2 Copyright (C) 2012-2014 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"
48 /* Create a directory to put the DCP in */
49 boost::filesystem::create_directory ("DCP");
51 /* Make a picture asset. This is a file which combines JPEG2000 files together to make
52 up the video of the DCP. First, create the object, specifying a frame rate of 24 frames
56 std::shared_ptr<dcp::MonoPictureAsset> picture_asset (new dcp::MonoPictureAsset (dcp::Fraction (24, 1), dcp::SMPTE));
58 /* Start off a write to it */
59 std::shared_ptr<dcp::PictureAssetWriter> picture_writer = picture_asset->start_write ("DCP/picture.mxf", false);
61 /* Write 24 frames of the same JPEG2000 file */
62 dcp::ArrayData picture ("examples/help.j2c");
63 for (int i = 0; i < 24; ++i) {
64 picture_writer->write (picture.data(), picture.size());
68 picture_writer->finalize ();
70 /* Now create a sound MXF. As before, create an object and a writer.
71 When creating the object we specify the sampling rate (48kHz) and the number of channels (2).
73 std::shared_ptr<dcp::SoundAsset> sound_asset (new dcp::SoundAsset(dcp::Fraction(24, 1), 48000, 2, dcp::LanguageTag("en-GB"), dcp::SMPTE));
74 /* Here we must also say which of our channels will have "real" sound data in them */
75 std::vector<dcp::Channel> active_channels;
76 active_channels.push_back (dcp::LEFT);
77 active_channels.push_back (dcp::RIGHT);
78 std::shared_ptr<dcp::SoundAssetWriter> sound_writer = sound_asset->start_write ("DCP/sound.mxf", active_channels);
80 /* Write some sine waves */
82 audio[0] = new float[48000];
83 audio[1] = new float[48000];
84 for (int i = 0; i < 48000; ++i) {
85 audio[0][i] = sin (2 * M_PI * i * 440 / 48000) * 0.25;
86 audio[1][i] = sin (2 * M_PI * i * 880 / 48000) * 0.25;
88 sound_writer->write (audio, 48000);
93 sound_writer->finalize ();
95 /* Now create a reel */
96 std::shared_ptr<dcp::Reel> reel (new dcp::Reel ());
98 /* Add picture and sound to it. The zeros are the `entry points', i.e. the first
99 (video) frame from the assets that the reel should play.
101 reel->add (std::shared_ptr<dcp::ReelPictureAsset> (new dcp::ReelMonoPictureAsset (picture_asset, 0)));
102 reel->add (std::shared_ptr<dcp::ReelSoundAsset> (new dcp::ReelSoundAsset (sound_asset, 0)));
104 /* Make a CPL with this reel */
105 std::shared_ptr<dcp::CPL> cpl (new dcp::CPL ("My film", dcp::FEATURE));
109 dcp::DCP dcp ("DCP");
111 dcp.write_xml (dcp::SMPTE);