2 Copyright (C) 2013-2016 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include "ffmpeg_content.h"
23 #include "exceptions.h"
25 #include "raw_convert.h"
27 #include "ffmpeg_subtitle_stream.h"
28 #include "ffmpeg_audio_stream.h"
29 #include "md5_digester.h"
30 #include "compose.hpp"
32 #include <libavcodec/avcodec.h>
33 #include <libavformat/avformat.h>
34 #include <libswscale/swscale.h>
36 #include <boost/algorithm/string.hpp>
37 #include <boost/foreach.hpp>
46 using boost::shared_ptr;
47 using boost::optional;
49 boost::mutex FFmpeg::_mutex;
50 boost::weak_ptr<Log> FFmpeg::_ffmpeg_log;
52 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
55 , _avio_buffer_size (4096)
66 boost::mutex::scoped_lock lm (_mutex);
68 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
69 avcodec_close (_format_context->streams[i]->codec);
72 av_frame_free (&_frame);
73 avformat_close_input (&_format_context);
77 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
79 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
83 avio_seek_wrapper (void* data, int64_t offset, int whence)
85 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
89 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
91 if (level > AV_LOG_WARNING) {
96 static int prefix = 0;
97 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
98 shared_ptr<Log> log = _ffmpeg_log.lock ();
101 boost::algorithm::trim (str);
102 log->log (String::compose ("FFmpeg: %1", str), LogEntry::TYPE_GENERAL);
109 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 if (avformat_open_input (&_format_context, 0, 0, &options) < 0) {
133 throw OpenFileError (_ffmpeg_content->path(0).string ());
136 if (avformat_find_stream_info (_format_context, 0) < 0) {
137 throw DecodeError (_("could not find stream information"));
140 /* Find video stream */
142 optional<int> video_stream_undefined_frame_rate;
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) {
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;
157 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
158 to zero. Only use such a stream if there is no alternative.
160 if (!_video_stream && video_stream_undefined_frame_rate) {
161 _video_stream = video_stream_undefined_frame_rate.get();
164 /* Hack: if the AVStreams have duplicate IDs, replace them with our
165 own. We use the IDs so that we can cope with VOBs, in which streams
166 move about in index but remain with the same ID in different
167 VOBs. However, some files have duplicate IDs, hence this hack.
170 bool duplicates = false;
171 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
172 for (uint32_t j = i + 1; j < _format_context->nb_streams; ++j) {
173 if (_format_context->streams[i]->id == _format_context->streams[j]->id) {
180 /* Put in our own IDs */
181 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
182 _format_context->streams[i]->id = i;
186 _frame = av_frame_alloc ();
188 throw DecodeError (N_("could not allocate frame"));
193 FFmpeg::setup_decoders ()
195 boost::mutex::scoped_lock lm (_mutex);
197 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
198 AVCodecContext* context = _format_context->streams[i]->codec;
200 AVCodec* codec = avcodec_find_decoder (context->codec_id);
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 AVDictionary* options = 0;
208 av_dict_set (&options, "disable_footer", "1", 0);
210 if (avcodec_open2 (context, codec, &options) < 0) {
211 throw DecodeError (N_("could not open decoder"));
215 /* We are silently ignoring any failures to find suitable decoders here */
220 FFmpeg::video_codec_context () const
222 DCPOMATIC_ASSERT (_video_stream);
223 return _format_context->streams[_video_stream.get()]->codec;
227 FFmpeg::subtitle_codec_context () const
229 if (!_ffmpeg_content->subtitle_stream ()) {
233 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
237 FFmpeg::avio_read (uint8_t* buffer, int const amount)
239 return _file_group.read (buffer, amount);
243 FFmpeg::avio_seek (int64_t const pos, int whence)
245 if (whence == AVSEEK_SIZE) {
246 return _file_group.length ();
249 return _file_group.seek (pos, whence);
253 FFmpeg::subtitle_period (AVSubtitle const & sub)
255 ContentTime const packet_time = ContentTime::from_seconds (static_cast<double> (sub.pts) / AV_TIME_BASE);
257 if (sub.end_display_time == static_cast<uint32_t> (-1)) {
258 /* End time is not known */
259 return FFmpegSubtitlePeriod (packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3));
262 return FFmpegSubtitlePeriod (
263 packet_time + ContentTime::from_seconds (sub.start_display_time / 1e3),
264 packet_time + ContentTime::from_seconds (sub.end_display_time / 1e3)
269 FFmpeg::subtitle_id (AVSubtitle const & sub)
271 MD5Digester digester;
272 digester.add (sub.pts);
273 for (unsigned int i = 0; i < sub.num_rects; ++i) {
274 AVSubtitleRect* rect = sub.rects[i];
275 digester.add (rect->x);
276 digester.add (rect->y);
277 digester.add (rect->w);
278 digester.add (rect->h);
279 #ifdef DCPOMATIC_HAVE_AVSUBTITLERECT_PICT
280 int const line = rect->pict.linesize[0];
281 for (int j = 0; j < rect->h; ++j) {
282 digester.add (rect->pict.data[0] + j * line, line);
285 int const line = rect->linesize[0];
286 for (int j = 0; j < rect->h; ++j) {
287 digester.add (rect->data[0] + j * line, line);
291 return digester.get ();
294 /** @return true if sub starts a new image subtitle */
296 FFmpeg::subtitle_starts_image (AVSubtitle const & sub)
301 for (unsigned int i = 0; i < sub.num_rects; ++i) {
302 switch (sub.rects[i]->type) {
303 case SUBTITLE_BITMAP:
315 /* We can't cope with mixed image/text in one AVSubtitle */
316 DCPOMATIC_ASSERT (!image || !text);
321 /** Compute the pts offset to use given a set of audio streams and some video details.
322 * Sometimes these parameters will have just been determined by an Examiner, sometimes
323 * they will have been retrieved from a piece of Content, hence the need for this method
327 FFmpeg::pts_offset (vector<shared_ptr<FFmpegAudioStream> > audio_streams, optional<ContentTime> first_video, double video_frame_rate) const
329 /* Audio and video frame PTS values may not start with 0. We want
330 to fiddle them so that:
332 1. One of them starts at time 0.
333 2. The first video PTS value ends up on a frame boundary.
335 Then we remove big initial gaps in PTS and we allow our
336 insertion of black frames to work.
339 audio_pts_to_use = audio_pts_from_ffmpeg + pts_offset;
340 video_pts_to_use = video_pts_from_ffmpeg + pts_offset;
343 /* First, make one of them start at 0 */
345 ContentTime po = ContentTime::min ();
348 po = - first_video.get ();
351 BOOST_FOREACH (shared_ptr<FFmpegAudioStream> i, audio_streams) {
352 if (i->first_audio) {
353 po = max (po, - i->first_audio.get ());
357 /* If the offset is positive we would be pushing things from a -ve PTS to be played.
358 I don't think we ever want to do that, as it seems things at -ve PTS are not meant
359 to be seen (use for alignment bars etc.); see mantis #418.
361 if (po > ContentTime ()) {
365 /* Now adjust so that the video pts starts on a frame */
367 ContentTime const fvc = first_video.get() + po;
368 po += fvc.round_up (video_frame_rate) - fvc;