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