1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
Copyright (C) 2012-2014 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 "video_decoder.h"
#include "image.h"
#include "content_video.h"
#include "i18n.h"
using std::cout;
using std::list;
using boost::shared_ptr;
using boost::optional;
VideoDecoder::VideoDecoder (shared_ptr<const VideoContent> c)
: _video_content (c)
{
}
shared_ptr<ContentVideo>
VideoDecoder::decoded_video (VideoFrame frame)
{
for (list<shared_ptr<ContentVideo> >::const_iterator i = _decoded_video.begin(); i != _decoded_video.end(); ++i) {
if ((*i)->frame == frame) {
return *i;
}
}
return shared_ptr<ContentVideo> ();
}
shared_ptr<ContentVideo>
VideoDecoder::get_video (VideoFrame frame, bool accurate)
{
if (_decoded_video.empty() || (frame < _decoded_video.front()->frame || frame > (_decoded_video.back()->frame + 1))) {
/* Either we have no decoded data, or what we do have is a long way from what we want: seek */
seek (ContentTime::from_frames (frame, _video_content->video_frame_rate()), accurate);
}
shared_ptr<ContentVideo> dec;
/* Now enough pass() calls will either:
* (a) give us what we want, or
* (b) hit the end of the decoder.
*/
if (accurate) {
/* We are being accurate, so we want the right frame */
while (!decoded_video (frame) && !pass ()) {}
dec = decoded_video (frame);
} else {
/* Any frame will do: use the first one that comes out of pass() */
while (_decoded_video.empty() && !pass ()) {}
if (!_decoded_video.empty ()) {
dec = _decoded_video.front ();
}
}
/* Clean up decoded_video */
while (!_decoded_video.empty() && _decoded_video.front()->frame < (frame - 1)) {
_decoded_video.pop_front ();
}
return dec;
}
/** Called by subclasses when they have a video frame ready */
void
VideoDecoder::video (shared_ptr<const Image> image, VideoFrame frame)
{
switch (_video_content->video_frame_type ()) {
case VIDEO_FRAME_TYPE_2D:
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image, EYES_BOTH, frame)));
break;
case VIDEO_FRAME_TYPE_3D_ALTERNATE:
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image, (frame % 2) ? EYES_RIGHT : EYES_LEFT, frame)));
break;
case VIDEO_FRAME_TYPE_3D_LEFT_RIGHT:
{
int const half = image->size().width / 2;
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image->crop (Crop (0, half, 0, 0), true), EYES_LEFT, frame)));
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image->crop (Crop (half, 0, 0, 0), true), EYES_RIGHT, frame)));
break;
}
case VIDEO_FRAME_TYPE_3D_TOP_BOTTOM:
{
int const half = image->size().height / 2;
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image->crop (Crop (0, 0, 0, half), true), EYES_LEFT, frame)));
_decoded_video.push_back (shared_ptr<ContentVideo> (new ContentVideo (image->crop (Crop (0, 0, half, 0), true), EYES_RIGHT, frame)));
break;
}
default:
assert (false);
}
}
void
VideoDecoder::seek (ContentTime, bool)
{
_decoded_video.clear ();
}
|
