2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "KM_fileio.h"
23 #include "mono_picture_frame.h"
24 #include "exceptions.h"
25 #include "argb_frame.h"
28 #include "gamma_lut.h"
34 using boost::shared_ptr;
35 using namespace libdcp;
37 /** Make a picture frame from a 2D (monoscopic) asset.
38 * @param mxf_path Path to the asset's MXF file.
39 * @param n Frame within the asset, not taking EntryPoint into account.
41 MonoPictureFrame::MonoPictureFrame (boost::filesystem::path mxf_path, int n, ASDCP::AESDecContext* c)
43 ASDCP::JP2K::MXFReader reader;
44 Kumu::Result_t r = reader.OpenRead (mxf_path.string().c_str());
45 if (ASDCP_FAILURE (r)) {
46 boost::throw_exception (FileError ("could not open MXF file for reading", mxf_path, r));
49 /* XXX: unfortunate guesswork on this buffer size */
50 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
52 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer, c))) {
53 boost::throw_exception (DCPReadError ("could not read video frame"));
57 MonoPictureFrame::~MonoPictureFrame ()
63 MonoPictureFrame::j2k_data () const
65 return _buffer->RoData ();
69 MonoPictureFrame::j2k_size () const
71 return _buffer->Size ();
74 /** @param reduce a factor by which to reduce the resolution
75 * of the image, expressed as a power of two (pass 0 for no
78 * @return An ARGB representation of this frame. This is ARGB in the
79 * Cairo sense, so that each pixel takes up 4 bytes; the first byte
80 * is blue, second green, third red and fourth alpha (always 255).
84 MonoPictureFrame::argb_frame (int reduce, float srgb_gamma) const
87 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), reduce),
88 GammaLUT::cache.get (12, DCI_GAMMA), GammaLUT::cache.get (12, 1 / srgb_gamma)