Implement audio sync foundations

2026-07-13 10:19:29 +08:00
parent 4d52267c4a
commit 08b1c6d562
21 changed files with 1094 additions and 18 deletions
@@ -0,0 +1,66 @@
+/***
+
+  Oak - Non-Linear Video Editor
+  Copyright (C) 2026 Oak Team
+
+  This program 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 3 of the License, or
+  (at your option) any later version.
+
+  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "audiosynchronizer.h"
+
+namespace olive
+{
+
+AudioSynchronizer::Placement AudioSynchronizer::PlaceBySourceTime(
+	const SourceClip &reference, const SourceClip &candidate,
+	const core::rational &reference_timeline_in)
+{
+	Placement placement;
+	if (!reference.has_source_start_time ||
+		!candidate.has_source_start_time ||
+		reference.source_start_time.isNaN() ||
+		candidate.source_start_time.isNaN()) {
+		return placement;
+	}
+
+	const core::rational reference_head_source =
+		reference.source_start_time + reference.media_in;
+	const core::rational candidate_head_source =
+		candidate.source_start_time + candidate.media_in;
+
+	placement.timeline_in =
+		reference_timeline_in + candidate_head_source - reference_head_source;
+	placement.valid = !placement.timeline_in.isNaN();
+	return placement;
+}
+
+AudioSynchronizer::Placement AudioSynchronizer::PlaceByWaveformOffset(
+	const core::rational &reference_timeline_in,
+	int64_t candidate_offset_samples, int sample_rate)
+{
+	Placement placement;
+	if (sample_rate <= 0) {
+		return placement;
+	}
+
+	placement.timeline_in =
+		reference_timeline_in +
+		core::rational::fromDouble(static_cast<double>(candidate_offset_samples) /
+								   static_cast<double>(sample_rate));
+	placement.valid = !placement.timeline_in.isNaN();
+	return placement;
+}
+
+}