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Add some comments to keep track of timer units.

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This commit is contained in:
Hagen Fritsch
2013-02-24 18:19:55 +01:00
committed by Max Kellermann
parent 2cf31e905b
commit 6f4bb6cd2c
1 changed files with 5 additions and 3 deletions
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8
src/timer.c
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@@ -31,9 +31,9 @@
struct timer *timer_new(const struct audio_format *af) struct timer *timer_new(const struct audio_format *af)
{ {
struct timer *timer = g_new(struct timer, 1); struct timer *timer = g_new(struct timer, 1);
timer->time = 0; timer->time = 0; // us
timer->started = 0; timer->started = 0; // false
timer->rate = af->sample_rate * audio_format_frame_size(af); timer->rate = af->sample_rate * audio_format_frame_size(af); // samples per second
return timer; return timer;
} }
@@ -59,6 +59,8 @@ void timer_add(struct timer *timer, int size)
{ {
assert(timer->started); assert(timer->started);
// (size samples) / (rate samples per second) = duration seconds
// duration seconds * 1000000 = duration us
timer->time += ((uint64_t)size * 1000000) / timer->rate; timer->time += ((uint64_t)size * 1000000) / timer->rate;
} }