src/lib/ffmpeg_examiner.cc

   1 /*
   2     Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   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.
  10
  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.
  15
  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/>.
  18
  19 */
  20
  21 #include "ffmpeg_examiner.h"
  22 #include "ffmpeg_content.h"
  23 #include "job.h"
  24 #include "ffmpeg_audio_stream.h"
  25 #include "ffmpeg_subtitle_stream.h"
  26 #include "util.h"
  27 #include "warnings.h"
  28 DCPOMATIC_DISABLE_WARNINGS
  29 extern "C" {
  30 #include <libavcodec/avcodec.h>
  31 #include <libavformat/avformat.h>
  32 #include <libavutil/pixfmt.h>
  33 #include <libavutil/pixdesc.h>
  34 #include <libavutil/eval.h>
  35 #include <libavutil/display.h>
  36 }
  37 DCPOMATIC_ENABLE_WARNINGS
  38 #include <boost/foreach.hpp>
  39 #include <iostream>
  40
  41 #include "i18n.h"
  42
  43 using std::string;
  44 using std::cout;
  45 using std::max;
  46 using boost::shared_ptr;
  47 using boost::optional;
  48 using namespace dcpomatic;
  49
  50
  51 /** @param job job that the examiner is operating in, or 0 */
  52 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
  53         : FFmpeg (c)
  54         , _video_length (0)
  55         , _need_video_length (false)
  56 {
  57         /* Find audio and subtitle streams */
  58
  59         for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
  60                 AVStream* s = _format_context->streams[i];
  61 DCPOMATIC_DISABLE_WARNINGS
  62                 if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
  63
  64                         /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
  65                            so bodge it here.  No idea why we should have to do this.
  66                         */
  67
  68                         if (s->codec->channel_layout == 0) {
  69                                 s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
  70                         }
  71
  72                         DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
  73                         DCPOMATIC_ASSERT (s->codec->codec);
  74                         DCPOMATIC_ASSERT (s->codec->codec->name);
  75
  76                         _audio_streams.push_back (
  77                                 shared_ptr<FFmpegAudioStream> (
  78                                         new FFmpegAudioStream (
  79                                                 stream_name (s),
  80                                                 s->codec->codec->name,
  81                                                 s->id,
  82                                                 s->codec->sample_rate,
  83                                                 llrint ((double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate),
  84                                                 s->codec->channels
  85                                                 )
  86                                         )
  87                                 );
  88
  89                 } else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
  90                         _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (subtitle_stream_name (s), s->id)));
  91                 }
  92         }
  93
  94         if (has_video ()) {
  95                 /* See if the header has duration information in it */
  96                 _need_video_length = _format_context->duration == AV_NOPTS_VALUE;
  97                 if (!_need_video_length) {
  98                         _video_length = llrint ((double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate().get());
  99                 }
 100         }
 101
 102         if (job && _need_video_length) {
 103                 job->sub (_("Finding length"));
 104         }
 105
 106         /* Run through until we find:
 107          *   - the first video.
 108          *   - the first audio for each stream.
 109          */
 110
 111         int64_t const len = _file_group.length ();
 112         while (true) {
 113                 int r = av_read_frame (_format_context, &_packet);
 114                 if (r < 0) {
 115                         break;
 116                 }
 117
 118                 if (job) {
 119                         if (len > 0) {
 120                                 job->set_progress (float (_format_context->pb->pos) / len);
 121                         } else {
 122                                 job->set_progress_unknown ();
 123                         }
 124                 }
 125
 126                 AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
 127 DCPOMATIC_ENABLE_WARNINGS
 128
 129                 if (_video_stream && _packet.stream_index == _video_stream.get()) {
 130                         video_packet (context);
 131                 }
 132
 133                 bool got_all_audio = true;
 134
 135                 for (size_t i = 0; i < _audio_streams.size(); ++i) {
 136                         if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
 137                                 audio_packet (context, _audio_streams[i]);
 138                         }
 139                         if (!_audio_streams[i]->first_audio) {
 140                                 got_all_audio = false;
 141                         }
 142                 }
 143
 144                 av_packet_unref (&_packet);
 145
 146                 if (_first_video && got_all_audio) {
 147                         /* All done */
 148                         break;
 149                 }
 150         }
 151
 152         if (_video_stream) {
 153                 /* This code taken from get_rotation() in ffmpeg:cmdutils.c */
 154                 AVStream* stream = _format_context->streams[*_video_stream];
 155                 AVDictionaryEntry* rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);
 156                 uint8_t* displaymatrix = av_stream_get_side_data (stream, AV_PKT_DATA_DISPLAYMATRIX, 0);
 157                 _rotation = 0;
 158
 159                 if (rotate_tag && *rotate_tag->value && strcmp(rotate_tag->value, "0")) {
 160                         char *tail;
 161                         _rotation = av_strtod (rotate_tag->value, &tail);
 162                         if (*tail) {
 163                                 _rotation = 0;
 164                         }
 165                 }
 166
 167                 if (displaymatrix && !_rotation) {
 168                         _rotation = - av_display_rotation_get ((int32_t*) displaymatrix);
 169                 }
 170
 171                 _rotation = *_rotation - 360 * floor (*_rotation / 360 + 0.9 / 360);
 172
 173                 DCPOMATIC_ASSERT (fabs (*_rotation - 90 * round (*_rotation / 90)) < 2);
 174         }
 175
 176 #ifdef DCPOMATIC_VARIANT_SWAROOP
 177         AVDictionaryEntry* e = av_dict_get (_format_context->metadata, SWAROOP_ID_TAG, 0, 0);
 178         if (e) {
 179                 _id = e->value;
 180         }
 181 #endif
 182 }
 183
 184
 185 void
 186 FFmpegExaminer::video_packet (AVCodecContext* context)
 187 {
 188         DCPOMATIC_ASSERT (_video_stream);
 189
 190         if (_first_video && !_need_video_length) {
 191                 return;
 192         }
 193
 194         int frame_finished;
 195 DCPOMATIC_DISABLE_WARNINGS
 196         if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 197 DCPOMATIC_ENABLE_WARNINGS
 198                 if (!_first_video) {
 199                         _first_video = frame_time (_format_context->streams[_video_stream.get()]);
 200                 }
 201                 if (_need_video_length) {
 202                         _video_length = frame_time (
 203                                 _format_context->streams[_video_stream.get()]
 204                                 ).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
 205                 }
 206         }
 207 }
 208
 209
 210 void
 211 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
 212 {
 213         if (stream->first_audio) {
 214                 return;
 215         }
 216
 217         int frame_finished;
 218 DCPOMATIC_DISABLE_WARNINGS
 219         if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 220 DCPOMATIC_ENABLE_WARNINGS
 221                 stream->first_audio = frame_time (stream->stream (_format_context));
 222         }
 223 }
 224
 225
 226 optional<ContentTime>
 227 FFmpegExaminer::frame_time (AVStream* s) const
 228 {
 229         optional<ContentTime> t;
 230
 231 DCPOMATIC_DISABLE_WARNINGS
 232         int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
 233 DCPOMATIC_ENABLE_WARNINGS
 234         if (bet != AV_NOPTS_VALUE) {
 235                 t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
 236         }
 237
 238         return t;
 239 }
 240
 241
 242 optional<double>
 243 FFmpegExaminer::video_frame_rate () const
 244 {
 245         DCPOMATIC_ASSERT (_video_stream);
 246         return av_q2d(av_guess_frame_rate(_format_context, _format_context->streams[_video_stream.get()], 0));
 247 }
 248
 249 dcp::Size
 250 FFmpegExaminer::video_size () const
 251 {
 252         return dcp::Size (video_codec_context()->width, video_codec_context()->height);
 253 }
 254
 255 /** @return Length according to our content's header */
 256 Frame
 257 FFmpegExaminer::video_length () const
 258 {
 259         return max (Frame (1), _video_length);
 260 }
 261
 262 optional<double>
 263 FFmpegExaminer::sample_aspect_ratio () const
 264 {
 265         DCPOMATIC_ASSERT (_video_stream);
 266         AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
 267         if (sar.num == 0) {
 268                 /* I assume this means that we don't know */
 269                 return optional<double> ();
 270         }
 271         return double (sar.num) / sar.den;
 272 }
 273
 274 string
 275 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
 276 {
 277         string n = stream_name (s);
 278
 279         if (n.empty()) {
 280                 n = _("unknown");
 281         }
 282
 283         return n;
 284 }
 285
 286 string
 287 FFmpegExaminer::stream_name (AVStream* s) const
 288 {
 289         string n;
 290
 291         if (s->metadata) {
 292                 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
 293                 if (lang) {
 294                         n = lang->value;
 295                 }
 296
 297                 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
 298                 if (title) {
 299                         if (!n.empty()) {
 300                                 n += " ";
 301                         }
 302                         n += title->value;
 303                 }
 304         }
 305
 306         return n;
 307 }
 308
 309 optional<int>
 310 FFmpegExaminer::bits_per_pixel () const
 311 {
 312         if (video_codec_context()->pix_fmt == -1) {
 313                 return optional<int>();
 314         }
 315
 316         AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
 317         DCPOMATIC_ASSERT (d);
 318         return av_get_bits_per_pixel (d);
 319 }
 320
 321 bool
 322 FFmpegExaminer::yuv () const
 323 {
 324         switch (video_codec_context()->pix_fmt) {
 325         case AV_PIX_FMT_YUV420P:
 326         case AV_PIX_FMT_YUYV422:
 327         case AV_PIX_FMT_YUV422P:
 328         case AV_PIX_FMT_YUV444P:
 329         case AV_PIX_FMT_YUV410P:
 330         case AV_PIX_FMT_YUV411P:
 331         case AV_PIX_FMT_YUVJ420P:
 332         case AV_PIX_FMT_YUVJ422P:
 333         case AV_PIX_FMT_YUVJ444P:
 334         case AV_PIX_FMT_UYVY422:
 335         case AV_PIX_FMT_UYYVYY411:
 336         case AV_PIX_FMT_NV12:
 337         case AV_PIX_FMT_NV21:
 338         case AV_PIX_FMT_YUV440P:
 339         case AV_PIX_FMT_YUVJ440P:
 340         case AV_PIX_FMT_YUVA420P:
 341         case AV_PIX_FMT_YUV420P16LE:
 342         case AV_PIX_FMT_YUV420P16BE:
 343         case AV_PIX_FMT_YUV422P16LE:
 344         case AV_PIX_FMT_YUV422P16BE:
 345         case AV_PIX_FMT_YUV444P16LE:
 346         case AV_PIX_FMT_YUV444P16BE:
 347         case AV_PIX_FMT_YUV420P9BE:
 348         case AV_PIX_FMT_YUV420P9LE:
 349         case AV_PIX_FMT_YUV420P10BE:
 350         case AV_PIX_FMT_YUV420P10LE:
 351         case AV_PIX_FMT_YUV422P10BE:
 352         case AV_PIX_FMT_YUV422P10LE:
 353         case AV_PIX_FMT_YUV444P9BE:
 354         case AV_PIX_FMT_YUV444P9LE:
 355         case AV_PIX_FMT_YUV444P10BE:
 356         case AV_PIX_FMT_YUV444P10LE:
 357         case AV_PIX_FMT_YUV422P9BE:
 358         case AV_PIX_FMT_YUV422P9LE:
 359         case AV_PIX_FMT_YUVA420P9BE:
 360         case AV_PIX_FMT_YUVA420P9LE:
 361         case AV_PIX_FMT_YUVA422P9BE:
 362         case AV_PIX_FMT_YUVA422P9LE:
 363         case AV_PIX_FMT_YUVA444P9BE:
 364         case AV_PIX_FMT_YUVA444P9LE:
 365         case AV_PIX_FMT_YUVA420P10BE:
 366         case AV_PIX_FMT_YUVA420P10LE:
 367         case AV_PIX_FMT_YUVA422P10BE:
 368         case AV_PIX_FMT_YUVA422P10LE:
 369         case AV_PIX_FMT_YUVA444P10BE:
 370         case AV_PIX_FMT_YUVA444P10LE:
 371         case AV_PIX_FMT_YUVA420P16BE:
 372         case AV_PIX_FMT_YUVA420P16LE:
 373         case AV_PIX_FMT_YUVA422P16BE:
 374         case AV_PIX_FMT_YUVA422P16LE:
 375         case AV_PIX_FMT_YUVA444P16BE:
 376         case AV_PIX_FMT_YUVA444P16LE:
 377         case AV_PIX_FMT_NV16:
 378         case AV_PIX_FMT_NV20LE:
 379         case AV_PIX_FMT_NV20BE:
 380         case AV_PIX_FMT_YVYU422:
 381         case AV_PIX_FMT_YUVA444P:
 382         case AV_PIX_FMT_YUVA422P:
 383         case AV_PIX_FMT_YUV420P12BE:
 384         case AV_PIX_FMT_YUV420P12LE:
 385         case AV_PIX_FMT_YUV420P14BE:
 386         case AV_PIX_FMT_YUV420P14LE:
 387         case AV_PIX_FMT_YUV422P12BE:
 388         case AV_PIX_FMT_YUV422P12LE:
 389         case AV_PIX_FMT_YUV422P14BE:
 390         case AV_PIX_FMT_YUV422P14LE:
 391         case AV_PIX_FMT_YUV444P12BE:
 392         case AV_PIX_FMT_YUV444P12LE:
 393         case AV_PIX_FMT_YUV444P14BE:
 394         case AV_PIX_FMT_YUV444P14LE:
 395         case AV_PIX_FMT_YUVJ411P:
 396                 return true;
 397         default:
 398                 return false;
 399         }
 400 }
 401
 402 bool
 403 FFmpegExaminer::has_video () const
 404 {
 405         return static_cast<bool> (_video_stream);
 406 }
 407
 408 VideoRange
 409 FFmpegExaminer::range () const
 410 {
 411         switch (color_range()) {
 412         case AVCOL_RANGE_MPEG:
 413         case AVCOL_RANGE_UNSPECIFIED:
 414                 return VIDEO_RANGE_VIDEO;
 415         case AVCOL_RANGE_JPEG:
 416         default:
 417                 return VIDEO_RANGE_FULL;
 418         }
 419 }