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 +1,88 @@
+/***
+
+  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 "timecodemetadata.h"
+
+#include <limits>
+#include <numeric>
+
+#include "olive/core/util/timecodefunctions.h"
+
+namespace olive
+{
+
+TimecodeMetadata::SourceTime TimecodeMetadata::FromTimecodeString(
+	const QString &timecode, const core::rational &timebase)
+{
+	SourceTime result;
+	const QString trimmed = timecode.trimmed();
+	if (trimmed.isEmpty()) {
+		return result;
+	}
+
+	bool ok = false;
+	const core::Timecode::Display display =
+		trimmed.contains(';') ? core::Timecode::kTimecodeDropFrame
+							  : core::Timecode::kTimecodeNonDropFrame;
+	result.time = core::Timecode::timecode_to_time(trimmed.toStdString(),
+												   timebase, display, &ok);
+	result.valid = ok;
+	if (ok) {
+		result.source = QStringLiteral("timecode");
+	}
+	return result;
+}
+
+TimecodeMetadata::SourceTime TimecodeMetadata::FromBwfTimeReference(
+	const QString &time_reference, int sample_rate)
+{
+	SourceTime result;
+	if (sample_rate <= 0) {
+		return result;
+	}
+
+	bool ok = false;
+	const qulonglong samples = time_reference.trimmed().toULongLong(&ok);
+	if (!ok) {
+		return result;
+	}
+
+	qulonglong numerator = samples;
+	qulonglong denominator = static_cast<qulonglong>(sample_rate);
+	const qulonglong divisor = std::gcd(numerator, denominator);
+	numerator /= divisor;
+	denominator /= divisor;
+
+	const qulonglong rational_limit =
+		static_cast<qulonglong>(std::numeric_limits<int>::max());
+	if (numerator <= rational_limit && denominator <= rational_limit) {
+		result.time =
+			core::rational(static_cast<int>(numerator),
+						   static_cast<int>(denominator));
+	} else {
+		result.time = core::rational::fromDouble(
+			static_cast<double>(samples) / static_cast<double>(sample_rate));
+	}
+	result.source = QStringLiteral("bwf_time_reference");
+	result.valid = true;
+	return result;
+}
+
+}