diff --git a/src/soundblaster.c b/src/soundblaster.c
index 8950b1a..67ee174 100644
--- a/src/soundblaster.c
+++ b/src/soundblaster.c
@@ -57,7 +57,7 @@
 
 
 // DMA
-#define DMA_DIRECTION_READ_FROM_MEMORY 0x04
+#define DMA_DIRECTION_READ_FROM_MEMORY 0x08
 #define DMA_TRANSFER_MODE_BLOCK        0x80
 
 
diff --git a/src/wav.h b/src/wav.h
new file mode 100644
index 0000000..86dc202
--- /dev/null
+++ b/src/wav.h
@@ -0,0 +1,36 @@
+/** 
+ * Copyright (c) 2015 rxi
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MIT license. See LICENSE for details.
+ */
+
+
+#ifndef WAV_H
+#define WAV_H
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef struct {
+  const void *data;
+  int bitdepth;
+  int samplerate;
+  int channels;
+  size_t length;
+} wav_t;
+
+enum {
+  WAV_ESUCCESS    =  0,
+  WAV_EFAILURE    = -1,
+  WAV_EBADHEADER  = -2,
+  WAV_EBADFMT     = -3,
+  WAV_ENOFMT      = -4,
+  WAV_ENODATA     = -5,
+  WAV_ENOSUPPORT  = -6
+};
+
+int wav_read(wav_t *w, const void *data, size_t len);
+const char *wav_strerror(int err);
+
+#endif