*/
+/** @file src/subtitle.cc
+ * @brief Representations of subtitles.
+ */
+
#include "subtitle.h"
#include "image.h"
#include "exceptions.h"
-#include "film_state.h"
+
+#include "i18n.h"
using namespace std;
using namespace boost;
+using libdcp::Size;
+/** 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)
{
- /* subtitle PTS in seconds */
- float const packet_time = (sub.pts / AV_TIME_BASE) + float (sub.pts % AV_TIME_BASE) / 1e6;
+ 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);
if (sub.num_rects > 1) {
- throw DecodeError ("multi-part subtitles not yet supported");
+ throw DecodeError (_("multi-part subtitles not yet supported"));
}
AVSubtitleRect const * rect = sub.rects[0];
if (rect->type != SUBTITLE_BITMAP) {
- throw DecodeError ("non-bitmap subtitles not yet supported");
+ throw DecodeError (_("non-bitmap subtitles not yet supported"));
}
- shared_ptr<Image> image (new AlignedImage (PIX_FMT_RGBA, Size (rect->w, rect->h)));
+ 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];
_subtitle.reset (new Subtitle (Position (rect->x, rect->y), image));
}
-/** @param t Time in seconds from the start of the film */
+/** @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)
{
}
-
-Rectangle
+
+/** 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,
- Rectangle sub_area, int subtitle_offset, float subtitle_scale
+ Rect sub_area, int subtitle_offset, float subtitle_scale
)
{
- Rectangle tx;
+ Rect tx;
sub_area.y += subtitle_offset;
* 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));
+ tx.x = rint (target_x_scale * (sub_area.x + (sub_area.width * (1 - subtitle_scale) / 2)));
+ tx.y = rint (target_y_scale * (sub_area.y + (sub_area.height * (1 - subtitle_scale) / 2)));
return tx;
}
-Rectangle
+/** @return area that this subtitle takes up, in the original uncropped source's coordinate space */
+Rect
Subtitle::area () const
{
- return Rectangle (_position.x, _position.y, _image->size().width, _image->size().height);
+ return Rect (_position.x, _position.y, _image->size().width, _image->size().height);
}