/*
- * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
void tv_divide(const unsigned long divisor, const struct timeval *tv,
struct timeval *result)
{
- long unsigned q;
+ uint64_t x = ((uint64_t)tv->tv_sec * 1000 * 1000 + tv->tv_usec) / divisor;
- q = tv->tv_usec / divisor;
- result->tv_sec = tv->tv_sec / divisor;
- result->tv_usec = (tv->tv_sec - result->tv_sec * divisor)
- * 1000 * 1000 / divisor;
- if (result->tv_usec + q >= 1000 * 1000) {
- result->tv_sec++;
- result->tv_usec = 1000 * 1000 - result->tv_usec - q;
- } else
- result->tv_usec += q;
+ result->tv_sec = x / 1000 / 1000;
+ result->tv_usec = x % (1000 * 1000);
}
/**
ret = -ret;
return ret;
}
+
+/**
+ * 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 stream_start + chunk_num * 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);
+}