Expose select_output as espeak_ng_InitializeOutput.

src/include/espeak-ng/espeak_ng.h

 ESPEAK_NG_API espeak_ng_STATUS
 espeak_ng_Initialize(void);
 
+ESPEAK_NG_API void
+espeak_ng_InitializeOutput(espeak_ng_OUTPUT_MODE output_mode);
+
 ESPEAK_NG_API espeak_ng_STATUS
 espeak_ng_CompileDictionary(const char *dsource,
                             const char *dict_name,

src/libespeak-ng/speak_lib.c

 
 #endif
 
-static void select_output(espeak_ng_OUTPUT_MODE output_mode)
+#pragma GCC visibility push(default)
+ESPEAK_NG_API void espeak_ng_InitializeOutput(espeak_ng_OUTPUT_MODE output_mode)
 {
 	my_mode = output_mode;
 	my_audio = NULL;
 	}
 }
 
-#pragma GCC visibility push(default)
 int GetFileLength(const char *filename)
 {
 	struct stat statbuf;
 	switch (output_type)
 	{
 	case AUDIO_OUTPUT_PLAYBACK:
-		select_output(ENOUTPUT_MODE_SPEAK_AUDIO);
+		espeak_ng_InitializeOutput(ENOUTPUT_MODE_SPEAK_AUDIO);
 		break;
 	case AUDIO_OUTPUT_RETRIEVAL:
-		select_output(0);
+		espeak_ng_InitializeOutput(0);
 		break;
 	case AUDIO_OUTPUT_SYNCHRONOUS:
-		select_output(ENOUTPUT_MODE_SYNCHRONOUS);
+		espeak_ng_InitializeOutput(ENOUTPUT_MODE_SYNCHRONOUS);
 		break;
 	case AUDIO_OUTPUT_SYNCH_PLAYBACK:
-		select_output(ENOUTPUT_MODE_SYNCHRONOUS | ENOUTPUT_MODE_SPEAK_AUDIO);
+		espeak_ng_InitializeOutput(ENOUTPUT_MODE_SYNCHRONOUS | ENOUTPUT_MODE_SPEAK_AUDIO);
 		break;
 	}