2 Copyright (C) 2014-2022 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
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.
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.
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/>.
22 #include "atmos_decoder.h"
23 #include "audio_content.h"
24 #include "audio_decoder.h"
26 #include "dcp_content.h"
27 #include "dcp_decoder.h"
29 #include "ffmpeg_image_proxy.h"
30 #include "frame_interval_checker.h"
32 #include "j2k_image_proxy.h"
33 #include "text_decoder.h"
34 #include "video_decoder.h"
37 #include <dcp/decrypted_kdm.h>
38 #include <dcp/mono_picture_asset.h>
39 #include <dcp/mono_picture_asset_reader.h>
40 #include <dcp/mono_picture_frame.h>
42 #include <dcp/reel_atmos_asset.h>
43 #include <dcp/reel_closed_caption_asset.h>
44 #include <dcp/reel_picture_asset.h>
45 #include <dcp/reel_sound_asset.h>
46 #include <dcp/reel_subtitle_asset.h>
47 #include <dcp/search.h>
48 #include <dcp/sound_asset_reader.h>
49 #include <dcp/sound_frame.h>
50 #include <dcp/stereo_picture_asset.h>
51 #include <dcp/stereo_picture_asset_reader.h>
52 #include <dcp/stereo_picture_frame.h>
53 #include <dcp/subtitle_image.h>
60 using std::dynamic_pointer_cast;
62 using std::make_shared;
64 using std::shared_ptr;
67 using boost::optional;
68 using namespace dcpomatic;
71 DCPDecoder::DCPDecoder (shared_ptr<const Film> film, shared_ptr<const DCPContent> content, bool fast, bool tolerant, shared_ptr<DCPDecoder> old)
73 , _dcp_content (content)
75 if (content->can_be_played()) {
77 video = make_shared<VideoDecoder>(this, content);
80 audio = make_shared<AudioDecoder>(this, content->audio, fast);
82 for (auto i: content->text) {
83 /* XXX: this time here should be the time of the first subtitle, not 0 */
84 text.push_back (make_shared<TextDecoder>(this, i, ContentTime()));
87 atmos = make_shared<AtmosDecoder>(this, content);
91 /* We try to avoid re-scanning the DCP's files every time we make a new DCPDecoder; we do this
92 by re-using the _reels list. Before we do this we need to check that nothing too serious
93 has changed in the DCPContent.
95 We do this by storing a digest of the important bits of the DCPContent and then checking that's
96 the same before we re-use _reels.
99 _lazy_digest = calculate_lazy_digest (content);
101 if (old && old->lazy_digest() == _lazy_digest) {
102 _reels = old->_reels;
105 auto cpl_list = dcp::find_and_resolve_cpls(content->directories(), tolerant);
107 if (cpl_list.empty()) {
108 throw DCPError (_("No CPLs found in DCP."));
111 shared_ptr<dcp::CPL> cpl;
112 for (auto i: cpl_list) {
113 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
119 /* No CPL found; probably an old file that doesn't specify it;
120 just use the first one.
122 cpl = cpl_list.front();
125 if (content->kdm()) {
126 cpl->add (decrypt_kdm_with_helpful_error(content->kdm().get()));
129 _reels = cpl->reels ();
132 set_decode_referenced (false);
134 _reel = _reels.begin ();
142 if (!_dcp_content->can_be_played()) {
146 if (_reel == _reels.end()) {
153 auto const vfr = _dcp_content->active_video_frame_rate (film());
155 /* Frame within the (played part of the) reel that is coming up next */
156 auto const frame = _next.frames_round (vfr);
158 auto picture_asset = (*_reel)->main_picture()->asset();
159 DCPOMATIC_ASSERT (picture_asset);
161 /* We must emit texts first as when we emit the video for this frame
162 it will expect already to have the texts.
164 pass_texts (_next, picture_asset->size());
166 if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
167 auto const entry_point = (*_reel)->main_picture()->entry_point().get_value_or(0);
171 std::make_shared<J2KImageProxy>(
172 _mono_reader->get_frame (entry_point + frame),
173 picture_asset->size(),
182 std::make_shared<J2KImageProxy>(
183 _stereo_reader->get_frame (entry_point + frame),
184 picture_asset->size(),
194 std::make_shared<J2KImageProxy>(
195 _stereo_reader->get_frame (entry_point + frame),
196 picture_asset->size(),
206 if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
207 auto const entry_point = (*_reel)->main_sound()->entry_point().get_value_or(0);
208 auto sf = _sound_reader->get_frame (entry_point + frame);
209 auto from = sf->data ();
211 int const channels = _dcp_content->audio->stream()->channels ();
212 int const frames = sf->size() / (3 * channels);
213 auto data = make_shared<AudioBuffers>(channels, frames);
214 auto data_data = data->data();
215 for (int i = 0; i < frames; ++i) {
216 for (int j = 0; j < channels; ++j) {
217 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
222 audio->emit (film(), _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
226 DCPOMATIC_ASSERT (_atmos_metadata);
227 auto const entry_point = (*_reel)->atmos()->entry_point().get_value_or(0);
228 atmos->emit (film(), _atmos_reader->get_frame(entry_point + frame), _offset + frame, *_atmos_metadata);
231 _next += ContentTime::from_frames (1, vfr);
233 if ((*_reel)->main_picture ()) {
234 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
236 _next = ContentTime ();
245 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
247 auto decoder = text.begin ();
248 if (decoder == text.end()) {
249 /* It's possible that there is now a main subtitle but no TextDecoders, for example if
250 the CPL has just changed but the TextContent's texts have not been recreated yet.
255 if ((*_reel)->main_subtitle()) {
258 (*_reel)->main_subtitle()->asset(),
259 _dcp_content->reference_text(TextType::OPEN_SUBTITLE),
260 (*_reel)->main_subtitle()->entry_point().get_value_or(0),
267 for (auto i: (*_reel)->closed_captions()) {
269 next, i->asset(), _dcp_content->reference_text(TextType::CLOSED_CAPTION), i->entry_point().get_value_or(0), *decoder, size
276 DCPDecoder::pass_texts (
277 ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size
280 auto const vfr = _dcp_content->active_video_frame_rate (film());
281 /* Frame within the (played part of the) reel that is coming up next */
282 auto const frame = next.frames_round (vfr);
284 if (_decode_referenced || !reference) {
285 auto subs = asset->subtitles_during (
286 dcp::Time (entry_point + frame, vfr, vfr),
287 dcp::Time (entry_point + frame + 1, vfr, vfr),
291 vector<dcp::SubtitleString> strings;
294 auto is = dynamic_pointer_cast<const dcp::SubtitleString>(i);
296 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
297 auto b = strings.back();
298 decoder->emit_plain (
300 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
301 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
308 strings.push_back (*is);
311 /* XXX: perhaps these image subs should also be collected together like the string ones are;
312 this would need to be done both here and in DCPSubtitleDecoder.
315 auto ii = dynamic_pointer_cast<const dcp::SubtitleImage>(i);
317 emit_subtitle_image (
319 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
320 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
329 if (!strings.empty()) {
330 auto b = strings.back();
331 decoder->emit_plain (
333 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
334 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
345 DCPDecoder::next_reel ()
347 _offset += (*_reel)->main_picture()->actual_duration();
354 DCPDecoder::get_readers ()
356 if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
357 _mono_reader.reset ();
358 _stereo_reader.reset ();
359 _sound_reader.reset ();
360 _atmos_reader.reset ();
364 if ((*_reel)->main_picture()) {
365 auto asset = (*_reel)->main_picture()->asset ();
366 auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
367 auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
368 DCPOMATIC_ASSERT (mono || stereo);
370 _mono_reader = mono->start_read ();
371 _mono_reader->set_check_hmac (false);
372 _stereo_reader.reset ();
374 _stereo_reader = stereo->start_read ();
375 _stereo_reader->set_check_hmac (false);
376 _mono_reader.reset ();
379 _mono_reader.reset ();
380 _stereo_reader.reset ();
383 if ((*_reel)->main_sound()) {
384 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
385 _sound_reader->set_check_hmac (false);
387 _sound_reader.reset ();
390 if ((*_reel)->atmos()) {
391 auto asset = (*_reel)->atmos()->asset();
392 _atmos_reader = asset->start_read();
393 _atmos_reader->set_check_hmac (false);
394 _atmos_metadata = AtmosMetadata (asset);
396 _atmos_reader.reset ();
397 _atmos_metadata = boost::none;
403 DCPDecoder::seek (ContentTime t, bool accurate)
405 if (!_dcp_content->can_be_played ()) {
409 Decoder::seek (t, accurate);
411 _reel = _reels.begin ();
415 int const pre_roll_seconds = 2;
417 /* Pre-roll for subs */
419 auto pre = t - ContentTime::from_seconds (pre_roll_seconds);
420 if (pre < ContentTime()) {
421 pre = ContentTime ();
424 /* Seek to pre-roll position */
427 _reel != _reels.end() &&
428 pre >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
431 auto rd = ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
437 /* Pass texts in the pre-roll */
439 auto const vfr = _dcp_content->active_video_frame_rate (film());
440 for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
441 pass_texts (pre, (*_reel)->main_picture()->asset()->size());
442 pre += ContentTime::from_frames (1, vfr);
445 /* Seek to correct position */
448 _reel != _reels.end() &&
449 t >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
452 t -= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
461 DCPDecoder::set_decode_referenced (bool r)
463 _decode_referenced = r;
466 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
469 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
475 DCPDecoder::set_forced_reduction (optional<int> reduction)
477 _forced_reduction = reduction;
482 DCPDecoder::calculate_lazy_digest (shared_ptr<const DCPContent> c) const
485 for (auto i: c->paths()) {
488 if (_dcp_content->kdm()) {
489 d.add(_dcp_content->kdm()->id());
491 d.add (static_cast<bool>(c->cpl()));
493 d.add (c->cpl().get());
500 DCPDecoder::position () const
502 return ContentTime::from_frames(_offset, _dcp_content->active_video_frame_rate(film())) + _next;