
+print "\n";
+$digits = int(log($n+1)/log(10))+2;
+printf "All: %${digits}d        %s  avgQP:%5.2f  avgBytes:%5d\n",
+    $n, $n==$n{I}?" ":"", $avgq/$n, $size/$n;
+foreach(qw(I P B S)) {
+    $n{$_} or next;
+    printf "%s:   %${digits}d (%4.1f%%)  avgQP:%5.2f  avgBytes:%5d\n",
+        $_, $n{$_}, 100*$n{$_}/$n, $avgq{$_}/$n{$_}, $size{$_}/$n{$_};
+}
+print "\n";
+printf "total size: $size B = %.2f KiB = %.2f MiB\n",
+    $size/2**10, $size/2**20;
+print "bitrate: ", join("\n       = ",
+    map sprintf("%.2f kbps @ %s fps", $_*$size*8/1000/$n, $_),
+    23.976, 25, 29.97), "\n";