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>
26 #include <libavutil/eval.h>
27 #include <libavutil/display.h>
29 #include "ffmpeg_examiner.h"
30 #include "ffmpeg_content.h"
32 #include "ffmpeg_audio_stream.h"
33 #include "ffmpeg_subtitle_stream.h"
35 #include <boost/foreach.hpp>
43 using boost::shared_ptr;
44 using boost::optional;
46 /** @param job job that the examiner is operating in, or 0 */
47 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
50 , _need_video_length (false)
52 /* Find audio and subtitle streams */
54 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
55 AVStream* s = _format_context->streams[i];
56 if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
58 /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
59 so bodge it here. No idea why we should have to do this.
62 if (s->codec->channel_layout == 0) {
63 s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
66 DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
67 DCPOMATIC_ASSERT (s->codec->codec);
68 DCPOMATIC_ASSERT (s->codec->codec->name);
70 _audio_streams.push_back (
71 shared_ptr<FFmpegAudioStream> (
72 new FFmpegAudioStream (
74 s->codec->codec->name,
76 s->codec->sample_rate,
77 llrint ((double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate),
83 } else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
84 _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (subtitle_stream_name (s), s->id)));
89 /* See if the header has duration information in it */
90 _need_video_length = _format_context->duration == AV_NOPTS_VALUE;
91 if (!_need_video_length) {
92 _video_length = llrint ((double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate().get());
96 if (job && _need_video_length) {
97 job->sub (_("Finding length"));
100 /* Run through until we find:
102 * - the first audio for each stream.
105 int64_t const len = _file_group.length ();
107 int r = av_read_frame (_format_context, &_packet);
114 job->set_progress (float (_format_context->pb->pos) / len);
116 job->set_progress_unknown ();
120 AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
122 if (_video_stream && _packet.stream_index == _video_stream.get()) {
123 video_packet (context);
126 bool got_all_audio = true;
128 for (size_t i = 0; i < _audio_streams.size(); ++i) {
129 if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
130 audio_packet (context, _audio_streams[i]);
132 if (!_audio_streams[i]->first_audio) {
133 got_all_audio = false;
137 av_packet_unref (&_packet);
139 if (_first_video && got_all_audio) {
146 /* This code taken from get_rotation() in ffmpeg:cmdutils.c */
147 AVStream* stream = _format_context->streams[*_video_stream];
148 AVDictionaryEntry* rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);
149 uint8_t* displaymatrix = av_stream_get_side_data (stream, AV_PKT_DATA_DISPLAYMATRIX, 0);
152 if (rotate_tag && *rotate_tag->value && strcmp(rotate_tag->value, "0")) {
154 _rotation = av_strtod (rotate_tag->value, &tail);
160 if (displaymatrix && !_rotation) {
161 _rotation = - av_display_rotation_get ((int32_t*) displaymatrix);
164 _rotation = *_rotation - 360 * floor (*_rotation / 360 + 0.9 / 360);
166 DCPOMATIC_ASSERT (fabs (*_rotation - 90 * round (*_rotation / 90)) < 2);
171 FFmpegExaminer::video_packet (AVCodecContext* context)
173 DCPOMATIC_ASSERT (_video_stream);
175 if (_first_video && !_need_video_length) {
180 if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
182 _first_video = frame_time (_format_context->streams[_video_stream.get()]);
184 if (_need_video_length) {
185 _video_length = frame_time (
186 _format_context->streams[_video_stream.get()]
187 ).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
193 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
195 if (stream->first_audio) {
200 if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
201 stream->first_audio = frame_time (stream->stream (_format_context));
205 optional<ContentTime>
206 FFmpegExaminer::frame_time (AVStream* s) const
208 optional<ContentTime> t;
210 int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
211 if (bet != AV_NOPTS_VALUE) {
212 t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
219 FFmpegExaminer::video_frame_rate () const
221 DCPOMATIC_ASSERT (_video_stream);
222 return av_q2d(av_guess_frame_rate(_format_context, _format_context->streams[_video_stream.get()], 0));
226 FFmpegExaminer::video_size () const
228 return dcp::Size (video_codec_context()->width, video_codec_context()->height);
231 /** @return Length according to our content's header */
233 FFmpegExaminer::video_length () const
235 return max (Frame (1), _video_length);
239 FFmpegExaminer::sample_aspect_ratio () const
241 DCPOMATIC_ASSERT (_video_stream);
242 AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
244 /* I assume this means that we don't know */
245 return optional<double> ();
247 return double (sar.num) / sar.den;
251 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
253 string n = stream_name (s);
263 FFmpegExaminer::stream_name (AVStream* s) const
268 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
273 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
286 FFmpegExaminer::bits_per_pixel () const
288 if (video_codec_context()->pix_fmt == -1) {
289 return optional<int>();
292 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
293 DCPOMATIC_ASSERT (d);
294 return av_get_bits_per_pixel (d);
298 FFmpegExaminer::yuv () const
300 switch (video_codec_context()->pix_fmt) {
301 case AV_PIX_FMT_YUV420P:
302 case AV_PIX_FMT_YUYV422:
303 case AV_PIX_FMT_YUV422P:
304 case AV_PIX_FMT_YUV444P:
305 case AV_PIX_FMT_YUV410P:
306 case AV_PIX_FMT_YUV411P:
307 case AV_PIX_FMT_YUVJ420P:
308 case AV_PIX_FMT_YUVJ422P:
309 case AV_PIX_FMT_YUVJ444P:
310 case AV_PIX_FMT_UYVY422:
311 case AV_PIX_FMT_UYYVYY411:
312 case AV_PIX_FMT_NV12:
313 case AV_PIX_FMT_NV21:
314 case AV_PIX_FMT_YUV440P:
315 case AV_PIX_FMT_YUVJ440P:
316 case AV_PIX_FMT_YUVA420P:
317 case AV_PIX_FMT_YUV420P16LE:
318 case AV_PIX_FMT_YUV420P16BE:
319 case AV_PIX_FMT_YUV422P16LE:
320 case AV_PIX_FMT_YUV422P16BE:
321 case AV_PIX_FMT_YUV444P16LE:
322 case AV_PIX_FMT_YUV444P16BE:
323 case AV_PIX_FMT_YUV420P9BE:
324 case AV_PIX_FMT_YUV420P9LE:
325 case AV_PIX_FMT_YUV420P10BE:
326 case AV_PIX_FMT_YUV420P10LE:
327 case AV_PIX_FMT_YUV422P10BE:
328 case AV_PIX_FMT_YUV422P10LE:
329 case AV_PIX_FMT_YUV444P9BE:
330 case AV_PIX_FMT_YUV444P9LE:
331 case AV_PIX_FMT_YUV444P10BE:
332 case AV_PIX_FMT_YUV444P10LE:
333 case AV_PIX_FMT_YUV422P9BE:
334 case AV_PIX_FMT_YUV422P9LE:
335 case AV_PIX_FMT_YUVA420P9BE:
336 case AV_PIX_FMT_YUVA420P9LE:
337 case AV_PIX_FMT_YUVA422P9BE:
338 case AV_PIX_FMT_YUVA422P9LE:
339 case AV_PIX_FMT_YUVA444P9BE:
340 case AV_PIX_FMT_YUVA444P9LE:
341 case AV_PIX_FMT_YUVA420P10BE:
342 case AV_PIX_FMT_YUVA420P10LE:
343 case AV_PIX_FMT_YUVA422P10BE:
344 case AV_PIX_FMT_YUVA422P10LE:
345 case AV_PIX_FMT_YUVA444P10BE:
346 case AV_PIX_FMT_YUVA444P10LE:
347 case AV_PIX_FMT_YUVA420P16BE:
348 case AV_PIX_FMT_YUVA420P16LE:
349 case AV_PIX_FMT_YUVA422P16BE:
350 case AV_PIX_FMT_YUVA422P16LE:
351 case AV_PIX_FMT_YUVA444P16BE:
352 case AV_PIX_FMT_YUVA444P16LE:
353 case AV_PIX_FMT_NV16:
354 case AV_PIX_FMT_NV20LE:
355 case AV_PIX_FMT_NV20BE:
356 case AV_PIX_FMT_YVYU422:
357 case AV_PIX_FMT_YUVA444P:
358 case AV_PIX_FMT_YUVA422P:
359 case AV_PIX_FMT_YUV420P12BE:
360 case AV_PIX_FMT_YUV420P12LE:
361 case AV_PIX_FMT_YUV420P14BE:
362 case AV_PIX_FMT_YUV420P14LE:
363 case AV_PIX_FMT_YUV422P12BE:
364 case AV_PIX_FMT_YUV422P12LE:
365 case AV_PIX_FMT_YUV422P14BE:
366 case AV_PIX_FMT_YUV422P14LE:
367 case AV_PIX_FMT_YUV444P12BE:
368 case AV_PIX_FMT_YUV444P12LE:
369 case AV_PIX_FMT_YUV444P14BE:
370 case AV_PIX_FMT_YUV444P14LE:
371 case AV_PIX_FMT_YUVJ411P:
379 FFmpegExaminer::has_video () const
381 return static_cast<bool> (_video_stream);