2 Copyright (C) 2013 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>
24 #include <libpostproc/postprocess.h>
27 #include "ffmpeg_content.h"
28 #include "exceptions.h"
34 using std::stringstream;
35 using boost::shared_ptr;
36 using boost::lexical_cast;
38 boost::mutex FFmpeg::_mutex;
40 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c)
43 , _avio_buffer_size (4096)
56 boost::mutex::scoped_lock lm (_mutex);
58 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
59 AVCodecContext* context = _format_context->streams[i]->codec;
60 if (context->codec_type == AVMEDIA_TYPE_VIDEO || context->codec_type == AVMEDIA_TYPE_AUDIO) {
61 avcodec_close (context);
65 avcodec_free_frame (&_frame);
67 avformat_close_input (&_format_context);
71 avio_read_wrapper (void* data, uint8_t* buffer, int amount)
73 return reinterpret_cast<FFmpeg*>(data)->avio_read (buffer, amount);
77 avio_seek_wrapper (void* data, int64_t offset, int whence)
79 return reinterpret_cast<FFmpeg*>(data)->avio_seek (offset, whence);
83 FFmpeg::setup_general ()
87 _file_group.set_paths (_ffmpeg_content->paths ());
88 _avio_buffer = static_cast<uint8_t*> (av_malloc (_avio_buffer_size));
89 _avio_context = avio_alloc_context (_avio_buffer, _avio_buffer_size, 0, this, avio_read_wrapper, 0, avio_seek_wrapper);
90 _format_context = avformat_alloc_context ();
91 _format_context->pb = _avio_context;
93 AVDictionary* options = 0;
94 /* These durations are in microseconds, and represent how far into the content file
95 we will look for streams.
97 av_dict_set (&options, "analyzeduration", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
98 av_dict_set (&options, "probesize", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
100 if (avformat_open_input (&_format_context, 0, 0, &options) < 0) {
101 throw OpenFileError (_ffmpeg_content->path(0).string ());
104 if (avformat_find_stream_info (_format_context, 0) < 0) {
105 throw DecodeError (_("could not find stream information"));
108 /* Find video stream */
110 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
111 AVStream* s = _format_context->streams[i];
112 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
117 if (_video_stream < 0) {
118 throw DecodeError (N_("could not find video stream"));
121 _frame = avcodec_alloc_frame ();
123 throw DecodeError (N_("could not allocate frame"));
128 FFmpeg::setup_video ()
130 boost::mutex::scoped_lock lm (_mutex);
132 AVCodecContext* context = _format_context->streams[_video_stream]->codec;
133 AVCodec* codec = avcodec_find_decoder (context->codec_id);
136 throw DecodeError (_("could not find video decoder"));
139 if (avcodec_open2 (context, codec, 0) < 0) {
140 throw DecodeError (N_("could not open video decoder"));
145 FFmpeg::setup_audio ()
147 boost::mutex::scoped_lock lm (_mutex);
149 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
150 AVCodecContext* context = _format_context->streams[i]->codec;
151 if (context->codec_type != AVMEDIA_TYPE_AUDIO) {
155 AVCodec* codec = avcodec_find_decoder (context->codec_id);
157 throw DecodeError (_("could not find audio decoder"));
160 if (avcodec_open2 (context, codec, 0) < 0) {
161 throw DecodeError (N_("could not open audio decoder"));
168 FFmpeg::video_codec_context () const
170 return _format_context->streams[_video_stream]->codec;
174 FFmpeg::audio_codec_context () const
176 return _ffmpeg_content->audio_stream()->stream(_format_context)->codec;
180 FFmpeg::avio_read (uint8_t* buffer, int const amount)
182 return _file_group.read (buffer, amount);
186 FFmpeg::avio_seek (int64_t const pos, int whence)
188 if (whence == AVSEEK_SIZE) {
189 return _file_group.length ();
192 return _file_group.seek (pos, whence);