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 "video_decoder.h"
  25 #include "audio_decoder.h"
  26 #include "encoder.h"
  27 #include "job.h"
  28 #include "options.h"
  29 #include "image.h"
  30 #include "decoder_factory.h"
  31 #include "matcher.h"
  32 #include "delay_line.h"
  33 #include "gain.h"
  34 #include "combiner.h"
  35
  36 /** @file src/ab_transcoder.cc
  37  *  @brief A transcoder which uses one Film for the left half of the screen, and a different one
  38  *  for the right half (to facilitate A/B comparisons of settings)
  39  */
  40
  41 using std::string;
  42 using boost::shared_ptr;
  43 using boost::dynamic_pointer_cast;
  44
  45 /** @param a Film to use for the left half of the screen.
  46  *  @param b Film to use for the right half of the screen.
  47  *  @param o Decoder options.
  48  *  @param j Job that we are associated with.
  49  *  @param e Encoder to use.
  50  */
  51
  52 ABTranscoder::ABTranscoder (
  53         shared_ptr<Film> a, shared_ptr<Film> b, DecodeOptions o, Job* j, shared_ptr<Encoder> e)
  54         : _film_a (a)
  55         , _film_b (b)
  56         , _job (j)
  57         , _encoder (e)
  58         , _combiner (new Combiner (a->log()))
  59 {
  60         _da = decoder_factory (_film_a, o);
  61         _db = decoder_factory (_film_b, o);
  62
  63         if (_film_a->audio_stream()) {
  64                 shared_ptr<AudioStream> st = _film_a->audio_stream();
  65                 _matcher.reset (new Matcher (_film_a->log(), st->sample_rate(), _film_a->source_frame_rate()));
  66                 _delay_line.reset (new DelayLine (_film_a->log(), st->channels(), _film_a->audio_delay() * st->sample_rate() / 1000));
  67                 _gain.reset (new Gain (_film_a->log(), _film_a->audio_gain()));
  68         }
  69
  70         /* Set up the decoder to use the film's set streams */
  71         _da.video->set_subtitle_stream (_film_a->subtitle_stream ());
  72         _db.video->set_subtitle_stream (_film_a->subtitle_stream ());
  73         _da.audio->set_audio_stream (_film_a->audio_stream ());
  74
  75         _da.video->Video.connect (bind (&Combiner::process_video, _combiner, _1, _2, _3));
  76         _db.video->Video.connect (bind (&Combiner::process_video_b, _combiner, _1, _2, _3));
  77
  78         if (_matcher) {
  79                 _combiner->connect_video (_matcher);
  80                 _matcher->connect_video (_encoder);
  81         } else {
  82                 _combiner->connect_video (_encoder);
  83         }
  84
  85         if (_matcher && _delay_line) {
  86                 _da.audio->connect_audio (_delay_line);
  87                 _delay_line->connect_audio (_matcher);
  88                 _matcher->connect_audio (_gain);
  89                 _gain->connect_audio (_encoder);
  90         }
  91 }
  92
  93 void
  94 ABTranscoder::go ()
  95 {
  96         _encoder->process_begin ();
  97
  98         bool done[3] = { false, false, false };
  99
 100         while (1) {
 101                 done[0] = _da.video->pass ();
 102                 done[1] = _db.video->pass ();
 103
 104                 if (!done[2] && _da.audio && dynamic_pointer_cast<Decoder> (_da.audio) != dynamic_pointer_cast<Decoder> (_da.video)) {
 105                         done[2] = _da.audio->pass ();
 106                 } else {
 107                         done[2] = true;
 108                 }
 109
 110                 if (_job) {
 111                         _da.video->set_progress (_job);
 112                 }
 113
 114                 if (done[0] && done[1] && done[2]) {
 115                         break;
 116                 }
 117         }
 118
 119         if (_delay_line) {
 120                 _delay_line->process_end ();
 121         }
 122         if (_matcher) {
 123                 _matcher->process_end ();
 124         }
 125         if (_gain) {
 126                 _gain->process_end ();
 127         }
 128         _encoder->process_end ();
 129 }
 130