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 /* If you are using an installed libdcp, these #includes would need to be changed to
22 #include <dcp/picture_asset.h>
29 #include "reel_picture_asset.h"
30 #include "mono_picture_frame.h"
31 #include "mono_picture_asset.h"
32 #include "mono_picture_asset_reader.h"
33 #include "stereo_picture_asset.h"
34 #include "sound_asset.h"
35 #include "subtitle_asset.h"
36 #include "openjpeg_image.h"
37 #include "colour_conversion.h"
39 /* This DISABLE/ENABLE pair is just to ignore some warnings from Magick++.h; they
42 LIBDCP_DISABLE_WARNINGS
44 LIBDCP_ENABLE_WARNINGS
45 #include <boost/scoped_array.hpp>
47 /** @file examples/read_dcp.cc
48 * @brief Shows how to read a DCP.
54 /* Unless libdcp has been installed, you need to pass a path containing the "tags" folder here */
55 dcp::init(boost::filesystem::path("."));
56 Magick::InitializeMagick(nullptr);
58 /* Create a DCP, specifying where our existing data is */
59 dcp::DCP dcp ("/home/carl/Test_DCP");
60 /* Read the DCP to find out about it */
63 if (dcp.all_encrypted()) {
64 std::cout << "DCP is encrypted.\n";
65 } else if (dcp.any_encrypted()) {
66 std::cout << "DCP is partially encrypted.\n";
68 std::cout << "DCP is not encrypted.\n";
71 std::cout << "DCP has " << dcp.cpls().size() << " CPLs.\n";
72 auto assets = dcp.assets ();
73 std::cout << "DCP has " << assets.size() << " assets.\n";
74 for (auto i: assets) {
75 if (std::dynamic_pointer_cast<dcp::MonoPictureAsset>(i)) {
76 std::cout << "2D picture\n";
77 } else if (std::dynamic_pointer_cast<dcp::StereoPictureAsset>(i)) {
78 std::cout << "3D picture\n";
79 } else if (std::dynamic_pointer_cast<dcp::SoundAsset>(i)) {
80 std::cout << "Sound\n";
81 } else if (std::dynamic_pointer_cast<dcp::SubtitleAsset>(i)) {
82 std::cout << "Subtitle\n";
83 } else if (std::dynamic_pointer_cast<dcp::CPL>(i)) {
86 std::cout << "\t" << i->file()->leaf().string() << "\n";
89 /* Take the first CPL */
90 auto cpl = dcp.cpls().front();
92 /* Get the picture asset in the first reel */
93 auto picture_asset = std::dynamic_pointer_cast<dcp::MonoPictureAsset>(
94 cpl->reels()[0]->main_picture()->asset()
97 /* Get a reader for it */
98 auto picture_asset_reader = picture_asset->start_read();
100 /* Get the 1000th frame of it */
101 auto picture_frame_j2k = picture_asset_reader->get_frame(999);
103 /* Get the frame as an XYZ image */
104 auto picture_image_xyz = picture_frame_j2k->xyz_image ();
106 /* Convert to ARGB */
107 boost::scoped_array<uint8_t> rgba (new uint8_t[picture_image_xyz->size().width * picture_image_xyz->size().height * 4]);
108 dcp::xyz_to_rgba (picture_image_xyz, dcp::ColourConversion::srgb_to_xyz(), rgba.get(), picture_image_xyz->size().width * 4);
110 Magick::Image image (picture_image_xyz->size().width, picture_image_xyz->size().height, "BGRA", Magick::CharPixel, rgba.get ());
111 image.write ("frame.png");