2 Copyright (C) 2013-2016 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"
32 #include <dcp/raw_convert.h>
34 #include <libavcodec/avcodec.h>
35 #include <libavformat/avformat.h>
36 #include <libswscale/swscale.h>
38 #include <boost/algorithm/string.hpp>
39 #include <boost/foreach.hpp>
48 using boost::shared_ptr;
49 using boost::optional;
50 using dcp::raw_convert;
51 using namespace dcpomatic;
53 boost::mutex FFmpeg::_mutex;
55 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
58 , _avio_buffer_size (4096)
69 boost::mutex::scoped_lock lm (_mutex);
71 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
72 avcodec_close (_format_context->streams[i]->codec);
75 av_frame_free (&_frame);
76 avformat_close_input (&_format_context);
80 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
82 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
86 avio_seek_wrapper (void* data, int64_t offset, int whence)
88 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
92 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
94 if (level > AV_LOG_WARNING) {
99 static int prefix = 0;
100 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
102 boost::algorithm::trim (str);
103 dcpomatic_log->log (String::compose ("FFmpeg: %1", str), LogEntry::TYPE_GENERAL);
107 FFmpeg::setup_general ()
109 /* This might not work too well in some cases of multiple FFmpeg decoders,
110 but it's probably good enough.
112 av_log_set_callback (FFmpeg::ffmpeg_log_callback);
114 _file_group.set_paths (_ffmpeg_content->paths ());
115 _avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc (_avio_buffer_size));
116 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
117 _format_context = avformat_alloc_context ();
118 _format_context->pb = _avio_context;
120 AVDictionary* options = 0;
121 /* These durations are in microseconds, and represent how far into the content file
122 we will look for streams.
124 av_dict_set (&options, "analyzeduration", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
125 av_dict_set (&options, "probesize", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
126 if (_ffmpeg_content->decryption_key()) {
127 av_dict_set (&options, "decryption_key", _ffmpeg_content->decryption_key()->c_str(), 0);
130 int e = avformat_open_input (&_format_context, 0, 0, &options);
132 throw OpenFileError (_ffmpeg_content->path(0).string(), e, true);
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 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
144 AVStream* s = _format_context->streams[i];
145 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO && avcodec_find_decoder(s->codec->codec_id)) {
146 if (s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
147 /* This is definitely our video stream */
150 /* This is our video stream if we don't get a better offer */
151 video_stream_undefined_frame_rate = i;
156 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
157 to zero. Only use such a stream if there is no alternative.
159 if (!_video_stream && video_stream_undefined_frame_rate) {
160 _video_stream = video_stream_undefined_frame_rate.get();
163 /* Hack: if the AVStreams have duplicate IDs, replace them with our
164 own. We use the IDs so that we can cope with VOBs, in which streams
165 move about in index but remain with the same ID in different
166 VOBs. However, some files have duplicate IDs, hence this hack.
169 bool duplicates = false;
170 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
171 for (uint32_t j = i + 1; j < _format_context->nb_streams; ++j) {
172 if (_format_context->streams[i]->id == _format_context->streams[j]->id) {
179 /* Put in our own IDs */
180 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
181 _format_context->streams[i]->id = i;
185 _frame = av_frame_alloc ();
187 throw DecodeError (N_("could not allocate frame"));
192 FFmpeg::setup_decoders ()
194 boost::mutex::scoped_lock lm (_mutex);
196 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
197 AVCodecContext* context = _format_context->streams[i]->codec;
199 AVCodec* codec = avcodec_find_decoder (context->codec_id);
202 AVDictionary* options = 0;
203 /* This option disables decoding of DCA frame footers in our patched version
204 of FFmpeg. I believe these footers are of no use to us, and they can cause
205 problems when FFmpeg fails to decode them (mantis #352).
207 av_dict_set (&options, "disable_footer", "1", 0);
208 /* This allows decoding of some DNxHR 444 and HQX files; see
209 https://trac.ffmpeg.org/ticket/5681
211 av_dict_set_int (&options, "strict", FF_COMPLIANCE_EXPERIMENTAL, 0);
212 /* Enable following of links in files */
213 av_dict_set_int (&options, "enable_drefs", 1, 0);
215 if (avcodec_open2 (context, codec, &options) < 0) {
216 throw DecodeError (N_("could not open decoder"));
219 dcpomatic_log->log (String::compose ("No codec found for stream %1", i), LogEntry::TYPE_WARNING);
225 FFmpeg::video_codec_context () const
227 if (!_video_stream) {
231 return _format_context->streams[_video_stream.get()]->codec;
235 FFmpeg::subtitle_codec_context () const
237 if (!_ffmpeg_content->subtitle_stream ()) {
241 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
245 FFmpeg::avio_read (uint8_t* buffer, int const amount)
247 return _file_group.read (buffer, amount);
251 FFmpeg::avio_seek (int64_t const pos, int whence)
253 if (whence == AVSEEK_SIZE) {
254 return _file_group.length ();
257 return _file_group.seek (pos, whence);
261 FFmpeg::subtitle_period (AVSubtitle const & sub)
263 ContentTime const packet_time = ContentTime::from_seconds (static_cast<double> (sub.pts) / AV_TIME_BASE);
265 if (sub.end_display_time == static_cast<uint32_t> (-1)) {
266 /* End time is not known */
267 return FFmpegSubtitlePeriod (packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3));
270 return FFmpegSubtitlePeriod (
271 packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3),
272 packet_time + ContentTime::from_seconds (sub.end_display_time / 1e3)
276 /** Compute the pts offset to use given a set of audio streams and some video details.
277 * Sometimes these parameters will have just been determined by an Examiner, sometimes
278 * they will have been retrieved from a piece of Content, hence the need for this method
282 FFmpeg::pts_offset (vector<shared_ptr<FFmpegAudioStream> > audio_streams, optional<ContentTime> first_video, double video_frame_rate) const
284 /* Audio and video frame PTS values may not start with 0. We want
285 to fiddle them so that:
287 1. One of them starts at time 0.
288 2. The first video PTS value ends up on a frame boundary.
290 Then we remove big initial gaps in PTS and we allow our
291 insertion of black frames to work.
294 audio_pts_to_use = audio_pts_from_ffmpeg + pts_offset;
295 video_pts_to_use = video_pts_from_ffmpeg + pts_offset;
298 /* First, make one of them start at 0 */
300 ContentTime po = ContentTime::min ();
303 po = - first_video.get ();
306 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, audio_streams) {
307 if (i->first_audio) {
308 po = max (po, - i->first_audio.get ());
312 /* If the offset is positive we would be pushing things from a -ve PTS to be played.
313 I don't think we ever want to do that, as it seems things at -ve PTS are not meant
314 to be seen (use for alignment bars etc.); see mantis #418.
316 if (po > ContentTime ()) {
320 /* Now adjust so that the video pts starts on a frame */
322 ContentTime const fvc = first_video.get() + po;
323 po += fvc.ceil (video_frame_rate) - fvc;