2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
6 libdcp 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 libdcp 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 libdcp. If not, see <http://www.gnu.org/licenses/>.
20 /** @file examples/make_dcp.cc
21 * @brief Shows how to make a DCP from some JPEG2000 and audio data.
27 /* If you are using an installed libdcp, these #includes would need to be changed to
30 #include <dcp/mono_picture_asset.h>
36 #include "mono_picture_asset.h"
37 #include "mono_picture_asset_writer.h"
38 #include "sound_asset.h"
39 #include "sound_asset_writer.h"
41 #include "reel_mono_picture_asset.h"
42 #include "reel_sound_asset.h"
51 /* Create a directory to put the DCP in */
52 boost::filesystem::create_directory ("DCP");
54 /* Make a picture asset. This is a file which combines JPEG2000 files together to make
55 up the video of the DCP. First, create the object, specifying a frame rate of 24 frames
59 auto picture_asset = std::make_shared<dcp::MonoPictureAsset>(dcp::Fraction (24, 1), dcp::Standard::SMPTE);
61 /* Start off a write to it */
62 auto picture_writer = picture_asset->start_write("DCP/picture.mxf", false);
64 /* Write 24 frames of the same JPEG2000 file */
65 dcp::ArrayData picture("examples/help.j2c");
66 for (int i = 0; i < 24; ++i) {
67 picture_writer->write (picture.data(), picture.size());
71 picture_writer->finalize();
73 /* Now create a sound MXF. As before, create an object and a writer.
74 When creating the object we specify the sampling rate (48kHz) and the number of channels (2).
76 auto sound_asset = std::make_shared<dcp::SoundAsset>(dcp::Fraction(24, 1), 48000, 2, dcp::LanguageTag("en-GB"), dcp::Standard::SMPTE);
77 /* Here we must also say which of our channels will have "real" sound data in them */
78 std::vector<dcp::Channel> active_channels;
79 active_channels.push_back(dcp::Channel::LEFT);
80 active_channels.push_back(dcp::Channel::RIGHT);
81 auto sound_writer = sound_asset->start_write("DCP/sound.mxf", active_channels);
83 /* Write some sine waves */
85 audio[0] = new float[48000];
86 audio[1] = new float[48000];
87 for (int i = 0; i < 48000; ++i) {
88 audio[0][i] = sin (2 * M_PI * i * 440 / 48000) * 0.25;
89 audio[1][i] = sin (2 * M_PI * i * 880 / 48000) * 0.25;
91 sound_writer->write (audio, 48000);
96 sound_writer->finalize ();
98 /* Now create a reel */
99 auto reel = std::make_shared<dcp::Reel>();
101 /* Add picture and sound to it. The zeros are the `entry points', i.e. the first
102 (video) frame from the assets that the reel should play.
104 reel->add (std::make_shared<dcp::ReelMonoPictureAsset>(picture_asset, 0));
105 reel->add (std::make_shared<dcp::ReelSoundAsset>(sound_asset, 0));
107 /* Make a CPL with this reel */
108 auto cpl = std::make_shared<dcp::CPL>("My film", dcp::ContentKind::FEATURE);
112 dcp::DCP dcp ("DCP");
114 dcp.write_xml (dcp::Standard::SMPTE);