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 "ffmpeg_subtitle_stream.h"
28 #include "ffmpeg_audio_stream.h"
30 #include "compose.hpp"
31 #include <dcp/raw_convert.h>
33 #include <libavcodec/avcodec.h>
34 #include <libavformat/avformat.h>
35 #include <libswscale/swscale.h>
37 #include <boost/algorithm/string.hpp>
38 #include <boost/foreach.hpp>
47 using boost::shared_ptr;
48 using boost::optional;
49 using dcp::raw_convert;
51 boost::mutex FFmpeg::_mutex;
52 boost::weak_ptr<Log> FFmpeg::_ffmpeg_log;
54 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
57 , _avio_buffer_size (4096)
68 boost::mutex::scoped_lock lm (_mutex);
70 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
71 avcodec_close (_format_context->streams[i]->codec);
74 av_frame_free (&_frame);
75 avformat_close_input (&_format_context);
79 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
81 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
85 avio_seek_wrapper (void* data, int64_t offset, int whence)
87 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
91 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
93 if (level > AV_LOG_WARNING) {
98 static int prefix = 0;
99 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
100 shared_ptr<Log> log = _ffmpeg_log.lock ();
103 boost::algorithm::trim (str);
104 log->log (String::compose ("FFmpeg: %1", str), LogEntry::TYPE_GENERAL);
111 FFmpeg::setup_general ()
113 /* This might not work too well in some cases of multiple FFmpeg decoders,
114 but it's probably good enough.
116 _ffmpeg_log = _ffmpeg_content->film()->log ();
117 av_log_set_callback (FFmpeg::ffmpeg_log_callback);
119 _file_group.set_paths (_ffmpeg_content->paths ());
120 _avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc (_avio_buffer_size));
121 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
122 _format_context = avformat_alloc_context ();
123 _format_context->pb = _avio_context;
125 AVDictionary* options = 0;
126 /* These durations are in microseconds, and represent how far into the content file
127 we will look for streams.
129 av_dict_set (&options, "analyzeduration", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
130 av_dict_set (&options, "probesize", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
132 int e = avformat_open_input (&_format_context, 0, 0, &options);
134 throw OpenFileError (_ffmpeg_content->path(0).string(), e, true);
137 if (avformat_find_stream_info (_format_context, 0) < 0) {
138 throw DecodeError (_("could not find stream information"));
141 /* Find video stream */
143 optional<int> video_stream_undefined_frame_rate;
145 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
146 AVStream* s = _format_context->streams[i];
147 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO && avcodec_find_decoder(s->codec->codec_id)) {
148 if (s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
149 /* This is definitely our video stream */
152 /* This is our video stream if we don't get a better offer */
153 video_stream_undefined_frame_rate = i;
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 /* Hack: if the AVStreams have duplicate IDs, replace them with our
166 own. We use the IDs so that we can cope with VOBs, in which streams
167 move about in index but remain with the same ID in different
168 VOBs. However, some files have duplicate IDs, hence this hack.
171 bool duplicates = false;
172 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
173 for (uint32_t j = i + 1; j < _format_context->nb_streams; ++j) {
174 if (_format_context->streams[i]->id == _format_context->streams[j]->id) {
181 /* Put in our own IDs */
182 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
183 _format_context->streams[i]->id = i;
187 _frame = av_frame_alloc ();
189 throw DecodeError (N_("could not allocate frame"));
194 FFmpeg::setup_decoders ()
196 boost::mutex::scoped_lock lm (_mutex);
198 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
199 AVCodecContext* context = _format_context->streams[i]->codec;
201 AVCodec* codec = avcodec_find_decoder (context->codec_id);
204 AVDictionary* options = 0;
205 /* This option disables decoding of DCA frame footers in our patched version
206 of FFmpeg. I believe these footers are of no use to us, and they can cause
207 problems when FFmpeg fails to decode them (mantis #352).
209 av_dict_set (&options, "disable_footer", "1", 0);
210 /* This allows decoding of some DNxHR 444 and HQX files; see
211 https://trac.ffmpeg.org/ticket/5681
213 av_dict_set_int (&options, "strict", FF_COMPLIANCE_EXPERIMENTAL, 0);
215 if (avcodec_open2 (context, codec, &options) < 0) {
216 throw DecodeError (N_("could not open decoder"));
219 shared_ptr<Log> log = _ffmpeg_log.lock ();
221 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;