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 }
  27 #include "ffmpeg_examiner.h"
  28 #include "ffmpeg_content.h"
  29 #include "job.h"
  30 #include "ffmpeg_audio_stream.h"
  31 #include "ffmpeg_subtitle_stream.h"
  32 #include "util.h"
  33 #include <boost/foreach.hpp>
  34 #include <iostream>
  35
  36 #include "i18n.h"
  37
  38 using std::string;
  39 using std::cout;
  40 using std::max;
  41 using boost::shared_ptr;
  42 using boost::optional;
  43
  44 /** @param job job that the examiner is operating in, or 0 */
  45 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
  46         : FFmpeg (c)
  47         , _video_length (0)
  48         , _need_video_length (false)
  49 {
  50         /* Find audio and subtitle streams */
  51
  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) {
  55
  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.
  58                         */
  59
  60                         if (s->codec->channel_layout == 0) {
  61                                 s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
  62                         }
  63
  64                         DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
  65                         DCPOMATIC_ASSERT (s->codec->codec);
  66                         DCPOMATIC_ASSERT (s->codec->codec->name);
  67
  68                         _audio_streams.push_back (
  69                                 shared_ptr<FFmpegAudioStream> (
  70                                         new FFmpegAudioStream (
  71                                                 stream_name (s),
  72                                                 s->codec->codec->name,
  73                                                 s->id,
  74                                                 s->codec->sample_rate,
  75                                                 (double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate,
  76                                                 s->codec->channels
  77                                                 )
  78                                         )
  79                                 );
  80
  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)));
  83                 }
  84         }
  85
  86         if (has_video ()) {
  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 ();
  91                 }
  92         }
  93
  94         if (job && _need_video_length) {
  95                 job->sub (_("Finding length"));
  96         }
  97
  98         /* Run through until we find:
  99          *   - the first video.
 100          *   - the first audio for each stream.
 101          */
 102
 103         int64_t const len = _file_group.length ();
 104         while (true) {
 105                 int r = av_read_frame (_format_context, &_packet);
 106                 if (r < 0) {
 107                         break;
 108                 }
 109
 110                 if (job) {
 111                         if (len > 0) {
 112                                 job->set_progress (float (_format_context->pb->pos) / len);
 113                         } else {
 114                                 job->set_progress_unknown ();
 115                         }
 116                 }
 117
 118                 AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
 119
 120                 if (_video_stream && _packet.stream_index == _video_stream.get()) {
 121                         video_packet (context);
 122                 }
 123
 124                 bool got_all_audio = true;
 125
 126                 for (size_t i = 0; i < _audio_streams.size(); ++i) {
 127                         if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
 128                                 audio_packet (context, _audio_streams[i]);
 129                         }
 130                         if (!_audio_streams[i]->first_audio) {
 131                                 got_all_audio = false;
 132                         }
 133                 }
 134
 135                 av_packet_unref (&_packet);
 136
 137                 if (_first_video && got_all_audio) {
 138                         /* All done */
 139                         break;
 140                 }
 141         }
 142 }
 143
 144 void
 145 FFmpegExaminer::video_packet (AVCodecContext* context)
 146 {
 147         DCPOMATIC_ASSERT (_video_stream);
 148
 149         if (_first_video && !_need_video_length) {
 150                 return;
 151         }
 152
 153         int frame_finished;
 154         if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 155                 if (!_first_video) {
 156                         _first_video = frame_time (_format_context->streams[_video_stream.get()]);
 157                 }
 158                 if (_need_video_length) {
 159                         _video_length = frame_time (
 160                                 _format_context->streams[_video_stream.get()]
 161                                 ).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
 162                 }
 163         }
 164 }
 165
 166 void
 167 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
 168 {
 169         if (stream->first_audio) {
 170                 return;
 171         }
 172
 173         int frame_finished;
 174         if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
 175                 stream->first_audio = frame_time (stream->stream (_format_context));
 176         }
 177 }
 178
 179 optional<ContentTime>
 180 FFmpegExaminer::frame_time (AVStream* s) const
 181 {
 182         optional<ContentTime> t;
 183
 184         int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
 185         if (bet != AV_NOPTS_VALUE) {
 186                 t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
 187         }
 188
 189         return t;
 190 }
 191
 192 optional<double>
 193 FFmpegExaminer::video_frame_rate () const
 194 {
 195         DCPOMATIC_ASSERT (_video_stream);
 196         /* This use of r_frame_rate is debateable; there's a few different
 197          * frame rates in the format context, but this one seems to be the most
 198          * reliable.
 199          */
 200         return av_q2d (av_stream_get_r_frame_rate (_format_context->streams[_video_stream.get()]));
 201 }
 202
 203 dcp::Size
 204 FFmpegExaminer::video_size () const
 205 {
 206         return dcp::Size (video_codec_context()->width, video_codec_context()->height);
 207 }
 208
 209 /** @return Length according to our content's header */
 210 Frame
 211 FFmpegExaminer::video_length () const
 212 {
 213         return max (Frame (1), _video_length);
 214 }
 215
 216 optional<double>
 217 FFmpegExaminer::sample_aspect_ratio () const
 218 {
 219         DCPOMATIC_ASSERT (_video_stream);
 220         AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
 221         if (sar.num == 0) {
 222                 /* I assume this means that we don't know */
 223                 return optional<double> ();
 224         }
 225         return double (sar.num) / sar.den;
 226 }
 227
 228 string
 229 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
 230 {
 231         string n = stream_name (s);
 232
 233         if (n.empty()) {
 234                 n = _("unknown");
 235         }
 236
 237         return n;
 238 }
 239
 240 string
 241 FFmpegExaminer::stream_name (AVStream* s) const
 242 {
 243         string n;
 244
 245         if (s->metadata) {
 246                 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
 247                 if (lang) {
 248                         n = lang->value;
 249                 }
 250
 251                 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
 252                 if (title) {
 253                         if (!n.empty()) {
 254                                 n += " ";
 255                         }
 256                         n += title->value;
 257                 }
 258         }
 259
 260         return n;
 261 }
 262
 263 int
 264 FFmpegExaminer::bits_per_pixel () const
 265 {
 266         if (video_codec_context()->pix_fmt == -1) {
 267                 throw DecodeError (_("Could not find pixel format for video."));
 268         }
 269
 270         AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
 271         DCPOMATIC_ASSERT (d);
 272         return av_get_bits_per_pixel (d);
 273 }
 274
 275 bool
 276 FFmpegExaminer::yuv () const
 277 {
 278         switch (video_codec_context()->pix_fmt) {
 279         case AV_PIX_FMT_YUV420P:
 280         case AV_PIX_FMT_YUYV422:
 281         case AV_PIX_FMT_YUV422P:
 282         case AV_PIX_FMT_YUV444P:
 283         case AV_PIX_FMT_YUV410P:
 284         case AV_PIX_FMT_YUV411P:
 285         case AV_PIX_FMT_YUVJ420P:
 286         case AV_PIX_FMT_YUVJ422P:
 287         case AV_PIX_FMT_YUVJ444P:
 288         case AV_PIX_FMT_UYVY422:
 289         case AV_PIX_FMT_UYYVYY411:
 290         case AV_PIX_FMT_NV12:
 291         case AV_PIX_FMT_NV21:
 292         case AV_PIX_FMT_YUV440P:
 293         case AV_PIX_FMT_YUVJ440P:
 294         case AV_PIX_FMT_YUVA420P:
 295         case AV_PIX_FMT_YUV420P16LE:
 296         case AV_PIX_FMT_YUV420P16BE:
 297         case AV_PIX_FMT_YUV422P16LE:
 298         case AV_PIX_FMT_YUV422P16BE:
 299         case AV_PIX_FMT_YUV444P16LE:
 300         case AV_PIX_FMT_YUV444P16BE:
 301         case AV_PIX_FMT_YUV420P9BE:
 302         case AV_PIX_FMT_YUV420P9LE:
 303         case AV_PIX_FMT_YUV420P10BE:
 304         case AV_PIX_FMT_YUV420P10LE:
 305         case AV_PIX_FMT_YUV422P10BE:
 306         case AV_PIX_FMT_YUV422P10LE:
 307         case AV_PIX_FMT_YUV444P9BE:
 308         case AV_PIX_FMT_YUV444P9LE:
 309         case AV_PIX_FMT_YUV444P10BE:
 310         case AV_PIX_FMT_YUV444P10LE:
 311         case AV_PIX_FMT_YUV422P9BE:
 312         case AV_PIX_FMT_YUV422P9LE:
 313         case AV_PIX_FMT_YUVA420P9BE:
 314         case AV_PIX_FMT_YUVA420P9LE:
 315         case AV_PIX_FMT_YUVA422P9BE:
 316         case AV_PIX_FMT_YUVA422P9LE:
 317         case AV_PIX_FMT_YUVA444P9BE:
 318         case AV_PIX_FMT_YUVA444P9LE:
 319         case AV_PIX_FMT_YUVA420P10BE:
 320         case AV_PIX_FMT_YUVA420P10LE:
 321         case AV_PIX_FMT_YUVA422P10BE:
 322         case AV_PIX_FMT_YUVA422P10LE:
 323         case AV_PIX_FMT_YUVA444P10BE:
 324         case AV_PIX_FMT_YUVA444P10LE:
 325         case AV_PIX_FMT_YUVA420P16BE:
 326         case AV_PIX_FMT_YUVA420P16LE:
 327         case AV_PIX_FMT_YUVA422P16BE:
 328         case AV_PIX_FMT_YUVA422P16LE:
 329         case AV_PIX_FMT_YUVA444P16BE:
 330         case AV_PIX_FMT_YUVA444P16LE:
 331         case AV_PIX_FMT_NV16:
 332         case AV_PIX_FMT_NV20LE:
 333         case AV_PIX_FMT_NV20BE:
 334         case AV_PIX_FMT_YVYU422:
 335         case AV_PIX_FMT_YUVA444P:
 336         case AV_PIX_FMT_YUVA422P:
 337         case AV_PIX_FMT_YUV420P12BE:
 338         case AV_PIX_FMT_YUV420P12LE:
 339         case AV_PIX_FMT_YUV420P14BE:
 340         case AV_PIX_FMT_YUV420P14LE:
 341         case AV_PIX_FMT_YUV422P12BE:
 342         case AV_PIX_FMT_YUV422P12LE:
 343         case AV_PIX_FMT_YUV422P14BE:
 344         case AV_PIX_FMT_YUV422P14LE:
 345         case AV_PIX_FMT_YUV444P12BE:
 346         case AV_PIX_FMT_YUV444P12LE:
 347         case AV_PIX_FMT_YUV444P14BE:
 348         case AV_PIX_FMT_YUV444P14LE:
 349         case AV_PIX_FMT_YUVJ411P:
 350                 return true;
 351         default:
 352                 return false;
 353         }
 354 }
 355
 356 bool
 357 FFmpegExaminer::has_video () const
 358 {
 359         return static_cast<bool> (_video_stream);
 360 }