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get back to ideal frame time when slow

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This commit is contained in:
Stephen Birarda 2018-09-05 16:55:46 -07:00
parent 925c39cbd3
commit aea9775e4d
2 changed files with 18 additions and 16 deletions
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29
assignment-client/src/audio/AudioMixer.cpp
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@ -386,15 +386,18 @@ void AudioMixer::start() {
// mix state
unsigned int frame = 1;
auto frameTimestamp = p_high_resolution_clock::now();
while (!_isFinished) {
auto ticTimer = _ticTiming.timer();
{
auto timer = _checkTimeTiming.timer();
auto frameDuration = timeFrame(frameTimestamp);
throttle(frameDuration, frame);
if (_startFrameTimestamp.time_since_epoch().count() == 0) {
_startFrameTimestamp = _idealFrameTimestamp = p_high_resolution_clock::now();
} else {
{
auto timer = _checkTimeTiming.timer();
auto frameDuration = timeFrame();
throttle(frameDuration, frame);
}
}
auto frameTimer = _frameTiming.timer();
@ -449,26 +452,22 @@ void AudioMixer::start() {
}
}
chrono::microseconds AudioMixer::timeFrame(p_high_resolution_clock::time_point& timestamp) {
chrono::microseconds AudioMixer::timeFrame() {
// advance the next frame
auto nextTimestamp = timestamp + chrono::microseconds(AudioConstants::NETWORK_FRAME_USECS);
auto now = p_high_resolution_clock::now();
// compute how long the last frame took
auto duration = chrono::duration_cast<chrono::microseconds>(now - timestamp);
auto duration = chrono::duration_cast<chrono::microseconds>(now - _startFrameTimestamp);
// set the new frame timestamp
timestamp = max(now, nextTimestamp);
_idealFrameTimestamp += chrono::microseconds(AudioConstants::NETWORK_FRAME_USECS);
{
auto timer = _sleepTiming.timer();
// sleep until the next frame should start
// WIN32 sleep_until is broken until VS2015 Update 2
// instead, max (above) guarantees that timestamp >= now, so we can sleep_for
this_thread::sleep_for(timestamp - now);
this_thread::sleep_until(_idealFrameTimestamp);
}
_startFrameTimestamp = p_high_resolution_clock::now();
return duration;
}

5
assignment-client/src/audio/AudioMixer.h
View file

@ -84,7 +84,7 @@ private slots:
private:
// mixing helpers
std::chrono::microseconds timeFrame(p_high_resolution_clock::time_point& timestamp);
std::chrono::microseconds timeFrame();
void throttle(std::chrono::microseconds frameDuration, int frame);
AudioMixerClientData* getOrCreateClientData(Node* node);
@ -94,6 +94,9 @@ private:
void parseSettingsObject(const QJsonObject& settingsObject);
void clearDomainSettings();
p_high_resolution_clock::time_point _idealFrameTimestamp;
p_high_resolution_clock::time_point _startFrameTimestamp;
float _trailingMixRatio { 0.0f };
float _throttlingRatio { 0.0f };