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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
libdcp is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libdcp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libdcp. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file examples/make_dcp.cc
* @brief Shows how to make a DCP from some JPEG2000 and audio data.
*/
#include <vector>
#include <string>
/* If you are using an installed libdcp, these #includes would need to be changed to
#include <dcp/dcp.h>
#include <dcp/cpl.h>
#include <dcp/mono_picture_asset.h>
... etc. ...
*/
#include "dcp.h"
#include "cpl.h"
#include "mono_picture_asset.h"
#include "mono_picture_asset_writer.h"
#include "sound_asset.h"
#include "sound_asset_writer.h"
#include "reel.h"
#include "reel_mono_picture_asset.h"
#include "reel_sound_asset.h"
#include <cmath>
int
main ()
{
/* Create a directory to put the DCP in */
boost::filesystem::create_directory ("DCP");
/* Make a picture asset. This is a file which combines JPEG2000 files together to make
up the video of the DCP. First, create the object, specifying a frame rate of 24 frames
per second.
*/
auto picture_asset = std::make_shared<dcp::MonoPictureAsset>(dcp::Fraction (24, 1), dcp::Standard::SMPTE);
/* Start off a write to it */
auto picture_writer = picture_asset->start_write("DCP/picture.mxf", false);
/* Write 24 frames of the same JPEG2000 file */
dcp::ArrayData picture("examples/help.j2c");
for (int i = 0; i < 24; ++i) {
picture_writer->write (picture.data(), picture.size());
}
/* And finish off */
picture_writer->finalize();
/* Now create a sound MXF. As before, create an object and a writer.
When creating the object we specify the sampling rate (48kHz) and the number of channels (2).
*/
auto sound_asset = std::make_shared<dcp::SoundAsset>(dcp::Fraction(24, 1), 48000, 2, dcp::LanguageTag("en-GB"), dcp::Standard::SMPTE);
/* Here we must also say which of our channels will have "real" sound data in them */
std::vector<dcp::Channel> active_channels;
active_channels.push_back(dcp::Channel::LEFT);
active_channels.push_back(dcp::Channel::RIGHT);
auto sound_writer = sound_asset->start_write("DCP/sound.mxf", active_channels);
/* Write some sine waves */
float* audio[2];
audio[0] = new float[48000];
audio[1] = new float[48000];
for (int i = 0; i < 48000; ++i) {
audio[0][i] = sin (2 * M_PI * i * 440 / 48000) * 0.25;
audio[1][i] = sin (2 * M_PI * i * 880 / 48000) * 0.25;
}
sound_writer->write (audio, 48000);
/* And tidy up */
delete[] audio[0];
delete[] audio[1];
sound_writer->finalize ();
/* Now create a reel */
auto reel = std::make_shared<dcp::Reel>();
/* Add picture and sound to it. The zeros are the `entry points', i.e. the first
(video) frame from the assets that the reel should play.
*/
reel->add (std::make_shared<dcp::ReelMonoPictureAsset>(picture_asset, 0));
reel->add (std::make_shared<dcp::ReelSoundAsset>(sound_asset, 0));
/* Make a CPL with this reel */
auto cpl = std::make_shared<dcp::CPL>("My film", dcp::ContentKind::FEATURE);
cpl->add (reel);
/* Write the DCP */
dcp::DCP dcp ("DCP");
dcp.add (cpl);
dcp.write_xml (dcp::Standard::SMPTE);
return 0;
}
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