# HG changeset patch
# User Chris Cannam
# Date 1413385515 -3600
# Node ID 6b2a8b34e9d3d9a573af2ae303f33362e4c17784
# Parent  7d003fe48225c0fc4f811de075b4d7f0b9bc599b
Add setNofM logic which the JSON writer can use to write a list when sending multiple files' worth to a single target

diff -r 7d003fe48225 -r 6b2a8b34e9d3 transform/FeatureWriter.h
--- a/transform/FeatureWriter.h	Wed Oct 15 13:30:14 2014 +0100
+++ b/transform/FeatureWriter.h	Wed Oct 15 16:05:15 2014 +0100
@@ -79,8 +79,15 @@
         QString m_transformId;
     };
 
+    /**
+     * Notify the writer that we are about to start extraction for
+     * input file N of M (where N is 1..M). May be useful when writing
+     * multiple outputs into a single file where some syntactic
+     * element is needed to connect them.
+     */
+    virtual void setNofM(int /* N */, int /* M */) { }
+
     // may throw FailedToOpenFile or other exceptions
-
     virtual void write(QString trackid,
                        const Transform &transform,
                        const Vamp::Plugin::OutputDescriptor &output,