src/tools/dcpomatic_ecinema.cc

   1 /*
   2     Copyright (C) 2018-2019 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 #include "lib/version.h"
  22 #include "lib/decrypted_ecinema_kdm.h"
  23 #include "lib/config.h"
  24 #include "lib/util.h"
  25 #include <dcp/key.h>
  26 extern "C" {
  27 #include <libavformat/avformat.h>
  28 #include <libavutil/aes_ctr.h>
  29 }
  30 #include <boost/filesystem.hpp>
  31 #include <boost/optional.hpp>
  32 #include <openssl/rand.h>
  33 #include <getopt.h>
  34 #include <sys/stat.h>
  35 #include <sys/types.h>
  36 #include <string>
  37 #include <iostream>
  38
  39 using std::string;
  40 using std::cerr;
  41 using std::cout;
  42 using boost::optional;
  43
  44 static void
  45 help (string n)
  46 {
  47         cerr << "Syntax: " << n << " [OPTION] <FILE>\n"
  48              << "  -v, --version        show DCP-o-matic version\n"
  49              << "  -h, --help           show this help\n"
  50              << "  -o, --output         output directory\n"
  51              << "\n"
  52              << "<FILE> is the unencrypted .mp4 file.\n";
  53 }
  54
  55 int
  56 main (int argc, char* argv[])
  57 {
  58         optional<boost::filesystem::path> output;
  59
  60         int option_index = 0;
  61         while (true) {
  62                 static struct option long_options[] = {
  63                         { "version", no_argument, 0, 'v'},
  64                         { "help", no_argument, 0, 'h'},
  65                         { "output", required_argument, 0, 'o'},
  66                 };
  67
  68                 int c = getopt_long (argc, argv, "vho:", long_options, &option_index);
  69
  70                 if (c == -1) {
  71                         break;
  72                 }
  73
  74                 switch (c) {
  75                 case 'v':
  76                         cout << "dcpomatic version " << dcpomatic_version << " " << dcpomatic_git_commit << "\n";
  77                         exit (EXIT_SUCCESS);
  78                 case 'h':
  79                         help (argv[0]);
  80                         exit (EXIT_SUCCESS);
  81                 case 'o':
  82                         output = optarg;
  83                         break;
  84                 }
  85         }
  86
  87         if (optind >= argc) {
  88                 help (argv[0]);
  89                 exit (EXIT_FAILURE);
  90         }
  91
  92         if (!output) {
  93                 cerr << "You must specify --output-media or -o\n";
  94                 exit (EXIT_FAILURE);
  95         }
  96
  97         boost::filesystem::path input = argv[optind];
  98         boost::filesystem::path output_mp4 = *output / (input.filename().string() + ".ecinema");
  99
 100         if (!boost::filesystem::is_directory(*output)) {
 101                 boost::filesystem::create_directory (*output);
 102         }
 103
 104         av_register_all ();
 105
 106         AVFormatContext* input_fc = avformat_alloc_context ();
 107         if (avformat_open_input(&input_fc, input.string().c_str(), 0, 0) < 0) {
 108                 cerr << "Could not open input file\n";
 109                 exit (EXIT_FAILURE);
 110         }
 111
 112         if (avformat_find_stream_info (input_fc, 0) < 0) {
 113                 cerr << "Could not read stream information\n";
 114                 exit (EXIT_FAILURE);
 115         }
 116
 117         AVFormatContext* output_fc;
 118         avformat_alloc_output_context2 (&output_fc, av_guess_format("mp4", 0, 0), 0, 0);
 119
 120         for (uint32_t i = 0; i < input_fc->nb_streams; ++i) {
 121                 AVStream* is = input_fc->streams[i];
 122                 AVStream* os = avformat_new_stream (output_fc, is->codec->codec);
 123                 if (avcodec_copy_context (os->codec, is->codec) < 0) {
 124                         cerr << "Could not set up output stream.\n";
 125                         exit (EXIT_FAILURE);
 126                 }
 127
 128                 switch (os->codec->codec_type) {
 129                 case AVMEDIA_TYPE_VIDEO:
 130                         os->time_base = is->time_base;
 131                         os->avg_frame_rate = is->avg_frame_rate;
 132                         os->r_frame_rate = is->r_frame_rate;
 133                         os->sample_aspect_ratio = is->sample_aspect_ratio;
 134                         os->codec->time_base = is->codec->time_base;
 135                         os->codec->framerate = is->codec->framerate;
 136                         os->codec->pix_fmt = is->codec->pix_fmt;
 137                         break;
 138                 case AVMEDIA_TYPE_AUDIO:
 139                         os->codec->sample_fmt = is->codec->sample_fmt;
 140                         os->codec->bits_per_raw_sample = is->codec->bits_per_raw_sample;
 141                         os->codec->sample_rate = is->codec->sample_rate;
 142                         os->codec->channel_layout = is->codec->channel_layout;
 143                         os->codec->channels = is->codec->channels;
 144                         break;
 145                 default:
 146                         /* XXX */
 147                         break;
 148                 }
 149         }
 150
 151         if (avio_open2 (&output_fc->pb, output_mp4.string().c_str(), AVIO_FLAG_WRITE, 0, 0) < 0) {
 152                 cerr << "Could not open output file `" << output_mp4.string() << "'\n";
 153                 exit (EXIT_FAILURE);
 154         }
 155
 156         dcp::Key key (AES_CTR_KEY_SIZE);
 157         AVDictionary* options = 0;
 158         av_dict_set (&options, "encryption_key", key.hex().c_str(), 0);
 159         /* XXX: is this OK? */
 160         av_dict_set (&options, "encryption_kid", "00000000000000000000000000000000", 0);
 161         av_dict_set (&options, "encryption_scheme", "cenc-aes-ctr", 0);
 162
 163         string id = dcp::make_uuid ();
 164         if (av_dict_set(&output_fc->metadata, SWAROOP_ID_TAG, id.c_str(), 0) < 0) {
 165                 cerr << "Could not write ID to output.\n";
 166                 exit (EXIT_FAILURE);
 167         }
 168
 169         if (avformat_write_header (output_fc, &options) < 0) {
 170                 cerr << "Could not write header to output.\n";
 171                 exit (EXIT_FAILURE);
 172         }
 173
 174         AVPacket packet;
 175         while (av_read_frame(input_fc, &packet) >= 0) {
 176                 AVStream* is = input_fc->streams[packet.stream_index];
 177                 AVStream* os = output_fc->streams[packet.stream_index];
 178                 packet.pts = av_rescale_q_rnd(packet.pts, is->time_base, os->time_base, (AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 179                 packet.dts = av_rescale_q_rnd(packet.dts, is->time_base, os->time_base, (AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 180                 packet.duration = av_rescale_q(packet.duration, is->time_base, os->time_base);
 181                 packet.pos = -1;
 182                 if (av_interleaved_write_frame (output_fc, &packet) < 0) {
 183                         cerr << "Could not write frame to output.\n";
 184                         exit (EXIT_FAILURE);
 185                 }
 186         }
 187
 188         av_write_trailer (output_fc);
 189
 190         avformat_free_context (input_fc);
 191         avformat_free_context (output_fc);
 192
 193         DecryptedECinemaKDM decrypted_kdm (id, key);
 194         EncryptedECinemaKDM encrypted_kdm = decrypted_kdm.encrypt (Config::instance()->decryption_chain()->leaf());
 195         cout << encrypted_kdm.as_xml() << "\n";
 196 }