pcm/Dop: add separate dsd_buffer for DSD_U16/32

src/pcm/Export.cxx

@@ -158,12 +158,12 @@ PcmExport::Export(ConstBuffer<void> data) noexcept
 
 #ifdef ENABLE_DSD
 	if (dsd_u16)
-		data = Dsd8To16(dop_buffer, channels,
+		data = Dsd8To16(dsd_buffer, channels,
 				ConstBuffer<uint8_t>::FromVoid(data))
 			.ToVoid();
 
 	if (dsd_u32)
-		data = Dsd8To32(dop_buffer, channels,
+		data = Dsd8To32(dsd_buffer, channels,
 				ConstBuffer<uint8_t>::FromVoid(data))
 			.ToVoid();
 

src/pcm/Export.hxx

@@ -42,6 +42,13 @@ class PcmExport {
 
 #ifdef ENABLE_DSD
 	/**
+	 * The buffer is used to convert DSD samples to DSD_U16 or DSD_U32.
+	 *
+	 * @see #dsd_u16, #dsd_u32
+	 */
+	PcmBuffer dsd_buffer;
+
+	/**
 	 * The buffer is used to convert DSD samples to the
 	 * DoP format.
 	 *