pcm: --disable-dsd also disables the dsd2pcm library

src/pcm/PcmConvert.cxx

@@ -109,7 +109,9 @@ PcmConvert::Close()
 	if (enable_resampler)
 		resampler.Close();
 
+#ifdef ENABLE_DSD
 	dsd.Reset();
+#endif
 
 #ifndef NDEBUG
 	src_format.Clear();
@@ -120,6 +122,7 @@ PcmConvert::Close()
 ConstBuffer<void>
 PcmConvert::Convert(ConstBuffer<void> buffer, Error &error)
 {
+#ifdef ENABLE_DSD
 	if (src_format.format == SampleFormat::DSD) {
 		auto s = ConstBuffer<uint8_t>::FromVoid(buffer);
 		auto d = dsd.ToFloat(src_format.channels, s);
@@ -131,6 +134,7 @@ PcmConvert::Convert(ConstBuffer<void> buffer, Error &error)
 
 		buffer = d.ToVoid();
 	}
+#endif
 
 	if (enable_resampler) {
 		buffer = resampler.Resample(buffer, error);

src/pcm/PcmConvert.hxx

@@ -20,13 +20,17 @@
 #ifndef PCM_CONVERT_HXX
 #define PCM_CONVERT_HXX
 
-#include "PcmDsd.hxx"
+#include "check.h"
 #include "PcmBuffer.hxx"
 #include "FormatConverter.hxx"
 #include "ChannelsConverter.hxx"
 #include "GlueResampler.hxx"
 #include "AudioFormat.hxx"
 
+#ifdef ENABLE_DSD
+#include "PcmDsd.hxx"
+#endif
+
 #include <stddef.h>
 
 template<typename T> struct ConstBuffer;
@@ -39,7 +43,9 @@ class Domain;
  * conversions.
  */
 class PcmConvert {
+#ifdef ENABLE_DSD
 	PcmDsd dsd;
+#endif
 
 	GluePcmResampler resampler;
 	PcmFormatConverter format_converter;