From 0a52b325f4e1eaf39be65a24f9a594ffe1f66e79 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 10 Jul 2016 02:40:24 +0200
Subject: [PATCH] align stem-export (raw track outputs (with and w/p
 processing)

---
 libs/ardour/ardour/capturing_processor.h |  6 +++++-
 libs/ardour/capturing_processor.cc       | 15 ++++++++++++---
 libs/ardour/route.cc                     |  4 +++-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/libs/ardour/ardour/capturing_processor.h b/libs/ardour/ardour/capturing_processor.h
index b5cdc8739c..dccb7eb99e 100644
--- a/libs/ardour/ardour/capturing_processor.h
+++ b/libs/ardour/ardour/capturing_processor.h
@@ -20,14 +20,16 @@
 #ifndef __ardour_capturing_processor_h__
 #define __ardour_capturing_processor_h__
 
+#include "ardour/fixed_delay.h"
 #include "ardour/processor.h"
+#include "ardour/types.h"
 
 namespace ARDOUR {
 
 class LIBARDOUR_API CapturingProcessor : public Processor
 {
   public:
-	CapturingProcessor (Session & session);
+	CapturingProcessor (Session & session, framecnt_t latency);
 	~CapturingProcessor();
 
   public: // main interface
@@ -47,6 +49,8 @@ class LIBARDOUR_API CapturingProcessor : public Processor
 
 	framecnt_t block_size;
 	BufferSet capture_buffers;
+	FixedDelay _delaybuffers;
+	framecnt_t _latency;
 };
 
 } // namespace ARDOUR
diff --git a/libs/ardour/capturing_processor.cc b/libs/ardour/capturing_processor.cc
index 755a00c4c4..8951bee487 100644
--- a/libs/ardour/capturing_processor.cc
+++ b/libs/ardour/capturing_processor.cc
@@ -26,9 +26,10 @@
 
 namespace ARDOUR {
 
-CapturingProcessor::CapturingProcessor (Session & session)
+CapturingProcessor::CapturingProcessor (Session & session, framecnt_t latency)
 	: Processor (session, X_("capture point"))
 	, block_size (AudioEngine::instance()->samples_per_cycle())
+	, _latency (latency)
 {
 	realloc_buffers ();
 }
@@ -48,8 +49,14 @@ CapturingProcessor::set_block_size (pframes_t nframes)
 void
 CapturingProcessor::run (BufferSet& bufs, framepos_t, framepos_t, double, pframes_t nframes, bool)
 {
-	if (active()) {
-		capture_buffers.read_from (bufs, nframes);
+	if (!active()) {
+		_delaybuffers.flush ();
+		return;
+	}
+	for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
+		for (uint32_t b = 0; b < bufs.count().get (*t); ++b) {
+			_delaybuffers.delay (*t, b, capture_buffers.get (*t, b), bufs.get (*t, b), nframes, 0, 0);
+		}
 	}
 }
 
@@ -57,6 +64,7 @@ bool
 CapturingProcessor::configure_io (ChanCount in, ChanCount out)
 {
 	Processor::configure_io (in, out);
+	_delaybuffers.set (out, _latency);
 	realloc_buffers();
 	return true;
 }
@@ -72,6 +80,7 @@ void
 CapturingProcessor::realloc_buffers()
 {
 	capture_buffers.ensure_buffers (_configured_input, block_size);
+	_delaybuffers.flush ();
 }
 
 XMLNode &
diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 56cd04d84a..fa564968ed 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -3716,7 +3716,9 @@ Route::add_export_point()
 		Glib::Threads::Mutex::Lock lx (AudioEngine::instance()->process_lock ());
 		Glib::Threads::RWLock::WriterLock lw (_processor_lock);
 
-		_capturing_processor.reset (new CapturingProcessor (_session));
+		// this aligns all tracks; but not tracks + busses
+		assert (_session.worst_track_latency () >= _initial_delay);
+		_capturing_processor.reset (new CapturingProcessor (_session, _session.worst_track_latency () - _initial_delay));
 		_capturing_processor->activate ();
 
 		configure_processors_unlocked (0, &lw);