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Yet another fwd/rev animation curve

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This commit is contained in:
Matthias Neeracher 2011-09-11 20:17:02 +02:00
parent 22180008d2
commit 72c4ac4d2b
1 changed files with 18 additions and 8 deletions
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26
Sources/VLSoundOut.cpp
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@ -288,18 +288,24 @@ void VLAUSoundOut::SetPlayRate(float rate)
MusicPlayerSetPlayRateScalar(fPlayer, fPlayRate);
}
static MusicTimeStamp sLastSkip = 0.0;
const MusicTimeStamp kInitialSkip= 0.15;
const MusicTimeStamp kMaxSkip = 1.0;
const MusicTimeStamp kSkipFactor = 0.5;
static MusicTimeStamp sSkipSign = 0;
static int sSkipSteps = 0;
static VLResetTimer * sSkipResetTimer;
void VLAUSoundOut::SkipTimeInterval()
{
MusicTimeStamp time;
MusicPlayerGetTime(fPlayer, &time);
time += sLastSkip;
sLastSkip *= 1.1;
++sSkipSteps;
MusicTimeStamp delta = kInitialSkip+(kMaxSkip-kInitialSkip)
*sSkipSign*(1.0-exp(-sSkipSteps*kSkipFactor));
time += delta;
if (!sSkipResetTimer)
sSkipResetTimer = new VLResetTimer(500*NSEC_PER_MSEC, ^{
sLastSkip = 0.0;
sSkipSteps = 0;
});
sSkipResetTimer->Prime();
MusicPlayerSetTime(fPlayer, time);
@ -307,15 +313,19 @@ void VLAUSoundOut::SkipTimeInterval()
void VLAUSoundOut::Fwd()
{
if (sLastSkip <= 0.0)
sLastSkip = 0.1;
if (sSkipSign <= 0.0) {
sSkipSign = 1.0;
sSkipSteps = 0;
}
SkipTimeInterval();
}
void VLAUSoundOut::Bck()
{
if (sLastSkip >= 0.0)
sLastSkip = -0.1;
if (sSkipSign >= 0.0) {
sSkipSign = -1.0;
sSkipSteps = 0;
}
SkipTimeInterval();
}