/*
- 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
#include "ffmpeg_audio_stream.h"
#include "ffmpeg_subtitle_stream.h"
#include "util.h"
+#include "safe_stringstream.h"
#include "i18n.h"
using std::string;
using std::cout;
using std::max;
-using std::stringstream;
using boost::shared_ptr;
using boost::optional;
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 ());
+ }
}
}
return t;
}
-float
+optional<float>
FFmpegExaminer::video_frame_rate () const
{
/* This use of r_frame_rate is debateable; there's a few different
ContentTime
FFmpegExaminer::video_length () const
{
- ContentTime const length = ContentTime::from_seconds (double (_format_context->duration - _format_context->start_time) / AV_TIME_BASE);
- return ContentTime (max (int64_t (1), length.get ()));
+ ContentTime const length = ContentTime::from_seconds (double (_format_context->duration) / AV_TIME_BASE);
+ return ContentTime (max (ContentTime (1), _video_length));
+}
+
+optional<float>
+FFmpegExaminer::sample_aspect_ratio () const
+{
+ AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream], 0);
+ if (sar.num == 0) {
+ /* I assume this means that we don't know */
+ return optional<float> ();
+ }
+ return float (sar.num) / sar.den;
}
string
FFmpegExaminer::audio_stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
n << stream_name (s);
string
FFmpegExaminer::subtitle_stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
n << stream_name (s);
string
FFmpegExaminer::stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
if (s->metadata) {
AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);