/*
- Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2014 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
*/
-/** @file src/subtitle.cc
- * @brief Representations of subtitles.
- */
-
#include "subtitle.h"
+#include "subtitle_content.h"
+#include "piece.h"
#include "image.h"
-#include "exceptions.h"
-
-using namespace std;
-using namespace boost;
-
-/** Construct a TimedSubtitle. This is a subtitle image, position,
- * and a range of time over which it should be shown.
- * @param sub AVSubtitle to read.
- */
-TimedSubtitle::TimedSubtitle (AVSubtitle const & sub)
+#include "scaler.h"
+#include "film.h"
+
+using boost::shared_ptr;
+using boost::dynamic_pointer_cast;
+using boost::weak_ptr;
+
+Subtitle::Subtitle (shared_ptr<const Film> film, libdcp::Size video_container_size, weak_ptr<Piece> weak_piece, shared_ptr<Image> image, dcpomatic::Rect<double> rect, Time from, Time to)
+ : _piece (weak_piece)
+ , _in_image (image)
+ , _in_rect (rect)
+ , _in_from (from)
+ , _in_to (to)
{
- assert (sub.num_rects > 0);
-
- /* Subtitle PTS in seconds (within the source, not taking into account any of the
- source that we may have chopped off for the DCP)
- */
- double const packet_time = static_cast<double> (sub.pts) / AV_TIME_BASE;
-
- /* hence start time for this sub */
- _from = packet_time + (double (sub.start_display_time) / 1e3);
- _to = packet_time + (double (sub.end_display_time) / 1e3);
+ update (film, video_container_size);
+}
- if (sub.num_rects > 1) {
- throw DecodeError ("multi-part subtitles not yet supported");
+void
+Subtitle::update (shared_ptr<const Film> film, libdcp::Size video_container_size)
+{
+ shared_ptr<Piece> piece = _piece.lock ();
+ if (!piece) {
+ return;
}
- AVSubtitleRect const * rect = sub.rects[0];
-
- if (rect->type != SUBTITLE_BITMAP) {
- throw DecodeError ("non-bitmap subtitles not yet supported");
- }
-
- shared_ptr<Image> image (new SimpleImage (PIX_FMT_RGBA, libdcp::Size (rect->w, rect->h), true));
-
- /* Start of the first line in the subtitle */
- uint8_t* sub_p = rect->pict.data[0];
- /* sub_p looks up into a RGB palette which is here */
- uint32_t const * palette = (uint32_t *) rect->pict.data[1];
- /* Start of the output data */
- uint32_t* out_p = (uint32_t *) image->data()[0];
-
- for (int y = 0; y < rect->h; ++y) {
- uint8_t* sub_line_p = sub_p;
- uint32_t* out_line_p = out_p;
- for (int x = 0; x < rect->w; ++x) {
- *out_line_p++ = palette[*sub_line_p++];
- }
- sub_p += rect->pict.linesize[0];
- out_p += image->stride()[0] / sizeof (uint32_t);
+ if (!_in_image) {
+ _out_image.reset ();
+ return;
}
- _subtitle.reset (new Subtitle (Position (rect->x, rect->y), image));
-}
-
-/** @param t Time in seconds from the start of the source */
-bool
-TimedSubtitle::displayed_at (double t) const
-{
- return t >= _from && t <= _to;
-}
-
-/** Construct a subtitle, which is an image and a position.
- * @param p Position within the (uncropped) source frame.
- * @param i Image of the subtitle (should be RGBA).
- */
-Subtitle::Subtitle (Position p, shared_ptr<Image> i)
- : _position (p)
- , _image (i)
-{
+ shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (piece->content);
+ assert (sc);
-}
+ dcpomatic::Rect<double> in_rect = _in_rect;
+ libdcp::Size scaled_size;
-/** Given the area of a subtitle, work out the area it should
- * take up when its video frame is scaled up, and it is optionally
- * itself scaled and offset.
- * @param target_x_scale the x scaling of the video frame that the subtitle is in.
- * @param target_y_scale the y scaling of the video frame that the subtitle is in.
- * @param sub_area The area of the subtitle within the original source.
- * @param subtitle_offset y offset to apply to the subtitle position (+ve is down)
- * in the coordinate space of the source.
- * @param subtitle_scale scaling factor to apply to the subtitle image.
- */
-Rect
-subtitle_transformed_area (
- float target_x_scale, float target_y_scale,
- Rect sub_area, int subtitle_offset, float subtitle_scale
- )
-{
- Rect tx;
-
- sub_area.y += subtitle_offset;
+ in_rect.x += sc->subtitle_x_offset ();
+ in_rect.y += sc->subtitle_y_offset ();
- /* We will scale the subtitle by the same amount as the video frame, and also by the additional
- subtitle_scale
- */
- tx.width = sub_area.width * target_x_scale * subtitle_scale;
- tx.height = sub_area.height * target_y_scale * subtitle_scale;
+ /* We will scale the subtitle up to fit _video_container_size, and also by the additional subtitle_scale */
+ scaled_size.width = in_rect.width * video_container_size.width * sc->subtitle_scale ();
+ scaled_size.height = in_rect.height * video_container_size.height * sc->subtitle_scale ();
/* Then we need a corrective translation, consisting of two parts:
*
- * 1. that which is the result of the scaling of the subtitle by target_x_scale and target_y_scale; this will be
- * sub_area.x * target_x_scale and sub_area.y * target_y_scale.
+ * 1. that which is the result of the scaling of the subtitle by _video_container_size; this will be
+ * rect.x * _video_container_size.width and rect.y * _video_container_size.height.
*
* 2. that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
* (width_before_subtitle_scale * (1 - subtitle_scale) / 2) and
* Combining these two translations gives these expressions.
*/
- tx.x = target_x_scale * (sub_area.x + (sub_area.width * (1 - subtitle_scale) / 2));
- tx.y = target_y_scale * (sub_area.y + (sub_area.height * (1 - subtitle_scale) / 2));
+ _out_position.x = rint (video_container_size.width * (in_rect.x + (in_rect.width * (1 - sc->subtitle_scale ()) / 2)));
+ _out_position.y = rint (video_container_size.height * (in_rect.y + (in_rect.height * (1 - sc->subtitle_scale ()) / 2)));
+
+ _out_image = _in_image->scale (
+ scaled_size,
+ Scaler::from_id ("bicubic"),
+ _in_image->pixel_format (),
+ true
+ );
+
+ /* XXX: hack */
+ Time from = _in_from;
+ Time to = _in_to;
+ shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (piece->content);
+ if (vc) {
+ from = rint (from * vc->video_frame_rate() / film->video_frame_rate());
+ to = rint (to * vc->video_frame_rate() / film->video_frame_rate());
+ }
+
+ _out_from = from + piece->content->position ();
+ _out_to = to + piece->content->position ();
- return tx;
+ check_out_to ();
}
-/** @return area that this subtitle takes up, in the original uncropped source's coordinate space */
-Rect
-Subtitle::area () const
+bool
+Subtitle::covers (Time t) const
{
- return Rect (_position.x, _position.y, _image->size().width, _image->size().height);
+ return _out_from <= t && t <= _out_to;
+}
+
+void
+Subtitle::check_out_to ()
+{
+ if (_stop && _out_to > _stop.get ()) {
+ _out_to = _stop.get ();
+ }
}
projects / dcpomatic.git / blobdiff