1 files changed, 100 insertions, 0 deletions
diff --git a/src/lib/trimmer.cc b/src/lib/trimmer.cc
new file mode 100644
index 000000000..68364e50a
--- /dev/null
+++ b/src/lib/trimmer.cc
@@ -0,0 +1,100 @@
+/*
+    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+
+    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 2 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, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <boost/shared_ptr.hpp>
+#include "trimmer.h"
+
+using std::cout;
+using std::max;
+using boost::shared_ptr;
+
+/** @param audio_sample_rate Audio sampling rate, or 0 if there is no audio */
+Trimmer::Trimmer (
+	shared_ptr<Log> log,
+	int video_trim_start,
+	int video_trim_end, int video_length,
+	int audio_sample_rate,
+	float frames_per_second,
+	int dcp_frames_per_second
+	)
+	: AudioVideoProcessor (log)
+	, _video_start (video_trim_start)
+	, _video_end (video_length - video_trim_end)
+	, _video_in (0)
+	, _audio_in (0)
+{
+	FrameRateConversion frc (frames_per_second, dcp_frames_per_second);
+
+	if (frc.skip) {
+		_video_start /= 2;
+		_video_end /= 2;
+	} else if (frc.repeat) {
+		_video_start *= 2;
+		_video_end *= 2;
+	}
+
+	if (audio_sample_rate) {
+		_audio_start = video_frames_to_audio_frames (_video_start, audio_sample_rate, frames_per_second);
+		_audio_end = video_frames_to_audio_frames (_video_end, audio_sample_rate, frames_per_second);
+	}
+}
+
+void
+Trimmer::process_video (shared_ptr<Image> image, bool same, shared_ptr<Subtitle> sub)
+{
+	if (_video_in >= _video_start && _video_in <= _video_end) {
+		Video (image, same, sub);
+	}
+	
+	++_video_in;
+}
+
+void
+Trimmer::process_audio (shared_ptr<AudioBuffers> audio)
+{
+	int64_t offset = _audio_start - _audio_in;
+	if (offset > audio->frames()) {
+		_audio_in += audio->frames ();
+		return;
+	}
+
+	if (offset < 0) {
+		offset = 0;
+	}
+
+	int64_t length = _audio_end - max (_audio_in, _audio_start);
+	if (length < 0) {
+		_audio_in += audio->frames ();
+		return;
+	}
+
+	if (length > (audio->frames() - offset)) {
+		length = audio->frames () - offset;
+	}
+
+	_audio_in += audio->frames ();
+	
+	if (offset != 0 || length != audio->frames ()) {
+		audio->move (offset, 0, length);
+		audio->set_frames (length);
+	}
+	
+	Audio (audio);
+}
+