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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "video_decoder.h"
#include "subtitle.h"
#include "film.h"
#include "image.h"
#include "log.h"
#include "options.h"
#include "job.h"
#include "i18n.h"
using boost::shared_ptr;
using boost::optional;
VideoDecoder::VideoDecoder (shared_ptr<Film> f, DecodeOptions o)
: Decoder (f, o)
, _video_frame (0)
, _last_source_time (0)
{
}
/** Called by subclasses to tell the world that some video data is ready.
* We find a subtitle then emit it for listeners.
* @param image frame to emit.
* @param t Time of the frame within the source, in seconds.
*/
void
VideoDecoder::emit_video (shared_ptr<Image> image, double t)
{
shared_ptr<Subtitle> sub;
if (_timed_subtitle && _timed_subtitle->displayed_at (t)) {
sub = _timed_subtitle->subtitle ();
}
signal_video (image, false, sub);
_last_source_time = t;
}
/** Called by subclasses to repeat the last video frame that we
* passed to emit_video(). If emit_video hasn't yet been called,
* we will generate a black frame.
*/
void
VideoDecoder::repeat_last_video ()
{
if (!_last_image) {
_last_image.reset (new SimpleImage (pixel_format(), native_size(), true));
_last_image->make_black ();
}
signal_video (_last_image, true, _last_subtitle);
}
/** Emit our signal to say that some video data is ready.
* @param image Video frame.
* @param same true if `image' is the same as the last one we emitted.
* @param sub Subtitle for this frame, or 0.
*/
void
VideoDecoder::signal_video (shared_ptr<Image> image, bool same, shared_ptr<Subtitle> sub)
{
TIMING (N_("Decoder emits %1"), _video_frame);
Video (image, same, sub);
++_video_frame;
_last_image = image;
_last_subtitle = sub;
}
/** Set up the current subtitle. This will be put onto frames that
* fit within its time specification. s may be 0 to say that there
* is no current subtitle.
* @param s New current subtitle, or 0.
*/
void
VideoDecoder::emit_subtitle (shared_ptr<TimedSubtitle> s)
{
_timed_subtitle = s;
if (_timed_subtitle) {
Position const p = _timed_subtitle->subtitle()->position ();
_timed_subtitle->subtitle()->set_position (Position (p.x - _film->crop().left, p.y - _film->crop().top));
}
}
/** Set which stream of subtitles we should use from our source.
* @param s Stream to use.
*/
void
VideoDecoder::set_subtitle_stream (shared_ptr<SubtitleStream> s)
{
_subtitle_stream = s;
}
void
VideoDecoder::set_progress (Job* j) const
{
assert (j);
if (_film->length()) {
j->set_progress (float (_video_frame) / _film->length().get());
}
}
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