src/lib/ab_transcoder.cc

   1 /*
   2     Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  20 #include <iostream>
  21 #include <boost/shared_ptr.hpp>
  22 #include "ab_transcoder.h"
  23 #include "film.h"
  24 #include "encoder.h"
  25 #include "job.h"
  26 #include "options.h"
  27 #include "image.h"
  28 #include "playlist.h"
  29 #include "matcher.h"
  30 #include "delay_line.h"
  31 #include "gain.h"
  32 #include "combiner.h"
  33
  34 /** @file src/ab_transcoder.cc
  35  *  @brief A transcoder which uses one Film for the left half of the screen, and a different one
  36  *  for the right half (to facilitate A/B comparisons of settings)
  37  */
  38
  39 using std::string;
  40 using boost::shared_ptr;
  41 using boost::dynamic_pointer_cast;
  42
  43 /** @param a Film to use for the left half of the screen.
  44  *  @param b Film to use for the right half of the screen.
  45  *  @param o Decoder options.
  46  *  @param j Job that we are associated with.
  47  *  @param e Encoder to use.
  48  */
  49
  50 ABTranscoder::ABTranscoder (shared_ptr<Film> a, shared_ptr<Film> b, DecodeOptions o, shared_ptr<Job> j)
  51         : _film_a (a)
  52         , _film_b (b)
  53         , _playlist_a (_film_a->playlist ())
  54         , _playlist_b (_film_b->playlist ())
  55         , _job (j)
  56         , _encoder (new Encoder (_film_a, _playlist_a))
  57         , _combiner (new Combiner (a->log()))
  58 {
  59         if (_playlist_a->has_audio ()) {
  60                 _matcher.reset (new Matcher (_film_a->log(), _playlist_a->audio_frame_rate(), _playlist_a->video_frame_rate()));
  61                 _delay_line.reset (new DelayLine (_film_a->log(), _playlist_a->audio_channels(), _film_a->audio_delay() * _playlist_a->audio_frame_rate() / 1000));
  62                 _gain.reset (new Gain (_film_a->log(), _film_a->audio_gain()));
  63         }
  64
  65         _playlist_a->Video.connect (bind (&Combiner::process_video, _combiner, _1, _2, _3));
  66         _playlist_b->Video.connect (bind (&Combiner::process_video_b, _combiner, _1, _2, _3));
  67
  68         if (_matcher) {
  69                 _combiner->connect_video (_matcher);
  70                 _matcher->connect_video (_encoder);
  71         } else {
  72                 _combiner->connect_video (_encoder);
  73         }
  74
  75         if (_matcher && _delay_line) {
  76                 _playlist_a->connect_audio (_delay_line);
  77                 _delay_line->connect_audio (_matcher);
  78                 _matcher->connect_audio (_gain);
  79                 _gain->connect_audio (_encoder);
  80         }
  81 }
  82
  83 void
  84 ABTranscoder::go ()
  85 {
  86         _encoder->process_begin ();
  87
  88         bool done[2] = { false, false };
  89
  90         while (1) {
  91                 done[0] = _playlist_a->pass ();
  92                 done[1] = _playlist_b->pass ();
  93
  94                 if (_job) {
  95                         _playlist_a->set_progress (_job);
  96                 }
  97
  98                 if (done[0] && done[1]) {
  99                         break;
 100                 }
 101         }
 102
 103         if (_delay_line) {
 104                 _delay_line->process_end ();
 105         }
 106         if (_matcher) {
 107                 _matcher->process_end ();
 108         }
 109         if (_gain) {
 110                 _gain->process_end ();
 111         }
 112         _encoder->process_end ();
 113 }
 114