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audio_core: Add EnableStretching to interface so that one can toggle stretching on and off

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This commit is contained in:
MerryMage 2016-08-31 16:56:30 +01:00
parent 0ef4185644
commit 904a319694
4 changed files with 52 additions and 9 deletions
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46
src/audio_core/hle/dsp.cpp
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@ -85,13 +85,45 @@ static StereoFrame16 GenerateCurrentFrame() {
// Audio output
static bool perform_time_stretching = true;
static std::unique_ptr<AudioCore::Sink> sink;
static AudioCore::TimeStretcher time_stretcher;
static void FlushResidualStretcherAudio() {
time_stretcher.Flush();
while (true) {
std::vector<s16> residual_audio = time_stretcher.Process(sink->SamplesInQueue());
if (residual_audio.empty())
break;
sink->EnqueueSamples(residual_audio.data(), residual_audio.size() / 2);
}
}
static void OutputCurrentFrame(const StereoFrame16& frame) {
time_stretcher.AddSamples(&frame[0][0], frame.size());
std::vector<s16> stretched_samples = time_stretcher.Process(sink->SamplesInQueue());
sink->EnqueueSamples(stretched_samples.data(), stretched_samples.size() / 2);
if (perform_time_stretching) {
time_stretcher.AddSamples(&frame[0][0], frame.size());
std::vector<s16> stretched_samples = time_stretcher.Process(sink->SamplesInQueue());
sink->EnqueueSamples(stretched_samples.data(), stretched_samples.size() / 2);
} else {
constexpr size_t maximum_sample_latency = 1024; // about 32 miliseconds
if (sink->SamplesInQueue() > maximum_sample_latency) {
// This can occur if we're running too fast and samples are starting to back up.
// Just drop the samples.
return;
}
sink->EnqueueSamples(&frame[0][0], frame.size());
}
}
void EnableStretching(bool enable) {
if (perform_time_stretching == enable)
return;
if (!enable) {
FlushResidualStretcherAudio();
}
perform_time_stretching = enable;
}
// Public Interface
@ -112,12 +144,8 @@ void Init() {
}
void Shutdown() {
time_stretcher.Flush();
while (true) {
std::vector<s16> residual_audio = time_stretcher.Process(sink->SamplesInQueue());
if (residual_audio.empty())
break;
sink->EnqueueSamples(residual_audio);
if (perform_time_stretching) {
FlushResidualStretcherAudio();
}
}

8
src/audio_core/hle/dsp.h
View file

@ -544,5 +544,13 @@ bool Tick();
*/
void SetSink(std::unique_ptr<AudioCore::Sink> sink);
/**
* Enables/Disables audio-stretching.
* Audio stretching is an enhancement that stretches audio to match emulation
* speed to prevent stuttering at the cost of some audio latency.
* @param enable true to enable, false to disable.
*/
void EnableStretching(bool enable);
} // namespace HLE
} // namespace DSP