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+
+                      HOW TO ACTIVATE LIBSAMPLERATE 
+                      (a.k.a SRC/Secret Rabbit Code)
+                AS PJMEDIA'S SAMPLE RATE CONVERSION BACKEND
+
+                                   by
+                              Benny Prijono
+                                  PJSIP
+
+Background
+----------
+   Secret Rabbit Code (aka libsamplerate) is a sample rate conversion
+   library, available from http://www.mega-nerd.com/SRC/index.html.
+   It is licensed under dual license, GPL and proprietary.
+
+   
+Supported Platforms
+-------------------
+   libsamplerate is available for Win32 with Visual Studio and the
+   Makefile based targets (such as Linux, MacOS X, *nix, etc.).
+
+   It's not supported for WinCE/Windows Mobile and Symbian since it is
+   a floating point based implementation.
+
+   
+Installation
+------------
+   - Download libsamplerate from http://www.mega-nerd.com/SRC/index.html
+
+   - Untar libsamplerate-0.1.2.tar.gz into third_party directory
+       cd third_party
+       tar xzf libsamplerate-0.1.2.tar.gz
+
+   - Rename libsamplerate-0.1.2 directory name to libsamplerate
+       On Windows:
+          ren libsamplerate-0.1.2 libsamplerate
+
+       On Linux/Unix/MacOS X:
+          mv libsamplerate-0.1.2 libsamplerate
+
+
+Visual Studio Build
+-------------------
+   For Visual Studio projects, only static linkage is supported 
+   by PJMEDIA build system. If dynamic linking is desired, edit
+   pjmedia/src/pjmedia/resample_libresample.c to prevent it from
+   linking with the static library, and configure your project
+   to link with libsamplerate DLL library.
+ 
+   To build libresample static library with Visual Studio:
+
+      - Open third_party/build/samplerate/libsamplerate_static.dsp
+      - Build the project for both Debug and Release build
+
+
+   libresample dynamic library can be produced by following the
+   instructions in libresample source directory.
+   
+
+Makefile build
+--------------
+   - Build and install libsamplerate (configure && make && make install).
+     Please follow the instructions in libsamplerate documentation.
+
+   - Re-run PJSIP's "configure" script with this option:
+
+       ./configure --enable-libsamplerate
+
+     this will detect the presence of libsamplerate library and add it
+     to the input library list.
+
+
+Enabling libsamplerate for PJMEDIA's resample
+---------------------------------------------
+    For both Visual Studio and Makefile based build system, add this in 
+    config_site.h:
+
+      #define PJMEDIA_RESAMPLE_IMP PJMEDIA_RESAMPLE_LIBSAMPLERATE
+
+
+Limitations
+-----------
+Sample rate 22050 Hz is only supported with 20ms ptime, and sample rate 11025 Hz is only supported with 40ms ptime. This is the limitation of PJMEDIA rather than libsamplerate.
+
+