/*
    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.

*/

/** @file  test/ffmpeg_seek_test.cc
 *  @brief Test seek using Player with an FFmpegDecoder; note that the player
 *  can hide problems with FFmpegDecoder seeking as it will skip frames / insert
 *  black as it sees fit.
 */

#include <boost/test/unit_test.hpp>
#include "lib/player.h"
#include "lib/ffmpeg_decoder.h"
#include "lib/film.h"
#include "lib/ratio.h"
#include "test.h"

using std::cout;
using std::string;
using std::stringstream;
using boost::shared_ptr;
using boost::optional;

#define FFMPEG_SEEK_TEST_DEBUG 1

optional<DCPTime> first_video;
optional<DCPTime> first_audio;
shared_ptr<Film> film;

static void
process_video (shared_ptr<PlayerImage>, Eyes, ColourConversion, bool, DCPTime t)
{
	if (!first_video) {
		first_video = t;
	}
}

static void
process_audio (shared_ptr<const AudioBuffers>, DCPTime t)
{
	if (!first_audio) {
		first_audio = t;
	}
}

static string
print_time (DCPTime t, float fps)
{
	stringstream s;
	s << t << " " << (float(t) / TIME_HZ) << "s " << (float(t) * fps / TIME_HZ) << "f";
	return s.str ();
}

static void
check (shared_ptr<Player> p, DCPTime t)
{
	first_video.reset ();
	first_audio.reset ();

#if FFMPEG_SEEK_TEST_DEBUG == 1
	cout << "\n-- Seek to " << print_time (t, 24) << "\n";
#endif	
	
	p->seek (t, true);
	while (!first_video || !first_audio) {
		p->pass ();
	}

#if FFMPEG_SEEK_TEST_DEBUG == 1
	cout << "First video " << print_time (first_video.get(), 24) << "\n";
	cout << "First audio " << print_time (first_audio.get(), 24) << "\n";
#endif	

	/* Outputs should be on or after seek time */
	BOOST_CHECK (first_video.get() >= t);
	BOOST_CHECK (first_audio.get() >= t);
	/* And should be rounded to frame boundaries */
	BOOST_CHECK ((first_video.get() % (TIME_HZ / film->video_frame_rate())) == 0);
	BOOST_CHECK ((first_audio.get() % (TIME_HZ / film->audio_frame_rate())) == 0);
}

/* Test basic seeking */
BOOST_AUTO_TEST_CASE (ffmpeg_seek_test)
{
	film = new_test_film ("ffmpeg_seek_test");
	film->set_name ("ffmpeg_seek_test");
	film->set_container (Ratio::from_id ("185"));
	shared_ptr<FFmpegContent> c (new FFmpegContent (film, "test/data/staircase.mov"));
	c->set_ratio (Ratio::from_id ("185"));
	film->examine_and_add_content (c);

	wait_for_jobs ();

	shared_ptr<Player> player = film->make_player ();
	player->Video.connect (boost::bind (&process_video, _1, _2, _3, _4, _5));
	player->Audio.connect (boost::bind (&process_audio, _1, _2));

	check (player, 0);
	check (player, 0.1 * TIME_HZ);
	check (player, 0.2 * TIME_HZ);
	check (player, 0.3 * TIME_HZ);
}