void AudioPrefetch::seek(unsigned seekTo)
{
// printf("seek %d\n", seekTo);
#ifdef AUDIOPREFETCH_DEBUG
printf("AudioPrefetch::seek to:%u seekCount:%d\n", seekTo, seekCount);
#endif
// Speedup: More than one seek message pending?
// Eat up seek messages until we get to the very LATEST one,
// because all the rest which came before it are irrelevant now,
// and processing them all was taking extreme time, especially with
// resampling enabled.
// In particular, when the user 'slides' the play cursor back and forth
// there are MANY seek messages in the pipe, and with resampling enabled
// it was taking minutes to finish seeking. If the user hit play during that time,
// things were messed up (FIFO underruns, choppy intermittent sound etc).
// Added by Tim. p3.3.20
if (seekCount > 1)
{
--seekCount;
return;
}
writePos = seekTo;
WaveTrackList* tl = song->waves();
for (iWaveTrack it = tl->begin(); it != tl->end(); ++it)
{
WaveTrack* track = *it;
track->clearPrefetchFifo();
}
bool isFirstPrefetch = true;
for (unsigned int i = 0; i < (fifoLength) - 1; ++i)//prevent compiler warning: comparison of signed/unsigned
{
// Indicate do a seek command before read, but only on the first pass.
// Changed by Tim. p3.3.17
//prefetch();
prefetch(isFirstPrefetch);
isFirstPrefetch = false;
// To help speed things up even more, check the count again. Return if more seek messages are pending.
// Added by Tim. p3.3.20
if (seekCount > 1)
{
--seekCount;
return;
}
}
seekPos = seekTo;
//seekDone = true;
--seekCount;
}
