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.
20 /** @file src/examine_content_job.cc
21 * @brief A class to run through content at high speed to find its length.
24 #include <boost/filesystem.hpp>
25 #include "examine_content_job.h"
27 #include "decoder_factory.h"
29 #include "transcoder.h"
32 #include "video_decoder.h"
37 using boost::shared_ptr;
39 ExamineContentJob::ExamineContentJob (shared_ptr<Film> f)
45 ExamineContentJob::~ExamineContentJob ()
50 ExamineContentJob::name () const
52 if (_film->name().empty ()) {
53 return "Examine content";
56 return String::compose ("Examine content of %1", _film->name());
60 ExamineContentJob::run ()
63 _film->set_content_digest (md5_digest (_film->content_path ()));
68 /* Set the film's length to either
69 a) a length judged by running through the content or
70 b) the length from a decoder's header.
72 if (!_film->trust_content_header()) {
73 /* Decode the content to get an accurate length */
75 /* We don't want to use any existing length here, as progress
78 _film->unset_length ();
79 _film->set_crop (Crop ());
82 o.decode_audio = false;
84 Decoders decoders = decoder_factory (_film, o);
86 set_progress_unknown ();
87 while (!decoders.video->pass()) {
91 _film->set_length (decoders.video->video_frame());
93 _film->log()->log (String::compose ("Video length examined as %1 frames", _film->length().get()));
97 /* Get a quick decoder to get the content's length from its header */
99 Decoders d = decoder_factory (_film, DecodeOptions());
100 _film->set_length (d.video->length());
102 _film->log()->log (String::compose ("Video length obtained from header as %1 frames", _film->length().get()));
107 set_state (FINISHED_OK);