2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file src/dcp_video_frame.cc
23 * @brief A single frame of video destined for a DCP.
25 * Given an Image and some settings, this class knows how to encode
26 * the image to J2K either on the local host or on a remote server.
28 * Objects of this class are used for the queue that we keep
29 * of images that require encoding.
33 #include "compose.hpp"
36 #include "dcp_video.h"
37 #include "dcpomatic_log.h"
38 #include "dcpomatic_socket.h"
39 #include "encode_server_description.h"
40 #include "exceptions.h"
43 #include "player_video.h"
45 #include <libcxml/cxml.h>
46 #include <dcp/raw_convert.h>
47 #include <dcp/openjpeg_image.h>
48 #include <dcp/rgb_xyz.h>
49 #include <dcp/j2k_transcode.h>
50 #include <dcp/warnings.h>
51 LIBDCP_DISABLE_WARNINGS
52 #include <libxml++/libxml++.h>
53 LIBDCP_ENABLE_WARNINGS
54 #include <boost/asio.hpp>
55 #include <boost/thread.hpp>
64 using std::make_shared;
65 using std::shared_ptr;
68 using dcp::raw_convert;
69 #if BOOST_VERSION >= 106100
70 using namespace boost::placeholders;
74 #define DCI_COEFFICENT (48.0 / 52.37)
77 /** Construct a DCP video frame.
78 * @param frame Input frame.
79 * @param index Index of the frame within the DCP.
80 * @param bw J2K bandwidth to use (see Config::j2k_bandwidth ())
83 shared_ptr<const PlayerVideo> frame, int index, int dcp_fps, int bw, Resolution r
87 , _frames_per_second (dcp_fps)
94 DCPVideo::DCPVideo (shared_ptr<const PlayerVideo> frame, shared_ptr<const cxml::Node> node)
97 _index = node->number_child<int> ("Index");
98 _frames_per_second = node->number_child<int> ("FramesPerSecond");
99 _j2k_bandwidth = node->number_child<int> ("J2KBandwidth");
100 _resolution = Resolution (node->optional_number_child<int>("Resolution").get_value_or(static_cast<int>(Resolution::TWO_K)));
103 shared_ptr<dcp::OpenJPEGImage>
104 DCPVideo::convert_to_xyz (shared_ptr<const PlayerVideo> frame, dcp::NoteHandler note)
106 shared_ptr<dcp::OpenJPEGImage> xyz;
108 auto image = frame->image (bind(&PlayerVideo::keep_xyz_or_rgb, _1), VideoRange::FULL, false);
109 if (frame->colour_conversion()) {
110 xyz = dcp::rgb_to_xyz (
114 frame->colour_conversion().get(),
118 xyz = make_shared<dcp::OpenJPEGImage>(image->data()[0], image->size(), image->stride()[0]);
124 /** J2K-encode this frame on the local host.
125 * @return Encoded data.
128 DCPVideo::encode_locally () const
130 auto const comment = Config::instance()->dcp_j2k_comment();
133 /* This was empirically derived by a user: see #1902 */
134 int const minimum_size = 16384;
135 LOG_DEBUG_ENCODE("Using minimum frame size %1", minimum_size);
137 auto xyz = convert_to_xyz (_frame, boost::bind(&Log::dcp_log, dcpomatic_log.get(), _1, _2));
138 int noise_amount = 2;
141 enc = dcp::compress_j2k (
145 _frame->eyes() == Eyes::LEFT || _frame->eyes() == Eyes::RIGHT,
146 _resolution == Resolution::FOUR_K,
147 comment.empty() ? "libdcp" : comment
150 if (enc.size() >= minimum_size) {
151 LOG_DEBUG_ENCODE(N_("Frame %1 encoded size was OK (%2)"), _index, enc.size());
155 LOG_GENERAL (N_("Frame %1 encoded size was small (%2); adding noise at level %3 with pixel skip %4"), _index, enc.size(), noise_amount, pixel_skip);
157 /* The JPEG2000 is too low-bitrate for some decoders <cough>DSS200</cough> so add some noise
158 * and try again. This is slow but hopefully won't happen too often. We have to do
159 * convert_to_xyz() again because compress_j2k() corrupts its xyz parameter.
162 xyz = convert_to_xyz (_frame, boost::bind(&Log::dcp_log, dcpomatic_log.get(), _1, _2));
163 auto size = xyz->size ();
164 auto pixels = size.width * size.height;
165 dcpomatic::RNG rng(42);
166 for (auto c = 0; c < 3; ++c) {
167 auto p = xyz->data(c);
168 auto e = xyz->data(c) + pixels;
170 *p = std::min(4095, std::max(0, *p + (rng.get() % noise_amount)));
175 if (pixel_skip > 1) {
180 /* Something's gone badly wrong if this much noise doesn't help */
181 DCPOMATIC_ASSERT (noise_amount < 16);
184 switch (_frame->eyes()) {
186 LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for mono"), _index);
189 LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for L"), _index);
192 LOG_DEBUG_ENCODE (N_("Finished locally-encoded frame %1 for R"), _index);
201 /** Send this frame to a remote server for J2K encoding, then read the result.
202 * @param serv Server to send to.
203 * @param timeout timeout in seconds.
204 * @return Encoded data.
207 DCPVideo::encode_remotely (EncodeServerDescription serv, int timeout) const
209 boost::asio::io_service io_service;
210 boost::asio::ip::tcp::resolver resolver (io_service);
211 boost::asio::ip::tcp::resolver::query query (serv.host_name(), raw_convert<string> (ENCODE_FRAME_PORT));
212 boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve (query);
214 auto socket = make_shared<Socket>(timeout);
215 socket->set_send_buffer_size (512 * 1024);
217 socket->connect (*endpoint_iterator);
219 /* Collect all XML metadata */
221 auto root = doc.create_root_node ("EncodingRequest");
222 root->add_child("Version")->add_child_text (raw_convert<string> (SERVER_LINK_VERSION));
225 LOG_DEBUG_ENCODE (N_("Sending frame %1 to remote"), _index);
228 Socket::WriteDigestScope ds (socket);
230 /* Send XML metadata */
231 auto xml = doc.write_to_string ("UTF-8");
232 socket->write (xml.length() + 1);
233 socket->write ((uint8_t *) xml.c_str(), xml.bytes() + 1);
235 /* Send binary data */
236 LOG_TIMING("start-remote-send thread=%1", thread_id ());
237 _frame->write_to_socket (socket);
240 /* Read the response (JPEG2000-encoded data); this blocks until the data
241 is ready and sent back.
243 Socket::ReadDigestScope ds (socket);
244 LOG_TIMING("start-remote-encode thread=%1", thread_id ());
245 ArrayData e (socket->read_uint32 ());
246 LOG_TIMING("start-remote-receive thread=%1", thread_id ());
247 socket->read (e.data(), e.size());
248 LOG_TIMING("finish-remote-receive thread=%1", thread_id ());
250 throw NetworkError ("Checksums do not match");
253 LOG_DEBUG_ENCODE (N_("Finished remotely-encoded frame %1"), _index);
259 DCPVideo::add_metadata (xmlpp::Element* el) const
261 el->add_child("Index")->add_child_text (raw_convert<string> (_index));
262 el->add_child("FramesPerSecond")->add_child_text (raw_convert<string> (_frames_per_second));
263 el->add_child("J2KBandwidth")->add_child_text (raw_convert<string> (_j2k_bandwidth));
264 el->add_child("Resolution")->add_child_text (raw_convert<string> (int (_resolution)));
265 _frame->add_metadata (el);
269 DCPVideo::eyes () const
271 return _frame->eyes ();
274 /** @return true if this DCPVideo is definitely the same as another;
275 * (apart from the frame index), false if it is probably not.
278 DCPVideo::same (shared_ptr<const DCPVideo> other) const
280 if (_frames_per_second != other->_frames_per_second ||
281 _j2k_bandwidth != other->_j2k_bandwidth ||
282 _resolution != other->_resolution) {
286 return _frame->same (other->_frame);