src/lib/j2k_encoder_remote_backend.cc

   1 /*
   2     Copyright (C) 2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   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.
  10
  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.
  15
  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/>.
  18
  19 */
  20
  21
  22 #include "config.h"
  23 #include "cross.h"
  24 #include "dcp_video.h"
  25 #include "dcpomatic_log.h"
  26 #include "dcpomatic_socket.h"
  27 #include "j2k_encoder_remote_backend.h"
  28 #include "player_video.h"
  29 #include "warnings.h"
  30 #include <dcp/raw_convert.h>
  31 DCPOMATIC_DISABLE_WARNINGS
  32 #include <libxml++/libxml++.h>
  33 DCPOMATIC_ENABLE_WARNINGS
  34 #include <boost/asio.hpp>
  35
  36
  37 #include "i18n.h"
  38
  39
  40 using std::make_shared;
  41 using std::shared_ptr;
  42 using std::string;
  43 using std::unique_ptr;
  44 using boost::optional;
  45 using dcp::raw_convert;
  46
  47
  48 J2KEncoderRemoteBackend::J2KEncoderRemoteBackend (J2KEncoderRemoteBackend&& other)
  49         : _server (other._server)
  50         , _backoff (other._backoff)
  51 {
  52
  53 }
  54
  55
  56 optional<dcp::ArrayData>
  57 J2KEncoderRemoteBackend::encode (DCPVideo video)
  58 {
  59         try {
  60                 boost::asio::io_service io_service;
  61                 boost::asio::ip::tcp::resolver resolver (io_service);
  62                 boost::asio::ip::tcp::resolver::query query (_server.host_name(), raw_convert<string>(ENCODE_FRAME_PORT));
  63                 auto endpoint_iterator = resolver.resolve (query);
  64
  65                 auto socket = make_shared<Socket>(_timeout);
  66
  67                 socket->connect (*endpoint_iterator);
  68
  69                 /* Collect all XML metadata */
  70                 xmlpp::Document doc;
  71                 auto root = doc.create_root_node ("EncodingRequest");
  72                 root->add_child("Version")->add_child_text(raw_convert<string>(SERVER_LINK_VERSION));
  73                 video.add_metadata (root);
  74
  75                 LOG_DEBUG_ENCODE (N_("Sending frame %1 to remote"), video.index());
  76
  77                 {
  78                         Socket::WriteDigestScope ds (socket);
  79
  80                         /* Send XML metadata */
  81                         auto xml = doc.write_to_string ("UTF-8");
  82                         socket->write (xml.length() + 1);
  83                         socket->write (reinterpret_cast<uint8_t const*>(xml.c_str()), xml.bytes() + 1);
  84
  85                         /* Send binary data */
  86                         LOG_TIMING("start-remote-send thread=%1", thread_id());
  87                         video.frame()->write_to_socket(socket);
  88                 }
  89
  90                 /* Read the response (JPEG2000-encoded data); this blocks until the data
  91                    is ready and sent back.
  92                 */
  93                 Socket::ReadDigestScope ds (socket);
  94                 LOG_TIMING("start-remote-encode thread=%1", thread_id());
  95                 dcp::ArrayData enc(socket->read_uint32());
  96                 LOG_TIMING("start-remote-receive thread=%1", thread_id());
  97                 socket->read (enc.data(), enc.size());
  98                 LOG_TIMING("finish-remote-receive thread=%1", thread_id());
  99                 if (!ds.check()) {
 100                         throw NetworkError ("Checksums do not match");
 101                 }
 102
 103                 LOG_DEBUG_ENCODE (N_("Finished remotely-encoded frame %1"), video.index());
 104
 105                 _backoff = 0;
 106                 return enc;
 107
 108         } catch (std::exception& e) {
 109                 if (_backoff < 60) {
 110                         /* back off more */
 111                         _backoff += 10;
 112                 }
 113                 LOG_ERROR (
 114                         N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
 115                         video.index(), _server.host_name(), e.what(), _backoff
 116                         );
 117                 return {};
 118         }
 119
 120 }
 121