# HG changeset patch
# User Chris Cannam
# Date 1382114407 -3600
# Node ID 12a0c2e493c4e26a3808d362542545901c0ab768
# Parent  7d4165ded830ebba78a3175d30ee9e8510eb2f4e
Two-stage decimate for factors not supported in a single stage

diff -r 7d4165ded830 -r 12a0c2e493c4 run-tests.sh
--- a/run-tests.sh	Fri Oct 18 17:15:54 2013 +0100
+++ b/run-tests.sh	Fri Oct 18 17:40:07 2013 +0100
@@ -46,11 +46,26 @@
     "$mydir/garage-resampler/resample" --snr 50 --bandwidth 0.05 --to "$(($original/$factor))" "$infile" "$outfile"
 }
 
+decimate_twice() {
+    first="$1"
+    second="$2"
+    infile="$3"
+    outfile="$4"
+    "$mydir/qm-dsp-decimate/decimate" --by "$first" "$infile" "$outfile".tmp
+    "$mydir/qm-dsp-decimate/decimate" --by "$second" "$outfile".tmp "$outfile"
+    rm "$outfile".tmp
+}    
+
 do_decimate() {
     factor="$1"
     infile="$2"
     outfile="$3"
-    "$mydir/qm-dsp-decimate/decimate" --by "$factor" "$infile" "$outfile"
+    case "$factor" in
+	16) decimate_twice 4 4 "$infile" "$outfile";;
+	32) decimate_twice 8 4 "$infile" "$outfile";;
+	64) decimate_twice 8 8 "$infile" "$outfile";;
+	*) "$mydir/qm-dsp-decimate/decimate" --by "$factor" "$infile" "$outfile";;
+    esac
 }
 
 mkdir -p "$mydir"/out