+
+/**
+ * Compute when to send a chunk of an audio file.
+ *
+ * \param chunk_num The number of the chunk.
+ * \param chunk_tv The duration of one chunk.
+ * \param stream_start When the first chunk was sent.
+ * \param result The time when to send chunk number \a chunk_num.
+ *
+ * This function computes \a stream_start + \a chunk_num * \a chunk_time.
+ */
+void compute_chunk_time(long unsigned chunk_num,
+ struct timeval *chunk_tv, struct timeval *stream_start,
+ struct timeval *result)
+{
+ struct timeval tmp;
+
+ tv_scale(chunk_num, chunk_tv, &tmp);
+ tv_add(&tmp, stream_start, result);
+}
+
+/**
+ * Retrieve the time of the realtime clock.
+ *
+ * \param tv Where to store the result.
+ *
+ * Gets the current value of the system-wide real-time clock (identified by id
+ * \p CLOCK_REALTIME). If \a tv is \p NULL, the value is stored in a static
+ * buffer, otherwise it is stored at the location given by \a tv.
+ *
+ * \return This function aborts on errors. On success it returns a pointer to
+ * memory containing the current time.
+ *
+ * \sa clock_gettime(2), gettimeofday(2).
+ */
+struct timeval *clock_get_realtime(struct timeval *tv)
+{
+ static struct timeval user_friendly;
+
+ if (!tv)
+ tv = &user_friendly;
+#ifdef HAVE_CLOCK_GETTIME
+ {
+ struct timespec t;
+ int ret;
+
+ ret = clock_gettime(CLOCK_REALTIME, &t);
+ assert(ret == 0);
+ tv->tv_sec = t.tv_sec;
+ tv->tv_usec = t.tv_nsec / 1000;
+ }
+#else
+ #include <sys/time.h>
+ gettimeofday(tv, NULL);
+#endif /* HAVE_CLOCK_GETTIME */
+ return tv;
+}