# HG changeset patch
# User Chris Cannam
# Date 1476710303 -3600
# Node ID 5a1198083d9ae2fed19a54f19be4d793089b7ea1
# Parent  584b2d7d7cd936fef740fa45be911634e1cade2e
Pull out model creation into the transformer thread run(), so that all communications with the plugin server happen on a single thread. Then make the model accessor wait for them to be created (which still happens right at the start of processing) before returning.

diff -r 584b2d7d7cd9 -r 5a1198083d9a transform/FeatureExtractionModelTransformer.cpp
--- a/transform/FeatureExtractionModelTransformer.cpp	Fri Oct 14 16:23:04 2016 +0100
+++ b/transform/FeatureExtractionModelTransformer.cpp	Mon Oct 17 14:18:23 2016 +0100
@@ -42,17 +42,19 @@
 FeatureExtractionModelTransformer::FeatureExtractionModelTransformer(Input in,
                                                                      const Transform &transform) :
     ModelTransformer(in, transform),
-    m_plugin(0)
+    m_plugin(0),
+    m_haveOutputs(false)
 {
     SVDEBUG << "FeatureExtractionModelTransformer::FeatureExtractionModelTransformer: plugin " << m_transforms.begin()->getPluginIdentifier() << ", outputName " << m_transforms.begin()->getOutput() << endl;
 
-    initialise();
+//    initialise();
 }
 
 FeatureExtractionModelTransformer::FeatureExtractionModelTransformer(Input in,
                                                                      const Transforms &transforms) :
     ModelTransformer(in, transforms),
-    m_plugin(0)
+    m_plugin(0),
+    m_haveOutputs(false)
 {
     if (m_transforms.empty()) {
         SVDEBUG << "FeatureExtractionModelTransformer::FeatureExtractionModelTransformer: " << transforms.size() << " transform(s)" << endl;
@@ -60,7 +62,7 @@
         SVDEBUG << "FeatureExtractionModelTransformer::FeatureExtractionModelTransformer: " << transforms.size() << " transform(s), first has plugin " << m_transforms.begin()->getPluginIdentifier() << ", outputName " << m_transforms.begin()->getOutput() << endl;
     }
     
-    initialise();
+//    initialise();
 }
 
 static bool
@@ -104,6 +106,9 @@
         return false;
     }
 
+    cerr << "instantiating plugin for transform in thread "
+         << QThread::currentThreadId() << endl;
+    
     m_plugin = factory->instantiatePlugin(pluginId, input->getSampleRate());
     if (!m_plugin) {
         m_message = tr("Failed to instantiate plugin \"%1\"").arg(pluginId);
@@ -220,6 +225,11 @@
         createOutputModels(j);
     }
 
+    m_outputMutex.lock();
+    m_haveOutputs = true;
+    m_outputsCondition.wakeAll();
+    m_outputMutex.unlock();
+
     return true;
 }
 
@@ -479,6 +489,16 @@
     }
 }
 
+void
+FeatureExtractionModelTransformer::awaitOutputModels()
+{
+    m_outputMutex.lock();
+    while (!m_haveOutputs) {
+        m_outputsCondition.wait(&m_outputMutex);
+    }
+    m_outputMutex.unlock();
+}
+
 FeatureExtractionModelTransformer::~FeatureExtractionModelTransformer()
 {
 //    SVDEBUG << "FeatureExtractionModelTransformer::~FeatureExtractionModelTransformer()" << endl;
@@ -566,6 +586,8 @@
 void
 FeatureExtractionModelTransformer::run()
 {
+    initialise();
+    
     DenseTimeValueModel *input = getConformingInput();
     if (!input) return;
 
@@ -709,6 +731,9 @@
 
         if (m_abandoned) break;
 
+    cerr << "calling process() from thread "
+         << QThread::currentThreadId() << endl;
+    
 	Vamp::Plugin::FeatureSet features = m_plugin->process
 	    (buffers, RealTime::frame2RealTime(blockFrame, sampleRate).toVampRealTime());
 
diff -r 584b2d7d7cd9 -r 5a1198083d9a transform/FeatureExtractionModelTransformer.h
--- a/transform/FeatureExtractionModelTransformer.h	Fri Oct 14 16:23:04 2016 +0100
+++ b/transform/FeatureExtractionModelTransformer.h	Mon Oct 17 14:18:23 2016 +0100
@@ -19,6 +19,8 @@
 #include "ModelTransformer.h"
 
 #include <QString>
+#include <QMutex>
+#include <QWaitCondition>
 
 #include <vamp-hostsdk/Plugin.h>
 
@@ -74,7 +76,12 @@
     void getFrames(int channelCount, sv_frame_t startFrame, sv_frame_t size,
                    float **buffer);
 
-    // just casts
+    bool m_haveOutputs;
+    QMutex m_outputMutex;
+    QWaitCondition m_outputsCondition;
+    void awaitOutputModels();
+    
+    // just casts:
 
     DenseTimeValueModel *getConformingInput();
 
diff -r 584b2d7d7cd9 -r 5a1198083d9a transform/ModelTransformer.h
--- a/transform/ModelTransformer.h	Fri Oct 14 16:23:04 2016 +0100
+++ b/transform/ModelTransformer.h	Mon Oct 17 14:18:23 2016 +0100
@@ -89,16 +89,20 @@
      * be initialised; an error message may be available via
      * getMessage() in this situation.
      */
-    Models getOutputModels() { return m_outputs; }
+    Models getOutputModels() {
+        awaitOutputModels();
+        return m_outputs;
+    }
 
     /**
      * Return the set of output models, also detaching them from the
      * transformer so that they will not be deleted when the
      * transformer is.  The caller takes ownership of the models.
      */
-    Models detachOutputModels() { 
+    Models detachOutputModels() {
+        awaitOutputModels();
         m_detached = true; 
-        return getOutputModels(); 
+        return m_outputs;
     }
 
     /**
@@ -138,6 +142,8 @@
     ModelTransformer(Input input, const Transform &transform);
     ModelTransformer(Input input, const Transforms &transforms);
 
+    virtual void awaitOutputModels() = 0;
+    
     Transforms m_transforms;
     Input m_input; // I don't own the model in this
     Models m_outputs; // I own this, unless...
diff -r 584b2d7d7cd9 -r 5a1198083d9a transform/RealTimeEffectModelTransformer.h
--- a/transform/RealTimeEffectModelTransformer.h	Fri Oct 14 16:23:04 2016 +0100
+++ b/transform/RealTimeEffectModelTransformer.h	Mon Oct 17 14:18:23 2016 +0100
@@ -31,6 +31,8 @@
 protected:
     virtual void run();
 
+    virtual void awaitOutputModels() { } // they're created synchronously
+    
     QString m_units;
     RealTimePluginInstance *m_plugin;
     int m_outputNo;