2 Copyright (C) 2012 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.
20 /** @file src/ffmpeg_decoder.cc
21 * @brief A decoder using FFmpeg to decode content.
32 #include <libavcodec/avcodec.h>
33 #include <libavformat/avformat.h>
34 #include <libswscale/swscale.h>
35 #include <libpostproc/postprocess.h>
40 #include "transcoder.h"
43 #include "film_state.h"
45 #include "exceptions.h"
49 #include "ffmpeg_decoder.h"
52 using namespace boost;
54 FFmpegDecoder::FFmpegDecoder (boost::shared_ptr<const FilmState> s, boost::shared_ptr<const Options> o, Job* j, Log* l, bool minimal, bool ignore_length)
55 : Decoder (s, o, j, l, minimal, ignore_length)
60 , _video_codec_context (0)
62 , _audio_codec_context (0)
70 FFmpegDecoder::~FFmpegDecoder ()
72 if (_audio_codec_context) {
73 avcodec_close (_audio_codec_context);
76 if (_video_codec_context) {
77 avcodec_close (_video_codec_context);
81 avformat_close_input (&_format_context);
85 FFmpegDecoder::setup_general ()
91 if ((r = avformat_open_input (&_format_context, _fs->content_path().c_str(), 0, 0)) != 0) {
92 throw OpenFileError (_fs->content_path ());
95 if (avformat_find_stream_info (_format_context, 0) < 0) {
96 throw DecodeError ("could not find stream information");
99 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
100 if (_format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
102 } else if (_format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
107 if (_video_stream < 0) {
108 throw DecodeError ("could not find video stream");
111 _frame = avcodec_alloc_frame ();
113 throw DecodeError ("could not allocate frame");
118 FFmpegDecoder::setup_video ()
120 _video_codec_context = _format_context->streams[_video_stream]->codec;
121 _video_codec = avcodec_find_decoder (_video_codec_context->codec_id);
123 if (_video_codec == 0) {
124 throw DecodeError ("could not find video decoder");
127 if (avcodec_open2 (_video_codec_context, _video_codec, 0) < 0) {
128 throw DecodeError ("could not open video decoder");
133 FFmpegDecoder::setup_audio ()
135 if (_audio_stream < 0) {
139 _audio_codec_context = _format_context->streams[_audio_stream]->codec;
140 _audio_codec = avcodec_find_decoder (_audio_codec_context->codec_id);
142 if (_audio_codec == 0) {
143 throw DecodeError ("could not find audio decoder");
146 if (avcodec_open2 (_audio_codec_context, _audio_codec, 0) < 0) {
147 throw DecodeError ("could not open audio decoder");
152 FFmpegDecoder::do_pass ()
154 int r = av_read_frame (_format_context, &_packet);
159 if (_packet.stream_index == _video_stream && _opt->decode_video) {
162 if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
163 process_video (_frame);
166 } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio) {
168 avcodec_get_frame_defaults (_frame);
171 if (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
172 int const data_size = av_samples_get_buffer_size (
173 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
176 assert (_audio_codec_context->channels == _fs->audio_channels);
177 process_audio (_frame->data[0], data_size);
181 av_free_packet (&_packet);
186 FFmpegDecoder::length_in_frames () const
188 return (_format_context->duration / AV_TIME_BASE) * frames_per_second ();
192 FFmpegDecoder::frames_per_second () const
194 return av_q2d (_format_context->streams[_video_stream]->avg_frame_rate);
198 FFmpegDecoder::audio_channels () const
200 if (_audio_codec_context == 0) {
204 return _audio_codec_context->channels;
208 FFmpegDecoder::audio_sample_rate () const
210 if (_audio_codec_context == 0) {
214 return _audio_codec_context->sample_rate;
218 FFmpegDecoder::audio_sample_format () const
220 if (_audio_codec_context == 0) {
221 return (AVSampleFormat) 0;
224 return _audio_codec_context->sample_fmt;
228 FFmpegDecoder::audio_channel_layout () const
230 if (_audio_codec_context == 0) {
234 return _audio_codec_context->channel_layout;
238 FFmpegDecoder::native_size () const
240 return Size (_video_codec_context->width, _video_codec_context->height);
244 FFmpegDecoder::pixel_format () const
246 return _video_codec_context->pix_fmt;
250 FFmpegDecoder::time_base_numerator () const
252 return _video_codec_context->time_base.num;
256 FFmpegDecoder::time_base_denominator () const
258 return _video_codec_context->time_base.den;
262 FFmpegDecoder::sample_aspect_ratio_numerator () const
264 return _video_codec_context->sample_aspect_ratio.num;
268 FFmpegDecoder::sample_aspect_ratio_denominator () const
270 return _video_codec_context->sample_aspect_ratio.den;