Making VST plugins with MinGW

MinGW + MSYSでVST Plug-inを作る方法とサンプル。 Freeverb3@sourceforge.netではこれを利用したソースコードをGPLで配布しています。

必要なもの

落とし穴やその他

configure.inでは、AC_LIBTOOL_WIN32_DLLがAM_PROG_LIBTOOLの前に必要です。

MinGWでは、 __declspec(dllexport)マクロによる関数EXPORTをサポートしています。 -fPICは必要ありません。PEはすべてがposition independentです。

mainをエクスポートすることができないコンパイラが多くあります。多くは以下のようなエラーメッセージを吐いて止まります。

FreeverbMain.cpp:31: error: `main' must return `int'
FreeverbMain.cpp:32: error: `main' must return `int'
FreeverbMain.cpp: In function `int main(...)':
FreeverbMain.cpp:32: error: declaration of C function `int main(...)' conflicts with
FreeverbMain.cpp:31: error: previous declaration `AEffect* main(VstIntPtr (*)(AEffect*, VstInt32, VstInt32, VstIntPtr, void*, float))' here
FreeverbMain.cpp: In function `int main(...)':
FreeverbMain.cpp:32: error: `VSTPluginMain' was not declared in this scope

Windows DLLでは、同じ関数を別名でDEFファイルによりEXPORTする方法があるのでそれを利用しましょう。

Freeverb4.def

Makefile.am

objdump -x Freeverb4.dll

.edata の 0x6aa51000 に export テーブルがあります

Export テーブル (.edata セクションの内容を解釈)

Export フラグ                   0
時刻/日付スタンプ               45d9f339
Major/Minor                     0/0
名前                            000000000001103c Freeverb4.dll
序数ベース                      1
各種の数値:
        Export アドレステーブル         00000002
        [名前ポインタ/序数] テーブル    00000002
テーブルアドレス
        Export アドレステーブル         0000000000011028
        名前ポインタテーブル            0000000000011030
        序数テーブル                    0000000000011038

Export アドレステーブル -- 序数ベース 1
        [   0] +base[   1] 19e0 Export RVA
        [   1] +base[   2] 19e0 Export RVA

[序数/名前ポインタ] テーブル
        [   0] VSTPluginMain
        [   1] main

サンプル

  <Su-Shee>  rindolf: yes, I played with Squeak a little and yes I'd like
             a vim clone written in perl.
  <Makoryu>  Why isn't there one already, then?
  <Makoryu>  (A vim clone in Perl)
  <Su-Shee>  good question. there's one in javascript :)
  <rindolf>  Su-Shee: actually , it's a vi clone.
  <rindolf>  Writing a vi clone is much easier than writing a vim clone.
  <rindolf>  Just like writing a Scheme clone is much easier than writing
             a Perl 6 implementation.
  <rindolf>  Unless you're Chuck Norris.
  <Su-Shee>  rindolf: darn.. he already wrote a vim in perl6?
  <moritz_>  no, he scared K&R into writing it ;-)
  <rindolf>  Su-Shee: Chuck Norris is the ghost author of the entire
             Debian GNU/Linux distribution.
  <rindolf>  Su-Shee: and he wrote it in 24 hours, while taking snack
             breaks.
  <Su-Shee>  rindolf: yes, I know - he published slackware under the
             pseudonym patrick volkerding...
  <rindolf>  Chuck Norris read the entire Wikipedia. Twice.
   <araujo>  the second time includes fixing all its errors
  <moritz_>  but he didn't commmit his changes, it seems
  <rindolf>  moritz_: heh.
  <rindolf>  LOL.
   <araujo>  Chuck Norris doesn't commit changes, the changes commit for
             him
   <araujo>  :)
  <rindolf>  Code is too scared of Chuck to be wrong.
  <rindolf>  It is generated right in the first time.
  <rindolf>  Bugs are too afraid to reproduce on Chuck Norris' computer.
  <Su-Shee>  .o(I see a chuck norris release on the horizon... ;)
  <rindolf>  Su-Shee: :-)
  <Su-Shee>  we could ask chuck norris if he's willing to promote the star
             release.. ;)) (which probably kill the entire internet due to
             laughter.. :)
   <araujo>  Perl 6 - A Chuck Norris like language
 <dukeleto>  Chuck Norris has actually been using Perl 6 since 1987, and
             has been waiting for Larry to play catch-up. :)
  <rindolf>  dukeleto: LOL.
  <rindolf>  Perl 6 - Kicks ass like Chuck.
  <Su-Shee>  rakudo - chuck's choice ;)
  <Su-Shee>  well, camelia and chuck norris go well together. ;)
  <rindolf>  OK.
  <rindolf>  Of course everybody know Chuck Norris is a real programmer.
  <rindolf>  He designs machines by combining individual atoms.
  <rindolf>  Using his thought.
  <rindolf>  Atoms obey Chuck Norris.
  <Su-Shee>  rindolf: you obviously have been starved and deprived of
             super hero comics in your childhood :)

    -- What you could assume was true about Chuck Norris
    -- #perl6, Freenode

Writing a BitKeeper replacement is probably easier at this point than getting
its license changed.

Matt Mackall on OFTC.net #offtopic.

P.S: Matt Mackall have eventually projected Mercurial, which aims to be a
BitKeeper replacement.

    -- Matt Mackal

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