From dc8691353321405529e0df712386c7b6098f0cdf Mon Sep 17 00:00:00 2001
From: xenakios <xenakios@gmail.com>
Date: Thu, 14 Dec 2017 22:17:45 +0200
Subject: [PATCH] Added pause playback feature with fades for smoothing

---
 Source/PS_Source/StretchSource.cpp | 42 ++++++++++++++++++++++++++++--
 Source/PS_Source/StretchSource.h   |  6 +++++
 Source/PluginProcessor.cpp         |  6 +++--
 Source/PluginProcessor.h           |  1 +
 4 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/Source/PS_Source/StretchSource.cpp b/Source/PS_Source/StretchSource.cpp
index 02109ad..9049016 100644
--- a/Source/PS_Source/StretchSource.cpp
+++ b/Source/PS_Source/StretchSource.cpp
@@ -164,6 +164,11 @@ void StretchAudioSource::setLoopXFadeLength(double lenseconds)
 void StretchAudioSource::getNextAudioBlock(const AudioSourceChannelInfo & bufferToFill)
 {
 	ScopedLock locker(m_cs);
+	if (m_pause_state == 2)
+	{
+		bufferToFill.buffer->clear(bufferToFill.startSample,bufferToFill.numSamples);
+		return;
+	}
 	if (m_stretchoutringbuf.available() > 0)
 		m_output_has_begun = true;
 	bool freezing = m_freezing;
@@ -341,8 +346,17 @@ void StretchAudioSource::getNextAudioBlock(const AudioSourceChannelInfo & buffer
 		}
 		
 	}
-	//if (m_inputfile->hasEnded())
-		m_output_counter += bufferToFill.numSamples;
+	if (m_pause_state == 1)
+	{
+		bufferToFill.buffer->applyGainRamp(bufferToFill.startSample, bufferToFill.numSamples, 1.0f, 0.0f);
+		m_pause_state = 2;
+	}
+	if (m_pause_state == 3)
+	{
+		bufferToFill.buffer->applyGainRamp(bufferToFill.startSample, bufferToFill.numSamples, 0.0f, 1.0f);
+		m_pause_state = 0;
+	}
+	m_output_counter += bufferToFill.numSamples;
 }
 
 void StretchAudioSource::setNextReadPosition(int64 /*newPosition*/)
@@ -538,6 +552,30 @@ void StretchAudioSource::setFFTSize(int size)
 	}
 }
 
+void StretchAudioSource::setPaused(bool b)
+{
+	if (b == true && m_pause_state>0)
+		return;
+	if (b == false && m_pause_state == 0)
+		return;
+	ScopedLock locker(m_cs);
+	if (b == true && m_pause_state == 0)
+	{
+		m_pause_state = 1;
+		return;
+	}
+	if (b == false && m_pause_state == 2)
+	{
+		m_pause_state = 3;
+		return;
+	}
+}
+
+bool StretchAudioSource::isPaused() const
+{
+	return m_pause_state > 0;
+}
+
 void StretchAudioSource::seekPercent(double pos)
 {
 	ScopedLock locker(m_cs);
diff --git a/Source/PS_Source/StretchSource.h b/Source/PS_Source/StretchSource.h
index 054f5f0..3b687cb 100644
--- a/Source/PS_Source/StretchSource.h
+++ b/Source/PS_Source/StretchSource.h
@@ -69,6 +69,9 @@ public:
 	void setFreezing(bool b) { m_freezing = b; }
 	bool isFreezing() { return m_freezing; }
 
+	void setPaused(bool b);
+	bool isPaused() const;
+
 	void seekPercent(double pos);
 	
 	double getOutputDurationSecondsForRange(Range<double> range, int fftsize);
@@ -122,6 +125,8 @@ private:
 	double m_seekpos = 0.0;
 	
 	bool m_freezing = false;
+	
+	int m_pause_state = 0;
 	Range<double> m_playrange{ 0.0,1.0 };
 	
 	bool m_stream_end_reached = false;
@@ -148,6 +153,7 @@ private:
 		int requested_fft_size = 0;
 		File requested_file;
 	} m_xfadetask;
+	int m_pause_fade_counter = 0;
 };
 
 class MultiStretchAudioSource final : public PositionableAudioSource
diff --git a/Source/PluginProcessor.cpp b/Source/PluginProcessor.cpp
index 4ce7cec..8ded68f 100644
--- a/Source/PluginProcessor.cpp
+++ b/Source/PluginProcessor.cpp
@@ -116,8 +116,9 @@ PaulstretchpluginAudioProcessor::PaulstretchpluginAudioProcessor()
 	addParameter(new AudioParameterFloat("filter_high_0", "Filter high", 20.0f, 20000.0f, 20000.0f)); // 24
 	addParameter(new AudioParameterFloat("onsetdetect_0", "Onset detection", 0.0f, 1.0f, 0.0f)); // 25
 	addParameter(new AudioParameterBool("capture_enabled0", "Capture", false)); // 26
-	m_outchansparam = new AudioParameterInt("numoutchans0", "Num output channels", 2, 8, 2);
+	m_outchansparam = new AudioParameterInt("numoutchans0", "Num output channels", 2, 8, 2); // 27
 	addParameter(m_outchansparam); // 27
+	addParameter(new AudioParameterBool("pause_enabled0", "Pause", false)); // 28
 	startTimer(1, 50);
 }
 
@@ -253,7 +254,7 @@ void PaulstretchpluginAudioProcessor::prepareToPlay(double sampleRate, int sampl
 	{
 		setFFTSize(*getFloatParameter(cpi_fftsize));
 		m_stretch_source->setProcessParameters(&m_ppar);
-		
+		m_stretch_source->setFFTWindowingType(1);
 		String err;
 		startplay({ *getFloatParameter(cpi_soundstart),*getFloatParameter(cpi_soundend) },
 		numoutchans, samplesPerBlock, err);
@@ -372,6 +373,7 @@ void PaulstretchpluginAudioProcessor::processBlock (AudioSampleBuffer& buffer, M
 		t1 = t0 + 0.001;
 	m_stretch_source->setPlayRange({ t0,t1 }, true);
 	m_stretch_source->setFreezing(getParameter(cpi_freeze));
+	m_stretch_source->setPaused(getParameter(cpi_pause_enabled));
 	m_stretch_source->setProcessParameters(&m_ppar);
 	
 	AudioSourceChannelInfo aif(buffer);
diff --git a/Source/PluginProcessor.h b/Source/PluginProcessor.h
index 4a78b9c..42ab56f 100644
--- a/Source/PluginProcessor.h
+++ b/Source/PluginProcessor.h
@@ -43,6 +43,7 @@ const int cpi_filter_high = 24;
 const int cpi_onsetdetection = 25;
 const int cpi_capture_enabled = 26;
 const int cpi_num_outchans = 27;
+const int cpi_pause_enabled = 28;
 
 class PaulstretchpluginAudioProcessor  : public AudioProcessor, public MultiTimer
 {