2 Copyright (C) 2012-2014 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.
20 /** @file src/mono_picture_frame.cc
21 * @brief MonoPictureFrame class.
24 #include "mono_picture_frame.h"
25 #include "exceptions.h"
26 #include "argb_frame.h"
27 #include "gamma_lut.h"
30 #include "KM_fileio.h"
37 using boost::shared_ptr;
40 /** Make a picture frame from a 2D (monoscopic) asset.
41 * @param mxf_path Path to the asset's MXF file.
42 * @param n Frame within the asset, not taking EntryPoint into account.
43 * @param c Context for decryption, or 0.
45 MonoPictureFrame::MonoPictureFrame (boost::filesystem::path mxf_path, int n, ASDCP::AESDecContext* c)
47 ASDCP::JP2K::MXFReader reader;
48 Kumu::Result_t r = reader.OpenRead (mxf_path.string().c_str());
49 if (ASDCP_FAILURE (r)) {
50 boost::throw_exception (FileError ("could not open MXF file for reading", mxf_path, r));
53 /* XXX: unfortunate guesswork on this buffer size */
54 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
56 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer, c))) {
57 boost::throw_exception (DCPReadError ("could not read video frame"));
61 MonoPictureFrame::MonoPictureFrame ()
63 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
66 /** MonoPictureFrame destructor */
67 MonoPictureFrame::~MonoPictureFrame ()
72 /** @return Pointer to JPEG2000 data */
74 MonoPictureFrame::j2k_data () const
76 return _buffer->RoData ();
79 /** @return Pointer to JPEG2000 data */
81 MonoPictureFrame::j2k_data ()
83 return _buffer->Data ();
86 /** @return Size of JPEG2000 data in bytes */
88 MonoPictureFrame::j2k_size () const
90 return _buffer->Size ();
93 /** @param reduce a factor by which to reduce the resolution
94 * of the image, expressed as a power of two (pass 0 for no
96 * @param srgb_gamma Reciprocal of output gamma to use after
97 * the conversion from XYZ to RGB.
99 * @return An ARGB representation of this frame. This is ARGB in the
100 * Cairo sense, so that each pixel takes up 4 bytes; the first byte
101 * is blue, second green, third red and fourth alpha (always 255).
103 shared_ptr<ARGBFrame>
104 MonoPictureFrame::argb_frame (int reduce, float srgb_gamma) const
107 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), reduce),
108 GammaLUT::cache.get (12, DCI_GAMMA, false), GammaLUT::cache.get (12, 1 / srgb_gamma, false)
113 MonoPictureFrame::rgb_frame (uint8_t* buffer) const
116 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), 0),
117 GammaLUT::cache.get (12, DCI_GAMMA, false), GammaLUT::cache.get (12, 1 / 2.4, false),