Update build notes

BUILDING.md

@@ -1,10 +1,17 @@
 # Building rtl_433
 
-## Linux
+rtl_433 currently supports these input types:
+* [RTL-SDR](http://sdr.osmocom.org/trac/wiki/rtl-sdr) (optional, recommended)
+* [SoapySDR](https://github.com/pothosware/SoapySDR/wiki) (optional)
+* files: CU8, CS16, CF32 I/Q data, U16 AM data (built-in)
+* rtl_tcp remote data servers (built-in)
 
-Compiling rtl_433 requires [rtl-sdr](http://sdr.osmocom.org/trac/wiki/rtl-sdr) to be installed.
+Building rtl_433 with RTL-SDR or SoapySDR support is optional but using RTL-SDR is highly recommended.
+The libraries and header files for RTL-SDR and/or SoapySDR should be installed beforehand.
 
-Depending on your system, you may also need to install the following libraries.
+## Linux / Mac OS X
+
+Depending on your system, you may need to install the following libraries.
 
 Debian:
 
@@ -14,20 +21,28 @@ Centos/Fedora/RHEL (for Centos/RHEL with enabled EPEL):
 
     sudo dnf install libtool libusb-devel rtl-sdr-devel rtl-sdr
 
+Mac OS X with MacPorts:
+
+    sudo port install rtl-sdr cmake
+
+Mac OS X with Homebrew:
+
+    brew install rtl-sdr cmake
+
 ### CMake
 
-Installation using cmake:
+Installation using CMake:
 
     cd rtl_433/
     mkdir build
     cd build
-    cmake ../
+    cmake ..
     make
     make install
 
-### autoconf
+### Autotools (Autoconf, Automake)
 
-Installation using autoconf:
+Installation using Autotools:
 
     cd rtl_433/
     autoreconf --install
@@ -39,9 +54,9 @@ The final 'make install' step should be run as a user with appropriate permissio
 
 ## Windows
 
-### mingw-w64
+### MinGW-w64
 
-You'll need librtlsdr and libusb, they are dependencies for rtl_433.
+You'll probably want librtlsdr and libusb.
 
 libusb has prebuilt binaries for windows, 
 librtlsdr needs to be built (at least for the latest version, some binaries 
@@ -51,8 +66,8 @@ of older versions seem to be floating around)
 
 taken and adapted from here: https://www.onetransistor.eu/2017/03/compile-librtlsdr-windows-mingw.html
 
-* install mingw-w64 (https://mingw-w64.org/) and cmake (https://cmake.org/)
-    * it's easiest if you select the option to include cmake in your path, otherwise you'll need to do this manually
+* install [MinGW-w64](https://mingw-w64.org/) and [CMake](https://cmake.org/)
+    * it's easiest if you select the option to include CMake in your path, otherwise you'll need to do this manually
 * download the libusb binaries from https://sourceforge.net/projects/libusb/files/libusb-1.0/ or from https://libusb.info/
     * take the latest release and then download the .7z file, the other file contains the sources (or 'windows binaries' on the .info website)
 * extract the archive and open the extracted folder
@@ -61,7 +76,7 @@ taken and adapted from here: https://www.onetransistor.eu/2017/03/compile-librtl
 * copy the `mingw64/dll/libusb-1.0.dll` file to `<mingw_installation_folder>/bin`
 * download the source code of librtlsdr https://github.com/steve-m/librtlsdr
 * go into the librtlsdr folder
-* open cmakelists.txt with an editor that knows unix line endings
+* open CMakeLists.txt with an editor that knows unix line endings
 * go to `# Find build dependencies` (around line 65) and comment/remove the line with `find_package(Threads)`
 * add the following lines instead:
 
@@ -80,7 +95,7 @@ SET(THREADS_FOUND TRUE)
 /usr/local/include
 ```
 
-* add some extra lines to point to the mingw include folder where you extracted libusb-1.0, making it look like this
+* add some extra lines to point to the MinGW include folder where you extracted libusb-1.0, making it look like this
     * take note of the "" around the folder names, these are needed when there are spaces in the folder name
     * you'll need to find out the exact paths for your system
 
@@ -92,9 +107,9 @@ SET(THREADS_FOUND TRUE)
 "C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/include/libusb-1.0"
 ```
 
-* open a mingw terminal in the librtlsdr folder
+* open a MinGW terminal in the librtlsdr folder
 * create build folder and go into it: `mkdir build && cd build`
-* generate makefiles for mingw: `cmake -G "MinGW Makefiles" ..`
+* generate makefiles for MinGW: `cmake -G "MinGW Makefiles" ..`
 * build the librtlsdr library: `mingw32-make`
 
 #### rtl_433
@@ -110,9 +125,28 @@ SET(THREADS_FOUND TRUE)
 * point the `LIBRTLSDR_INCLUDE_DIRS` to the include folder of the librtlsdr source
 * point the `LIBRTLSDR_LIBRARIES` to the `librtlsdr.dll.a` file in the <librtlsdr_source>/build/src folder
     * that's the one you've built earlier
-* edit `CMAKE_C_STANDARD_LIBRARIES` to include `-lws2_32` (this is for winsocks2)
-* start a mingw terminal and run `mingw32-make` to build
-    * when something in the tests folder doesn't build, you can disable it by commenting out `add_subdirectory(tests)` in the cmakelists.txt file in the source folder of rtl_433
+* start a MinGW terminal and run `mingw32-make` to build
+    * when something in the tests folder doesn't build, you can disable it by commenting out `add_subdirectory(tests)` in the CMakeLists.txt file in the source folder of rtl_433
 * rtl_433.exe should be built now
 * you need to place it in the same folder as librtlsdr.dll and libusb-1.0.dll (you should have seen both of them by now)
 * good luck!
+
+### Visual Studio 2017 CMake MSBuild
+
+    cd rtl_433
+    mkdir build
+    cd build
+    cmake -G "Visual Studio 15 2017 Win64" ..
+    MSBuild.exe rtl433.sln
+
+* -or- open the `rtl433.sln`
+
+### Visual Studio 2017 supplied project/solution
+
+* Open the `rtl_433.sln` from the `vs15` folder -or-
+
+    cd rtl_433
+    cd vs15
+    MSBuild.exe rtl_433.sln
+
+If your system is missing or you find these steps are outdated please PR an update or open an issue.