Introduce mp3 compression step before speed change for speed tests.

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

src/ber-test.sh

@@ -71,6 +71,13 @@ do
       TEST_CUT_ARGS=""
     fi
     if [ "x$AWM_SPEED" != x ]; then
+      if [ "x$AWM_SPEED_PRE_MP3" != x ]; then
+        # first (optional) mp3 step: simulate quality loss before speed change
+        lame -b "$AWM_SPEED_PRE_MP3" ${AWM_FILE}.wav ${AWM_FILE}.mp3 --quiet
+        rm ${AWM_FILE}.wav
+        ffmpeg -i ${AWM_FILE}.mp3 ${AWM_FILE}.wav -v quiet -nostdin
+      fi
+
       [ -z $SPEED_SEED ] && SPEED_SEED=0
       SPEED=$(audiowmark test-speed $SPEED_SEED --test-key $SEED)
       ((SPEED_SEED++))

src/gen-speed-mk.sh

@@ -32,14 +32,14 @@ do
     do
       FILE="speed-$CLIP-$STRENGTH-$SEED"
       echo "$FILE:"
-      echo -e "\t( cd ..; AWM_RAND_PATTERN=1 AWM_SET=huge2 AWM_PARAMS='--strength $STRENGTH' AWM_SPEED=1 AWM_CLIP='$CLIP' AWM_SEEDS=$SEED AWM_FILE='t-$FILE' ber-test.sh mp3 128 ) >x$FILE"
+      echo -e "\t( cd ..; AWM_RAND_PATTERN=1 AWM_SET=huge2 AWM_PARAMS='--strength $STRENGTH' AWM_SPEED=1 AWM_SPEED_PRE_MP3=128 AWM_CLIP='$CLIP' AWM_SEEDS=$SEED AWM_FILE='t-$FILE' ber-test.sh mp3 128 ) >x$FILE"
       echo -e "\tmv x$FILE $FILE"
       echo
     done
     # full file
     FILE="speed-full-$STRENGTH-$SEED"
     echo "$FILE:"
-    echo -e "\t( cd ..; AWM_RAND_PATTERN=1 AWM_SET=huge2 AWM_PARAMS='--strength $STRENGTH' AWM_SPEED=1 AWM_SEEDS=$SEED AWM_FILE='t-$FILE' ber-test.sh mp3 128 ) >x$FILE"
+    echo -e "\t( cd ..; AWM_RAND_PATTERN=1 AWM_SET=huge2 AWM_PARAMS='--strength $STRENGTH' AWM_SPEED=1 AWM_SPEED_PRE_MP3=128 AWM_SEEDS=$SEED AWM_FILE='t-$FILE' ber-test.sh mp3 128 ) >x$FILE"
     echo -e "\tmv x$FILE $FILE"
     echo
   done