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/decoder.cc
21 * @brief Parent class for decoders of content.
26 #include <boost/lexical_cast.hpp>
31 #include "exceptions.h"
36 #include "delay_line.h"
38 #include "filter_graph.h"
41 using std::stringstream;
45 using boost::shared_ptr;
46 using boost::optional;
50 * @param j Job that we are running within, or 0
51 * @param minimal true to do the bare minimum of work; just run through the content. Useful for acquiring
52 * accurate frame counts as quickly as possible. This generates no video or audio output.
54 Decoder::Decoder (boost::shared_ptr<Film> f, boost::shared_ptr<const Options> o, Job* j)
67 if (_job && !_film->dcp_length()) {
68 _job->set_progress_unknown ();
71 while (pass () == false) {
72 if (_job && _film->dcp_length()) {
73 _job->set_progress (float (_video_frame) / _film->length().get());
78 /** Called to tell the world that some audio data is ready
79 * @param audio Audio data.
82 Decoder::process_audio (shared_ptr<AudioBuffers> audio)
84 /* Maybe apply gain */
85 if (_film->audio_gain() != 0) {
86 float const linear_gain = pow (10, _film->audio_gain() / 20);
87 for (int i = 0; i < audio->channels(); ++i) {
88 for (int j = 0; j < audio->frames(); ++j) {
89 audio->data(i)[j] *= linear_gain;
97 /** Called by subclasses to tell the world that some video data is ready.
98 * We do some post-processing / filtering then emit it for listeners.
99 * @param frame to decode; caller manages memory.
102 Decoder::process_video (AVFrame* frame)
104 shared_ptr<FilterGraph> graph;
106 list<shared_ptr<FilterGraph> >::iterator i = _filter_graphs.begin();
107 while (i != _filter_graphs.end() && !(*i)->can_process (Size (frame->width, frame->height), (AVPixelFormat) frame->format)) {
111 if (i == _filter_graphs.end ()) {
112 graph.reset (new FilterGraph (_film, this, _opt->apply_crop, Size (frame->width, frame->height), (AVPixelFormat) frame->format));
113 _filter_graphs.push_back (graph);
114 _film->log()->log (String::compose ("New graph for %1x%2, pixel format %3", frame->width, frame->height, frame->format));
119 list<shared_ptr<Image> > images = graph->process (frame);
121 for (list<shared_ptr<Image> >::iterator i = images.begin(); i != images.end(); ++i) {
122 shared_ptr<Subtitle> sub;
123 if (_timed_subtitle && _timed_subtitle->displayed_at (double (video_frame()) / _film->frames_per_second())) {
124 sub = _timed_subtitle->subtitle ();
127 emit_video (*i, sub);
132 Decoder::repeat_last_video ()
135 _last_image.reset (new CompactImage (pixel_format(), native_size()));
136 _last_image->make_black ();
139 emit_video (_last_image, _last_subtitle);
143 Decoder::emit_video (shared_ptr<Image> image, shared_ptr<Subtitle> sub)
145 TIMING ("Decoder emits %1", _video_frame);
150 _last_subtitle = sub;
154 Decoder::process_subtitle (shared_ptr<TimedSubtitle> s)
158 if (_timed_subtitle && _opt->apply_crop) {
159 Position const p = _timed_subtitle->subtitle()->position ();
160 _timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
165 Decoder::set_audio_stream (optional<AudioStream> s)
171 Decoder::set_subtitle_stream (optional<SubtitleStream> s)
173 _subtitle_stream = s;