2 Copyright (C) 2013-2019 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
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.
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.
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/>.
22 #include "ffmpeg_content.h"
24 #include "exceptions.h"
27 #include "dcpomatic_log.h"
28 #include "ffmpeg_subtitle_stream.h"
29 #include "ffmpeg_audio_stream.h"
30 #include "decrypted_ecinema_kdm.h"
32 #include "compose.hpp"
34 #include <dcp/raw_convert.h>
36 #include <libavcodec/avcodec.h>
37 #include <libavformat/avformat.h>
38 #include <libswscale/swscale.h>
40 #include <boost/algorithm/string.hpp>
41 #include <boost/foreach.hpp>
50 using boost::shared_ptr;
51 using boost::optional;
52 using dcp::raw_convert;
53 using namespace dcpomatic;
55 boost::mutex FFmpeg::_mutex;
57 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
60 , _avio_buffer_size (4096)
71 boost::mutex::scoped_lock lm (_mutex);
73 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
74 avcodec_close (_format_context->streams[i]->codec);
77 av_frame_free (&_frame);
78 avformat_close_input (&_format_context);
82 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
84 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
88 avio_seek_wrapper (void* data, int64_t offset, int whence)
90 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
94 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
96 if (level > AV_LOG_WARNING) {
101 static int prefix = 0;
102 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
104 boost::algorithm::trim (str);
105 dcpomatic_log->log (String::compose ("FFmpeg: %1", str), LogEntry::TYPE_GENERAL);
109 FFmpeg::setup_general ()
111 /* This might not work too well in some cases of multiple FFmpeg decoders,
112 but it's probably good enough.
114 av_log_set_callback (FFmpeg::ffmpeg_log_callback);
116 _file_group.set_paths (_ffmpeg_content->paths ());
117 _avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc (_avio_buffer_size));
118 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
119 _format_context = avformat_alloc_context ();
120 _format_context->pb = _avio_context;
122 AVDictionary* options = 0;
123 /* These durations are in microseconds, and represent how far into the content file
124 we will look for streams.
126 av_dict_set (&options, "analyzeduration", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
127 av_dict_set (&options, "probesize", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
128 if (_ffmpeg_content->kdm()) {
129 DecryptedECinemaKDM kdm (_ffmpeg_content->kdm().get(), Config::instance()->decryption_chain()->key().get());
130 av_dict_set (&options, "decryption_key", kdm.key().hex().c_str(), 0);
133 int e = avformat_open_input (&_format_context, 0, 0, &options);
135 throw OpenFileError (_ffmpeg_content->path(0).string(), e, true);
138 if (avformat_find_stream_info (_format_context, 0) < 0) {
139 throw DecodeError (_("could not find stream information"));
142 /* Find video stream */
144 optional<int> video_stream_undefined_frame_rate;
146 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
147 AVStream* s = _format_context->streams[i];
148 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO && avcodec_find_decoder(s->codec->codec_id)) {
149 if (s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
150 /* This is definitely our video stream */
153 /* This is our video stream if we don't get a better offer */
154 video_stream_undefined_frame_rate = i;
159 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
160 to zero. Only use such a stream if there is no alternative.
162 if (!_video_stream && video_stream_undefined_frame_rate) {
163 _video_stream = video_stream_undefined_frame_rate.get();
166 /* Hack: if the AVStreams have duplicate IDs, replace them with our
167 own. We use the IDs so that we can cope with VOBs, in which streams
168 move about in index but remain with the same ID in different
169 VOBs. However, some files have duplicate IDs, hence this hack.
172 bool duplicates = false;
173 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
174 for (uint32_t j = i + 1; j < _format_context->nb_streams; ++j) {
175 if (_format_context->streams[i]->id == _format_context->streams[j]->id) {
182 /* Put in our own IDs */
183 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
184 _format_context->streams[i]->id = i;
188 _frame = av_frame_alloc ();
190 throw DecodeError (N_("could not allocate frame"));
195 FFmpeg::setup_decoders ()
197 boost::mutex::scoped_lock lm (_mutex);
199 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
200 AVCodecContext* context = _format_context->streams[i]->codec;
202 AVCodec* codec = avcodec_find_decoder (context->codec_id);
205 AVDictionary* options = 0;
206 /* This option disables decoding of DCA frame footers in our patched version
207 of FFmpeg. I believe these footers are of no use to us, and they can cause
208 problems when FFmpeg fails to decode them (mantis #352).
210 av_dict_set (&options, "disable_footer", "1", 0);
211 /* This allows decoding of some DNxHR 444 and HQX files; see
212 https://trac.ffmpeg.org/ticket/5681
214 av_dict_set_int (&options, "strict", FF_COMPLIANCE_EXPERIMENTAL, 0);
215 /* Enable following of links in files */
216 av_dict_set_int (&options, "enable_drefs", 1, 0);
218 if (avcodec_open2 (context, codec, &options) < 0) {
219 throw DecodeError (N_("could not open decoder"));
222 dcpomatic_log->log (String::compose ("No codec found for stream %1", i), LogEntry::TYPE_WARNING);
228 FFmpeg::video_codec_context () const
230 if (!_video_stream) {
234 return _format_context->streams[_video_stream.get()]->codec;
238 FFmpeg::subtitle_codec_context () const
240 if (!_ffmpeg_content->subtitle_stream ()) {
244 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
248 FFmpeg::avio_read (uint8_t* buffer, int const amount)
250 return _file_group.read (buffer, amount);
254 FFmpeg::avio_seek (int64_t const pos, int whence)
256 if (whence == AVSEEK_SIZE) {
257 return _file_group.length ();
260 return _file_group.seek (pos, whence);
264 FFmpeg::subtitle_period (AVSubtitle const & sub)
266 ContentTime const packet_time = ContentTime::from_seconds (static_cast<double> (sub.pts) / AV_TIME_BASE);
268 if (sub.end_display_time == static_cast<uint32_t> (-1)) {
269 /* End time is not known */
270 return FFmpegSubtitlePeriod (packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3));
273 return FFmpegSubtitlePeriod (
274 packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3),
275 packet_time + ContentTime::from_seconds (sub.end_display_time / 1e3)
279 /** Compute the pts offset to use given a set of audio streams and some video details.
280 * Sometimes these parameters will have just been determined by an Examiner, sometimes
281 * they will have been retrieved from a piece of Content, hence the need for this method
285 FFmpeg::pts_offset (vector<shared_ptr<FFmpegAudioStream> > audio_streams, optional<ContentTime> first_video, double video_frame_rate) const
287 /* Audio and video frame PTS values may not start with 0. We want
288 to fiddle them so that:
290 1. One of them starts at time 0.
291 2. The first video PTS value ends up on a frame boundary.
293 Then we remove big initial gaps in PTS and we allow our
294 insertion of black frames to work.
297 audio_pts_to_use = audio_pts_from_ffmpeg + pts_offset;
298 video_pts_to_use = video_pts_from_ffmpeg + pts_offset;
301 /* First, make one of them start at 0 */
303 ContentTime po = ContentTime::min ();
306 po = - first_video.get ();
309 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, audio_streams) {
310 if (i->first_audio) {
311 po = max (po, - i->first_audio.get ());
315 /* If the offset is positive we would be pushing things from a -ve PTS to be played.
316 I don't think we ever want to do that, as it seems things at -ve PTS are not meant
317 to be seen (use for alignment bars etc.); see mantis #418.
319 if (po > ContentTime ()) {
323 /* Now adjust so that the video pts starts on a frame */
325 ContentTime const fvc = first_video.get() + po;
326 po += fvc.ceil (video_frame_rate) - fvc;