bigtime_t
frames_duration(
const media_raw_audio_format & format, int64 num_frames)
{
// Tells us how long in us it will take to produce num_frames,
// with the given format.
bigtime_t duration = 0;
if (format.frame_rate > 0) {
duration = s_to_us(num_frames/format.frame_rate);
}
return duration;
}
bigtime_t
buffer_duration(
const media_raw_audio_format & format)
{
// Figuring out duration is easy. We take extra precaution to
// not divide by zero or return irrelevant results.
bigtime_t duration = 0;
if (format.buffer_size > 0 && format.frame_rate > 0 && bytes_per_frame(format) > 0) {
// In these kinds of calculations, it's always useful to double-check
// the unit conversions. (Anyone remember high school physics?)
// bytes/(bytes/frame) / frames/sec
// = frames * sec/frames
// = secs which is what we want.
duration = s_to_us((format.buffer_size / bytes_per_frame(format)) / format.frame_rate);
}
return duration;
}
EXPORT ER dt_gmtime( time_t tim, struct tm* result )
{
return dt_gmtime_us(s_to_us(tim), result);
}
