Add PDF writer.

test/audio/TestAudioWriter.cpp

@@ -8,7 +8,9 @@
 
 #include <memory>
 #include <string>
+#ifdef _WIN32
 #include <windows.h>
+#endif
 #include <iostream>
 
 class TestWriteWav : public TestCase
@@ -32,9 +34,11 @@ class TestAudioRender : public TestCase
 public:
     bool Run() override
     {
+#ifdef _WIN32
         WasapiInterface audio_interface;
         auto device = AudioDevice::Create();
         audio_interface.Play(device);
+#endif
         return true;
     }
 };
@@ -42,8 +46,9 @@ public:
 //int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
 int main()
 {
+#ifdef _WIN32
     CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
-
+#endif
     std::cout << "into entry point" << std::endl;
     TestCaseRunner runner;
     //runner.AddTestCase("TestWriteNav", std::make_unique<TestWriteWav>());
@@ -51,6 +56,7 @@ int main()
 
     const auto testsPassed = runner.Run();
     return testsPassed ? 0 : -1;
-
+#ifdef _WIN32
     CoUninitialize();
+#endif
 }