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 /** @param long_probe true to do a long probe of the file looking for streams */
41 FFmpeg::FFmpeg (boost::shared_ptr<const FFmpegContent> c, bool long_probe)
47 setup_general (long_probe);
54 boost::mutex::scoped_lock lm (_mutex);
56 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
57 AVCodecContext* context = _format_context->streams[i]->codec;
58 if (context->codec_type == AVMEDIA_TYPE_VIDEO || context->codec_type == AVMEDIA_TYPE_AUDIO) {
59 avcodec_close (context);
63 avcodec_free_frame (&_frame);
65 avformat_close_input (&_format_context);
69 FFmpeg::setup_general (bool long_probe)
73 AVDictionary* options = 0;
75 /* These durations are in microseconds, and represent how far into the content file
76 we will look for streams.
78 av_dict_set (&options, "analyzeduration", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
79 av_dict_set (&options, "probesize", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
82 if (avformat_open_input (&_format_context, _ffmpeg_content->path().string().c_str(), 0, &options) < 0) {
83 throw OpenFileError (_ffmpeg_content->path().string ());
86 if (avformat_find_stream_info (_format_context, 0) < 0) {
87 throw DecodeError (_("could not find stream information"));
90 /* Find video stream */
92 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
93 AVStream* s = _format_context->streams[i];
94 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
99 if (_video_stream < 0) {
100 throw DecodeError (N_("could not find video stream"));
103 _frame = avcodec_alloc_frame ();
105 throw DecodeError (N_("could not allocate frame"));
110 FFmpeg::setup_video ()
112 boost::mutex::scoped_lock lm (_mutex);
114 AVCodecContext* context = _format_context->streams[_video_stream]->codec;
115 AVCodec* codec = avcodec_find_decoder (context->codec_id);
118 throw DecodeError (_("could not find video decoder"));
121 if (avcodec_open2 (context, codec, 0) < 0) {
122 throw DecodeError (N_("could not open video decoder"));
127 FFmpeg::setup_audio ()
129 boost::mutex::scoped_lock lm (_mutex);
131 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
132 AVCodecContext* context = _format_context->streams[i]->codec;
133 if (context->codec_type != AVMEDIA_TYPE_AUDIO) {
137 AVCodec* codec = avcodec_find_decoder (context->codec_id);
139 throw DecodeError (_("could not find audio decoder"));
142 if (avcodec_open2 (context, codec, 0) < 0) {
143 throw DecodeError (N_("could not open audio decoder"));
150 FFmpeg::video_codec_context () const
152 return _format_context->streams[_video_stream]->codec;
156 FFmpeg::audio_codec_context () const
158 return _format_context->streams[_ffmpeg_content->audio_stream()->id]->codec;