API names, and conversion from/to API identifier

RtAudio.cpp

@@ -45,6 +45,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <climits>
+#include <cctype>
 #include <cmath>
 #include <algorithm>
 
@@ -133,6 +134,92 @@ void RtAudio :: getCompiledApi( std::vector<RtAudio::Api> &apis )
 #endif
 }
 
+const std::string &RtAudio :: getCompiledApiName( RtAudio::Api api )
+{
+#if defined(__UNIX_JACK__)
+  if ( api == UNIX_JACK ) {
+    static std::string name( "JACK" );
+    return name;
+  }
+#endif
+#if defined(__LINUX_PULSE__)
+  if ( api == LINUX_PULSE ) {
+    static std::string name( "PulseAudio" );
+    return name;
+  }
+#endif
+#if defined(__LINUX_ALSA__)
+  if ( api == LINUX_ALSA ) {
+    static std::string name( "ALSA" );
+    return name;
+  }
+#endif
+#if defined(__LINUX_OSS__)
+  if ( api == LINUX_OSS ) {
+    static std::string name( "OSS" );
+    return name;
+  }
+#endif
+#if defined(__WINDOWS_ASIO__)
+  if ( api == WINDOWS_ASIO ) {
+    static std::string name( "ASIO" );
+    return name;
+  }
+#endif
+#if defined(__WINDOWS_WASAPI__)
+  if ( api == WINDOWS_WASAPI ) {
+    static std::string name( "WASAPI" );
+    return name;
+  }
+#endif
+#if defined(__WINDOWS_DS__)
+  if ( api == WINDOWS_DS ) {
+    static std::string name( "DirectSound" );
+    return name;
+  }
+#endif
+#if defined(__MACOSX_CORE__)
+  if ( api == MACOSX_CORE ) {
+    static std::string name( "CoreAudio" );
+    return name;
+  }
+#endif
+#if defined(__RTAUDIO_DUMMY__)
+  if ( api == RTAUDIO_DUMMY ) {
+    static std::string name( "Dummy" );
+    return name;
+  }
+#endif
+  static std::string name;
+  return name;
+}
+
+RtAudio::Api RtAudio :: getCompiledApiByName( const std::string &name )
+{
+  unsigned int api_number = RtAudio::UNSPECIFIED;
+  size_t nameLength = name.size();
+
+  if ( nameLength == 0 )
+    return RtAudio::UNSPECIFIED;
+
+  while ( api_number <= RtAudio::RTAUDIO_DUMMY ) {
+    const std::string &otherName =
+      getCompiledApiName((RtAudio::Api)api_number);
+
+    bool equal = nameLength == otherName.size();
+    for ( size_t i = 0; equal && i < nameLength; ++i )
+      equal = tolower((unsigned char)name[i]) ==
+        tolower((unsigned char)otherName[i]);
+
+    if ( equal )
+      return (RtAudio::Api)api_number;
+
+    ++api_number;
+  }
+
+    return RtAudio::UNSPECIFIED;
+}
+
 void RtAudio :: openRtApi( RtAudio::Api api )
 {
   if ( rtapi_ )

RtAudio.h

@@ -397,6 +397,21 @@ class RTAUDIO_DLL_PUBLIC RtAudio
   */
   static void getCompiledApi( std::vector<RtAudio::Api> &apis );
 
+  //! Return the name of a specified compiled audio API.
+  /*!
+    If the API is unknown or not compiled, this function will return
+    the empty string.
+  */
+  static const std::string &getCompiledApiName( RtAudio::Api api );
+
+  //! Return the compiled audio API having the given name.
+  /*!
+    A case insensitive comparison will check the specified name
+    against the list of compiled APIs, and return the one which
+    matches. On failure, the function returns UNSPECIFIED.
+  */
+  static RtAudio::Api getCompiledApiByName( const std::string &name );
+
   //! The class constructor.
   /*!
     The constructor performs minor initialization tasks.  An exception

tests/CMakeLists.txt

@@ -18,6 +18,9 @@ target_link_libraries(record rtaudio_static ${LINKLIBS})
 add_executable(duplex duplex.cpp)
 target_link_libraries(duplex rtaudio_static ${LINKLIBS})
 
+add_executable(apinames apinames.cpp)
+target_link_libraries(apinames rtaudio_static ${LINKLIBS})
+
 add_executable(testall testall.cpp)
 target_link_libraries(testall rtaudio_static ${LINKLIBS})
 

tests/Makefile.am

@@ -1,5 +1,5 @@
 
-noinst_PROGRAMS = audioprobe playsaw playraw record duplex testall teststops
+noinst_PROGRAMS = audioprobe playsaw playraw record duplex apinames testall teststops
 
 AM_CXXFLAGS = -Wall -I$(top_srcdir)
 
@@ -18,6 +18,9 @@ record_LDADD = $(top_builddir)/librtaudio.la
 duplex_SOURCES = duplex.cpp
 duplex_LDADD = $(top_builddir)/librtaudio.la
 
+apinames_SOURCES = apinames.cpp
+apinames_LDADD = $(top_builddir)/librtaudio.la
+
 testall_SOURCES = testall.cpp
 testall_LDADD = $(top_builddir)/librtaudio.la
 

tests/apinames.cpp

@@ -0,0 +1,75 @@
+/******************************************/
+/*
+  apinames.cpp
+  by Jean Pierre Cimalando, 2018.
+
+  This program tests parts of RtAudio related
+  to API names, the conversion from name to API
+  and vice-versa.
+*/
+/******************************************/
+
+#include "RtAudio.h"
+#include <cstdlib>
+#include <cctype>
+#include <iostream>
+
+int main() {
+    std::vector<RtAudio::Api> apis;
+    RtAudio::getCompiledApi( apis );
+
+    // ensure the known APIs return valid names
+    std::cout << "API names by identifier:\n";
+    for ( size_t i = 0; i < apis.size() ; ++i ) {
+        const std::string &name = RtAudio::getCompiledApiName(apis[i]);
+        if (name.empty()) {
+            std::cerr << "Invalid name for API " << (int)apis[i] << "\n";
+            exit(1);
+        }
+        std::cout << "* " << (int)apis[i] << ": '" << name << "'\n";
+    }
+
+    // ensure unknown APIs return the empty string
+    {
+        const std::string &name = RtAudio::getCompiledApiName((RtAudio::Api)-1);
+        if (!name.empty()) {
+            std::cerr << "Bad string for invalid API\n";
+            exit(1);
+        }
+    }
+
+    // try getting API identifier by case-insensitive name
+    std::cout << "API identifiers by name:\n";
+    for ( size_t i = 0; i < apis.size() ; ++i ) {
+        std::string name = RtAudio::getCompiledApiName(apis[i]);
+        if ( RtAudio::getCompiledApiByName(name) != apis[i] ) {
+            std::cerr << "Bad identifier for API '" << name << "'\n";
+            exit( 1 );
+        }
+        std::cout << "* '" << name << "': " << (int)apis[i] << "\n";
+        for ( size_t j = 0; j < name.size(); ++j )
+            name[j] = (j & 1) ? toupper(name[j]) : tolower(name[j]);
+        if ( RtAudio::getCompiledApiByName(name) != apis[i] ) {
+            std::cerr << "Bad identifier for API '" << name << "'\n";
+            exit( 1 );
+        }
+        std::cout << "* '" << name << "': " << (int)apis[i] << "\n";
+    }
+
+    // try getting an API identifier by unknown name
+    {
+        RtAudio::Api api;
+        api = RtAudio::getCompiledApiByName("ALSO");
+        if ( api != RtAudio::UNSPECIFIED ) {
+            std::cerr << "Bad identifier for unknown API name\n";
+            exit( 1 );
+        }
+        api = RtAudio::getCompiledApiByName("");
+        if ( api != RtAudio::UNSPECIFIED ) {
+            std::cerr << "Bad identifier for unknown API name\n";
+            exit( 1 );
+        }
+    }
+
+    return 0;
+}