1 files changed, 21 insertions, 0 deletions
diff --git a/TOOLS/calcbpp.pl b/TOOLS/calcbpp.pl
new file mode 100755
index 0000000000..067434c1e1
--- /dev/null
+++ b/TOOLS/calcbpp.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/perl -w
+
+use POSIX;
+
+sub round {
+  my $v = shift;
+  
+  return floor($v + 0.5) != floor($v) ?
+    floor($v + 0.5) :
+    floor($v);
+}
+
+if (scalar(@ARGV) < 4) {
+  print("Please provide a) the cropped but unscaled resolution (e.g. " .
+        "716x524), b) the aspect ratio (either 4/3 or 16/9 for most DVDs), " .
+        "c) the video bitrate in kbps (e.g. 800) and d) the movie's fps.\n");
+  exit(1);
+}
+
+($unscaled_width, $unscaled_height) = split('x', $ARGV[0]);.$encoded_at = $ARGV[1];.if ($encoded_at =~ /\//) {.  my @a = split(/\//, $encoded_at);.  $encoded_at = $a[0] / $a[1];.}.$scaled_width = $unscaled_width * ($encoded_at / (5/4));.$scaled_height = $unscaled_height;.$picture_ar = $scaled_width / $scaled_height;.($bps, $fps) = @ARGV[2, 3];..printf("Prescaled picture: %dx%d, AR %.2f\n", $scaled_width, $scaled_height,.       $picture_ar);.for ($width = 720; $width >= 320; $width -= 16) {.  $height = 16 * round($width / $picture_ar / 16);.  $diff = round($width / $picture_ar - $height);.  $new_ar = $width / $height;.  $picture_ar_error = abs(100 - $picture_ar / $new_ar * 100);.  printf("${width}x${height}, diff % 3d, new AR %.2f, AR error %.2f%% " ..         "scale=%d:%d bpp: %.3f\n", $diff, $new_ar, $picture_ar_error, $width,.         $height, ($bps * 1000) / ($width * $height * $fps));.}.
+