Basic implementation of extra subtitle-scan job to run when the

subtitle appearance dialogue is opened.  Fixes #1393.

3 files changed, 145 insertions, 0 deletions

diff --git a/src/lib/examine_ffmpeg_subtitles_job.cc b/src/lib/examine_ffmpeg_subtitles_job.cc
new file mode 100644
index 000000000..9197bdcbd
--- /dev/null
+++ b/src/lib/examine_ffmpeg_subtitles_job.cc
@@ -0,0 +1,106 @@
+/*
+    Copyright (C) 2019 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "examine_ffmpeg_subtitles_job.h"
+#include "ffmpeg_content.h"
+#include "ffmpeg_subtitle_stream.h"
+#include "text_content.h"
+#include "cross.h"
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+}
+#include <iostream>
+
+#include "i18n.h"
+
+using std::string;
+using std::cout;
+using boost::shared_ptr;
+
+ExamineFFmpegSubtitlesJob::ExamineFFmpegSubtitlesJob (shared_ptr<const Film> film, shared_ptr<FFmpegContent> c)
+	: Job (film)
+	, FFmpeg (c)
+	, _content (c)
+{
+
+}
+
+string
+ExamineFFmpegSubtitlesJob::name () const
+{
+	return _("Examining subtitles");
+}
+
+string
+ExamineFFmpegSubtitlesJob::json_name () const
+{
+	return N_("examine_subtitles");
+}
+
+void
+ExamineFFmpegSubtitlesJob::run ()
+{
+	dcpomatic_sleep (15);
+
+	int64_t const len = _file_group.length ();
+	while (true) {
+		int r = av_read_frame (_format_context, &_packet);
+		if (r < 0) {
+			break;
+		}
+
+		if (len > 0) {
+			set_progress (float(_format_context->pb->pos) / len);
+		} else {
+			set_progress_unknown ();
+		}
+
+		if (_content->subtitle_stream() && _content->subtitle_stream()->uses_index(_format_context, _packet.stream_index) && _content->only_text()->use()) {
+			int got_subtitle;
+			AVSubtitle sub;
+			if (avcodec_decode_subtitle2(subtitle_codec_context(), &sub, &got_subtitle, &_packet) >= 0 && got_subtitle) {
+				for (unsigned int i = 0; i < sub.num_rects; ++i) {
+					AVSubtitleRect const * rect = sub.rects[i];
+					if (rect->type == SUBTITLE_BITMAP) {
+#ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
+						/* sub_p looks up into a BGRA palette which is here
+						   (i.e. first byte B, second G, third R, fourth A)
+						*/
+						uint32_t const * palette = (uint32_t *) rect->pict.data[1];
+#else
+						/* sub_p looks up into a BGRA palette which is here
+						   (i.e. first byte B, second G, third R, fourth A)
+						*/
+						uint32_t const * palette = (uint32_t *) rect->data[1];
+#endif
+						RGBA c ((palette[i] & 0xff0000) >> 16, (palette[i] & 0xff00) >> 8, palette[i] & 0xff, (palette[i] & 0xff000000) >> 24);
+						_content->subtitle_stream()->set_colour (c, c);
+					}
+				}
+			}
+		}
+
+		av_packet_unref (&_packet);
+	}
+
+	set_progress (1);
+	set_state (FINISHED_OK);
+}
diff --git a/src/lib/examine_ffmpeg_subtitles_job.h b/src/lib/examine_ffmpeg_subtitles_job.h
new file mode 100644
index 000000000..5960a9cc3
--- /dev/null
+++ b/src/lib/examine_ffmpeg_subtitles_job.h
@@ -0,0 +1,38 @@
+/*
+    Copyright (C) 2019 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "job.h"
+#include "ffmpeg.h"
+#include <boost/shared_ptr.hpp>
+
+class FFmpegContent;
+
+class ExamineFFmpegSubtitlesJob : public Job, public FFmpeg
+{
+public:
+	ExamineFFmpegSubtitlesJob (boost::shared_ptr<const Film>, boost::shared_ptr<FFmpegContent>);
+
+	std::string name () const;
+	std::string json_name () const;
+	void run ();
+
+private:
+	boost::shared_ptr<FFmpegContent> _content;
+};
diff --git a/src/lib/wscript b/src/lib/wscript
index 9e20131a8..9bd07c67d 100644
--- a/src/lib/wscript
+++ b/src/lib/wscript
@@ -85,6 +85,7 @@ sources = """
           environment_info.cc
           event_history.cc
           examine_content_job.cc
+          examine_ffmpeg_subtitles_job.cc
           exceptions.cc
           file_group.cc
           file_log.cc