src/lib/ffmpeg_file_encoder.h

   1 /*
   2     Copyright (C) 2017-2018 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
  22 #ifndef DCPOMATIC_FFMPEG_FILE_ENCODER_H
  23 #define DCPOMATIC_FFMPEG_FILE_ENCODER_H
  24
  25
  26 #include "audio_mapping.h"
  27 #include "dcpomatic_time.h"
  28 #include "encoder.h"
  29 #include "event_history.h"
  30 #include "log.h"
  31 #include <dcp/key.h>
  32 #include <dcp/warnings.h>
  33 LIBDCP_DISABLE_WARNINGS
  34 extern "C" {
  35 #include <libavcodec/avcodec.h>
  36 #include <libavformat/avformat.h>
  37 }
  38 LIBDCP_ENABLE_WARNINGS
  39
  40
  41 class ExportAudioStream;
  42
  43
  44 class FFmpegFileEncoder
  45 {
  46 public:
  47         FFmpegFileEncoder (
  48                 dcp::Size video_frame_size,
  49                 int video_frame_rate,
  50                 int audio_frame_rate,
  51                 int channels,
  52                 ExportFormat,
  53                 bool audio_stream_per_channel,
  54                 int x264_crf,
  55                 boost::filesystem::path output
  56                 );
  57
  58         ~FFmpegFileEncoder ();
  59
  60         void video (std::shared_ptr<PlayerVideo>, dcpomatic::DCPTime);
  61         void audio (std::shared_ptr<AudioBuffers>);
  62         void subtitle (PlayerText, dcpomatic::DCPTimePeriod);
  63
  64         void flush ();
  65
  66         static AVPixelFormat pixel_format (ExportFormat format);
  67
  68 private:
  69         void setup_video ();
  70         void setup_audio ();
  71
  72         void audio_frame (int size);
  73
  74         static void buffer_free(void* opaque, uint8_t* data);
  75         void buffer_free2(uint8_t* data);
  76
  77         AVCodec const * _video_codec = nullptr;
  78         AVCodecContext* _video_codec_context = nullptr;
  79         std::vector<std::shared_ptr<ExportAudioStream>> _audio_streams;
  80         bool _audio_stream_per_channel;
  81         AVFormatContext* _format_context = nullptr;
  82         AVStream* _video_stream = nullptr;
  83         AVPixelFormat _pixel_format;
  84         AVSampleFormat _sample_format;
  85         AVDictionary* _video_options = nullptr;
  86         std::string _video_codec_name;
  87         std::string _audio_codec_name;
  88         int _audio_channels;
  89
  90         boost::filesystem::path _output;
  91         dcp::Size _video_frame_size;
  92         int _video_frame_rate;
  93         int _audio_frame_rate;
  94
  95         int64_t _audio_frames = 0;
  96
  97         std::shared_ptr<AudioBuffers> _pending_audio;
  98
  99         /** Store of shared_ptr<Image> to keep them alive whilst raw pointers into
 100             their data have been passed to FFmpeg.
 101         */
 102         std::map<uint8_t*, std::shared_ptr<const Image>> _pending_images;
 103         boost::mutex _pending_images_mutex;
 104
 105         static int _video_stream_index;
 106         static int _audio_stream_index_base;
 107 };
 108
 109 #endif