Add patch from Earl Chew <earl_chew@yahoo.com> that adds testing for

the replay gain calculations.

diff --git a/test/test_metaflac.sh b/test/test_metaflac.sh
index 19f5a00..c823ccf 100755 (executable)
--- a/test/test_metaflac.sh
+++ b/test/test_metaflac.sh
@@ -392,6 +392,93 @@ run_metaflac --remove --block-type=VORBIS_COMMENT --dont-use-padding $flacfile
 cmp $flacfile metaflac.flac.ok || die "ERROR, $flacfile and metaflac.flac.ok differ"
 echo OK
 
+# Replay gain tests - Test the rates which have specific filter table entries
+# and verify that harmonics can be processed correctly.
+
+tonegenerator ()
+{
+    awk -- '
+    BEGIN {
+            samplerate = '$1';
+
+            tone = 1000;
+            duration = 1;
+            bitspersample = 24;
+
+            samplemidpoint = lshift(1, (bitspersample-1));
+            samplerange = samplemidpoint - 1;
+
+            pi = 4 * atan2(1,1);
+
+            for (ix = 0; ix < duration * samplerate; ++ix) {
+                    sample = sin(2 * pi * tone * ix / samplerate);
+                    sample *= samplerange;
+                    sample += samplemidpoint;
+                    sample = int(sample);
+                    for (bx = 0; bx < bitspersample/8; ++bx) {
+                            byte[bx] = sample % 256;
+                            sample /= 256;
+                    }
+                    while (bx--) {
+                            printf("%c", byte[bx]);
+                    }
+            }
+
+    }' /dev/null |
+    flac --silent \
+        --endian=big --channels=1 --bps=24 --sample-rate=$1 --sign=unsigned -
+}
+
+REPLAYGAIN_FREQ=
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ  8000/-12.73"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 11025/-12.93"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 11025/-12.93"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 12000/-12.98"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 16000/-13.27"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 18900/-13.41"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 22050/-13.77"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 24000/-13.82"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 28000/-14.06"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 32000/-14.08"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 36000/-14.12"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 37800/-14.18"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 44100/-14.17"
+REPLAYGAIN_FREQ="$REPLAYGAIN_FREQ 48000/-14.16:1:2:4"
+
+for ACTION in $REPLAYGAIN_FREQ ; do
+  if [ -n "${ACTION##*:*}" ] ; then
+    HARMONICS=1
+  else
+    HARMONICS="${ACTION#*:}"
+  fi
+  FREQ="${ACTION%%/*}"
+  GAIN="${ACTION#*/}"
+  GAIN="${GAIN%%:*}"
+  while [ -n "$HARMONICS" ] ; do
+    MULTIPLE="${HARMONICS%%:*}"
+    if [ x"$MULTIPLE" = x"$HARMONICS" ] ; then
+      HARMONICS=
+    else
+      HARMONICS="${HARMONICS#*:}"
+    fi
+    RATE=$(($MULTIPLE * FREQ))
+    [ $MULTIPLE -eq 1 -o -n "${REPLAYGAIN_FREQ##* $RATE/*}" ] || break
+    echo -n "Testing FLAC replaygain $RATE ($FREQ x $MULTIPLE) ... "
+    tonegenerator $RATE > $flacfile
+    run_metaflac --add-replay-gain $flacfile
+    run_metaflac --list $flacfile | grep REPLAYGAIN.*GAIN= |
+    while read -r REPLAYGAIN ; do
+      MEASUREDGAIN="${REPLAYGAIN##*=}"
+      MEASUREDGAIN="${MEASUREDGAIN%% *}"
+      if [ x"$MEASUREDGAIN" != x"$GAIN" ] ; then
+        die "ERROR, Expected $GAIN db instead of $REPLAYGAIN"
+      fi
+    done
+    echo OK
+  done
+done
+
+
 rm -f $testdir/out.flac $testdir/out.meta
 
 exit 0