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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"
#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)
{
/* 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 (audio_stream_name (s), s->id, 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 (subtitle_stream_name (s), s->id)));
}
}
/* Run through until we find the first audio (for each stream) and video */
while (1) {
int r = av_read_frame (_format_context, &_packet);
if (r < 0) {
break;
}
int frame_finished;
AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
if (_packet.stream_index == _video_stream && !_first_video) {
if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
_first_video = frame_time (_format_context->streams[_video_stream]);
}
} else {
for (size_t i = 0; i < _audio_streams.size(); ++i) {
if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index) && !_audio_streams[i]->first_audio) {
if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
_audio_streams[i]->first_audio = frame_time (_audio_streams[i]->stream (_format_context));
}
}
}
}
bool have_all_audio = true;
size_t i = 0;
while (i < _audio_streams.size() && have_all_audio) {
have_all_audio = _audio_streams[i]->first_audio;
++i;
}
av_free_packet (&_packet);
if (_first_video && have_all_audio) {
break;
}
}
}
optional<double>
FFmpegExaminer::frame_time (AVStream* s) const
{
optional<double> t;
int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
if (bet != AV_NOPTS_VALUE) {
t = bet * av_q2d (s->time_base);
}
return t;
}
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 */
VideoContent::Frame
FFmpegExaminer::video_length () const
{
VideoContent::Frame const length = (double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate();
return max (1, length);
}
string
FFmpegExaminer::audio_stream_name (AVStream* s) const
{
stringstream n;
n << stream_name (s);
if (!n.str().empty()) {
n << "; ";
}
n << s->codec->channels << " channels";
return n.str ();
}
string
FFmpegExaminer::subtitle_stream_name (AVStream* s) const
{
stringstream n;
n << stream_name (s);
if (n.str().empty()) {
n << _("unknown");
}
return n.str ();
}
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;
}
}
return n.str ();
}
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