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 "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 (string mxf_path, int n, ASDCP::AESDecContext* c)
43 ASDCP::JP2K::MXFReader reader;
44 if (ASDCP_FAILURE (reader.OpenRead (mxf_path.c_str()))) {
45 boost::throw_exception (FileError ("could not open MXF file for reading", mxf_path));
48 /* XXX: unfortunate guesswork on this buffer size */
49 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
51 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer, c))) {
52 boost::throw_exception (DCPReadError ("could not read video frame"));
56 MonoPictureFrame::~MonoPictureFrame ()
62 MonoPictureFrame::j2k_data () const
64 return _buffer->RoData ();
68 MonoPictureFrame::j2k_size () const
70 return _buffer->Size ();
73 /** @param reduce a factor by which to reduce the resolution
74 * of the image, expressed as a power of two (pass 0 for no
77 * @return An ARGB representation of this frame. This is ARGB in the
78 * Cairo sense, so that each pixel takes up 4 bytes; the first byte
79 * is blue, second green, third red and fourth alpha (always 255).
83 MonoPictureFrame::argb_frame (int reduce, float srgb_gamma) const
86 decompress_j2k (const_cast<uint8_t*> (_buffer->RoData()), _buffer->Size(), reduce),
87 GammaLUT::cache.get (12, DCI_GAMMA), GammaLUT::cache.get (12, 1 / srgb_gamma)
91 /** Make a picture frame from a 3D (stereoscopic) asset.
92 * @param mxf_path Path to the asset's MXF file.
93 * @param n Frame within the asset, not taking EntryPoint into account.
95 StereoPictureFrame::StereoPictureFrame (string mxf_path, int n)
97 ASDCP::JP2K::MXFSReader reader;
98 if (ASDCP_FAILURE (reader.OpenRead (mxf_path.c_str()))) {
99 boost::throw_exception (FileError ("could not open MXF file for reading", mxf_path));
102 /* XXX: unfortunate guesswork on this buffer size */
103 _buffer = new ASDCP::JP2K::SFrameBuffer (4 * Kumu::Megabyte);
105 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer))) {
106 boost::throw_exception (DCPReadError ("could not read video frame"));
110 StereoPictureFrame::~StereoPictureFrame ()
115 /** @param reduce a factor by which to reduce the resolution
116 * of the image, expressed as a power of two (pass 0 for no
119 * @param eye Eye to return (EYE_LEFT or EYE_RIGHT).
121 * @return An ARGB representation of one of the eyes (left or right)
122 * of this frame. This is ARGB in the Cairo sense, so that each
123 * pixel takes up 4 bytes; the first byte is blue, second green,
124 * third red and fourth alpha (always 255).
127 shared_ptr<ARGBFrame>
128 StereoPictureFrame::argb_frame (Eye eye, int reduce, float srgb_gamma) const
130 shared_ptr<XYZFrame> xyz_frame;
133 xyz_frame = decompress_j2k (const_cast<uint8_t*> (_buffer->Left.RoData()), _buffer->Left.Size(), reduce);
136 xyz_frame = decompress_j2k (const_cast<uint8_t*> (_buffer->Right.RoData()), _buffer->Right.Size(), reduce);
140 return xyz_to_rgb (xyz_frame, GammaLUT::cache.get (12, DCI_GAMMA), GammaLUT::cache.get (12, 1 / srgb_gamma));
144 StereoPictureFrame::left_j2k_data () const
146 return _buffer->Left.RoData ();
150 StereoPictureFrame::left_j2k_size () const
152 return _buffer->Left.Size ();
156 StereoPictureFrame::right_j2k_data () const
158 return _buffer->Right.RoData ();
162 StereoPictureFrame::right_j2k_size () const
164 return _buffer->Right.Size ();