float AudioParamTimeline::valueForContextTime(AudioContext& context, float defaultValue, bool& hasValue)
{
{
std::unique_lock<Lock> lock(m_eventsMutex, std::try_to_lock);
if (!lock.owns_lock() || !m_events.size() || context.currentTime() < m_events[0].time()) {
hasValue = false;
return defaultValue;
}
}
// Ask for just a single value.
float value;
double sampleRate = context.sampleRate();
double startTime = context.currentTime();
double endTime = startTime + 1.1 / sampleRate; // time just beyond one sample-frame
double controlRate = sampleRate / AudioNode::ProcessingSizeInFrames; // one parameter change per render quantum
value = valuesForTimeRange(startTime, endTime, defaultValue, &value, 1, sampleRate, controlRate);
hasValue = true;
return value;
}
