From f61e9d2bd73d3e6735fafe678b6f8f7b9eef2ae1 Mon Sep 17 00:00:00 2001
From: Michael Ossmann <mike@ossmann.com>
Date: Sun, 16 Mar 2014 10:31:17 -0600
Subject: [PATCH] write unsigned chars to .wav file instead of signed chars

---
 host/hackrf-tools/src/hackrf_transfer.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/host/hackrf-tools/src/hackrf_transfer.c b/host/hackrf-tools/src/hackrf_transfer.c
index bf32d182..6441aae1 100644
--- a/host/hackrf-tools/src/hackrf_transfer.c
+++ b/host/hackrf-tools/src/hackrf_transfer.c
@@ -334,6 +334,7 @@ uint32_t baseband_filter_bw_hz = 0;
 
 int rx_callback(hackrf_transfer* transfer) {
 	size_t bytes_to_write;
+	int i;
 
 	if( fd != NULL ) 
 	{
@@ -346,6 +347,12 @@ int rx_callback(hackrf_transfer* transfer) {
 			}
 			bytes_to_xfer -= bytes_to_write;
 		}
+		if (receive_wav) {
+			/* convert .wav contents from signed to unsigned */
+			for (i = 0; i < bytes_to_write; i++) {
+				*(transfer->buffer + i) ^= (uint8_t)0x80;
+			}
+		}
 		bytes_written = fwrite(transfer->buffer, 1, bytes_to_write, fd);
 		if ((bytes_written != bytes_to_write)
 				|| (limit_num_samples && (bytes_to_xfer == 0))) {