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/*
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:
case AV_PIX_FMT_RGBA:
{
uint8_t const* data = image->data()[0] + start_x * std::lround(image->bytes_per_pixel(0)) + 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;
}
case AV_PIX_FMT_YUV422P10LE:
{
uint16_t const* data = reinterpret_cast<uint16_t*>(image->data()[0] + (start_x * 2) + (start_y * image->stride()[0]));
for (int p = 0; p < pixels; ++p) {
/* Just using Y */
brightest = std::max(brightest, static_cast<double>(*data) / 1024);
data += rows ? 1 : (image->stride()[0] / 2);
}
break;
}
default:
throw PixelFormatError("guess_crop()", image->pixel_format());
}
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;
}
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