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)
53 boost::mutex::scoped_lock lm (_mutex);
55 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
56 AVCodecContext* context = _format_context->streams[i]->codec;
57 if (context->codec_type == AVMEDIA_TYPE_VIDEO || context->codec_type == AVMEDIA_TYPE_AUDIO) {
58 avcodec_close (context);
62 avcodec_free_frame (&_frame);
64 avformat_close_input (&_format_context);
68 FFmpeg::setup_general ()
72 AVDictionary* options = 0;
73 /* These durations are in microseconds, and represent how far into the content file
74 we will look for streams.
76 av_dict_set (&options, "analyzeduration", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
77 av_dict_set (&options, "probesize", lexical_cast<string> (5 * 60 * 1e6).c_str(), 0);
79 if (avformat_open_input (&_format_context, _ffmpeg_content->path().string().c_str(), 0, &options) < 0) {
80 throw OpenFileError (_ffmpeg_content->path().string ());
83 if (avformat_find_stream_info (_format_context, 0) < 0) {
84 throw DecodeError (_("could not find stream information"));
87 /* Find video stream */
89 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
90 AVStream* s = _format_context->streams[i];
91 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
96 if (_video_stream < 0) {
97 throw DecodeError (N_("could not find video stream"));
100 _frame = avcodec_alloc_frame ();
102 throw DecodeError (N_("could not allocate frame"));
107 FFmpeg::setup_video ()
109 boost::mutex::scoped_lock lm (_mutex);
111 AVCodecContext* context = _format_context->streams[_video_stream]->codec;
112 AVCodec* codec = avcodec_find_decoder (context->codec_id);
115 throw DecodeError (_("could not find video decoder"));
118 if (avcodec_open2 (context, codec, 0) < 0) {
119 throw DecodeError (N_("could not open video decoder"));
124 FFmpeg::setup_audio ()
126 boost::mutex::scoped_lock lm (_mutex);
128 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
129 AVCodecContext* context = _format_context->streams[i]->codec;
130 if (context->codec_type != AVMEDIA_TYPE_AUDIO) {
134 AVCodec* codec = avcodec_find_decoder (context->codec_id);
136 throw DecodeError (_("could not find audio decoder"));
139 if (avcodec_open2 (context, codec, 0) < 0) {
140 throw DecodeError (N_("could not open audio decoder"));
147 FFmpeg::video_codec_context () const
149 return _format_context->streams[_video_stream]->codec;
153 FFmpeg::audio_codec_context () const
155 return _format_context->streams[_ffmpeg_content->audio_stream()->id]->codec;