Skip to content

Time domain stretching #104

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
kunitoki merged 2 commits into from
May 25, 2026
Merged

Time domain stretching #104

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
a5bc7c9
Time domain stretching
kunitoki May 24, 2026
f908896
More timestretching improvements
kunitoki May 25, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
139 changes: 132 additions & 7 deletions examples/graphics/source/examples/AudioFileDemo.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -221,9 +221,12 @@ class MeteringAudioSource : public yup::PositionableAudioSource
class TimeStretchAudioSource : public yup::PositionableAudioSource
{
public:
TimeStretchAudioSource (yup::PositionableAudioSource* sourceToWrap, int numChannelsToUse)
TimeStretchAudioSource (yup::PositionableAudioSource* sourceToWrap,
int numChannelsToUse,
yup::TimeStretchProcessor::Backend backendToUse)
: source (sourceToWrap)
, numChannels (numChannelsToUse)
, preferredBackend (backendToUse)
{
}

Expand All @@ -243,7 +246,7 @@ class TimeStretchAudioSource : public yup::PositionableAudioSource
spec.maximumBlockSize = maxInputBlockSize;
spec.numChannels = numChannels;

const auto result = timeStretchProcessor.prepare (spec);
const auto result = timeStretchProcessor.prepare (spec, preferredBackend);
timeStretchAvailable = result.wasOk();

if (timeStretchAvailable)
Expand Down Expand Up @@ -420,9 +423,11 @@ class TimeStretchAudioSource : public yup::PositionableAudioSource
muteHead = static_cast<int> (clampedBegin - beginFrame);
muteTail = static_cast<int> ((beginFrame + numFrames) - clampedEnd);
const int validFrames = static_cast<int> (clampedEnd - clampedBegin);
const int framesToRead = yup::jmin (validFrames, tempBuffer.getNumSamples());
muteTail = yup::jlimit (0, numFrames - muteHead, muteTail + validFrames - framesToRead);

source->setNextReadPosition (clampedBegin);
yup::AudioSourceChannelInfo info (&tempBuffer, 0, validFrames);
yup::AudioSourceChannelInfo info (&tempBuffer, 0, framesToRead);
source->getNextAudioBlock (info);

for (int ch = 0; ch < numChannels; ++ch)
Expand All @@ -431,11 +436,11 @@ class TimeStretchAudioSource : public yup::PositionableAudioSource
std::fill (destChannels[ch], destChannels[ch] + muteHead, 0.0f);

std::copy (tempBuffer.getReadPointer (ch),
tempBuffer.getReadPointer (ch) + validFrames,
tempBuffer.getReadPointer (ch) + framesToRead,
destChannels[ch] + muteHead);

if (muteTail > 0)
std::fill (destChannels[ch] + muteHead + validFrames,
std::fill (destChannels[ch] + numFrames - muteTail,
destChannels[ch] + numFrames,
0.0f);
}
Expand Down Expand Up @@ -468,6 +473,7 @@ class TimeStretchAudioSource : public yup::PositionableAudioSource
double sampleRate = 0.0;
yup::int64 outputPosition = 0;
bool timeStretchAvailable = false;
yup::TimeStretchProcessor::Backend preferredBackend = yup::TimeStretchProcessor::Backend::automatic;

std::atomic<double> timeRatio { 1.0 };
std::atomic<double> pitchRatio { 1.0 };
Expand Down Expand Up @@ -593,7 +599,8 @@ class AudioFileDemo : public yup::Component
header.removeFromTop (4);
auto stretchRow = header.removeFromTop (buttonHeight);
const int sliderLabelWidth = 70;
const int sliderWidth = 180;
const int sliderWidth = 165;
const int backendWidth = 150;

timeLabel.setBounds (stretchRow.removeFromLeft (sliderLabelWidth));
stretchRow.removeFromLeft (buttonMargin);
Expand All @@ -602,6 +609,10 @@ class AudioFileDemo : public yup::Component
pitchLabel.setBounds (stretchRow.removeFromLeft (sliderLabelWidth));
stretchRow.removeFromLeft (buttonMargin);
pitchShiftSlider.setBounds (stretchRow.removeFromLeft (sliderWidth));
stretchRow.removeFromLeft (buttonMargin * 2);
backendLabel.setBounds (stretchRow.removeFromLeft (sliderLabelWidth));
stretchRow.removeFromLeft (buttonMargin);
backendComboBox.setBounds (stretchRow.removeFromLeft (backendWidth));

bounds.removeFromTop (6);
infoLabel.setBounds (bounds.removeFromTop (22));
Expand Down Expand Up @@ -850,10 +861,31 @@ class AudioFileDemo : public yup::Component
timeStretchSource->setPitchRatio (pitchShiftRatio);
};

addAndMakeVisible (backendLabel);
backendLabel.setText ("Backend", yup::NotificationType::dontSendNotification);
backendLabel.setColor (yup::Label::Style::textFillColorId, yup::Colors::white);

addAndMakeVisible (backendComboBox);
backendComboBox.addItem ("Auto", backendAutomaticId);
backendComboBox.addItem ("Time Domain", backendTimeDomainId);

if (yup::TimeStretchProcessor::isBackendAvailable (yup::TimeStretchProcessor::Backend::bungee))
backendComboBox.addItem ("Bungee", backendBungeeId);

backendComboBox.setSelectedId (getBackendId (selectedTimeStretchBackend),
yup::NotificationType::dontSendNotification);
backendComboBox.onSelectedItemChanged = [this]
{
const auto backend = getBackendForId (backendComboBox.getSelectedId());
setTimeStretchBackend (backend);
};

timeStretchSlider.setEnabled (timeStretchSupported);
pitchShiftSlider.setEnabled (timeStretchSupported);
backendComboBox.setEnabled (timeStretchSupported);
timeLabel.setEnabled (timeStretchSupported);
pitchLabel.setEnabled (timeStretchSupported);
backendLabel.setEnabled (timeStretchSupported);

addAndMakeVisible (waveformDisplay);
waveformDisplay.setSelectable (true);
Expand All @@ -877,6 +909,40 @@ class AudioFileDemo : public yup::Component
infoLabel.setText (currentFileName + " | " + positionText + " | Stopped", yup::NotificationType::dontSendNotification);
}

void setTimeStretchBackend (yup::TimeStretchProcessor::Backend backend)
{
if (selectedTimeStretchBackend == backend)
return;

selectedTimeStretchBackend = backend;

if (hasLoadedAudio && memorySource != nullptr)
rebuildTimeStretchSource();

updateStatus ("Time stretch backend: " + getBackendName (selectedTimeStretchBackend));
updatePlaybackStatus();
}

void rebuildTimeStretchSource()
{
const bool wasPlaying = transportSource.isPlaying();
const double previousPosition = transportSource.getCurrentPosition();

transportSource.stop();
transportSource.setSource (nullptr);

timeStretchSource = std::make_unique<TimeStretchAudioSource> (memorySource.get(),
audioBuffer.getNumChannels(),
selectedTimeStretchBackend);
timeStretchSource->setTimeRatio (timeStretchRatio);
timeStretchSource->setPitchRatio (pitchShiftRatio);
transportSource.setSource (timeStretchSource.get(), 0, nullptr, loadedSampleRate, audioBuffer.getNumChannels());
transportSource.setPosition (previousPosition);

if (wasPlaying)
transportSource.start();
}

void togglePlayback()
{
if (! hasLoadedAudio)
Expand Down Expand Up @@ -939,7 +1005,9 @@ class AudioFileDemo : public yup::Component
transportSource.stop();
transportSource.setSource (nullptr);
memorySource = std::make_unique<yup::MemoryAudioSource> (audioBuffer, false, loopEnabled);
timeStretchSource = std::make_unique<TimeStretchAudioSource> (memorySource.get(), numChannels);
timeStretchSource = std::make_unique<TimeStretchAudioSource> (memorySource.get(),
numChannels,
selectedTimeStretchBackend);
timeStretchSource->setTimeRatio (timeStretchRatio);
timeStretchSource->setPitchRatio (pitchShiftRatio);
transportSource.setSource (timeStretchSource.get(), 0, nullptr, loadedSampleRate, numChannels);
Expand Down Expand Up @@ -1022,6 +1090,56 @@ class AudioFileDemo : public yup::Component
return "*.wav;*.aiff;*.aif;*.flac;*.mp3;*.opus;*.m4a;*.wma;*.ogg";
}

static int getBackendId (yup::TimeStretchProcessor::Backend backend)
{
switch (backend)
{
case yup::TimeStretchProcessor::Backend::automatic:
return backendAutomaticId;

case yup::TimeStretchProcessor::Backend::timeDomain:
return backendTimeDomainId;

case yup::TimeStretchProcessor::Backend::bungee:
return backendBungeeId;
}

return backendAutomaticId;
}

static yup::TimeStretchProcessor::Backend getBackendForId (int backendId)
{
switch (backendId)
{
case backendTimeDomainId:
return yup::TimeStretchProcessor::Backend::timeDomain;

case backendBungeeId:
return yup::TimeStretchProcessor::Backend::bungee;

case backendAutomaticId:
default:
return yup::TimeStretchProcessor::Backend::automatic;
}
}

static yup::String getBackendName (yup::TimeStretchProcessor::Backend backend)
{
switch (backend)
{
case yup::TimeStretchProcessor::Backend::automatic:
return "Auto";

case yup::TimeStretchProcessor::Backend::timeDomain:
return "Time Domain";

case yup::TimeStretchProcessor::Backend::bungee:
return "Bungee";
}

return "Auto";
}

yup::AudioFormatManager formatManager;
yup::AudioDeviceManager deviceManager;
yup::AudioSourcePlayer sourcePlayer;
Expand Down Expand Up @@ -1050,8 +1168,10 @@ class AudioFileDemo : public yup::Component

yup::Label timeLabel;
yup::Label pitchLabel;
yup::Label backendLabel;
yup::Slider timeStretchSlider { yup::Slider::LinearHorizontal, "Time Stretch" };
yup::Slider pitchShiftSlider { yup::Slider::LinearHorizontal, "Pitch Shift" };
yup::ComboBox backendComboBox { "TimeStretchBackend" };

yup::Label infoLabel;
yup::Label statusLabel;
Expand All @@ -1068,7 +1188,12 @@ class AudioFileDemo : public yup::Component
double audioLengthSeconds = 0.0;
double timeStretchRatio = 1.0;
double pitchShiftRatio = 1.0;
yup::TimeStretchProcessor::Backend selectedTimeStretchBackend = yup::TimeStretchProcessor::Backend::automatic;
bool hasLoadedAudio = false;
bool loopEnabled = false;
bool timeStretchSupported = false;

static constexpr int backendAutomaticId = 1;
static constexpr int backendTimeDomainId = 2;
static constexpr int backendBungeeId = 3;
};
Loading
Loading