Hi,
So I have plotted out a waveform, and simply want to have a vertical
line represent a playhead which will move across the waveform's X-axis
as it plays.
I am using an NSBox as my playhead, and in my callback proc, I tried doing
inside the loop:
player->sampler.playheadView.position =
player->sampler.playheadView.containerWidth / player->buffer.size *
currentSampleIndex
my playheadView's position setter just does this:
-(void)setPosition:(NSUInteger)position {
if (position == self.position) return;
[self setFrameOrigin:NSMakePoint(position, 0)];
}
However, this causes everything to slow down to the point that the audio plays
with clicks and gaps inbetween the frames..
I changed this to do a performSelectorOnMainThread, where this operation
occurs, but it seems like the playhead only gets updated a handful of times
during playback, so it does not look good..
What is the ideal way to get visual feedback like this during playback?
Thanks!
Patrick J. Collins
http://collinatorstudios.com
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