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>
72 using boost::shared_ptr;
73 using boost::is_any_of;
75 using boost::optional;
76 using boost::dynamic_pointer_cast;
79 FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> film, shared_ptr<const FFmpegContent> c, bool fast)
82 , _have_current_subtitle (false)
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 int r = av_read_frame (_format_context, &_packet);
164 /* AVERROR_INVALIDDATA can apparently be returned sometimes even when av_read_frame
165 has pretty-much succeeded (and hence generated data which should be processed).
166 Hence it makes sense to continue here in that case.
168 if (r < 0 && r != AVERROR_INVALIDDATA) {
169 if (r != AVERROR_EOF) {
170 /* Maybe we should fail here, but for now we'll just finish off instead */
172 av_strerror (r, buf, sizeof(buf));
173 LOG_ERROR (N_("error on av_read_frame (%1) (%2)"), &buf[0], r);
180 int const si = _packet.stream_index;
181 shared_ptr<const FFmpegContent> fc = _ffmpeg_content;
183 if (_video_stream && si == _video_stream.get() && !video->ignore()) {
184 decode_video_packet ();
185 } else if (fc->subtitle_stream() && fc->subtitle_stream()->uses_index(_format_context, si) && !only_text()->ignore()) {
186 decode_subtitle_packet ();
188 decode_audio_packet ();
191 av_packet_unref (&_packet);
195 /** @param data pointer to array of pointers to buffers.
196 * Only the first buffer will be used for non-planar data, otherwise there will be one per channel.
198 shared_ptr<AudioBuffers>
199 FFmpegDecoder::deinterleave_audio (shared_ptr<FFmpegAudioStream> stream) const
201 DCPOMATIC_ASSERT (bytes_per_audio_sample (stream));
203 int const size = av_samples_get_buffer_size (
204 0, stream->stream(_format_context)->codec->channels, _frame->nb_samples, audio_sample_format (stream), 1
207 /* Deinterleave and convert to float */
209 /* total_samples and frames will be rounded down here, so if there are stray samples at the end
210 of the block that do not form a complete sample or frame they will be dropped.
212 int const total_samples = size / bytes_per_audio_sample (stream);
213 int const channels = stream->channels();
214 int const frames = total_samples / channels;
215 shared_ptr<AudioBuffers> audio (new AudioBuffers (channels, frames));
216 float** data = audio->data();
218 switch (audio_sample_format (stream)) {
219 case AV_SAMPLE_FMT_U8:
221 uint8_t* p = reinterpret_cast<uint8_t *> (_frame->data[0]);
224 for (int i = 0; i < total_samples; ++i) {
225 data[channel][sample] = float(*p++) / (1 << 23);
228 if (channel == channels) {
236 case AV_SAMPLE_FMT_S16:
238 int16_t* p = reinterpret_cast<int16_t *> (_frame->data[0]);
241 for (int i = 0; i < total_samples; ++i) {
242 data[channel][sample] = float(*p++) / (1 << 15);
245 if (channel == channels) {
253 case AV_SAMPLE_FMT_S16P:
255 int16_t** p = reinterpret_cast<int16_t **> (_frame->data);
256 for (int i = 0; i < channels; ++i) {
257 for (int j = 0; j < frames; ++j) {
258 data[i][j] = static_cast<float>(p[i][j]) / (1 << 15);
264 case AV_SAMPLE_FMT_S32:
266 int32_t* p = reinterpret_cast<int32_t *> (_frame->data[0]);
269 for (int i = 0; i < total_samples; ++i) {
270 data[channel][sample] = static_cast<float>(*p++) / 2147483648;
273 if (channel == channels) {
281 case AV_SAMPLE_FMT_S32P:
283 int32_t** p = reinterpret_cast<int32_t **> (_frame->data);
284 for (int i = 0; i < channels; ++i) {
285 for (int j = 0; j < frames; ++j) {
286 data[i][j] = static_cast<float>(p[i][j]) / 2147483648;
292 case AV_SAMPLE_FMT_FLT:
294 float* p = reinterpret_cast<float*> (_frame->data[0]);
297 for (int i = 0; i < total_samples; ++i) {
298 data[channel][sample] = *p++;
301 if (channel == channels) {
309 case AV_SAMPLE_FMT_FLTP:
311 float** p = reinterpret_cast<float**> (_frame->data);
312 /* Sometimes there aren't as many channels in the _frame as in the stream */
313 for (int i = 0; i < _frame->channels; ++i) {
314 memcpy (data[i], p[i], frames * sizeof(float));
316 for (int i = _frame->channels; i < channels; ++i) {
317 audio->make_silent (i);
323 throw DecodeError (String::compose (_("Unrecognised audio sample format (%1)"), static_cast<int> (audio_sample_format (stream))));
330 FFmpegDecoder::audio_sample_format (shared_ptr<FFmpegAudioStream> stream) const
332 return stream->stream (_format_context)->codec->sample_fmt;
336 FFmpegDecoder::bytes_per_audio_sample (shared_ptr<FFmpegAudioStream> stream) const
338 return av_get_bytes_per_sample (audio_sample_format (stream));
342 FFmpegDecoder::seek (ContentTime time, bool accurate)
344 Decoder::seek (time, accurate);
346 /* If we are doing an `accurate' seek, we need to use pre-roll, as
347 we don't really know what the seek will give us.
350 ContentTime pre_roll = accurate ? ContentTime::from_seconds (2) : ContentTime (0);
353 /* XXX: it seems debatable whether PTS should be used here...
354 http://www.mjbshaw.com/2012/04/seeking-in-ffmpeg-know-your-timestamp.html
357 optional<int> stream;
360 stream = _video_stream;
362 shared_ptr<FFmpegAudioStream> s = dynamic_pointer_cast<FFmpegAudioStream> (_ffmpeg_content->audio->stream ());
364 stream = s->index (_format_context);
368 DCPOMATIC_ASSERT (stream);
370 ContentTime u = time - _pts_offset;
371 if (u < ContentTime ()) {
377 u.seconds() / av_q2d (_format_context->streams[stream.get()]->time_base),
382 /* Force re-creation of filter graphs to reset them and hence to make sure
383 they don't have any pre-seek frames knocking about.
385 boost::mutex::scoped_lock lm (_filter_graphs_mutex);
386 _filter_graphs.clear ();
389 if (video_codec_context ()) {
390 avcodec_flush_buffers (video_codec_context());
393 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, ffmpeg_content()->ffmpeg_audio_streams()) {
394 avcodec_flush_buffers (i->stream(_format_context)->codec);
397 if (subtitle_codec_context ()) {
398 avcodec_flush_buffers (subtitle_codec_context ());
401 _have_current_subtitle = false;
403 BOOST_FOREACH (optional<ContentTime>& i, _next_time) {
404 i = optional<ContentTime>();
409 FFmpegDecoder::decode_audio_packet ()
411 /* Audio packets can contain multiple frames, so we may have to call avcodec_decode_audio4
415 AVPacket copy_packet = _packet;
416 int const stream_index = copy_packet.stream_index;
418 /* XXX: inefficient */
419 vector<shared_ptr<FFmpegAudioStream> > streams = ffmpeg_content()->ffmpeg_audio_streams ();
420 vector<shared_ptr<FFmpegAudioStream> >::const_iterator stream = streams.begin ();
421 while (stream != streams.end () && !(*stream)->uses_index (_format_context, stream_index)) {
425 if (stream == streams.end ()) {
426 /* The packet's stream may not be an audio one; just ignore it in this method if so */
430 while (copy_packet.size > 0) {
433 int decode_result = avcodec_decode_audio4 ((*stream)->stream (_format_context)->codec, _frame, &frame_finished, ©_packet);
434 if (decode_result < 0) {
435 /* avcodec_decode_audio4 can sometimes return an error even though it has decoded
436 some valid data; for example dca_subframe_footer can return AVERROR_INVALIDDATA
437 if it overreads the auxiliary data. ffplay carries on if frame_finished is true,
438 even in the face of such an error, so I think we should too.
440 Returning from the method here caused mantis #352.
442 LOG_WARNING ("avcodec_decode_audio4 failed (%1)", decode_result);
444 /* Fudge decode_result so that we come out of the while loop when
445 we've processed this data.
447 decode_result = copy_packet.size;
450 if (frame_finished) {
451 shared_ptr<AudioBuffers> data = deinterleave_audio (*stream);
454 if (_frame->pts == AV_NOPTS_VALUE && _next_time[stream_index]) {
455 /* In some streams we see not every frame coming through with a timestamp; for those
456 that have AV_NOPTS_VALUE we need to work out the timestamp ourselves. This is
457 particularly noticeable with TrueHD streams (see #1111).
459 ct = *_next_time[stream_index];
461 ct = ContentTime::from_seconds (
462 av_frame_get_best_effort_timestamp (_frame) *
463 av_q2d ((*stream)->stream (_format_context)->time_base))
467 _next_time[stream_index] = ct + ContentTime::from_frames(data->frames(), (*stream)->frame_rate());
469 if (ct < ContentTime ()) {
470 /* Discard audio data that comes before time 0 */
471 Frame const remove = min (int64_t (data->frames()), (-ct).frames_ceil(double((*stream)->frame_rate ())));
472 data->move (data->frames() - remove, remove, 0);
473 data->set_frames (data->frames() - remove);
474 ct += ContentTime::from_frames (remove, (*stream)->frame_rate ());
477 if (ct < ContentTime()) {
479 "Crazy timestamp %1 for %2 samples in stream %3 packet pts %4 (ts=%5 tb=%6, off=%7)",
482 copy_packet.stream_index,
484 av_frame_get_best_effort_timestamp(_frame),
485 av_q2d((*stream)->stream(_format_context)->time_base),
486 to_string(_pts_offset)
490 /* Give this data provided there is some, and its time is sane */
491 if (ct >= ContentTime() && data->frames() > 0) {
492 audio->emit (film(), *stream, data, ct);
496 copy_packet.data += decode_result;
497 copy_packet.size -= decode_result;
502 FFmpegDecoder::decode_video_packet ()
504 DCPOMATIC_ASSERT (_video_stream);
507 if (avcodec_decode_video2 (video_codec_context(), _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
511 boost::mutex::scoped_lock lm (_filter_graphs_mutex);
513 shared_ptr<VideoFilterGraph> graph;
515 list<shared_ptr<VideoFilterGraph> >::iterator i = _filter_graphs.begin();
516 while (i != _filter_graphs.end() && !(*i)->can_process (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)) {
520 if (i == _filter_graphs.end ()) {
521 dcp::Fraction vfr (lrint(_ffmpeg_content->video_frame_rate().get() * 1000), 1000);
522 graph.reset (new VideoFilterGraph (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format, vfr));
523 graph->setup (_ffmpeg_content->filters ());
524 _filter_graphs.push_back (graph);
525 LOG_GENERAL (N_("New graph for %1x%2, pixel format %3"), _frame->width, _frame->height, _frame->format);
530 list<pair<shared_ptr<Image>, int64_t> > images = graph->process (_frame);
532 for (list<pair<shared_ptr<Image>, int64_t> >::iterator i = images.begin(); i != images.end(); ++i) {
534 shared_ptr<Image> image = i->first;
536 if (i->second != AV_NOPTS_VALUE) {
537 double const pts = i->second * av_q2d (_format_context->streams[_video_stream.get()]->time_base) + _pts_offset.seconds ();
541 shared_ptr<ImageProxy> (new RawImageProxy (image)),
542 llrint(pts * _ffmpeg_content->active_video_frame_rate(film()))
545 LOG_WARNING_NC ("Dropping frame without PTS");
553 FFmpegDecoder::decode_subtitle_packet ()
557 if (avcodec_decode_subtitle2 (subtitle_codec_context(), &sub, &got_subtitle, &_packet) < 0 || !got_subtitle) {
561 /* Stop any current subtitle, either at the time it was supposed to stop, or now if now is sooner */
562 if (_have_current_subtitle) {
563 if (_current_subtitle_to) {
564 only_text()->emit_stop (min(*_current_subtitle_to, subtitle_period(sub).from + _pts_offset));
566 only_text()->emit_stop (subtitle_period(sub).from + _pts_offset);
568 _have_current_subtitle = false;
571 if (sub.num_rects <= 0) {
572 /* Nothing new in this subtitle */
576 /* Subtitle PTS (within the source, not taking into account any of the
577 source that we may have chopped off for the DCP).
579 FFmpegSubtitlePeriod sub_period = subtitle_period (sub);
581 from = sub_period.from + _pts_offset;
583 _current_subtitle_to = *sub_period.to + _pts_offset;
585 _current_subtitle_to = optional<ContentTime>();
586 _have_current_subtitle = true;
589 for (unsigned int i = 0; i < sub.num_rects; ++i) {
590 AVSubtitleRect const * rect = sub.rects[i];
592 switch (rect->type) {
595 case SUBTITLE_BITMAP:
596 decode_bitmap_subtitle (rect, from);
599 cout << "XXX: SUBTITLE_TEXT " << rect->text << "\n";
602 decode_ass_subtitle (rect->ass, from);
607 if (_current_subtitle_to) {
608 only_text()->emit_stop (*_current_subtitle_to);
611 avsubtitle_free (&sub);
615 FFmpegDecoder::decode_bitmap_subtitle (AVSubtitleRect const * rect, ContentTime from)
617 /* Note BGRA is expressed little-endian, so the first byte in the word is B, second
618 G, third R, fourth A.
620 shared_ptr<Image> image (new Image (AV_PIX_FMT_BGRA, dcp::Size (rect->w, rect->h), true));
622 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
623 /* Start of the first line in the subtitle */
624 uint8_t* sub_p = rect->pict.data[0];
625 /* sub_p looks up into a BGRA palette which is here
626 (i.e. first byte B, second G, third R, fourth A)
628 uint32_t const * palette = (uint32_t *) rect->pict.data[1];
630 /* Start of the first line in the subtitle */
631 uint8_t* sub_p = rect->data[0];
632 /* sub_p looks up into a BGRA palette which is at rect->data[1].
633 (first byte B, second G, third R, fourth A)
636 /* And the stream has a map of those palette colours to colours
637 chosen by the user; created a `mapped' palette from those settings.
639 map<RGBA, RGBA> colour_map = ffmpeg_content()->subtitle_stream()->colours ();
640 vector<RGBA> mapped_palette (rect->nb_colors);
641 uint8_t const * palette = rect->data[1];
642 for (int i = 0; i < rect->nb_colors; ++i) {
643 RGBA c (palette[2], palette[1], palette[0], palette[3]);
644 map<RGBA, RGBA>::const_iterator j = colour_map.find (c);
645 if (j != colour_map.end ()) {
646 mapped_palette[i] = j->second;
648 /* This colour was not found in the FFmpegSubtitleStream's colour map; probably because
649 it is from a project that was created before this stuff was added. Just use the
650 colour straight from the original palette.
652 mapped_palette[i] = c;
657 /* Start of the output data */
658 uint8_t* out_p = image->data()[0];
660 for (int y = 0; y < rect->h; ++y) {
661 uint8_t* sub_line_p = sub_p;
662 uint8_t* out_line_p = out_p;
663 for (int x = 0; x < rect->w; ++x) {
664 RGBA const p = mapped_palette[*sub_line_p++];
670 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
671 sub_p += rect->pict.linesize[0];
673 sub_p += rect->linesize[0];
675 out_p += image->stride()[0];
678 int target_width = subtitle_codec_context()->width;
679 if (target_width == 0 && video_codec_context()) {
680 /* subtitle_codec_context()->width == 0 has been seen in the wild but I don't
681 know if it's supposed to mean something from FFmpeg's point of view.
683 target_width = video_codec_context()->width;
685 int target_height = subtitle_codec_context()->height;
686 if (target_height == 0 && video_codec_context()) {
687 target_height = video_codec_context()->height;
689 DCPOMATIC_ASSERT (target_width);
690 DCPOMATIC_ASSERT (target_height);
691 dcpomatic::Rect<double> const scaled_rect (
692 static_cast<double> (rect->x) / target_width,
693 static_cast<double> (rect->y) / target_height,
694 static_cast<double> (rect->w) / target_width,
695 static_cast<double> (rect->h) / target_height
698 only_text()->emit_bitmap_start (from, image, scaled_rect);
702 FFmpegDecoder::decode_ass_subtitle (string ass, ContentTime from)
704 /* We have no styles and no Format: line, so I'm assuming that FFmpeg
705 produces a single format of Dialogue: lines...
710 for (size_t i = 0; i < ass.length(); ++i) {
711 if (commas < 9 && ass[i] == ',') {
713 } else if (commas == 9) {
722 sub::RawSubtitle base;
723 list<sub::RawSubtitle> raw = sub::SSAReader::parse_line (
726 _ffmpeg_content->video->size().width,
727 _ffmpeg_content->video->size().height
730 BOOST_FOREACH (sub::Subtitle const & i, sub::collect<list<sub::Subtitle> > (raw)) {
731 only_text()->emit_plain_start (from, i);