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/*
Copyright (C) 2013 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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}
#include "ffmpeg_examiner.h"
#include "ffmpeg_content.h"
using std::string;
using std::stringstream;
using boost::shared_ptr;
FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c)
: FFmpeg (c)
{
/* Find audio and subtitle streams */
for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
AVStream* s = _format_context->streams[i];
if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
/* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
so bodge it here. No idea why we should have to do this.
*/
if (s->codec->channel_layout == 0) {
s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
}
_audio_streams.push_back (
shared_ptr<FFmpegAudioStream> (
new FFmpegAudioStream (stream_name (s), i, s->codec->sample_rate, s->codec->channels)
)
);
} else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
_subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (stream_name (s), i)));
}
}
}
float
FFmpegExaminer::video_frame_rate () const
{
AVStream* s = _format_context->streams[_video_stream];
if (s->avg_frame_rate.num && s->avg_frame_rate.den) {
return av_q2d (s->avg_frame_rate);
}
return av_q2d (s->r_frame_rate);
}
libdcp::Size
FFmpegExaminer::video_size () const
{
return libdcp::Size (_video_codec_context->width, _video_codec_context->height);
}
/** @return Length (in video frames) according to our content's header */
ContentVideoFrame
FFmpegExaminer::video_length () const
{
return (double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate();
}
string
FFmpegExaminer::stream_name (AVStream* s) const
{
stringstream n;
if (s->metadata) {
AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
if (lang) {
n << lang->value;
}
AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
if (title) {
if (!n.str().empty()) {
n << " ";
}
n << title->value;
}
}
if (n.str().empty()) {
n << "unknown";
}
return n.str ();
}
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