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 extern "C" {
  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>
  28 }
  29 #include "ffmpeg_examiner.h"
  30 #include "ffmpeg_content.h"
  31 #include "job.h"
  32 #include "ffmpeg_audio_stream.h"
  33 #include "ffmpeg_subtitle_stream.h"
  34 #include "util.h"
  35 #include <boost/foreach.hpp>
  36 #include <iostream>
  37
  38 #include "i18n.h"
  39
  40 using std::string;
  41 using std::cout;
  42 using std::max;
  43 using boost::shared_ptr;
  44 using boost::optional;
  45
  46 /** @param job job that the examiner is operating in, or 0 */
  47 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
  48         : FFmpeg (c)
  49         , _video_length (0)
  50         , _need_video_length (false)
  51 {
  52         /* Find audio and subtitle streams */
  53
  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) {
  57
  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.
  60                         */
  61
  62                         if (s->codec->channel_layout == 0) {
  63                                 s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
  64                         }
  65
  66                         DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
  67                         DCPOMATIC_ASSERT (s->codec->codec);
  68                         DCPOMATIC_ASSERT (s->codec->codec->name);
  69
  70                         _audio_streams.push_back (
  71                                 shared_ptr<FFmpegAudioStream> (
  72                                         new FFmpegAudioStream (
  73                                                 stream_name (s),
  74                                                 s->codec->codec->name,
  75                                                 s->id,
  76                                                 s->codec->sample_rate,
  77                                                 llrint ((double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate),
  78                                                 s->codec->channels
  79                                                 )
  80                                         )
  81                                 );
  82
  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)));
  85                 }
  86         }
  87
  88         if (has_video ()) {
  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());
  93                 }
  94         }
  95
  96         if (job && _need_video_length) {
  97                 job->sub (_("Finding length"));
  98         }
  99
 100         /* Run through until we find:
 101          *   - the first video.
 102          *   - the first audio for each stream.
 103          */
 104
 105         int64_t const len = _file_group.length ();
 106         while (true) {
 107                 int r = av_read_frame (_format_context, &_packet);
 108                 if (r < 0) {
 109                         break;
 110                 }
 111
 112                 if (job) {
 113                         if (len > 0) {
 114                                 job->set_progress (float (_format_context->pb->pos) / len);
 115                         } else {
 116                                 job->set_progress_unknown ();
 117                         }
 118                 }
 119
 120                 AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
 121
 122                 if (_video_stream && _packet.stream_index == _video_stream.get()) {
 123                         video_packet (context);
 124                 }
 125
 126                 bool got_all_audio = true;
 127
 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]);
 131                         }
 132                         if (!_audio_streams[i]->first_audio) {
 133                                 got_all_audio = false;
 134                         }
 135                 }
 136
 137                 av_packet_unref (&_packet);
 138
 139                 if (_first_video && got_all_audio) {
 140                         /* All done */
 141                         break;
 142                 }
 143         }
 144
 145         if (_video_stream) {
 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);
 150                 _rotation = 0;
 151
 152                 if (rotate_tag && *rotate_tag->value && strcmp(rotate_tag->value, "0")) {
 153                         char *tail;
 154                         _rotation = av_strtod (rotate_tag->value, &tail);
 155                         if (*tail) {
 156                                 _rotation = 0;
 157                         }
 158                 }
 159
 160                 if (displaymatrix && !_rotation) {
 161                         _rotation = - av_display_rotation_get ((int32_t*) displaymatrix);
 162                 }
 163
 164                 _rotation = *_rotation - 360 * floor (*_rotation / 360 + 0.9 / 360);
 165
 166                 DCPOMATIC_ASSERT (fabs (*_rotation - 90 * round (*_rotation / 90)) < 2);
 167         }
 168 }
 169
 170 void
 171 FFmpegExaminer::video_packet (AVCodecContext* context)
 172 {
 173         DCPOMATIC_ASSERT (_video_stream);
 174
 175         if (_first_video && !_need_video_length) {
 176                 return;
 177         }
 178
 179         int frame_finished;
 180         if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 181                 if (!_first_video) {
 182                         _first_video = frame_time (_format_context->streams[_video_stream.get()]);
 183                 }
 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 ());
 188                 }
 189         }
 190 }
 191
 192 void
 193 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
 194 {
 195         if (stream->first_audio) {
 196                 return;
 197         }
 198
 199         int frame_finished;
 200         if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 201                 stream->first_audio = frame_time (stream->stream (_format_context));
 202         }
 203 }
 204
 205 optional<ContentTime>
 206 FFmpegExaminer::frame_time (AVStream* s) const
 207 {
 208         optional<ContentTime> t;
 209
 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));
 213         }
 214
 215         return t;
 216 }
 217
 218 optional<double>
 219 FFmpegExaminer::video_frame_rate () const
 220 {
 221         DCPOMATIC_ASSERT (_video_stream);
 222         return av_q2d(av_guess_frame_rate(_format_context, _format_context->streams[_video_stream.get()], 0));
 223 }
 224
 225 dcp::Size
 226 FFmpegExaminer::video_size () const
 227 {
 228         return dcp::Size (video_codec_context()->width, video_codec_context()->height);
 229 }
 230
 231 /** @return Length according to our content's header */
 232 Frame
 233 FFmpegExaminer::video_length () const
 234 {
 235         return max (Frame (1), _video_length);
 236 }
 237
 238 optional<double>
 239 FFmpegExaminer::sample_aspect_ratio () const
 240 {
 241         DCPOMATIC_ASSERT (_video_stream);
 242         AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
 243         if (sar.num == 0) {
 244                 /* I assume this means that we don't know */
 245                 return optional<double> ();
 246         }
 247         return double (sar.num) / sar.den;
 248 }
 249
 250 string
 251 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
 252 {
 253         string n = stream_name (s);
 254
 255         if (n.empty()) {
 256                 n = _("unknown");
 257         }
 258
 259         return n;
 260 }
 261
 262 string
 263 FFmpegExaminer::stream_name (AVStream* s) const
 264 {
 265         string n;
 266
 267         if (s->metadata) {
 268                 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
 269                 if (lang) {
 270                         n = lang->value;
 271                 }
 272
 273                 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
 274                 if (title) {
 275                         if (!n.empty()) {
 276                                 n += " ";
 277                         }
 278                         n += title->value;
 279                 }
 280         }
 281
 282         return n;
 283 }
 284
 285 optional<int>
 286 FFmpegExaminer::bits_per_pixel () const
 287 {
 288         if (video_codec_context()->pix_fmt == -1) {
 289                 return optional<int>();
 290         }
 291
 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);
 295 }
 296
 297 bool
 298 FFmpegExaminer::yuv () const
 299 {
 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:
 372                 return true;
 373         default:
 374                 return false;
 375         }
 376 }
 377
 378 bool
 379 FFmpegExaminer::has_video () const
 380 {
 381         return static_cast<bool> (_video_stream);
 382 }