audio: add support for asio sdk audio backend

Author: jcelerier

.gitmodules

@@ -121,3 +121,6 @@
 [submodule "3rdparty/libcoap"]
 	path = 3rdparty/libcoap
 	url = https://github.com/obgm/libcoap
+[submodule "3rdparty/asio"]
+	path = 3rdparty/asio
+	url = https://github.com/jcelerier/asio-2

3rdparty/asio

@@ -194,6 +194,14 @@ if(OSSIA_ENABLE_PIPEWIRE)
   endif()
 endif()
 
+if(OSSIA_ENABLE_ASIO)
+  include(deps/asio-sdk)
+
+  if(NOT TARGET asio::sdk)
+    set(OSSIA_ENABLE_ASIO FALSE CACHE INTERNAL "" FORCE)
+  endif()
+endif()
+
 if(OSSIA_ENABLE_SDL)
   include(deps/sdl)
 

cmake/OssiaDeps.cmake

@@ -22,6 +22,9 @@ option(OSSIA_ENABLE_PORTAUDIO "Use PortAudio if available" ON)
 option(OSSIA_ENABLE_PIPEWIRE "Use PortAudio if available" ON)
 option(OSSIA_ENABLE_RUBBERBAND "Use RubberBand" ON)
 option(OSSIA_ENABLE_LIBSAMPLERATE "Use libsamplerate" ON)
+if(WIN32)
+  option(OSSIA_ENABLE_ASIO "Use Steinberg ASIO SDK if available" ON)
+endif()
 option(OSSIA_ENABLE_SDL "Use SDL if available" ON)
 option(OSSIA_ENABLE_FFT "Enable FFT support" OFF)
 option(OSSIA_ENABLE_FFTW "Enable FFT through FFTW" OFF)

cmake/OssiaOptions.cmake

@@ -0,0 +1,27 @@
+# Steinberg ASIO SDK (submodule at 3rdparty/asio)
+
+set(ASIO_SDK_DIR "${OSSIA_3RDPARTY_FOLDER}/asio")
+
+if(EXISTS "${ASIO_SDK_DIR}/common/asio.h" AND WIN32)
+  add_library(asio_sdk STATIC)
+  add_library(asio::sdk ALIAS asio_sdk)
+  target_compile_definitions(asio_sdk PRIVATE UNICODE=1 _UNICODE=1)
+
+  target_include_directories(asio_sdk SYSTEM PUBLIC
+    $<BUILD_INTERFACE:${ASIO_SDK_DIR}/common>
+    $<BUILD_INTERFACE:${ASIO_SDK_DIR}/host>
+    $<BUILD_INTERFACE:${ASIO_SDK_DIR}/host/pc>
+  )
+
+  # ASIO SDK requires these source files to be compiled into the host application
+  target_sources(asio_sdk PRIVATE
+    ${ASIO_SDK_DIR}/common/asio.cpp
+    ${ASIO_SDK_DIR}/host/asiodrivers.cpp
+    ${ASIO_SDK_DIR}/host/pc/asiolist.cpp
+  )
+
+  # ASIO SDK requires COM and advapi32 on Windows
+  target_link_libraries(asio_sdk PRIVATE ole32 advapi32)
+
+  # OSSIA_ENABLE_ASIO is set via ossia-config.hpp.in / #cmakedefine
+endif()

cmake/deps/asio-sdk.cmake

@@ -34,6 +34,7 @@
 #cmakedefine OSSIA_ENABLE_PIPEWIRE
 #cmakedefine OSSIA_ENABLE_RUBBERBAND
 #cmakedefine OSSIA_ENABLE_LIBSAMPLERATE
+#cmakedefine OSSIA_ENABLE_ASIO
 #cmakedefine OSSIA_ENABLE_SDL
 #cmakedefine OSSIA_SCENARIO_DATAFLOW