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diff --git a/portaudio/include/pa_linux_alsa.h b/portaudio/include/pa_linux_alsa.h
new file mode 100644
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+++ b/portaudio/include/pa_linux_alsa.h
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+#ifndef PA_LINUX_ALSA_H
+#define PA_LINUX_ALSA_H
+
+/*
+ * $Id$
+ * PortAudio Portable Real-Time Audio Library
+ * ALSA-specific extensions
+ *
+ * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
+ *
+ * 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.
+ */
+
+/** @file
+ *  @ingroup public_header
+ *  @brief ALSA-specific PortAudio API extension header file.
+ */
+
+#include "portaudio.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct PaAlsaStreamInfo
+{
+    unsigned long size;
+    PaHostApiTypeId hostApiType;
+    unsigned long version;
+
+    const char *deviceString;
+}
+PaAlsaStreamInfo;
+
+/** Initialize host API specific structure, call this before setting relevant attributes. */
+void PaAlsa_InitializeStreamInfo( PaAlsaStreamInfo *info );
+
+/** Instruct whether to enable real-time priority when starting the audio thread.
+ *
+ * If this is turned on by the stream is started, the audio callback thread will be created
+ * with the FIFO scheduling policy, which is suitable for realtime operation.
+ **/
+void PaAlsa_EnableRealtimeScheduling( PaStream *s, int enable );
+
+#if 0
+void PaAlsa_EnableWatchdog( PaStream *s, int enable );
+#endif
+
+/** Get the ALSA-lib card index of this stream's input device. */
+PaError PaAlsa_GetStreamInputCard( PaStream *s, int *card );
+
+/** Get the ALSA-lib card index of this stream's output device. */
+PaError PaAlsa_GetStreamOutputCard( PaStream *s, int *card );
+
+/** Set the number of periods (buffer fragments) to configure devices with.
+ *
+ * By default the number of periods is 4, this is the lowest number of periods that works well on
+ * the author's soundcard.
+ * @param numPeriods The number of periods.
+ */
+PaError PaAlsa_SetNumPeriods( int numPeriods );
+
+/** Set the maximum number of times to retry opening busy device (sleeping for a
+ * short interval inbetween).
+ */
+PaError PaAlsa_SetRetriesBusy( int retries );
+
+/** Set the path and name of ALSA library file if PortAudio is configured to load it dynamically (see
+ *  PA_ALSA_DYNAMIC). This setting will overwrite the default name set by PA_ALSA_PATHNAME define.
+ * @param pathName Full path with filename. Only filename can be used, but dlopen() will lookup default
+ *                 searchable directories (/usr/lib;/usr/local/lib) then.
+ */
+void PaAlsa_SetLibraryPathName( const char *pathName );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif