/*
    Copyright (C) 2012 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.

*/

#include <iostream>
#include <sndfile.h>
#include "sndfile_content.h"
#include "sndfile_decoder.h"
#include "film.h"
#include "exceptions.h"

#include "i18n.h"

using std::vector;
using std::string;
using std::min;
using std::cout;
using boost::shared_ptr;

SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
	: Decoder (f)
	, AudioDecoder (f)
	, _sndfile_content (c)
{
	_sndfile = sf_open (_sndfile_content->file().string().c_str(), SFM_READ, &_info);
	if (!_sndfile) {
		throw DecodeError (_("could not open audio file for reading"));
	}

	_done = 0;
	_remaining = _info.frames;
}

SndfileDecoder::~SndfileDecoder ()
{
	if (_sndfile) {
		sf_close (_sndfile);
	}
}

bool
SndfileDecoder::pass ()
{
	/* Do things in half second blocks as I think there may be limits
	   to what FFmpeg (and in particular the resampler) can cope with.
	*/
	sf_count_t const block = _sndfile_content->audio_frame_rate() / 2;
	sf_count_t const this_time = min (block, _remaining);
	
	shared_ptr<AudioBuffers> audio (new AudioBuffers (_sndfile_content->audio_channels(), this_time));
	sf_read_float (_sndfile, audio->data(0), this_time);
	audio->set_frames (this_time);
	Audio (audio, double(_done) / audio_frame_rate());
	_done += this_time;
	_remaining -= this_time;

	return (_remaining == 0);
}

int
SndfileDecoder::audio_channels () const
{
	return _info.channels;
}

ContentAudioFrame
SndfileDecoder::audio_length () const
{
	return _info.frames;
}

int
SndfileDecoder::audio_frame_rate () const
{
	return _info.samplerate;
}