pcm/Export: rename CalcSourceSize() to CalcInputSize()

src/output/plugins/AlsaOutputPlugin.cxx

@@ -884,7 +884,7 @@ AlsaOutput::Play(const void *chunk, size_t size)
 		size_t bytes_written = ring_buffer->push((const uint8_t *)e.data,
 							 e.size);
 		if (bytes_written > 0)
-			return pcm_export->CalcSourceSize(bytes_written);
+			return pcm_export->CalcInputSize(bytes_written);
 
 		/* now that the ring_buffer is full, we can activate
 		   the socket handlers to trigger the first

src/output/plugins/OSXOutputPlugin.cxx

@@ -890,7 +890,7 @@ OSXOutput::Play(const void *chunk, size_t size)
 			return size;
 
 		size_t bytes_written = ring_buffer->push((const uint8_t *)e.data, e.size);
-		return pcm_export->CalcSourceSize(bytes_written);
+		return pcm_export->CalcInputSize(bytes_written);
 	}
 #endif
 	return ring_buffer->push((const uint8_t *)chunk, size);

src/output/plugins/OssOutputPlugin.cxx

@@ -681,7 +681,7 @@ OssOutput::Play(const void *chunk, size_t size)
 		ret = fd.Write(chunk, size);
 		if (ret > 0) {
 #ifdef AFMT_S24_PACKED
-			ret = pcm_export->CalcSourceSize(ret);
+			ret = pcm_export->CalcInputSize(ret);
 #endif
 			return ret;
 		}

src/pcm/Export.cxx

@@ -266,7 +266,7 @@ PcmExport::Export(ConstBuffer<void> data) noexcept
 }
 
 size_t
-PcmExport::CalcSourceSize(size_t size) const noexcept
+PcmExport::CalcInputSize(size_t size) const noexcept
 {
 	if (pack24)
 		/* 32 bit to 24 bit conversion (4 to 3 bytes) */

src/pcm/Export.hxx

@@ -205,7 +205,7 @@ public:
 	 * pcm_export() source buffer.
 	 */
 	gcc_pure
-	size_t CalcSourceSize(size_t dest_size) const noexcept;
+	size_t CalcInputSize(size_t dest_size) const noexcept;
 };
 
 #endif