test/run_encoder, ...: convert to C++

src/audio_parser.h

@@ -31,6 +31,10 @@
 
 struct audio_format;
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Parses a string in the form "SAMPLE_RATE:BITS:CHANNELS" into an
  * #audio_format.
@@ -46,4 +50,8 @@ bool
 audio_format_parse(struct audio_format *dest, const char *src,
 		   bool mask, GError **error_r);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/pcm_volume.h

@@ -65,6 +65,10 @@ pcm_volume_dither(void)
 	return (r & 511) - ((r >> 9) & 511);
 }
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Adjust the volume of the specified PCM buffer.
  *
@@ -79,4 +83,8 @@ pcm_volume(void *buffer, size_t length,
 	   enum sample_format format,
 	   int volume);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif