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.
30 #include <boost/lexical_cast.hpp>
33 #include <libavcodec/avcodec.h>
34 #include <libavformat/avformat.h>
35 #include <libswscale/swscale.h>
36 #include <libpostproc/postprocess.h>
41 #include "transcoder.h"
44 #include "film_state.h"
46 #include "exceptions.h"
50 #include "ffmpeg_decoder.h"
54 using namespace boost;
56 FFmpegDecoder::FFmpegDecoder (boost::shared_ptr<const FilmState> s, boost::shared_ptr<const Options> o, Job* j, Log* l, bool minimal, bool ignore_length)
57 : Decoder (s, o, j, l, minimal, ignore_length)
61 , _subtitle_stream (-1)
63 , _video_codec_context (0)
65 , _audio_codec_context (0)
67 , _subtitle_codec_context (0)
76 FFmpegDecoder::~FFmpegDecoder ()
78 if (_audio_codec_context) {
79 avcodec_close (_audio_codec_context);
82 if (_video_codec_context) {
83 avcodec_close (_video_codec_context);
86 if (_subtitle_codec_context) {
87 avcodec_close (_subtitle_codec_context);
91 avformat_close_input (&_format_context);
95 FFmpegDecoder::setup_general ()
101 if ((r = avformat_open_input (&_format_context, _fs->content_path().c_str(), 0, 0)) != 0) {
102 throw OpenFileError (_fs->content_path ());
105 if (avformat_find_stream_info (_format_context, 0) < 0) {
106 throw DecodeError ("could not find stream information");
109 /* Find video, audio and subtitle streams and choose the first of each */
111 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
112 AVStream* s = _format_context->streams[i];
113 if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
115 } else if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
116 if (_audio_stream == -1) {
119 _audio_streams.push_back (AudioStream (stream_name (s), i, s->codec->channels));
120 } else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
121 if (_subtitle_stream == -1) {
122 _subtitle_stream = i;
124 _subtitle_streams.push_back (SubtitleStream (stream_name (s), i));
128 /* Now override audio and subtitle streams with those from the Film, if it has any */
130 if (_fs->audio_stream_index() != -1) {
131 _audio_stream = _fs->audio_stream().id();
134 if (_fs->subtitle_stream_index() != -1) {
135 _subtitle_stream = _fs->subtitle_stream().id ();
138 if (_video_stream < 0) {
139 throw DecodeError ("could not find video stream");
142 _frame = avcodec_alloc_frame ();
144 throw DecodeError ("could not allocate frame");
149 FFmpegDecoder::setup_video ()
151 _video_codec_context = _format_context->streams[_video_stream]->codec;
152 _video_codec = avcodec_find_decoder (_video_codec_context->codec_id);
154 if (_video_codec == 0) {
155 throw DecodeError ("could not find video decoder");
158 if (avcodec_open2 (_video_codec_context, _video_codec, 0) < 0) {
159 throw DecodeError ("could not open video decoder");
164 FFmpegDecoder::setup_audio ()
166 if (_audio_stream < 0) {
170 _audio_codec_context = _format_context->streams[_audio_stream]->codec;
171 _audio_codec = avcodec_find_decoder (_audio_codec_context->codec_id);
173 if (_audio_codec == 0) {
174 throw DecodeError ("could not find audio decoder");
177 if (avcodec_open2 (_audio_codec_context, _audio_codec, 0) < 0) {
178 throw DecodeError ("could not open audio decoder");
181 /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
182 so bodge it here. No idea why we should have to do this.
185 if (_audio_codec_context->channel_layout == 0) {
186 _audio_codec_context->channel_layout = av_get_default_channel_layout (audio_channels ());
191 FFmpegDecoder::setup_subtitle ()
193 if (_subtitle_stream < 0) {
197 _subtitle_codec_context = _format_context->streams[_subtitle_stream]->codec;
198 _subtitle_codec = avcodec_find_decoder (_subtitle_codec_context->codec_id);
200 if (_subtitle_codec == 0) {
201 throw DecodeError ("could not find subtitle decoder");
204 if (avcodec_open2 (_subtitle_codec_context, _subtitle_codec, 0) < 0) {
205 throw DecodeError ("could not open subtitle decoder");
211 FFmpegDecoder::do_pass ()
213 int r = av_read_frame (_format_context, &_packet);
215 if (r != AVERROR_EOF) {
216 throw DecodeError ("error on av_read_frame");
219 /* Get any remaining frames */
226 while (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
227 process_video (_frame);
230 if (_audio_stream >= 0 && _opt->decode_audio) {
231 while (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
232 int const data_size = av_samples_get_buffer_size (
233 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
236 assert (_audio_codec_context->channels == _fs->audio_channels());
237 process_audio (_frame->data[0], data_size);
244 if (_packet.stream_index == _video_stream) {
247 if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
248 process_video (_frame);
251 } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio) {
253 avcodec_get_frame_defaults (_frame);
256 if (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
257 int const data_size = av_samples_get_buffer_size (
258 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
261 assert (_audio_codec_context->channels == _fs->audio_channels());
262 process_audio (_frame->data[0], data_size);
265 } else if (_subtitle_stream >= 0 && _packet.stream_index == _subtitle_stream && _opt->decode_subtitles) {
269 if (avcodec_decode_subtitle2 (_subtitle_codec_context, &sub, &got_subtitle, &_packet) && got_subtitle) {
270 /* I'm not entirely sure why, but sometimes we get an AVSubtitle with
273 if (sub.num_rects > 0) {
274 process_subtitle (shared_ptr<TimedSubtitle> (new TimedSubtitle (sub)));
276 avsubtitle_free (&sub);
280 av_free_packet (&_packet);
285 FFmpegDecoder::length_in_frames () const
287 return (_format_context->duration / AV_TIME_BASE) * frames_per_second ();
291 FFmpegDecoder::frames_per_second () const
293 AVStream* s = _format_context->streams[_video_stream];
295 if (s->avg_frame_rate.num && s->avg_frame_rate.den) {
296 return av_q2d (s->avg_frame_rate);
299 return av_q2d (s->r_frame_rate);
303 FFmpegDecoder::audio_channels () const
305 if (_audio_codec_context == 0) {
309 return _audio_codec_context->channels;
313 FFmpegDecoder::audio_sample_rate () const
315 if (_audio_codec_context == 0) {
319 return _audio_codec_context->sample_rate;
323 FFmpegDecoder::audio_sample_format () const
325 if (_audio_codec_context == 0) {
326 return (AVSampleFormat) 0;
329 return _audio_codec_context->sample_fmt;
333 FFmpegDecoder::audio_channel_layout () const
335 if (_audio_codec_context == 0) {
339 return _audio_codec_context->channel_layout;
343 FFmpegDecoder::native_size () const
345 return Size (_video_codec_context->width, _video_codec_context->height);
349 FFmpegDecoder::pixel_format () const
351 return _video_codec_context->pix_fmt;
355 FFmpegDecoder::time_base_numerator () const
357 return _video_codec_context->time_base.num;
361 FFmpegDecoder::time_base_denominator () const
363 return _video_codec_context->time_base.den;
367 FFmpegDecoder::sample_aspect_ratio_numerator () const
369 return _video_codec_context->sample_aspect_ratio.num;
373 FFmpegDecoder::sample_aspect_ratio_denominator () const
375 return _video_codec_context->sample_aspect_ratio.den;
379 FFmpegDecoder::has_subtitles () const
381 return (_subtitle_stream != -1);
385 FFmpegDecoder::audio_streams () const
387 return _audio_streams;
390 vector<SubtitleStream>
391 FFmpegDecoder::subtitle_streams () const
393 return _subtitle_streams;
397 FFmpegDecoder::stream_name (AVStream* s) const
401 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
406 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
408 if (!n.str().empty()) {
414 if (n.str().empty()) {