2 Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/ffmpeg_decoder.cc
21 * @brief A decoder using FFmpeg to decode content.
25 #include "exceptions.h"
29 #include "ffmpeg_decoder.h"
30 #include "ffmpeg_audio_stream.h"
31 #include "ffmpeg_subtitle_stream.h"
32 #include "video_filter_graph.h"
33 #include "audio_buffers.h"
34 #include "ffmpeg_content.h"
35 #include "raw_image_proxy.h"
37 #include "md5_digester.h"
38 #include "compose.hpp"
39 #include <dcp/subtitle_string.h>
40 #include <sub/ssa_reader.h>
41 #include <sub/subtitle.h>
42 #include <sub/collect.h>
44 #include <libavcodec/avcodec.h>
45 #include <libavformat/avformat.h>
47 #include <boost/foreach.hpp>
48 #include <boost/algorithm/string.hpp>
56 #define LOG_GENERAL(...) _log->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
57 #define LOG_ERROR(...) _log->log (String::compose (__VA_ARGS__), LogEntry::TYPE_ERROR);
58 #define LOG_WARNING_NC(...) _log->log (__VA_ARGS__, LogEntry::TYPE_WARNING);
59 #define LOG_WARNING(...) _log->log (String::compose (__VA_ARGS__), LogEntry::TYPE_WARNING);
68 using boost::shared_ptr;
69 using boost::is_any_of;
73 FFmpegDecoder::FFmpegDecoder (shared_ptr<const FFmpegContent> c, shared_ptr<Log> log, bool fast)
75 , AudioDecoder (c, fast)
79 , _pts_offset (pts_offset (c->ffmpeg_audio_streams(), c->first_video(), c->video_frame_rate()))
85 FFmpegDecoder::flush ()
87 /* Get any remaining frames */
92 /* XXX: should we reset _packet.data and size after each *_decode_* call? */
94 while (decode_video_packet ()) {}
96 decode_audio_packet ();
97 AudioDecoder::flush ();
101 FFmpegDecoder::pass (PassReason reason, bool accurate)
103 int r = av_read_frame (_format_context, &_packet);
105 /* AVERROR_INVALIDDATA can apparently be returned sometimes even when av_read_frame
106 has pretty-much succeeded (and hence generated data which should be processed).
107 Hence it makes sense to continue here in that case.
109 if (r < 0 && r != AVERROR_INVALIDDATA) {
110 if (r != AVERROR_EOF) {
111 /* Maybe we should fail here, but for now we'll just finish off instead */
113 av_strerror (r, buf, sizeof(buf));
114 LOG_ERROR (N_("error on av_read_frame (%1) (%2)"), buf, r);
121 int const si = _packet.stream_index;
122 shared_ptr<const FFmpegContent> fc = _ffmpeg_content;
124 if (si == _video_stream && !_ignore_video && (accurate || reason != PASS_REASON_SUBTITLE)) {
125 decode_video_packet ();
126 } else if (fc->subtitle_stream() && fc->subtitle_stream()->uses_index (_format_context, si)) {
127 decode_subtitle_packet ();
128 } else if (accurate || reason != PASS_REASON_SUBTITLE) {
129 decode_audio_packet ();
132 av_free_packet (&_packet);
136 /** @param data pointer to array of pointers to buffers.
137 * Only the first buffer will be used for non-planar data, otherwise there will be one per channel.
139 shared_ptr<AudioBuffers>
140 FFmpegDecoder::deinterleave_audio (shared_ptr<FFmpegAudioStream> stream) const
142 DCPOMATIC_ASSERT (bytes_per_audio_sample (stream));
144 int const size = av_samples_get_buffer_size (
145 0, stream->stream(_format_context)->codec->channels, _frame->nb_samples, audio_sample_format (stream), 1
148 /* Deinterleave and convert to float */
150 /* total_samples and frames will be rounded down here, so if there are stray samples at the end
151 of the block that do not form a complete sample or frame they will be dropped.
153 int const total_samples = size / bytes_per_audio_sample (stream);
154 int const frames = total_samples / stream->channels();
155 shared_ptr<AudioBuffers> audio (new AudioBuffers (stream->channels(), frames));
157 switch (audio_sample_format (stream)) {
158 case AV_SAMPLE_FMT_U8:
160 uint8_t* p = reinterpret_cast<uint8_t *> (_frame->data[0]);
163 for (int i = 0; i < total_samples; ++i) {
164 audio->data(channel)[sample] = float(*p++) / (1 << 23);
167 if (channel == stream->channels()) {
175 case AV_SAMPLE_FMT_S16:
177 int16_t* p = reinterpret_cast<int16_t *> (_frame->data[0]);
180 for (int i = 0; i < total_samples; ++i) {
181 audio->data(channel)[sample] = float(*p++) / (1 << 15);
184 if (channel == stream->channels()) {
192 case AV_SAMPLE_FMT_S16P:
194 int16_t** p = reinterpret_cast<int16_t **> (_frame->data);
195 for (int i = 0; i < stream->channels(); ++i) {
196 for (int j = 0; j < frames; ++j) {
197 audio->data(i)[j] = static_cast<float>(p[i][j]) / (1 << 15);
203 case AV_SAMPLE_FMT_S32:
205 int32_t* p = reinterpret_cast<int32_t *> (_frame->data[0]);
208 for (int i = 0; i < total_samples; ++i) {
209 audio->data(channel)[sample] = static_cast<float>(*p++) / (1 << 31);
212 if (channel == stream->channels()) {
220 case AV_SAMPLE_FMT_FLT:
222 float* p = reinterpret_cast<float*> (_frame->data[0]);
225 for (int i = 0; i < total_samples; ++i) {
226 audio->data(channel)[sample] = *p++;
229 if (channel == stream->channels()) {
237 case AV_SAMPLE_FMT_FLTP:
239 float** p = reinterpret_cast<float**> (_frame->data);
240 /* Sometimes there aren't as many channels in the _frame as in the stream */
241 for (int i = 0; i < _frame->channels; ++i) {
242 memcpy (audio->data(i), p[i], frames * sizeof(float));
244 for (int i = _frame->channels; i < stream->channels(); ++i) {
245 audio->make_silent (i);
251 throw DecodeError (String::compose (_("Unrecognised audio sample format (%1)"), static_cast<int> (audio_sample_format (stream))));
258 FFmpegDecoder::audio_sample_format (shared_ptr<FFmpegAudioStream> stream) const
260 return stream->stream (_format_context)->codec->sample_fmt;
264 FFmpegDecoder::bytes_per_audio_sample (shared_ptr<FFmpegAudioStream> stream) const
266 return av_get_bytes_per_sample (audio_sample_format (stream));
270 FFmpegDecoder::seek (ContentTime time, bool accurate)
272 VideoDecoder::seek (time, accurate);
273 AudioDecoder::seek (time, accurate);
274 SubtitleDecoder::seek (time, accurate);
276 /* If we are doing an `accurate' seek, we need to use pre-roll, as
277 we don't really know what the seek will give us.
280 ContentTime pre_roll = accurate ? ContentTime::from_seconds (2) : ContentTime (0);
283 /* XXX: it seems debatable whether PTS should be used here...
284 http://www.mjbshaw.com/2012/04/seeking-in-ffmpeg-know-your-timestamp.html
287 ContentTime u = time - _pts_offset;
288 if (u < ContentTime ()) {
291 av_seek_frame (_format_context, _video_stream, u.seconds() / av_q2d (_format_context->streams[_video_stream]->time_base), AVSEEK_FLAG_BACKWARD);
293 avcodec_flush_buffers (video_codec_context());
295 /* XXX: should be flushing audio buffers? */
297 if (subtitle_codec_context ()) {
298 avcodec_flush_buffers (subtitle_codec_context ());
303 FFmpegDecoder::decode_audio_packet ()
305 /* Audio packets can contain multiple frames, so we may have to call avcodec_decode_audio4
309 AVPacket copy_packet = _packet;
311 /* XXX: inefficient */
312 vector<shared_ptr<FFmpegAudioStream> > streams = ffmpeg_content()->ffmpeg_audio_streams ();
313 vector<shared_ptr<FFmpegAudioStream> >::const_iterator stream = streams.begin ();
314 while (stream != streams.end () && !(*stream)->uses_index (_format_context, copy_packet.stream_index)) {
318 if (stream == streams.end ()) {
319 /* The packet's stream may not be an audio one; just ignore it in this method if so */
323 while (copy_packet.size > 0) {
326 int decode_result = avcodec_decode_audio4 ((*stream)->stream (_format_context)->codec, _frame, &frame_finished, ©_packet);
327 if (decode_result < 0) {
328 /* avcodec_decode_audio4 can sometimes return an error even though it has decoded
329 some valid data; for example dca_subframe_footer can return AVERROR_INVALIDDATA
330 if it overreads the auxiliary data. ffplay carries on if frame_finished is true,
331 even in the face of such an error, so I think we should too.
333 Returning from the method here caused mantis #352.
335 LOG_WARNING ("avcodec_decode_audio4 failed (%1)", decode_result);
337 /* Fudge decode_result so that we come out of the while loop when
338 we've processed this data.
340 decode_result = copy_packet.size;
343 if (frame_finished) {
344 ContentTime ct = ContentTime::from_seconds (
345 av_frame_get_best_effort_timestamp (_frame) *
346 av_q2d ((*stream)->stream (_format_context)->time_base))
349 shared_ptr<AudioBuffers> data = deinterleave_audio (*stream);
351 if (ct < ContentTime ()) {
352 /* Discard audio data that comes before time 0 */
353 Frame const remove = min (int64_t (data->frames()), (-ct).frames_ceil(double((*stream)->frame_rate ())));
354 data->move (remove, 0, data->frames() - remove);
355 data->set_frames (data->frames() - remove);
356 ct += ContentTime::from_frames (remove, (*stream)->frame_rate ());
359 if (data->frames() > 0) {
360 audio (*stream, data, ct);
364 copy_packet.data += decode_result;
365 copy_packet.size -= decode_result;
370 FFmpegDecoder::decode_video_packet ()
373 if (avcodec_decode_video2 (video_codec_context(), _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
377 boost::mutex::scoped_lock lm (_filter_graphs_mutex);
379 shared_ptr<VideoFilterGraph> graph;
381 list<shared_ptr<VideoFilterGraph> >::iterator i = _filter_graphs.begin();
382 while (i != _filter_graphs.end() && !(*i)->can_process (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)) {
386 if (i == _filter_graphs.end ()) {
387 graph.reset (new VideoFilterGraph (dcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format));
388 graph->setup (_ffmpeg_content->filters ());
389 _filter_graphs.push_back (graph);
390 LOG_GENERAL (N_("New graph for %1x%2, pixel format %3"), _frame->width, _frame->height, _frame->format);
395 list<pair<shared_ptr<Image>, int64_t> > images = graph->process (_frame);
397 for (list<pair<shared_ptr<Image>, int64_t> >::iterator i = images.begin(); i != images.end(); ++i) {
399 shared_ptr<Image> image = i->first;
401 if (i->second != AV_NOPTS_VALUE) {
402 double const pts = i->second * av_q2d (_format_context->streams[_video_stream]->time_base) + _pts_offset.seconds ();
404 shared_ptr<ImageProxy> (new RawImageProxy (image)),
405 llrint (pts * _ffmpeg_content->video_frame_rate ())
408 LOG_WARNING_NC ("Dropping frame without PTS");
416 FFmpegDecoder::decode_subtitle_packet ()
420 if (avcodec_decode_subtitle2 (subtitle_codec_context(), &sub, &got_subtitle, &_packet) < 0 || !got_subtitle) {
424 if (sub.num_rects <= 0) {
425 /* Sometimes we get an empty AVSubtitle, which is used by some codecs to
426 indicate that the previous subtitle should stop. We can ignore it here.
431 /* Subtitle PTS (within the source, not taking into account any of the
432 source that we may have chopped off for the DCP).
434 FFmpegSubtitlePeriod sub_period = subtitle_period (sub);
435 ContentTimePeriod period;
436 period.from = sub_period.from + _pts_offset;
438 /* We already know the subtitle period `to' time */
439 period.to = sub_period.to.get() + _pts_offset;
441 /* We have to look up the `to' time in the stream's records */
442 period.to = ffmpeg_content()->subtitle_stream()->find_subtitle_to (subtitle_id (sub));
445 for (unsigned int i = 0; i < sub.num_rects; ++i) {
446 AVSubtitleRect const * rect = sub.rects[i];
448 switch (rect->type) {
451 case SUBTITLE_BITMAP:
452 decode_bitmap_subtitle (rect, period);
455 cout << "XXX: SUBTITLE_TEXT " << rect->text << "\n";
458 decode_ass_subtitle (rect->ass, period);
463 avsubtitle_free (&sub);
466 list<ContentTimePeriod>
467 FFmpegDecoder::image_subtitles_during (ContentTimePeriod p, bool starting) const
469 return _ffmpeg_content->image_subtitles_during (p, starting);
472 list<ContentTimePeriod>
473 FFmpegDecoder::text_subtitles_during (ContentTimePeriod p, bool starting) const
475 return _ffmpeg_content->text_subtitles_during (p, starting);
479 FFmpegDecoder::decode_bitmap_subtitle (AVSubtitleRect const * rect, ContentTimePeriod period)
481 /* Note RGBA is expressed little-endian, so the first byte in the word is R, second
482 G, third B, fourth A.
484 shared_ptr<Image> image (new Image (AV_PIX_FMT_RGBA, dcp::Size (rect->w, rect->h), true));
486 /* Start of the first line in the subtitle */
487 uint8_t* sub_p = rect->pict.data[0];
488 /* sub_p looks up into a BGRA palette which is here
489 (i.e. first byte B, second G, third R, fourth A)
491 uint32_t const * palette = (uint32_t *) rect->pict.data[1];
492 /* Start of the output data */
493 uint32_t* out_p = (uint32_t *) image->data()[0];
495 for (int y = 0; y < rect->h; ++y) {
496 uint8_t* sub_line_p = sub_p;
497 uint32_t* out_line_p = out_p;
498 for (int x = 0; x < rect->w; ++x) {
499 uint32_t const p = palette[*sub_line_p++];
500 *out_line_p++ = ((p & 0xff) << 16) | (p & 0xff00) | ((p & 0xff0000) >> 16) | (p & 0xff000000);
502 sub_p += rect->pict.linesize[0];
503 out_p += image->stride()[0] / sizeof (uint32_t);
506 dcp::Size const vs = _ffmpeg_content->video_size ();
507 dcpomatic::Rect<double> const scaled_rect (
508 static_cast<double> (rect->x) / vs.width,
509 static_cast<double> (rect->y) / vs.height,
510 static_cast<double> (rect->w) / vs.width,
511 static_cast<double> (rect->h) / vs.height
514 image_subtitle (period, image, scaled_rect);
518 FFmpegDecoder::decode_ass_subtitle (string ass, ContentTimePeriod period)
520 /* We have no styles and no Format: line, so I'm assuming that FFmpeg
521 produces a single format of Dialogue: lines...
525 split (bits, ass, is_any_of (","));
526 if (bits.size() < 10) {
530 sub::RawSubtitle base;
531 list<sub::RawSubtitle> raw = sub::SSAReader::parse_line (base, bits[9]);
532 list<sub::Subtitle> subs = sub::collect<list<sub::Subtitle> > (raw);
534 /* XXX: lots of this is copied from TextSubtitle; there should probably be some sharing */
536 /* Highest line index in this subtitle */
538 BOOST_FOREACH (sub::Subtitle i, subs) {
539 BOOST_FOREACH (sub::Line j, i.lines) {
540 DCPOMATIC_ASSERT (j.vertical_position.reference && j.vertical_position.reference.get() == sub::TOP_OF_SUBTITLE);
541 DCPOMATIC_ASSERT (j.vertical_position.line);
542 highest = max (highest, j.vertical_position.line.get());
546 list<dcp::SubtitleString> ss;
548 BOOST_FOREACH (sub::Subtitle i, sub::collect<list<sub::Subtitle> > (sub::SSAReader::parse_line (base, bits[9]))) {
549 BOOST_FOREACH (sub::Line j, i.lines) {
550 BOOST_FOREACH (sub::Block k, j.blocks) {
552 dcp::SubtitleString (
553 boost::optional<string> (),
555 dcp::Colour (255, 255, 255),
556 /* 48pt is 1/22nd of the screen height */
559 dcp::Time (i.from.seconds(), 1000),
560 dcp::Time (i.to.seconds(), 1000),
563 /* This 1.015 is an arbitrary value to lift the bottom sub off the bottom
564 of the screen a bit to a pleasing degree.
566 1.015 - ((1 + highest - j.vertical_position.line.get()) * 1.5 / 22),
569 static_cast<dcp::Effect> (0),
570 dcp::Colour (255, 255, 255),
579 text_subtitle (period, ss);