Mp3 bitrate to error rate test.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/ber-mp3.sh

+#/bin/bash
+
+echo 512 $(ber-test.sh)
+for quality in 256 196 128 96 64
+do
+  echo $quality $(ber-test.sh mp3 $quality)
+done