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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <openjpeg.h>
#include "AS_DCP.h"
#include "KM_fileio.h"
#include "picture_frame.h"
#include "exceptions.h"
#include "argb_frame.h"
#include "lut.h"
using namespace std;
using namespace boost;
using namespace libdcp;
PictureFrame::PictureFrame (string mxf_path, int n)
{
ASDCP::JP2K::MXFReader reader;
if (ASDCP_FAILURE (reader.OpenRead (mxf_path.c_str()))) {
throw FileError ("could not open MXF file for reading", mxf_path);
}
/* XXX: unfortunate guesswork on this buffer size */
_buffer = new ASDCP::JP2K::FrameBuffer (4 * Kumu::Megabyte);
if (ASDCP_FAILURE (reader.ReadFrame (n, *_buffer))) {
throw DCPReadError ("could not read video frame");
}
}
PictureFrame::~PictureFrame ()
{
delete _buffer;
}
uint8_t const *
PictureFrame::data () const
{
return _buffer->RoData();
}
int
PictureFrame::size () const
{
return _buffer->Size ();
}
/** @return An ARGB representation of this frame. This is ARGB in the
* Cairo sense, so that each pixel takes up 4 bytes; the first byte
* is blue, second green, third red and fourth alpha (always 255).
*/
shared_ptr<ARGBFrame>
PictureFrame::argb_frame () const
{
/* JPEG2000 -> decompressed XYZ */
opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
opj_dparameters_t parameters;
opj_set_default_decoder_parameters (¶meters);
opj_setup_decoder (decoder, ¶meters);
opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, const_cast<unsigned char *> (data()), size());
opj_image_t* xyz_frame = opj_decode (decoder, cio);
if (!xyz_frame) {
opj_destroy_decompress (decoder);
opj_cio_close (cio);
throw DCPReadError ("could not decode JPEG2000 codestream");
}
assert (xyz_frame->numcomps == 3);
/* XYZ -> RGB */
struct {
double x, y, z;
} s;
struct {
double r, g, b;
} d;
int* xyz_x = xyz_frame->comps[0].data;
int* xyz_y = xyz_frame->comps[1].data;
int* xyz_z = xyz_frame->comps[2].data;
shared_ptr<ARGBFrame> argb_frame (new ARGBFrame (xyz_frame->x1, xyz_frame->y1));
uint8_t* argb = argb_frame->data ();
for (int y = 0; y < xyz_frame->y1; ++y) {
uint8_t* argb_line = argb;
for (int x = 0; x < xyz_frame->x1; ++x) {
assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_x < 4096 && *xyz_z < 4096);
/* In gamma LUT */
s.x = lut_in[*xyz_x++];
s.y = lut_in[*xyz_y++];
s.z = lut_in[*xyz_z++];
/* DCI companding */
s.x /= DCI_COEFFICIENT;
s.y /= DCI_COEFFICIENT;
s.z /= DCI_COEFFICIENT;
/* XYZ to RGB */
d.r = ((s.x * color_matrix[0][0]) + (s.y * color_matrix[0][1]) + (s.z * color_matrix[0][2]));
d.g = ((s.x * color_matrix[1][0]) + (s.y * color_matrix[1][1]) + (s.z * color_matrix[1][2]));
d.b = ((s.x * color_matrix[2][0]) + (s.y * color_matrix[2][1]) + (s.z * color_matrix[2][2]));
d.r = min (d.r, 1.0);
d.r = max (d.r, 0.0);
d.g = min (d.g, 1.0);
d.g = max (d.g, 0.0);
d.b = min (d.b, 1.0);
d.b = max (d.b, 0.0);
/* Out gamma LUT */
*argb_line++ = lut_out[(int) (d.b * COLOR_DEPTH)];
*argb_line++ = lut_out[(int) (d.g * COLOR_DEPTH)];
*argb_line++ = lut_out[(int) (d.r * COLOR_DEPTH)];
*argb_line++ = 0xff;
}
argb += argb_frame->stride ();
}
opj_cio_close (cio);
opj_image_destroy (xyz_frame);
return argb_frame;
}
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