--- /dev/null
+/*
+ Copyright (C) 2021 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 "decoder.h"
+#include "decoder_factory.h"
+#include "image_proxy.h"
+#include "guess_crop.h"
+#include "image.h"
+#include "video_decoder.h"
+
+
+using std::shared_ptr;
+using namespace dcpomatic;
+
+
+Crop
+guess_crop (shared_ptr<const Image> image, double threshold)
+{
+ auto const width = image->size().width;
+ auto const height = image->size().height;
+
+ auto image_in_line = [image, threshold](int start_x, int start_y, int pixels, bool rows) {
+ double brightest = 0;
+
+ switch (image->pixel_format()) {
+ case AV_PIX_FMT_RGB24:
+ {
+ uint8_t const* data = image->data()[0] + start_x * 3 + start_y * image->stride()[0];
+ for (int p = 0; p < pixels; ++p) {
+ /* Averaging R, G and B */
+ brightest = std::max(brightest, static_cast<double>(data[0] + data[1] + data[2]) / (3 * 256));
+ data += rows ? 3 : image->stride()[0];
+ }
+ break;
+ }
+ case AV_PIX_FMT_YUV420P:
+ {
+ uint8_t const* data = image->data()[0] + start_x + start_y * image->stride()[0];
+ for (int p = 0; p < pixels; ++p) {
+ /* Just using Y */
+ brightest = std::max(brightest, static_cast<double>(*data) / 256);
+ data += rows ? 1 : image->stride()[0];
+ }
+ break;
+ }
+ default:
+ DCPOMATIC_ASSERT (false);
+ }
+
+ return brightest > threshold;
+ };
+
+ auto crop = Crop{};
+
+ for (auto y = 0; y < height; ++y) {
+ if (image_in_line(0, y, width, true)) {
+ crop.top = y;
+ break;
+ }
+ }
+
+ for (auto y = height - 1; y >= 0; --y) {
+ if (image_in_line(0, y, width, true)) {
+ crop.bottom = height - 1 - y;
+ break;
+ }
+ }
+
+ for (auto x = 0; x < width; ++x) {
+ if (image_in_line(x, 0, height, false)) {
+ crop.left = x;
+ break;
+ }
+ }
+
+ for (auto x = width - 1; x >= 0; --x) {
+ if (image_in_line(x, 0, height, false)) {
+ crop.right = width - 1 - x;
+ break;
+ }
+ }
+
+ return crop;
+}
+
+
+/** @param position Time within the content to get a video frame from when guessing the crop */
+Crop
+guess_crop (shared_ptr<const Film> film, shared_ptr<const Content> content, double threshold, ContentTime position)
+{
+ DCPOMATIC_ASSERT (content->video);
+
+ auto decoder = decoder_factory (film, content, false, false, {});
+ DCPOMATIC_ASSERT (decoder->video);
+
+ bool done = false;
+ auto crop = Crop{};
+
+ auto handle_video = [&done, &crop, threshold](ContentVideo video) {
+ crop = guess_crop(video.image->image(Image::Alignment::COMPACT).image, threshold);
+ done = true;
+ };
+
+ decoder->video->Data.connect (handle_video);
+ decoder->seek (position, false);
+
+ int tries_left = 50;
+ while (!done && tries_left >= 0) {
+ decoder->pass();
+ --tries_left;
+ }
+
+ return crop;
+}
+
--- /dev/null
+/*
+ Copyright (C) 2021 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 "dcpomatic_time.h"
+#include "types.h"
+#include <memory>
+
+
+class Content;
+class Film;
+class Image;
+
+
+Crop guess_crop (std::shared_ptr<const Image> image, double threshold);
+Crop guess_crop (std::shared_ptr<const Film> fillm, std::shared_ptr<const Content> content, double threshold, dcpomatic::ContentTime position);
+
--- /dev/null
+/*
+ Copyright (C) 2021 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 "lib/content.h"
+#include "lib/content_factory.h"
+#include "lib/guess_crop.h"
+#include "lib/types.h"
+#include "lib/video_content.h"
+#include "test.h"
+#include <boost/test/unit_test.hpp>
+#include <iostream>
+#include <vector>
+
+
+using namespace dcpomatic;
+
+
+BOOST_AUTO_TEST_CASE (guess_crop_image_test1)
+{
+ auto content = content_factory(TestPaths::private_data() / "arrietty_724.tiff").front();
+ auto film = new_test_film2 ("guess_crop_image_test1", { content });
+
+ BOOST_CHECK (
+ guess_crop(film, content, 0.1, ContentTime::from_frames(content->video->length(), content->video_frame_rate().get()))
+ == Crop(0, 0, 11, 11)
+ );
+}
+
+
+BOOST_AUTO_TEST_CASE (guess_crop_image_test2)
+{
+ auto content = content_factory(TestPaths::private_data() / "prophet_frame.tiff").front();
+ auto film = new_test_film2 ("guess_crop_image_test2", { content });
+
+ BOOST_CHECK (
+ guess_crop(film, content, 0.1, ContentTime::from_frames(content->video->length(), content->video_frame_rate().get()))
+ == Crop(0, 0, 22, 22)
+ );
+}
+
+
+BOOST_AUTO_TEST_CASE (guess_crop_image_test3)
+{
+ auto content = content_factory(TestPaths::private_data() / "pillarbox.png").front();
+ auto film = new_test_film2 ("guess_crop_image_test3", { content });
+
+ BOOST_CHECK (
+ guess_crop(film, content, 0.1, ContentTime::from_frames(content->video->length(), content->video_frame_rate().get()))
+ == Crop(113, 262, 0, 0)
+ );
+}