Updated Windows build instructions with the pthread-win32 dependency

Build-Windows.md

@@ -88,23 +88,49 @@ Configure variables to indicate CubicSDR that modules files will be searched in
 
 # Build Support Modules and dependencies
 
-## Getting or Building low-level dependencies (`libusb`, `librtlsdr`...)
+## Getting or building low-level dependencies
 
-`libusb` is a low-level USB 'driver' used by the `librtlsdr` used in turn by the SoapySDR module below to talk to the hardware. There are 2 way to get them:
+SoapySDR modules need hardware-specific libraries to communicate with the hardware. Such libraries either come from Open Source Software or are provided by the hardware vendor. 
+For instance, 
+* SoapyRTLSDR needs:
+  -  `pthreads-win32` : POSIX threads emulation for Windows,
+  -  `libusb` : low-level USB 'driver',
+  -  `librtlsdr` which use the 2 libraries above to communicate with the RTL-SDR device. 
+
+* SoapySDRPlay needs:
+  -  `mir_sdr_api` : SDRPlay provides binaries for most common platforms (see SoapySDRPlay section below)
+ 
+### pthreads-win32
+* Download the ZIP of pre-compiled binaries from ftp://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip 
+* Unpack it as the following:
+````
+C:\MSVCDev\pthreads-win32\lib\x64\pthreadVC2.lib
+C:\MSVCDev\pthreads-win32\include\*.h
+C:\MSVCDev\pthreads-win32\dll\x64\pthreadVC2.dll
+````
+
+Copy the file `pthreadVC2.dll` in the `C:\MSVCDev\CubicSDR_win64\x64\` directory where CubicSDR can find it.
+
+### libusb
 
 Easiest way: use a pre-compiled `librtlsdr` binary which also package `libusb` from the [librtlsdr Releases](https://github.com/librtlsdr/librtlsdr/releases) page and choose the "x64" version.
+Or compile it from source:
 
-Or re-compile both libraries : (not complete)
+* Clone or download https://github.com/libusb/libusb to C:\MSVCDev\libusb
+* Build it using `C:\MSVCDev\libusb\msvc\libusb_2017.sln` choosing the `Release` and `x64` configuration.
+
+Copy the file `libusb-1.0.dll` in the `C:\MSVCDev\CubicSDR_win64\x64\` directory where CubicSDR can find it.
+
+### librtlsdr
 
-* Clone or download https://github.com/libusb/libusb to C:\MSVCDev\libusb and build it using `C:\MSVCDev\libusb\msvc\libusb_2017.sln` choosing the `Release` and `x64` configuration. 
 * Clone or download https://github.com/librtlsdr/librtlsdr to C:\MSVCDev\librtlsdr 
 * Launch CMake, set source path to C:/MSVCDev/librtlsdr/
 * Set destination to C:/MSVCDev/librtlsdr_win64/
 * Click "Configure" and choose "Visual Studio 15 2017 Win64" and Finish
 * Set LIBUSB_INCLUDE_DIR to C:/MSVCDev/libusb/
 * Set LIBUSB_LIBRARIES to C:/MSVCDev/libusb/x64/Release/dll/libusb-1.0.lib
-* Set THREADS_PTHREADS_INCLUDE_DIR to (TODO, decribe pthreads-win32 installation)
-* Set THREADS_PTHREADS_WIN32_LIBRARY to (TODO, decribe pthreads-win32 installation)
+* Set THREADS_PTHREADS_INCLUDE_DIR to C:/MSVCDev/pthreads-win32/include
+* Set THREADS_PTHREADS_WIN32_LIBRARY to C:/MSVCDev/pthreads-win32/lib/x64/pthreadVC2.lib
 * Click "Configure" again and then click "Generate"
 
 Open "Developer Command Prompt for VS2017" by right-clicking and "Run as Administrator".
@@ -118,7 +144,7 @@ C:\MSVCDEV> cmake --build librtlsdr_win64 --config Release --target install
     0 Error(s)
 ```
 
-Either way, copy the files `rtlsdr.dll` and `libusb-1.0.dll` in the `C:\MSVCDev\CubicSDR_win64\x64\` directory where CubicSDR can find them.
+Copy the file `rtlsdr.dll` in the `C:\MSVCDev\CubicSDR_win64\x64\` directory where CubicSDR can find it.
 
 ## SoapyRTLSDR
 
@@ -168,6 +194,8 @@ C:\MSVCDEV> cmake --build SoapySDRPlay_win64 --config Release --target install
 
 Copy the generated module file `sdrPlaySupport.dll` in the C:\MSVCDev\CubicSDR_win64\x64\modules directory where CubicSDR can find it.
 
+Don't forget to also copy the `C:\Program Files\SDRplay\API\x64\mir_sdr_api.dll` library file in the C:\MSVCDev\CubicSDR_win64\x64 directory where CubicSDR can find it.
+
 # Debugging CubicSDR
 
 Although all binaries are compiled in `Release`, it doesn't prevent debugging with it.