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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            wavfile.cc
 *
 *  Mi 20. Jan 16:57:16 CET 2016
 *  Copyright 2016 Christian Glöckner
 *  cgloeckner@freenet.de
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "wavfile.h"

WavfileOutputEngine::WavfileOutputEngine()
	: info{}
	, channels{}
	, file{"output"} {
	info.frames = 0;
	info.samplerate = 44100;
	info.channels = 1;
	info.format = SF_FORMAT_WAV | SF_FORMAT_FLOAT;
	info.sections = 0;
	info.seekable = 0;
}

WavfileOutputEngine::~WavfileOutputEngine() {
	for (auto& ptr: channels) {
		if (ptr != nullptr) {
			sf_close(ptr);
		}
	}
}

bool WavfileOutputEngine::init(Channels data) {
	channels.clear(),
	channels.resize(data.size()); // value-initialized with null
	for (auto i = 0u; i < data.size(); ++i) {
		// write channel to file
		auto fname = file + data[i].name + "-" + std::to_string(i) + ".wav";
		channels[i] = sf_open(fname.c_str(), SFM_WRITE, &info);
		if (channels[i] == nullptr) {
			printf("Write error...\n");
			return false;
		}
	}
	return true;
}

void WavfileOutputEngine::setParm(std::string parm, std::string value) {
	if (parm == "file") {
		file = value;
	} else if (parm == "srate") {
		info.samplerate = std::stoi(value);
	} else {
		printf("Unsupported wavfile parameter '%s'\n", parm.c_str());
	}
}

bool WavfileOutputEngine::start() {
	return true;
}

void WavfileOutputEngine::stop() {
}

void WavfileOutputEngine::pre(size_t nsamples) {
}

void WavfileOutputEngine::run(int ch, sample_t* samples, size_t nsamples) {
	if (static_cast<unsigned int>(ch) >= channels.size()) {
		printf("Invalid channel %d (%lu channels available)", ch, channels.size());
		return;
	}
	
	sf_writef_float(channels[ch], samples, nsamples);
}

void WavfileOutputEngine::post(size_t nsamples) {
}

size_t WavfileOutputEngine::samplerate() {
	return info.samplerate;
}