comparison data/model/Model.h @ 1453:4b496a258782

Merge from branch streaming-csv-writer

      * Return the first audio frame spanned by the model.
      */
     virtual sv_frame_t getStartFrame() const = 0;
 
     /**
-     * Return the last audio frame spanned by the model.
+     * Return the audio frame at the end of the model, i.e. 1 more
+     * than the final frame contained within the model. The end frame
+     * minus the start frame should yield the total duration in frames
+     * spanned by the model. This is consistent with the definition of
+     * the end frame of a Selection object.
      */
     virtual sv_frame_t getEndFrame() const = 0;
 
     /**
      * Return the frame rate in frames per second.

     /**
      * Return the type of the model.  For display purposes only.
      */
     virtual QString getTypeName() const = 0;
 
+    /**
+     * Return true if this is a sparse model.
+     */
+    virtual bool isSparse() const { return false; }
+    
     /**
      * Mark the model as abandoning. This means that the application
      * no longer needs it, so it can stop doing any background
      * calculations it may be involved in. Note that as far as the
      * model API is concerned, this does nothing more than tell the

                        QString indent = "",
                        QString extraAttributes = "") const;
 
     virtual QString toDelimitedDataString(QString delimiter) const {
         return toDelimitedDataStringSubset
-            (delimiter, getStartFrame(), getEndFrame() + 1);
+            (delimiter, getStartFrame(), getEndFrame());
     }
     virtual QString toDelimitedDataStringWithOptions(QString delimiter, DataExportOptions opts) const {
         return toDelimitedDataStringSubsetWithOptions
-            (delimiter, opts, getStartFrame(), getEndFrame() + 1);
+            (delimiter, opts, getStartFrame(), getEndFrame());
     }
     virtual QString toDelimitedDataStringSubset(QString, sv_frame_t /* f0 */, sv_frame_t /* f1 */) const {
         return "";
     }
     virtual QString toDelimitedDataStringSubsetWithOptions(QString delimiter, DataExportOptions, sv_frame_t f0, sv_frame_t f1) const {