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", dcp::PictureAsset::Behaviour::MAKE_NEW);
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);
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 auto sound_writer = sound_asset->start_write("DCP/sound.mxf", {}, dcp::SoundAsset::AtmosSync::DISABLED, dcp::SoundAsset::MCASubDescriptors::ENABLED);
79 /* Write some sine waves */
80 std::array<float, 48000> left;
81 std::array<float, 48000> right;
82 for (int i = 0; i < 48000; ++i) {
83 left[i] = sin(2 * M_PI * i * 440 / 48000) * 0.25;
84 right[i] = sin(2 * M_PI * i * 880 / 48000) * 0.25;
86 std::array<float*, 2> audio;
87 audio[0] = left.data();
88 audio[1] = right.data();
89 sound_writer->write(audio.data(), 2, 48000);
92 sound_writer->finalize();
94 /* Now create a reel */
95 auto reel = std::make_shared<dcp::Reel>();
97 /* Add picture and sound to it. The zeros are the `entry points', i.e. the first
98 (video) frame from the assets that the reel should play.
100 reel->add(std::make_shared<dcp::ReelMonoPictureAsset>(picture_asset, 0));
101 reel->add(std::make_shared<dcp::ReelSoundAsset>(sound_asset, 0));
103 /* Make a CPL with this reel */
104 auto cpl = std::make_shared<dcp::CPL>("My film", dcp::ContentKind::FEATURE, dcp::Standard::SMPTE);
108 auto dcp = dcp::DCP("DCP");