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+/*
+ * Internal interfaces for PortAudio Apple AUHAL implementation
+ *
+ * PortAudio Portable Real-Time Audio Library
+ * Latest Version at: http://www.portaudio.com
+ *
+ * Written by Bjorn Roche of XO Audio LLC, from PA skeleton code.
+ * Portions copied from code by Dominic Mazzoni (who wrote a HAL implementation)
+ *
+ * Dominic's code was based on code by Phil Burk, Darren Gibbs,
+ * Gord Peters, Stephane Letz, and Greg Pfiel.
+ *
+ * The following people also deserve acknowledgements:
+ *
+ * Olivier Tristan for feedback and testing
+ * Glenn Zelniker and Z-Systems engineering for sponsoring the Blocking I/O
+ * interface.
+ * 
+ *
+ * Based on the Open Source API proposed by Ross Bencina
+ * Copyright (c) 1999-2002 Ross Bencina, 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 pa_mac_core
+ @ingroup hostapi_src
+ @author Bjorn Roche
+ @brief AUHAL implementation of PortAudio
+*/
+
+#ifndef PA_MAC_CORE_INTERNAL_H__
+#define PA_MAC_CORE_INTERNAL_H__
+
+#include <AudioUnit/AudioUnit.h>
+#include <AudioToolbox/AudioToolbox.h>
+
+
+#include "portaudio.h"
+#include "pa_util.h"
+#include "pa_hostapi.h"
+#include "pa_stream.h"
+#include "pa_allocation.h"
+#include "pa_cpuload.h"
+#include "pa_process.h"
+#include "pa_ringbuffer.h"
+
+#include "pa_mac_core_blocking.h"
+
+/* function prototypes */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+PaError PaMacCore_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex index );
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#define RING_BUFFER_ADVANCE_DENOMINATOR (4)
+
+PaError ReadStream( PaStream* stream, void *buffer, unsigned long frames );
+PaError WriteStream( PaStream* stream, const void *buffer, unsigned long frames );
+signed long GetStreamReadAvailable( PaStream* stream );
+signed long GetStreamWriteAvailable( PaStream* stream );
+/* PaMacAUHAL - host api datastructure specific to this implementation */
+typedef struct
+{
+    PaUtilHostApiRepresentation inheritedHostApiRep;
+    PaUtilStreamInterface callbackStreamInterface;
+    PaUtilStreamInterface blockingStreamInterface;
+
+    PaUtilAllocationGroup *allocations;
+
+    /* implementation specific data goes here */
+    long devCount;
+    AudioDeviceID *devIds; /*array of all audio devices*/
+    AudioDeviceID defaultIn;
+    AudioDeviceID defaultOut;
+}
+PaMacAUHAL;
+
+
+
+/* stream data structure specifically for this implementation */
+typedef struct PaMacCoreStream
+{
+    PaUtilStreamRepresentation streamRepresentation;
+    PaUtilCpuLoadMeasurer cpuLoadMeasurer;
+    PaUtilBufferProcessor bufferProcessor;
+
+    /* implementation specific data goes here */
+    bool bufferProcessorIsInitialized;
+    AudioUnit inputUnit;
+    AudioUnit outputUnit;
+    AudioDeviceID inputDevice;
+    AudioDeviceID outputDevice;
+    size_t userInChan;
+    size_t userOutChan;
+    size_t inputFramesPerBuffer;
+    size_t outputFramesPerBuffer;
+    PaMacBlio blio;
+    /* We use this ring buffer when input and out devs are different. */
+    PaUtilRingBuffer inputRingBuffer;
+    /* We may need to do SR conversion on input. */
+    AudioConverterRef inputSRConverter;
+    /* We need to preallocate an inputBuffer for reading data. */
+    AudioBufferList inputAudioBufferList;
+    AudioTimeStamp startTime;
+    volatile PaStreamCallbackFlags xrunFlags;
+    volatile bool isTimeSet;
+    volatile enum {
+       STOPPED          = 0, /* playback is completely stopped,
+                                and the user has called StopStream(). */
+       CALLBACK_STOPPED = 1, /* callback has requested stop,
+                                but user has not yet called StopStream(). */
+       STOPPING         = 2, /* The stream is in the process of closing.
+                                This state is just used internally;
+                                externally it is indistinguishable from
+                                ACTIVE.*/
+       ACTIVE           = 3  /* The stream is active and running. */
+    } state;
+    double sampleRate;
+    //these may be different from the stream sample rate due to SR conversion:
+    double outDeviceSampleRate;
+    double inDeviceSampleRate;
+}
+PaMacCoreStream;
+
+#endif /* PA_MAC_CORE_INTERNAL_H__ */