comparison transform/TransformFactory.h @ 64:4d59dc469b0f

* Ensure plugin parameters for a transform are saved in the .sv file and
  restored in case the plugin has to be run again
* Make plugin dialog offer options for mixdown/single-channel use if the
  file has more than one channels but the plugin only accepts one
* Fix incorrect samplerate playback for second file loaded if its samplerate
  differed from first
* Add Zoom to Fit and Select Visible Range menu options, split out Import
  Audio into main model and secondary model options
* Add stubs for cut, copy and paste operations (not implemented yet)

      * Get a configuration XML string for the given transform (by
      * asking the user, most likely).  Returns true if the transform
      * is acceptable, false if the operation should be cancelled.
      */
     bool getConfigurationForTransform(TransformName name, Model *inputModel,
+                                      int &channel,
                                       QString &configurationXml);
 
     /**
      * Return the output model resulting from applying the named
      * transform to the given input model.  The transform may still be

      * 
      * The returned model is owned by the caller and must be deleted
      * when no longer needed.
      */
     Model *transform(TransformName name, Model *inputModel,
-                     QString configurationXml = "");
+                     int channel, QString configurationXml = "");
 
     /**
      * Full description of a transform, suitable for putting on a menu.
      */
     QString getTransformDescription(TransformName name);

      * i.e. if getConfigurationForTransform can ever return a non-trivial
      * (not equivalent to empty) configuration string.
      */
     bool isTransformConfigurable(TransformName name);
 
+    /**
+     * If the transform has a prescribed number or range of channel
+     * inputs, return true and set minChannels and maxChannels to the
+     * minimum and maximum number of channel inputs the transform can
+     * accept.
+     */
+    bool getTransformChannelRange(TransformName name,
+                                  int &minChannels, int &maxChannels);
+
     //!!! Need some way to indicate that the input model has changed /
     //been deleted so as not to blow up backgrounded transform!  -- Or
     //indeed, if the output model has been deleted -- could equally
     //well happen!
 

 protected slots:
     void transformFinished();
 
 protected:
     Transform *createTransform(TransformName name, Model *inputModel,
-                               QString configurationXml, bool start);
+                               int channel, QString configurationXml, bool start);
 
     struct TransformIdent
     {
         TransformName name;
         QString configurationXml;