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"
29 using namespace boost;
30 using namespace libdcp;
32 PictureFrame::PictureFrame (string mxf_path, int n)
34 ASDCP::JP2K::MXFReader reader;
35 if (ASDCP_FAILURE (reader.OpenRead (mxf_path.c_str()))) {
36 throw FileError ("could not open MXF file for reading", mxf_path);
39 /* XXX: unfortunate guesswork on this buffer size */
40 _buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
42 if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer))) {
43 throw DCPReadError ("could not read video frame");
47 PictureFrame::~PictureFrame ()
53 PictureFrame::data () const
55 return _buffer->RoData();
59 PictureFrame::size () const
61 return _buffer->Size ();
64 /** @return An ARGB representation of this frame. This is ARGB in the
65 * Cairo sense, so that each pixel takes up 4 bytes; the first byte
66 * is blue, second green, third red and fourth alpha (always 255).
69 PictureFrame::argb_frame () const
71 /* JPEG2000 -> decompressed XYZ */
73 opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
74 opj_dparameters_t parameters;
75 opj_set_default_decoder_parameters (¶meters);
76 opj_setup_decoder (decoder, ¶meters);
77 opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, const_cast<unsigned char *> (data()), size());
78 opj_image_t* xyz_frame = opj_decode (decoder, cio);
80 opj_destroy_decompress (decoder);
82 throw DCPReadError ("could not decode JPEG2000 codestream");
85 assert (xyz_frame->numcomps == 3);
97 int* xyz_x = xyz_frame->comps[0].data;
98 int* xyz_y = xyz_frame->comps[1].data;
99 int* xyz_z = xyz_frame->comps[2].data;
101 shared_ptr<ARGBFrame> argb_frame (new ARGBFrame (xyz_frame->x1, xyz_frame->y1));
103 uint8_t* argb = argb_frame->data ();
105 for (int y = 0; y < xyz_frame->y1; ++y) {
106 uint8_t* argb_line = argb;
107 for (int x = 0; x < xyz_frame->x1; ++x) {
109 assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_x < 4096 && *xyz_z < 4096);
112 s.x = lut_in[*xyz_x++];
113 s.y = lut_in[*xyz_y++];
114 s.z = lut_in[*xyz_z++];
117 s.x /= DCI_COEFFICIENT;
118 s.y /= DCI_COEFFICIENT;
119 s.z /= DCI_COEFFICIENT;
122 d.r = ((s.x * color_matrix[0][0]) + (s.y * color_matrix[0][1]) + (s.z * color_matrix[0][2]));
123 d.g = ((s.x * color_matrix[1][0]) + (s.y * color_matrix[1][1]) + (s.z * color_matrix[1][2]));
124 d.b = ((s.x * color_matrix[2][0]) + (s.y * color_matrix[2][1]) + (s.z * color_matrix[2][2]));
126 d.r = min (d.r, 1.0);
127 d.r = max (d.r, 0.0);
129 d.g = min (d.g, 1.0);
130 d.g = max (d.g, 0.0);
132 d.b = min (d.b, 1.0);
133 d.b = max (d.b, 0.0);
136 *argb_line++ = lut_out[(int) (d.b * COLOR_DEPTH)];
137 *argb_line++ = lut_out[(int) (d.g * COLOR_DEPTH)];
138 *argb_line++ = lut_out[(int) (d.r * COLOR_DEPTH)];
142 argb += argb_frame->stride ();
146 opj_image_destroy (xyz_frame);