Fix some spelling mistakes (mostly in comments).
[dcpomatic.git] / src / lib / reel_writer.cc
index e12628c74ad24ac6f6596b035150591fa1bfc289..a247349d5a08c0f75e89dfcff5ec7ed05e5a3341 100644 (file)
 
 */
 
-#include "reel_writer.h"
-#include "film.h"
+
+#include "audio_buffers.h"
+#include "compose.hpp"
+#include "config.h"
 #include "cross.h"
-#include "job.h"
-#include "log.h"
 #include "dcpomatic_log.h"
 #include "digester.h"
-#include "font.h"
-#include "compose.hpp"
-#include "config.h"
-#include "audio_buffers.h"
+#include "film.h"
 #include "image.h"
+#include "image_png.h"
+#include "job.h"
+#include "log.h"
+#include "reel_writer.h"
 #include <dcp/atmos_asset.h>
 #include <dcp/atmos_asset_writer.h>
+#include <dcp/certificate_chain.h>
+#include <dcp/cpl.h>
+#include <dcp/dcp.h>
+#include <dcp/interop_subtitle_asset.h>
 #include <dcp/mono_picture_asset.h>
-#include <dcp/stereo_picture_asset.h>
-#include <dcp/sound_asset.h>
-#include <dcp/sound_asset_writer.h>
+#include <dcp/raw_convert.h>
 #include <dcp/reel.h>
 #include <dcp/reel_atmos_asset.h>
+#include <dcp/reel_interop_closed_caption_asset.h>
+#include <dcp/reel_interop_subtitle_asset.h>
+#include <dcp/reel_markers_asset.h>
 #include <dcp/reel_mono_picture_asset.h>
-#include <dcp/reel_stereo_picture_asset.h>
+#include <dcp/reel_smpte_closed_caption_asset.h>
+#include <dcp/reel_smpte_subtitle_asset.h>
 #include <dcp/reel_sound_asset.h>
-#include <dcp/reel_subtitle_asset.h>
-#include <dcp/reel_closed_caption_asset.h>
-#include <dcp/reel_markers_asset.h>
-#include <dcp/dcp.h>
-#include <dcp/cpl.h>
-#include <dcp/certificate_chain.h>
-#include <dcp/interop_subtitle_asset.h>
+#include <dcp/reel_stereo_picture_asset.h>
 #include <dcp/smpte_subtitle_asset.h>
-#include <dcp/raw_convert.h>
+#include <dcp/sound_asset.h>
+#include <dcp/sound_asset_writer.h>
+#include <dcp/stereo_picture_asset.h>
 #include <dcp/subtitle_image.h>
-#include <boost/foreach.hpp>
 
 #include "i18n.h"
 
-using std::list;
-using std::string;
-using std::cout;
+
+using std::dynamic_pointer_cast;
 using std::exception;
+using std::list;
+using std::make_shared;
 using std::map;
+using std::set;
+using std::shared_ptr;
+using std::string;
 using std::vector;
-using boost::shared_ptr;
+using std::weak_ptr;
 using boost::optional;
-using boost::dynamic_pointer_cast;
 #if BOOST_VERSION >= 106100
 using namespace boost::placeholders;
 #endif
-using boost::weak_ptr;
 using dcp::ArrayData;
 using dcp::Data;
 using dcp::raw_convert;
 using namespace dcpomatic;
 
+
 int const ReelWriter::_info_size = 48;
 
+
 static dcp::MXFMetadata
 mxf_metadata ()
 {
        dcp::MXFMetadata meta;
-       Config* config = Config::instance();
+       auto config = Config::instance();
        if (!config->dcp_company_name().empty()) {
                meta.company_name = config->dcp_company_name ();
        }
@@ -92,9 +98,14 @@ mxf_metadata ()
        return meta;
 }
 
-/** @param job Related job, or 0 */
+
+/** @param job Related job, or 0.
+ *  @param text_only true to enable a special mode where the writer will expect only subtitles and closed captions to be written
+ *  (no picture nor sound) and not give errors in that case.  This is used by the hints system to check the potential sizes of
+ *  subtitle / closed caption files.
+ */
 ReelWriter::ReelWriter (
-       weak_ptr<const Film> weak_film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count
+       weak_ptr<const Film> weak_film, DCPTimePeriod period, shared_ptr<Job> job, int reel_index, int reel_count, bool text_only
        )
        : WeakConstFilm (weak_film)
        , _period (period)
@@ -102,20 +113,21 @@ ReelWriter::ReelWriter (
        , _reel_count (reel_count)
        , _content_summary (film()->content_summary(period))
        , _job (job)
+       , _text_only (text_only)
 {
        /* Create or find our picture asset in a subdirectory, named
           according to those film's parameters which affect the video
           output.  We will hard-link it into the DCP later.
        */
 
-       dcp::Standard const standard = film()->interop() ? dcp::INTEROP : dcp::SMPTE;
+       auto const standard = film()->interop() ? dcp::Standard::INTEROP : dcp::Standard::SMPTE;
 
        boost::filesystem::path const asset =
                film()->internal_video_asset_dir() / film()->internal_video_asset_filename(_period);
 
-       _first_nonexistant_frame = check_existing_picture_asset (asset);
+       _first_nonexistent_frame = check_existing_picture_asset (asset);
 
-       if (_first_nonexistant_frame < period.duration().frames_round(film()->video_frame_rate())) {
+       if (_first_nonexistent_frame < period.duration().frames_round(film()->video_frame_rate())) {
                /* We do not have a complete picture asset.  If there is an
                   existing asset, break any hard links to it as we are about
                   to change its contents (if only by changing the IDs); see
@@ -148,20 +160,25 @@ ReelWriter::ReelWriter (
                }
 
                _picture_asset->set_file (asset);
-               _picture_asset_writer = _picture_asset->start_write (asset, _first_nonexistant_frame > 0);
-       } else {
+               _picture_asset_writer = _picture_asset->start_write (asset, _first_nonexistent_frame > 0);
+       } else if (!text_only) {
                /* We already have a complete picture asset that we can just re-use */
                /* XXX: what about if the encryption key changes? */
                if (film()->three_d()) {
-                       _picture_asset.reset (new dcp::StereoPictureAsset(asset));
+                       _picture_asset = make_shared<dcp::StereoPictureAsset>(asset);
                } else {
-                       _picture_asset.reset (new dcp::MonoPictureAsset(asset));
+                       _picture_asset = make_shared<dcp::MonoPictureAsset>(asset);
                }
        }
 
        if (film()->audio_channels()) {
-               _sound_asset.reset (
-                       new dcp::SoundAsset (dcp::Fraction(film()->video_frame_rate(), 1), film()->audio_frame_rate(), film()->audio_channels(), film()->audio_language(), standard)
+               auto lang = film()->audio_language();
+               _sound_asset = make_shared<dcp::SoundAsset> (
+                       dcp::Fraction(film()->video_frame_rate(), 1),
+                       film()->audio_frame_rate(),
+                       film()->audio_channels(),
+                       lang ? *lang : dcp::LanguageTag("en-US"),
+                       standard
                        );
 
                _sound_asset->set_metadata (mxf_metadata());
@@ -172,58 +189,57 @@ ReelWriter::ReelWriter (
 
                DCPOMATIC_ASSERT (film()->directory());
 
-               vector<dcp::Channel> active;
-               BOOST_FOREACH (int i, film()->mapped_audio_channels()) {
-                       active.push_back (static_cast<dcp::Channel>(i));
-               }
-
                /* Write the sound asset into the film directory so that we leave the creation
                   of the DCP directory until the last minute.
                */
                _sound_asset_writer = _sound_asset->start_write (
                        film()->directory().get() / audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary),
-                       active,
                        film()->contains_atmos_content()
                        );
        }
+
+       _default_font = dcp::ArrayData(default_font_file());
 }
 
+
 /** @param frame reel-relative frame */
 void
 ReelWriter::write_frame_info (Frame frame, Eyes eyes, dcp::FrameInfo info) const
 {
-       shared_ptr<InfoFileHandle> handle = film()->info_file_handle(_period, false);
-       dcpomatic_fseek (handle->get(), frame_info_position(frame, eyes), SEEK_SET);
-       checked_fwrite (&info.offset, sizeof(info.offset), handle->get(), handle->file());
-       checked_fwrite (&info.size, sizeof (info.size), handle->get(), handle->file());
-       checked_fwrite (info.hash.c_str(), info.hash.size(), handle->get(), handle->file());
+       auto handle = film()->info_file_handle(_period, false);
+       handle->get().seek(frame_info_position(frame, eyes), SEEK_SET);
+       handle->get().checked_write(&info.offset, sizeof(info.offset));
+       handle->get().checked_write(&info.size, sizeof(info.size));
+       handle->get().checked_write(info.hash.c_str(), info.hash.size());
 }
 
+
 dcp::FrameInfo
 ReelWriter::read_frame_info (shared_ptr<InfoFileHandle> info, Frame frame, Eyes eyes) const
 {
        dcp::FrameInfo frame_info;
-       dcpomatic_fseek (info->get(), frame_info_position(frame, eyes), SEEK_SET);
-       checked_fread (&frame_info.offset, sizeof(frame_info.offset), info->get(), info->file());
-       checked_fread (&frame_info.size, sizeof(frame_info.size), info->get(), info->file());
+       info->get().seek(frame_info_position(frame, eyes), SEEK_SET);
+       info->get().checked_read(&frame_info.offset, sizeof(frame_info.offset));
+       info->get().checked_read(&frame_info.size, sizeof(frame_info.size));
 
        char hash_buffer[33];
-       checked_fread (hash_buffer, 32, info->get(), info->file());
+       info->get().checked_read(hash_buffer, 32);
        hash_buffer[32] = '\0';
        frame_info.hash = hash_buffer;
 
        return frame_info;
 }
 
+
 long
 ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
 {
        switch (eyes) {
-       case EYES_BOTH:
+       case Eyes::BOTH:
                return frame * _info_size;
-       case EYES_LEFT:
+       case Eyes::LEFT:
                return frame * _info_size * 2;
-       case EYES_RIGHT:
+       case Eyes::RIGHT:
                return frame * _info_size * 2 + _info_size;
        default:
                DCPOMATIC_ASSERT (false);
@@ -232,17 +248,18 @@ ReelWriter::frame_info_position (Frame frame, Eyes eyes) const
        DCPOMATIC_ASSERT (false);
 }
 
+
 Frame
 ReelWriter::check_existing_picture_asset (boost::filesystem::path asset)
 {
-       shared_ptr<Job> job = _job.lock ();
+       auto job = _job.lock ();
 
        if (job) {
                job->sub (_("Checking existing image data"));
        }
 
        /* Try to open the existing asset */
-       FILE* asset_file = fopen_boost (asset, "rb");
+       dcp::File asset_file(asset, "rb");
        if (!asset_file) {
                LOG_GENERAL ("Could not open existing asset at %1 (errno=%2)", asset.string(), errno);
                return 0;
@@ -256,40 +273,38 @@ ReelWriter::check_existing_picture_asset (boost::filesystem::path asset)
                info_file = film()->info_file_handle (_period, true);
        } catch (OpenFileError &) {
                LOG_GENERAL_NC ("Could not open film info file");
-               fclose (asset_file);
                return 0;
        }
 
        /* Offset of the last dcp::FrameInfo in the info file */
-       int const n = (boost::filesystem::file_size(info_file->file()) / _info_size) - 1;
-       LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->file()), _info_size);
+       int const n = (boost::filesystem::file_size(info_file->get().path()) / _info_size) - 1;
+       LOG_GENERAL ("The last FI is %1; info file is %2, info size %3", n, boost::filesystem::file_size(info_file->get().path()), _info_size);
 
-       Frame first_nonexistant_frame;
+       Frame first_nonexistent_frame;
        if (film()->three_d()) {
                /* Start looking at the last left frame */
-               first_nonexistant_frame = n / 2;
+               first_nonexistent_frame = n / 2;
        } else {
-               first_nonexistant_frame = n;
+               first_nonexistent_frame = n;
        }
 
-       while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistant_frame) && first_nonexistant_frame > 0) {
-               --first_nonexistant_frame;
+       while (!existing_picture_frame_ok(asset_file, info_file, first_nonexistent_frame) && first_nonexistent_frame > 0) {
+               --first_nonexistent_frame;
        }
 
-       if (!film()->three_d() && first_nonexistant_frame > 0) {
+       if (!film()->three_d() && first_nonexistent_frame > 0) {
                /* If we are doing 3D we might have found a good L frame with no R, so only
                   do this if we're in 2D and we've just found a good B(oth) frame.
                */
-               ++first_nonexistant_frame;
+               ++first_nonexistent_frame;
        }
 
-       LOG_GENERAL ("Proceeding with first nonexistant frame %1", first_nonexistant_frame);
+       LOG_GENERAL ("Proceeding with first nonexistent frame %1", first_nonexistent_frame);
 
-       fclose (asset_file);
-
-       return first_nonexistant_frame;
+       return first_nonexistent_frame;
 }
 
+
 void
 ReelWriter::write (shared_ptr<const Data> encoded, Frame frame, Eyes eyes)
 {
@@ -298,9 +313,9 @@ ReelWriter::write (shared_ptr<const Data> encoded, Frame frame, Eyes eyes)
                return;
        }
 
-       dcp::FrameInfo fin = _picture_asset_writer->write (encoded->data(), encoded->size());
+       auto fin = _picture_asset_writer->write (encoded->data(), encoded->size());
        write_frame_info (frame, eyes, fin);
-       _last_written[eyes] = encoded;
+       _last_written[static_cast<int>(eyes)] = encoded;
 }
 
 
@@ -331,6 +346,7 @@ ReelWriter::fake_write (int size)
        _picture_asset_writer->fake_write (size);
 }
 
+
 void
 ReelWriter::repeat_write (Frame frame, Eyes eyes)
 {
@@ -339,13 +355,14 @@ ReelWriter::repeat_write (Frame frame, Eyes eyes)
                return;
        }
 
-       dcp::FrameInfo fin = _picture_asset_writer->write (
-               _last_written[eyes]->data(),
-               _last_written[eyes]->size()
+       auto fin = _picture_asset_writer->write (
+               _last_written[static_cast<int>(eyes)]->data(),
+               _last_written[static_cast<int>(eyes)]->size()
                );
        write_frame_info (frame, eyes, fin);
 }
 
+
 void
 ReelWriter::finish (boost::filesystem::path output_dcp)
 {
@@ -374,8 +391,8 @@ ReelWriter::finish (boost::filesystem::path output_dcp)
 
                boost::filesystem::create_hard_link (video_from, video_to, ec);
                if (ec) {
-                       LOG_WARNING_NC ("Hard-link failed; copying instead");
-                       shared_ptr<Job> job = _job.lock ();
+                       LOG_WARNING("Hard-link failed (%1); copying instead", error_details(ec));
+                       auto job = _job.lock ();
                        if (job) {
                                job->sub (_("Copying video file into DCP"));
                                try {
@@ -387,7 +404,7 @@ ReelWriter::finish (boost::filesystem::path output_dcp)
                        } else {
                                boost::filesystem::copy_file (video_from, video_to, ec);
                                if (ec) {
-                                       LOG_ERROR ("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), ec.message());
+                                       LOG_ERROR("Failed to copy video file from %1 to %2 (%3)", video_from.string(), video_to.string(), error_details(ec));
                                        throw FileError (ec.message(), video_from);
                                }
                        }
@@ -399,14 +416,14 @@ ReelWriter::finish (boost::filesystem::path output_dcp)
        /* Move the audio asset into the DCP */
        if (_sound_asset) {
                boost::filesystem::path audio_to = output_dcp;
-               string const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
+               auto const aaf = audio_asset_filename (_sound_asset, _reel_index, _reel_count, _content_summary);
                audio_to /= aaf;
 
                boost::system::error_code ec;
                boost::filesystem::rename (film()->file(aaf), audio_to, ec);
                if (ec) {
                        throw FileError (
-                               String::compose (_("could not move audio asset into the DCP (%1)"), ec.value ()), aaf
+                               String::compose(_("could not move audio asset into the DCP (%1)"), error_details(ec)), aaf
                                );
                }
 
@@ -416,14 +433,14 @@ ReelWriter::finish (boost::filesystem::path output_dcp)
        if (_atmos_asset) {
                _atmos_asset_writer->finalize ();
                boost::filesystem::path atmos_to = output_dcp;
-               string const aaf = atmos_asset_filename (_atmos_asset, _reel_index, _reel_count, _content_summary);
+               auto const aaf = atmos_asset_filename (_atmos_asset, _reel_index, _reel_count, _content_summary);
                atmos_to /= aaf;
 
                boost::system::error_code ec;
                boost::filesystem::rename (film()->file(aaf), atmos_to, ec);
                if (ec) {
                        throw FileError (
-                               String::compose (_("could not move atmos asset into the DCP (%1)"), ec.value ()), aaf
+                               String::compose(_("could not move atmos asset into the DCP (%1)"), error_details(ec)), aaf
                                );
                }
 
@@ -431,58 +448,79 @@ ReelWriter::finish (boost::filesystem::path output_dcp)
        }
 }
 
-template <class T>
-shared_ptr<T>
+
+/** Try to make a ReelAsset for a subtitles or closed captions in a given period in the DCP.
+ *  A SubtitleAsset can be provided, or we will use one from @ref refs if not.
+ */
+template <class Interop, class SMPTE, class Result>
+shared_ptr<Result>
 maybe_add_text (
        shared_ptr<dcp::SubtitleAsset> asset,
        int64_t picture_duration,
        shared_ptr<dcp::Reel> reel,
+       int reel_index,
+       int reel_count,
+       optional<string> content_summary,
        list<ReferencedReelAsset> const & refs,
-       list<shared_ptr<Font> > const & fonts,
+       FontIdMap const& fonts,
+       shared_ptr<dcpomatic::Font> chosen_interop_font,
+       dcp::ArrayData default_font,
        shared_ptr<const Film> film,
        DCPTimePeriod period,
-       boost::filesystem::path output_dcp
+       boost::filesystem::path output_dcp,
+       bool text_only
        )
 {
        Frame const period_duration = period.duration().frames_round(film->video_frame_rate());
 
-       shared_ptr<T> reel_asset;
+       shared_ptr<Result> reel_asset;
 
        if (asset) {
-               /* Add the font to the subtitle content */
-               BOOST_FOREACH (shared_ptr<Font> j, fonts) {
-                       asset->add_font (j->id(), j->file().get_value_or(default_font_file()));
+               if (film->interop()) {
+                       if (chosen_interop_font) {
+                               /* We only add one font, as Interop will ignore subsequent ones (and some validators will
+                                * complain if they are even present)
+                                */
+                               asset->add_font(fonts.get(chosen_interop_font), chosen_interop_font->data().get_value_or(default_font));
+                       }
+               } else {
+                       for (auto const& font: fonts.map()) {
+                               asset->add_font(font.second, font.first->data().get_value_or(default_font));
+                       }
                }
 
-               if (dynamic_pointer_cast<dcp::InteropSubtitleAsset> (asset)) {
-                       boost::filesystem::path directory = output_dcp / asset->id ();
+               if (auto interop = dynamic_pointer_cast<dcp::InteropSubtitleAsset>(asset)) {
+                       auto directory = output_dcp / interop->id ();
                        boost::filesystem::create_directories (directory);
-                       asset->write (directory / ("sub_" + asset->id() + ".xml"));
-               } else {
+                       interop->write (directory / subtitle_asset_filename(asset, reel_index, reel_count, content_summary, ".xml"));
+                       reel_asset = make_shared<Interop> (
+                               interop,
+                               dcp::Fraction(film->video_frame_rate(), 1),
+                               picture_duration,
+                               0
+                               );
+               } else if (auto smpte = dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)) {
                        /* All our assets should be the same length; use the picture asset length here
                           as a reference to set the subtitle one.  We'll use the duration rather than
                           the intrinsic duration; we don't care if the picture asset has been trimmed, we're
                           just interested in its presentation length.
                        */
-                       dynamic_pointer_cast<dcp::SMPTESubtitleAsset>(asset)->set_intrinsic_duration (picture_duration);
-
-                       asset->write (
-                               output_dcp / ("sub_" + asset->id() + ".mxf")
+                       smpte->set_intrinsic_duration(picture_duration);
+                       smpte->write (
+                               output_dcp / subtitle_asset_filename(asset, reel_index, reel_count, content_summary, ".mxf")
                                );
-               }
-
-               reel_asset.reset (
-                       new T (
-                               asset,
-                               dcp::Fraction (film->video_frame_rate(), 1),
+                       reel_asset = make_shared<SMPTE> (
+                               smpte,
+                               dcp::Fraction(film->video_frame_rate(), 1),
                                picture_duration,
                                0
-                               )
-                       );
+                               );
+               }
+
        } else {
                /* We don't have a subtitle asset of our own; hopefully we have one to reference */
-               BOOST_FOREACH (ReferencedReelAsset j, refs) {
-                       shared_ptr<T> k = dynamic_pointer_cast<T> (j.asset);
+               for (auto j: refs) {
+                       auto k = dynamic_pointer_cast<Result> (j.asset);
                        if (k && j.period == period) {
                                reel_asset = k;
                                /* If we have a hash for this asset in the CPL, assume that it is correct */
@@ -494,7 +532,7 @@ maybe_add_text (
        }
 
        if (reel_asset) {
-               if (reel_asset->actual_duration() != period_duration) {
+               if (!text_only && reel_asset->actual_duration() != period_duration) {
                        throw ProgrammingError (
                                __FILE__, __LINE__,
                                String::compose ("%1 vs %2", reel_asset->actual_duration(), period_duration)
@@ -514,20 +552,20 @@ ReelWriter::create_reel_picture (shared_ptr<dcp::Reel> reel, list<ReferencedReel
 
        if (_picture_asset) {
                /* We have made a picture asset of our own.  Put it into the reel */
-               shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
+               auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (_picture_asset);
                if (mono) {
-                       reel_asset.reset (new dcp::ReelMonoPictureAsset (mono, 0));
+                       reel_asset = make_shared<dcp::ReelMonoPictureAsset>(mono, 0);
                }
 
-               shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
+               auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (_picture_asset);
                if (stereo) {
-                       reel_asset.reset (new dcp::ReelStereoPictureAsset (stereo, 0));
+                       reel_asset = make_shared<dcp::ReelStereoPictureAsset>(stereo, 0);
                }
        } else {
                LOG_GENERAL ("no picture asset of our own; look through %1", refs.size());
                /* We don't have a picture asset of our own; hopefully we have one to reference */
-               BOOST_FOREACH (ReferencedReelAsset j, refs) {
-                       shared_ptr<dcp::ReelPictureAsset> k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
+               for (auto j: refs) {
+                       auto k = dynamic_pointer_cast<dcp::ReelPictureAsset> (j.asset);
                        if (k) {
                                LOG_GENERAL ("candidate picture asset period is %1-%2", j.period.from.get(), j.period.to.get());
                        }
@@ -564,12 +602,12 @@ ReelWriter::create_reel_sound (shared_ptr<dcp::Reel> reel, list<ReferencedReelAs
 
        if (_sound_asset) {
                /* We have made a sound asset of our own.  Put it into the reel */
-               reel_asset.reset (new dcp::ReelSoundAsset(_sound_asset, 0));
+               reel_asset = make_shared<dcp::ReelSoundAsset>(_sound_asset, 0);
        } else {
                LOG_GENERAL ("no sound asset of our own; look through %1", refs.size());
                /* We don't have a sound asset of our own; hopefully we have one to reference */
-               BOOST_FOREACH (ReferencedReelAsset j, refs) {
-                       shared_ptr<dcp::ReelSoundAsset> k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
+               for (auto j: refs) {
+                       auto k = dynamic_pointer_cast<dcp::ReelSoundAsset> (j.asset);
                        if (k) {
                                LOG_GENERAL ("candidate sound asset period is %1-%2", j.period.from.get(), j.period.to.get());
                        }
@@ -583,7 +621,7 @@ ReelWriter::create_reel_sound (shared_ptr<dcp::Reel> reel, list<ReferencedReelAs
                }
        }
 
-       Frame const period_duration = _period.duration().frames_round(film()->video_frame_rate());
+       auto const period_duration = _period.duration().frames_round(film()->video_frame_rate());
 
        DCPOMATIC_ASSERT (reel_asset);
        if (reel_asset->actual_duration() != period_duration) {
@@ -608,78 +646,148 @@ void
 ReelWriter::create_reel_text (
        shared_ptr<dcp::Reel> reel,
        list<ReferencedReelAsset> const & refs,
-       list<shared_ptr<Font> > const& fonts,
+       FontIdMap const& fonts,
+       shared_ptr<dcpomatic::Font> chosen_interop_font,
        int64_t duration,
-       boost::filesystem::path output_dcp
+       boost::filesystem::path output_dcp,
+       bool ensure_subtitles,
+       set<DCPTextTrack> ensure_closed_captions
        ) const
 {
-       shared_ptr<dcp::ReelSubtitleAsset> subtitle = maybe_add_text<dcp::ReelSubtitleAsset> (
-               _subtitle_asset, duration, reel, refs, fonts, film(), _period, output_dcp
+       auto subtitle = maybe_add_text<dcp::ReelInteropSubtitleAsset, dcp::ReelSMPTESubtitleAsset, dcp::ReelSubtitleAsset> (
+               _subtitle_asset, duration, reel, _reel_index, _reel_count, _content_summary, refs, fonts, chosen_interop_font, _default_font, film(), _period, output_dcp, _text_only
                );
-       if (subtitle && !film()->subtitle_languages().empty()) {
-               subtitle->set_language (film()->subtitle_languages().front());
+
+       if (subtitle) {
+               /* We have a subtitle asset that we either made or are referencing */
+               if (auto main_language = film()->subtitle_languages().first) {
+                       subtitle->set_language (*main_language);
+               }
+       } else if (ensure_subtitles) {
+               /* We had no subtitle asset, but we've been asked to make sure there is one */
+               subtitle = maybe_add_text<dcp::ReelInteropSubtitleAsset, dcp::ReelSMPTESubtitleAsset, dcp::ReelSubtitleAsset> (
+                       empty_text_asset(TextType::OPEN_SUBTITLE, optional<DCPTextTrack>(), true),
+                       duration,
+                       reel,
+                       _reel_index,
+                       _reel_count,
+                       _content_summary,
+                       refs,
+                       fonts,
+                       chosen_interop_font,
+                       _default_font,
+                       film(),
+                       _period,
+                       output_dcp,
+                       _text_only
+                       );
        }
 
-       for (map<DCPTextTrack, shared_ptr<dcp::SubtitleAsset> >::const_iterator i = _closed_caption_assets.begin(); i != _closed_caption_assets.end(); ++i) {
-               shared_ptr<dcp::ReelClosedCaptionAsset> a = maybe_add_text<dcp::ReelClosedCaptionAsset> (
-                       i->second, duration, reel, refs, fonts, film(), _period, output_dcp
+       for (auto const& i: _closed_caption_assets) {
+               auto a = maybe_add_text<dcp::ReelInteropClosedCaptionAsset, dcp::ReelSMPTEClosedCaptionAsset, dcp::ReelClosedCaptionAsset> (
+                       i.second, duration, reel, _reel_index, _reel_count, _content_summary, refs, fonts, chosen_interop_font, _default_font, film(), _period, output_dcp, _text_only
                        );
-               if (a) {
-                       a->set_annotation_text (i->first.name);
-                       if (!i->first.language.empty()) {
-                               a->set_language (dcp::LanguageTag(i->first.language));
-                       }
+               DCPOMATIC_ASSERT (a);
+               a->set_annotation_text (i.first.name);
+               if (i.first.language) {
+                       a->set_language (i.first.language.get());
+               }
+
+               ensure_closed_captions.erase (i.first);
+       }
+
+       /* Make empty tracks for anything we've been asked to ensure but that we haven't added */
+       for (auto i: ensure_closed_captions) {
+               auto a = maybe_add_text<dcp::ReelInteropClosedCaptionAsset, dcp::ReelSMPTEClosedCaptionAsset, dcp::ReelClosedCaptionAsset> (
+                       empty_text_asset(TextType::CLOSED_CAPTION, i, true),
+                       duration,
+                       reel,
+                       _reel_index,
+                       _reel_count,
+                       _content_summary,
+                       refs,
+                       fonts,
+                       chosen_interop_font,
+                       _default_font,
+                       film(),
+                       _period,
+                       output_dcp,
+                       _text_only
+                       );
+               DCPOMATIC_ASSERT (a);
+               a->set_annotation_text (i.name);
+               if (i.language) {
+                       a->set_language (i.language.get());
                }
        }
 }
 
 
-
 void
 ReelWriter::create_reel_markers (shared_ptr<dcp::Reel> reel) const
 {
-       Film::Markers markers = film()->markers();
+       auto markers = film()->markers();
        film()->add_ffoc_lfoc(markers);
        Film::Markers reel_markers;
-       for (Film::Markers::const_iterator i = markers.begin(); i != markers.end(); ++i) {
-               if (_period.contains(i->second)) {
-                       reel_markers[i->first] = i->second;
+       for (auto const& i: markers) {
+               if (_period.contains(i.second)) {
+                       reel_markers[i.first] = i.second;
                }
        }
 
        if (!reel_markers.empty ()) {
-               shared_ptr<dcp::ReelMarkersAsset> ma (new dcp::ReelMarkersAsset(dcp::Fraction(film()->video_frame_rate(), 1), 0));
-               for (map<dcp::Marker, DCPTime>::const_iterator i = reel_markers.begin(); i != reel_markers.end(); ++i) {
-                       int h, m, s, f;
-                       DCPTime relative = i->second - _period.from;
-                       relative.split (film()->video_frame_rate(), h, m, s, f);
-                       ma->set (i->first, dcp::Time(h, m, s, f, film()->video_frame_rate()));
+               auto ma = make_shared<dcp::ReelMarkersAsset>(dcp::Fraction(film()->video_frame_rate(), 1), reel->duration());
+               for (auto const& i: reel_markers) {
+                       DCPTime relative = i.second - _period.from;
+                       auto hmsf = relative.split (film()->video_frame_rate());
+                       ma->set (i.first, dcp::Time(hmsf.h, hmsf.m, hmsf.s, hmsf.f, film()->video_frame_rate()));
                }
                reel->add (ma);
        }
 }
 
 
+/** @param ensure_subtitles true to make sure the reel has a subtitle asset.
+ *  @param ensure_closed_captions make sure the reel has these closed caption tracks.
+ */
 shared_ptr<dcp::Reel>
-ReelWriter::create_reel (list<ReferencedReelAsset> const & refs, list<shared_ptr<Font> > const & fonts, boost::filesystem::path output_dcp)
+ReelWriter::create_reel (
+       list<ReferencedReelAsset> const & refs,
+       FontIdMap const & fonts,
+       shared_ptr<dcpomatic::Font> chosen_interop_font,
+       boost::filesystem::path output_dcp,
+       bool ensure_subtitles,
+       set<DCPTextTrack> ensure_closed_captions
+       )
 {
        LOG_GENERAL ("create_reel for %1-%2; %3 of %4", _period.from.get(), _period.to.get(), _reel_index, _reel_count);
 
-       shared_ptr<dcp::Reel> reel (new dcp::Reel());
-       shared_ptr<dcp::ReelPictureAsset> reel_picture_asset = create_reel_picture (reel, refs);
-       create_reel_sound (reel, refs);
-       create_reel_text (reel, refs, fonts, reel_picture_asset->actual_duration(), output_dcp);
-       create_reel_markers (reel);
+       auto reel = make_shared<dcp::Reel>();
+
+       /* This is a bit of a hack; in the strange `_text_only' mode we have no picture, so we don't know
+        * how long the subtitle / CCAP assets should be.  However, since we're only writing them to see
+        * how big they are, we don't care about that.
+        */
+       int64_t duration = 0;
+       if (!_text_only) {
+               auto reel_picture_asset = create_reel_picture (reel, refs);
+               duration = reel_picture_asset->actual_duration ();
+               create_reel_sound (reel, refs);
+               create_reel_markers (reel);
+       }
+
+       create_reel_text (reel, refs, fonts, chosen_interop_font, duration, output_dcp, ensure_subtitles, ensure_closed_captions);
 
        if (_atmos_asset) {
-               reel->add (shared_ptr<dcp::ReelAtmosAsset>(new dcp::ReelAtmosAsset(_atmos_asset, 0)));
+               reel->add (make_shared<dcp::ReelAtmosAsset>(_atmos_asset, 0));
        }
 
        return reel;
 }
 
 void
-ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
+ReelWriter::calculate_digests (std::function<void (float)> set_progress)
+try
 {
        if (_picture_asset) {
                _picture_asset->hash (set_progress);
@@ -692,8 +800,13 @@ ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
        if (_atmos_asset) {
                _atmos_asset->hash (set_progress);
        }
+} catch (boost::thread_interrupted) {
+       /* set_progress contains an interruption_point, so any of these methods
+        * may throw thread_interrupted, at which point we just give up.
+        */
 }
 
+
 Frame
 ReelWriter::start () const
 {
@@ -712,16 +825,82 @@ ReelWriter::write (shared_ptr<const AudioBuffers> audio)
        _sound_asset_writer->write (audio->data(), audio->frames());
 }
 
+
+shared_ptr<dcp::SubtitleAsset>
+ReelWriter::empty_text_asset (TextType type, optional<DCPTextTrack> track, bool with_dummy) const
+{
+       shared_ptr<dcp::SubtitleAsset> asset;
+
+       auto lang = film()->subtitle_languages();
+       if (film()->interop()) {
+               auto s = make_shared<dcp::InteropSubtitleAsset>();
+               s->set_movie_title (film()->name());
+               if (type == TextType::OPEN_SUBTITLE) {
+                       s->set_language (lang.first ? lang.first->to_string() : "Unknown");
+               } else if (track->language) {
+                       s->set_language (track->language->to_string());
+               }
+               s->set_reel_number (raw_convert<string> (_reel_index + 1));
+               asset = s;
+       } else {
+               auto s = make_shared<dcp::SMPTESubtitleAsset>();
+               s->set_content_title_text (film()->name());
+               s->set_metadata (mxf_metadata());
+               if (type == TextType::OPEN_SUBTITLE && lang.first) {
+                       s->set_language (*lang.first);
+               } else if (track && track->language) {
+                       s->set_language (dcp::LanguageTag(track->language->to_string()));
+               }
+               s->set_edit_rate (dcp::Fraction (film()->video_frame_rate(), 1));
+               s->set_reel_number (_reel_index + 1);
+               s->set_time_code_rate (film()->video_frame_rate());
+               s->set_start_time (dcp::Time ());
+               if (film()->encrypted()) {
+                       s->set_key (film()->key());
+               }
+               if (with_dummy) {
+                       s->add (
+                               std::make_shared<dcp::SubtitleString>(
+                                       optional<std::string>(),
+                                       false,
+                                       false,
+                                       false,
+                                       dcp::Colour(),
+                                       42,
+                                       1.0,
+                                       dcp::Time(0, 0, 0, 0, 24),
+                                       dcp::Time(0, 0, 1, 0, 24),
+                                       0.5,
+                                       dcp::HAlign::CENTER,
+                                       0.5,
+                                       dcp::VAlign::CENTER,
+                                       dcp::Direction::LTR,
+                                       " ",
+                                       dcp::Effect::NONE,
+                                       dcp::Colour(),
+                                       dcp::Time(),
+                                       dcp::Time(),
+                                       0
+                                       )
+                              );
+               }
+               asset = s;
+       }
+
+       return asset;
+}
+
+
 void
-ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
+ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period, FontIdMap const& fonts)
 {
        shared_ptr<dcp::SubtitleAsset> asset;
 
        switch (type) {
-       case TEXT_OPEN_SUBTITLE:
+       case TextType::OPEN_SUBTITLE:
                asset = _subtitle_asset;
                break;
-       case TEXT_CLOSED_CAPTION:
+       case TextType::CLOSED_CAPTION:
                DCPOMATIC_ASSERT (track);
                asset = _closed_caption_assets[*track];
                break;
@@ -730,42 +909,14 @@ ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track,
        }
 
        if (!asset) {
-               vector<dcp::LanguageTag> lang = film()->subtitle_languages();
-               if (film()->interop()) {
-                       shared_ptr<dcp::InteropSubtitleAsset> s (new dcp::InteropSubtitleAsset ());
-                       s->set_movie_title (film()->name());
-                       if (type == TEXT_OPEN_SUBTITLE) {
-                               s->set_language (lang.empty() ? "Unknown" : lang.front().to_string());
-                       } else if (!track->language.empty()) {
-                               s->set_language (track->language);
-                       }
-                       s->set_reel_number (raw_convert<string> (_reel_index + 1));
-                       asset = s;
-               } else {
-                       shared_ptr<dcp::SMPTESubtitleAsset> s (new dcp::SMPTESubtitleAsset ());
-                       s->set_content_title_text (film()->name());
-                       s->set_metadata (mxf_metadata());
-                       if (type == TEXT_OPEN_SUBTITLE && !lang.empty()) {
-                               s->set_language (lang.front());
-                       } else if (track && !track->language.empty()) {
-                               s->set_language (dcp::LanguageTag(track->language));
-                       }
-                       s->set_edit_rate (dcp::Fraction (film()->video_frame_rate(), 1));
-                       s->set_reel_number (_reel_index + 1);
-                       s->set_time_code_rate (film()->video_frame_rate());
-                       s->set_start_time (dcp::Time ());
-                       if (film()->encrypted()) {
-                               s->set_key (film()->key());
-                       }
-                       asset = s;
-               }
+               asset = empty_text_asset (type, track, false);
        }
 
        switch (type) {
-       case TEXT_OPEN_SUBTITLE:
+       case TextType::OPEN_SUBTITLE:
                _subtitle_asset = asset;
                break;
-       case TEXT_CLOSED_CAPTION:
+       case TextType::CLOSED_CAPTION:
                DCPOMATIC_ASSERT (track);
                _closed_caption_assets[*track] = asset;
                break;
@@ -773,44 +924,49 @@ ReelWriter::write (PlayerText subs, TextType type, optional<DCPTextTrack> track,
                DCPOMATIC_ASSERT (false);
        }
 
-       BOOST_FOREACH (StringText i, subs.string) {
-               /* XXX: couldn't / shouldn't we use period here rather than getting time from the subtitle? */
-               i.set_in  (i.in()  - dcp::Time (_period.from.seconds(), i.in().tcr));
-               i.set_out (i.out() - dcp::Time (_period.from.seconds(), i.out().tcr));
-               asset->add (shared_ptr<dcp::Subtitle>(new dcp::SubtitleString(i)));
+       /* timecode rate for subtitles we emit; we might as well stick to ms accuracy here, I think */
+       auto const tcr = 1000;
+
+       for (auto i: subs.string) {
+               i.set_in  (dcp::Time(period.from.seconds() - _period.from.seconds(), tcr));
+               i.set_out (dcp::Time(period.to.seconds() - _period.from.seconds(), tcr));
+               auto sub = make_shared<dcp::SubtitleString>(i);
+               if (type == TextType::OPEN_SUBTITLE) {
+                       sub->set_font(fonts.get(i.font));
+               }
+               asset->add(sub);
        }
 
-       BOOST_FOREACH (BitmapText i, subs.bitmap) {
+       for (auto i: subs.bitmap) {
                asset->add (
-                       shared_ptr<dcp::Subtitle>(
-                               new dcp::SubtitleImage(
-                                       i.image->as_png(),
-                                       dcp::Time(period.from.seconds() - _period.from.seconds(), film()->video_frame_rate()),
-                                       dcp::Time(period.to.seconds() - _period.from.seconds(), film()->video_frame_rate()),
-                                       i.rectangle.x, dcp::HALIGN_LEFT, i.rectangle.y, dcp::VALIGN_TOP,
-                                       dcp::Time(), dcp::Time()
-                                       )
+                       make_shared<dcp::SubtitleImage>(
+                               image_as_png(i.image),
+                               dcp::Time(period.from.seconds() - _period.from.seconds(), tcr),
+                               dcp::Time(period.to.seconds() - _period.from.seconds(), tcr),
+                               i.rectangle.x, dcp::HAlign::LEFT, i.rectangle.y, dcp::VAlign::TOP,
+                               dcp::Time(), dcp::Time()
                                )
                        );
        }
 }
 
+
 bool
-ReelWriter::existing_picture_frame_ok (FILE* asset_file, shared_ptr<InfoFileHandle> info_file, Frame frame) const
+ReelWriter::existing_picture_frame_ok (dcp::File& asset_file, shared_ptr<InfoFileHandle> info_file, Frame frame) const
 {
        LOG_GENERAL ("Checking existing picture frame %1", frame);
 
        /* Read the data from the info file; for 3D we just check the left
           frames until we find a good one.
        */
-       dcp::FrameInfo const info = read_frame_info (info_file, frame, film()->three_d() ? EYES_LEFT : EYES_BOTH);
+       auto const info = read_frame_info (info_file, frame, film()->three_d() ? Eyes::LEFT : Eyes::BOTH);
 
        bool ok = true;
 
        /* Read the data from the asset and hash it */
-       dcpomatic_fseek (asset_file, info.offset, SEEK_SET);
+       asset_file.seek(info.offset, SEEK_SET);
        ArrayData data (info.size);
-       size_t const read = fread (data.data(), 1, data.size(), asset_file);
+       size_t const read = asset_file.read(data.data(), 1, data.size());
        LOG_GENERAL ("Read %1 bytes of asset data; wanted %2", read, info.size);
        if (read != static_cast<size_t> (data.size ())) {
                LOG_GENERAL ("Existing frame %1 is incomplete", frame);