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More audio queue tuning -> less lag.

This commit is contained in:
Christian Speckner 2018-05-12 16:21:58 +02:00
parent 7391c55f9e
commit f01553bdc7
1 changed files with 10 additions and 6 deletions
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16
src/emucore/EmulationTiming.cxx
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@ -19,8 +19,13 @@
namespace { namespace {
constexpr uInt32 AUDIO_HALF_FRAMES_PER_FRAGMENT = 1; constexpr uInt32 AUDIO_HALF_FRAMES_PER_FRAGMENT = 1;
constexpr uInt32 QUEUE_CAPACITY_SAFETY_FACTOR = 2; constexpr uInt32 QUEUE_CAPACITY_EXTRA_FRAGMENTS = 1;
constexpr uInt32 PREBUFFER_FRAGMENT_COUNT = 2; constexpr uInt32 PREBUFFER_EXTRA_FRAGMENT_COUNT = 2;
uInt32 discreteDivCeil(uInt32 n, uInt32 d)
{
return n / d + ((n % d == 0) ? 0 : 1);
}
} }
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@ -117,14 +122,13 @@ uInt32 EmulationTiming::audioSampleRate() const
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
uInt32 EmulationTiming::audioQueueCapacity() const uInt32 EmulationTiming::audioQueueCapacity() const
{ {
uInt32 capacity = (myPlaybackPeriod * audioSampleRate()) / (audioFragmentSize() * myPlaybackRate) + 1; uInt32 minCapacity = discreteDivCeil(maxCyclesPerTimeslice() * audioSampleRate(), audioFragmentSize() * cyclesPerSecond());
uInt32 minCapacity = (maxCyclesPerTimeslice() * audioSampleRate()) / (audioFragmentSize() * cyclesPerSecond()) + 1;
return std::max(prebufferFragmentCount() + 1, QUEUE_CAPACITY_SAFETY_FACTOR * std::max(capacity, minCapacity)); return std::max(prebufferFragmentCount(), minCapacity) + QUEUE_CAPACITY_EXTRA_FRAGMENTS;
} }
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
uInt32 EmulationTiming::prebufferFragmentCount() const uInt32 EmulationTiming::prebufferFragmentCount() const
{ {
return (myPlaybackPeriod * audioSampleRate()) / (audioFragmentSize() * myPlaybackRate) + PREBUFFER_FRAGMENT_COUNT; return discreteDivCeil(myPlaybackPeriod * audioSampleRate(), audioFragmentSize() * myPlaybackRate) + PREBUFFER_EXTRA_FRAGMENT_COUNT;
} }