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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 "ratio.h"
#include "i18n.h"
using std::cout;
using boost::shared_ptr;
VideoDecoder::VideoDecoder (shared_ptr<const Film> f, shared_ptr<const VideoContent> c)
: Decoder (f)
, _next_video (0)
, _video_content (c)
, _frame_rate_conversion (c->video_frame_rate(), f->dcp_video_frame_rate())
, _odd (false)
{
}
/** Called by subclasses when some video is ready.
* @param image frame to emit.
* @param same true if this frame is the same as the last one passed to this call.
* @param t Time of the frame within the source.
*/
void
VideoDecoder::video (shared_ptr<Image> image, bool same, Time t)
{
if (_frame_rate_conversion.skip && _odd) {
_odd = !_odd;
return;
}
image->crop (_video_content->crop(), true);
shared_ptr<const Film> film = _film.lock ();
assert (film);
libdcp::Size const container_size = film->container()->size (film->full_frame ());
libdcp::Size const image_size = _video_content->ratio()->size (container_size);
shared_ptr<Image> out = image->scale_and_convert_to_rgb (image_size, film->scaler(), true);
shared_ptr<Subtitle> sub;
if (_timed_subtitle && _timed_subtitle->displayed_at (t)) {
sub = _timed_subtitle->subtitle ();
}
if (sub) {
dcpomatic::Rect const tx = subtitle_transformed_area (
float (image_size.width) / video_size().width,
float (image_size.height) / video_size().height,
sub->area(), film->subtitle_offset(), film->subtitle_scale()
);
shared_ptr<Image> im = sub->image()->scale (tx.size(), film->scaler(), true);
out->alpha_blend (im, tx.position());
}
if (image_size != container_size) {
assert (image_size.width <= container_size.width);
assert (image_size.height <= container_size.height);
shared_ptr<Image> im (new SimpleImage (PIX_FMT_RGB24, container_size, true));
im->make_black ();
im->copy (out, Position ((container_size.width - image_size.width) / 2, (container_size.height - image_size.height) / 2));
out = im;
}
Video (out, same, t);
if (_frame_rate_conversion.repeat) {
Video (image, true, t + film->video_frames_to_time (1));
_next_video = t + film->video_frames_to_time (2);
} else {
_next_video = t + film->video_frames_to_time (1);
}
_odd = !_odd;
}
/** Called by subclasses when a subtitle is ready.
* s may be 0 to say that there is no current subtitle.
* @param s New current subtitle, or 0.
*/
void
VideoDecoder::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 - _video_content->crop().left, p.y - _video_content->crop().top));
}
}
bool
VideoDecoder::video_done () const
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
return (_video_content->length() - _next_video) < film->video_frames_to_time (1);
}
void
VideoDecoder::seek (Time t)
{
_next_video = t;
}
void
VideoDecoder::seek_back ()
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
_next_video -= film->video_frames_to_time (1);
}
void
VideoDecoder::seek_forward ()
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
_next_video += film->video_frames_to_time (1);
}
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