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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 "config.h"
#include "dcp_video.h"
#include "dcpomatic_log.h"
#include "j2k_encoder_cpu_backend.h"
#include "player_video.h"
#include "rng.h"
#include <dcp/openjpeg_image.h>
#include <dcp/j2k_transcode.h>
#include "i18n.h"
using std::shared_ptr;
using std::vector;
using boost::optional;
#if BOOST_VERSION >= 106100
using namespace boost::placeholders;
#endif
vector<dcp::ArrayData>
J2KEncoderCPUBackend::encode (vector<DCPVideo> const& all_video)
{
DCPOMATIC_ASSERT (all_video.size() == 1);
auto video = all_video.front();
try {
auto const comment = Config::instance()->dcp_j2k_comment();
/* This was empirically derived by a user: see #1902 */
int const minimum_size = 16384;
LOG_GENERAL ("Using minimum frame size %1", minimum_size);
auto xyz = DCPVideo::convert_to_xyz (video.frame(), boost::bind(&Log::dcp_log, dcpomatic_log.get(), _1, _2));
int noise_amount = 2;
int pixel_skip = 16;
while (true) {
auto enc = dcp::compress_j2k (
xyz,
video.j2k_bandwidth(),
video.frames_per_second(),
video.frame()->eyes() == Eyes::LEFT || video.frame()->eyes() == Eyes::RIGHT,
video.resolution() == Resolution::FOUR_K,
comment.empty() ? "libdcp" : comment
);
if (enc.size() >= minimum_size) {
LOG_GENERAL (N_("Frame %1 encoded size was OK (%2)"), video.index(), enc.size());
return { enc };
}
LOG_GENERAL (N_("Frame %1 encoded size was small (%2); adding noise at level %3 with pixel skip %4"), video.index(), enc.size(), noise_amount, pixel_skip);
/* The JPEG2000 is too low-bitrate for some decoders <cough>DSS200</cough> so add some noise
* and try again. This is slow but hopefully won't happen too often. We have to do
* convert_to_xyz() again because compress_j2k() corrupts its xyz parameter.
*/
xyz = DCPVideo::convert_to_xyz (video.frame(), boost::bind(&Log::dcp_log, dcpomatic_log.get(), _1, _2));
auto const size = xyz->size ();
auto const pixels = size.width * size.height;
dcpomatic::RNG rng(42);
for (auto c = 0; c < 3; ++c) {
auto p = xyz->data(c);
auto e = xyz->data(c) + pixels;
while (p < e) {
*p = std::min(4095, std::max(0, *p + (rng.get() % noise_amount)));
p += pixel_skip;
}
}
if (pixel_skip > 1) {
--pixel_skip;
} else {
++noise_amount;
}
/* Something's gone badly wrong if this much noise doesn't help */
DCPOMATIC_ASSERT (noise_amount < 16);
}
switch (video.frame()->eyes()) {
case Eyes::BOTH:
LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for mono"), video.index());
break;
case Eyes::LEFT:
LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for L"), video.index());
break;
case Eyes::RIGHT:
LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for R"), video.index());
break;
default:
break;
}
} catch (std::exception& e) {
LOG_ERROR (N_("Local encode failed (%1)"), e.what());
}
return {};
}
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