diff options
Diffstat (limited to 'pd/portaudio/pa_asio')
| -rw-r--r-- | pd/portaudio/pa_asio/ASIO-README.txt | 137 | ||||
| -rw-r--r-- | pd/portaudio/pa_asio/Callback_adaptation_.pdf | bin | 0 -> 50527 bytes | |||
| -rw-r--r-- | pd/portaudio/pa_asio/Pa_ASIO.pdf | bin | 0 -> 50778 bytes | |||
| -rw-r--r-- | pd/portaudio/pa_asio/iasiothiscallresolver.cpp | 563 | ||||
| -rw-r--r-- | pd/portaudio/pa_asio/iasiothiscallresolver.h | 197 | ||||
| -rw-r--r-- | pd/portaudio/pa_asio/pa_asio.cpp | 2656 | ||||
| -rw-r--r-- | pd/portaudio/pa_asio/pa_asio.h | 79 |
7 files changed, 3632 insertions, 0 deletions
diff --git a/pd/portaudio/pa_asio/ASIO-README.txt b/pd/portaudio/pa_asio/ASIO-README.txt new file mode 100644 index 00000000..9fb74ae1 --- /dev/null +++ b/pd/portaudio/pa_asio/ASIO-README.txt @@ -0,0 +1,137 @@ +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; +} + + +--- diff --git a/pd/portaudio/pa_asio/Callback_adaptation_.pdf b/pd/portaudio/pa_asio/Callback_adaptation_.pdf Binary files differnew file mode 100644 index 00000000..76bf6786 --- /dev/null +++ b/pd/portaudio/pa_asio/Callback_adaptation_.pdf diff --git a/pd/portaudio/pa_asio/Pa_ASIO.pdf b/pd/portaudio/pa_asio/Pa_ASIO.pdf Binary files differnew file mode 100644 index 00000000..ac5ecadb --- /dev/null +++ b/pd/portaudio/pa_asio/Pa_ASIO.pdf diff --git a/pd/portaudio/pa_asio/iasiothiscallresolver.cpp b/pd/portaudio/pa_asio/iasiothiscallresolver.cpp new file mode 100644 index 00000000..8dfefbd6 --- /dev/null +++ b/pd/portaudio/pa_asio/iasiothiscallresolver.cpp @@ -0,0 +1,563 @@ +/* + 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_ (¶m1); \ + __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"(¶m1), /* 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 */ + diff --git a/pd/portaudio/pa_asio/iasiothiscallresolver.h b/pd/portaudio/pa_asio/iasiothiscallresolver.h new file mode 100644 index 00000000..2ecfed79 --- /dev/null +++ b/pd/portaudio/pa_asio/iasiothiscallresolver.h @@ -0,0 +1,197 @@ +// **************************************************************************** +// 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 */ + + diff --git a/pd/portaudio/pa_asio/pa_asio.cpp b/pd/portaudio/pa_asio/pa_asio.cpp new file mode 100644 index 00000000..34a2d39b --- /dev/null +++ b/pd/portaudio/pa_asio/pa_asio.cpp @@ -0,0 +1,2656 @@ +/* + * $Id: pa_asio.cpp,v 1.7.2.59 2004/02/15 15:39:05 rossbencina 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. + * + * 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. + */ + +/* Modification History + + 08-03-01 First version : Stephane Letz + 08-06-01 Tweaks for PC, use C++, buffer allocation, Float32 to Int32 conversion : Phil Burk + 08-20-01 More conversion, PA_StreamTime, Pa_GetHostError : Stephane Letz + 08-21-01 PaUInt8 bug correction, implementation of ASIOSTFloat32LSB and ASIOSTFloat32MSB native formats : Stephane Letz + 08-24-01 MAX_INT32_FP hack, another Uint8 fix : Stephane and Phil + 08-27-01 Implementation of hostBufferSize < userBufferSize case, better management of the ouput buffer when + the stream is stopped : Stephane Letz + 08-28-01 Check the stream pointer for null in bufferSwitchTimeInfo, correct bug in bufferSwitchTimeInfo when + the stream is stopped : Stephane Letz + 10-12-01 Correct the PaHost_CalcNumHostBuffers function: computes FramesPerHostBuffer to be the lowest that + respect requested FramesPerUserBuffer and userBuffersPerHostBuffer : Stephane Letz + 10-26-01 Management of hostBufferSize and userBufferSize of any size : Stephane Letz + 10-27-01 Improve calculus of hostBufferSize to be multiple or divisor of userBufferSize if possible : Stephane and Phil + 10-29-01 Change MAX_INT32_FP to (2147483520.0f) to prevent roundup to 0x80000000 : Phil Burk + 10-31-01 Clear the ouput buffer and user buffers in PaHost_StartOutput, correct bug in GetFirstMultiple : Stephane Letz + 11-06-01 Rename functions : Stephane Letz + 11-08-01 New Pa_ASIO_Adaptor_Init function to init Callback adpatation variables, cleanup of Pa_ASIO_Callback_Input: Stephane Letz + 11-29-01 Break apart device loading to debug random failure in Pa_ASIO_QueryDeviceInfo ; Phil Burk + 01-03-02 Desallocate all resources in PaHost_Term for cases where Pa_CloseStream is not called properly : Stephane Letz + 02-01-02 Cleanup, test of multiple-stream opening : Stephane Letz + 19-02-02 New Pa_ASIO_loadDriver that calls CoInitialize on each thread on Windows : Stephane Letz + 09-04-02 Correct error code management in PaHost_Term, removes various compiler warning : Stephane Letz + 12-04-02 Add Mac includes for <Devices.h> and <Timer.h> : Phil Burk + 13-04-02 Removes another compiler warning : Stephane Letz + 30-04-02 Pa_ASIO_QueryDeviceInfo bug correction, memory allocation checking, better error handling : D Viens, P Burk, S Letz + 12-06-02 Rehashed into new multi-api infrastructure, added support for all ASIO sample formats : Ross Bencina + 18-06-02 Added pa_asio.h, PaAsio_GetAvailableLatencyValues() : Ross B. + 21-06-02 Added SelectHostBufferSize() which selects host buffer size based on user latency parameters : Ross Bencina + ** NOTE maintanance history is now stored in CVS ** +*/ + +/** @file + + Note that specific support for paInputUnderflow, paOutputOverflow and + paNeverDropInput is not necessary or possible with this driver due to the + synchronous full duplex double-buffered architecture of ASIO. + + @todo check that CoInitialize()/CoUninitialize() are always correctly + paired, even in error cases. + + @todo implement host api specific extension to set i/o buffer sizes in frames + + @todo implement ReadStream, WriteStream, GetStreamReadAvailable, GetStreamWriteAvailable + + @todo implement IsFormatSupported + + @todo work out how to implement stream stoppage from callback and + implement IsStreamActive properly. Stream stoppage could be implemented + using a high-priority thread blocked on an Event which is signalled + by the callback. Or, we could just call ASIO stop from the callback + and see what happens. + + @todo rigorously check asio return codes and convert to pa error codes + + @todo Different channels of a multichannel stream can have different sample + formats, but we assume that all are the same as the first channel for now. + Fixing this will require the block processor to maintain per-channel + conversion functions - could get nasty. + + @todo investigate whether the asio processNow flag needs to be honoured + + @todo handle asioMessages() callbacks in a useful way, or at least document + what cases we don't handle. + + @todo miscellaneous other FIXMEs + + @todo provide an asio-specific method for setting the systems specific + value (aka main window handle) - check that this matches the value + passed to PaAsio_ShowControlPanel, or remove it entirely from + PaAsio_ShowControlPanel. - this would allow PaAsio_ShowControlPanel + to be called for the currently open stream (at present all streams + must be closed). +*/ + + + +#include <stdio.h> +#include <assert.h> +#include <string.h> +//#include <values.h> + +#include <windows.h> +#include <mmsystem.h> + +#include "portaudio.h" +#include "pa_asio.h" +#include "pa_util.h" +#include "pa_allocation.h" +#include "pa_hostapi.h" +#include "pa_stream.h" +#include "pa_cpuload.h" +#include "pa_process.h" + +#include "asiosys.h" +#include "asio.h" +#include "asiodrivers.h" +#include "iasiothiscallresolver.h" + +/* +#if MAC +#include <Devices.h> +#include <Timer.h> +#include <Math64.h> +#else +*/ +/* +#include <math.h> +#include <windows.h> +#include <mmsystem.h> +*/ +/* +#endif +*/ + +/* external references */ +extern AsioDrivers* asioDrivers ; +bool loadAsioDriver(char *name); + + +/* We are trying to be compatible with CARBON but this has not been thoroughly tested. */ +/* not tested at all since new code was introduced. */ +#define CARBON_COMPATIBLE (0) + + + + +/* prototypes for functions declared in this file */ + +extern "C" PaError PaAsio_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex ); +static void Terminate( struct PaUtilHostApiRepresentation *hostApi ); +static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi, + PaStream** s, + const PaStreamParameters *inputParameters, + const PaStreamParameters *outputParameters, + double sampleRate, + unsigned long framesPerBuffer, + PaStreamFlags streamFlags, + PaStreamCallback *streamCallback, + void *userData ); +static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi, + const PaStreamParameters *inputParameters, + const PaStreamParameters *outputParameters, + double sampleRate ); +static PaError CloseStream( PaStream* stream ); +static PaError StartStream( PaStream *stream ); +static PaError StopStream( PaStream *stream ); +static PaError AbortStream( PaStream *stream ); +static PaError IsStreamStopped( PaStream *s ); +static PaError IsStreamActive( PaStream *stream ); +static PaTime GetStreamTime( PaStream *stream ); +static double GetStreamCpuLoad( PaStream* stream ); +static PaError ReadStream( PaStream* stream, void *buffer, unsigned long frames ); +static PaError WriteStream( PaStream* stream, const void *buffer, unsigned long frames ); +static signed long GetStreamReadAvailable( PaStream* stream ); +static signed long GetStreamWriteAvailable( PaStream* stream ); + +/* our ASIO callback functions */ + +static void bufferSwitch(long index, ASIOBool processNow); +static ASIOTime *bufferSwitchTimeInfo(ASIOTime *timeInfo, long index, ASIOBool processNow); +static void sampleRateChanged(ASIOSampleRate sRate); +static long asioMessages(long selector, long value, void* message, double* opt); + +static ASIOCallbacks asioCallbacks_ = + { bufferSwitch, sampleRateChanged, asioMessages, bufferSwitchTimeInfo }; + + +#define PA_ASIO_SET_LAST_HOST_ERROR( errorCode, errorText ) \ + PaUtil_SetLastHostErrorInfo( paASIO, errorCode, errorText ) + + +static void PaAsio_SetLastSystemError( DWORD errorCode ) +{ + LPVOID lpMsgBuf; + FormatMessage( + FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, + NULL, + errorCode, + MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), + (LPTSTR) &lpMsgBuf, + 0, + NULL + ); + PaUtil_SetLastHostErrorInfo( paASIO, errorCode, (const char*)lpMsgBuf ); + LocalFree( lpMsgBuf ); +} + +#define PA_ASIO_SET_LAST_SYSTEM_ERROR( errorCode ) \ + PaAsio_SetLastSystemError( errorCode ) + + +static const char* PaAsio_GetAsioErrorText( ASIOError asioError ) +{ + const char *result; + + switch( asioError ){ + case ASE_OK: + case ASE_SUCCESS: result = "Success"; break; + case ASE_NotPresent: result = "Hardware input or output is not present or available"; break; + case ASE_HWMalfunction: result = "Hardware is malfunctioning"; break; + case ASE_InvalidParameter: result = "Input parameter invalid"; break; + case ASE_InvalidMode: result = "Hardware is in a bad mode or used in a bad mode"; break; + case ASE_SPNotAdvancing: result = "Hardware is not running when sample position is inquired"; break; + case ASE_NoClock: result = "Sample clock or rate cannot be determined or is not present"; break; + case ASE_NoMemory: result = "Not enough memory for completing the request"; break; + default: result = "Unknown ASIO error"; break; + } + + return result; +} + + +#define PA_ASIO_SET_LAST_ASIO_ERROR( asioError ) \ + PaUtil_SetLastHostErrorInfo( paASIO, asioError, PaAsio_GetAsioErrorText( asioError ) ) + + + + +// Atomic increment and decrement operations +#if MAC + /* need to be implemented on Mac */ + inline long PaAsio_AtomicIncrement(volatile long* v) {return ++(*const_cast<long*>(v));} + inline long PaAsio_AtomicDecrement(volatile long* v) {return --(*const_cast<long*>(v));} +#elif WINDOWS + inline long PaAsio_AtomicIncrement(volatile long* v) {return InterlockedIncrement(const_cast<long*>(v));} + inline long PaAsio_AtomicDecrement(volatile long* v) {return InterlockedDecrement(const_cast<long*>(v));} +#endif + + + +typedef struct PaAsioDriverInfo +{ + ASIODriverInfo asioDriverInfo; + long inputChannelCount, outputChannelCount; + long bufferMinSize, bufferMaxSize, bufferPreferredSize, bufferGranularity; + bool postOutput; +} +PaAsioDriverInfo; + + +/* PaAsioHostApiRepresentation - host api datastructure specific to this implementation */ + +typedef struct +{ + PaUtilHostApiRepresentation inheritedHostApiRep; + PaUtilStreamInterface callbackStreamInterface; + PaUtilStreamInterface blockingStreamInterface; + + PaUtilAllocationGroup *allocations; + + void *systemSpecific; + + /* the ASIO C API only allows one ASIO driver to be open at a time, + so we kee track of whether we have the driver open here, and + use this information to return errors from OpenStream if the + driver is already open. + + openAsioDeviceIndex will be PaNoDevice if there is no device open + and a valid pa_asio (not global) device index otherwise. + + openAsioDriverInfo is populated with the driver info for the + currently open device (if any) + */ + PaDeviceIndex openAsioDeviceIndex; + PaAsioDriverInfo openAsioDriverInfo; +} +PaAsioHostApiRepresentation; + + +/* + Retrieve <driverCount> driver names from ASIO, returned in a char** + allocated in <group>. +*/ +static char **GetAsioDriverNames( PaUtilAllocationGroup *group, long driverCount ) +{ + char **result = 0; + int i; + + result =(char**)PaUtil_GroupAllocateMemory( + group, sizeof(char*) * driverCount ); + if( !result ) + goto error; + + result[0] = (char*)PaUtil_GroupAllocateMemory( + group, 32 * driverCount ); + if( !result[0] ) + goto error; + + for( i=0; i<driverCount; ++i ) + result[i] = result[0] + (32 * i); + + asioDrivers->getDriverNames( result, driverCount ); + +error: + return result; +} + + +static PaSampleFormat AsioSampleTypeToPaNativeSampleFormat(ASIOSampleType type) +{ + switch (type) { + case ASIOSTInt16MSB: + case ASIOSTInt16LSB: + return paInt16; + + case ASIOSTFloat32MSB: + case ASIOSTFloat32LSB: + case ASIOSTFloat64MSB: + case ASIOSTFloat64LSB: + return paFloat32; + + case ASIOSTInt32MSB: + case ASIOSTInt32LSB: + case ASIOSTInt32MSB16: + case ASIOSTInt32LSB16: + case ASIOSTInt32MSB18: + case ASIOSTInt32MSB20: + case ASIOSTInt32MSB24: + case ASIOSTInt32LSB18: + case ASIOSTInt32LSB20: + case ASIOSTInt32LSB24: + return paInt32; + + case ASIOSTInt24MSB: + case ASIOSTInt24LSB: + return paInt24; + + default: + return paCustomFormat; + } +} + + +static int BytesPerAsioSample( ASIOSampleType sampleType ) +{ + switch (sampleType) { + case ASIOSTInt16MSB: + case ASIOSTInt16LSB: + return 2; + + case ASIOSTFloat64MSB: + case ASIOSTFloat64LSB: + return 8; + + case ASIOSTFloat32MSB: + case ASIOSTFloat32LSB: + case ASIOSTInt32MSB: + case ASIOSTInt32LSB: + case ASIOSTInt32MSB16: + case ASIOSTInt32LSB16: + case ASIOSTInt32MSB18: + case ASIOSTInt32MSB20: + case ASIOSTInt32MSB24: + case ASIOSTInt32LSB18: + case ASIOSTInt32LSB20: + case ASIOSTInt32LSB24: + return 4; + + case ASIOSTInt24MSB: + case ASIOSTInt24LSB: + return 3; + + default: + return 0; + } +} + + +static void Swap16( void *buffer, long shift, long count ) +{ + unsigned short *p = (unsigned short*)buffer; + unsigned short temp; + (void) shift; /* unused parameter */ + + while( count-- ) + { + temp = *p; + *p++ = (unsigned short)((temp<<8) | (temp>>8)); + } +} + +static void Swap24( void *buffer, long shift, long count ) +{ + unsigned char *p = (unsigned char*)buffer; + unsigned char temp; + (void) shift; /* unused parameter */ + + while( count-- ) + { + temp = *p; + *p = *(p+2); + *(p+2) = temp; + p += 3; + } +} + +#define PA_SWAP32_( x ) ((x>>24) | ((x>>8)&0xFF00) | ((x<<8)&0xFF0000) | (x<<24)); + +static void Swap32( void *buffer, long shift, long count ) +{ + unsigned long *p = (unsigned long*)buffer; + unsigned long temp; + (void) shift; /* unused parameter */ + + while( count-- ) + { + temp = *p; + *p++ = PA_SWAP32_( temp); + } +} + +static void SwapShiftLeft32( void *buffer, long shift, long count ) +{ + unsigned long *p = (unsigned long*)buffer; + unsigned long temp; + + while( count-- ) + { + temp = *p; + temp = PA_SWAP32_( temp); + *p++ = temp << shift; + } +} + +static void ShiftRightSwap32( void *buffer, long shift, long count ) +{ + unsigned long *p = (unsigned long*)buffer; + unsigned long temp; + + while( count-- ) + { + temp = *p >> shift; + *p++ = PA_SWAP32_( temp); + } +} + +static void ShiftLeft32( void *buffer, long shift, long count ) +{ + unsigned long *p = (unsigned long*)buffer; + unsigned long temp; + + while( count-- ) + { + temp = *p; + *p++ = temp << shift; + } +} + +static void ShiftRight32( void *buffer, long shift, long count ) +{ + unsigned long *p = (unsigned long*)buffer; + unsigned long temp; + + while( count-- ) + { + temp = *p; + *p++ = temp >> shift; + } +} + +#define PA_SWAP_( x, y ) temp=x; x = y; y = temp; + +static void Swap64ConvertFloat64ToFloat32( void *buffer, long shift, long count ) +{ + double *in = (double*)buffer; + float *out = (float*)buffer; + unsigned char *p; + unsigned char temp; + (void) shift; /* unused parameter */ + + while( count-- ) + { + p = (unsigned char*)in; + PA_SWAP_( p[0], p[7] ); + PA_SWAP_( p[1], p[6] ); + PA_SWAP_( p[2], p[5] ); + PA_SWAP_( p[3], p[4] ); + + *out++ = (float) (*in++); + } +} + +static void ConvertFloat64ToFloat32( void *buffer, long shift, long count ) +{ + double *in = (double*)buffer; + float *out = (float*)buffer; + (void) shift; /* unused parameter */ + + while( count-- ) + *out++ = (float) (*in++); +} + +static void ConvertFloat32ToFloat64Swap64( void *buffer, long shift, long count ) +{ + float *in = ((float*)buffer) + (count-1); + double *out = ((double*)buffer) + (count-1); + unsigned char *p; + unsigned char temp; + (void) shift; /* unused parameter */ + + while( count-- ) + { + *out = *in--; + + p = (unsigned char*)out; + PA_SWAP_( p[0], p[7] ); + PA_SWAP_( p[1], p[6] ); + PA_SWAP_( p[2], p[5] ); + PA_SWAP_( p[3], p[4] ); + + out--; + } +} + +static void ConvertFloat32ToFloat64( void *buffer, long shift, long count ) +{ + float *in = ((float*)buffer) + (count-1); + double *out = ((double*)buffer) + (count-1); + (void) shift; /* unused parameter */ + + while( count-- ) + *out-- = *in--; +} + +#ifdef MAC +#define PA_MSB_IS_NATIVE_ +#undef PA_LSB_IS_NATIVE_ +#endif + +#ifdef WINDOWS +#undef PA_MSB_IS_NATIVE_ +#define PA_LSB_IS_NATIVE_ +#endif + +typedef void PaAsioBufferConverter( void *, long, long ); + +static void SelectAsioToPaConverter( ASIOSampleType type, PaAsioBufferConverter **converter, long *shift ) +{ + *shift = 0; + *converter = 0; + + switch (type) { + case ASIOSTInt16MSB: + /* dest: paInt16, no conversion necessary, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap16; + #endif + break; + case ASIOSTInt16LSB: + /* dest: paInt16, no conversion necessary, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap16; + #endif + break; + case ASIOSTFloat32MSB: + /* dest: paFloat32, no conversion necessary, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTFloat32LSB: + /* dest: paFloat32, no conversion necessary, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTFloat64MSB: + /* dest: paFloat32, in-place conversion to/from float32, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap64ConvertFloat64ToFloat32; + #else + *converter = ConvertFloat64ToFloat32; + #endif + break; + case ASIOSTFloat64LSB: + /* dest: paFloat32, in-place conversion to/from float32, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap64ConvertFloat64ToFloat32; + #else + *converter = ConvertFloat64ToFloat32; + #endif + break; + case ASIOSTInt32MSB: + /* dest: paInt32, no conversion necessary, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTInt32LSB: + /* dest: paInt32, no conversion necessary, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTInt32MSB16: + /* dest: paInt32, 16 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 16; + break; + case ASIOSTInt32MSB18: + /* dest: paInt32, 14 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 14; + break; + case ASIOSTInt32MSB20: + /* dest: paInt32, 12 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 12; + break; + case ASIOSTInt32MSB24: + /* dest: paInt32, 8 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 8; + break; + case ASIOSTInt32LSB16: + /* dest: paInt32, 16 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 16; + break; + case ASIOSTInt32LSB18: + /* dest: paInt32, 14 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 14; + break; + case ASIOSTInt32LSB20: + /* dest: paInt32, 12 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 12; + break; + case ASIOSTInt32LSB24: + /* dest: paInt32, 8 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = SwapShiftLeft32; + #else + *converter = ShiftLeft32; + #endif + *shift = 8; + break; + case ASIOSTInt24MSB: + /* dest: paInt24, no conversion necessary, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap24; + #endif + break; + case ASIOSTInt24LSB: + /* dest: paInt24, no conversion necessary, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap24; + #endif + break; + } +} + + +static void SelectPaToAsioConverter( ASIOSampleType type, PaAsioBufferConverter **converter, long *shift ) +{ + *shift = 0; + *converter = 0; + + switch (type) { + case ASIOSTInt16MSB: + /* src: paInt16, no conversion necessary, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap16; + #endif + break; + case ASIOSTInt16LSB: + /* src: paInt16, no conversion necessary, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap16; + #endif + break; + case ASIOSTFloat32MSB: + /* src: paFloat32, no conversion necessary, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTFloat32LSB: + /* src: paFloat32, no conversion necessary, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTFloat64MSB: + /* src: paFloat32, in-place conversion to/from float32, possible byte swap*/ + #ifdef PA_LSB_IS_NATIVE_ + *converter = ConvertFloat32ToFloat64Swap64; + #else + *converter = ConvertFloat32ToFloat64; + #endif + break; + case ASIOSTFloat64LSB: + /* src: paFloat32, in-place conversion to/from float32, possible byte swap*/ + #ifdef PA_MSB_IS_NATIVE_ + *converter = ConvertFloat32ToFloat64Swap64; + #else + *converter = ConvertFloat32ToFloat64; + #endif + break; + case ASIOSTInt32MSB: + /* src: paInt32, no conversion necessary, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTInt32LSB: + /* src: paInt32, no conversion necessary, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap32; + #endif + break; + case ASIOSTInt32MSB16: + /* src: paInt32, 16 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 16; + break; + case ASIOSTInt32MSB18: + /* src: paInt32, 14 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 14; + break; + case ASIOSTInt32MSB20: + /* src: paInt32, 12 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 12; + break; + case ASIOSTInt32MSB24: + /* src: paInt32, 8 bit shift, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 8; + break; + case ASIOSTInt32LSB16: + /* src: paInt32, 16 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 16; + break; + case ASIOSTInt32LSB18: + /* src: paInt32, 14 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 14; + break; + case ASIOSTInt32LSB20: + /* src: paInt32, 12 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 12; + break; + case ASIOSTInt32LSB24: + /* src: paInt32, 8 bit shift, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = ShiftRightSwap32; + #else + *converter = ShiftRight32; + #endif + *shift = 8; + break; + case ASIOSTInt24MSB: + /* src: paInt24, no conversion necessary, possible byte swap */ + #ifdef PA_LSB_IS_NATIVE_ + *converter = Swap24; + #endif + break; + case ASIOSTInt24LSB: + /* src: paInt24, no conversion necessary, possible byte swap */ + #ifdef PA_MSB_IS_NATIVE_ + *converter = Swap24; + #endif + break; + } +} + + +typedef struct PaAsioDeviceInfo +{ + PaDeviceInfo commonDeviceInfo; + long minBufferSize; + long maxBufferSize; + long preferredBufferSize; + long bufferGranularity; +} +PaAsioDeviceInfo; + + +PaError PaAsio_GetAvailableLatencyValues( PaDeviceIndex device, + long *minLatency, long *maxLatency, long *preferredLatency, long *granularity ) +{ + PaError result; + PaUtilHostApiRepresentation *hostApi; + PaDeviceIndex hostApiDevice; + + result = PaUtil_GetHostApiRepresentation( &hostApi, paASIO ); + + if( result == paNoError ) + { + result = PaUtil_DeviceIndexToHostApiDeviceIndex( &hostApiDevice, device, hostApi ); + + if( result == paNoError ) + { + PaAsioDeviceInfo *asioDeviceInfo = + (PaAsioDeviceInfo*)hostApi->deviceInfos[hostApiDevice]; + + *minLatency = asioDeviceInfo->minBufferSize; + *maxLatency = asioDeviceInfo->maxBufferSize; + *preferredLatency = asioDeviceInfo->preferredBufferSize; + *granularity = asioDeviceInfo->bufferGranularity; + } + } + + return result; +} + + + +/* + load the asio driver named by <driverName> and return statistics about + the driver in info. If no error occurred, the driver will remain open + and must be closed by the called by calling ASIOExit() - if an error + is returned the driver will already be closed. +*/ +static PaError LoadAsioDriver( const char *driverName, + PaAsioDriverInfo *driverInfo, void *systemSpecific ) +{ + PaError result = paNoError; + ASIOError asioError; + int asioIsInitialized = 0; + + if( !loadAsioDriver( const_cast<char*>(driverName) ) ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_HOST_ERROR( 0, "Failed to load ASIO driver" ); + goto error; + } + + memset( &driverInfo->asioDriverInfo, 0, sizeof(ASIODriverInfo) ); + driverInfo->asioDriverInfo.asioVersion = 2; + driverInfo->asioDriverInfo.sysRef = systemSpecific; + if( (asioError = ASIOInit( &driverInfo->asioDriverInfo )) != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + else + { + asioIsInitialized = 1; + } + + if( (asioError = ASIOGetChannels(&driverInfo->inputChannelCount, + &driverInfo->outputChannelCount)) != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + + if( (asioError = ASIOGetBufferSize(&driverInfo->bufferMinSize, + &driverInfo->bufferMaxSize, &driverInfo->bufferPreferredSize, + &driverInfo->bufferGranularity)) != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + + if( ASIOOutputReady() == ASE_OK ) + driverInfo->postOutput = true; + else + driverInfo->postOutput = false; + + return result; + +error: + if( asioIsInitialized ) + ASIOExit(); + + return result; +} + + +#define PA_DEFAULTSAMPLERATESEARCHORDER_COUNT_ 13 /* must be the same number of elements as in the array below */ +static ASIOSampleRate defaultSampleRateSearchOrder_[] + = {44100.0, 48000.0, 32000.0, 24000.0, 22050.0, 88200.0, 96000.0, + 192000.0, 16000.0, 12000.0, 11025.0, 96000.0, 8000.0 }; + + +PaError PaAsio_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex ) +{ + PaError result = paNoError; + int i, driverCount; + PaAsioHostApiRepresentation *asioHostApi; + PaAsioDeviceInfo *deviceInfoArray; + char **names; + PaAsioDriverInfo paAsioDriverInfo; + ASIOChannelInfo asioChannelInfo; + + asioHostApi = (PaAsioHostApiRepresentation*)PaUtil_AllocateMemory( sizeof(PaAsioHostApiRepresentation) ); + if( !asioHostApi ) + { + result = paInsufficientMemory; + goto error; + } + + asioHostApi->allocations = PaUtil_CreateAllocationGroup(); + if( !asioHostApi->allocations ) + { + result = paInsufficientMemory; + goto error; + } + + asioHostApi->systemSpecific = 0; + asioHostApi->openAsioDeviceIndex = paNoDevice; + + *hostApi = &asioHostApi->inheritedHostApiRep; + (*hostApi)->info.structVersion = 1; + + (*hostApi)->info.type = paASIO; + (*hostApi)->info.name = "ASIO"; + (*hostApi)->info.deviceCount = 0; + + #ifdef WINDOWS + /* use desktop window as system specific ptr */ + asioHostApi->systemSpecific = GetDesktopWindow(); + CoInitialize(NULL); + #endif + + /* MUST BE CHECKED : to force fragments loading on Mac */ + loadAsioDriver( "dummy" ); + + /* driverCount is the number of installed drivers - not necessarily + the number of installed physical devices. */ + #if MAC + driverCount = asioDrivers->getNumFragments(); + #elif WINDOWS + driverCount = asioDrivers->asioGetNumDev(); + #endif + + if( driverCount > 0 ) + { + names = GetAsioDriverNames( asioHostApi->allocations, driverCount ); + if( !names ) + { + result = paInsufficientMemory; + goto error; + } + + + /* allocate enough space for all drivers, even if some aren't installed */ + + (*hostApi)->deviceInfos = (PaDeviceInfo**)PaUtil_GroupAllocateMemory( + asioHostApi->allocations, sizeof(PaDeviceInfo*) * driverCount ); + if( !(*hostApi)->deviceInfos ) + { + result = paInsufficientMemory; + goto error; + } + + /* allocate all device info structs in a contiguous block */ + deviceInfoArray = (PaAsioDeviceInfo*)PaUtil_GroupAllocateMemory( + asioHostApi->allocations, sizeof(PaAsioDeviceInfo) * driverCount ); + if( !deviceInfoArray ) + { + result = paInsufficientMemory; + goto error; + } + + for( i=0; i < driverCount; ++i ) + { + /* Attempt to load the asio driver... */ + if( LoadAsioDriver( names[i], &paAsioDriverInfo, asioHostApi->systemSpecific ) == paNoError ) + { + PaAsioDeviceInfo *asioDeviceInfo = &deviceInfoArray[ (*hostApi)->info.deviceCount ]; + PaDeviceInfo *deviceInfo = &asioDeviceInfo->commonDeviceInfo; + + deviceInfo->structVersion = 2; + deviceInfo->hostApi = hostApiIndex; + + deviceInfo->name = names[i]; + PA_DEBUG(("PaAsio_Initialize: drv:%d name = %s\n", i,deviceInfo->name)); + + deviceInfo->maxInputChannels = paAsioDriverInfo.inputChannelCount; + deviceInfo->maxOutputChannels = paAsioDriverInfo.outputChannelCount; + + PA_DEBUG(("PaAsio_Initialize: drv:%d inputChannels = %d\n", i, paAsioDriverInfo.inputChannelCount)); + PA_DEBUG(("PaAsio_Initialize: drv:%d outputChannels = %d\n", i, paAsioDriverInfo.outputChannelCount)); + + deviceInfo->defaultSampleRate = 0.; + bool foundDefaultSampleRate = false; + for( int j=0; j < PA_DEFAULTSAMPLERATESEARCHORDER_COUNT_; ++j ) + { + ASIOError asioError = ASIOCanSampleRate( defaultSampleRateSearchOrder_[j] ); + if( asioError != ASE_NoClock && asioError != ASE_NotPresent ) + { + deviceInfo->defaultSampleRate = defaultSampleRateSearchOrder_[j]; + foundDefaultSampleRate = true; + break; + } + } + + PA_DEBUG(("PaAsio_Initialize: drv:%d defaultSampleRate = %f\n", i, deviceInfo->defaultSampleRate)); + + if( foundDefaultSampleRate ){ + + /* calculate default latency values from bufferPreferredSize + for default low latency, and bufferPreferredSize * 3 + for default high latency. + use the default sample rate to convert from samples to + seconds. Without knowing what sample rate the user will + use this is the best we can do. + */ + + double defaultLowLatency = + paAsioDriverInfo.bufferPreferredSize / deviceInfo->defaultSampleRate; + + deviceInfo->defaultLowInputLatency = defaultLowLatency; + deviceInfo->defaultLowOutputLatency = defaultLowLatency; + + long defaultHighLatencyBufferSize = + paAsioDriverInfo.bufferPreferredSize * 3; + + if( defaultHighLatencyBufferSize > paAsioDriverInfo.bufferMaxSize ) + defaultHighLatencyBufferSize = paAsioDriverInfo.bufferMaxSize; + + double defaultHighLatency = + defaultHighLatencyBufferSize / deviceInfo->defaultSampleRate; + + if( defaultHighLatency < defaultLowLatency ) + defaultHighLatency = defaultLowLatency; /* just incase the driver returns something strange */ + + deviceInfo->defaultHighInputLatency = defaultHighLatency; + deviceInfo->defaultHighOutputLatency = defaultHighLatency; + + }else{ + + deviceInfo->defaultLowInputLatency = 0.; + deviceInfo->defaultLowOutputLatency = 0.; + deviceInfo->defaultHighInputLatency = 0.; + deviceInfo->defaultHighOutputLatency = 0.; + } + + PA_DEBUG(("PaAsio_Initialize: drv:%d defaultLowInputLatency = %f\n", i, deviceInfo->defaultLowInputLatency)); + PA_DEBUG(("PaAsio_Initialize: drv:%d defaultLowOutputLatency = %f\n", i, deviceInfo->defaultLowOutputLatency)); + PA_DEBUG(("PaAsio_Initialize: drv:%d defaultHighInputLatency = %f\n", i, deviceInfo->defaultHighInputLatency)); + PA_DEBUG(("PaAsio_Initialize: drv:%d defaultHighOutputLatency = %f\n", i, deviceInfo->defaultHighOutputLatency)); + + asioDeviceInfo->minBufferSize = paAsioDriverInfo.bufferMinSize; + asioDeviceInfo->maxBufferSize = paAsioDriverInfo.bufferMaxSize; + asioDeviceInfo->preferredBufferSize = paAsioDriverInfo.bufferPreferredSize; + asioDeviceInfo->bufferGranularity = paAsioDriverInfo.bufferGranularity; + + + /* We assume that all channels have the same SampleType, so check the first, FIXME, probably shouldn't assume that */ + asioChannelInfo.channel = 0; + asioChannelInfo.isInput = 1; + ASIOGetChannelInfo( &asioChannelInfo ); /* FIXME, check return code */ + + + /* unload the driver */ + ASIOExit(); + + (*hostApi)->deviceInfos[ (*hostApi)->info.deviceCount ] = deviceInfo; + ++(*hostApi)->info.deviceCount; + } + } + } + + if( (*hostApi)->info.deviceCount > 0 ) + { + (*hostApi)->info.defaultInputDevice = 0; + (*hostApi)->info.defaultOutputDevice = 0; + } + else + { + (*hostApi)->info.defaultInputDevice = paNoDevice; + (*hostApi)->info.defaultOutputDevice = paNoDevice; + } + + + (*hostApi)->Terminate = Terminate; + (*hostApi)->OpenStream = OpenStream; + (*hostApi)->IsFormatSupported = IsFormatSupported; + + PaUtil_InitializeStreamInterface( &asioHostApi->callbackStreamInterface, CloseStream, StartStream, + StopStream, AbortStream, IsStreamStopped, IsStreamActive, + GetStreamTime, GetStreamCpuLoad, + PaUtil_DummyRead, PaUtil_DummyWrite, + PaUtil_DummyGetReadAvailable, PaUtil_DummyGetWriteAvailable ); + + PaUtil_InitializeStreamInterface( &asioHostApi->blockingStreamInterface, CloseStream, StartStream, + StopStream, AbortStream, IsStreamStopped, IsStreamActive, + GetStreamTime, PaUtil_DummyGetCpuLoad, + ReadStream, WriteStream, GetStreamReadAvailable, GetStreamWriteAvailable ); + + return result; + +error: + if( asioHostApi ) + { + if( asioHostApi->allocations ) + { + PaUtil_FreeAllAllocations( asioHostApi->allocations ); + PaUtil_DestroyAllocationGroup( asioHostApi->allocations ); + } + + PaUtil_FreeMemory( asioHostApi ); + } + return result; +} + + +static void Terminate( struct PaUtilHostApiRepresentation *hostApi ) +{ + PaAsioHostApiRepresentation *asioHostApi = (PaAsioHostApiRepresentation*)hostApi; + + /* + IMPLEMENT ME: + - clean up any resources not handled by the allocation group + */ + + if( asioHostApi->allocations ) + { + PaUtil_FreeAllAllocations( asioHostApi->allocations ); + PaUtil_DestroyAllocationGroup( asioHostApi->allocations ); + } + + PaUtil_FreeMemory( asioHostApi ); +} + + +static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi, + const PaStreamParameters *inputParameters, + const PaStreamParameters *outputParameters, + double sampleRate ) +{ + PaError result = paNoError; + PaAsioHostApiRepresentation *asioHostApi = (PaAsioHostApiRepresentation*)hostApi; + PaAsioDriverInfo *driverInfo = &asioHostApi->openAsioDriverInfo; + int inputChannelCount, outputChannelCount; + PaSampleFormat inputSampleFormat, outputSampleFormat; + PaDeviceIndex asioDeviceIndex; + ASIOError asioError; + + if( inputParameters && outputParameters ) + { + /* full duplex ASIO stream must use the same device for input and output */ + + if( inputParameters->device != outputParameters->device ) + return paBadIODeviceCombination; + } + + if( inputParameters ) + { + inputChannelCount = inputParameters->channelCount; + inputSampleFormat = inputParameters->sampleFormat; + + /* all standard sample formats are supported by the buffer adapter, + this implementation doesn't support any custom sample formats */ + if( inputSampleFormat & paCustomFormat ) + return paSampleFormatNotSupported; + + /* unless alternate device specification is supported, reject the use of + paUseHostApiSpecificDeviceSpecification */ + + if( inputParameters->device == paUseHostApiSpecificDeviceSpecification ) + return paInvalidDevice; + + asioDeviceIndex = inputParameters->device; + + /* validate inputStreamInfo */ + if( inputParameters->hostApiSpecificStreamInfo ) + return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */ + } + else + { + inputChannelCount = 0; + } + + if( outputParameters ) + { + outputChannelCount = outputParameters->channelCount; + outputSampleFormat = outputParameters->sampleFormat; + + /* all standard sample formats are supported by the buffer adapter, + this implementation doesn't support any custom sample formats */ + if( outputSampleFormat & paCustomFormat ) + return paSampleFormatNotSupported; + + /* unless alternate device specification is supported, reject the use of + paUseHostApiSpecificDeviceSpecification */ + + if( outputParameters->device == paUseHostApiSpecificDeviceSpecification ) + return paInvalidDevice; + + asioDeviceIndex = outputParameters->device; + + /* validate outputStreamInfo */ + if( outputParameters->hostApiSpecificStreamInfo ) + return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */ + } + else + { + outputChannelCount = 0; + } + + + + /* if an ASIO device is open we can only get format information for the currently open device */ + + if( asioHostApi->openAsioDeviceIndex != paNoDevice + && asioHostApi->openAsioDeviceIndex != asioDeviceIndex ) + { + return paDeviceUnavailable; + } + + + /* NOTE: we load the driver and use its current settings + rather than the ones in our device info structure which may be stale */ + + /* open the device if it's not already open */ + if( asioHostApi->openAsioDeviceIndex == paNoDevice ) + { + result = LoadAsioDriver( asioHostApi->inheritedHostApiRep.deviceInfos[ asioDeviceIndex ]->name, + driverInfo, asioHostApi->systemSpecific ); + if( result != paNoError ) + return result; + } + + /* check that input device can support inputChannelCount */ + if( inputChannelCount > 0 ) + { + if( inputChannelCount > driverInfo->inputChannelCount ) + { + result = paInvalidChannelCount; + goto done; + } + } + + /* check that output device can support outputChannelCount */ + if( outputChannelCount ) + { + if( outputChannelCount > driverInfo->outputChannelCount ) + { + result = paInvalidChannelCount; + goto done; + } + } + + /* query for sample rate support */ + asioError = ASIOCanSampleRate( sampleRate ); + if( asioError == ASE_NoClock || asioError == ASE_NotPresent ) + { + result = paInvalidSampleRate; + goto done; + } + +done: + /* close the device if it wasn't already open */ + if( asioHostApi->openAsioDeviceIndex == paNoDevice ) + { + ASIOExit(); /* not sure if we should check for errors here */ + } + + if( result == paNoError ) + return paFormatIsSupported; + else + return result; +} + + + +/* PaAsioStream - a stream data structure specifically for this implementation */ + +typedef struct PaAsioStream +{ + PaUtilStreamRepresentation streamRepresentation; + PaUtilCpuLoadMeasurer cpuLoadMeasurer; + PaUtilBufferProcessor bufferProcessor; + + PaAsioHostApiRepresentation *asioHostApi; + unsigned long framesPerHostCallback; + + /* ASIO driver info - these may not be needed for the life of the stream, + but store them here until we work out how format conversion is going + to work. */ + + ASIOBufferInfo *asioBufferInfos; + ASIOChannelInfo *asioChannelInfos; + long inputLatency, outputLatency; // actual latencies returned by asio + + long inputChannelCount, outputChannelCount; + bool postOutput; + + void **bufferPtrs; /* this is carved up for inputBufferPtrs and outputBufferPtrs */ + void **inputBufferPtrs[2]; + void **outputBufferPtrs[2]; + + PaAsioBufferConverter *inputBufferConverter; + long inputShift; + PaAsioBufferConverter *outputBufferConverter; + long outputShift; + + volatile bool stopProcessing; + int stopPlayoutCount; + HANDLE completedBuffersPlayedEvent; + + bool streamFinishedCallbackCalled; + volatile int isActive; + volatile bool zeroOutput; /* all future calls to the callback will output silence */ + + volatile long reenterCount; + volatile long reenterError; + + PaStreamCallbackFlags callbackFlags; +} +PaAsioStream; + +static PaAsioStream *theAsioStream = 0; /* due to ASIO sdk limitations there can be only one stream */ + + +static void ZeroOutputBuffers( PaAsioStream *stream, long index ) +{ + int i; + + for( i=0; i < stream->outputChannelCount; ++i ) + { + void *buffer = stream->asioBufferInfos[ i + stream->inputChannelCount ].buffers[index]; + + int bytesPerSample = BytesPerAsioSample( stream->asioChannelInfos[ i + stream->inputChannelCount ].type ); + + memset( buffer, 0, stream->framesPerHostCallback * bytesPerSample ); + } +} + + +static unsigned long SelectHostBufferSize( unsigned long suggestedLatencyFrames, + PaAsioDriverInfo *driverInfo ) +{ + unsigned long result; + + if( suggestedLatencyFrames == 0 ) + { + result = driverInfo->bufferPreferredSize; + } + else{ + if( suggestedLatencyFrames <= (unsigned long)driverInfo->bufferMinSize ) + { + result = driverInfo->bufferMinSize; + } + else if( suggestedLatencyFrames >= (unsigned long)driverInfo->bufferMaxSize ) + { + result = driverInfo->bufferMaxSize; + } + else + { + if( driverInfo->bufferGranularity == -1 ) + { + /* power-of-two */ + result = 2; + + while( result < suggestedLatencyFrames ) + result *= result; + + if( result < (unsigned long)driverInfo->bufferMinSize ) + result = driverInfo->bufferMinSize; + + if( result > (unsigned long)driverInfo->bufferMaxSize ) + result = driverInfo->bufferMaxSize; + } + else if( driverInfo->bufferGranularity == 0 ) + { + /* the documentation states that bufferGranularity should be + zero when bufferMinSize, bufferMaxSize and + bufferPreferredSize are the same. We assume that is the case. + */ + + result = driverInfo->bufferPreferredSize; + } + else + { + /* modulo granularity */ + + unsigned long remainder = + suggestedLatencyFrames % driverInfo->bufferGranularity; + + if( remainder == 0 ) + { + result = suggestedLatencyFrames; + } + else + { + result = suggestedLatencyFrames + + (driverInfo->bufferGranularity - remainder); + + if( result > (unsigned long)driverInfo->bufferMaxSize ) + result = driverInfo->bufferMaxSize; + } + } + } + } + + return result; +} + + +/* see pa_hostapi.h for a list of validity guarantees made about OpenStream parameters */ + +static PaError OpenStream( struct PaUtilHostApiRepresentation *hostApi, + PaStream** s, + const PaStreamParameters *inputParameters, + const PaStreamParameters *outputParameters, + double sampleRate, + unsigned long framesPerBuffer, + PaStreamFlags streamFlags, + PaStreamCallback *streamCallback, + void *userData ) +{ + PaError result = paNoError; + PaAsioHostApiRepresentation *asioHostApi = (PaAsioHostApiRepresentation*)hostApi; + PaAsioStream *stream = 0; + unsigned long framesPerHostBuffer; + int inputChannelCount, outputChannelCount; + PaSampleFormat inputSampleFormat, outputSampleFormat; + PaSampleFormat hostInputSampleFormat, hostOutputSampleFormat; + unsigned long suggestedInputLatencyFrames; + unsigned long suggestedOutputLatencyFrames; + PaDeviceIndex asioDeviceIndex; + ASIOError asioError; + int asioIsInitialized = 0; + int asioBuffersCreated = 0; + int completedBuffersPlayedEventInited = 0; + int i; + PaAsioDriverInfo *driverInfo; + + /* unless we move to using lower level ASIO calls, we can only have + one device open at a time */ + if( asioHostApi->openAsioDeviceIndex != paNoDevice ) + return paDeviceUnavailable; + + if( inputParameters && outputParameters ) + { + /* full duplex ASIO stream must use the same device for input and output */ + + if( inputParameters->device != outputParameters->device ) + return paBadIODeviceCombination; + } + + if( inputParameters ) + { + inputChannelCount = inputParameters->channelCount; + inputSampleFormat = inputParameters->sampleFormat; + suggestedInputLatencyFrames = (unsigned long)(inputParameters->suggestedLatency * sampleRate); + + asioDeviceIndex = inputParameters->device; + + /* unless alternate device specification is supported, reject the use of + paUseHostApiSpecificDeviceSpecification */ + if( inputParameters->device == paUseHostApiSpecificDeviceSpecification ) + return paInvalidDevice; + + /* validate hostApiSpecificStreamInfo */ + if( inputParameters->hostApiSpecificStreamInfo ) + return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */ + } + else + { + inputChannelCount = 0; + inputSampleFormat = 0; + suggestedInputLatencyFrames = 0; + } + + if( outputParameters ) + { + outputChannelCount = outputParameters->channelCount; + outputSampleFormat = outputParameters->sampleFormat; + suggestedOutputLatencyFrames = (unsigned long)(outputParameters->suggestedLatency * sampleRate); + + asioDeviceIndex = outputParameters->device; + + /* unless alternate device specification is supported, reject the use of + paUseHostApiSpecificDeviceSpecification */ + if( outputParameters->device == paUseHostApiSpecificDeviceSpecification ) + return paInvalidDevice; + + /* validate hostApiSpecificStreamInfo */ + if( outputParameters->hostApiSpecificStreamInfo ) + return paIncompatibleHostApiSpecificStreamInfo; /* this implementation doesn't use custom stream info */ + } + else + { + outputChannelCount = 0; + outputSampleFormat = 0; + suggestedOutputLatencyFrames = 0; + } + + driverInfo = &asioHostApi->openAsioDriverInfo; + + /* NOTE: we load the driver and use its current settings + rather than the ones in our device info structure which may be stale */ + + result = LoadAsioDriver( asioHostApi->inheritedHostApiRep.deviceInfos[ asioDeviceIndex ]->name, + driverInfo, asioHostApi->systemSpecific ); + if( result == paNoError ) + asioIsInitialized = 1; + else + goto error; + + /* check that input device can support inputChannelCount */ + if( inputChannelCount > 0 ) + { + if( inputChannelCount > driverInfo->inputChannelCount ) + { + result = paInvalidChannelCount; + goto error; + } + } + + /* check that output device can support outputChannelCount */ + if( outputChannelCount ) + { + if( outputChannelCount > driverInfo->outputChannelCount ) + { + result = paInvalidChannelCount; + goto error; + } + } + + /* Set sample rate */ + if( ASIOSetSampleRate( sampleRate ) != ASE_OK ) + { + result = paInvalidSampleRate; + goto error; + } + + /* + IMPLEMENT ME: + - if a full duplex stream is requested, check that the combination + of input and output parameters is supported + */ + + /* validate platform specific flags */ + if( (streamFlags & paPlatformSpecificFlags) != 0 ) + return paInvalidFlag; /* unexpected platform specific flag */ + + + stream = (PaAsioStream*)PaUtil_AllocateMemory( sizeof(PaAsioStream) ); + if( !stream ) + { + result = paInsufficientMemory; + goto error; + } + + stream->completedBuffersPlayedEvent = CreateEvent( NULL, TRUE, FALSE, NULL ); + if( stream->completedBuffersPlayedEvent == NULL ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_SYSTEM_ERROR( GetLastError() ); + goto error; + } + completedBuffersPlayedEventInited = 1; + + + stream->asioBufferInfos = 0; /* for deallocation in error */ + stream->asioChannelInfos = 0; /* for deallocation in error */ + stream->bufferPtrs = 0; /* for deallocation in error */ + + if( streamCallback ) + { + PaUtil_InitializeStreamRepresentation( &stream->streamRepresentation, + &asioHostApi->callbackStreamInterface, streamCallback, userData ); + } + else + { + PaUtil_InitializeStreamRepresentation( &stream->streamRepresentation, + &asioHostApi->blockingStreamInterface, streamCallback, userData ); + } + + + PaUtil_InitializeCpuLoadMeasurer( &stream->cpuLoadMeasurer, sampleRate ); + + + stream->asioBufferInfos = (ASIOBufferInfo*)PaUtil_AllocateMemory( + sizeof(ASIOBufferInfo) * (inputChannelCount + outputChannelCount) ); + if( !stream->asioBufferInfos ) + { + result = paInsufficientMemory; + goto error; + } + + + for( i=0; i < inputChannelCount; ++i ) + { + ASIOBufferInfo *info = &stream->asioBufferInfos[i]; + + info->isInput = ASIOTrue; + info->channelNum = i; + info->buffers[0] = info->buffers[1] = 0; + } + + for( i=0; i < outputChannelCount; ++i ){ + ASIOBufferInfo *info = &stream->asioBufferInfos[inputChannelCount+i]; + + info->isInput = ASIOFalse; + info->channelNum = i; + info->buffers[0] = info->buffers[1] = 0; + } + + + framesPerHostBuffer = SelectHostBufferSize( + (( suggestedInputLatencyFrames > suggestedOutputLatencyFrames ) + ? suggestedInputLatencyFrames : suggestedOutputLatencyFrames), + driverInfo ); + + asioError = ASIOCreateBuffers( stream->asioBufferInfos, + inputChannelCount+outputChannelCount, + framesPerHostBuffer, &asioCallbacks_ ); + + if( asioError != ASE_OK + && framesPerHostBuffer != (unsigned long)driverInfo->bufferPreferredSize ) + { + /* + Some buggy drivers (like the Hoontech DSP24) give incorrect + [min, preferred, max] values They should work with the preferred size + value, thus if Pa_ASIO_CreateBuffers fails with the hostBufferSize + computed in SelectHostBufferSize, we try again with the preferred size. + */ + + framesPerHostBuffer = driverInfo->bufferPreferredSize; + + ASIOError asioError2 = ASIOCreateBuffers( stream->asioBufferInfos, + inputChannelCount+outputChannelCount, + framesPerHostBuffer, &asioCallbacks_ ); + if( asioError2 == ASE_OK ) + asioError = ASE_OK; + } + + if( asioError != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + + asioBuffersCreated = 1; + + stream->asioChannelInfos = (ASIOChannelInfo*)PaUtil_AllocateMemory( + sizeof(ASIOChannelInfo) * (inputChannelCount + outputChannelCount) ); + if( !stream->asioChannelInfos ) + { + result = paInsufficientMemory; + goto error; + } + + for( i=0; i < inputChannelCount + outputChannelCount; ++i ) + { + stream->asioChannelInfos[i].channel = stream->asioBufferInfos[i].channelNum; + stream->asioChannelInfos[i].isInput = stream->asioBufferInfos[i].isInput; + asioError = ASIOGetChannelInfo( &stream->asioChannelInfos[i] ); + if( asioError != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + } + + stream->bufferPtrs = (void**)PaUtil_AllocateMemory( + 2 * sizeof(void*) * (inputChannelCount + outputChannelCount) ); + if( !stream->bufferPtrs ) + { + result = paInsufficientMemory; + goto error; + } + + if( inputChannelCount > 0 ) + { + stream->inputBufferPtrs[0] = stream-> bufferPtrs; + stream->inputBufferPtrs[1] = &stream->bufferPtrs[inputChannelCount]; + + for( i=0; i<inputChannelCount; ++i ) + { + stream->inputBufferPtrs[0][i] = stream->asioBufferInfos[i].buffers[0]; + stream->inputBufferPtrs[1][i] = stream->asioBufferInfos[i].buffers[1]; + } + } + else + { + stream->inputBufferPtrs[0] = 0; + stream->inputBufferPtrs[1] = 0; + } + + if( outputChannelCount > 0 ) + { + stream->outputBufferPtrs[0] = &stream->bufferPtrs[inputChannelCount*2]; + stream->outputBufferPtrs[1] = &stream->bufferPtrs[inputChannelCount*2 + outputChannelCount]; + + for( i=0; i<outputChannelCount; ++i ) + { + stream->outputBufferPtrs[0][i] = stream->asioBufferInfos[inputChannelCount+i].buffers[0]; + stream->outputBufferPtrs[1][i] = stream->asioBufferInfos[inputChannelCount+i].buffers[1]; + } + } + else + { + stream->outputBufferPtrs[0] = 0; + stream->outputBufferPtrs[1] = 0; + } + + if( inputChannelCount > 0 ) + { + /* FIXME: assume all channels use the same type for now */ + ASIOSampleType inputType = stream->asioChannelInfos[0].type; + + hostInputSampleFormat = AsioSampleTypeToPaNativeSampleFormat( inputType ); + + SelectAsioToPaConverter( inputType, &stream->inputBufferConverter, &stream->inputShift ); + } + else + { + hostInputSampleFormat = 0; + stream->inputBufferConverter = 0; + } + + if( outputChannelCount > 0 ) + { + /* FIXME: assume all channels use the same type for now */ + ASIOSampleType outputType = stream->asioChannelInfos[inputChannelCount].type; + + hostOutputSampleFormat = AsioSampleTypeToPaNativeSampleFormat( outputType ); + + SelectPaToAsioConverter( outputType, &stream->outputBufferConverter, &stream->outputShift ); + } + else + { + hostOutputSampleFormat = 0; + stream->outputBufferConverter = 0; + } + + result = PaUtil_InitializeBufferProcessor( &stream->bufferProcessor, + inputChannelCount, inputSampleFormat, hostInputSampleFormat, + outputChannelCount, outputSampleFormat, hostOutputSampleFormat, + sampleRate, streamFlags, framesPerBuffer, + framesPerHostBuffer, paUtilFixedHostBufferSize, + streamCallback, userData ); + if( result != paNoError ) + goto error; + + + ASIOGetLatencies( &stream->inputLatency, &stream->outputLatency ); + + stream->streamRepresentation.streamInfo.inputLatency = + (double)( PaUtil_GetBufferProcessorInputLatency(&stream->bufferProcessor) + + stream->inputLatency) / sampleRate; // seconds + stream->streamRepresentation.streamInfo.outputLatency = + (double)( PaUtil_GetBufferProcessorOutputLatency(&stream->bufferProcessor) + + stream->outputLatency) / sampleRate; // seconds + stream->streamRepresentation.streamInfo.sampleRate = sampleRate; + + // the code below prints the ASIO latency which doesn't include the + // buffer processor latency. + PA_DEBUG(("PaAsio : ASIO InputLatency = %ld latency = %ld msec \n", + stream->inputLatency, + (long)((stream->inputLatency*1000)/ sampleRate))); + PA_DEBUG(("PaAsio : ASIO OuputLatency = %ld latency = %ld msec \n", + stream->outputLatency, + (long)((stream->outputLatency*1000)/ sampleRate))); + + stream->asioHostApi = asioHostApi; + stream->framesPerHostCallback = framesPerHostBuffer; + + stream->inputChannelCount = inputChannelCount; + stream->outputChannelCount = outputChannelCount; + stream->postOutput = driverInfo->postOutput; + stream->isActive = 0; + + asioHostApi->openAsioDeviceIndex = asioDeviceIndex; + + *s = (PaStream*)stream; + + return result; + +error: + if( stream ) + { + if( completedBuffersPlayedEventInited ) + CloseHandle( stream->completedBuffersPlayedEvent ); + + if( stream->asioBufferInfos ) + PaUtil_FreeMemory( stream->asioBufferInfos ); + + if( stream->asioChannelInfos ) + PaUtil_FreeMemory( stream->asioChannelInfos ); + + if( stream->bufferPtrs ) + PaUtil_FreeMemory( stream->bufferPtrs ); + + PaUtil_FreeMemory( stream ); + } + + if( asioBuffersCreated ) + ASIODisposeBuffers(); + + if( asioIsInitialized ) + ASIOExit(); + + return result; +} + + +/* + When CloseStream() is called, the multi-api layer ensures that + the stream has already been stopped or aborted. +*/ +static PaError CloseStream( PaStream* s ) +{ + PaError result = paNoError; + PaAsioStream *stream = (PaAsioStream*)s; + + /* + IMPLEMENT ME: + - additional stream closing + cleanup + */ + + PaUtil_TerminateBufferProcessor( &stream->bufferProcessor ); + PaUtil_TerminateStreamRepresentation( &stream->streamRepresentation ); + + stream->asioHostApi->openAsioDeviceIndex = paNoDevice; + + CloseHandle( stream->completedBuffersPlayedEvent ); + + PaUtil_FreeMemory( stream->asioBufferInfos ); + PaUtil_FreeMemory( stream->asioChannelInfos ); + PaUtil_FreeMemory( stream->bufferPtrs ); + PaUtil_FreeMemory( stream ); + + ASIODisposeBuffers(); + ASIOExit(); + + return result; +} + + +static void bufferSwitch(long index, ASIOBool directProcess) +{ +//TAKEN FROM THE ASIO SDK + + // the actual processing callback. + // Beware that this is normally in a seperate thread, hence be sure that + // you take care about thread synchronization. This is omitted here for + // simplicity. + + // as this is a "back door" into the bufferSwitchTimeInfo a timeInfo needs + // to be created though it will only set the timeInfo.samplePosition and + // timeInfo.systemTime fields and the according flags + + ASIOTime timeInfo; + memset( &timeInfo, 0, sizeof (timeInfo) ); + + // get the time stamp of the buffer, not necessary if no + // synchronization to other media is required + if( ASIOGetSamplePosition(&timeInfo.timeInfo.samplePosition, &timeInfo.timeInfo.systemTime) == ASE_OK) + timeInfo.timeInfo.flags = kSystemTimeValid | kSamplePositionValid; + + // Call the real callback + bufferSwitchTimeInfo( &timeInfo, index, directProcess ); +} + + +// conversion from 64 bit ASIOSample/ASIOTimeStamp to double float +#if NATIVE_INT64 + #define ASIO64toDouble(a) (a) +#else + const double twoRaisedTo32 = 4294967296.; + #define ASIO64toDouble(a) ((a).lo + (a).hi * twoRaisedTo32) +#endif + +static ASIOTime *bufferSwitchTimeInfo( ASIOTime *timeInfo, long index, ASIOBool directProcess ) +{ + // the actual processing callback. + // Beware that this is normally in a seperate thread, hence be sure that + // you take care about thread synchronization. + + + /* The SDK says the following about the directProcess flag: + suggests to the host whether it should immediately start processing + (directProcess == ASIOTrue), or whether its process should be deferred + because the call comes from a very low level (for instance, a high level + priority interrupt), and direct processing would cause timing instabilities for + the rest of the system. If in doubt, directProcess should be set to ASIOFalse. + + We just ignore directProcess. This could cause incompatibilities with + drivers which really don't want the audio processing to occur in this + callback, but none have been identified yet. + */ + + (void) directProcess; /* suppress unused parameter warning */ + +#if 0 + // store the timeInfo for later use + asioDriverInfo.tInfo = *timeInfo; + + // get the time stamp of the buffer, not necessary if no + // synchronization to other media is required + + if (timeInfo->timeInfo.flags & kSystemTimeValid) + asioDriverInfo.nanoSeconds = ASIO64toDouble(timeInfo->timeInfo.systemTime); + else + asioDriverInfo.nanoSeconds = 0; + + if (timeInfo->timeInfo.flags & kSamplePositionValid) + asioDriverInfo.samples = ASIO64toDouble(timeInfo->timeInfo.samplePosition); + else + asioDriverInfo.samples = 0; + + if (timeInfo->timeCode.flags & kTcValid) + asioDriverInfo.tcSamples = ASIO64toDouble(timeInfo->timeCode.timeCodeSamples); + else + asioDriverInfo.tcSamples = 0; + + // get the system reference time + asioDriverInfo.sysRefTime = get_sys_reference_time(); +#endif + +#if 0 + // a few debug messages for the Windows device driver developer + // tells you the time when driver got its interrupt and the delay until the app receives + // the event notification. + static double last_samples = 0; + char tmp[128]; + sprintf (tmp, "diff: %d / %d ms / %d ms / %d samples \n", asioDriverInfo.sysRefTime - (long)(asioDriverInfo.nanoSeconds / 1000000.0), asioDriverInfo.sysRefTime, (long)(asioDriverInfo.nanoSeconds / 1000000.0), (long)(asioDriverInfo.samples - last_samples)); + OutputDebugString (tmp); + last_samples = asioDriverInfo.samples; +#endif + + + if( !theAsioStream ) + return 0L; + + // Keep sample position + // FIXME: asioDriverInfo.pahsc_NumFramesDone = timeInfo->timeInfo.samplePosition.lo; + + + // protect against reentrancy + if( PaAsio_AtomicIncrement(&theAsioStream->reenterCount) ) + { + theAsioStream->reenterError++; + //DBUG(("bufferSwitchTimeInfo : reentrancy detection = %d\n", asioDriverInfo.reenterError)); + return 0L; + } + + int buffersDone = 0; + + do + { + if( buffersDone > 0 ) + { + // this is a reentered buffer, we missed processing it on time + // set the input overflow and output underflow flags as appropriate + + if( theAsioStream->inputChannelCount > 0 ) + theAsioStream->callbackFlags |= paInputOverflow; + + if( theAsioStream->outputChannelCount > 0 ) + theAsioStream->callbackFlags |= paOutputUnderflow; + } + else + { + if( theAsioStream->zeroOutput ) + { + ZeroOutputBuffers( theAsioStream, index ); + + // Finally if the driver supports the ASIOOutputReady() optimization, + // do it here, all data are in place + if( theAsioStream->postOutput ) + ASIOOutputReady(); + + if( theAsioStream->stopProcessing ) + { + if( theAsioStream->stopPlayoutCount < 2 ) + { + ++theAsioStream->stopPlayoutCount; + if( theAsioStream->stopPlayoutCount == 2 ) + { + theAsioStream->isActive = 0; + if( theAsioStream->streamRepresentation.streamFinishedCallback != 0 ) + theAsioStream->streamRepresentation.streamFinishedCallback( theAsioStream->streamRepresentation.userData ); + theAsioStream->streamFinishedCallbackCalled = true; + SetEvent( theAsioStream->completedBuffersPlayedEvent ); + } + } + } + } + else + { + +#if 0 +// test code to try to detect slip conditions... these may work on some systems +// but neither of them work on the RME Digi96 + +// check that sample delta matches buffer size (otherwise we must have skipped +// a buffer. +static double last_samples = -512; +double samples; +//if( timeInfo->timeCode.flags & kTcValid ) +// samples = ASIO64toDouble(timeInfo->timeCode.timeCodeSamples); +//else + samples = ASIO64toDouble(timeInfo->timeInfo.samplePosition); +int delta = samples - last_samples; +//printf( "%d\n", delta); +last_samples = samples; + +if( delta > theAsioStream->framesPerHostCallback ) +{ + if( theAsioStream->inputChannelCount > 0 ) + theAsioStream->callbackFlags |= paInputOverflow; + + if( theAsioStream->outputChannelCount > 0 ) + theAsioStream->callbackFlags |= paOutputUnderflow; +} + +// check that the buffer index is not the previous index (which would indicate +// that a buffer was skipped. +static int previousIndex = 1; +if( index == previousIndex ) +{ + if( theAsioStream->inputChannelCount > 0 ) + theAsioStream->callbackFlags |= paInputOverflow; + + if( theAsioStream->outputChannelCount > 0 ) + theAsioStream->callbackFlags |= paOutputUnderflow; +} +previousIndex = index; +#endif + + int i; + + PaUtil_BeginCpuLoadMeasurement( &theAsioStream->cpuLoadMeasurer ); + + PaStreamCallbackTimeInfo paTimeInfo; + + // asio systemTime is supposed to be measured according to the same + // clock as timeGetTime + paTimeInfo.currentTime = (ASIO64toDouble( timeInfo->timeInfo.systemTime ) * .000000001); + paTimeInfo.inputBufferAdcTime = paTimeInfo.currentTime - theAsioStream->streamRepresentation.streamInfo.inputLatency; + paTimeInfo.outputBufferDacTime = paTimeInfo.currentTime + theAsioStream->streamRepresentation.streamInfo.outputLatency; + +#if 1 +// detect underflows by checking inter-callback time > 2 buffer period +static double previousTime = -1; +if( previousTime > 0 ){ + + double delta = paTimeInfo.currentTime - previousTime; + + if( delta >= 2. * (theAsioStream->framesPerHostCallback / theAsioStream->streamRepresentation.streamInfo.sampleRate) ){ + if( theAsioStream->inputChannelCount > 0 ) + theAsioStream->callbackFlags |= paInputOverflow; + + if( theAsioStream->outputChannelCount > 0 ) + theAsioStream->callbackFlags |= paOutputUnderflow; + } +} +previousTime = paTimeInfo.currentTime; +#endif + + // note that the above input and output times do not need to be + // adjusted for the latency of the buffer processor -- the buffer + // processor handles that. + + if( theAsioStream->inputBufferConverter ) + { + for( i=0; i<theAsioStream->inputChannelCount; i++ ) + { + theAsioStream->inputBufferConverter( theAsioStream->inputBufferPtrs[index][i], + theAsioStream->inputShift, theAsioStream->framesPerHostCallback ); + } + } + + PaUtil_BeginBufferProcessing( &theAsioStream->bufferProcessor, &paTimeInfo, theAsioStream->callbackFlags ); + + /* reset status flags once they've been passed to the callback */ + theAsioStream->callbackFlags = 0; + + PaUtil_SetInputFrameCount( &theAsioStream->bufferProcessor, 0 /* default to host buffer size */ ); + for( i=0; i<theAsioStream->inputChannelCount; ++i ) + PaUtil_SetNonInterleavedInputChannel( &theAsioStream->bufferProcessor, i, theAsioStream->inputBufferPtrs[index][i] ); + + PaUtil_SetOutputFrameCount( &theAsioStream->bufferProcessor, 0 /* default to host buffer size */ ); + for( i=0; i<theAsioStream->outputChannelCount; ++i ) + PaUtil_SetNonInterleavedOutputChannel( &theAsioStream->bufferProcessor, i, theAsioStream->outputBufferPtrs[index][i] ); + + int callbackResult; + if( theAsioStream->stopProcessing ) + callbackResult = paComplete; + else + callbackResult = paContinue; + unsigned long framesProcessed = PaUtil_EndBufferProcessing( &theAsioStream->bufferProcessor, &callbackResult ); + + if( theAsioStream->outputBufferConverter ) + { + for( i=0; i<theAsioStream->outputChannelCount; i++ ) + { + theAsioStream->outputBufferConverter( theAsioStream->outputBufferPtrs[index][i], + theAsioStream->outputShift, theAsioStream->framesPerHostCallback ); + } + } + + PaUtil_EndCpuLoadMeasurement( &theAsioStream->cpuLoadMeasurer, framesProcessed ); + + // Finally if the driver supports the ASIOOutputReady() optimization, + // do it here, all data are in place + if( theAsioStream->postOutput ) + ASIOOutputReady(); + + if( callbackResult == paContinue ) + { + /* nothing special to do */ + } + else if( callbackResult == paAbort ) + { + /* finish playback immediately */ + theAsioStream->isActive = 0; + if( theAsioStream->streamRepresentation.streamFinishedCallback != 0 ) + theAsioStream->streamRepresentation.streamFinishedCallback( theAsioStream->streamRepresentation.userData ); + theAsioStream->streamFinishedCallbackCalled = true; + SetEvent( theAsioStream->completedBuffersPlayedEvent ); + theAsioStream->zeroOutput = true; + } + else /* paComplete or other non-zero value indicating complete */ + { + /* Finish playback once currently queued audio has completed. */ + theAsioStream->stopProcessing = true; + + if( PaUtil_IsBufferProcessorOuputEmpty( &theAsioStream->bufferProcessor ) ) + { + theAsioStream->zeroOutput = true; + theAsioStream->stopPlayoutCount = 0; + } + } + } + } + + ++buffersDone; + }while( PaAsio_AtomicDecrement(&theAsioStream->reenterCount) >= 0 ); + + return 0L; +} + + +static void sampleRateChanged(ASIOSampleRate sRate) +{ + // TAKEN FROM THE ASIO SDK + // do whatever you need to do if the sample rate changed + // usually this only happens during external sync. + // Audio processing is not stopped by the driver, actual sample rate + // might not have even changed, maybe only the sample rate status of an + // AES/EBU or S/PDIF digital input at the audio device. + // You might have to update time/sample related conversion routines, etc. + + (void) sRate; /* unused parameter */ +} + +static long asioMessages(long selector, long value, void* message, double* opt) +{ +// TAKEN FROM THE ASIO SDK + // currently the parameters "value", "message" and "opt" are not used. + long ret = 0; + + (void) message; /* unused parameters */ + (void) opt; + + switch(selector) + { + case kAsioSelectorSupported: + if(value == kAsioResetRequest + || value == kAsioEngineVersion + || value == kAsioResyncRequest + || value == kAsioLatenciesChanged + // the following three were added for ASIO 2.0, you don't necessarily have to support them + || value == kAsioSupportsTimeInfo + || value == kAsioSupportsTimeCode + || value == kAsioSupportsInputMonitor) + ret = 1L; + break; + + case kAsioBufferSizeChange: + //printf("kAsioBufferSizeChange \n"); + break; + + case kAsioResetRequest: + // defer the task and perform the reset of the driver during the next "safe" situation + // You cannot reset the driver right now, as this code is called from the driver. + // Reset the driver is done by completely destruct is. I.e. ASIOStop(), ASIODisposeBuffers(), Destruction + // Afterwards you initialize the driver again. + + /*FIXME: commented the next line out */ + //asioDriverInfo.stopped; // In this sample the processing will just stop + ret = 1L; + break; + + case kAsioResyncRequest: + // This informs the application, that the driver encountered some non fatal data loss. + // It is used for synchronization purposes of different media. + // Added mainly to work around the Win16Mutex problems in Windows 95/98 with the + // Windows Multimedia system, which could loose data because the Mutex was hold too long + // by another thread. + // However a driver can issue it in other situations, too. + ret = 1L; + break; + + case kAsioLatenciesChanged: + // This will inform the host application that the drivers were latencies changed. + // Beware, it this does not mean that the buffer sizes have changed! + // You might need to update internal delay data. + ret = 1L; + //printf("kAsioLatenciesChanged \n"); + break; + + case kAsioEngineVersion: + // return the supported ASIO version of the host application + // If a host applications does not implement this selector, ASIO 1.0 is assumed + // by the driver + ret = 2L; + break; + + case kAsioSupportsTimeInfo: + // informs the driver wether the asioCallbacks.bufferSwitchTimeInfo() callback + // is supported. + // For compatibility with ASIO 1.0 drivers the host application should always support + // the "old" bufferSwitch method, too. + ret = 1; + break; + + case kAsioSupportsTimeCode: + // informs the driver wether application is interested in time code info. + // If an application does not need to know about time code, the driver has less work + // to do. + ret = 0; + break; + } + return ret; +} + + +static PaError StartStream( PaStream *s ) +{ + PaError result = paNoError; + PaAsioStream *stream = (PaAsioStream*)s; + ASIOError asioError; + + if( stream->outputChannelCount > 0 ) + { + ZeroOutputBuffers( stream, 0 ); + ZeroOutputBuffers( stream, 1 ); + } + + PaUtil_ResetBufferProcessor( &stream->bufferProcessor ); + stream->stopProcessing = false; + stream->zeroOutput = false; + + /* Reentrancy counter initialisation */ + stream->reenterCount = -1; + stream->reenterError = 0; + + stream->callbackFlags = 0; + + if( ResetEvent( stream->completedBuffersPlayedEvent ) == 0 ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_SYSTEM_ERROR( GetLastError() ); + } + + if( result == paNoError ) + { + theAsioStream = stream; + asioError = ASIOStart(); + if( asioError == ASE_OK ) + { + stream->isActive = 1; + stream->streamFinishedCallbackCalled = false; + } + else + { + theAsioStream = 0; + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + } + } + + return result; +} + + +static PaError StopStream( PaStream *s ) +{ + PaError result = paNoError; + PaAsioStream *stream = (PaAsioStream*)s; + ASIOError asioError; + + if( stream->isActive ) + { + stream->stopProcessing = true; + + /* wait for the stream to finish playing out enqueued buffers. + timeout after four times the stream latency. + + @todo should use a better time out value - if the user buffer + length is longer than the asio buffer size then that should + be taken into account. + */ + if( WaitForSingleObject( theAsioStream->completedBuffersPlayedEvent, + (DWORD)(stream->streamRepresentation.streamInfo.outputLatency * 1000. * 4.) ) + == WAIT_TIMEOUT ) + { + PA_DEBUG(("WaitForSingleObject() timed out in StopStream()\n" )); + } + } + + asioError = ASIOStop(); + if( asioError != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + } + + theAsioStream = 0; + stream->isActive = 0; + + if( !stream->streamFinishedCallbackCalled ) + { + if( stream->streamRepresentation.streamFinishedCallback != 0 ) + stream->streamRepresentation.streamFinishedCallback( stream->streamRepresentation.userData ); + } + + return result; +} + + +static PaError AbortStream( PaStream *s ) +{ + PaError result = paNoError; + PaAsioStream *stream = (PaAsioStream*)s; + ASIOError asioError; + + stream->zeroOutput = true; + + asioError = ASIOStop(); + if( asioError != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + } + else + { + // make sure that the callback is not still in-flight when ASIOStop() + // returns. This has been observed to happen on the Hoontech DSP24 for + // example. + int count = 2000; // only wait for 2 seconds, rather than hanging. + while( theAsioStream->reenterCount != -1 && count > 0 ) + { + Sleep(1); + --count; + } + } + + /* it is questionable whether we should zero theAsioStream if ASIOStop() + returns an error, because the callback could still be active. We assume + not - this is based on the fact that ASIOStop is unlikely to fail + if the callback is running - it's more likely to fail because the + callback is not running. */ + + theAsioStream = 0; + stream->isActive = 0; + + if( !stream->streamFinishedCallbackCalled ) + { + if( stream->streamRepresentation.streamFinishedCallback != 0 ) + stream->streamRepresentation.streamFinishedCallback( stream->streamRepresentation.userData ); + } + + return result; +} + + +static PaError IsStreamStopped( PaStream *s ) +{ + //PaAsioStream *stream = (PaAsioStream*)s; + (void) s; /* unused parameter */ + return theAsioStream == 0; +} + + +static PaError IsStreamActive( PaStream *s ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + return stream->isActive; +} + + +static PaTime GetStreamTime( PaStream *s ) +{ + (void) s; /* unused parameter */ + return (double)timeGetTime() * .001; +} + + +static double GetStreamCpuLoad( PaStream* s ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + return PaUtil_GetCpuLoad( &stream->cpuLoadMeasurer ); +} + + +/* + As separate stream interfaces are used for blocking and callback + streams, the following functions can be guaranteed to only be called + for blocking streams. +*/ + +static PaError ReadStream( PaStream* s, + void *buffer, + unsigned long frames ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + /* IMPLEMENT ME, see portaudio.h for required behavior*/ + (void) stream; /* unused parameters */ + (void) buffer; + (void) frames; + + return paNoError; +} + + +static PaError WriteStream( PaStream* s, + const void *buffer, + unsigned long frames ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + /* IMPLEMENT ME, see portaudio.h for required behavior*/ + (void) stream; /* unused parameters */ + (void) buffer; + (void) frames; + + return paNoError; +} + + +static signed long GetStreamReadAvailable( PaStream* s ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + /* IMPLEMENT ME, see portaudio.h for required behavior*/ + (void) stream; /* unused parameter */ + + return 0; +} + + +static signed long GetStreamWriteAvailable( PaStream* s ) +{ + PaAsioStream *stream = (PaAsioStream*)s; + + /* IMPLEMENT ME, see portaudio.h for required behavior*/ + (void) stream; /* unused parameter */ + + return 0; +} + + +PaError PaAsio_ShowControlPanel( PaDeviceIndex device, void* systemSpecific ) +{ + PaError result = paNoError; + PaUtilHostApiRepresentation *hostApi; + PaDeviceIndex hostApiDevice; + ASIODriverInfo asioDriverInfo; + ASIOError asioError; + int asioIsInitialized = 0; + PaAsioHostApiRepresentation *asioHostApi; + PaAsioDeviceInfo *asioDeviceInfo; + + + result = PaUtil_GetHostApiRepresentation( &hostApi, paASIO ); + if( result != paNoError ) + goto error; + + result = PaUtil_DeviceIndexToHostApiDeviceIndex( &hostApiDevice, device, hostApi ); + if( result != paNoError ) + goto error; + + /* + In theory we could proceed if the currently open device was the same + one for which the control panel was requested, however because the + window pointer is not available until this function is called we + currently need to call ASIOInit() again here, which of course can't be + done safely while a stream is open. + */ + + asioHostApi = (PaAsioHostApiRepresentation*)hostApi; + if( asioHostApi->openAsioDeviceIndex != paNoDevice ) + { + result = paDeviceUnavailable; + goto error; + } + + asioDeviceInfo = (PaAsioDeviceInfo*)hostApi->deviceInfos[hostApiDevice]; + + if( !loadAsioDriver( const_cast<char*>(asioDeviceInfo->commonDeviceInfo.name) ) ) + { + result = paUnanticipatedHostError; + goto error; + } + + /* CRUCIAL!!! */ + memset( &asioDriverInfo, 0, sizeof(ASIODriverInfo) ); + asioDriverInfo.asioVersion = 2; + asioDriverInfo.sysRef = systemSpecific; + asioError = ASIOInit( &asioDriverInfo ); + if( asioError != ASE_OK ) + { + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + else + { + asioIsInitialized = 1; + } + +PA_DEBUG(("PaAsio_ShowControlPanel: ASIOInit(): %s\n", PaAsio_GetAsioErrorText(asioError) )); +PA_DEBUG(("asioVersion: ASIOInit(): %ld\n", asioDriverInfo.asioVersion )); +PA_DEBUG(("driverVersion: ASIOInit(): %ld\n", asioDriverInfo.driverVersion )); +PA_DEBUG(("Name: ASIOInit(): %s\n", asioDriverInfo.name )); +PA_DEBUG(("ErrorMessage: ASIOInit(): %s\n", asioDriverInfo.errorMessage )); + + asioError = ASIOControlPanel(); + if( asioError != ASE_OK ) + { + PA_DEBUG(("PaAsio_ShowControlPanel: ASIOControlPanel(): %s\n", PaAsio_GetAsioErrorText(asioError) )); + result = paUnanticipatedHostError; + PA_ASIO_SET_LAST_ASIO_ERROR( asioError ); + goto error; + } + +PA_DEBUG(("PaAsio_ShowControlPanel: ASIOControlPanel(): %s\n", PaAsio_GetAsioErrorText(asioError) )); + + 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; +} + diff --git a/pd/portaudio/pa_asio/pa_asio.h b/pd/portaudio/pa_asio/pa_asio.h new file mode 100644 index 00000000..aed6f07b --- /dev/null +++ b/pd/portaudio/pa_asio/pa_asio.h @@ -0,0 +1,79 @@ +#ifndef PA_ASIO_H +#define PA_ASIO_H +/* + * $Id: pa_asio.h,v 1.1.2.5 2003/09/20 21:06:44 rossbencina 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 */ |