2 Copyright (C) 2012-2018 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/>.
21 /** @file src/ffmpeg_decoder.cc
22 * @brief A decoder using FFmpeg to decode content.
26 #include "exceptions.h"
30 #include "dcpomatic_log.h"
31 #include "ffmpeg_decoder.h"
32 #include "text_decoder.h"
33 #include "ffmpeg_audio_stream.h"
34 #include "ffmpeg_subtitle_stream.h"
35 #include "video_filter_graph.h"
36 #include "audio_buffers.h"
37 #include "ffmpeg_content.h"
38 #include "raw_image_proxy.h"
39 #include "video_decoder.h"
41 #include "audio_decoder.h"
42 #include "compose.hpp"
43 #include "text_content.h"
44 #include "audio_content.h"
45 #include "frame_interval_checker.h"
46 #include <dcp/subtitle_string.h>
47 #include <sub/ssa_reader.h>
48 #include <sub/subtitle.h>
49 #include <sub/collect.h>
51 #include <libavcodec/avcodec.h>
52 #include <libavformat/avformat.h>
54 #include <boost/foreach.hpp>
55 #include <boost/algorithm/string.hpp>
71 using boost::shared_ptr;
72 using boost::is_any_of;
74 using boost::optional;
75 using boost::dynamic_pointer_cast;
77 using namespace dcpomatic;
79 FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> film, shared_ptr<const FFmpegContent> c, bool fast)
82 , _have_current_subtitle (false)
84 if (c->video && c->video->use()) {
85 video.reset (new VideoDecoder (this, c));
86 _pts_offset = pts_offset (c->ffmpeg_audio_streams(), c->first_video(), c->active_video_frame_rate(film));
87 /* It doesn't matter what size or pixel format this is, it just needs to be black */
88 _black_image.reset (new Image (AV_PIX_FMT_RGB24, dcp::Size (128, 128), true));
89 _black_image->make_black ();
91 _pts_offset = ContentTime ();
95 audio.reset (new AudioDecoder (this, c->audio, fast));
99 /* XXX: this time here should be the time of the first subtitle, not 0 */
100 text.push_back (shared_ptr<TextDecoder> (new TextDecoder (this, c->only_text(), ContentTime())));
103 _next_time.resize (_format_context->nb_streams);
107 FFmpegDecoder::flush ()
109 /* Get any remaining frames */
114 /* XXX: should we reset _packet.data and size after each *_decode_* call? */
116 while (video && decode_video_packet()) {}
119 decode_audio_packet ();
122 /* Make sure all streams are the same length and round up to the next video frame */
124 FrameRateChange const frc = film()->active_frame_rate_change(_ffmpeg_content->position());
125 ContentTime full_length (_ffmpeg_content->full_length(film()), frc);
126 full_length = full_length.ceil (frc.source);
128 double const vfr = _ffmpeg_content->video_frame_rate().get();
129 Frame const f = full_length.frames_round (vfr);
130 Frame v = video->position(film()).get_value_or(ContentTime()).frames_round(vfr) + 1;
132 video->emit (film(), shared_ptr<const ImageProxy> (new RawImageProxy (_black_image)), v);
137 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, _ffmpeg_content->ffmpeg_audio_streams ()) {
138 ContentTime a = audio->stream_position(film(), i);
139 /* Unfortunately if a is 0 that really means that we don't know the stream position since
140 there has been no data on it since the last seek. In this case we'll just do nothing
141 here. I'm not sure if that's the right idea.
143 if (a > ContentTime()) {
144 while (a < full_length) {
145 ContentTime to_do = min (full_length - a, ContentTime::from_seconds (0.1));
146 shared_ptr<AudioBuffers> silence (new AudioBuffers (i->channels(), to_do.frames_ceil (i->frame_rate())));
147 silence->make_silent ();
148 audio->emit (film(), i, silence, a);
160 FFmpegDecoder::pass ()
162 #ifdef DCPOMATIC_VARIANT_SWAROOP
163 if (_ffmpeg_content->encrypted() && !_ffmpeg_content->kdm()) {
168 int r = av_read_frame (_format_context, &_packet);
170 /* AVERROR_INVALIDDATA can apparently be returned sometimes even when av_read_frame
171 has pretty-much succeeded (and hence generated data which should be processed).
172 Hence it makes sense to continue here in that case.
174 if (r < 0 && r != AVERROR_INVALIDDATA) {
175 if (r != AVERROR_EOF) {
176 /* Maybe we should fail here, but for now we'll just finish off instead */
178 av_strerror (r, buf, sizeof(buf));
179 LOG_ERROR (N_("error on av_read_frame (%1) (%2)"), &buf[0], r);
186 int const si = _packet.stream_index;
187 shared_ptr<const FFmpegContent> fc = _ffmpeg_content;
189 if (_video_stream && si == _video_stream.get() && video && !video->ignore()) {
190 decode_video_packet ();
191 } else if (fc->subtitle_stream() && fc->subtitle_stream()->uses_index(_format_context, si) && !only_text()->ignore()) {
192 decode_subtitle_packet ();
194 decode_audio_packet ();
197 av_packet_unref (&_packet);
201 /** @param data pointer to array of pointers to buffers.
202 * Only the first buffer will be used for non-planar data, otherwise there will be one per channel.
204 shared_ptr<AudioBuffers>
205 FFmpegDecoder::deinterleave_audio (shared_ptr<FFmpegAudioStream> stream) const
207 DCPOMATIC_ASSERT (bytes_per_audio_sample (stream));
209 DCPOMATIC_DISABLE_WARNINGS
210 int const size = av_samples_get_buffer_size (
211 0, stream->stream(_format_context)->codec->channels, _frame->nb_samples, audio_sample_format (stream), 1
213 DCPOMATIC_ENABLE_WARNINGS
215 /* XXX: can't we just use _frame->nb_samples directly here? */
216 /* XXX: can't we use swr_convert() to do the format conversion? */
218 /* Deinterleave and convert to float */
220 /* total_samples and frames will be rounded down here, so if there are stray samples at the end
221 of the block that do not form a complete sample or frame they will be dropped.
223 int const total_samples = size / bytes_per_audio_sample (stream);
224 int const channels = stream->channels();
225 int const frames = total_samples / channels;
226 shared_ptr<AudioBuffers> audio (new AudioBuffers (channels, frames));
227 float** data = audio->data();
229 switch (audio_sample_format (stream)) {
230 case AV_SAMPLE_FMT_U8:
232 uint8_t* p = reinterpret_cast<uint8_t *> (_frame->data[0]);
235 for (int i = 0; i < total_samples; ++i) {
236 data[channel][sample] = float(*p++) / (1 << 23);
239 if (channel == channels) {
247 case AV_SAMPLE_FMT_S16:
249 int16_t* p = reinterpret_cast<int16_t *> (_frame->data[0]);
252 for (int i = 0; i < total_samples; ++i) {
253 data[channel][sample] = float(*p++) / (1 << 15);
256 if (channel == channels) {
264 case AV_SAMPLE_FMT_S16P:
266 int16_t** p = reinterpret_cast<int16_t **> (_frame->data);
267 for (int i = 0; i < channels; ++i) {
268 for (int j = 0; j < frames; ++j) {
269 data[i][j] = static_cast<float>(p[i][j]) / (1 << 15);
275 case AV_SAMPLE_FMT_S32:
277 int32_t* p = reinterpret_cast<int32_t *> (_frame->data[0]);
280 for (int i = 0; i < total_samples; ++i) {
281 data[channel][sample] = static_cast<float>(*p++) / 2147483648;
284 if (channel == channels) {
292 case AV_SAMPLE_FMT_S32P:
294 int32_t** p = reinterpret_cast<int32_t **> (_frame->data);
295 for (int i = 0; i < channels; ++i) {
296 for (int j = 0; j < frames; ++j) {
297 data[i][j] = static_cast<float>(p[i][j]) / 2147483648;
303 case AV_SAMPLE_FMT_FLT:
305 float* p = reinterpret_cast<float*> (_frame->data[0]);
308 for (int i = 0; i < total_samples; ++i) {
309 data[channel][sample] = *p++;
312 if (channel == channels) {
320 case AV_SAMPLE_FMT_FLTP:
322 float** p = reinterpret_cast<float**> (_frame->data);
323 DCPOMATIC_ASSERT (_frame->channels <= channels);
324 /* Sometimes there aren't as many channels in the _frame as in the stream */
325 for (int i = 0; i < _frame->channels; ++i) {
326 memcpy (data[i], p[i], frames * sizeof(float));
328 for (int i = _frame->channels; i < channels; ++i) {
329 audio->make_silent (i);
335 throw DecodeError (String::compose (_("Unrecognised audio sample format (%1)"), static_cast<int> (audio_sample_format (stream))));
342 FFmpegDecoder::audio_sample_format (shared_ptr<FFmpegAudioStream> stream) const
344 DCPOMATIC_DISABLE_WARNINGS
345 return stream->stream (_format_context)->codec->sample_fmt;
346 DCPOMATIC_ENABLE_WARNINGS
350 FFmpegDecoder::bytes_per_audio_sample (shared_ptr<FFmpegAudioStream> stream) const
352 return av_get_bytes_per_sample (audio_sample_format (stream));
356 FFmpegDecoder::seek (ContentTime time, bool accurate)
358 Decoder::seek (time, accurate);
360 /* If we are doing an `accurate' seek, we need to use pre-roll, as
361 we don't really know what the seek will give us.
364 ContentTime pre_roll = accurate ? ContentTime::from_seconds (2) : ContentTime (0);
367 /* XXX: it seems debatable whether PTS should be used here...
368 http://www.mjbshaw.com/2012/04/seeking-in-ffmpeg-know-your-timestamp.html
371 optional<int> stream;
374 stream = _video_stream;
376 DCPOMATIC_ASSERT (_ffmpeg_content->audio);
377 shared_ptr<FFmpegAudioStream> s = dynamic_pointer_cast<FFmpegAudioStream> (_ffmpeg_content->audio->stream ());
379 stream = s->index (_format_context);
383 DCPOMATIC_ASSERT (stream);
385 ContentTime u = time - _pts_offset;
386 if (u < ContentTime ()) {
392 u.seconds() / av_q2d (_format_context->streams[stream.get()]->time_base),
397 /* Force re-creation of filter graphs to reset them and hence to make sure
398 they don't have any pre-seek frames knocking about.
400 boost::mutex::scoped_lock lm (_filter_graphs_mutex);
401 _filter_graphs.clear ();
404 if (video_codec_context ()) {
405 avcodec_flush_buffers (video_codec_context());
408 DCPOMATIC_DISABLE_WARNINGS
409 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, ffmpeg_content()->ffmpeg_audio_streams()) {
410 avcodec_flush_buffers (i->stream(_format_context)->codec);
412 DCPOMATIC_ENABLE_WARNINGS
414 if (subtitle_codec_context ()) {
415 avcodec_flush_buffers (subtitle_codec_context ());
418 _have_current_subtitle = false;
420 BOOST_FOREACH (optional<ContentTime>& i, _next_time) {
421 i = optional<ContentTime>();
426 FFmpegDecoder::decode_audio_packet ()
428 /* Audio packets can contain multiple frames, so we may have to call avcodec_decode_audio4
432 AVPacket copy_packet = _packet;
433 int const stream_index = copy_packet.stream_index;
435 /* XXX: inefficient */
436 vector<shared_ptr<FFmpegAudioStream> > streams = ffmpeg_content()->ffmpeg_audio_streams ();
437 vector<shared_ptr<FFmpegAudioStream> >::const_iterator stream = streams.begin ();
438 while (stream != streams.end () && !(*stream)->uses_index (_format_context, stream_index)) {
442 if (stream == streams.end ()) {
443 /* The packet's stream may not be an audio one; just ignore it in this method if so */
447 DCPOMATIC_DISABLE_WARNINGS
448 while (copy_packet.size > 0) {
451 int decode_result = avcodec_decode_audio4 ((*stream)->stream (_format_context)->codec, _frame, &frame_finished, ©_packet);
452 if (decode_result < 0) {
453 /* avcodec_decode_audio4 can sometimes return an error even though it has decoded
454 some valid data; for example dca_subframe_footer can return AVERROR_INVALIDDATA
455 if it overreads the auxiliary data. ffplay carries on if frame_finished is true,
456 even in the face of such an error, so I think we should too.
458 Returning from the method here caused mantis #352.
460 LOG_WARNING ("avcodec_decode_audio4 failed (%1)", decode_result);
462 /* Fudge decode_result so that we come out of the while loop when
463 we've processed this data.
465 decode_result = copy_packet.size;
468 if (frame_finished) {
469 shared_ptr<AudioBuffers> data = deinterleave_audio (*stream);
472 if (_frame->pts == AV_NOPTS_VALUE && _next_time[stream_index]) {
473 /* In some streams we see not every frame coming through with a timestamp; for those
474 that have AV_NOPTS_VALUE we need to work out the timestamp ourselves. This is
475 particularly noticeable with TrueHD streams (see #1111).
477 ct = *_next_time[stream_index];
479 ct = ContentTime::from_seconds (
480 av_frame_get_best_effort_timestamp (_frame) *
481 av_q2d ((*stream)->stream (_format_context)->time_base))
485 _next_time[stream_index] = ct + ContentTime::from_frames(data->frames(), (*stream)->frame_rate());
487 if (ct < ContentTime ()) {
488 /* Discard audio data that comes before time 0 */
489 Frame const remove = min (int64_t (data->frames()), (-ct).frames_ceil(double((*stream)->frame_rate ())));
490 data->move (data->frames() - remove, remove, 0);
491 data->set_frames (data->frames() - remove);
492 ct += ContentTime::from_frames (remove, (*stream)->frame_rate ());
495 if (ct < ContentTime()) {
497 "Crazy timestamp %1 for %2 samples in stream %3 packet pts %4 (ts=%5 tb=%6, off=%7)",
500 copy_packet.stream_index,
502 av_frame_get_best_effort_timestamp(_frame),
503 av_q2d((*stream)->stream(_format_context)->time_base),
504 to_string(_pts_offset)
507 DCPOMATIC_ENABLE_WARNINGS
509 /* Give this data provided there is some, and its time is sane */
510 if (ct >= ContentTime() && data->frames() > 0) {
511 audio->emit (film(), *stream, data, ct);
515 copy_packet.data += decode_result;
516 copy_packet.size -= decode_result;
521 FFmpegDecoder::decode_video_packet ()
523 DCPOMATIC_ASSERT (_video_stream);
526 DCPOMATIC_DISABLE_WARNINGS
527 if (avcodec_decode_video2 (video_codec_context(), _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
530 DCPOMATIC_ENABLE_WARNINGS
532 boost::mutex::scoped_lock lm (_filter_graphs_mutex);
534 shared_ptr<VideoFilterGraph> graph;
536 list<shared_ptr<VideoFilterGraph> >::iterator i = _filter_graphs.begin();
537 while (i != _filter_graphs.end() && !(*i)->can_process (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)) {
541 if (i == _filter_graphs.end ()) {
542 dcp::Fraction vfr (lrint(_ffmpeg_content->video_frame_rate().get() * 1000), 1000);
543 graph.reset (new VideoFilterGraph (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format, vfr));
544 graph->setup (_ffmpeg_content->filters ());
545 _filter_graphs.push_back (graph);
546 LOG_GENERAL (N_("New graph for %1x%2, pixel format %3"), _frame->width, _frame->height, _frame->format);
551 list<pair<shared_ptr<Image>, int64_t> > images = graph->process (_frame);
553 for (list<pair<shared_ptr<Image>, int64_t> >::iterator i = images.begin(); i != images.end(); ++i) {
555 shared_ptr<Image> image = i->first;
557 if (i->second != AV_NOPTS_VALUE) {
558 double const pts = i->second * av_q2d (_format_context->streams[_video_stream.get()]->time_base) + _pts_offset.seconds ();
562 shared_ptr<ImageProxy> (new RawImageProxy (image)),
563 llrint(pts * _ffmpeg_content->active_video_frame_rate(film()))
566 LOG_WARNING_NC ("Dropping frame without PTS");
574 FFmpegDecoder::decode_subtitle_packet ()
578 if (avcodec_decode_subtitle2 (subtitle_codec_context(), &sub, &got_subtitle, &_packet) < 0 || !got_subtitle) {
582 /* Stop any current subtitle, either at the time it was supposed to stop, or now if now is sooner */
583 if (_have_current_subtitle) {
584 if (_current_subtitle_to) {
585 only_text()->emit_stop (min(*_current_subtitle_to, subtitle_period(sub).from + _pts_offset));
587 only_text()->emit_stop (subtitle_period(sub).from + _pts_offset);
589 _have_current_subtitle = false;
592 if (sub.num_rects <= 0) {
593 /* Nothing new in this subtitle */
597 /* Subtitle PTS (within the source, not taking into account any of the
598 source that we may have chopped off for the DCP).
600 FFmpegSubtitlePeriod sub_period = subtitle_period (sub);
602 from = sub_period.from + _pts_offset;
604 _current_subtitle_to = *sub_period.to + _pts_offset;
606 _current_subtitle_to = optional<ContentTime>();
607 _have_current_subtitle = true;
610 for (unsigned int i = 0; i < sub.num_rects; ++i) {
611 AVSubtitleRect const * rect = sub.rects[i];
613 switch (rect->type) {
616 case SUBTITLE_BITMAP:
617 decode_bitmap_subtitle (rect, from);
620 cout << "XXX: SUBTITLE_TEXT " << rect->text << "\n";
623 decode_ass_subtitle (rect->ass, from);
628 if (_current_subtitle_to) {
629 only_text()->emit_stop (*_current_subtitle_to);
632 avsubtitle_free (&sub);
636 FFmpegDecoder::decode_bitmap_subtitle (AVSubtitleRect const * rect, ContentTime from)
638 /* Note BGRA is expressed little-endian, so the first byte in the word is B, second
639 G, third R, fourth A.
641 shared_ptr<Image> image (new Image (AV_PIX_FMT_BGRA, dcp::Size (rect->w, rect->h), true));
643 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
644 /* Start of the first line in the subtitle */
645 uint8_t* sub_p = rect->pict.data[0];
646 /* sub_p looks up into a BGRA palette which is at rect->pict.data[1];
647 (i.e. first byte B, second G, third R, fourth A)
649 uint8_t const * palette = rect->pict.data[1];
651 /* Start of the first line in the subtitle */
652 uint8_t* sub_p = rect->data[0];
653 /* sub_p looks up into a BGRA palette which is at rect->data[1].
654 (first byte B, second G, third R, fourth A)
656 uint8_t const * palette = rect->data[1];
658 /* And the stream has a map of those palette colours to colours
659 chosen by the user; created a `mapped' palette from those settings.
661 map<RGBA, RGBA> colour_map = ffmpeg_content()->subtitle_stream()->colours ();
662 vector<RGBA> mapped_palette (rect->nb_colors);
663 for (int i = 0; i < rect->nb_colors; ++i) {
664 RGBA c (palette[2], palette[1], palette[0], palette[3]);
665 map<RGBA, RGBA>::const_iterator j = colour_map.find (c);
666 if (j != colour_map.end ()) {
667 mapped_palette[i] = j->second;
669 /* This colour was not found in the FFmpegSubtitleStream's colour map; probably because
670 it is from a project that was created before this stuff was added. Just use the
671 colour straight from the original palette.
673 mapped_palette[i] = c;
678 /* Start of the output data */
679 uint8_t* out_p = image->data()[0];
681 for (int y = 0; y < rect->h; ++y) {
682 uint8_t* sub_line_p = sub_p;
683 uint8_t* out_line_p = out_p;
684 for (int x = 0; x < rect->w; ++x) {
685 RGBA const p = mapped_palette[*sub_line_p++];
691 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
692 sub_p += rect->pict.linesize[0];
694 sub_p += rect->linesize[0];
696 out_p += image->stride()[0];
699 int target_width = subtitle_codec_context()->width;
700 if (target_width == 0 && video_codec_context()) {
701 /* subtitle_codec_context()->width == 0 has been seen in the wild but I don't
702 know if it's supposed to mean something from FFmpeg's point of view.
704 target_width = video_codec_context()->width;
706 int target_height = subtitle_codec_context()->height;
707 if (target_height == 0 && video_codec_context()) {
708 target_height = video_codec_context()->height;
710 DCPOMATIC_ASSERT (target_width);
711 DCPOMATIC_ASSERT (target_height);
712 dcpomatic::Rect<double> const scaled_rect (
713 static_cast<double> (rect->x) / target_width,
714 static_cast<double> (rect->y) / target_height,
715 static_cast<double> (rect->w) / target_width,
716 static_cast<double> (rect->h) / target_height
719 only_text()->emit_bitmap_start (from, image, scaled_rect);
723 FFmpegDecoder::decode_ass_subtitle (string ass, ContentTime from)
725 /* We have no styles and no Format: line, so I'm assuming that FFmpeg
726 produces a single format of Dialogue: lines...
731 for (size_t i = 0; i < ass.length(); ++i) {
732 if (commas < 9 && ass[i] == ',') {
734 } else if (commas == 9) {
743 sub::RawSubtitle base;
744 list<sub::RawSubtitle> raw = sub::SSAReader::parse_line (
747 _ffmpeg_content->video->size().width,
748 _ffmpeg_content->video->size().height
751 BOOST_FOREACH (sub::Subtitle const & i, sub::collect<list<sub::Subtitle> > (raw)) {
752 only_text()->emit_plain_start (from, i);