unsigned int vss_next(void);
unsigned int vss_repos(void);
unsigned int vss_paused(void);
-char *vss_get_header(int *header_len);
+char *vss_get_header(unsigned *header_len);
struct timeval *vss_chunk_time(void);
int guess_audio_format(const char *name);
const char *supported_audio_formats(void);