Initial butler work.

1 files changed, 104 insertions, 0 deletions

diff --git a/src/lib/audio_ring_buffers.cc b/src/lib/audio_ring_buffers.cc
new file mode 100644
index 000000000..81072474e
--- /dev/null
+++ b/src/lib/audio_ring_buffers.cc
@@ -0,0 +1,104 @@
+/*
+    Copyright (C) 2016-2017 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "audio_ring_buffers.h"
+#include "dcpomatic_assert.h"
+#include "exceptions.h"
+#include <boost/foreach.hpp>
+
+using std::min;
+using std::cout;
+using boost::shared_ptr;
+
+AudioRingBuffers::AudioRingBuffers ()
+	: _used_in_head (0)
+{
+
+}
+
+void
+AudioRingBuffers::put (shared_ptr<const AudioBuffers> data, DCPTime time)
+{
+	boost::mutex::scoped_lock lm (_mutex);
+
+	if (!_buffers.empty ()) {
+		DCPOMATIC_ASSERT (_buffers.front()->channels() == data->channels());
+	}
+
+	_buffers.push_back (data);
+	_latest = time;
+}
+
+void
+AudioRingBuffers::get (float* out, int channels, int frames)
+{
+	boost::mutex::scoped_lock lm (_mutex);
+
+	while (frames > 0) {
+		if (_buffers.empty ()) {
+			for (int i = 0; i < frames; ++i) {
+				for (int j = 0; j < channels; ++j) {
+					*out++ = 0;
+				}
+			}
+			cout << "audio underrun; missing " << frames << "!\n";
+			return;
+		}
+
+		int const to_do = min (frames, _buffers.front()->frames() - _used_in_head);
+		float** p = _buffers.front()->data();
+		int const c = min (_buffers.front()->channels(), channels);
+		for (int i = 0; i < to_do; ++i) {
+			for (int j = 0; j < c; ++j) {
+				*out++ = p[j][i + _used_in_head];
+			}
+			for (int j = c; j < channels; ++j) {
+				*out++ = 0;
+			}
+		}
+		_used_in_head += to_do;
+		frames -= to_do;
+
+		if (_used_in_head == _buffers.front()->frames()) {
+			_buffers.pop_front ();
+			_used_in_head = 0;
+		}
+	}
+}
+
+void
+AudioRingBuffers::clear ()
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	_buffers.clear ();
+	_used_in_head = 0;
+	_latest = DCPTime ();
+}
+
+Frame
+AudioRingBuffers::size ()
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	Frame s = 0;
+	BOOST_FOREACH (shared_ptr<const AudioBuffers> i, _buffers) {
+		s += i->frames ();
+	}
+	return s - _used_in_head;
+}