Add webaudio hostapi

CMakeLists.txt

@@ -288,6 +288,17 @@ if(WIN32)
     configure_file(cmake/portaudio.def.in "${CMAKE_CURRENT_BINARY_DIR}/portaudio.def" @ONLY)
     target_sources(PortAudio PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/portaudio.def")
   endif()
+elseif(EMSCRIPTEN)
+  option(PA_USE_WEBAUDIO "Enable support for WebAudio" ON)
+
+  if(PA_USE_WEBAUDIO)
+    target_sources(PortAudio PRIVATE
+      src/hostapi/webaudio/pa_webaudio.c
+    )
+    target_compile_definitions(PortAudio PUBLIC PA_USE_WEBAUDIO=1)
+    set(PORTAUDIO_PUBLIC_HEADERS "${PORTAUDIO_PUBLIC_HEADERS}" include/pa_webaudio.h)
+    set(PKGCONFIG_CFLAGS "${PKGCONFIG_CFLAGS} -DPA_USE_WEBAUDIO=1")
+  endif()
 elseif(UNIX)
   target_sources(PortAudio PRIVATE
     src/os/unix/pa_unix_hostapis.c

include/pa_webaudio.h

@@ -0,0 +1,12 @@
+#ifndef PA_WEBAUDIO_H
+#define PA_WEBAUDIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/common/pa_hostapi.h

@@ -111,6 +111,13 @@ are defaulted to 1.
 #error "Portaudio: PA_NO_<APINAME> is no longer supported, please remove definition and use PA_USE_<APINAME> instead"
 #endif
 
+#ifndef PA_USE_WEBAUDIO
+#define PA_USE_WEBAUDIO 0
+#elif (PA_USE_WEBAUDIO != 0) && (PA_USE_WEBAUDIO != 1)
+#undef PA_USE_WEBAUDIO
+#define PA_USE_WEBAUDIO 1
+#endif
+
 #ifndef PA_USE_OSS
 #define PA_USE_OSS 0
 #elif (PA_USE_OSS != 0) && (PA_USE_OSS != 1)