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diff --git a/portaudio/qa/loopback/src/write_wav.h b/portaudio/qa/loopback/src/write_wav.h
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+/*
+ * PortAudio Portable Real-Time Audio Library
+ * Latest Version at: http://www.portaudio.com
+ *
+ * Copyright (c) 1999-2010 Phil Burk and Ross Bencina
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ */
+#ifndef _WAV_WRITER_H
+#define _WAV_WRITER_H
+
+/*
+ * WAV file writer.
+ *
+ * Author: Phil Burk
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Define WAV Chunk and FORM types as 4 byte integers. */
+#define RIFF_ID   (('R'<<24) | ('I'<<16) | ('F'<<8) | 'F')
+#define WAVE_ID   (('W'<<24) | ('A'<<16) | ('V'<<8) | 'E')
+#define FMT_ID    (('f'<<24) | ('m'<<16) | ('t'<<8) | ' ')
+#define DATA_ID   (('d'<<24) | ('a'<<16) | ('t'<<8) | 'a')
+#define FACT_ID   (('f'<<24) | ('a'<<16) | ('c'<<8) | 't')
+
+/* Errors returned by Audio_ParseSampleImage_WAV */
+#define WAV_ERR_CHUNK_SIZE     (-1)   /* Chunk size is illegal or past file size. */
+#define WAV_ERR_FILE_TYPE      (-2)   /* Not a WAV file. */
+#define WAV_ERR_ILLEGAL_VALUE  (-3)   /* Illegal or unsupported value. Eg. 927 bits/sample */
+#define WAV_ERR_FORMAT_TYPE    (-4)   /* Unsupported format, eg. compressed. */
+#define WAV_ERR_TRUNCATED      (-5)   /* End of file missing. */
+
+/* WAV PCM data format ID */
+#define WAVE_FORMAT_PCM        (1)
+#define WAVE_FORMAT_IMA_ADPCM  (0x0011)
+
+
+typedef struct WAV_Writer_s
+{
+    FILE *fid;
+    /* Offset in file for data size. */
+    int   dataSizeOffset;
+    int   dataSize;
+} WAV_Writer;
+
+/*********************************************************************************
+ * Open named file and write WAV header to the file.
+ * The header includes the DATA chunk type and size.
+ * Returns number of bytes written to file or negative error code.
+ */
+long Audio_WAV_OpenWriter( WAV_Writer *writer, const char *fileName, int frameRate, int samplesPerFrame );
+
+/*********************************************************************************
+ * Write to the data chunk portion of a WAV file.
+ * Returns bytes written or negative error code.
+ */
+long Audio_WAV_WriteShorts( WAV_Writer *writer,
+        short *samples,
+        int numSamples
+        );
+
+/*********************************************************************************
+ * Close WAV file.
+ * Update chunk sizes so it can be read by audio applications.
+ */
+long Audio_WAV_CloseWriter( WAV_Writer *writer );
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /* _WAV_WRITER_H */