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Dynamically adjust fragment buffer size based on fragmen size and period.

This commit is contained in:
Christian Speckner 2018-01-29 00:08:50 +01:00
parent 13eefbb542
commit f87316bfdb
2 changed files with 10 additions and 2 deletions
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11
src/common/SoundSDL2.cxx
View File

@ -44,7 +44,8 @@ SoundSDL2::SoundSDL2(OSystem& osystem)
myVolume(100),
myVolumeFactor(0xffff),
myAudioQueue(0),
myCurrentFragment(0)
myCurrentFragment(0),
myFragmentBufferSize(0)
{
myOSystem.logMessage("SoundSDL2::SoundSDL2 started ...", 2);
@ -124,6 +125,12 @@ void SoundSDL2::open(shared_ptr<AudioQueue> audioQueue)
myCurrentFragment = 0;
myTimeIndex = 0;
myFragmentIndex = 0;
myFragmentBufferSize = static_cast<uInt32>(
ceil(
1.5 * static_cast<double>(myHardwareSpec.samples) / static_cast<double>(myAudioQueue->fragmentSize())
* static_cast<double>(myAudioQueue->sampleRate()) / static_cast<double>(myHardwareSpec.freq)
)
);
// Adjust volume to that defined in settings
setVolume(myOSystem.settings().getInt("volume"));
@ -215,7 +222,7 @@ void SoundSDL2::adjustVolume(Int8 direction)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void SoundSDL2::processFragment(Int16* stream, uInt32 length)
{
if (myUnderrun && myAudioQueue->size() > 1) {
if (myUnderrun && myAudioQueue->size() > myFragmentBufferSize) {
myUnderrun = false;
myCurrentFragment = myAudioQueue->dequeue(myCurrentFragment);
myFragmentIndex = 0;

1
src/common/SoundSDL2.hxx
View File

@ -123,6 +123,7 @@ class SoundSDL2 : public Sound
Int16* myCurrentFragment;
uInt32 myTimeIndex;
uInt32 myFragmentIndex;
uInt32 myFragmentBufferSize;
bool myUnderrun;
private: