More work on the AudioFilePreviewComponent, need to add samplerate conversions, volume control etc...

Source/PluginEditor.cpp

@@ -21,31 +21,6 @@ www.gnu.org/licenses
 #include <array>
 #include "RenderSettingsComponent.h"
 
-class AudioFilePreviewComponent : public FilePreviewComponent
-{
-public:
-	AudioFilePreviewComponent(PaulstretchpluginAudioProcessor* p) : m_proc(p) 
-	{
-		addAndMakeVisible(m_playbut);
-		m_playbut.setButtonText("Play");
-		m_playbut.onClick = [this]()
-		{
-			
-		};
-		setSize(100, 30);
-	}
-	void selectedFileChanged(const File &newSelectedFile) override
-	{
-	}
-	void resized() override
-	{
-		m_playbut.setBounds(0, 0, getWidth(), getHeight());
-	}
-private:
-	TextButton m_playbut;
-	PaulstretchpluginAudioProcessor* m_proc = nullptr;
-};
-
 //==============================================================================
 PaulstretchpluginAudioProcessorEditor::PaulstretchpluginAudioProcessorEditor(PaulstretchpluginAudioProcessor& p)
 	: AudioProcessorEditor(&p),
@@ -491,10 +466,12 @@ void PaulstretchpluginAudioProcessorEditor::chooseFile()
                                                 File::getSpecialLocation(File::userHomeDirectory).getFullPathName());
     File initialloc(initiallocfn);
 	String filterstring = processor.m_afm->getWildcardForAllFormats();
+	auto prevcomp = std::make_unique<AudioFilePreviewComponent>(&processor);
+	processor.setAudioPreview(prevcomp.get());
 	FileChooser myChooser("Please select audio file...",
 		initialloc,
-		filterstring,true);
-	if (myChooser.browseForFileToOpen())
+		filterstring,false);
+	if (myChooser.browseForFileToOpen(prevcomp.get()))
 	{
         File resu = myChooser.getResult();
         String pathname = resu.getFullPathName();
@@ -506,7 +483,7 @@ void PaulstretchpluginAudioProcessorEditor::chooseFile()
         processor.m_propsfile->m_props_file->setValue("importfilefolder", resu.getParentDirectory().getFullPathName());
         m_last_err = processor.setAudioFile(resu);
 	}
-	
+	processor.setAudioPreview(nullptr);
 }
 
 void PaulstretchpluginAudioProcessorEditor::showSettingsMenu()
@@ -1567,3 +1544,14 @@ void FreeFilterComponent::updateParameterComponents()
 	for (auto& e : m_parcomps)
 		e->updateComponent();
 }
+
+void AudioFilePreviewComponent::processBlock(double sr, AudioBuffer<float>& buf)
+{
+	if (m_reader != nullptr)
+	{
+		m_reader->read(&buf, 0, buf.getNumSamples(), m_playpos, true, true);
+		m_playpos += buf.getNumSamples();
+		if (m_playpos >= m_reader->lengthInSamples)
+			m_playpos = 0;
+	}
+}

Source/PluginEditor.h

@@ -264,6 +264,41 @@ private:
 	
 };
 
+class AudioFilePreviewComponent : public FilePreviewComponent
+{
+public:
+	AudioFilePreviewComponent(PaulstretchpluginAudioProcessor* p) : m_proc(p)
+	{
+		addAndMakeVisible(m_playbut);
+		m_playbut.setButtonText("Play");
+		m_playbut.onClick = [this]()
+		{
+
+		};
+		setSize(100, 30);
+	}
+	void selectedFileChanged(const File &newSelectedFile) override
+	{
+		ScopedLock locker(m_proc->getCriticalSection());
+		m_reader = unique_from_raw(m_proc->m_afm->createReaderFor(newSelectedFile));
+		m_playpos = 0;
+	}
+	void resized() override
+	{
+		m_playbut.setBounds(0, 0, getWidth(), getHeight());
+	}
+	void togglePlay()
+	{
+
+	}
+	void processBlock(double sr, AudioBuffer<float>& buf);
+private:
+	TextButton m_playbut;
+	PaulstretchpluginAudioProcessor* m_proc = nullptr;
+	std::unique_ptr<AudioFormatReader> m_reader;
+	int64 m_playpos = 0;
+};
+
 class PaulstretchpluginAudioProcessorEditor  : public AudioProcessorEditor, 
 	public MultiTimer, public FileDragAndDropTarget, public DragAndDropContainer
 {

Source/PluginProcessor.cpp

@@ -652,6 +652,11 @@ void PaulstretchpluginAudioProcessor::processBlock (AudioSampleBuffer& buffer, M
 		m_input_buffer.copyFrom(i, 0, buffer, i, 0, buffer.getNumSamples());
     for (int i = totalNumInputChannels; i < totalNumOutputChannels; ++i)
         buffer.clear (i, 0, buffer.getNumSamples());
+	if (m_previewcomponent != nullptr)
+	{
+		m_previewcomponent->processBlock(getSampleRate(), buffer);
+		return;
+	}
 	if (m_prebuffering_inited == false)
 		return;
 	if (m_is_recording == true)
@@ -898,6 +903,12 @@ void PaulstretchpluginAudioProcessor::timerCallback(int id)
 	}
 }
 
+void PaulstretchpluginAudioProcessor::setAudioPreview(AudioFilePreviewComponent * afpc)
+{
+	ScopedLock locker(m_cs);
+	m_previewcomponent = afpc;
+}
+
 pointer_sized_int PaulstretchpluginAudioProcessor::handleVstPluginCanDo(int32 index, pointer_sized_int value, void * ptr, float opt)
 {
 	if (strcmp((char*)ptr, "xenakios") == 0)

Source/PluginProcessor.h

@@ -23,6 +23,7 @@ www.gnu.org/licenses
 #include <array>
 
 class MyThumbCache;
+class AudioFilePreviewComponent;
 
 const int cpi_main_volume = 0;
 const int cpi_stretchamount = 1;
@@ -204,7 +205,8 @@ public:
     int m_prepare_count = 0;
     shared_envelope m_free_filter_envelope;
 	bool m_import_dlg_open = false;
-	
+	void setAudioPreview(AudioFilePreviewComponent* afpc);
+	CriticalSection& getCriticalSection() { return m_cs; }
 	pointer_sized_int handleVstPluginCanDo(int32 index,
 		pointer_sized_int value,
 		void* ptr,
@@ -261,6 +263,7 @@ private:
 	void updateStretchParametersFromPluginParameters(ProcessParameters& pars);
 	std::array<AudioParameterBool*, 9> m_sm_enab_pars;
 	bool m_lastrewind = false;
+	AudioFilePreviewComponent* m_previewcomponent = nullptr;
 	//==============================================================================
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PaulstretchpluginAudioProcessor)
 };