changeset 10:b6dc944128da

* Add basics of MIDI file import.  Doesn't actually create the model yet.
* Add rewind to start / ffwd to end.
* Make zoom constraint default to sqrt(2) type if no constraint set

--- a/audioio/AudioCallbackPlaySource.cpp	Wed Feb 08 17:59:16 2006 +0000
+++ b/audioio/AudioCallbackPlaySource.cpp	Thu Feb 09 18:01:52 2006 +0000
@@ -80,7 +80,7 @@
 void
 AudioCallbackPlaySource::addModel(Model *model)
 {
-    m_audioGenerator->addModel(model);
+    bool canPlay = m_audioGenerator->addModel(model);
 
     m_mutex.lock();
 
@@ -122,7 +122,7 @@
 	clearRingBuffers(true, modelChannels);
 	buffersChanged = true;
     } else {
-	clearRingBuffers(true);
+	if (canPlay) clearRingBuffers(true);
     }
 
     if (buffersChanged || srChanged) {

--- a/audioio/AudioGenerator.cpp	Wed Feb 08 17:59:16 2006 +0000
+++ b/audioio/AudioGenerator.cpp	Thu Feb 09 18:01:52 2006 +0000
@@ -38,7 +38,7 @@
 {
 }
 
-void
+bool
 AudioGenerator::addModel(Model *model)
 {
     if (m_sourceSampleRate == 0) {
@@ -52,12 +52,13 @@
 
 	if (dtvm) {
 	    m_sourceSampleRate = model->getSampleRate();
+	    return true;
 	}
     }
 
     SparseOneDimensionalModel *sodm =
 	dynamic_cast<SparseOneDimensionalModel *>(model);
-    if (!sodm) return; // nothing else to initialise
+    if (!sodm) return false; // nothing else to initialise
 
 //	QString pluginId = "dssi:/usr/lib/dssi/dssi-vst.so:FEARkILLERrev1.dll";
 //	QString pluginId = "dssi:/usr/lib/dssi/hexter.so:hexter";
@@ -71,7 +72,7 @@
     
     if (!factory) {
 	std::cerr << "Failed to get plugin factory" << std::endl;
-	return;
+	return false;
     }
 	
     RealTimePluginInstance *instance =
@@ -93,7 +94,10 @@
 	instance->setIdealChannelCount(m_targetChannelCount); // reset!
     } else {
 	std::cerr << "Failed to instantiate plugin" << std::endl;
+	return false;
     }
+
+    return true;
 }
 
 void

--- a/audioio/AudioGenerator.h	Wed Feb 08 17:59:16 2006 +0000
+++ b/audioio/AudioGenerator.h	Thu Feb 09 18:01:52 2006 +0000
@@ -30,8 +30,10 @@
     /**
      * Add a data model to be played from and initialise any
      * necessary audio generation code.
+     * Returns true if the model is of a type that we know how to play.
+     * (The model will be added regardless.)
      */
-    virtual void addModel(Model *model);
+    virtual bool addModel(Model *model);
 
     /**
      * Remove a model.