Add mp3 quality comparision for different mp3 quality levels.

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

src/gen-mp3q-clip.sh

+#!/bin/bash
+
+SEEDS=$(seq 5)
+STRENGTHS="10 15"
+MP3_QUALITIES="128 64 48"
+MULTI_CLIP=4
+
+if [ "x$1" == "xmk" ]; then
+  echo -n "all:"
+
+  for STRENGTH in $STRENGTHS
+  do
+    FILE="snr-$STRENGTH"
+    echo -n " $FILE"
+  done
+
+  for SEED in $SEEDS
+  do
+    for STRENGTH in $STRENGTHS
+    do
+      for Q in $MP3_QUALITIES
+      do
+        FILE="mp3-$Q-$STRENGTH-$SEED"
+        echo -n " $FILE"
+      done
+    done
+  done
+
+  echo
+  echo
+
+  for STRENGTH in $STRENGTHS
+  do
+    FILE="snr-$STRENGTH"
+    echo "$FILE:"
+    echo -e "\t( cd ..; AWM_SET=huge2 AWM_PARAMS='--strength $STRENGTH' snr.sh ) >x$FILE"
+    echo -e "\tmv x$FILE $FILE"
+    echo
+  done
+
+  for SEED in $SEEDS
+  do
+    for STRENGTH in $STRENGTHS
+    do
+      for Q in $MP3_QUALITIES
+      do
+        FILE="mp3-$Q-$STRENGTH-$SEED"
+        echo "$FILE:"
+        echo -e "\t( cd ..; AWM_RAND_PATTERN=1 AWM_SET=huge2 AWM_CLIP='50' AWM_PARAMS_ADD='--strength $STRENGTH' AWM_MULTI_CLIP='$MULTI_CLIP' AWM_SEEDS=$SEED AWM_FILE='t-$FILE' ber-test.sh mp3 $Q ) >x$FILE"
+        echo -e "\tmv x$FILE $FILE"
+        echo
+      done
+    done
+  done
+fi
+
+if [ "x$1" == "xadoc" ]; then
+  echo '[frame="topbot",options="header",cols="<1,4*<"]'
+  echo '|=========================='
+  echo '| *Strength* | *SNR* | *mp3 128kbit/s* | *mp3 64kbit/s* | *mp3 48kbit/s*'
+
+  for STRENGTH in $STRENGTHS
+  do
+    echo -n "| *$STRENGTH* "
+    cat snr-$STRENGTH | awk '{printf ("| %.2f ", $1);}'
+    for Q in $MP3_QUALITIES
+    do
+      for FILE in "mp3-$Q-$STRENGTH-*"
+      do
+        cat $FILE
+      done | grep -v '#' | awk '{bad += $1; n += $2} END {if (n==0) n=1;fer=100.0*bad/n; bold=fer>0?"*":" ";printf ("| %s%.2f%s", bold, fer, bold)}'
+    done
+    echo
+  done
+
+  echo '|=========================='
+fi