pa_mac_core_internal.h

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00001 /*
00002  * Implementation of the PortAudio API for Apple AUHAL
00003  *
00004  * PortAudio Portable Real-Time Audio Library
00005  * Latest Version at: http://www.portaudio.com
00006  *
00007  * Written by Bjorn Roche of XO Audio LLC, from PA skeleton code.
00008  * Portions copied from code by Dominic Mazzoni (who wrote a HAL implementation)
00009  *
00010  * Dominic's code was based on code by Phil Burk, Darren Gibbs,
00011  * Gord Peters, Stephane Letz, and Greg Pfiel.
00012  *
00013  * Bjorn Roche and XO Audio LLC reserve no rights to this code.
00014  * The maintainers of PortAudio may redistribute and modify the code and
00015  * licenses as they deam appropriate.
00016  *
00017  * The following people also deserve acknowledgements:
00018  *
00019  * Olivier Tristan for feedback and testing
00020  * Glenn Zelniker and Z-Systems engineering for sponsoring the Blocking I/O
00021  * interface.
00022  * 
00023  *
00024  * Based on the Open Source API proposed by Ross Bencina
00025  * Copyright (c) 1999-2002 Ross Bencina, Phil Burk
00026  *
00027  * Permission is hereby granted, free of charge, to any person obtaining
00028  * a copy of this software and associated documentation files
00029  * (the "Software"), to deal in the Software without restriction,
00030  * including without limitation the rights to use, copy, modify, merge,
00031  * publish, distribute, sublicense, and/or sell copies of the Software,
00032  * and to permit persons to whom the Software is furnished to do so,
00033  * subject to the following conditions:
00034  *
00035  * The above copyright notice and this permission notice shall be
00036  * included in all copies or substantial portions of the Software.
00037  *
00038  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00039  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00040  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00041  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
00042  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
00043  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00044  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00045  */
00046 
00047 /*
00048  * The text above constitutes the entire PortAudio license; however, 
00049  * the PortAudio community also makes the following non-binding requests:
00050  *
00051  * Any person wishing to distribute modifications to the Software is
00052  * requested to send the modifications to the original developer so that
00053  * they can be incorporated into the canonical version. It is also 
00054  * requested that these non-binding requests be included along with the 
00055  * license above.
00056  */
00057 
00064 #ifndef PA_MAC_CORE_INTERNAL_H__
00065 #define PA_MAC_CORE_INTERNAL_H__
00066 
00067 #include <AudioUnit/AudioUnit.h>
00068 #include <AudioToolbox/AudioToolbox.h>
00069 
00070 
00071 #include "portaudio.h"
00072 #include "pa_util.h"
00073 #include "pa_hostapi.h"
00074 #include "pa_stream.h"
00075 #include "pa_allocation.h"
00076 #include "pa_cpuload.h"
00077 #include "pa_process.h"
00078 #include "ringbuffer.h"
00079 
00080 #include "pa_mac_core_blocking.h"
00081 
00082 /* function prototypes */
00083 
00084 #ifdef __cplusplus
00085 extern "C"
00086 {
00087 #endif /* __cplusplus */
00088 
00089 PaError PaMacCore_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex index );
00090 
00091 #ifdef __cplusplus
00092 }
00093 #endif /* __cplusplus */
00094 
00095 #define RING_BUFFER_ADVANCE_DENOMINATOR (4)
00096 
00097 PaError ReadStream( PaStream* stream, void *buffer, unsigned long frames );
00098 PaError WriteStream( PaStream* stream, const void *buffer, unsigned long frames );
00099 signed long GetStreamReadAvailable( PaStream* stream );
00100 signed long GetStreamWriteAvailable( PaStream* stream );
00101 /* PaMacAUHAL - host api datastructure specific to this implementation */
00102 typedef struct
00103 {
00104     PaUtilHostApiRepresentation inheritedHostApiRep;
00105     PaUtilStreamInterface callbackStreamInterface;
00106     PaUtilStreamInterface blockingStreamInterface;
00107 
00108     PaUtilAllocationGroup *allocations;
00109 
00110     /* implementation specific data goes here */
00111     long devCount;
00112     AudioDeviceID *devIds; /*array of all audio devices*/
00113     AudioDeviceID defaultIn;
00114     AudioDeviceID defaultOut;
00115 }
00116 PaMacAUHAL;
00117 
00118 
00119 
00120 /* stream data structure specifically for this implementation */
00121 typedef struct PaMacCoreStream
00122 {
00123     PaUtilStreamRepresentation streamRepresentation;
00124     PaUtilCpuLoadMeasurer cpuLoadMeasurer;
00125     PaUtilBufferProcessor bufferProcessor;
00126 
00127     /* implementation specific data goes here */
00128     bool bufferProcessorIsInitialized;
00129     AudioUnit inputUnit;
00130     AudioUnit outputUnit;
00131     AudioDeviceID inputDevice;
00132     AudioDeviceID outputDevice;
00133     size_t userInChan;
00134     size_t userOutChan;
00135     size_t inputFramesPerBuffer;
00136     size_t outputFramesPerBuffer;
00137     PaMacBlio blio;
00138     /* We use this ring buffer when input and out devs are different. */
00139     RingBuffer inputRingBuffer;
00140     /* We may need to do SR conversion on input. */
00141     AudioConverterRef inputSRConverter;
00142     /* We need to preallocate an inputBuffer for reading data. */
00143     AudioBufferList inputAudioBufferList;
00144     AudioTimeStamp startTime;
00145     volatile PaStreamCallbackFlags xrunFlags;
00146     volatile bool isTimeSet;
00147     volatile enum {
00148        STOPPED          = 0, /* playback is completely stopped,
00149                                 and the user has called StopStream(). */
00150        CALLBACK_STOPPED = 1, /* callback has requested stop,
00151                                 but user has not yet called StopStream(). */
00152        STOPPING         = 2, /* The stream is in the process of closing.
00153                                 This state is just used internally;
00154                                 externally it is indistinguishable from
00155                                 ACTIVE.*/
00156        ACTIVE           = 3  /* The stream is active and running. */
00157     } state;
00158     double sampleRate;
00159     //these may be different from the stream sample rate due to SR conversion:
00160     double outDeviceSampleRate;
00161     double inDeviceSampleRate;
00162 }
00163 PaMacCoreStream;
00164 
00165 #endif /* PA_MAC_CORE_INTERNAL_H__ */

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