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 for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
110 if (_format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
112 } else if (_format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
113 if (_audio_stream == -1) {
116 _audio_streams.push_back (Stream (stream_name (_format_context->streams[i]), i));
117 } else if (_format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
118 if (_subtitle_stream == -1) {
119 _subtitle_stream = i;
121 _subtitle_streams.push_back (Stream (stream_name (_format_context->streams[i]), i));
125 if (_video_stream < 0) {
126 throw DecodeError ("could not find video stream");
129 _frame = avcodec_alloc_frame ();
131 throw DecodeError ("could not allocate frame");
136 FFmpegDecoder::setup_video ()
138 _video_codec_context = _format_context->streams[_video_stream]->codec;
139 _video_codec = avcodec_find_decoder (_video_codec_context->codec_id);
141 if (_video_codec == 0) {
142 throw DecodeError ("could not find video decoder");
145 if (avcodec_open2 (_video_codec_context, _video_codec, 0) < 0) {
146 throw DecodeError ("could not open video decoder");
151 FFmpegDecoder::setup_audio ()
153 if (_audio_stream < 0) {
157 _audio_codec_context = _format_context->streams[_audio_stream]->codec;
158 _audio_codec = avcodec_find_decoder (_audio_codec_context->codec_id);
160 if (_audio_codec == 0) {
161 throw DecodeError ("could not find audio decoder");
164 if (avcodec_open2 (_audio_codec_context, _audio_codec, 0) < 0) {
165 throw DecodeError ("could not open audio decoder");
168 /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
169 so bodge it here. No idea why we should have to do this.
172 if (_audio_codec_context->channel_layout == 0) {
173 _audio_codec_context->channel_layout = av_get_default_channel_layout (audio_channels ());
178 FFmpegDecoder::setup_subtitle ()
180 if (_subtitle_stream < 0) {
184 _subtitle_codec_context = _format_context->streams[_subtitle_stream]->codec;
185 _subtitle_codec = avcodec_find_decoder (_subtitle_codec_context->codec_id);
187 if (_subtitle_codec == 0) {
188 throw DecodeError ("could not find subtitle decoder");
191 if (avcodec_open2 (_subtitle_codec_context, _subtitle_codec, 0) < 0) {
192 throw DecodeError ("could not open subtitle decoder");
198 FFmpegDecoder::do_pass ()
200 int r = av_read_frame (_format_context, &_packet);
202 if (r != AVERROR_EOF) {
203 throw DecodeError ("error on av_read_frame");
206 /* Get any remaining frames */
213 while (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
214 process_video (_frame);
217 if (_audio_stream >= 0 && _opt->decode_audio) {
218 while (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
219 int const data_size = av_samples_get_buffer_size (
220 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
223 assert (_audio_codec_context->channels == _fs->audio_channels());
224 process_audio (_frame->data[0], data_size);
231 if (_packet.stream_index == _video_stream) {
234 if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
235 process_video (_frame);
238 } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio) {
240 avcodec_get_frame_defaults (_frame);
243 if (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
244 int const data_size = av_samples_get_buffer_size (
245 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
248 assert (_audio_codec_context->channels == _fs->audio_channels());
249 process_audio (_frame->data[0], data_size);
252 } else if (_subtitle_stream >= 0 && _packet.stream_index == _subtitle_stream && _opt->decode_subtitles) {
256 if (avcodec_decode_subtitle2 (_subtitle_codec_context, &sub, &got_subtitle, &_packet) && got_subtitle) {
257 /* I'm not entirely sure why, but sometimes we get an AVSubtitle with
260 if (sub.num_rects > 0) {
261 process_subtitle (shared_ptr<TimedSubtitle> (new TimedSubtitle (sub)));
263 avsubtitle_free (&sub);
267 av_free_packet (&_packet);
272 FFmpegDecoder::length_in_frames () const
274 return (_format_context->duration / AV_TIME_BASE) * frames_per_second ();
278 FFmpegDecoder::frames_per_second () const
280 AVStream* s = _format_context->streams[_video_stream];
282 if (s->avg_frame_rate.num && s->avg_frame_rate.den) {
283 return av_q2d (s->avg_frame_rate);
286 return av_q2d (s->r_frame_rate);
290 FFmpegDecoder::audio_channels () const
292 if (_audio_codec_context == 0) {
296 return _audio_codec_context->channels;
300 FFmpegDecoder::audio_sample_rate () const
302 if (_audio_codec_context == 0) {
306 return _audio_codec_context->sample_rate;
310 FFmpegDecoder::audio_sample_format () const
312 if (_audio_codec_context == 0) {
313 return (AVSampleFormat) 0;
316 return _audio_codec_context->sample_fmt;
320 FFmpegDecoder::audio_channel_layout () const
322 if (_audio_codec_context == 0) {
326 return _audio_codec_context->channel_layout;
330 FFmpegDecoder::native_size () const
332 return Size (_video_codec_context->width, _video_codec_context->height);
336 FFmpegDecoder::pixel_format () const
338 return _video_codec_context->pix_fmt;
342 FFmpegDecoder::time_base_numerator () const
344 return _video_codec_context->time_base.num;
348 FFmpegDecoder::time_base_denominator () const
350 return _video_codec_context->time_base.den;
354 FFmpegDecoder::sample_aspect_ratio_numerator () const
356 return _video_codec_context->sample_aspect_ratio.num;
360 FFmpegDecoder::sample_aspect_ratio_denominator () const
362 return _video_codec_context->sample_aspect_ratio.den;
366 FFmpegDecoder::has_subtitles () const
368 return (_subtitle_stream != -1);
372 FFmpegDecoder::audio_streams () const
374 return _audio_streams;
378 FFmpegDecoder::subtitle_streams () const
380 return _subtitle_streams;
384 FFmpegDecoder::set_audio_stream (int s)
391 FFmpegDecoder::set_subtitle_stream (int s)
393 _subtitle_stream = s;
398 FFmpegDecoder::stream_name (AVStream* s) const
402 AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
407 AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
409 if (!n.str().empty()) {
415 if (n.str().empty()) {