PcmConvert: Convert() returns ConstBuffer

src/pcm/PcmConvert.cxx

@@ -117,12 +117,9 @@ PcmConvert::Close()
 #endif
 }
 
-const void *
-PcmConvert::Convert(const void *src, size_t src_size,
-		    size_t *dest_size_r,
-		    Error &error)
+ConstBuffer<void>
+PcmConvert::Convert(ConstBuffer<void> buffer, Error &error)
 {
-	ConstBuffer<void> buffer(src, src_size);
 	AudioFormat format = src_format;
 
 	if (format.format == SampleFormat::DSD) {
@@ -164,6 +161,5 @@ PcmConvert::Convert(const void *src, size_t src_size,
 		format.channels = dest_format.channels;
 	}
 
-	*dest_size_r = buffer.size;
-	return buffer.data;
+	return buffer;
 }

src/pcm/PcmConvert.hxx

@@ -70,16 +70,12 @@ public:
 	 *
 	 * @param src_format the source audio format
 	 * @param src the source PCM buffer
-	 * @param src_size the size of #src in bytes
 	 * @param dest_format the requested destination audio format
-	 * @param dest_size_r returns the number of bytes of the destination buffer
 	 * @param error_r location to store the error occurring, or nullptr to
 	 * ignore errors
 	 * @return the destination buffer, or nullptr on error
 	 */
-	const void *Convert(const void *src, size_t src_size,
-			    size_t *dest_size_r,
-			    Error &error);
+	ConstBuffer<void> Convert(ConstBuffer<void> src, Error &error);
 };
 
 bool