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Update documentation for MSVC solution. Add experimental speexdsp effect to MSVC build.

--- a/msvc9/Readme.txt

+++ b/msvc9/Readme.txt

@@ -1,10 +1,10 @@

 This directory includes hand-crafted project files for building SoX under

 MSVC9. The project files may be replaced by expanding CMAKE support in the

-future, but for now, this is the best build of SoX currently available on

-Windows. The resulting sox.exe has support for all SoX features except magic,

-ffmpeg, and pulseaudio. LAME (libmp3lame.dll or lame_enc.dll), MAD (libmad.dll

-or cygmad-0.dll) and AMR support (libamrnb-3.dll, libamrwb-3.dll) are loaded

-at runtime if they are available.

+future, but for now, this is the easiest way to build SoX with MS Visual C++.

+The resulting sox.exe has support for all SoX features except magic, ffmpeg,

+and pulseaudio. LAME (libmp3lame.dll or lame_enc.dll), MAD (libmad.dll or

+cygmad-0.dll), libsndfile (libsndfile-1.dll) and AMR support (libamrnb-3.dll,

+libamrwb-3.dll) are loaded at runtime if they are available.

 How to build:

@@ -20,6 +20,7 @@

    -- libpng-1.2.39-no-config.tar.gz extracted into directory libpng

    -- libsndfile-1.0.20.tar.gz extracted into directory libsndfile

    -- libvorbis-1.2.3.tar.gz extracted into directory libvorbis

+   -- speex-1.2rc1.tar.gz extracted into directory speex

    -- wavpack-4.50.1.tar.gz extracted into directory wavpack

    -- zlib-1.2.3.tar.gz extracted into directory zlib

@@ -34,9 +35,9 @@

 6. The resulting executable files will be in sox\msvc9\Debug or

    sox\msvc9\Release. The resulting sox.exe will dynamically link to

-   libmp3lame.dll, libmad.dll, libamrnb-3.dll, and libamrwb-3.dll if they are

-   available, but will run without them (though the corresponding features will

-   be unavailable if they are not present).

+   libmp3lame.dll, libmad.dll, libsndfile-1.dll, libamrnb-3.dll, and

+   libamrwb-3.dll if they are available, but will run without them (though the

+   corresponding features will be unavailable if they are not present).

 Points to note:

@@ -47,6 +48,13 @@

   sndfile.h, so you should not create a sndfile.h under the libsndfile folder.

   To repeat: you should extract a clean copy of libsndfile-1.0.20.tar.gz, and

   should not add, process, or rename any files.

+

+- The solution includes an experimental effect called speexdsp that uses the

+  speex DSP library. This does not yet enable any support for the speex file

+  format or speex codec. The speexdsp effect is simply an experimental effect

+  to make use of the automatic gain control and noise filtering components that

+  are part of the speex codec package. Support for the speex codec may be added

+  later.

 - The included libsox project enables OpenMP support. You can disable this

   in the libsox project properties under Configuration Properties, C/C++,

--- a/msvc9/Sox/soxconfig.h

+++ b/msvc9/Sox/soxconfig.h

@@ -85,6 +85,7 @@

 #define HAVE_IO_H 1

 #define HAVE_MEMORY_H 1

 #define HAVE_POPEN 1

+#define HAVE_SPEEXDSP 1

 #define HAVE_STDLIB_H 1

 #define HAVE_STRDUP 1

 #define HAVE_STRING_H 1