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"
31 #include "compose.hpp"
33 #include <dcp/raw_convert.h>
35 #include <libavcodec/avcodec.h>
36 #include <libavformat/avformat.h>
37 #include <libswscale/swscale.h>
39 #include <boost/algorithm/string.hpp>
40 #include <boost/foreach.hpp>
49 using std::shared_ptr;
50 using boost::optional;
51 using dcp::raw_convert;
52 using namespace dcpomatic;
54 boost::mutex FFmpeg::_mutex;
56 FFmpeg::FFmpeg (std::shared_ptr<const FFmpegContent> c)
59 , _avio_buffer_size (4096)
70 boost::mutex::scoped_lock lm (_mutex);
72 DCPOMATIC_DISABLE_WARNINGS
73 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
74 avcodec_close (_format_context->streams[i]->codec);
76 DCPOMATIC_ENABLE_WARNINGS
78 av_frame_free (&_frame);
79 avformat_close_input (&_format_context);
83 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
85 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
89 avio_seek_wrapper (void* data, int64_t offset, int whence)
91 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
95 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
97 if (level > AV_LOG_WARNING) {
102 static int prefix = 0;
103 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
105 boost::algorithm::trim (str);
106 dcpomatic_log->log (String::compose ("FFmpeg: %1", str), LogEntry::TYPE_GENERAL);
110 FFmpeg::setup_general ()
112 /* This might not work too well in some cases of multiple FFmpeg decoders,
113 but it's probably good enough.
115 av_log_set_callback (FFmpeg::ffmpeg_log_callback);
117 _file_group.set_paths (_ffmpeg_content->paths ());
118 _avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc (_avio_buffer_size));
119 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
120 if (!_avio_context) {
121 throw std::bad_alloc ();
123 _format_context = avformat_alloc_context ();
124 if (!_format_context) {
125 throw std::bad_alloc ();
127 _format_context->pb = _avio_context;
129 AVDictionary* options = 0;
130 int e = avformat_open_input (&_format_context, 0, 0, &options);
132 throw OpenFileError (_ffmpeg_content->path(0).string(), e, OpenFileError::READ);
135 if (avformat_find_stream_info (_format_context, 0) < 0) {
136 throw DecodeError (_("could not find stream information"));
139 /* Find video stream */
141 optional<int> video_stream_undefined_frame_rate;
143 DCPOMATIC_DISABLE_WARNINGS
144 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
145 AVStream* s = _format_context->streams[i];
146 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO && avcodec_find_decoder(s->codec->codec_id)) {
147 if (s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
148 /* This is definitely our video stream */
151 /* This is our video stream if we don't get a better offer */
152 video_stream_undefined_frame_rate = i;
156 DCPOMATIC_ENABLE_WARNINGS
158 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
159 to zero. Only use such a stream if there is no alternative.
161 if (!_video_stream && video_stream_undefined_frame_rate) {
162 _video_stream = video_stream_undefined_frame_rate.get();
165 /* Ignore video streams with crazy frame rates. These are usually things like album art on MP3s. */
166 if (_video_stream && av_q2d(av_guess_frame_rate(_format_context, _format_context->streams[_video_stream.get()], 0)) > 1000) {
167 _video_stream = optional<int>();
170 /* Hack: if the AVStreams have duplicate IDs, replace them with our
171 own. We use the IDs so that we can cope with VOBs, in which streams
172 move about in index but remain with the same ID in different
173 VOBs. However, some files have duplicate IDs, hence this hack.
176 bool duplicates = false;
177 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
178 for (uint32_t j = i + 1; j < _format_context->nb_streams; ++j) {
179 if (_format_context->streams[i]->id == _format_context->streams[j]->id) {
186 /* Put in our own IDs */
187 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
188 _format_context->streams[i]->id = i;
192 _frame = av_frame_alloc ();
194 throw DecodeError (N_("could not allocate frame"));
199 FFmpeg::setup_decoders ()
201 boost::mutex::scoped_lock lm (_mutex);
203 DCPOMATIC_DISABLE_WARNINGS
204 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
205 AVCodecContext* context = _format_context->streams[i]->codec;
207 AVCodec* codec = avcodec_find_decoder (context->codec_id);
210 AVDictionary* options = 0;
211 /* This option disables decoding of DCA frame footers in our patched version
212 of FFmpeg. I believe these footers are of no use to us, and they can cause
213 problems when FFmpeg fails to decode them (mantis #352).
215 av_dict_set (&options, "disable_footer", "1", 0);
216 /* This allows decoding of some DNxHR 444 and HQX files; see
217 https://trac.ffmpeg.org/ticket/5681
219 av_dict_set_int (&options, "strict", FF_COMPLIANCE_EXPERIMENTAL, 0);
220 /* Enable following of links in files */
221 av_dict_set_int (&options, "enable_drefs", 1, 0);
223 if (avcodec_open2 (context, codec, &options) < 0) {
224 throw DecodeError (N_("could not open decoder"));
227 dcpomatic_log->log (String::compose ("No codec found for stream %1", i), LogEntry::TYPE_WARNING);
230 DCPOMATIC_ENABLE_WARNINGS
233 DCPOMATIC_DISABLE_WARNINGS
235 FFmpeg::video_codec_context () const
237 if (!_video_stream) {
241 return _format_context->streams[_video_stream.get()]->codec;
245 FFmpeg::subtitle_codec_context () const
247 if (!_ffmpeg_content->subtitle_stream ()) {
251 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
253 DCPOMATIC_ENABLE_WARNINGS
256 FFmpeg::avio_read (uint8_t* buffer, int const amount)
258 return _file_group.read (buffer, amount);
262 FFmpeg::avio_seek (int64_t const pos, int whence)
264 if (whence == AVSEEK_SIZE) {
265 return _file_group.length ();
268 return _file_group.seek (pos, whence);
272 FFmpeg::subtitle_period (AVSubtitle const & sub)
274 ContentTime const packet_time = ContentTime::from_seconds (static_cast<double> (sub.pts) / AV_TIME_BASE);
276 if (sub.end_display_time == static_cast<uint32_t> (-1)) {
277 /* End time is not known */
278 return FFmpegSubtitlePeriod (packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3));
281 return FFmpegSubtitlePeriod (
282 packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3),
283 packet_time + ContentTime::from_seconds (sub.end_display_time / 1e3)
287 /** Compute the pts offset to use given a set of audio streams and some video details.
288 * Sometimes these parameters will have just been determined by an Examiner, sometimes
289 * they will have been retrieved from a piece of Content, hence the need for this method
293 FFmpeg::pts_offset (vector<shared_ptr<FFmpegAudioStream> > audio_streams, optional<ContentTime> first_video, double video_frame_rate) const
295 /* Audio and video frame PTS values may not start with 0. We want
296 to fiddle them so that:
298 1. One of them starts at time 0.
299 2. The first video PTS value ends up on a frame boundary.
301 Then we remove big initial gaps in PTS and we allow our
302 insertion of black frames to work.
305 audio_pts_to_use = audio_pts_from_ffmpeg + pts_offset;
306 video_pts_to_use = video_pts_from_ffmpeg + pts_offset;
309 /* First, make one of them start at 0 */
311 ContentTime po = ContentTime::min ();
314 po = - first_video.get ();
317 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, audio_streams) {
318 if (i->first_audio) {
319 po = max (po, - i->first_audio.get ());
323 /* If the offset is positive we would be pushing things from a -ve PTS to be played.
324 I don't think we ever want to do that, as it seems things at -ve PTS are not meant
325 to be seen (use for alignment bars etc.); see mantis #418.
327 if (po > ContentTime ()) {
331 /* Now adjust so that the video pts starts on a frame */
333 ContentTime const fvc = first_video.get() + po;
334 po += fvc.ceil (video_frame_rate) - fvc;