2 Copyright (C) 2013-2014 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 <libavcodec/avcodec.h>
22 #include <libavformat/avformat.h>
23 #include <libswscale/swscale.h>
25 #include <dcp/raw_convert.h>
27 #include "ffmpeg_content.h"
28 #include "ffmpeg_audio_stream.h"
29 #include "ffmpeg_subtitle_stream.h"
30 #include "exceptions.h"
37 using boost::shared_ptr;
38 using dcp::raw_convert;
40 boost::mutex FFmpeg::_mutex;
42 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
45 , _avio_buffer_size (4096)
57 boost::mutex::scoped_lock lm (_mutex);
59 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
60 avcodec_close (_format_context->streams[i]->codec);
63 av_frame_free (&_frame);
64 avformat_close_input (&_format_context);
68 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
70 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
74 avio_seek_wrapper (void* data, int64_t offset, int whence)
76 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
80 FFmpeg::setup_general ()
84 _file_group.set_paths (_ffmpeg_content->paths ());
85 _avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc (_avio_buffer_size));
86 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
87 _format_context = avformat_alloc_context ();
88 _format_context->pb = _avio_context;
90 AVDictionary* options = 0;
91 /* These durations are in microseconds, and represent how far into the content file
92 we will look for streams.
94 av_dict_set (&options, "analyzeduration", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
95 av_dict_set (&options, "probesize", raw_convert<string> (5 * 60 * 1000000).c_str(), 0);
97 if (avformat_open_input (&_format_context, 0, 0, &options) < 0) {
98 throw OpenFileError (_ffmpeg_content->path(0).string ());
101 if (avformat_find_stream_info (_format_context, 0) < 0) {
102 throw DecodeError (_("could not find stream information"));
105 /* Find video stream */
107 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
108 AVStream* s = _format_context->streams[i];
109 /* Files from iTunes sometimes have two video streams, one with the avg_frame_rate.num and .den set
110 to zero. Ignore these streams.
112 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO && s->avg_frame_rate.num > 0 && s->avg_frame_rate.den > 0) {
117 if (_video_stream < 0) {
118 throw DecodeError (N_("could not find video stream"));
121 /* Hack: if the AVStreams have zero IDs, put some in. We
122 use the IDs so that we can cope with VOBs, in which streams
123 move about in index but remain with the same ID in different
124 VOBs. However, some files have all-zero IDs, hence this hack.
128 while (i < _format_context->nb_streams && _format_context->streams[i]->id == 0) {
132 if (i == _format_context->nb_streams) {
133 /* Put in our own IDs */
134 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
135 _format_context->streams[i]->id = i;
139 _frame = av_frame_alloc ();
141 throw DecodeError (N_("could not allocate frame"));
146 FFmpeg::setup_decoders ()
148 boost::mutex::scoped_lock lm (_mutex);
150 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
151 AVCodecContext* context = _format_context->streams[i]->codec;
153 AVCodec* codec = avcodec_find_decoder (context->codec_id);
156 /* This option disables decoding of DCA frame footers in our patched version
157 of FFmpeg. I believe these footers are of no use to us, and they can cause
158 problems when FFmpeg fails to decode them (mantis #352).
160 AVDictionary* options = 0;
161 av_dict_set (&options, "disable_footer", "1", 0);
163 if (avcodec_open2 (context, codec, &options) < 0) {
164 throw DecodeError (N_("could not open decoder"));
168 /* We are silently ignoring any failures to find suitable decoders here */
173 FFmpeg::video_codec_context () const
175 return _format_context->streams[_video_stream]->codec;
179 FFmpeg::audio_codec_context () const
181 if (!_ffmpeg_content->audio_stream ()) {
185 return _ffmpeg_content->audio_stream()->stream(_format_context)->codec;
189 FFmpeg::subtitle_codec_context () const
191 if (!_ffmpeg_content->subtitle_stream ()) {
195 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
199 FFmpeg::avio_read (uint8_t* buffer, int const amount)
201 return _file_group.read (buffer, amount);
205 FFmpeg::avio_seek (int64_t const pos, int whence)
207 if (whence == AVSEEK_SIZE) {
208 return _file_group.length ();
211 return _file_group.seek (pos, whence);