2 Copyright (C) 2013-2015 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 <libavcodec/avcodec.h>
23 #include <libavformat/avformat.h>
24 #include <libavutil/pixfmt.h>
25 #include <libavutil/pixdesc.h>
27 #include "ffmpeg_examiner.h"
28 #include "ffmpeg_content.h"
30 #include "ffmpeg_audio_stream.h"
31 #include "ffmpeg_subtitle_stream.h"
33 #include <boost/foreach.hpp>
41 using boost::shared_ptr;
42 using boost::optional;
44 /** @param job job that the examiner is operating in, or 0 */
45 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
48 , _need_video_length (false)
50 /* Find audio and subtitle streams */
52 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
53 AVStream* s = _format_context->streams[i];
54 if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
56 /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
57 so bodge it here. No idea why we should have to do this.
60 if (s->codec->channel_layout == 0) {
61 s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
64 DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
65 DCPOMATIC_ASSERT (s->codec->codec);
66 DCPOMATIC_ASSERT (s->codec->codec->name);
68 _audio_streams.push_back (
69 shared_ptr<FFmpegAudioStream> (
70 new FFmpegAudioStream (
72 s->codec->codec->name,
74 s->codec->sample_rate,
75 (double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate,
81 } else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
82 _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (subtitle_stream_name (s), s->id)));
87 /* See if the header has duration information in it */
88 _need_video_length = _format_context->duration == AV_NOPTS_VALUE;
89 if (!_need_video_length) {
90 _video_length = (double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate().get ();
95 if (_need_video_length) {
96 job->sub (_("Finding length and subtitles"));
97 } else if (!_subtitle_streams.empty()) {
98 job->sub (_("Finding subtitles"));
100 job->sub (_("Finding length"));
104 /* Run through until we find:
106 * - the first audio for each stream.
107 * - the subtitle periods for each stream.
109 * We have to note subtitle periods as otherwise we have no way of knowing
110 * where we should look for subtitles (video and audio are always present,
114 int64_t const len = _file_group.length ();
116 int r = av_read_frame (_format_context, &_packet);
123 job->set_progress (float (_format_context->pb->pos) / len);
125 job->set_progress_unknown ();
129 AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
131 if (_video_stream && _packet.stream_index == _video_stream.get()) {
132 video_packet (context);
135 bool got_all_audio = true;
137 for (size_t i = 0; i < _audio_streams.size(); ++i) {
138 if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
139 audio_packet (context, _audio_streams[i]);
141 if (!_audio_streams[i]->first_audio) {
142 got_all_audio = false;
146 for (size_t i = 0; i < _subtitle_streams.size(); ++i) {
147 if (_subtitle_streams[i]->uses_index (_format_context, _packet.stream_index)) {
148 subtitle_packet (context, _subtitle_streams[i]);
152 av_packet_unref (&_packet);
154 if (_first_video && got_all_audio && _subtitle_streams.empty ()) {
160 /* Finish off any hanging subtitles at the end */
161 for (LastSubtitleMap::const_iterator i = _last_subtitle_start.begin(); i != _last_subtitle_start.end(); ++i) {
163 if (i->second->image) {
164 i->first->add_image_subtitle (
168 ContentTime::from_frames (video_length(), video_frame_rate().get_value_or (24))
172 i->first->add_text_subtitle (
176 ContentTime::from_frames (video_length(), video_frame_rate().get_value_or (24))
183 /* We just added subtitles to our streams without taking the PTS offset into account;
184 this is because we might not know the PTS offset when the first subtitle is seen.
185 Now we know the PTS offset so we can apply it to those subtitles.
187 if (has_video() && video_frame_rate()) {
188 BOOST_FOREACH (shared_ptr<FFmpegSubtitleStream> i, _subtitle_streams) {
189 i->add_offset (pts_offset (_audio_streams, _first_video, video_frame_rate().get()));
195 FFmpegExaminer::video_packet (AVCodecContext* context)
197 DCPOMATIC_ASSERT (_video_stream);
199 if (_first_video && !_need_video_length) {
204 if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
206 _first_video = frame_time (_format_context->streams[_video_stream.get()]);
208 if (_need_video_length) {
209 _video_length = frame_time (
210 _format_context->streams[_video_stream.get()]
211 ).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
217 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
219 if (stream->first_audio) {
224 if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
225 stream->first_audio = frame_time (stream->stream (_format_context));
230 FFmpegExaminer::subtitle_packet (AVCodecContext* context, shared_ptr<FFmpegSubtitleStream> stream)
234 if (avcodec_decode_subtitle2 (context, &sub, &frame_finished, &_packet) >= 0 && frame_finished) {
235 string id = subtitle_id (sub);
236 FFmpegSubtitlePeriod const period = subtitle_period (sub);
237 bool const starts_image = subtitle_starts_image (sub);
239 /* Some streams (notably DVB streams) have subtitles which have a specified end time
240 but which are then stopped earlier than this by a zero-num_rect subtitle.
243 LastSubtitleMap::iterator last = _last_subtitle_start.find (stream);
244 if (sub.num_rects == 0 && last != _last_subtitle_start.end() && last->second) {
245 /* Set (or fix) the `to' time for the last subtitle */
246 stream->set_subtitle_to (last->second->id, period.from);
247 _last_subtitle_start[stream] = optional<SubtitleStart> ();
248 } else if (sub.num_rects > 0) {
249 /* Add a subtitle; if we don't know the `to' time we set it to the from time and fix it later */
251 stream->add_image_subtitle (id, ContentTimePeriod (period.from, period.to.get_value_or (period.from)));
253 stream->add_text_subtitle (id, ContentTimePeriod (period.from, period.to.get_value_or (period.from)));
256 _last_subtitle_start[stream] = SubtitleStart (id, starts_image, period.from);
259 for (unsigned int i = 0; i < sub.num_rects; ++i) {
260 if (sub.rects[i]->type == SUBTITLE_BITMAP) {
261 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
262 uint32_t* palette = (uint32_t *) sub.rects[i]->pict.data[1];
263 for (int j = 0; j < sub.rects[i]->nb_colors; ++j) {
265 (palette[j] & 0x00ff0000) >> 16,
266 (palette[j] & 0x0000ff00) >> 8,
267 (palette[j] & 0x000000ff) >> 0,
268 (palette[j] & 0xff000000) >> 24
271 stream->set_colour (rgba, rgba);
274 uint32_t* palette = (uint32_t *) sub.rects[i]->data[1];
275 for (int j = 0; j < sub.rects[i]->nb_colors; ++j) {
277 (palette[j] & 0x00ff0000) >> 16,
278 (palette[j] & 0x0000ff00) >> 8,
279 (palette[j] & 0x000000ff) >> 0,
280 (palette[j] & 0xff000000) >> 24
283 stream->set_colour (rgba, rgba);
289 avsubtitle_free (&sub);
293 optional<ContentTime>
294 FFmpegExaminer::frame_time (AVStream* s) const
296 optional<ContentTime> t;
298 int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
299 if (bet != AV_NOPTS_VALUE) {
300 t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
307 FFmpegExaminer::video_frame_rate () const
309 DCPOMATIC_ASSERT (_video_stream);
310 /* This use of r_frame_rate is debateable; there's a few different
311 * frame rates in the format context, but this one seems to be the most
314 return av_q2d (av_stream_get_r_frame_rate (_format_context->streams[_video_stream.get()]));
318 FFmpegExaminer::video_size () const
320 return dcp::Size (video_codec_context()->width, video_codec_context()->height);
323 /** @return Length according to our content's header */
325 FFmpegExaminer::video_length () const
327 return max (Frame (1), _video_length);
331 FFmpegExaminer::sample_aspect_ratio () const
333 DCPOMATIC_ASSERT (_video_stream);
334 AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
336 /* I assume this means that we don't know */
337 return optional<double> ();
339 return double (sar.num) / sar.den;
343 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
345 string n = stream_name (s);
355 FFmpegExaminer::stream_name (AVStream* s) const
360 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
365 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
378 FFmpegExaminer::bits_per_pixel () const
380 if (video_codec_context()->pix_fmt == -1) {
381 throw DecodeError (_("Could not find pixel format for video."));
384 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
385 DCPOMATIC_ASSERT (d);
386 return av_get_bits_per_pixel (d);
390 FFmpegExaminer::yuv () const
392 switch (video_codec_context()->pix_fmt) {
393 case AV_PIX_FMT_YUV420P:
394 case AV_PIX_FMT_YUYV422:
395 case AV_PIX_FMT_YUV422P:
396 case AV_PIX_FMT_YUV444P:
397 case AV_PIX_FMT_YUV410P:
398 case AV_PIX_FMT_YUV411P:
399 case AV_PIX_FMT_YUVJ420P:
400 case AV_PIX_FMT_YUVJ422P:
401 case AV_PIX_FMT_YUVJ444P:
402 case AV_PIX_FMT_UYVY422:
403 case AV_PIX_FMT_UYYVYY411:
404 case AV_PIX_FMT_NV12:
405 case AV_PIX_FMT_NV21:
406 case AV_PIX_FMT_YUV440P:
407 case AV_PIX_FMT_YUVJ440P:
408 case AV_PIX_FMT_YUVA420P:
409 case AV_PIX_FMT_YUV420P16LE:
410 case AV_PIX_FMT_YUV420P16BE:
411 case AV_PIX_FMT_YUV422P16LE:
412 case AV_PIX_FMT_YUV422P16BE:
413 case AV_PIX_FMT_YUV444P16LE:
414 case AV_PIX_FMT_YUV444P16BE:
415 case AV_PIX_FMT_YUV420P9BE:
416 case AV_PIX_FMT_YUV420P9LE:
417 case AV_PIX_FMT_YUV420P10BE:
418 case AV_PIX_FMT_YUV420P10LE:
419 case AV_PIX_FMT_YUV422P10BE:
420 case AV_PIX_FMT_YUV422P10LE:
421 case AV_PIX_FMT_YUV444P9BE:
422 case AV_PIX_FMT_YUV444P9LE:
423 case AV_PIX_FMT_YUV444P10BE:
424 case AV_PIX_FMT_YUV444P10LE:
425 case AV_PIX_FMT_YUV422P9BE:
426 case AV_PIX_FMT_YUV422P9LE:
427 case AV_PIX_FMT_YUVA420P9BE:
428 case AV_PIX_FMT_YUVA420P9LE:
429 case AV_PIX_FMT_YUVA422P9BE:
430 case AV_PIX_FMT_YUVA422P9LE:
431 case AV_PIX_FMT_YUVA444P9BE:
432 case AV_PIX_FMT_YUVA444P9LE:
433 case AV_PIX_FMT_YUVA420P10BE:
434 case AV_PIX_FMT_YUVA420P10LE:
435 case AV_PIX_FMT_YUVA422P10BE:
436 case AV_PIX_FMT_YUVA422P10LE:
437 case AV_PIX_FMT_YUVA444P10BE:
438 case AV_PIX_FMT_YUVA444P10LE:
439 case AV_PIX_FMT_YUVA420P16BE:
440 case AV_PIX_FMT_YUVA420P16LE:
441 case AV_PIX_FMT_YUVA422P16BE:
442 case AV_PIX_FMT_YUVA422P16LE:
443 case AV_PIX_FMT_YUVA444P16BE:
444 case AV_PIX_FMT_YUVA444P16LE:
445 case AV_PIX_FMT_NV16:
446 case AV_PIX_FMT_NV20LE:
447 case AV_PIX_FMT_NV20BE:
448 case AV_PIX_FMT_YVYU422:
449 case AV_PIX_FMT_YUVA444P:
450 case AV_PIX_FMT_YUVA422P:
451 case AV_PIX_FMT_YUV420P12BE:
452 case AV_PIX_FMT_YUV420P12LE:
453 case AV_PIX_FMT_YUV420P14BE:
454 case AV_PIX_FMT_YUV420P14LE:
455 case AV_PIX_FMT_YUV422P12BE:
456 case AV_PIX_FMT_YUV422P12LE:
457 case AV_PIX_FMT_YUV422P14BE:
458 case AV_PIX_FMT_YUV422P14LE:
459 case AV_PIX_FMT_YUV444P12BE:
460 case AV_PIX_FMT_YUV444P12LE:
461 case AV_PIX_FMT_YUV444P14BE:
462 case AV_PIX_FMT_YUV444P14LE:
463 case AV_PIX_FMT_YUVJ411P:
471 FFmpegExaminer::has_video () const
473 return static_cast<bool> (_video_stream);