Experimental portaudio-based backend

CMakeLists.txt

@@ -8,20 +8,26 @@ project(libstdaudio)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
-
 if (APPLE)
     set(CMAKE_EXE_LINKER_FLAGS "-framework CoreAudio")
 endif ()
 
 include_directories(include)
 
 add_executable(white_noise examples/white_noise.cpp)
+target_link_libraries(white_noise PRIVATE ${CMAKE_DL_LIBS})
 add_executable(print_devices examples/print_devices.cpp)
+target_link_libraries(print_devices PRIVATE ${CMAKE_DL_LIBS})
 add_executable(sine_wave examples/sine_wave.cpp)
+target_link_libraries(sine_wave PRIVATE ${CMAKE_DL_LIBS})
 add_executable(melody examples/melody.cpp)
+target_link_libraries(melody PRIVATE ${CMAKE_DL_LIBS})
 add_executable(level_meter examples/level_meter.cpp)
+target_link_libraries(level_meter PRIVATE ${CMAKE_DL_LIBS})
 
 add_executable(test
         test/test_main.cpp
       #  test/null_backend_test.cpp // TODO: fix linker error when uncommenting this one!
-        test/default_backend_test.cpp)
+        test/default_backend_test.cpp)
+
+target_link_libraries(test PRIVATE ${CMAKE_DL_LIBS})

include/audio

@@ -27,7 +27,12 @@ struct audio_null_driver_t {};
   struct __coreaudio_driver_t {};
   using audio_default_driver_t = __coreaudio_driver_t;
 #else
-  using audio_default_driver_t = audio_null_driver_t;
+
+#if __has_include(<portaudio.h>)
+  struct __portaudio_driver_t {};
+  using audio_default_driver_t = __portaudio_driver_t;
+#endif
+
 #endif // __APPLE__
 
 _LIBSTDAUDIO_NAMESPACE_END
@@ -39,3 +44,6 @@ _LIBSTDAUDIO_NAMESPACE_END
 #ifdef __APPLE__
   #include <audio_backend/__coreaudio_backend.h>
 #endif // __APPLE__
+#if __has_include(<portaudio.h>)
+  #include <audio_backend/__portaudio_backend.h>
+#endif // __APPLE__