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 "constants.h"
27 #include "dcp_content.h"
28 #include "dcp_decoder.h"
30 #include "ffmpeg_image_proxy.h"
31 #include "frame_interval_checker.h"
33 #include "j2k_image_proxy.h"
34 #include "text_decoder.h"
35 #include "video_decoder.h"
38 #include <dcp/decrypted_kdm.h>
39 #include <dcp/mono_picture_asset.h>
40 #include <dcp/mono_picture_asset_reader.h>
41 #include <dcp/mono_picture_frame.h>
43 #include <dcp/reel_atmos_asset.h>
44 #include <dcp/reel_closed_caption_asset.h>
45 #include <dcp/reel_picture_asset.h>
46 #include <dcp/reel_sound_asset.h>
47 #include <dcp/reel_subtitle_asset.h>
48 #include <dcp/search.h>
49 #include <dcp/sound_asset_reader.h>
50 #include <dcp/sound_frame.h>
51 #include <dcp/stereo_picture_asset.h>
52 #include <dcp/stereo_picture_asset_reader.h>
53 #include <dcp/stereo_picture_frame.h>
54 #include <dcp/subtitle_image.h>
61 using std::dynamic_pointer_cast;
63 using std::make_shared;
65 using std::shared_ptr;
68 using boost::optional;
69 using namespace dcpomatic;
72 DCPDecoder::DCPDecoder (shared_ptr<const Film> film, shared_ptr<const DCPContent> content, bool fast, bool tolerant, shared_ptr<DCPDecoder> old)
74 , _dcp_content (content)
76 if (content->can_be_played()) {
78 video = make_shared<VideoDecoder>(this, content);
81 audio = make_shared<AudioDecoder>(this, content->audio, fast);
83 for (auto i: content->text) {
84 text.push_back (make_shared<TextDecoder>(this, i));
85 /* We should really call maybe_set_position() on this TextDecoder to set the time
86 * of the first subtitle, but it probably doesn't matter since we'll always
87 * have regularly occurring video (and maybe audio) content.
91 atmos = make_shared<AtmosDecoder>(this, content);
95 /* We try to avoid re-scanning the DCP's files every time we make a new DCPDecoder; we do this
96 by re-using the _reels list. Before we do this we need to check that nothing too serious
97 has changed in the DCPContent.
99 We do this by storing a digest of the important bits of the DCPContent and then checking that's
100 the same before we re-use _reels.
103 _lazy_digest = calculate_lazy_digest (content);
105 if (old && old->lazy_digest() == _lazy_digest) {
106 _reels = old->_reels;
109 auto cpl_list = dcp::find_and_resolve_cpls(content->directories(), tolerant);
111 if (cpl_list.empty()) {
112 throw DCPError (_("No CPLs found in DCP."));
115 shared_ptr<dcp::CPL> cpl;
116 for (auto i: cpl_list) {
117 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
123 /* No CPL found; probably an old file that doesn't specify it;
124 just use the first one.
126 cpl = cpl_list.front();
129 if (content->kdm()) {
130 cpl->add (decrypt_kdm_with_helpful_error(content->kdm().get()));
133 _reels = cpl->reels ();
136 set_decode_referenced (false);
138 _reel = _reels.begin ();
141 _font_id_allocator.add_fonts_from_reels(_reels);
142 _font_id_allocator.allocate();
149 if (!_dcp_content->can_be_played()) {
153 if (_reel == _reels.end()) {
160 auto const vfr = _dcp_content->active_video_frame_rate (film());
162 /* Frame within the (played part of the) reel that is coming up next */
163 auto const frame = _next.frames_round (vfr);
165 auto picture_asset = (*_reel)->main_picture()->asset();
166 DCPOMATIC_ASSERT (picture_asset);
168 /* We must emit texts first as when we emit the video for this frame
169 it will expect already to have the texts.
171 pass_texts (_next, picture_asset->size());
173 if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
174 auto const entry_point = (*_reel)->main_picture()->entry_point().get_value_or(0);
178 std::make_shared<J2KImageProxy>(
179 _mono_reader->get_frame (entry_point + frame),
180 picture_asset->size(),
189 std::make_shared<J2KImageProxy>(
190 _stereo_reader->get_frame (entry_point + frame),
191 picture_asset->size(),
201 std::make_shared<J2KImageProxy>(
202 _stereo_reader->get_frame (entry_point + frame),
203 picture_asset->size(),
213 if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
214 auto const entry_point = (*_reel)->main_sound()->entry_point().get_value_or(0);
215 auto sf = _sound_reader->get_frame (entry_point + frame);
216 auto from = sf->data ();
218 int const channels = _dcp_content->audio->stream()->channels ();
219 int const frames = sf->size() / (3 * channels);
220 auto data = make_shared<AudioBuffers>(channels, frames);
221 auto data_data = data->data();
222 for (int i = 0; i < frames; ++i) {
223 for (int j = 0; j < channels; ++j) {
224 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
229 audio->emit (film(), _dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
233 DCPOMATIC_ASSERT (_atmos_metadata);
234 auto const entry_point = (*_reel)->atmos()->entry_point().get_value_or(0);
235 atmos->emit (film(), _atmos_reader->get_frame(entry_point + frame), _offset + frame, *_atmos_metadata);
238 _next += ContentTime::from_frames (1, vfr);
240 if ((*_reel)->main_picture ()) {
241 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
243 _next = ContentTime ();
252 DCPDecoder::pass_texts (ContentTime next, dcp::Size size)
254 auto decoder = text.begin ();
255 if (decoder == text.end()) {
256 /* It's possible that there is now a main subtitle but no TextDecoders, for example if
257 the CPL has just changed but the TextContent's texts have not been recreated yet.
262 if ((*_reel)->main_subtitle()) {
265 (*_reel)->main_subtitle()->asset(),
266 _dcp_content->reference_text(TextType::OPEN_SUBTITLE),
267 (*_reel)->main_subtitle()->entry_point().get_value_or(0),
274 for (auto i: (*_reel)->closed_captions()) {
276 next, i->asset(), _dcp_content->reference_text(TextType::CLOSED_CAPTION), i->entry_point().get_value_or(0), *decoder, size
283 DCPDecoder::pass_texts (
284 ContentTime next, shared_ptr<dcp::SubtitleAsset> asset, bool reference, int64_t entry_point, shared_ptr<TextDecoder> decoder, dcp::Size size
287 auto const vfr = _dcp_content->active_video_frame_rate (film());
288 /* Frame within the (played part of the) reel that is coming up next */
289 auto const frame = next.frames_round (vfr);
291 if (_decode_referenced || !reference) {
292 auto subs = asset->subtitles_during (
293 dcp::Time (entry_point + frame, vfr, vfr),
294 dcp::Time (entry_point + frame + 1, vfr, vfr),
298 vector<dcp::SubtitleString> strings;
301 auto is = dynamic_pointer_cast<const dcp::SubtitleString>(i);
303 if (!strings.empty() && (strings.back().in() != is->in() || strings.back().out() != is->out())) {
304 auto b = strings.back();
305 decoder->emit_plain (
307 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
308 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
311 asset->subtitle_standard()
316 dcp::SubtitleString is_copy = *is;
317 if (is_copy.font()) {
318 is_copy.set_font(_font_id_allocator.font_id(_reel - _reels.begin(), asset->id(), is_copy.font().get()));
320 is_copy.set_font(_font_id_allocator.default_font_id());
322 strings.push_back(is_copy);
325 /* XXX: perhaps these image subs should also be collected together like the string ones are;
326 this would need to be done both here and in DCPSubtitleDecoder.
329 auto ii = dynamic_pointer_cast<const dcp::SubtitleImage>(i);
331 emit_subtitle_image (
333 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->in().as_seconds ()),
334 ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (i->out().as_seconds ())
343 if (!strings.empty()) {
344 auto b = strings.back();
345 decoder->emit_plain (
347 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.in().as_seconds()),
348 ContentTime::from_frames(_offset - entry_point, vfr) + ContentTime::from_seconds(b.out().as_seconds())
351 asset->subtitle_standard()
360 DCPDecoder::next_reel ()
362 _offset += (*_reel)->main_picture()->actual_duration();
369 DCPDecoder::get_readers ()
371 if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
372 _mono_reader.reset ();
373 _stereo_reader.reset ();
374 _sound_reader.reset ();
375 _atmos_reader.reset ();
379 if (video && !video->ignore() && (*_reel)->main_picture()) {
380 auto asset = (*_reel)->main_picture()->asset ();
381 auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
382 auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
383 DCPOMATIC_ASSERT (mono || stereo);
385 _mono_reader = mono->start_read ();
386 _mono_reader->set_check_hmac (false);
387 _stereo_reader.reset ();
389 _stereo_reader = stereo->start_read ();
390 _stereo_reader->set_check_hmac (false);
391 _mono_reader.reset ();
394 _mono_reader.reset ();
395 _stereo_reader.reset ();
398 if (audio && !audio->ignore() && (*_reel)->main_sound()) {
399 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
400 _sound_reader->set_check_hmac (false);
402 _sound_reader.reset ();
405 if ((*_reel)->atmos()) {
406 auto asset = (*_reel)->atmos()->asset();
407 _atmos_reader = asset->start_read();
408 _atmos_reader->set_check_hmac (false);
409 _atmos_metadata = AtmosMetadata (asset);
411 _atmos_reader.reset ();
412 _atmos_metadata = boost::none;
418 DCPDecoder::seek (ContentTime t, bool accurate)
420 if (!_dcp_content->can_be_played ()) {
424 Decoder::seek (t, accurate);
426 _reel = _reels.begin ();
430 int const pre_roll_seconds = 2;
432 /* Pre-roll for subs */
434 auto pre = t - ContentTime::from_seconds (pre_roll_seconds);
435 if (pre < ContentTime()) {
436 pre = ContentTime ();
439 /* Seek to pre-roll position */
442 _reel != _reels.end() &&
443 pre >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
446 auto rd = ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
452 /* Pass texts in the pre-roll */
454 if (_reel != _reels.end()) {
455 auto const vfr = _dcp_content->active_video_frame_rate (film());
456 for (int i = 0; i < pre_roll_seconds * vfr; ++i) {
457 pass_texts (pre, (*_reel)->main_picture()->asset()->size());
458 pre += ContentTime::from_frames (1, vfr);
462 /* Seek to correct position */
465 _reel != _reels.end() &&
466 t >= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()))
469 t -= ContentTime::from_frames ((*_reel)->main_picture()->actual_duration(), _dcp_content->active_video_frame_rate(film()));
478 DCPDecoder::set_decode_referenced (bool r)
480 _decode_referenced = r;
483 video->set_ignore (_dcp_content->reference_video() && !_decode_referenced);
486 audio->set_ignore (_dcp_content->reference_audio() && !_decode_referenced);
492 DCPDecoder::set_forced_reduction (optional<int> reduction)
494 _forced_reduction = reduction;
499 DCPDecoder::calculate_lazy_digest (shared_ptr<const DCPContent> c) const
502 for (auto i: c->paths()) {
505 if (_dcp_content->kdm()) {
506 d.add(_dcp_content->kdm()->id());
508 d.add (static_cast<bool>(c->cpl()));
510 d.add (c->cpl().get());
517 DCPDecoder::position () const
519 return ContentTime::from_frames(_offset, _dcp_content->active_video_frame_rate(film())) + _next;