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dash: simplified chunk initialization
[vlc] / modules / stream_filter / dash / adaptationlogic / RateBasedAdaptationLogic.cpp
1 /*
2  * RateBasedAdaptationLogic.cpp
3  *****************************************************************************
4  * Copyright (C) 2010 - 2011 Klagenfurt University
5  *
6  * Created on: Aug 10, 2010
7  * Authors: Christopher Mueller <christopher.mueller@itec.uni-klu.ac.at>
8  *          Christian Timmerer  <christian.timmerer@itec.uni-klu.ac.at>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU Lesser General Public License as published
12  * by the Free Software Foundation; either version 2.1 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23  *****************************************************************************/
24 #ifdef HAVE_CONFIG_H
25 # include "config.h"
26 #endif
27
28 #include "RateBasedAdaptationLogic.h"
29
30 using namespace dash::logic;
31 using namespace dash::xml;
32 using namespace dash::http;
33 using namespace dash::mpd;
34 using namespace dash::exception;
35
36 RateBasedAdaptationLogic::RateBasedAdaptationLogic  (IMPDManager *mpdManager, stream_t *stream) :
37                           AbstractAdaptationLogic   (mpdManager, stream),
38                           mpdManager                (mpdManager),
39                           count                     (0),
40                           currentPeriod             (mpdManager->getFirstPeriod()),
41                           width                     (0),
42                           height                    (0)
43 {
44     this->width  = var_InheritInteger(stream, "dash-prefwidth");
45     this->height = var_InheritInteger(stream, "dash-prefheight");
46 }
47
48 Chunk*  RateBasedAdaptationLogic::getNextChunk() throw(EOFException)
49 {
50     if(this->mpdManager == NULL)
51         throw EOFException();
52
53     if(this->currentPeriod == NULL)
54         throw EOFException();
55
56     long bitrate = this->getBpsAvg();
57
58     Representation *rep = this->mpdManager->getRepresentation(this->currentPeriod, bitrate, this->width, this->height);
59
60     if ( rep == NULL )
61         throw EOFException();
62
63     std::vector<Segment *> segments = this->mpdManager->getSegments(rep);
64
65     if ( this->count == segments.size() )
66     {
67         this->currentPeriod = this->mpdManager->getNextPeriod(this->currentPeriod);
68         this->count = 0;
69         return this->getNextChunk();
70     }
71
72     if ( segments.size() > this->count )
73     {
74         Segment *seg = segments.at( this->count );
75         Chunk *chunk = seg->toChunk();
76         //In case of UrlTemplate, we must stay on the same segment.
77         if ( seg->isSingleShot() == true )
78             this->count++;
79         seg->done();
80         return chunk;
81     }
82     return NULL;
83 }
84
85 const Representation *RateBasedAdaptationLogic::getCurrentRepresentation() const
86 {
87     return this->mpdManager->getRepresentation( this->currentPeriod, this->getBpsAvg() );
88 }