2 Copyright (C) 2013-2015 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 "ffmpeg_audio_stream.h"
24 #include "ffmpeg_subtitle_stream.h"
25 #include "exceptions.h"
27 #include "raw_convert.h"
30 #include <libavcodec/avcodec.h>
31 #include <libavformat/avformat.h>
32 #include <libswscale/swscale.h>
34 #include <boost/algorithm/string.hpp>
41 using boost::shared_ptr;
43 boost::mutex FFmpeg::_mutex;
44 boost::weak_ptr<Log> FFmpeg::_ffmpeg_log;
46 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
49 , _avio_buffer_size (4096)
61 boost::mutex::scoped_lock lm (_mutex);
63 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
64 avcodec_close (_format_context->streams[i]->codec);
67 av_frame_free (&_frame);
68 avformat_close_input (&_format_context);
72 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
74 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
78 avio_seek_wrapper (void* data, int64_t offset, int whence)
80 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
84 FFmpeg::ffmpeg_log_callback (void* ptr, int level, const char* fmt, va_list vl)
86 if (level > AV_LOG_WARNING) {
91 static int prefix = 0;
92 av_log_format_line (ptr, level, fmt, vl, line, sizeof (line), &prefix);
93 shared_ptr<Log> log = _ffmpeg_log.lock ();
96 boost::algorithm::trim (str);
97 log->log (String::compose ("FFmpeg: %1", str), Log::TYPE_GENERAL);
104 FFmpeg::setup_general ()
108 /* This might not work too well in some cases of multiple FFmpeg decoders,
109 but it's probably good enough.
111 _ffmpeg_log = _ffmpeg_content->film()->log ();
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);
127 if (avformat_open_input (&_format_context, 0, 0, &options) < 0) {
128 throw OpenFileError (_ffmpeg_content->path(0).string ());
131 if (avformat_find_stream_info (_format_context, 0) < 0) {
132 throw DecodeError (_("could not find stream information"));
135 /* Find video stream */
137 int video_stream_undefined_frame_rate = -1;
139 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
140 AVStream* s = _format_context->streams[i];
141 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
142 if (s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
143 /* This is definitely our video stream */
146 /* This is our video stream if we don't get a better offer */
147 video_stream_undefined_frame_rate = i;
152 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
153 to zero. Only use such a stream if there is no alternative.
155 if (_video_stream == -1 && video_stream_undefined_frame_rate != -1) {
156 _video_stream = video_stream_undefined_frame_rate;
159 if (_video_stream < 0) {
160 throw DecodeError (N_("could not find video stream"));
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 /* This option disables decoding of DCA frame footers in our patched version
203 of FFmpeg. I believe these footers are of no use to us, and they can cause
204 problems when FFmpeg fails to decode them (mantis #352).
206 AVDictionary* options = 0;
207 av_dict_set (&options, "disable_footer", "1", 0);
209 if (avcodec_open2 (context, codec, &options) < 0) {
210 throw DecodeError (N_("could not open decoder"));
214 /* We are silently ignoring any failures to find suitable decoders here */
219 FFmpeg::video_codec_context () const
221 return _format_context->streams[_video_stream]->codec;
225 FFmpeg::subtitle_codec_context () const
227 if (!_ffmpeg_content->subtitle_stream ()) {
231 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
235 FFmpeg::avio_read (uint8_t* buffer, int const amount)
237 return _file_group.read (buffer, amount);
241 FFmpeg::avio_seek (int64_t const pos, int whence)
243 if (whence == AVSEEK_SIZE) {
244 return _file_group.length ();
247 return _file_group.seek (pos, whence);