Fix loop recording alignment

DiskWriter::transport_looped() is called from the session
when engine loops. This does not take local disk-reader run()
latency offset into account.

finish_capture() needs to be postponed until the disk-writer
itself reaches the loop-position. This is achieved by
postponing loop() and calling it once loop-length of samples
has been captured.

This works because engaging loop always seeks to the loop-position
and first loop resets _capture_captured.

1 files changed, 5 insertions, 0 deletions

diff --git a/libs/ardour/ardour/disk_writer.h b/libs/ardour/ardour/disk_writer.h
index c17c2e539e..fab54e2404 100644
--- a/libs/ardour/ardour/disk_writer.h
+++ b/libs/ardour/ardour/disk_writer.h
@@ -169,6 +169,8 @@ private:
 	void check_record_status (samplepos_t transport_sample, double speed, bool can_record);
 	void finish_capture (boost::shared_ptr<ChannelList> c);
 
+	void loop (samplepos_t);
+
 	CaptureInfos                 capture_info;
 	mutable Glib::Threads::Mutex capture_info_lock;
 
@@ -187,6 +189,9 @@ private:
 	volatile gint _num_captured_loops;
 	samplepos_t   _accumulated_capture_offset;
 
+	bool          _transport_looped;
+	samplepos_t   _transport_loop_sample;
+
 	boost::shared_ptr<SMFSource> _midi_write_source;
 
 	std::list<boost::shared_ptr<Source> >            _last_capture_sources;