pd/portaudio/pa_asio ASIO-README.txt,NONE,1.1 Callback_adaptation_.pdf,1.2,1.3 Pa_ASIO.pdf,1.2,1.3 iasiothiscallresolver.cpp,1.1,1.2 iasiothiscallresolver.h,1.1,1.2 pa_asio.cpp,1.2,1.3 pa_asio.h,1.2,1.3 - Pd-cvs

6 Sep 2004


      Update of /cvsroot/pure-data/pd/portaudio/pa_asio
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv19253/portaudio/pa_asio
Added Files:
    ASIO-README.txt Callback_adaptation_.pdf Pa_ASIO.pdf 
    iasiothiscallresolver.cpp iasiothiscallresolver.h pa_asio.cpp 
    pa_asio.h 
Log Message:
More files I forgot to add
--- NEW FILE: pa_asio.cpp ---
/*
 * $Id: pa_asio.cpp,v 1.3 2004/09/06 21:03:00 millerpuckette Exp $
 * Portable Audio I/O Library for ASIO Drivers
 *
 * Author: Stephane Letz
 * Based on the Open Source API proposed by Ross Bencina
 * Copyright (c) 2000-2002 Stephane Letz, Phil Burk, 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.
 *
[...2617 lines suppressed...]
    asioError = ASIOExit();
    if( asioError != ASE_OK )
    {
        result = paUnanticipatedHostError;
        PA_ASIO_SET_LAST_ASIO_ERROR( asioError );
        asioIsInitialized = 0;
        goto error;
    }
PA_DEBUG(("PaAsio_ShowControlPanel: ASIOExit(): %s\n", PaAsio_GetAsioErrorText(asioError) ));
return result;
error:
    if( asioIsInitialized )
        ASIOExit();
return result;
}
--- NEW FILE: pa_asio.h ---
#ifndef PA_ASIO_H
#define PA_ASIO_H
/*
 * $Id: pa_asio.h,v 1.3 2004/09/06 21:03:01 millerpuckette Exp $
 * PortAudio Portable Real-Time Audio Library
 * ASIO 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.
 *
 * 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.
 *
 * 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.
 *
 */
/** @file
 @brief ASIO-specific PortAudio API extension header file.
*/
#include "portaudio.h"
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
/** Retrieve legal latency settings for the specificed device, in samples.
@param device The global index of the device about which the query is being made.
 @param minLatency A pointer to the location which will recieve the minimum latency value.
 @param maxLatency A pointer to the location which will recieve the maximum latency value.
 @param preferredLatency A pointer to the location which will recieve the preferred latency value.
 @param granularity A pointer to the location which will recieve the granularity. This value 
 determines which values between minLatency and maxLatency are available. ie the step size,
 if granularity is -1 then available latency settings are powers of two.
@see ASIOGetBufferSize in the ASIO SDK.
@todo This function should have a better name, any suggestions?
*/
PaError PaAsio_GetAvailableLatencyValues( PaDeviceIndex device,
    	long *minLatency, long *maxLatency, long *preferredLatency, long *granularity );
/** Display the ASIO control panel for the specified device.
@param device The global index of the device whose control panel is to be displayed.
  @param systemSpecific On Windows, the calling application's main window handle,
  on Macintosh this value should be zero.
*/
PaError PaAsio_ShowControlPanel( PaDeviceIndex device, void* systemSpecific );
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* PA_ASIO_H */
--- NEW FILE: iasiothiscallresolver.cpp ---
/*
    IASIOThiscallResolver.cpp see the comments in iasiothiscallresolver.h for
    the top level description - this comment describes the technical details of
    the implementation.
The latest version of this file is available from:
    http://www.audiomulch.com/~rossb/code/calliasio
please email comments to Ross Bencina rossb@audiomulch.com
BACKGROUND
The IASIO interface declared in the Steinberg ASIO 2 SDK declares
    functions with no explicit calling convention. This causes MSVC++ to default
    to using the thiscall convention, which is a proprietary convention not
    implemented by some non-microsoft compilers - notably borland BCC,
    C++Builder, and gcc. MSVC++ is the defacto standard compiler used by
    Steinberg. As a result of this situation, the ASIO sdk will compile with
    any compiler, however attempting to execute the compiled code will cause a
    crash due to different default calling conventions on non-Microsoft
    compilers.
IASIOThiscallResolver solves the problem by providing an adapter class that
    delegates to the IASIO interface using the correct calling convention
    (thiscall). Due to the lack of support for thiscall in the Borland and GCC
    compilers, the calls have been implemented in assembly language.
A number of macros are defined for thiscall function calls with different
    numbers of parameters, with and without return values - it may be possible
    to modify the format of these macros to make them work with other inline
    assemblers.
THISCALL DEFINITION
A number of definitions of the thiscall calling convention are floating
    around the internet. The following definition has been validated against
    output from the MSVC++ compiler:
For non-vararg functions, thiscall works as follows: the object (this)
    pointer is passed in ECX. All arguments are passed on the stack in
    right to left order. The return value is placed in EAX. The callee
    clears the passed arguments from the stack.
FINDING FUNCTION POINTERS FROM AN IASIO POINTER
The first field of a COM object is a pointer to its vtble. Thus a pointer
    to an object implementing the IASIO interface also points to a pointer to
    that object's vtbl. The vtble is a table of function pointers for all of
    the virtual functions exposed by the implemented interfaces.
If we consider a variable declared as a pointer to IASO:
IASIO *theAsioDriver
theAsioDriver points to:
object implementing IASIO
    {
        IASIOvtbl *vtbl
        other data
    }
in other words, theAsioDriver points to a pointer to an IASIOvtbl
vtbl points to a table of function pointers:
IASIOvtbl ( interface IASIO : public IUnknown )
    {
    (IUnknown functions)
    0   virtual HRESULT STDMETHODCALLTYPE (*QueryInterface)(REFIID riid, void **ppv) = 0;
    4   virtual ULONG STDMETHODCALLTYPE (*AddRef)() = 0;
    8   virtual ULONG STDMETHODCALLTYPE (*Release)() = 0;
(IASIO functions)
    12	virtual ASIOBool (*init)(void *sysHandle) = 0;
    16	virtual void (*getDriverName)(char *name) = 0;
    20	virtual long (*getDriverVersion)() = 0;
    24	virtual void (*getErrorMessage)(char *string) = 0;
    28	virtual ASIOError (*start)() = 0;
    32	virtual ASIOError (*stop)() = 0;
    36	virtual ASIOError (*getChannels)(long *numInputChannels, long *numOutputChannels) = 0;
    40	virtual ASIOError (*getLatencies)(long *inputLatency, long *outputLatency) = 0;
    44	virtual ASIOError (*getBufferSize)(long *minSize, long *maxSize,
            long *preferredSize, long *granularity) = 0;
    48	virtual ASIOError (*canSampleRate)(ASIOSampleRate sampleRate) = 0;
    52	virtual ASIOError (*getSampleRate)(ASIOSampleRate *sampleRate) = 0;
    56	virtual ASIOError (*setSampleRate)(ASIOSampleRate sampleRate) = 0;
    60	virtual ASIOError (*getClockSources)(ASIOClockSource *clocks, long *numSources) = 0;
    64	virtual ASIOError (*setClockSource)(long reference) = 0;
    68	virtual ASIOError (*getSamplePosition)(ASIOSamples *sPos, ASIOTimeStamp *tStamp) = 0;
    72	virtual ASIOError (*getChannelInfo)(ASIOChannelInfo *info) = 0;
    76	virtual ASIOError (*createBuffers)(ASIOBufferInfo *bufferInfos, long numChannels,
            long bufferSize, ASIOCallbacks *callbacks) = 0;
    80	virtual ASIOError (*disposeBuffers)() = 0;
    84	virtual ASIOError (*controlPanel)() = 0;
    88	virtual ASIOError (*future)(long selector,void *opt) = 0;
    92	virtual ASIOError (*outputReady)() = 0;
    };
The numbers in the left column show the byte offset of each function ptr
    from the beginning of the vtbl. These numbers are used in the code below
    to select different functions.
In order to find the address of a particular function, theAsioDriver
    must first be dereferenced to find the value of the vtbl pointer:
mov     eax, theAsioDriver
    mov     edx, [theAsioDriver]  // edx now points to vtbl[0]
Then an offset must be added to the vtbl pointer to select a
    particular function, for example vtbl+44 points to the slot containing
    a pointer to the getBufferSize function.
Finally vtbl+x must be dereferenced to obtain the value of the function
    pointer stored in that address:
call    [edx+44]    // call the function pointed to by
                        // the value in the getBufferSize field of the vtbl
SEE ALSO
Martin Fay's OpenASIO DLL at http://www.martinfay.com solves the same
    problem by providing a new COM interface which wraps IASIO with an
    interface that uses portable calling conventions. OpenASIO must be compiled
    with MSVC, and requires that you ship the OpenASIO DLL with your
    application.
ACKNOWLEDGEMENTS
Ross Bencina: worked out the thiscall details above, wrote the original
    Borland asm macros, and a patch for asio.cpp (which is no longer needed).
    Thanks to Martin Fay for introducing me to the issues discussed here,
    and to Rene G. Ceballos for assisting with asm dumps from MSVC++.
Antti Silvast: converted the original calliasio to work with gcc and NASM
    by implementing the asm code in a separate file.
Fraser Adams: modified the original calliasio containing the Borland inline
    asm to add inline asm for gcc i.e. Intel syntax for Borland and AT&T syntax
    for gcc. This seems a neater approach for gcc than to have a separate .asm
    file and it means that we only need one version of the thiscall patch.
Fraser Adams: rewrote the original calliasio patch in the form of the
    IASIOThiscallResolver class in order to avoid modifications to files from
    the Steinberg SDK, which may have had potential licence issues.
Andrew Baldwin: contributed fixes for compatibility problems with more
    recent versions of the gcc assembler.
*/
// We only need IASIOThiscallResolver at all if we are on Win32. For other
// platforms we simply bypass the IASIOThiscallResolver definition to allow us
// to be safely #include'd whatever the platform to keep client code portable
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
// If microsoft compiler we can call IASIO directly so IASIOThiscallResolver
// is not used.
#if !defined(_MSC_VER)
#include <new>
#include <assert.h>
// We have a mechanism in iasiothiscallresolver.h to ensure that asio.h is
// #include'd before it in client code, we do NOT want to do this test here.
#define iasiothiscallresolver_sourcefile 1
#include "iasiothiscallresolver.h"
#undef iasiothiscallresolver_sourcefile
// iasiothiscallresolver.h redefines ASIOInit for clients, but we don't want
// this macro defined in this translation unit.
#undef ASIOInit
// theAsioDriver is a global pointer to the current IASIO instance which the
// ASIO SDK uses to perform all actions on the IASIO interface. We substitute
// our own forwarding interface into this pointer.
extern IASIO* theAsioDriver;
// The following macros define the inline assembler for BORLAND first then gcc
#if defined(__BCPLUSPLUS__) || defined(__BORLANDC__)
#define CALL_THISCALL_0( resultName, thisPtr, funcOffset )\
    void *this_ = (thisPtr);                                                \
    __asm {                                                                 \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
        mov     resultName, eax       ;                                     \
    }
#define CALL_VOID_THISCALL_1( thisPtr, funcOffset, param1 )\
    void *this_ = (thisPtr);                                                \
    __asm {                                                                 \
        mov     eax, param1           ;                                     \
        push    eax                   ;                                     \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
    }
#define CALL_THISCALL_1( resultName, thisPtr, funcOffset, param1 )\
    void *this_ = (thisPtr);                                                \
    __asm {                                                                 \
        mov     eax, param1           ;                                     \
        push    eax                   ;                                     \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
        mov     resultName, eax       ;                                     \
    }
#define CALL_THISCALL_1_DOUBLE( resultName, thisPtr, funcOffset, param1 )\
    void *this_ = (thisPtr);                                                \
    void *doubleParamPtr_ (&param1);                                        \
    __asm {                                                                 \
        mov     eax, doubleParamPtr_  ;                                     \
        push    [eax+4]               ;                                     \
        push    [eax]                 ;                                     \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
        mov     resultName, eax       ;                                     \
    }
#define CALL_THISCALL_2( resultName, thisPtr, funcOffset, param1, param2 )\
    void *this_ = (thisPtr);                                                \
    __asm {                                                                 \
        mov     eax, param2           ;                                     \
        push    eax                   ;                                     \
        mov     eax, param1           ;                                     \
        push    eax                   ;                                     \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
        mov     resultName, eax       ;                                     \
    }
#define CALL_THISCALL_4( resultName, thisPtr, funcOffset, param1, param2, param3, param4 )\
    void *this_ = (thisPtr);                                                \
    __asm {                                                                 \
        mov     eax, param4           ;                                     \
        push    eax                   ;                                     \
        mov     eax, param3           ;                                     \
        push    eax                   ;                                     \
        mov     eax, param2           ;                                     \
        push    eax                   ;                                     \
        mov     eax, param1           ;                                     \
        push    eax                   ;                                     \
        mov     ecx, this_            ;                                     \
        mov     eax, [ecx]            ;                                     \
        call    [eax+funcOffset]      ;                                     \
        mov     resultName, eax       ;                                     \
    }
#elif defined(__GNUC__)
#define CALL_THISCALL_0( resultName, thisPtr, funcOffset )                  \
    __asm__ __volatile__ ("movl (%1), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx)\n\t"                  \
                          :"=a"(resultName) /* Output Operands */           \
                          :"c"(thisPtr)     /* Input Operands */            \
                         );                                                 \
#define CALL_VOID_THISCALL_1( thisPtr, funcOffset, param1 )                 \
    __asm__ __volatile__ ("pushl %0\n\t"                                    \
                          "movl (%1), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx)\n\t"                  \
                          :                 /* Output Operands */           \
                          :"r"(param1),     /* Input Operands */            \
                           "c"(thisPtr)                                     \
                         );                                                 \
#define CALL_THISCALL_1( resultName, thisPtr, funcOffset, param1 )          \
    __asm__ __volatile__ ("pushl %1\n\t"                                    \
                          "movl (%2), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx)\n\t"                  \
                          :"=a"(resultName) /* Output Operands */           \
                          :"r"(param1),     /* Input Operands */            \
                           "c"(thisPtr)                                     \
                          );                                                \
#define CALL_THISCALL_1_DOUBLE( resultName, thisPtr, funcOffset, param1 )   \
    __asm__ __volatile__ ("pushl 4(%1)\n\t"                                 \
                          "pushl (%1)\n\t"                                  \
                          "movl (%2), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx);\n\t"                 \
                          :"=a"(resultName) /* Output Operands */           \
                          :"a"(&param1),    /* Input Operands */            \
                           /* Note: Using "r" above instead of "a" fails */ \
                           /* when using GCC 3.3.3, and maybe later versions*/\
                           "c"(thisPtr)                                     \
                          );                                                \
#define CALL_THISCALL_2( resultName, thisPtr, funcOffset, param1, param2 )  \
    __asm__ __volatile__ ("pushl %1\n\t"                                    \
                          "pushl %2\n\t"                                    \
                          "movl (%3), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx)\n\t"                  \
                          :"=a"(resultName) /* Output Operands */           \
                          :"r"(param2),     /* Input Operands */            \
                           "r"(param1),                                     \
                           "c"(thisPtr)                                     \
                          );                                                \
#define CALL_THISCALL_4( resultName, thisPtr, funcOffset, param1, param2, param3, param4 )\
    __asm__ __volatile__ ("pushl %1\n\t"                                    \
                          "pushl %2\n\t"                                    \
                          "pushl %3\n\t"                                    \
                          "pushl %4\n\t"                                    \
                          "movl (%5), %%edx\n\t"                            \
                          "call *"#funcOffset"(%%edx)\n\t"                  \
                          :"=a"(resultName) /* Output Operands */           \
                          :"r"(param4),     /* Input Operands  */           \
                           "r"(param3),                                     \
                           "r"(param2),                                     \
                           "r"(param1),                                     \
                           "c"(thisPtr)                                     \
                          );                                                \
#endif
// Our static singleton instance.
IASIOThiscallResolver IASIOThiscallResolver::instance;
// Constructor called to initialize static Singleton instance above. Note that
// it is important not to clear that_ incase it has already been set by the call
// to placement new in ASIOInit().
IASIOThiscallResolver::IASIOThiscallResolver()
{
}
// Constructor called from ASIOInit() below
IASIOThiscallResolver::IASIOThiscallResolver(IASIO* that)
: that_( that )
{
}
// Implement IUnknown methods as assert(false). IASIOThiscallResolver is not
// really a COM object, just a wrapper which will work with the ASIO SDK.
// If you wanted to use ASIO without the SDK you might want to implement COM
// aggregation in these methods.
HRESULT STDMETHODCALLTYPE IASIOThiscallResolver::QueryInterface(REFIID riid, void **ppv)
{
    (void)riid;     // suppress unused variable warning
assert( false ); // this function should never be called by the ASIO SDK.
*ppv = NULL;
    return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE IASIOThiscallResolver::AddRef()
{
    assert( false ); // this function should never be called by the ASIO SDK.
return 1;
}
ULONG STDMETHODCALLTYPE IASIOThiscallResolver::Release()
{
    assert( false ); // this function should never be called by the ASIO SDK.
return 1;
}
// Implement the IASIO interface methods by performing the vptr manipulation
// described above then delegating to the real implementation.
ASIOBool IASIOThiscallResolver::init(void *sysHandle)
{
    ASIOBool result;
    CALL_THISCALL_1( result, that_, 12, sysHandle );
    return result;
}
void IASIOThiscallResolver::getDriverName(char *name)
{
    CALL_VOID_THISCALL_1( that_, 16, name );
}
long IASIOThiscallResolver::getDriverVersion()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 20 );
    return result;
}
void IASIOThiscallResolver::getErrorMessage(char *string)
{
     CALL_VOID_THISCALL_1( that_, 24, string );
}
ASIOError IASIOThiscallResolver::start()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 28 );
    return result;
}
ASIOError IASIOThiscallResolver::stop()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 32 );
    return result;
}
ASIOError IASIOThiscallResolver::getChannels(long *numInputChannels, long *numOutputChannels)
{
    ASIOBool result;
    CALL_THISCALL_2( result, that_, 36, numInputChannels, numOutputChannels );
    return result;
}
ASIOError IASIOThiscallResolver::getLatencies(long *inputLatency, long *outputLatency)
{
    ASIOBool result;
    CALL_THISCALL_2( result, that_, 40, inputLatency, outputLatency );
    return result;
}
ASIOError IASIOThiscallResolver::getBufferSize(long *minSize, long *maxSize,
        long *preferredSize, long *granularity)
{
    ASIOBool result;
    CALL_THISCALL_4( result, that_, 44, minSize, maxSize, preferredSize, granularity );
    return result;
}
ASIOError IASIOThiscallResolver::canSampleRate(ASIOSampleRate sampleRate)
{
    ASIOBool result;
    CALL_THISCALL_1_DOUBLE( result, that_, 48, sampleRate );
    return result;
}
ASIOError IASIOThiscallResolver::getSampleRate(ASIOSampleRate *sampleRate)
{
    ASIOBool result;
    CALL_THISCALL_1( result, that_, 52, sampleRate );
    return result;
}
ASIOError IASIOThiscallResolver::setSampleRate(ASIOSampleRate sampleRate)
{    
    ASIOBool result;
    CALL_THISCALL_1_DOUBLE( result, that_, 56, sampleRate );
    return result;
}
ASIOError IASIOThiscallResolver::getClockSources(ASIOClockSource *clocks, long *numSources)
{
    ASIOBool result;
    CALL_THISCALL_2( result, that_, 60, clocks, numSources );
    return result;
}
ASIOError IASIOThiscallResolver::setClockSource(long reference)
{
    ASIOBool result;
    CALL_THISCALL_1( result, that_, 64, reference );
    return result;
}
ASIOError IASIOThiscallResolver::getSamplePosition(ASIOSamples *sPos, ASIOTimeStamp *tStamp)
{
    ASIOBool result;
    CALL_THISCALL_2( result, that_, 68, sPos, tStamp );
    return result;
}
ASIOError IASIOThiscallResolver::getChannelInfo(ASIOChannelInfo *info)
{
    ASIOBool result;
    CALL_THISCALL_1( result, that_, 72, info );
    return result;
}
ASIOError IASIOThiscallResolver::createBuffers(ASIOBufferInfo *bufferInfos,
        long numChannels, long bufferSize, ASIOCallbacks *callbacks)
{
    ASIOBool result;
    CALL_THISCALL_4( result, that_, 76, bufferInfos, numChannels, bufferSize, callbacks );
    return result;
}
ASIOError IASIOThiscallResolver::disposeBuffers()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 80 );
    return result;
}
ASIOError IASIOThiscallResolver::controlPanel()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 84 );
    return result;
}
ASIOError IASIOThiscallResolver::future(long selector,void *opt)
{
    ASIOBool result;
    CALL_THISCALL_2( result, that_, 88, selector, opt );
    return result;
}
ASIOError IASIOThiscallResolver::outputReady()
{
    ASIOBool result;
    CALL_THISCALL_0( result, that_, 92 );
    return result;
}
// Implement our substitute ASIOInit() method
ASIOError IASIOThiscallResolver::ASIOInit(ASIODriverInfo *info)
{
    // To ensure that our instance's vptr is correctly constructed, even if
    // ASIOInit is called prior to main(), we explicitly call its constructor
    // (potentially over the top of an existing instance). Note that this is
    // pretty ugly, and is only safe because IASIOThiscallResolver has no
    // destructor and contains no objects with destructors.
    new((void*)&instance) IASIOThiscallResolver( theAsioDriver );
// Interpose between ASIO client code and the real driver.
    theAsioDriver = &instance;
// Note that we never need to switch theAsioDriver back to point to the
    // real driver because theAsioDriver is reset to zero in ASIOExit().
// Delegate to the real ASIOInit
    return ::ASIOInit(info);
}
#endif /* !defined(_MSC_VER) */
#endif /* Win32 */
--- NEW FILE: ASIO-README.txt ---
ASIO-README.txt
This document contains information to help you compile PortAudio with 
ASIO support. If you find any omissions or errors in this document 
please notify Ross Bencina rossb@audiomulch.com.
Building PortAudio with ASIO support
------------------------------------
To build PortAudio with ASIO support you need to compile and link with
pa_asio.c, and files from the ASIO SDK (see below), along with the common 
files from pa_common/ and platform specific files from pa_win/ (for Win32) 
or pa_mac/ (for Macintosh).
If you are compiling with a non-Microsoft compiler on windows, also 
compile and link with iasiothiscallresolver.cpp (see below for 
an explanation).
For some platforms (MingW, possibly Mac), you may simply
be able to type:
./configure --with-host_os=mingw --with-winapi=asio [--with-asiodir=/usr/local/asiosdk2]
make
./configure --with-host_os=darwin --with-winapi=asio [--with-asiodir=/usr/local/asiosdk2]
make
and life will be good.
Obtaining the ASIO SDK
----------------------
In order to build PortAudio with ASIO support, you need to download 
the ASIO SDK (version 2.0) from Steinberg. Steinberg makes the ASIO 
SDK available to anyone free of charge, however they do not permit its 
source code to be distributed.
NOTE: In some cases the ASIO SDK may require patching, see below 
for further details.
http://www.steinberg.net/en/ps/support/3rdparty/asio_sdk/
If the above link is broken search Google for:
"download steinberg ASIO SDK"
Building the ASIO SDK on Macintosh
----------------------------------
To build the ASIO SDK on Macintosh you need to compile and link with the 
following files from the ASIO SDK:
host/asiodrivers.cpp 
host/mac/asioshlib.cpp 
host/mac/codefragements.cpp
Building the ASIO SDK on Windows
--------------------------------
To build the ASIO SDK on Windows you need to compile and link with the 
following files from the ASIO SDK:
asio_sdk\common\asio.cpp
asio_sdk\host\asiodrivers.cpp
asio_sdk\host\pc\asiolist.cpp
You may also need to adjust your include paths to support inclusion of 
header files from the above directories.
The ASIO SDK depends on the following COM API functions: 
CoInitialize, CoUninitialize, CoCreateInstance, CLSIDFromString
For compilation with MinGW you will need to link with -lole32, for
Borland link with Import32.lib.
Non-Microsoft (MSVC) Compilers on Windows including Borland and GCC
-------------------------------------------------------------------
Steinberg did not specify a calling convention in the IASIO interface 
definition. This causes the Microsoft compiler to use the proprietary 
thiscall convention which is not compatible with other compilers, such 
as compilers from Borland (BCC and C++Builder) and GNU (gcc). 
Steinberg's ASIO SDK will compile but crash on initialization if 
compiled with a non-Microsoft compiler on Windows.
PortAudio solves this problem using the iasiothiscallresolver library 
which is included in the distribution. When building ASIO support for
non-Microsoft compilers, be sure to compile and link with
iasiothiscallresolver.cpp. Note that iasiothiscallresolver includes
conditional directives which cause it to have no effect if it is
compiled with a Microsoft compiler, or on the Macintosh.
If you use configure and make (see above), this should be handled
automatically for you.
For further information about the IASIO thiscall problem see this page:
http://www.audiomulch.com/~rossb/code/calliasio
Macintosh ASIO SDK Bug Patch
----------------------------
There is a bug in the ASIO SDK that causes the Macintosh version to 
often fail during initialization. Below is a patch that you can apply.
In codefragments.cpp replace getFrontProcessDirectory function with 
the following one (GetFrontProcess replaced by GetCurrentProcess).
bool CodeFragments::getFrontProcessDirectory(void *specs)
{
    FSSpec *fss = (FSSpec *)specs;
    ProcessInfoRec pif;
    ProcessSerialNumber psn;
memset(&psn,0,(long)sizeof(ProcessSerialNumber));
    //  if(GetFrontProcess(&psn) == noErr)  // wrong !!!
    if(GetCurrentProcess(&psn) == noErr)  // correct !!!
    {
    	pif.processName = 0;
    	pif.processAppSpec = fss;
    	pif.processInfoLength = sizeof(ProcessInfoRec);
    	if(GetProcessInformation(&psn, &pif) == noErr)
    			return true;
    }
    return false;
}
---
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--- NEW FILE: iasiothiscallresolver.h ---
// ****************************************************************************
// File:			IASIOThiscallResolver.h
// Description:     The IASIOThiscallResolver class implements the IASIO
//					interface and acts as a proxy to the real IASIO interface by
//                  calling through its vptr table using the thiscall calling
//                  convention. To put it another way, we interpose
//                  IASIOThiscallResolver between ASIO SDK code and the driver.
//                  This is necessary because most non-Microsoft compilers don't
//                  implement the thiscall calling convention used by IASIO.
//
//					iasiothiscallresolver.cpp contains the background of this
//					problem plus a technical description of the vptr
//                  manipulations.
//
//					In order to use this mechanism one simply has to add
//					iasiothiscallresolver.cpp to the list of files to compile
//                  and #include <iasiothiscallresolver.h>
//
//					Note that this #include must come after the other ASIO SDK
//                  #includes, for example:
//
//					#include <windows.h>
//					#include <asiosys.h>
//					#include <asio.h>
//					#include <asiodrivers.h>
//					#include <iasiothiscallresolver.h>
//
//					Actually the important thing is to #include
//                  <iasiothiscallresolver.h> after <asio.h>. We have
//                  incorporated a test to enforce this ordering.
//
//					The code transparently takes care of the interposition by
//                  using macro substitution to intercept calls to ASIOInit()
//                  and ASIOExit(). We save the original ASIO global
//                  "theAsioDriver" in our "that" variable, and then set
//                  "theAsioDriver" to equal our IASIOThiscallResolver instance.
//
// 					Whilst this method of resolving the thiscall problem requires
//					the addition of #include <iasiothiscallresolver.h> to client
//                  code it has the advantage that it does not break the terms
//                  of the ASIO licence by publishing it. We are NOT modifying
//                  any Steinberg code here, we are merely implementing the IASIO
//					interface in the same way that we would need to do if we
//					wished to provide an open source ASIO driver.
//
//					For compilation with MinGW -lole32 needs to be added to the
//                  linker options. For BORLAND, linking with Import32.lib is
//                  sufficient.
//
//					The dependencies are with: CoInitialize, CoUninitialize,
//					CoCreateInstance, CLSIDFromString - used by asiolist.cpp
//					and are required on Windows whether ThiscallResolver is used
//					or not.
//
//					Searching for the above strings in the root library path
//					of your compiler should enable the correct libraries to be
//					identified if they aren't immediately obvious.
//
//                  Note that the current implementation of IASIOThiscallResolver
//                  is not COM compliant - it does not correctly implement the
//                  IUnknown interface. Implementing it is not necessary because
//                  it is not called by parts of the ASIO SDK which call through
//                  theAsioDriver ptr. The IUnknown methods are implemented as
//                  assert(false) to ensure that the code fails if they are
//                  ever called.
// Restrictions:	None. Public Domain & Open Source distribute freely
//					You may use IASIOThiscallResolver commercially as well as
//                  privately.
//					You the user assume the responsibility for the use of the
//					files, binary or text, and there is no guarantee or warranty,
//					expressed or implied, including but not limited to the
//					implied warranties of merchantability and fitness for a
//					particular purpose. You assume all responsibility and agree
//					to hold no entity, copyright holder or distributors liable
//					for any loss of data or inaccurate representations of data
//					as a result of using IASIOThiscallResolver.
// Version:         1.4 Added separate macro CALL_THISCALL_1_DOUBLE from
//                  Andrew Baldwin, and volatile for whole gcc asm blocks,
//                  both for compatibility with newer gcc versions. Cleaned up
//                  Borland asm to use one less register.
//                  1.3 Switched to including assert.h for better compatibility.
//                  Wrapped entire .h and .cpp contents with a check for
//                  _MSC_VER to provide better compatibility with MS compilers.
//                  Changed Singleton implementation to use static instance
//                  instead of freestore allocated instance. Removed ASIOExit
//                  macro as it is no longer needed.
//                  1.2 Removed semicolons from ASIOInit and ASIOExit macros to
//                  allow them to be embedded in expressions (if statements).
//                  Cleaned up some comments. Removed combase.c dependency (it
//                  doesn't compile with BCB anyway) by stubbing IUnknown.
//                  1.1 Incorporated comments from Ross Bencina including things
//					such as changing name from ThiscallResolver to
//					IASIOThiscallResolver, tidying up the constructor, fixing
//					a bug in IASIOThiscallResolver::ASIOExit() and improving
//					portability through the use of conditional compilation
//					1.0 Initial working version.
// Created:			6/09/2003
// Authors:         Fraser Adams
//                  Ross Bencina
//                  Rene G. Ceballos
//                  Martin Fay
//                  Antti Silvast
//                  Andrew Baldwin
//
// ****************************************************************************
#ifndef included_iasiothiscallresolver_h
#define included_iasiothiscallresolver_h
// We only need IASIOThiscallResolver at all if we are on Win32. For other
// platforms we simply bypass the IASIOThiscallResolver definition to allow us
// to be safely #include'd whatever the platform to keep client code portable
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
// If microsoft compiler we can call IASIO directly so IASIOThiscallResolver
// is not used.
#if !defined(_MSC_VER)
// The following is in order to ensure that this header is only included after
// the other ASIO headers (except for the case of iasiothiscallresolver.cpp).
// We need to do this because IASIOThiscallResolver works by eclipsing the
// original definition of ASIOInit() with a macro (see below).
#if !defined(iasiothiscallresolver_sourcefile)
    #if !defined(__ASIO_H)
    #error iasiothiscallresolver.h must be included AFTER asio.h
    #endif
#endif
#include <windows.h>
#include <asiodrvr.h> /* From ASIO SDK */
class IASIOThiscallResolver : public IASIO {
private:
    IASIO* that_; // Points to the real IASIO
static IASIOThiscallResolver instance; // Singleton instance
// Constructors - declared private so construction is limited to
    // our Singleton instance
    IASIOThiscallResolver();
    IASIOThiscallResolver(IASIO* that);
public:
// Methods from the IUnknown interface. We don't fully implement IUnknown
    // because the ASIO SDK never calls these methods through theAsioDriver ptr.
    // These methods are implemented as assert(false).
    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppv);
    virtual ULONG STDMETHODCALLTYPE AddRef();
    virtual ULONG STDMETHODCALLTYPE Release();
// Methods from the IASIO interface, implemented as forwarning calls to that.
    virtual ASIOBool init(void *sysHandle);
    virtual void getDriverName(char *name);
    virtual long getDriverVersion();
    virtual void getErrorMessage(char *string);
    virtual ASIOError start();
    virtual ASIOError stop();
    virtual ASIOError getChannels(long *numInputChannels, long *numOutputChannels);
    virtual ASIOError getLatencies(long *inputLatency, long *outputLatency);
    virtual ASIOError getBufferSize(long *minSize, long *maxSize, long *preferredSize, long *granularity);
    virtual ASIOError canSampleRate(ASIOSampleRate sampleRate);
    virtual ASIOError getSampleRate(ASIOSampleRate *sampleRate);
    virtual ASIOError setSampleRate(ASIOSampleRate sampleRate);
    virtual ASIOError getClockSources(ASIOClockSource *clocks, long *numSources);
    virtual ASIOError setClockSource(long reference);
    virtual ASIOError getSamplePosition(ASIOSamples *sPos, ASIOTimeStamp *tStamp);
    virtual ASIOError getChannelInfo(ASIOChannelInfo *info);
    virtual ASIOError createBuffers(ASIOBufferInfo *bufferInfos, long numChannels, long bufferSize, ASIOCallbacks *callbacks);
    virtual ASIOError disposeBuffers();
    virtual ASIOError controlPanel();
    virtual ASIOError future(long selector,void *opt);
    virtual ASIOError outputReady();
// Class method, see ASIOInit() macro below.
    static ASIOError ASIOInit(ASIODriverInfo *info); // Delegates to ::ASIOInit
};
// Replace calls to ASIOInit with our interposing version.
// This macro enables us to perform thiscall resolution simply by #including
// <iasiothiscallresolver.h> after the asio #includes (this file _must_ be
// included _after_ the asio #includes)
#define ASIOInit(name) IASIOThiscallResolver::ASIOInit((name))
#endif /* !defined(_MSC_VER) */
#endif /* Win32 */
#endif /* included_iasiothiscallresolver_h */
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