1 /* This file is part of the Pangolin Project.
2 * http://github.com/stevenlovegrove/Pangolin
3 *
4 * Copyright (c) 2013 Steven Lovegrove
5 *
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use,
10 * copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following
13 * conditions:
14 *
15 * The above copyright notice and this permission notice shall be
16 * included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include <pangolin/video/drivers/truncate.h>
29 #include <pangolin/factory/factory_registry.h>
30 #include <pangolin/video/iostream_operators.h>
31
32 namespace pangolin
33 {
34
TruncateVideo(std::unique_ptr<VideoInterface> & src_,size_t begin,size_t end)35 TruncateVideo::TruncateVideo(std::unique_ptr<VideoInterface> &src_, size_t begin, size_t end)
36 : src(std::move(src_)), streams(src->Streams()), begin(begin), end(end), next_frame_to_grab(0)
37 {
38 videoin.push_back(src.get());
39
40 if(VideoPlaybackInterface* v = GetVideoPlaybackInterface()){
41 // Guard against the obscure case of nested TruncateVideo filters
42 if( !pangolin::FindFirstMatchingVideoInterface<TruncateVideo>(*src_) ) {
43 next_frame_to_grab = v->Seek(begin);
44 }
45 }
46 }
47
~TruncateVideo()48 TruncateVideo::~TruncateVideo()
49 {
50 }
51
SizeBytes() const52 size_t TruncateVideo::SizeBytes() const
53 {
54 return videoin[0]->SizeBytes();
55 }
56
Streams() const57 const std::vector<StreamInfo>& TruncateVideo::Streams() const
58 {
59 return streams;
60 }
61
Start()62 void TruncateVideo::Start()
63 {
64 videoin[0]->Start();
65 }
66
Stop()67 void TruncateVideo::Stop()
68 {
69 videoin[0]->Stop();
70 }
71
GrabNext(unsigned char * image,bool wait)72 bool TruncateVideo::GrabNext( unsigned char* image, bool wait )
73 {
74 if(next_frame_to_grab < end) {
75 bool grab_success = videoin[0]->GrabNext(image, wait);
76 return grab_success && (next_frame_to_grab++) >= begin;
77 }
78 return false;
79 }
80
GrabNewest(unsigned char * image,bool wait)81 bool TruncateVideo::GrabNewest( unsigned char* image, bool wait )
82 {
83 return videoin[0]->GrabNewest(image, wait);
84 }
85
InputStreams()86 std::vector<VideoInterface*>& TruncateVideo::InputStreams()
87 {
88 return videoin;
89 }
90
PANGOLIN_REGISTER_FACTORY(TruncateVideo)91 PANGOLIN_REGISTER_FACTORY(TruncateVideo)
92 {
93 struct TruncateVideoFactory : public FactoryInterface<VideoInterface> {
94 std::unique_ptr<VideoInterface> Open(const Uri& uri) override {
95 std::unique_ptr<VideoInterface> subvid = pangolin::OpenVideo(uri.url);
96 if(subvid->Streams().size() == 0) {
97 throw VideoException("VideoTruncater input must have at least one stream");
98 }
99
100 const size_t start = uri.Get<size_t>("begin", 0);
101 const size_t end = uri.Get<size_t>("end", std::numeric_limits<size_t>::max());
102
103 return std::unique_ptr<VideoInterface>( new TruncateVideo(subvid,start,end) );
104 }
105 };
106
107 FactoryRegistry<VideoInterface>::I().RegisterFactory(std::make_shared<TruncateVideoFactory>(), 10, "truncate");
108 }
109
110 }
111