/*
- Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c)
: FFmpeg (c)
+ , _need_video_length (false)
{
/* Find audio and subtitle streams */
}
}
+ /* See if the header has duration information in it */
+ _need_video_length = _format_context->duration == AV_NOPTS_VALUE;
+ if (!_need_video_length) {
+ _video_length = ContentTime::from_seconds (double (_format_context->duration) / AV_TIME_BASE);
+ }
+
/* Run through until we find:
* - the first video.
* - the first audio for each stream.
void
FFmpegExaminer::video_packet (AVCodecContext* context)
{
- if (_first_video) {
+ if (_first_video && !_need_video_length) {
return;
}
int frame_finished;
if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
- _first_video = frame_time (_format_context->streams[_video_stream]);
+ if (!_first_video) {
+ _first_video = frame_time (_format_context->streams[_video_stream]);
+ }
+ if (_need_video_length) {
+ _video_length = frame_time (_format_context->streams[_video_stream]).get_value_or (ContentTime ());
+ }
}
}
FFmpegExaminer::video_length () const
{
ContentTime const length = ContentTime::from_seconds (double (_format_context->duration) / AV_TIME_BASE);
- return ContentTime (max (ContentTime::Type (1), length.get ()));
+ return ContentTime (max (ContentTime (1), _video_length));
}
optional<float>
std::vector<boost::shared_ptr<FFmpegSubtitleStream> > _subtitle_streams;
std::vector<boost::shared_ptr<FFmpegAudioStream> > _audio_streams;
boost::optional<ContentTime> _first_video;
+ /** Video length, either obtained from the header or derived by running
+ * through the whole file.
+ */
+ ContentTime _video_length;
+ bool _need_video_length;
};