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-rw-r--r--src/pcm/PcmDither.cxx13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/pcm/PcmDither.cxx b/src/pcm/PcmDither.cxx
index f07d0b343..d9d4d28ca 100644
--- a/src/pcm/PcmDither.cxx
+++ b/src/pcm/PcmDither.cxx
@@ -62,6 +62,19 @@ PcmDither::Dither(T sample)
return output >> scale_bits;
}
+template<typename ST, unsigned SBITS, unsigned DBITS>
+inline ST
+PcmDither::DitherShift(ST sample)
+{
+ static_assert(sizeof(ST) * 8 > SBITS, "Source type too small");
+ static_assert(SBITS > DBITS, "Non-positive scale_bits");
+
+ static constexpr ST MIN = -(ST(1) << (SBITS - 1));
+ static constexpr ST MAX = (ST(1) << (SBITS - 1)) - 1;
+
+ return Dither<ST, MIN, MAX, SBITS - DBITS>(sample);
+}
+
template<typename ST, typename DT>
inline typename DT::value_type
PcmDither::DitherConvert(typename ST::value_type sample)