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138 lines
4.2 KiB
Plaintext
138 lines
4.2 KiB
Plaintext
ASIO-README.txt
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This document contains information to help you compile PortAudio with
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ASIO support. If you find any omissions or errors in this document
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please notify Ross Bencina <rossb@audiomulch.com>.
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Building PortAudio with ASIO support
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------------------------------------
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To build PortAudio with ASIO support you need to compile and link with
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pa_asio.c, and files from the ASIO SDK (see below), along with the common
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files from pa_common/ and platform specific files from pa_win/ (for Win32)
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or pa_mac/ (for Macintosh).
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If you are compiling with a non-Microsoft compiler on windows, also
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compile and link with iasiothiscallresolver.cpp (see below for
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an explanation).
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For some platforms (MingW, possibly Mac), you may simply
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be able to type:
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./configure --with-host_os=mingw --with-winapi=asio [--with-asiodir=/usr/local/asiosdk2]
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make
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./configure --with-host_os=darwin --with-winapi=asio [--with-asiodir=/usr/local/asiosdk2]
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make
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and life will be good.
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Obtaining the ASIO SDK
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----------------------
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In order to build PortAudio with ASIO support, you need to download
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the ASIO SDK (version 2.0) from Steinberg. Steinberg makes the ASIO
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SDK available to anyone free of charge, however they do not permit its
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source code to be distributed.
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NOTE: In some cases the ASIO SDK may require patching, see below
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for further details.
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http://www.steinberg.net/en/ps/support/3rdparty/asio_sdk/
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If the above link is broken search Google for:
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"download steinberg ASIO SDK"
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Building the ASIO SDK on Macintosh
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----------------------------------
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To build the ASIO SDK on Macintosh you need to compile and link with the
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following files from the ASIO SDK:
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host/asiodrivers.cpp
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host/mac/asioshlib.cpp
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host/mac/codefragements.cpp
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Building the ASIO SDK on Windows
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--------------------------------
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To build the ASIO SDK on Windows you need to compile and link with the
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following files from the ASIO SDK:
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asio_sdk\common\asio.cpp
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asio_sdk\host\asiodrivers.cpp
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asio_sdk\host\pc\asiolist.cpp
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You may also need to adjust your include paths to support inclusion of
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header files from the above directories.
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The ASIO SDK depends on the following COM API functions:
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CoInitialize, CoUninitialize, CoCreateInstance, CLSIDFromString
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For compilation with MinGW you will need to link with -lole32, for
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Borland link with Import32.lib.
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Non-Microsoft (MSVC) Compilers on Windows including Borland and GCC
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-------------------------------------------------------------------
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Steinberg did not specify a calling convention in the IASIO interface
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definition. This causes the Microsoft compiler to use the proprietary
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thiscall convention which is not compatible with other compilers, such
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as compilers from Borland (BCC and C++Builder) and GNU (gcc).
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Steinberg's ASIO SDK will compile but crash on initialization if
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compiled with a non-Microsoft compiler on Windows.
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PortAudio solves this problem using the iasiothiscallresolver library
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which is included in the distribution. When building ASIO support for
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non-Microsoft compilers, be sure to compile and link with
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iasiothiscallresolver.cpp. Note that iasiothiscallresolver includes
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conditional directives which cause it to have no effect if it is
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compiled with a Microsoft compiler, or on the Macintosh.
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If you use configure and make (see above), this should be handled
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automatically for you.
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For further information about the IASIO thiscall problem see this page:
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http://www.audiomulch.com/~rossb/code/calliasio
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Macintosh ASIO SDK Bug Patch
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----------------------------
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There is a bug in the ASIO SDK that causes the Macintosh version to
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often fail during initialization. Below is a patch that you can apply.
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In codefragments.cpp replace getFrontProcessDirectory function with
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the following one (GetFrontProcess replaced by GetCurrentProcess).
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bool CodeFragments::getFrontProcessDirectory(void *specs)
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{
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FSSpec *fss = (FSSpec *)specs;
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ProcessInfoRec pif;
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ProcessSerialNumber psn;
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memset(&psn,0,(long)sizeof(ProcessSerialNumber));
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// if(GetFrontProcess(&psn) == noErr) // wrong !!!
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if(GetCurrentProcess(&psn) == noErr) // correct !!!
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{
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pif.processName = 0;
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pif.processAppSpec = fss;
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pif.processInfoLength = sizeof(ProcessInfoRec);
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if(GetProcessInformation(&psn, &pif) == noErr)
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return true;
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}
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return false;
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}
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---
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