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);
155 if (avcodec_open2 (context, codec, 0) < 0) {
156 throw DecodeError (N_("could not open decoder"));
160 /* We are silently ignoring any failures to find suitable decoders here */
165 FFmpeg::video_codec_context () const
167 return _format_context->streams[_video_stream]->codec;
171 FFmpeg::audio_codec_context () const
173 if (!_ffmpeg_content->audio_stream ()) {
177 return _ffmpeg_content->audio_stream()->stream(_format_context)->codec;
181 FFmpeg::subtitle_codec_context () const
183 if (!_ffmpeg_content->subtitle_stream ()) {
187 return _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
191 FFmpeg::avio_read (uint8_t* buffer, int const amount)
193 return _file_group.read (buffer, amount);
197 FFmpeg::avio_seek (int64_t const pos, int whence)
199 if (whence == AVSEEK_SIZE) {
200 return _file_group.length ();
203 return _file_group.seek (pos, whence);