src/lib/examine_ffmpeg_subtitles_job.cc

   1 /*
   2     Copyright (C) 2019 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "examine_ffmpeg_subtitles_job.h"
  22 #include "ffmpeg_content.h"
  23 #include "ffmpeg_subtitle_stream.h"
  24 #include "text_content.h"
  25 #include "cross.h"
  26 extern "C" {
  27 #include <libavcodec/avcodec.h>
  28 #include <libavformat/avformat.h>
  29 }
  30 #include <iostream>
  31
  32 #include "i18n.h"
  33
  34 using std::string;
  35 using std::cout;
  36 using boost::shared_ptr;
  37
  38 ExamineFFmpegSubtitlesJob::ExamineFFmpegSubtitlesJob (shared_ptr<const Film> film, shared_ptr<FFmpegContent> c)
  39         : Job (film)
  40         , FFmpeg (c)
  41         , _content (c)
  42 {
  43
  44 }
  45
  46 string
  47 ExamineFFmpegSubtitlesJob::name () const
  48 {
  49         return _("Examining subtitles");
  50 }
  51
  52 string
  53 ExamineFFmpegSubtitlesJob::json_name () const
  54 {
  55         return N_("examine_subtitles");
  56 }
  57
  58 void
  59 ExamineFFmpegSubtitlesJob::run ()
  60 {
  61         int64_t const len = _file_group.length ();
  62         while (true) {
  63                 int r = av_read_frame (_format_context, &_packet);
  64                 if (r < 0) {
  65                         break;
  66                 }
  67
  68                 if (len > 0) {
  69                         set_progress (float(_format_context->pb->pos) / len);
  70                 } else {
  71                         set_progress_unknown ();
  72                 }
  73
  74                 if (_content->subtitle_stream() && _content->subtitle_stream()->uses_index(_format_context, _packet.stream_index) && _content->only_text()->use()) {
  75                         int got_subtitle;
  76                         AVSubtitle sub;
  77                         if (avcodec_decode_subtitle2(subtitle_codec_context(), &sub, &got_subtitle, &_packet) >= 0 && got_subtitle) {
  78                                 for (unsigned int i = 0; i < sub.num_rects; ++i) {
  79                                         AVSubtitleRect const * rect = sub.rects[i];
  80                                         if (rect->type == SUBTITLE_BITMAP) {
  81 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
  82                                                 /* sub_p looks up into a BGRA palette which is here
  83                                                    (i.e. first byte B, second G, third R, fourth A)
  84                                                 */
  85                                                 uint32_t const * palette = (uint32_t *) rect->pict.data[1];
  86 #else
  87                                                 /* sub_p looks up into a BGRA palette which is here
  88                                                    (i.e. first byte B, second G, third R, fourth A)
  89                                                 */
  90                                                 uint32_t const * palette = (uint32_t *) rect->data[1];
  91 #endif
  92                                                 for (int j = 0; j < rect->nb_colors; ++j) {
  93                                                         RGBA c ((palette[j] & 0xff0000) >> 16, (palette[j] & 0xff00) >> 8, palette[j] & 0xff, (palette[j] & 0xff000000) >> 24);
  94                                                         _content->subtitle_stream()->set_colour (c, c);
  95                                                 }
  96                                         }
  97                                 }
  98                         }
  99                 }
 100
 101                 av_packet_unref (&_packet);
 102         }
 103
 104         set_progress (1);
 105         set_state (FINISHED_OK);
 106 }